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ORCA-C/Scanner.pas
Stephen Heumann 2d6ae52d32 Fix bug where a preprocessing directive could be mis-evaluated if it occurred immediately after a use of a function-like macro. 
This occurred because the code to handle the function-like macro use would read the following token, which could prompt processing of the following preprocessing directive in an inappropriate context.

The following example illustrates the problem (the error message would be printed):

#define A()
#define FOO 1
A()
#if !FOO
# error "shouldn't get here"
#endif
2017-10-21 20:36:20 -05:00

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{$optimize 7}
{---------------------------------------------------------------}
{ }
{ Scanner }
{ }
{ External Variables: }
{ }
{ ch - next character to process }
{ printMacroExpansions - print the token list? }
{ reportEOL - report eolsy as a token? }
{ token - next token to process }
{ }
{ External Subroutines: }
{ }
{ Error - flag an error }
{ IsDefined - see if a macro name is in the macro table }
{ InitScanner - initialize the scanner }
{ NextCh - Read the next character from the file, skipping }
{ comments. }
{ NextToken - read the next token from the file }
{ PutBackToken - place a token into the token stream }
{ TermScanner - Shut down the scanner. }
{ }
{---------------------------------------------------------------}
unit Scanner;
interface
{$LibPrefix '0/obj/'}
uses CCommon, Table, CGI, MM;
{$segment 'scanner'}
type
pragmas = {kinds of pragmas}
(p_startofenum,p_cda,p_cdev,p_float,p_keep,
p_nda,p_debug,p_lint,p_memorymodel,p_expand,
p_optimize,p_stacksize,p_toolparms,p_databank,p_rtl,
p_noroot,p_path,p_ignore,p_segment,p_nba,
p_xcmd,p_unix,p_line,p_endofenum);
{preprocessor types}
{------------------}
tokenListRecordPtr = ^tokenListRecord;
tokenListRecord = record {element of a list of tokens}
next: tokenListRecordPtr; {next element in list}
tokenString: longStringPtr; {string making up the token}
token: tokenType; {token}
expandEnabled: boolean; {can this token be macro expanded?}
tokenStart,tokenEnd: ptr; {token start/end markers}
end;
macroRecordPtr = ^macroRecord;
macroRecord = record {preprocessor macro definition}
next: macroRecordPtr;
saved: boolean;
name: stringPtr;
parameters: integer;
tokens: tokenListRecordPtr;
readOnly: boolean;
algorithm: integer;
end;
macroTable = array[0..hashSize] of macroRecordPtr; {preprocessor macro list}
{path name lists}
{---------------}
pathRecordPtr = ^pathRecord;
pathRecord = record
next: pathRecordPtr;
path: stringPtr;
end;
var
ch: char; {next character to process}
macros: ^macroTable; {preprocessor macro list}
pathList: pathRecordPtr; {additional search paths}
printMacroExpansions: boolean; {print the token list?}
reportEOL: boolean; {report eolsy as a token?}
skipIllegalTokens: boolean; {skip flagging illegal tokens in skipped code?}
slashSlashComments: boolean; {allow // comments?}
token: tokenType; {next token to process}
{---------------------------------------------------------------}
procedure DoDefaultsDotH;
{ Handle the defaults.h file }
procedure Error (err: integer);
{ flag an error }
{ }
{ err - error number }
{procedure Error2 (loc, err: integer); {debug}
{ flag an error }
{ }
{ loc - error location }
{ err - error number }
procedure InitScanner (start, endPtr: ptr);
{ initialize the scanner }
{ }
{ start - pointer to the first character in the file }
{ endPtr - points one byte past the last character in the file }
function IsDefined (name: stringPtr): boolean;
{ See if a macro name is in the macro table }
{ }
{ The returned value is true if the macro exists, else false. }
{ }
{ parameters: }
{ name - name of the macro to search for }
procedure NextCh; extern;
{ Read the next character from the file, skipping comments. }
{ }
{ Globals: }
{ ch - character read }
procedure NextToken;
{ Read the next token from the file. }
procedure PutBackToken (var token: tokenType; expandEnabled: boolean);
{ place a token into the token stream }
{ }
{ parameters: }
{ token - token to put back into the token stream }
{ expandEnabled - can macro expansion be performed? }
procedure TermScanner;
{ Shut down the scanner. }
{---------------------------------------------------------------}
implementation
const
{special key values}
{------------------}
BS = 8; {backspace}
FF = 12; {form feed}
HT = 9; {horizontal tab}
NEWLINE = 10; {newline}
RETURN = 13; {RETURN key code}
VT = 11; {vertical tab}
{misc}
{----}
defaultName = '13:ORCACDefs:Defaults.h'; {default include file name}
maxErr = 10; {max errors on one line}
type
errorType = record {record of a single error}
num: integer; {error number}
line: integer; {line number}
col: integer; {column number}
end;
{file inclusion}
{--------------}
filePtr = ^fileRecord;
fileRecord = record {NOTE: used in scanner.asm}
next: filePtr; {next file in include stack}
name: gsosOutString; {name of the file}
sname: gsosOutString; {name of the file for __FILE__}
lineNumber: integer; {line number at the #include}
disp: longint; {disp of next character to process}
end;
getFileInfoOSDCB = record
pcount: integer;
pathName: gsosInStringPtr;
access: integer;
fileType: integer;
auxType: longint;
storageType: integer;
createDateTime: timeField;
modDateTime: timeField;
optionList: optionListPtr;
dataEOF: longint;
blocksUsed: longint;
resourceEOF: longint;
resourceBlocks: longint;
end;
expandDevicesDCBGS = record
pcount: integer;
inName: gsosInStringPtr;
outName: gsosOutStringPtr;
end;
{conditional compilation parsing}
{-------------------------------}
ifPtr = ^ifRecord;
ifRecord = record
next: ifPtr; {next record in if stack}
status: {what are we doing?}
(processing,skippingToEndif,skippingToElse);
elseFound: boolean; {has an #else been found?}
end;
var
dateStr: longStringPtr; {macro date string}
doingstring: boolean; {used to supress comments in strings}
errors: array[1..maxErr] of errorType; {errors in this line}
eofPtr: ptr; {points one byte past the last char in the file}
fileList: filePtr; {include file list}
flagOverflows: boolean; {flag numeric overflows?}
gettingFileName: boolean; {are we in GetFileName?}
lastWasReturn: boolean; {was the last character an eol?}
lineStr: string[5]; {string form of __LINE__}
ifList: ifPtr; {points to the top prep. parse record}
includeChPtr: ptr; {chPtr at start of current token}
includeCount: 0..maxint; {nested include files (for EndInclude)}
macroFound: macroRecordPtr; {last macro found by IsDefined}
needWriteLine: boolean; {is there a line that needs to be written?}
numErr: 0..maxErr; {number of errors in this line}
oneStr: string[2]; {string form of __STDC__}
ispstring: boolean; {is the current string a p-string?}
saveNumber: boolean; {save the characters in a number?}
skipping: boolean; {skipping tokens?}
timeStr: longStringPtr; {macro time string}
tokenColumn: 0..maxint; {column number at start of this token}
tokenLine: 0..maxint; {line number at start of this token}
tokenList: tokenListRecordPtr; {token putback buffer}
tokenStart: ptr; {pointer to the first char in the token}
tokenEnd: ptr; {pointer to the first char past the token}
versionStrL: longStringPtr; {macro version string}
workString: pstring; {for building strings and identifiers}
{-- External procedures; see expresssion evaluator for notes ---}
procedure EndInclude (chPtr: ptr); extern;
{ Saves symbols created by the include file }
{ }
{ Parameters: }
{ chPtr - chPtr when the file returned }
{ }
{ Notes: }
{ 1. Call this subroutine right after processing an }
{ include file. }
{ 2. Fron Header.pas }
procedure ExpandDevicesGS (var parms: expandDevicesDCBGS); prodos ($0154);
procedure Expression (kind: expressionKind; stopSym: tokenSet); extern;
{ handle an expression }
function FindSymbol (var tk: tokenType; class: spaceType; oneLevel: boolean;
staticAllowed: boolean): identPtr; extern;
{ locate a symbol in the symbol table }
{ }
{ parameters: }
{ tk - token record for the identifier to find }
{ class - the kind of variable space to search }
{ oneLevel - search one level only? (used to check for }
{ duplicate symbols) }
{ staticAllowed - can we check for static variables? }
{ }
{ returns: }
{ A pointer to the symbol table entry is returned. If }
{ there is no entry, nil is returned. }
procedure FlagPragmas (pragma: pragmas); extern;
{ record the effects of a pragma }
{ }
{ parameters: }
{ pragma - pragma to record }
{ }
{ Notes: }
{ 1. From Header.pas }
procedure GetFileInfoGS (var parms: getFileInfoOSDCB); prodos ($2006);
procedure StartInclude (name: gsosOutStringPtr); extern;
{ Marks the start of an include file }
{ }
{ Notes: }
{ 1. Call this subroutine right after opening an include }
{ file. }
{ 2. From Header.pas }
{-- Scanner support --------------------------------------------}
procedure CheckDelimiters (var name: pString);
{ Check for delimiters, making sure they are ':' }
{ }
{ parameters: }
{ name - path name to check }
label 1;
var
dc: char; {delimiter character}
i: 0..255; {loop/index variable}
begin {CheckDelimiters}
dc := ':'; {determine what the delimiter is}
for i := 1 to length(name) do
if name[i] in [':','/'] then begin
dc := name[i];
goto 1;
end; {if}
1: ;
if dc = '/' then {replace '/' delimiters with ':'}
for i := 1 to length(name) do
if name[i] = '/' then
name[i] := ':';
end; {CheckDelimiters}
procedure AddPath (name: pString);
{ Add a path name to the path name table }
{ }
{ parameters: }
{ name - path name to add }
var
pp, ppe: pathRecordPtr; {work pointers}
begin {AddPath}
if length(name) <> 0 then begin
CheckDelimiters(name); {make sure ':' is used}
if name[length(name)] <> ':' then {make sure there is a trailing delimiter}
name := concat(name, ':');
{create the new path record}
pp := pathRecordPtr(GMalloc(sizeof(pathRecord)));
pp^.next := nil;
pp^.path := stringPtr(GMalloc(length(name)+1));
pp^.path^ := name;
if pathList = nil then {add the path to the path list}
pathList := pp
else begin
ppe := pathList;
while ppe^.next <> nil do
ppe := ppe^.next;
ppe^.next := pp;
end; {else}
end; {if}
end; {AddPath}
function Convertsl(var str: pString): longint; extern;
{ Return the integer equivalent of the string. Assumes a valid }
{ 4-byte integer string; supporst unsigned values. }
procedure SetDateTime; extern;
{ set up the macro date/time strings }
function KeyPress: boolean; extern;
{ Has a key been presed? }
{ }
{ If a key has not been pressed, this function returns }
{ false. If a key has been pressed, it clears the key }
{ strobe. If the key was an open-apple ., a terminal exit }
{ is performed; otherwise, the function returns true. }
function IsDefined {name: stringPtr): boolean};
{ See if a macro name is in the macro table }
{ }
{ The returned value is true if the macro exists, else false. }
{ }
{ parameters: }
{ name - name of the macro to search for }
{ }
{ outputs: }
{ macroFound - pointer to the macro found }
label 1;
var
bPtr: ^macroRecordPtr; {pointer to hash bucket}
mPtr: macroRecordPtr; {for checking list of macros}
begin {IsDefined}
IsDefined := false;
bPtr := pointer(ord4(macros) + Hash(name));
mPtr := bPtr^;
while mPtr <> nil do begin
if mPtr^.name^ = name^ then begin
IsDefined := true;
goto 1;
end; {if}
mPtr := mPtr^.next;
end; {while}
1:
macroFound := mPtr;
end; {IsDefined}
procedure PutBackToken {var token: tokenType; expandEnabled: boolean};
{ place a token into the token stream }
{ }
{ parameters: }
{ token - token to put back into the token stream }
{ expandEnabled - can macro expansion be performed? }
var
tPtr: tokenListRecordPtr; {work pointer}
begin {PutBackToken}
new(tPtr);
tPtr^.next := tokenList;
tokenList := tPtr;
tPtr^.token := token;
tPtr^.expandEnabled := expandEnabled;
tPtr^.tokenStart := tokenStart;
tPtr^.tokenEnd := tokenEnd;
end; {PutBackToken}
procedure WriteLine;
{ Write the current character to the screen. }
{ }
{ Global Variables: }
{ firstPtr - points to the first char in the line }
{ chPtr - points to the end of line character }
var
cl: 0..maxint; {column number loop index}
cp: ptr; {work pointer}
i: 1..maxErr; {error loop index}
msg: stringPtr; {pointer to the error message}
begin {WriteLine}
if list or (numErr <> 0) then begin
write(lineNumber:4, ' '); {write the line #}
cp := firstPtr; {write the characters in the line}
while cp <> chPtr do begin
if cp^ <> RETURN then
write(chr(cp^));
cp := pointer(ord4(cp) + 1);
end; {while}
writeln; {write the end of line character}
for i := 1 to numErr do {write any errors}
with errors[i] do begin
if line = lineNumber then begin
for cl := 1 to col+4 do
write(' ');
write('^ ');
end {if}
else
write(' Error in column ', col:1, ' of line ', line:1, ': ');
case num of
1 : msg := @'illegal character';
2 : msg := @'a character constant must contain exactly one character';
3 : msg := @'no end was found to the string';
4 : msg := @'further errors suppressed';
5 : msg := @'cannot redefine a macro';
6 : msg := @'integer overflow';
7 : msg := @'''8'' and ''9'' cannot be used in octal constants';
8 : msg := @'unknown preprocessor command';
9 : msg := @'identifier expected';
10: msg := @'cannot undefine standard macros';
11: msg := @'end of line expected';
12: msg := @''')'' expected';
13: msg := @'''('' expected';
14: msg := @'incorrect number of macro parameters';
15: msg := @'''>'' expected';
16: msg := @'file name is too long';
17: msg := @'keep must appear before any functions';
18: msg := @'integer constant expected';
19: msg := @'only one #else may be used per #if';
20: msg := @'there is no #if for this directive';
21: msg := @'an #if had no closing #endif';
22: msg := @''';'' expected';
23: msg := @'''}'' expected';
24: msg := @''']'' expected';
25: msg := @'the else has no matching if';
26: msg := @'type expected';
27: msg := @'''{'' expected';
28: msg := @'a function cannot be defined here';
29: msg := @''':'' expected';
30: msg := @'''while'' expected';
31: msg := @'undeclared identifier';
32: msg := @'the last if statement was not finished';
33: msg := @'the last do statement was not finished';
34: msg := @'the last compound statement was not finished';
35: msg := @'expression expected';
36: msg := @'expression syntax error';
37: msg := @'operand expected';
38: msg := @'operation expected';
39: msg := @'no matching ''?'' found for this '':'' operator';
40: msg := @'illegal type cast';
41: msg := @'illegal operand in a constant expression';
42: msg := @'duplicate symbol';
43: msg := @'the function''s type must match the previous declaration';
44: msg := @'too many initializers';
45: msg := @'the number of array elements must be greater than 0';
46: msg := @'you must initialize the individual elements of a struct, union, or non-char array';
47: msg := @'type conflict';
48: msg := @'pointer initializers must resolve to an integer, address or string';
49: msg := @'the array size could not be determined';
50: msg := @'only parameters or types may be declared here';
51: msg := @'lint: undefined function';
52: msg := @'you cannot initialize a type';
53: msg := @'the structure has already been defined';
54: msg := @'bit fields must be less than 32 bits wide';
55: msg := @'a value cannot be zero bits wide';
56: msg := @'unions cannot have bit fields';
57: msg := @'compiler error';
58: msg := @'implementation restriction: too many local labels';
59: msg := @'file name expected';
60: msg := @'implementation restriction: string space exhausted';
61: msg := @'implementation restriction: run-time stack space exhausted';
62: msg := @'auto or register can only be used in a function body';
63: msg := @'token merging produced an illegal token';
64: msg := @'assignment to an array is not allowed';
65: msg := @'assignment to void is not allowed';
66: msg := @'the operation cannot be performed on operands of the type given';
67: msg := @'the last else clause was not finished';
68: msg := @'the last while statement was not finished';
69: msg := @'the last for statement was not finished';
70: msg := @'the last switch statement was not finished';
71: msg := @'switch expressions must evaluate to integers';
72: msg := @'case and default labels must appear in a switch statement';
73: msg := @'duplicate case label';
74: msg := @'only one default label is allowed in a switch statement';
75: msg := @'continue must appear in a while, do or for loop';
76: msg := @'break must appear in a while, do, for or switch statement';
77: msg := @'duplicate label';
78: msg := @'l-value required';
79: msg := @'illegal operand for the indirection operator';
80: msg := @'the selection operator must be used on a structure or union';
81: msg := @'the selected field does not exist in the structure or union';
82: msg := @'''('', ''['' or ''*'' expected';
83: msg := @'string constant expected';
84: msg := @'''dynamic'' expected';
85: msg := @'the number of parameters does not agree with the prototype';
86: msg := @''','' expected';
87: msg := @'invalid storage type for a parameter';
88: msg := @'you cannot initialize a parameter';
89: msg := @'''.'' expected';
90: msg := @'string too long';
91: msg := @'real constants cannot be unsigned';
92: msg := @'statement expected';
93: msg := @'assignment to const is not allowed';
94: msg := @'pascal qualifier is only allowed on functions';
95: msg := @'unidentified operation code';
96: msg := @'incorrect operand size';
97: msg := @'operand syntax error';
98: msg := @'invalid operand';
99: msg := @'comp data type is not supported by the 68881';
100: msg := @'integer constants cannot use the f designator';
101: msg := @'digits expected in the exponent';
{102: msg := @'extern variables cannot be initialized';}
103: msg := @'functions cannot return functions or arrays';
104: msg := @'lint: missing function type';
105: msg := @'lint: parameter list not prototyped';
106: msg := @'cannot take the address of a bit field';
107: msg := @'illegal use of forward declaration';
108: msg := @'unknown cc= option on command line';
109: msg := @'illegal math operation in a constant expression';
110: msg := @'lint: unknown pragma';
111: msg := @'the & operator cannot be applied to arrays';
112: msg := @'segment buffer overflow';
113: msg := @'all parameters must have a name';
114: msg := @'a function call was made to a non-function';
otherwise: Error(57);
end; {case}
writeln(msg^);
if terminalErrors then begin
if enterEditor then
ExitToEditor(msg, ord4(firstPtr)+col-ord4(bofPtr)-1)
else
TermError(0);
end; {if}
end; {with}
{handle pauses}
if ((numErr <> 0) and wait) or KeyPress then begin
DrawHourglass;
while not KeyPress do {nothing};
ClearHourglass;
end; {if}
numErr := 0; {no errors on next line...}
end {if}
else
if KeyPress then begin {handle pauses}
DrawHourglass;
while not KeyPress do {nothing};
ClearHourglass;
end; {if}
Spin; {twirl the spinner}
end; {WriteLine}
procedure PrintToken (token: tokenType);
{ Write a token to standard out }
{ }
{ parameters: }
{ token - token to print }
label 1;
var
ch: char; {work character}
i: integer; {loop counter}
procedure PrintHexDigit(i: integer);
{ Print a digit as a hex character }
{ }
{ Parameters: }
{ i: value to print in least significant 4 bits }
begin {PrintHexDigit}
i := i & $000F;
if i < 10 then
write(chr(i | ord('0')))
else
write(chr(i + ord('A') - 10));
end; {PrintHexDigit}
begin {PrintToken}
case token.kind of
typedef,
ident: write(token.name^);
intconst,
uintconst: write(token.ival:1);
longConst,
ulongConst: write(token.lval:1);
doubleConst: write(token.rval:1);
stringConst: begin
write('"');
for i := 1 to token.sval^.length do begin
ch := token.sval^.str[i];
if ch in [' '..'~'] then
write(ch)
else begin
write('\x0');
PrintHexDigit(ord(ch)>>4);
PrintHexDigit(ord(ch));
end; {else}
end; {for}
write('"');
end;
autosy,asmsy,breaksy,casesy,charsy,
continuesy,constsy,compsy,defaultsy,dosy,
doublesy,elsesy,enumsy,externsy,extendedsy,
floatsy,forsy,gotosy,ifsy,intsy,
inlinesy,longsy,pascalsy,registersy,returnsy,
shortsy,sizeofsy,staticsy,structsy,switchsy,
segmentsy,signedsy,typedefsy,unionsy,unsignedsy,
voidsy,volatilesy,whilesy:
write(reservedWords[token.kind]);
tildech,questionch,lparench,rparench,lbrackch,rbrackch,lbracech,
rbracech,commach,semicolonch,colonch,poundch:
begin
for i := minChar to maxChar do
if charSym[i] = token.kind then begin
write(chr(i));
goto 1;
end; {if}
end;
minusch: write('-');
plusch: write('+');
ltch: write('<');
gtch: write('>');
eqch: write('=');
excch: write('!');
andch: write('&');
barch: write('|');
percentch: write('%');
carotch: write('^');
asteriskch: write('*');
slashch: write('/');
dotch: write('.');
minusgtop: write('->');
opplusplus,
plusplusop: write('++');
opminusminus,
minusminusop: write('--');
ltltop: write('<<');
gtgtop: write('>>');
lteqop: write('<=');
gteqop: write('>=');
eqeqop: write('==');
exceqop: write('!=');
andandop: write('&&');
barbarop: write('||');
pluseqop: write('+=');
minuseqop: write('-=');
asteriskeqop: write('*=');
slasheqop: write('/=');
percenteqop: write('%=');
ltlteqop: write('<<=');
gtgteqop: write('>>=');
andeqop: write('&=');
caroteqop: write('^=');
bareqop: write('!=');
uminus: write('-');
uand: write('+');
uasterisk: write('*');
macroParm: write('$', token.pnum:1);
poundpoundop,
parameteroper,
castoper,
eolsy,
eofsy: ;
end; {case}
1:
write(' ');
end; {PrintToken}
{ copy 'Scanner.debug'} {debug}
{-- The Preprocessor -------------------------------------------}
procedure CheckIdentifier; forward;
{ See if an identifier is a reserved word, macro or typedef }
procedure DoNumber (scanWork: boolean); forward;
{ The current character starts a number - scan it }
{ }
{ Parameters: }
{ scanWork - get characters from workString? }
{ }
{ Globals: }
{ ch - first character in sequence; set to first char }
{ after sequence }
{ workString - string to take numbers from }
function GetFileType (var name: pString): integer; forward;
{ Checks to see if a file exists }
{ }
{ parameters: }
{ name - file name to check for }
{ }
{ Returns: File type if the file exists, or -1 if the file does }
{ not exist (or if GetFileInfo returns an error) }
function OpenFile (doInclude, default: boolean): boolean; forward;
{ Open a new file and start scanning it }
{ }
{ Parameters: }
{ doInclude - are we doing a #include? }
{ default - use the name <defaults.h>? }
{ }
{ Returns: result from GetFileName }
function FindMacro (name: stringPtr): macroRecordPtr;
{ If the current token is a macro, find the macro table entry }
{ }
{ Parameters: }
{ name - name of the suspected macro }
{ }
{ Returns: }
{ Pointer to macro table entry; nil for none }
label 1;
var
bPtr: ^macroRecordPtr; {pointer to hash bucket}
mPtr: macroRecordPtr; {pointer to macro entry}
begin {FindMacro}
FindMacro := nil;
bPtr := pointer(ord4(macros)+Hash(name));
mPtr := bPtr^;
while mPtr <> nil do begin
if mPtr^.name^ = name^ then begin
if mPtr^.parameters = -1 then
FindMacro := mPtr
else if tokenList = nil then begin
while charKinds[ord(ch)] in [ch_white, ch_eol] do begin
if printMacroExpansions then
if charKinds[ord(ch)] = ch_eol then
writeln
else
write(ch);
NextCh;
end; {while}
if ch = '(' then
FindMacro := mPtr;
end {else if}
else if tokenList^.token.kind = lparench then
FindMacro := mPtr;
goto 1;
end; {if}
mPtr := mPtr^.next;
end; {while}
1:
end; {FindMacro}
procedure LongToPString (pstr: stringPtr; lstr: longStringPtr);
{ Convert a long string into a p string }
{ }
{ Parameters: }
{ pstr - pointer to the p-string }
{ lstr - pointer to the long string }
var
i: integer; {loop variable}
len: integer; {string length}
begin {LongToPString}
len := lstr^.length;
if len > 255 then
len := 255;
pstr^[0] := chr(len);
for i := 1 to len do
pstr^[i] := lstr^.str[i];
end; {LongToPString}
procedure Merge (var tk1: tokenType; tk2: tokenType);
{ Merge two tokens }
{ }
{ Parameters: }
{ tk1 - first token; result is stored here }
{ tk2 - second token }
label 1;
var
class1,class2: tokenClass; {token classes}
cp: longstringPtr; {pointer to work string}
i: integer; {loop variable}
kind1,kind2: tokenEnum; {token kinds}
len,len1: integer; {length of strings}
lt: tokenType; {local copy of token}
str1,str2: stringPtr; {identifier strings}
begin {Merge}
kind1 := tk1.kind;
class1 := tk1.class;
kind2 := tk2.kind;
class2 := tk2.class;
if class1 in [identifier,reservedWord] then begin
if class1 = identifier then
str1 := tk1.name
else
str1 := @reservedWords[kind1];
if class2 = identifier then
str2 := tk2.name
else if class2 = reservedWord then
str2 := @reservedWords[kind2]
else if class2 in [intConstant,longConstant,doubleConstant] then
str2 := tk2.numString
else begin
Error(63);
goto 1;
end; {else}
workString := concat(str1^, str2^);
for i := 1 to length(workString) do
if not (charKinds[ord(workString[i])] in [letter,digit]) then begin
Error(63);
goto 1;
end; {if}
lt := token;
token.kind := ident;
token.class := identifier;
token.numString := nil;
token.name := @workString;
token.symbolPtr := nil;
CheckIdentifier;
tk1 := token;
token := lt;
goto 1;
end {class1 in [identifier,reservedWord]}
else if class1 in [intConstant,longConstant,doubleConstant] then begin
if class2 in [intConstant,longConstant,doubleConstant] then
str2 := tk2.numString
else if class2 = identifier then
str2 := tk2.name
else if class2 = reservedWord then
str2 := @reservedWords[kind2]
else if kind2 = dotch then
str2 := @'.'
else begin
Error(63);
goto 1;
end; {else}
workString := concat(tk1.numString^, str2^);
lt := token;
DoNumber(true);
tk1 := token;
token := lt;
goto 1;
end {else if class1 in [intConstant,longConstant,doubleConstant]}
else if class1 = stringConstant then begin
if class2 = stringConstant then begin
len1 := tk1.sval^.length;
len := len1+tk2.sval^.length;
cp := pointer(Malloc(len+2));
for i := 1 to len1 do
cp^.str[i] := tk1.sval^.str[i];
for i := 1 to len-len1 do
cp^.str[i+len1] := tk2.sval^.str[i];
cp^.length := len;
if tk1.ispstring then
cp^.str[1] := chr(len-1);
tk1.sval := cp;
goto 1;
end; {if}
end {else if}
else if kind1 = dotch then begin
if class2 in [intConstant,longConstant,doubleConstant] then begin
workString := concat(tk1.numString^, tk2.numString^);
lt := token;
DoNumber(true);
tk1 := token;
token := lt;
goto 1;
end; {if}
end {else if class1 in [intConstant,longConstant,doubleConstant]}
else if kind1 = poundch then begin
if kind2 = poundch then begin
tk1.kind := poundpoundop;
goto 1;
end; {if}
end {else if}
else if kind1 = minusch then begin
if kind2 = gtch then begin
tk1.kind := minusgtop;
goto 1;
end {if}
else if kind2 = minusch then begin
tk1.kind := minusminusop;
goto 1;
end {else if}
else if kind2 = eqch then begin
tk1.kind := minuseqop;
goto 1;
end; {else if}
end {else if}
else if kind1 = plusch then begin
if kind2 = plusch then begin
tk1.kind := plusplusop;
goto 1;
end {else if}
else if kind2 = eqch then begin
tk1.kind := pluseqop;
goto 1;
end; {else if}
end {else if}
else if kind1 = ltch then begin
if kind2 = ltch then begin
tk1.kind := ltltop;
goto 1;
end {if}
else if kind2 = lteqop then begin
tk1.kind := ltlteqop;
goto 1;
end {else if}
else if kind2 = eqch then begin
tk1.kind := lteqop;
goto 1;
end; {else if}
end {else if}
else if kind1 = ltltop then begin
if kind2 = eqch then begin
tk1.kind := ltlteqop;
goto 1;
end; {if}
end {else if}
else if kind1 = gtch then begin
if kind2 = gtch then begin
tk1.kind := gtgtop;
goto 1;
end {if}
else if kind2 = gteqop then begin
tk1.kind := gtgteqop;
goto 1;
end {else if}
else if kind2 = eqch then begin
tk1.kind := gteqop;
goto 1;
end; {else if}
end {else if}
else if kind1 = gtgtop then begin
if kind2 = eqch then begin
tk1.kind := gtgteqop;
goto 1;
end; {if}
end {else if}
else if kind1 = eqch then begin
if kind2 = eqch then begin
tk1.kind := eqeqop;
goto 1;
end; {if}
end {else if}
else if kind1 = excch then begin
if kind2 = eqch then begin
tk1.kind := exceqop;
goto 1;
end; {if}
end {else if}
else if kind1 = andch then begin
if kind2 = andch then begin
tk1.kind := andandop;
goto 1;
end {if}
else if kind2 = eqch then begin
tk1.kind := andeqop;
goto 1;
end; {else if}
end {else if}
else if kind1 = barch then begin
if kind2 = barch then begin
tk1.kind := barbarop;
goto 1;
end {if}
else if kind2 = eqch then begin
tk1.kind := bareqop;
goto 1;
end; {else if}
end {else if}
else if kind1 = percentch then begin
if kind2 = eqch then begin
tk1.kind := percenteqop;
goto 1;
end; {if}
end {else if}
else if kind1 = carotch then begin
if kind2 = eqch then begin
tk1.kind := caroteqop;
goto 1;
end; {if}
end {else if}
else if kind1 = asteriskch then begin
if kind2 = eqch then begin
tk1.kind := asteriskeqop;
goto 1;
end; {if}
end {else if}
else if kind1 = slashch then begin
if kind2 = eqch then begin
tk1.kind := slasheqop;
goto 1;
end; {if}
end; {else if}
Error(63);
1:
end; {Merge}
procedure BuildStringToken (cp: ptr; len: integer);
{ Create a string token from a string }
{ }
{ Used to stringize macros. }
{ }
{ Parameters: }
{ cp - pointer to the first character }
{ len - number of characters in the string }
var
i: integer; {loop variable}
begin {BuildStringToken}
token.kind := stringconst;
token.class := stringConstant;
token.ispstring := false;
token.sval := pointer(GMalloc(len+2));
for i := 1 to len do begin
token.sval^.str[i] := chr(cp^);
cp := pointer(ord4(cp)+1);
end; {for}
token.sval^.length := len;
PutBackToken(token, true);
end; {BuildStringToken}
procedure DoInclude (default: boolean);
{ #include }
{ }
{ Parameters: }
{ default - open <defaults.h>? }
var
fp: filePtr; {pointer to an include file}
begin {DoInclude}
new(fp); {get a file record for the current file}
fp^.next := fileList;
fileList := fp;
fp^.name := includeFileGS;
fp^.sname := sourceFileGS;
fp^.lineNumber := lineNumber+1;
if OpenFile(true, default) then begin {open a new file and proceed from there}
lineNumber := 1;
StartInclude(@includeFileGS);
end {if}
else begin {handle a file name error}
fileList := fp^.next;
dispose(fp);
end; {else}
end; {DoInclude}
procedure Expand (macro: macroRecordPtr);
{ Expand a preprocessor macro }
{ }
{ Expands a preprocessor macro by putting tokens from the macro }
{ definition into the scanner's putback buffer. }
{ }
{ Parameters: }
{ macro - pointer to the macro to expand }
{ }
{ Globals: }
{ macroList - scanner putback buffer }
type
parameterPtr = ^parameterRecord;
parameterRecord = record {parameter list element}
next: parameterPtr; {next parameter}
tokens: tokenListRecordPtr; {token list}
tokenStart,tokenEnd: ptr; {source pointers (for stringization)}
end;
var
bPtr: ^macroRecordPtr; {pointer to hash bucket}
done: boolean; {used to check for loop termination}
expandEnabled: boolean; {can the token be expanded?}
i: integer; {loop counter}
inhibit: boolean; {inhibit parameter expansion?}
lexpandMacros: boolean; {local copy of expandMacros}
lPrintMacroExpansions: boolean; {local copy of printMacroExpansions}
mPtr: macroRecordPtr; {for checking list of macros}
newParm: parameterPtr; {for building a new parameter entry}
tlPtr, tPtr, tcPtr, lastPtr: tokenListRecordPtr; {work pointers}
paramCount: integer; {# of parameters found in the invocation}
parenCount: integer; {paren count; for balancing parenthesis}
parmEnd: parameterPtr; {for building a parameter list}
parms: parameterPtr; {points to the list of parameters}
pptr: parameterPtr; {work pointer for tracing parms list}
sp: longStringPtr; {work pointer}
stringization: boolean; {are we stringizing a parameter?}
begin {Expand}
lPrintMacroExpansions := printMacroExpansions; {inhibit token printing}
printMacroExpansions := false;
lexpandMacros := expandMacros; {prevent expansion of parameters}
expandMacros := false;
saveNumber := true; {save numeric strings}
parms := nil; {no parms so far}
if macro^.parameters >= 0 then begin {find the values of the parameters}
NextToken; {get the '(' (we hope...)}
if token.kind = lparench then begin
NextToken; {skip the '('}
paramCount := 0; {process the parameters}
parmEnd := nil;
repeat
done := true;
if token.kind <> rparench then begin
parenCount := 0;
paramCount := paramCount+1;
new(newParm);
newParm^.next := nil;
if parmEnd = nil then
parms := newParm
else
parmEnd^.next := newParm;
parmEnd := newParm;
newParm^.tokens := nil;
while (token.kind <> eofsy)
and ((parenCount <> 0)
or (not (token.kind in [rparench,commach]))) do begin
new(tPtr);
tPtr^.next := newParm^.tokens;
newParm^.tokens := tPtr;
tPtr^.token := token;
tPtr^.tokenStart := tokenStart;
tPtr^.tokenEnd := tokenEnd;
if token.kind = lparench then
parenCount := parenCount+1
else if token.kind = rparench then
parenCount := parenCount-1;
NextToken;
end; {while}
if token.kind = commach then begin
NextToken;
done := false;
end; {if}
end; {if}
until done;
if paramCount <> macro^.parameters then
Error(14);
if token.kind <> rparench then begin {insist on a closing ')'}
if not gettingFileName then {put back the source stream token}
PutBackToken(token, true);
Error(12);
end;
end {if}
else begin
Error(13);
if not gettingFileName then {put back the source stream token}
PutBackToken(token, true);
end; {else}
end; {if}
if macro^.readOnly then begin {handle special macros}
case macro^.algorithm of
1: begin {__LINE__}
token.kind := intconst;
token.numString := @lineStr;
token.class := intconstant;
token.ival := lineNumber;
lineStr := cnvis(token.ival);
tokenStart := @lineStr[1];
tokenEnd := pointer(ord4(tokenStart)+length(lineStr));
end;
2: begin {__FILE__}
token.kind := stringConst;
token.class := stringConstant;
token.ispstring := false;
sp := pointer(Malloc(5+sourceFileGS.theString.size));
sp^.length := sourceFileGS.theString.size;
for i := 1 to sourceFileGS.theString.size do
sp^.str[i] := sourceFileGS.theString.theString[i];
token.sval := sp;
tokenStart := @sp^.str;
tokenEnd := pointer(ord4(tokenStart)+sp^.length);
end;
3: begin {__DATE__}
token.kind := stringConst;
token.class := stringConstant;
token.ispstring := false;
token.sval := dateStr;
tokenStart := @dateStr^.str;
tokenEnd := pointer(ord4(tokenStart)+dateStr^.length);
end;
4: begin {__TIME__}
token.kind := stringConst;
token.class := stringConstant;
token.ispstring := false;
token.sval := timeStr;
tokenStart := @timeStr^.str;
tokenEnd := pointer(ord4(tokenStart)+timeStr^.length);
end;
5: begin {__STDC__}
token.kind := intConst; {__ORCAC__}
token.numString := @oneStr;
token.class := intConstant;
token.ival := 1;
oneStr := '1';
tokenStart := @oneStr[1];
tokenEnd := pointer(ord4(tokenStart)+1);
end;
6: begin {__VERSION__}
token.kind := stringConst;
token.class := stringConstant;
token.ispstring := false;
token.sval := versionStrL;
tokenStart := @versionStrL^.str;
tokenEnd := pointer(ord4(tokenStart)+versionStrL^.length);
end;
otherwise: Error(57);
end; {case}
PutBackToken(token, true);
end {if}
else begin
{expand the macro}
tlPtr := macro^.tokens; {place the tokens in the buffer...}
lastPtr := nil;
while tlPtr <> nil do begin
if tlPtr^.token.kind = macroParm then begin
pptr := parms; {find the correct parameter}
for i := 1 to tlPtr^.token.pnum do
if pptr <> nil then
pptr := pptr^.next;
if pptr <> nil then begin
{see if the macro is stringized}
stringization := false;
if tlPtr^.next <> nil then
stringization := tlPtr^.next^.token.kind = poundch;
{handle macro stringization}
if stringization then begin
tcPtr := pptr^.tokens;
while tcPtr <> nil do begin
if tcPtr^.token.kind = stringconst then
BuildStringToken(@tcPtr^.token.sval^.str,
tcPtr^.token.sval^.length)
else
BuildStringToken(tcPtr^.tokenStart,
ord(ord4(tcPtr^.tokenEnd)-ord4(tcPtr^.tokenStart)));
tcPtr := tcPtr^.next;
end; {while}
tlPtr := tlPtr^.next;
end {if}
{expand a macro parameter}
else begin
tcPtr := pptr^.tokens;
while tcPtr <> nil do begin
tokenStart := tcPtr^.tokenStart;
tokenEnd := tcPtr^.tokenEnd;
if tcPtr^.token.kind = ident then begin
mPtr := FindMacro(tcPtr^.token.name);
inhibit := false;
if tlPtr^.next <> nil then
if tlPtr^.next^.token.kind = poundpoundop then
inhibit := true;
if lastPtr <> nil then
if lastPtr^.token.kind = poundpoundop then
inhibit := true;
if (mPtr <> nil) and (not inhibit) then
Expand(mPtr)
else
PutBackToken(tcPtr^.token, true);
end {if}
else
PutBackToken(tcPtr^.token, true);
tcPtr := tcPtr^.next;
end; {while}
end; {else}
end; {if pptr <> nil}
end {if tlPtr^.token.kind = macroParm}
else begin
{place an explicit parm in the token list}
expandEnabled := true;
if tlPtr^.token.kind = ident then
if tlPtr^.token.name^ = macro^.name^ then
expandEnabled := false;
tokenStart := tlPtr^.tokenStart;
tokenEnd := tlPtr^.tokenEnd;
PutBackToken(tlPtr^.token, expandEnabled);
end; {else}
lastPtr := tlPtr;
tlPtr := tlPtr^.next;
end; {while}
end; {else}
while parms <> nil do begin {dispose of the parameter list}
tPtr := parms^.tokens;
while tPtr <> nil do begin
tlPtr := tPtr^.next;
dispose(tPtr);
tPtr := tlPtr;
end; {while}
parmEnd := parms^.next;
dispose(parms);
parms := parmEnd;
end; {while}
expandMacros := lexpandMacros; {restore the flags}
printMacroExpansions := lPrintMacroExpansions;
saveNumber := false; {stop saving numeric strings}
end; {Expand}
function GetFileName (mustExist: boolean): boolean;
{ Read a file name from a directive line }
{ }
{ parameters: }
{ mustExist - should we look for an existing file? }
{ }
{ Returns true if successful, false if not. }
{ }
{ Note: The file name is placed in workString. }
const
SRC = $B0; {source file type}
var
i,j: integer; {string index & loop vars}
procedure Expand (var name: pString);
{ Expands a name to a full pathname }
{ }
{ parameters: }
{ name - file name to expand }
var
exRec: expandDevicesDCBGS; {expand devices}
begin {Expand}
exRec.pcount := 2;
new(exRec.inName);
exRec.inName^.theString := name;
exRec.inName^.size := length(name);
new(exRec.outName);
exRec.outName^.maxSize := maxPath+4;
ExpandDevicesGS(exRec);
if toolerror = 0 then
with exRec.outName^.theString do begin
if size < maxPath then
theString[size+1] := chr(0);
name := theString;
end; {with}
dispose(exRec.inName);
dispose(exRec.outName);
end; {Expand}
function GetLibraryName (var name: pstring): boolean;
{ See if a library pathname is available }
{ }
{ Parameters: }
{ name - file name; set to pathname if result is true }
{ }
{ Returns: True if a name is available, else false }
var
lname: pString; {local copy of name}
begin {GetLibraryName}
lname := concat('13:ORCACDefs:', name);
Expand(lname);
if GetFileType(lname) = SRC then begin
name := lname;
GetLibraryName := true;
end {if}
else
GetLibraryName := false;
end; {GetLibraryName}
function GetLocalName (var name: pstring): boolean;
{ See if a local pathname is available }
{ }
{ Parameters: }
{ name - file name; set to pathname if result is true }
{ }
{ Returns: True if a name is available, else false }
var
lname: pstring; {work string}
pp: pathRecordPtr; {used to trace the path list}
begin {GetLocalName}
lname := name;
Expand(lname);
if GetFileType(lname) = SRC then begin
GetLocalName := true;
name := lname;
end {if}
else begin
GetLocalName := false;
pp := pathList;
while pp <> nil do begin
lname := concat(pp^.path^, name);
if GetFileType(lname) = SRC then begin
GetLocalName := true;
name := lname;
Expand(name);
pp := nil;
end {if}
else
pp := pp^.next;
end; {while}
end; {else}
end; {GetLocalName}
procedure MakeLibraryName (var name: pstring);
{ Create the library path name for an error message }
{ }
{ Parameters: }
{ name - file name; set to pathname }
begin {MakeLibraryName}
name := concat('13:ORCACDefs:', name);
Expand(name);
end; {MakeLibraryName}
procedure MakeLocalName (var name: pstring);
{ Create the local path name for an error message }
{ }
{ Parameters: }
{ name - file name; set to pathname }
begin {MakeLocalName}
Expand(name);
end; {MakeLocalName}
begin {GetFileName}
GetFileName := true;
gettingFileName := true; {in GetFileName}
while charKinds[ord(ch)] = ch_white do {finish processing the current line}
NextCh;
if ch = '<' then begin {process a library file...}
NextToken; {skip the '<'}
token.kind := stringconst; {convert a <> style name to a string}
token.class := stringConstant;
token.ispstring := false;
i := 0;
while not (charKinds[ord(ch)] in [ch_eol,ch_gt]) do begin
i := i+1;
if (i = maxLine) then begin
Error(16);
GetFileName := false;
i := 0;
end;
workString[i] := ch;
NextCh;
end; {while}
workString[0] := chr(i);
CheckDelimiters(workString);
if mustExist then begin
if not GetLibraryName(workString) then
if not GetLocalName(workString) then
MakeLibraryName(workString);
end {if}
else
MakeLibraryName(workString);
if ch = '>' then
NextCh
else begin
Error(15);
GetFileName := false;
end; {else}
end {if}
else begin
{handle file names that are strings or macro expansions}
expandMacros := true; {allow macros to be used in the name}
NextToken; {skip the command name}
if token.kind = stringConst then begin
LongToPString(@workString, token.sval);
CheckDelimiters(workString);
if mustExist then begin
if not GetLocalName(workString) then
if not GetLibraryName(workString) then
MakeLocalName(workString);
end {if}
else
MakeLocalName(workString);
end {if}
else if token.kind = ltch then begin
{expand a macro to create a <filename> form name}
NextToken;
workString[0] := chr(0);
while
(token.class in [reservedWord,intconstant,longconstant,doubleconstant])
or (token.kind in [dotch,ident]) do begin
if token.kind = ident then
workstring := concat(workstring, token.name^)
else if token.kind = dotch then
workstring := concat(workstring, '.')
else if token.class = reservedWord then
workstring := concat(workstring, reservedWords[token.kind])
else {if token.class in [intconst,longconst,doubleconst] then}
workstring := concat(workstring, token.numstring^);
NextToken;
end; {while}
CheckDelimiters(workString);
if mustExist then begin
if not GetLibraryName(workString) then
if not GetLocalName(workString) then
MakeLibraryName(workString);
end {if}
else
MakeLibraryName(workString);
if token.kind <> gtch then begin
Error(15);
GetFileName := false;
end; {if}
end {else if}
else begin
Error(59);
GetFileName := false;
end; {else}
end; {else}
while charKinds[ord(ch)] = ch_white {finish processing the current line}
do NextCh;
if charKinds[ord(ch)] <> ch_eol then {check for extra stuff on the line}
begin
Error(11);
GetFileName := false;
end; {if}
gettingFileName := false; {not in GetFileName}
end; {GetFileName}
function GetFileType {var name: pString): integer};
{ Checks to see if a file exists }
{ }
{ parameters: }
{ name - file name to check for }
{ }
{ Returns: File type if the file exists, or -1 if the file does }
{ not exist (or if GetFileInfo returns an error) }
var
pathname: gsosInString; {GS/OS style name}
giRec: getFileInfoOSDCB; {GetFileInfo record}
begin {GetFileType}
giRec.pcount := 3;
giRec.pathName := @pathname;
pathname.theString := name;
pathname.size := length(name);
GetFileInfoGS(giRec);
if ToolError = 0 then
GetFileType := giRec.fileType
else
GetFileType := -1;
end; {GetFileType}
function OpenFile {doInclude, default: boolean): boolean};
{ Open a new file and start scanning it }
{ }
{ Parameters: }
{ doInclude - are we doing a #include? }
{ default - use the name <defaults.h>? }
{ }
{ Returns: result from GetFileName }
var
gotName: boolean; {did we get a file name?}
begin {OpenFile}
if default then begin {get the file name}
workString := defaultName;
gotName := true;
end {if}
else
gotName := GetFileName(true);
if gotName then begin {read the file name from the line}
OpenFile := true; {we opened it}
if doInclude and progress then {note our progress}
writeln('Including ', workString);
WriteLine; {write the source line}
lineNumber := lineNumber+1;
firstPtr := pointer(ord4(chPtr)+2);
needWriteLine := false;
if doInclude then {set the disp in the file}
fileList^.disp := ord4(chPtr)-ord4(bofPtr);
with ffDCBGS do begin {purge the source file}
pCount := 5;
action := 7;
pathName := @includeFileGS.theString;
end; {with}
FastFileGS(ffDCBGS);
oldincludeFileGS := includeFileGS; {set the file name}
includeFileGS.theString.theString := workString;
includeFileGS.theString.size := length(workString);
ReadFile; {read the file}
chPtr := bofPtr; {set the start, end pointers}
eofPtr := pointer(ord4(bofPtr)+ffDCBGS.fileLength);
firstPtr := chPtr; {first char in line}
ch := chr(RETURN); {set the initial character}
if languageNumber <> long(ffDCBGS.auxType).lsw then begin
switchLanguages := true; {switch languages}
chPtr := eofPtr;
if doInclude then
TermError(7);
if fileList <> nil then
TermError(8);
end; {if}
end {if}
else
OpenFile := false; {we failed to opened it}
end; {OpenFile}
procedure PreProcess;
{ Handle preprocessor commands }
label 2;
var
lPrintMacroExpansions: boolean; {local copy of printMacroExpansions}
lReportEOL: boolean; {local copy of reportEOL}
tSkipping: boolean; {temp copy of the skipping variable}
val: integer; {expression value}
function Defined: boolean;
{ See if a macro is defined }
begin {Defined}
expandMacros := false; {block expansions}
NextToken; {skip the command name}
if token.class in [reservedWord,identifier] then begin
Defined := IsDefined(token.name); {see if the macro is defined}
expandMacros := true; {enable expansions}
NextToken; {skip the macro name}
if token.kind <> eolsy then {check for extra stuff on the line}
Error(11);
end {if}
else
Error(9);
end; {Defined}
procedure NumericDirective;
{ Process a constant expression for a directive that has a }
{ single number as the operand. }
{ }
{ Notes: The expression evaluator returns the value in the }
{ global variable expressionValue. }
begin {NumericDirective}
NextToken; {skip the directive name}
Expression(preprocessorExpression, []); {evaluate the expression}
end; {NumericDirective}
procedure ProcessIf (skip: boolean);
{ handle the processing for #if, #ifdef and #ifndef }
{ }
{ parameter: }
{ skip - should we skip to the #else }
var
ip: ifPtr; {used to create a new if record}
begin {ProcessIf}
if token.kind <> eolsy then {check for extra stuff on the line}
Error(11);
new(ip); {create a new if record}
ip^.next := ifList;
ifList := ip;
if tSkipping then {set the status of the record}
ip^.status := skippingToEndif
else if skip then
ip^.status := skippingToElse
else
ip^.status := processing;
ip^.elseFound := false; {no else has been found...}
tSkipping := ip^.status <> processing; {decide if we should be skipping}
end; {ProcessIf}
procedure DoAppend;
{ #append }
var
tbool: boolean; {temp boolean}
begin {DoAppend}
tbool := OpenFile(false, false); {open a new file and proceed from there}
lineNumber := 1;
end; {DoAppend}
procedure DoCDA;
{ #pragma cda NAME START SHUTDOWN }
begin {DoCDA}
FlagPragmas(p_cda);
isClassicDeskAcc := true;
NextToken; {skip the command name}
if token.kind = stringconst then {get the name}
begin
LongToPString(@menuLine, token.sval);
NextToken;
end {if}
else begin
isClassicDeskAcc := false;
Error(83);
end; {else}
if token.kind = ident then begin {get the start name}
openName := token.name;
NextToken;
end {if}
else begin
isClassicDeskAcc := false;
Error(9);
end; {else}
if token.kind = ident then begin {get the shutdown name}
closeName := token.name;
NextToken;
end {if}
else begin
isClassicDeskAcc := false;
Error(9);
end; {else}
if token.kind <> eolsy then {make sure there is nothing else on the line}
Error(11);
end; {DoCDA}
procedure DoCDev;
{ #pragma cdev START }
begin {DoCDev}
FlagPragmas(p_cdev);
isCDev := true;
NextToken; {skip the command name}
if token.kind = ident then begin {get the start name}
openName := token.name;
NextToken;
end {if}
else begin
isCDev := false;
Error(9);
end; {else}
if token.kind <> eolsy then {make sure there is nothing else on the line}
Error(11);
end; {DoCDev}
procedure DoDefine;
{ #define }
{ }
{ The way parameters are handled is a bit obtuse. Parameters }
{ have their own token type, with the token having an }
{ associated parameter number, pnum. Pnum is the number of }
{ parameters to skip to get to the parameter in the parameter }
{ list. }
{ }
{ In the macro record, parameters indicates how many }
{ parameters there are in the definition. -1 indicates that }
{ there is no parameter list, while 0 indicates that a list }
{ must exist, but that there are no parameters in the list. }
label 1,2,3;
type
stringListPtr = ^stringList;
stringList = record {for the parameter list}
next: stringListPtr;
str: pString;
end;
var
bPtr: ^macroRecordPtr; {pointer to head of hash bucket}
done: boolean; {used to test for loop termination}
i: integer; {loop variable}
mf: macroRecordPtr; {pointer to existing macro record}
mPtr: macroRecordPtr; {pointer to new macro record}
np: stringListPtr; {new parameter}
parameterList: stringListPtr; {list of parameter names}
parameters: integer; {local copy of mPtr^.parameters}
ple: stringListPtr; {pointer to the last element in parameterList}
pnum: integer; {for counting parameters}
tPtr,tk1,tk2: tokenListRecordPtr; {pointer to a token}
{for building token strings}
sptr: longStringPtr; {token string work pointer}
tcp: ptr; {temp character pointer}
slen: integer; {token string length}
begin {DoDefine}
expandMacros := false; {block expansions}
saveNumber := true; {save characters in numeric tokens}
parameterList := nil; {no parameters yet}
NextToken; {get the token name}
{convert reserved words to identifiers}
if token.class = reservedWord then begin
token.name := @reservedWords[token.kind];
token.kind := ident;
token.class := identifier;
end {if}
else if token.kind = typedef then
token.kind := ident;
if token.kind = ident then begin {we have a name...}
mPtr := pointer(GMalloc(sizeof(macroRecord))); {create a macro record}
mPtr^.name := token.name; {record the name}
mPtr^.saved := false; {not saved in symbol file}
mPtr^.tokens := nil; {no tokens yet}
charKinds[ord('#')] := ch_pound; {allow # as a token}
if ch = '(' then begin {scan the parameter list...}
NextToken; {done with the name token...}
NextToken; {skip the opening '('}
parameters := 0; {no parameters yet}
ple := nil;
repeat {get the parameter names}
done := true;
if token.class = reservedWord then begin
token.name := @reservedWords[token.kind];
token.kind := ident;
token.class := identifier;
end {if}
else if token.kind = typedef then
token.kind := ident;
if token.kind = ident then begin
new(np);
np^.next := nil;
np^.str := token.name^;
if ple = nil then
parameterList := np
else
ple^.next := np;
ple := np;
NextToken;
parameters := parameters+1;
if token.kind = commach then begin
NextToken;
done := false;
end; {if}
end; {if}
until done;
if token.kind = rparench then {insist on a matching ')'}
NextToken
else
Error(12);
end {if}
else begin
parameters := -1; {no parameter list exists}
NextToken; {done with the name token...}
end; {else}
mPtr^.parameters := parameters; {record the # of parameters}
while token.kind <> eolsy do begin {place tokens in the replace list...}
if token.class = reservedWord then begin
token.name := @reservedWords[token.kind];
token.kind := ident;
token.class := identifier;
end {if}
else if token.kind = typedef then
token.kind := ident;
if token.kind = ident then begin {special handling for identifiers}
np := parameterList; {change parameters to macroParm}
pnum := 0;
while np <> nil do begin
if np^.str = token.name^ then begin
token.kind := macroParm;
token.class := macroParameter;
token.pnum := pnum;
goto 1;
end; {if}
pnum := pnum+1;
np := np^.next;
end; {while}
end; {if}
1: tPtr := pointer(GMalloc(sizeof(tokenListRecord)));
tPtr^.next := mPtr^.tokens;
mPtr^.tokens := tPtr;
tPtr^.token := token;
tPtr^.tokenStart := tokenStart;
tPtr^.tokenEnd := tokenEnd;
slen := ord(ord4(chPtr) - ord4(tokenStart));
sptr := pointer(GMalloc(slen+2));
sptr^.length := slen;
tcp := tokenStart;
for i := 1 to slen do begin
sptr^.str[i] := chr(tcp^);
tcp := pointer(ord4(tcp)+1);
end; {for}
tPtr^.tokenString := sptr;
NextToken;
end; {while}
mPtr^.readOnly := false;
mPtr^.algorithm := 0;
if IsDefined(mPtr^.name) then begin
mf := macroFound;
if mf^.parameters = mPtr^.parameters then begin
tk1 := mf^.tokens;
tk2 := mPtr^.tokens;
while (tk1 <> nil) and (tk2 <> nil) do begin
if tk1^.token.kind <> tk2^.token.kind then
goto 3;
if tk1^.token.class = tk2^.token.class then
case tk1^.token.class of
reservedWord, reservedSymbol: ;
identifier:
if tk1^.token.name^ <> tk2^.token.name^ then
goto 3;
intConstant:
if tk1^.token.ival <> tk2^.token.ival then
goto 3;
longConstant:
if tk1^.token.lval <> tk2^.token.lval then
goto 3;
doubleConstant:
if tk1^.token.rval <> tk2^.token.rval then
goto 3;
stringConstant: begin
if tk1^.token.sval^.length <> tk2^.token.sval^.length
then goto 3;
for i := 1 to tk1^.token.sval^.length do
if tk1^.token.sval^.str[i] <>
tk2^.token.sval^.str[i] then
goto 3;
end;
macroParameter:
if tk1^.token.pnum <> tk2^.token.pnum then
goto 3;
otherwise:
Error(57);
end; {case}
tk1 := tk1^.next;
tk2 := tk2^.next;
end; {while}
if (tk1 = nil) and (tk2 = nil) then
goto 2;
end; {if}
3: Error(5);
goto 2;
end; {if}
{insert the macro in the macro list}
bPtr := pointer(ord4(macros) + Hash(mPtr^.name));
mPtr^.next := bPtr^;
bPtr^ := mPtr;
end {if}
else
Error(9); {identifier expected}
2:
expandMacros := true; {enable expansions}
while parameterList <> nil do begin {dump the parameter names}
np := parameterList;
parameterList := np^.next;
dispose(np);
end; {while}
charKinds[ord('#')] := illegal; {don't allow # as a token}
saveNumber := false; {stop saving numeric strings}
end; {DoDefine}
procedure DoElif;
{ #elif expression }
var
ip: ifPtr; {temp; for efficiency}
begin {DoElif}
ip := ifList;
if ip <> nil then begin
{decide if we should be skipping}
tSkipping := ip^.status <> skippingToElse;
if tSkipping then
ip^.status := skippingToEndif
else begin
{evaluate the condition}
NumericDirective; {evaluate the condition}
if token.kind <> eolsy then {check for extra stuff on the line}
Error(11);
if expressionValue = 0 then
ip^.status := skippingToElse
else
ip^.status := processing;
tSkipping := ip^.status <> processing; {decide if we should be skipping}
end; {else}
end
else
Error(20);
end; {DoElif}
procedure DoElse;
{ #else }
begin {DoElse}
NextToken; {skip the command name}
if token.kind <> eolsy then {check for extra stuff on the line}
Error(11);
if ifList <> nil then begin
if ifList^.elseFound then {check for multiple elses}
Error(19)
else
ifList^.elseFound := true;
{decide if we should be skipping}
tSkipping := ifList^.status <> skippingToElse;
if tSkipping then {set the status}
ifList^.status := skippingToEndif
else
ifList^.status := processing;
end
else
Error(20);
end; {DoElse}
procedure DoEndif;
{ #endif }
var
ip: ifPtr; {used to create a new if record}
begin {DoEndif}
NextToken; {skip the command name}
if token.kind <> eolsy then {check for extra stuff on the line}
Error(11);
if ifList <> nil then begin
ip := ifList; {remove the top if record from the list}
ifList := ip^.next;
dispose(ip);
if ifList = nil then {decide if we should be skipping}
tSkipping := false
else
tSkipping := ifList^.status <> processing;
end {if}
else
Error(20);
end; {DoEndif}
procedure DoError;
{ #error STRING }
var
i: integer; {loop variable}
len: integer; {string length}
msg: stringPtr; {error message ptr}
begin {DoError}
NextToken; {skip the command name}
if token.kind = stringConst then begin
numErrors := numErrors+1;
new(msg);
len := token.sval^.length;
if len > 246 then
len := 246;
msg^ := '#error: ';
for i := 1 to len do
msg^ := concat(msg^, token.sval^.str[i]);
writeln(msg^);
if terminalErrors then begin
if enterEditor then
ExitToEditor(msg, ord4(firstPtr)-ord4(bofPtr))
else
TermError(0);
end; {if}
end {if}
else
Error(83);
NextToken; {skip the command name}
if token.kind <> eolsy then {check for extra stuff on the line}
Error(11);
end; {DoError}
procedure DoFloat;
{ #pragma float NUMBER NUMBER }
begin {DoFloat}
FlagPragmas(p_float);
NextToken;
if token.kind in [intconst,uintconst] then begin
floatCard := token.ival;
NextToken;
end {if}
else
Error(18);
if token.kind in [intconst,uintconst] then begin
floatSlot := $C080 | (token.ival << 4);
NextToken;
end {if}
else
Error(18);
end; {DoFloat}
procedure DoKeep;
{ #pragma keep FILENAME }
begin {DoKeep}
FlagPragmas(p_keep);
if GetFileName(false) then begin {read the file name}
if foundFunction then
Error(17);
if liDCBGS.kFlag = 0 then begin {use the old name if there is one...}
liDCBGS.kFlag := 1;
outFileGS.theString.theString := workString;
outFileGS.theString.size := length(workString);
end; {if}
end; {if}
end; {DoKeep}
procedure DoNBA;
{ #pragma nba MAIN }
begin {DoNBA}
FlagPragmas(p_nba);
isNBA := true;
NextToken; {skip the command name}
if token.kind = ident then begin {get the open name}
openName := token.name;
NextToken;
end {if}
else begin
isNBA := false;
Error(9);
end; {else}
if token.kind <> eolsy then {make sure there is nothing else on the line}
Error(11);
end; {DoNBA}
procedure DoNDA;
{ #pragma nda OPEN CLOSE ACTION INIT PERIOD EVENTMASK MENULINE}
function GetInteger: integer;
{ Get a signed integer constant }
var
isNegative: boolean; {is the value negative?}
value: integer; {value to return}
begin {GetInteger}
isNegative := false;
value := 0;
if token.kind = plusch then
NextToken
else if token.kind = minusch then begin
NextToken;
isNegative := true;
end; {else if}
if token.kind in [intconst,uintconst] then begin
value := token.ival;
NextToken;
end {if}
else begin
isNewDeskAcc := false;
Error(18);
end; {else}
if isNegative then
GetInteger := -value
else
GetInteger := value;
end; {GetInteger}
begin {DoNDA}
FlagPragmas(p_nda);
isNewDeskAcc := true;
NextToken; {skip the command name}
if token.kind = ident then begin {get the open name}
openName := token.name;
NextToken;
end {if}
else begin
isNewDeskAcc := false;
Error(9);
end; {else}
if token.kind = ident then begin {get the close name}
closeName := token.name;
NextToken;
end {if}
else begin
isNewDeskAcc := false;
Error(9);
end; {else}
if token.kind = ident then begin {get the action name}
actionName := token.name;
NextToken;
end {if}
else begin
isNewDeskAcc := false;
Error(9);
end; {else}
if token.kind = ident then begin {get the init name}
initName := token.name;
NextToken;
end {if}
else begin
isNewDeskAcc := false;
Error(9);
end; {else}
refreshPeriod := GetInteger; {get the period}
eventMask := GetInteger; {get the event Mask}
if token.kind = stringconst then {get the name}
begin
LongToPString(@menuLine, token.sval);
NextToken;
end {if}
else begin
isNewDeskAcc := false;
Error(83);
end; {else}
if token.kind <> eolsy then {make sure there is nothing else on the line}
Error(11);
end; {DoNDA}
procedure DoUndef;
{ #undef }
label 1;
var
bPtr: ^macroRecordPtr; {hash bucket pointer}
mPtr,lastPtr: macroRecordPtr; {work pointers}
begin {DoUndef}
expandMacros := false; {block expansions}
NextToken; {get the token name}
{convert reserved words to identifiers}
if token.class = reservedWord then begin
token.name := @reservedWords[token.kind];
token.kind := ident;
token.class := identifier;
end; {if}
if token.kind = ident then begin
{find the bucket to search}
bPtr := pointer(ord4(macros)+Hash(token.name));
lastPtr := nil; {find and delete the macro entry}
mPtr := bPtr^;
while mPtr <> nil do begin
if mPtr^.name^ = token.name^ then begin
if mPtr^.readOnly then
Error(10)
else begin
if lastPtr = nil then
bPtr^ := mPtr^.next
else
lastPtr^.next := mPtr^.next;
end; {else}
goto 1;
end; {if}
lastPtr := mPtr;
mPtr := mPtr^.next;
end; {while}
end {if}
else
Error(9); {identifier expected}
1:
expandMacros := true; {enable expansions}
NextToken; {skip the macro name}
if token.kind <> eolsy then {make sure there's no junk on the line}
Error(11);
end; {DoUndef}
procedure DoXCMD;
{ #pragma xcmd MAIN }
begin {DoXCMD}
FlagPragmas(p_xcmd);
isXCMD := true;
NextToken; {skip the command name}
if token.kind = ident then begin {get the open name}
openName := token.name;
NextToken;
end {if}
else begin
isXCMD := false;
Error(9);
end; {else}
if token.kind <> eolsy then {make sure there is nothing else on the line}
Error(11);
end; {DoXCMD}
begin {PreProcess}
lPrintMacroExpansions := printMacroExpansions; {inhibit token printing}
printMacroExpansions := false;
lReportEOL := reportEOL; {we need to see eol's}
reportEOL := true;
tSkipping := skipping; {don't skip the directive name!}
skipping := false;
NextCh; {skip the '#' char}
while charKinds[ord(ch)] = ch_white do {skip white space}
NextCh;
if ch in ['a','d','e','i','l','p','u'] then begin
NextToken;
case token.kind of
ifsy: begin
NumericDirective;
ProcessIf(expressionValue = 0);
goto 2;
end;
elsesy: begin
DoElse;
goto 2;
end;
ident: begin
case token.name^[1] of
'a':
if token.name^ = 'append' then begin
if tskipping then goto 2;
DoAppend;
goto 2;
end; {if}
'd':
if token.name^ = 'define' then begin
if tskipping then goto 2;
DoDefine;
goto 2;
end; {if}
'e':
if token.name^ = 'endif' then begin
DoEndif;
goto 2;
end {if}
else if token.name^ = 'else' then begin
DoElse;
goto 2;
end {else if}
else if token.name^ = 'elif' then begin
DoElif;
goto 2;
end {else if}
else if token.name^ = 'error' then begin
if tskipping then goto 2;
DoError;
goto 2;
end; {else if}
'i':
if token.name^ = 'if' then begin
NumericDirective;
ProcessIf(expressionValue = 0);
goto 2;
end {if}
else if token.name^ = 'ifdef' then begin
ProcessIf(not Defined);
goto 2;
end {else}
else if token.name^ = 'ifndef' then begin
ProcessIf(Defined);
goto 2;
end {else}
else if token.name^ = 'include' then begin
if tskipping then goto 2;
DoInclude(false);
goto 2;
end; {else}
'l':
if token.name^ = 'line' then begin
if tskipping then goto 2;
FlagPragmas(p_line);
NextToken;
if token.kind = intconst then begin
lineNumber := token.ival;
NextToken;
end {if}
else
Error(18);
if lineNumber < 0 then
lineNumber := 0;
if token.kind = stringconst then begin
LongToPString(
pointer(ord4(@sourceFileGS.theString)+1),
token.sval);
sourceFileGS.theString.size := token.sval^.length;
NextToken;
end; {if}
if token.kind <> eolsy then
Error(11);
goto 2;
end; {if}
'p':
if token.name^ = 'pragma' then begin
if tskipping then goto 2;
NextToken;
if token.name^ = 'keep' then
DoKeep
else if token.name^ = 'debug' then begin
{ debug bits: }
{ 1 - range checking }
{ 2 - create debug code }
{ 4 - generate profiles }
{ 8 - generate traceback code }
{ 16 - check for stack errors }
FlagPragmas(p_debug);
NumericDirective;
val := long(expressionValue).lsw;
rangeCheck := odd(val);
debugFlag := odd(val >> 1);
profileFlag := odd(val >> 2);
traceBack := odd(val >> 3);
checkStack := odd(val >> 4);
profileFlag := profileFlag or debugFlag;
if token.kind <> eolsy then
Error(11);
goto 2;
end {else}
else if token.name^ = 'lint' then begin
FlagPragmas(p_lint);
NumericDirective;
lint := long(expressionValue).lsw;
if token.kind <> eolsy then
Error(11);
goto 2;
end {else}
else if token.name^ = 'memorymodel' then begin
FlagPragmas(p_memorymodel);
NumericDirective;
smallMemoryModel := expressionValue = 0;
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'expand' then begin
FlagPragmas(p_expand);
NumericDirective;
lPrintMacroExpansions := expressionValue <> 0;
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'optimize' then begin
{ optimize bits: }
{ 1 - intermediate code peephole }
{ 2 - native peephole }
{ 4 - register value tracking }
{ 8 - remove stack checks }
{ 16 - common subexpression elimination }
{ 32 - loop invariant removal }
FlagPragmas(p_optimize);
NumericDirective;
val := long(expressionValue).lsw;
peepHole := odd(val);
npeepHole := odd(val >> 1);
registers := odd(val >> 2);
saveStack := not odd(val >> 3);
commonSubexpression := odd(val >> 4);
loopOptimizations := odd(val >> 5);
strictVararg := not odd(val >> 6);
if saveStack or strictVararg then
npeepHole := false;
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'unix' then begin
{ unix bits: }
{ 1 - int is 32 bits }
FlagPragmas(p_unix);
NumericDirective;
val := long(expressionValue).lsw;
unix_1 := odd(val);
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'stacksize' then begin
FlagPragmas(p_stacksize);
NumericDirective;
stackSize := long(expressionValue).lsw;
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'cda' then
DoCDA
else if token.name^ = 'cdev' then
DoCDev
else if token.name^ = 'nda' then
DoNDA
else if token.name^ = 'nba' then
DoNBA
else if token.name^ = 'xcmd' then
DoXCMD
else if token.name^ = 'toolparms' then begin
FlagPragmas(p_toolparms);
NumericDirective;
toolParms := expressionValue <> 0;
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'databank' then begin
FlagPragmas(p_databank);
NumericDirective;
dataBank := expressionValue <> 0;
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'float' then
DoFloat
else if token.name^ = 'rtl' then begin
FlagPragmas(p_rtl);
rtl := true;
NextToken;
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'noroot' then begin
FlagPragmas(p_noroot);
noroot := true;
NextToken;
if token.kind <> eolsy then
Error(11);
end {else if}
{ else if token.name^ = 'printmacros' then begin {debug}
{ PrintMacroTable;
NextToken;
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'path' then begin
NextToken;
if token.kind = stringConst then begin
LongToPString(workString, token.sval);
AddPath(workString);
NextToken;
end {if}
else
Error(83);
if token.kind <> eolsy then
Error(11);
end {else if}
else if token.name^ = 'ignore' then begin
{ ignore bits: }
{ 1 - don't flag illegal tokens in skipped source }
{ 8 - allow // comments }
FlagPragmas(p_ignore);
NumericDirective;
val := long(expressionValue).lsw;
skipIllegalTokens := odd(val);
slashSlashComments := odd(val >> 3);
if token.kind <> eolsy then
Error(11);
end {else if}
else if (lint & lintPragmas) <> 0 then
Error(110);
goto 2;
end; {if}
'u':
if token.name^ = 'undef' then begin
if tskipping then goto 2;
DoUndef;
goto 2;
end; {if}
otherwise: Error(57);
end; {case}
end;
otherwise: ;
end; {case}
end {if}
else if charKinds[ord(ch)] = ch_eol {allow null commands}
then begin
NextToken;
goto 2;
end; {else if}
Error(8); {bad preprocessor command}
2:
charKinds[ord('#')] := ch_pound; {allow # as a token}
expandMacros := false; {skip to the end of the line}
flagOverflows := false;
skipping := tSkipping;
while not (token.kind in [eolsy,eofsy]) do
NextToken;
flagOverflows := true;
expandMacros := true;
charKinds[ord('#')] := illegal; {don't allow # as a token}
reportEOL := lReportEOL; {restore flags}
printMacroExpansions := lPrintMacroExpansions;
skipping := tskipping;
end; {PreProcess}
{-- Externally available routines ------------------------------}
procedure DoDefaultsDotH;
{ Handle the defaults.h file }
var
name: pString; {name of the default file}
begin {DoDefaultsDotH}
name := defaultName;
if GetFileType(name) <> -1 then
DoInclude(true);
end; {DoDefaultsDotH}
procedure Error {err: integer};
{ flag an error }
{ }
{ err - error number }
begin {Error}
if numErr = maxErr then {set the error number}
errors[maxErr].num := 4
else begin
numErr := numErr+1;
numErrors := numErrors+1;
liDCBGS.merrf := 16;
errors[numErr].num := err;
end; {else}
with errors[numErr] do begin {record the position of the error}
line := tokenLine;
col := tokenColumn;
end; {with}
codeGeneration := false; {inhibit code generation}
end; {Error}
{procedure Error2 {loc, err: integer} {debug}
{ flag an error }
{ }
{ loc - error location }
{ err - error number }
{begin {Error2}
{writeln('Error ', err:1, ' flagged at location ', loc:1);
Error(err);
end; {Error2}
procedure DoNumber {scanWork: boolean};
{ The current character starts a number - scan it }
{ }
{ Parameters: }
{ scanWork - get characters from workString? }
{ }
{ Globals: }
{ ch - first character in sequence; set to first char }
{ after sequence }
{ workString - string to take numbers from }
label 1;
var
c2: char; {next character to process}
i: integer; {loop index}
isHex: boolean; {is the value a hex number?}
isLong: boolean; {is the value a long number?}
isReal: boolean; {is the value a real number?}
numIndex: 0..maxLine; {index into workString}
sp: stringPtr; {for saving identifier names}
stringIndex: 0..maxLine; {length of the number string}
unsigned: boolean; {is the number unsigned?}
val: integer; {value of a digit}
numString: pString; {characters in the number}
procedure NextChar;
{ Return the next character that is a part of the number }
begin {NextChar}
if scanWork then begin
if ord(workString[0]) <> numIndex then begin
numIndex := numIndex+1;
c2 := workString[numIndex];
end {if}
else
c2 := ' ';
end {if}
else begin
NextCh;
c2 := ch;
end; {else}
end; {NextChar}
procedure GetDigits;
{ Read in a digit stream }
{ }
{ Variables: }
{ c2 - next character to process }
{ numString - digit sequence added to this string }
{ stringIndex - length of the string }
begin {GetDigits}
while (charKinds[ord(c2)] = digit) or
(isHex and (c2 in ['a'..'f','A'..'F'])) do begin
if c2 in ['a'..'f'] then
c2 := chr(ord(c2) & $5F);
stringIndex := stringIndex+1;
if stringIndex > 255 then begin
Error(6);
stringIndex := 1;
end; {if}
numString[stringIndex] := c2;
NextChar;
end; {while}
end; {GetDigits}
begin {DoNumber}
isHex := false; {assume it's not hex}
isReal := false; {assume it's an integer}
isLong := false; {assume a short integer}
unsigned := false; {assume signed numbers}
stringIndex := 0; {no digits so far...}
if scanWork then begin {set up the scanner}
numIndex := 0;
NextChar;
end {if}
else
c2 := ch;
if c2 = '.' then begin {handle the case of no leading digits}
stringIndex := 1;
numString[1] := '0';
end {if}
else begin
GetDigits; {read the leading digit stream}
if c2 in ['x','X'] then {detect hex numbers}
if stringIndex = 1 then
if numString[1] = '0' then begin
stringIndex := 2;
numString[2] := 'X';
NextChar;
isHex := true;
GetDigits;
goto 1;
end; {if}
end;
if c2 = '.' then begin {handle a decimal}
stringIndex := stringIndex+1;
numString[stringIndex] := '.';
NextChar;
isReal := true;
if charKinds[ord(c2)] = digit then
GetDigits
else if stringIndex = 2 then begin
numString[3] := '0';
stringIndex := 3;
end; {else}
end; {if}
if c2 in ['e','E'] then begin {handle an exponent}
stringIndex := stringIndex+1;
numString[stringIndex] := 'e';
NextChar;
isReal := true;
if c2 in ['+','-'] then begin
stringIndex := stringIndex+1;
numString[stringIndex] := c2;
NextChar;
end; {if}
if c2 in ['0'..'9'] then
GetDigits
else begin
stringIndex := stringIndex+1;
numString[stringIndex] := '0';
Error(101);
end; {else}
end; {if}
1:
while c2 in ['l','u','L','U'] do {check for long or unsigned}
if c2 in ['l','L'] then begin
NextChar;
if not isReal then
isLong := true;
end {if}
else {if c2 in ['u','U'] then} begin
NextChar;
unsigned := true;
if isReal then
Error(91);
end; {else}
if c2 in ['f','F'] then begin {allow F designator on reals}
if unsigned then
Error(91);
if not isReal then begin
Error(100);
isReal := true;
end; {if}
NextChar;
end; {if}
numString[0] := chr(stringIndex); {set the length of the string}
if isReal then begin {convert a real constant}
token.kind := doubleConst;
token.class := doubleConstant;
if stringIndex > 80 then begin
Error(6);
token.rval := 0.0;
end {if}
else
token.rval := cnvsd(numString);
end {if}
else if numString[1] <> '0' then begin {convert a decimal integer}
if (stringIndex > 5)
or (not unsigned and (stringIndex = 5) and (numString > '32767'))
or (unsigned and (stringIndex = 5) and (numString > '65535')) then
isLong := true;
if (stringIndex > 10) or
((stringIndex = 10) and (numString > '4294967295')) then begin
numString := '0';
if flagOverflows then
Error(6);
end; {if}
if isLong then begin
token.class := longConstant;
token.lval := Convertsl(numString);
if unsigned then
token.kind := ulongConst
else begin
token.kind := longConst;
if token.lval < 0 then
token.kind := ulongConst;
end; {else}
end {if}
else begin
if unsigned then
token.kind := uintConst
else
token.kind := intConst;
token.class := intConstant;
token.lval := Convertsl(numString);
end; {else}
end {else if}
else begin {hex & octal}
token.lval := 0;
if isHex then begin
i := 3;
while i <= length(numString) do begin
if token.lval & $F0000000 <> 0 then begin
i := maxint;
if flagOverflows then
Error(6);
end {if}
else begin
if numString[i] > '9' then
val := (ord(numString[i])-7) & $000F
else
val := ord(numString[i]) & $000F;
token.lval := (token.lval << 4) | val;
i := i+1;
end; {else}
end; {while}
end {if}
else begin
i := 1;
while i <= length(numString) do begin
if token.lval & $E0000000 <> 0 then begin
i := maxint;
if flagOverflows then
Error(6);
end {if}
else begin
if numString[i] in ['8','9'] then
Error(7);
token.lval := (token.lval << 3) | (ord(numString[i]) & $0007);
i := i+1;
end; {else}
end; {while}
end; {else}
if long(token.lval).msw <> 0 then
isLong := true;
if isLong then begin
if unsigned then
token.kind := ulongConst
else
token.kind := longConst;
token.class := longConstant;
end {if}
else begin
if (long(token.lval).lsw & $8000) <> 0 then
unsigned := true;
if unsigned then
token.kind := uintConst
else
token.kind := intConst;
token.class := intConstant;
end; {else}
end; {else}
if saveNumber then begin
sp := pointer(GMalloc(length(numString)+1));
CopyString(pointer(sp), @numString);
token.numString := sp;
end; {if}
if scanWork then {make sure we read all characters}
if ord(workString[0]) <> numIndex then
Error(63);
end; {DoNumber}
procedure InitScanner {start, end: ptr};
{ initialize the scanner }
{ }
{ start - pointer to the first character in the file }
{ end - points one byte past the last character in the file }
var
chi: minChar..maxChar; {loop variable}
lch: char; {next command line character}
cp: ptr; {character pointer}
i: 0..hashSize; {loop variable}
negative: boolean; {is a number nagative?}
mp: macroRecordPtr; {for building the predefined macros}
bp: ^macroRecordPtr;
timeString: packed array[1..20] of char; {time from misc. tools}
procedure NextCh;
{ Get the next character from the command line }
begin {NextCh}
lch := chr(cp^);
cp := pointer(ord4(cp)+1);
tokenColumn := tokenColumn+1;
if tokenColumn > infoStringGS.theString.size then
lch := chr(0);
end; {NextCh}
function GetWord: stringPtr;
{ Read a word from the command line }
var
i: integer; {string index}
sp: stringPtr; {string pointer}
begin {GetWord}
i := 0;
while not (lch in [' ', chr(0), chr(9), '=']) do begin
i := i+1;
workString[i] := lch;
NextCh;
end; {while}
workString[0] := chr(i);
sp := pointer(malloc(length(workString)+1));
CopyString(pointer(sp), @workString);
GetWord := sp;
end; {GetWord}
function EscapeCh: integer;
{ Find and return the next character in a string or char }
{ constant. Handle escape sequences if they are found. }
{ (The character is returned as an ordinal value.) }
{ }
{ Globals: }
{ lch - first character in sequence; set to first char }
{ after sequence }
label 1;
var
dig: 0..15; {value of a hex digit}
skipChar: boolean; {get next char when done?}
val: 0..4095; {hex escape code value (scaled to 0..255)}
begin {EscapeCh}
1: skipChar := true;
if lch = '\' then begin
NextCh;
if lch in ['0'..'7','a','b','t','n','v','f','p','r','x'] then
case lch of
'0','1','2','3','4','5','6','7': begin
val := 0;
while lch in ['0'..'7'] do begin
val := (val << 3) | (ord(lch) & 7);
NextCh;
end; {while}
EscapeCh := val & $FF;
skipChar := false;
end;
'a': EscapeCh := 7;
'b': EscapeCh := 8;
't': EscapeCh := 9;
'n': EscapeCh := 10;
'v': EscapeCh := 11;
'f': EscapeCh := 12;
'p': begin
EscapeCh := ord('p');
ispstring := true;
end;
'r': EscapeCh := 13;
'x': begin
val := 0;
NextCh;
while lch in ['0'..'9','a'..'f','A'..'F'] do begin
if lch in ['0'..'9'] then
dig := ord(lch) & $0F
else begin
lch := chr(ord(lch)&$5F);
dig := ord(lch)-ord('A')+10;
end; {else}
val := (val << 4) | dig;
NextCh;
end; {while}
skipChar := false;
EscapeCh := val & $FF;
end;
otherwise: Error(57);
end {case}
else
EscapeCh := ord(lch);
end {if}
else
EscapeCh := ord(lch);
if skipChar then
NextCh;
end; {EscapeCh}
procedure GetString;
{ read a string token from the command line }
var
i: integer; {string length}
setLength: boolean; {is the current string a p-string?}
sPtr: longstringPtr; {work string pointer}
begin {GetString}
token.kind := stringconst; {set up the token}
token.class := stringConstant;
i := 0; {set up for the string scan}
ispstring := false;
setLength := false;
new(sPtr);
NextCh; {skip the opening "}
{read the characters}
while not (charKinds[ord(lch)] in [ch_string,ch_eol,ch_eof]) do begin
i := i+1;
if i = longstringlen then begin
i := 1001;
Error(90);
end; {if}
sPtr^.str[i] := chr(EscapeCh);
if (i = 1) and ispstring then
setLength := true;
end; {while}
if lch = '"' then {process the end of the string}
NextCh
else
Error(3);
if setLength then {check for a p-string}
sPtr^.str[1] := chr(i-1);
token.ispstring := setLength;
sPtr^.length := i; {set the string length}
token.sval := pointer(Malloc(i+3)); {put the string in the string pool}
CopyLongString(token.sval, pointer(sPtr));
dispose(sPtr);
token.sval^.str[i+1] := chr(0); {add null in case the string is extended}
end; {GetString}
begin {InitScanner}
printMacroExpansions := false; {don't print the token list}
skipIllegalTokens := false; {flag illegal tokens in skipped code}
slashSlashComments := true; {allow // comments}
foundFunction := false; {no functions found so far}
fileList := nil; {no included files}
gettingFileName := false; {not in GetFileName}
ifList := nil; {no conditional comp. records}
skipping := false; {not skipping tokens}
flagOverflows := true; {flag overflow errors?}
new(macros); {no preprocessor macros so far}
for i := 0 to hashSize do
macros^[i] := nil;
pathList := nil; {no additional search paths}
charKinds[ord('#')] := illegal; {don't allow # as a token}
tokenList := nil; {nothing in putback buffer}
saveNumber := false; {don't save numbers}
expandMacros := true; {enable macro expansion}
reportEOL := false; {report eolsy as a token?}
lineNumber := 1; {start the line counter}
chPtr := start; {set the start, end pointers}
eofPtr := endPtr;
firstPtr := start; {first char in line}
numErr := 0; {no errors so far}
numErrors := 0;
includeCount := 0; {no pending calls to EndInclude}
lint := 0; {turn off lint checks}
ch := chr(RETURN); {set the initial character}
needWriteLine := false; {no lines are pending}
switchLanguages := false; {not switching languages}
lastWasReturn := false; {last char was not return}
doingstring := false; {not doing a string}
unix_1 := false; {int is 16 bits}
new(mp); {__LINE__}
mp^.name := @'__LINE__';
mp^.parameters := -1;
mp^.tokens := nil;
mp^.readOnly := true;
mp^.algorithm := 1;
bp := pointer(ord4(macros) + hash(mp^.name));
mp^.next := bp^;
bp^ := mp;
new(mp); {__FILE__}
mp^.name := @'__FILE__';
mp^.parameters := -1;
mp^.tokens := nil;
mp^.readOnly := true;
mp^.algorithm := 2;
bp := pointer(ord4(macros) + hash(mp^.name));
mp^.next := bp^;
bp^ := mp;
new(mp); {__DATE__}
mp^.name := @'__DATE__';
mp^.parameters := -1;
mp^.tokens := nil;
mp^.readOnly := true;
mp^.algorithm := 3;
bp := pointer(ord4(macros) + hash(mp^.name));
mp^.next := bp^;
bp^ := mp;
new(mp); {__TIME__}
mp^.name := @'__TIME__';
mp^.parameters := -1;
mp^.tokens := nil;
mp^.readOnly := true;
mp^.algorithm := 4;
bp := pointer(ord4(macros) + hash(mp^.name));
mp^.next := bp^;
bp^ := mp;
new(mp); {__STDC__}
mp^.name := @'__STDC__';
mp^.parameters := -1;
mp^.tokens := nil;
mp^.readOnly := true;
mp^.algorithm := 5;
bp := pointer(ord4(macros) + hash(mp^.name));
mp^.next := bp^;
bp^ := mp;
new(mp); {__ORCAC__}
mp^.name := @'__ORCAC__';
mp^.parameters := -1;
mp^.tokens := nil;
mp^.readOnly := true;
mp^.algorithm := 5;
bp := pointer(ord4(macros) + hash(mp^.name));
mp^.next := bp^;
bp^ := mp;
new(mp); {__VERSION__}
mp^.name := @'__VERSION__';
mp^.parameters := -1;
mp^.tokens := nil;
mp^.readOnly := true;
mp^.algorithm := 6;
bp := pointer(ord4(macros) + hash(mp^.name));
mp^.next := bp^;
bp^ := mp;
SetDateTime; {set up the macro date/time strings}
{set up the version string}
versionStrL := pointer(GMalloc(3 + length(versionStr)));
versionStrL^.length := length(versionStr);
versionStrL^.str := versionStr;
{Scan the command line options}
cp := @infoStringGS.theString.theString;
tokenLine := 0;
tokenColumn := 0;
NextCh;
repeat
while lch in [' ', chr(9)] do {skip leading blanks}
NextCh;
if lch = '-' then begin {see if we have found one}
NextCh;
if lch in ['d','D'] then begin
NextCh; {yes -> get the name}
new(mp); {form the macro table entry}
mp^.name := GetWord;
mp^.parameters := -1;
mp^.tokens := nil;
mp^.readOnly := false;
bp := pointer(ord4(macros) + hash(mp^.name));
mp^.next := bp^;
bp^ := mp;
if lch = '=' then begin
NextCh; {record the value}
token.numString := nil;
if lch in ['a'..'z', 'A'..'Z', '_'] then begin
token.kind := ident;
token.class := identifier;
token.name := GetWord;
token.symbolPtr := nil;
end {if}
else if lch in ['+','-'] then begin
negative := lch = '-';
NextCh;
if lch in ['.','0'..'9'] then begin
token.name := GetWord;
DoNumber(true);
if negative then
case token.class of
intConstant : token.ival := -token.ival;
longConstant : token.lval := -token.lval;
doubleConstant: token.rval := -token.rval;
otherwise: ;
end; {case}
end {if}
else begin
token.kind := intconst;
token.numString := nil;
token.class := intConstant;
token.ival := 0;
end; {else}
end {else if}
else if lch in ['.','0'..'9'] then begin
token.name := GetWord;
DoNumber(true);
end {else if}
else if lch = '"' then
GetString
else
Error(108);
end {if}
else begin
token.kind := intconst; {create the default value}
token.numString := nil;
token.class := intConstant;
token.ival := 1;
end; {else}
new(mp^.tokens); {add the value to the definition}
with mp^.tokens^ do begin
next := nil;
tokenString := nil;
expandEnabled := true;
tokenStart := nil;
tokenEnd := nil;
end; {with}
mp^.tokens^.token := token;
end {if}
else if lch in ['i','I'] then begin
NextCh; {gat the pathname}
if lch = '"' then begin
GetString;
LongToPString(workString, token.sval);
AddPath(workString);
end {if}
else
Error(103);
end {if}
else {not -p, -i: flag the error}
Error(108);
end {if}
else if lch <> chr(0) then begin
Error(108); {unknown option: flag the error}
lch := chr(0);
end; {else}
until lch = chr(0); {if more characters, loop}
end; {InitScanner}
procedure CheckIdentifier;
{ See if an identifier is a reserved word, macro or typedef }
label 1;
var
bPtr: ^macroRecordPtr; {pointer to hash bucket}
mPtr: macroRecordPtr; {for checking list of macros}
rword: tokenEnum; {loop variable}
sp: stringPtr; {for saving identifier names}
lPrintMacroExpansions: boolean; {local copy of printMacroExpansions}
begin {CheckIdentifier}
if expandMacros then {handle macro expansions}
if not skipping then begin
mPtr := FindMacro(@workstring);
if mPtr <> nil then begin
Expand(mPtr);
lPrintMacroExpansions := printMacroExpansions;
printMacroExpansions := false;
NextToken;
printMacroExpansions := lPrintMacroExpansions;
goto 1;
end;
end; {if}
{see if it's a reserved word}
if workString[1] in ['a'..'g','i','l','p','r'..'w'] then
for rword := wordHash[ord(workString[1])-ord('a')] to
pred(wordHash[ord(succ(workString[1]))-ord('a')]) do
if reservedWords[rword] = workString then begin
token.kind := rword;
token.class := reservedWord;
goto 1;
end; {if}
token.symbolPtr := nil; {see if it's a typedef name}
if FindSymbol(token,allSpaces,false,false) <> nil then begin
if token.symbolPtr^.class = typedefsy then
token.kind := typedef;
token.name := token.symbolPtr^.name; {use the old name}
end {if}
else begin {record the name}
sp := pointer(Malloc(length(workString)+1));
CopyString(pointer(sp), @workString);
token.name := sp;
end; {else}
1:
end; {CheckIdentifier}
procedure NextToken;
{ Read the next token from the file. }
label 1,2,3,4;
type
three = (s100,s1000,s4000); {these declarations are used for a}
gstringPtr = ^gstringRecord; { variable length string record }
gstringRecord = record
case three of
s100: (len1: integer;
str1: packed array[1..100] of char;
);
s1000: (len2: integer;
str2: packed array[1..1000] of char;
);
s4000: (len3: integer;
str3: packed array[1..longstringlen] of char;
);
end;
var
done: boolean; {loop termination}
expandEnabled: boolean; {can a token be expanded?}
i: 0..maxint; {loop/index counter}
inhibit: boolean; {inhibit macro expansion?}
lPrintMacroExpansions: boolean; {local copy of printMacroExpansions}
mPtr: macroRecordPtr; {for checking list of macros}
setLength: boolean; {is the current string a p-string?}
tPtr: tokenListRecordPtr; {for removing tokens from putback buffer}
tToken: tokenType; {for merging tokens}
sPtr,tsPtr: gstringPtr; {for forming string constants}
function EscapeCh: integer;
{ Find and return the next character in a string or char }
{ constant. Handle escape sequences if they are found. }
{ (The character is returned as an ordinal value.) }
{ }
{ Globals: }
{ ch - first character in sequence; set to first char }
{ after sequence }
label 1;
var
dig: 0..15; {value of a hex digit}
skipChar: boolean; {get next char when done?}
val: 0..4095; {hex escape code value (scaled to 0..255)}
begin {EscapeCh}
1: skipChar := true;
if ch = '\' then begin
NextCh;
if ch in ['0'..'7','a','b','t','n','v','f','p','r','x'] then
case ch of
'0','1','2','3','4','5','6','7': begin
val := 0;
while ch in ['0'..'7'] do begin
val := (val << 3) | (ord(ch) & 7);
NextCh;
end; {while}
EscapeCh := val & $FF;
skipChar := false;
end;
'a': EscapeCh := 7;
'b': EscapeCh := 8;
't': EscapeCh := 9;
'n': EscapeCh := 10;
'v': EscapeCh := 11;
'f': EscapeCh := 12;
'p': begin
EscapeCh := ord('p');
ispstring := true;
end;
'r': EscapeCh := 13;
'x': begin
val := 0;
NextCh;
while ch in ['0'..'9','a'..'f','A'..'F'] do begin
if ch in ['0'..'9'] then
dig := ord(ch) & $0F
else begin
ch := chr(ord(ch)&$5F);
dig := ord(ch)-ord('A')+10;
end; {else}
val := (val << 4) | dig;
NextCh;
end; {while}
skipChar := false;
EscapeCh := val & $FF;
end;
otherwise: Error(57);
end {case}
else
EscapeCh := ord(ch);
end {if}
else
EscapeCh := ord(ch);
if skipChar then
NextCh;
end; {EscapeCh}
begin {NextToken}
if ifList = nil then {do pending EndInclude calls}
while includeCount <> 0 do begin
EndInclude(includeChPtr);
includeCount := includeCount - 1;
end; {while}
includeChPtr := chPtr;
3:
token.numstring := nil; {wipe out old numstrings}
if tokenList <> nil then begin {get a token put back by a macro}
tPtr := tokenList;
tokenList := tPtr^.next;
expandEnabled := tPtr^.expandEnabled;
token := tPtr^.token;
tokenStart := tPtr^.tokenStart;
tokenEnd := tPtr^.tokenEnd;
dispose(tPtr);
if token.kind = typedef then {allow for typedefs in a macro}
token.kind := ident;
if token.kind = ident then begin
CopyString(@workString, token.name);
CheckIdentifier;
end; {if}
{ dead code
if token.kind = ident then
if FindSymbol(token,allSpaces,false,false) <> nil then
if token.symbolPtr^.class = typedefsy then
token.kind := typedef;
}
4:
while (token.kind = stringconst)
and (tokenList <> nil)
and (tokenList^.token.kind = stringconst) do begin
Merge(token, tokenList^.token);
tPtr := tokenList;
tokenList := tPtr^.next;
dispose(tPtr);
end; {while}
if expandMacros and expandEnabled and (not skipping) then
if token.kind = ident then begin {handle macro expansions}
inhibit := false;
if tokenList <> nil then
if tokenList^.token.kind = poundpoundop then
inhibit := true;
if not inhibit then begin
mPtr := FindMacro(token.name);
if mPtr <> nil then begin
Expand(mPtr);
goto 3;
end; {if}
end; {if}
end; {if}
if tokenList <> nil then
if tokenList^.token.kind = poundpoundop then begin
tPtr := tokenList;
tokenList := tPtr^.next;
dispose(tPtr);
if tokenList <> nil then begin
tPtr := tokenList;
tToken := token;
Merge(tToken, tPtr^.token);
tokenList := tPtr^.next;
token := tToken;
dispose(tPtr);
goto 4;
end; {if}
end; {if}
goto 2;
end; {if}
{skip white space}
while charKinds[ord(ch)] in [illegal,ch_white,ch_eol] do begin
if charKinds[ord(ch)] = illegal then begin
if (ch = '#') and (lastWasReturn or (token.kind = eolsy)) then
PreProcess {call the preprocessor}
else begin
tokenLine := lineNumber; {record a # token}
tokenColumn := ord(ord4(chPtr)-ord4(firstPtr));
tokenStart := pointer(ord4(chPtr)-1);
tokenEnd := chPtr;
if (not skipping) or (not (skipIllegalTokens or (ch = '#'))) then
Error(1);
NextCh;
end; {else}
end {if}
else if (charKinds[ord(ch)] = ch_eol) and reportEOL then begin
token.class := reservedSymbol; {record an eol token}
token.kind := eolsy;
tokenLine := lineNumber;
tokenColumn := ord(ord4(chPtr)-ord4(firstPtr));
tokenStart := pointer(ord4(chPtr)-1);
tokenEnd := chPtr;
NextCh;
goto 2;
end {if}
else begin {skip white space}
if printMacroExpansions then
if charKinds[ord(ch)] = ch_eol then
writeln
else
write(ch);
NextCh;
end;
end; {while}
tokenLine := lineNumber; {record the position of the token}
tokenColumn := ord(ord4(chPtr)-ord4(firstPtr));
tokenStart := pointer(ord4(chPtr)-1);
token.class := reservedSymbol; {default to the most common class}
case charKinds[ord(ch)] of
ch_special : begin
token.kind := charSym[ord(ch)];
NextCh;
end;
ch_eof: {end of file}
token.kind := eofsy;
ch_pound : begin {tokens that start with '#'}
NextCh;
if ch = '#' then begin
token.kind := poundpoundop;
NextCh;
end
else
token.kind := poundch;
end;
ch_dash : begin {tokens that start with '-'}
NextCh;
if ch = '>' then begin
token.kind := minusgtop;
NextCh;
end
else if ch = '-' then begin
token.kind := minusminusop;
NextCh;
end
else if ch = '=' then begin
token.kind := minuseqop;
NextCh;
end
else
token.kind := minusch;
end;
ch_plus : begin {tokens that start with '+'}
NextCh;
if ch = '+' then begin
token.kind := plusplusop;
NextCh;
end
else if ch = '=' then begin
token.kind := pluseqop;
NextCh;
end
else
token.kind := plusch;
end;
ch_lt : begin {tokens that start with '<'}
NextCh;
if ch = '<' then begin
NextCh;
if ch = '=' then begin
token.kind := ltlteqop;
NextCh;
end
else
token.kind := ltltop;
end
else if ch = '=' then begin
token.kind := lteqop;
NextCh;
end
else
token.kind := ltch;
end;
ch_gt : begin {tokens that start with '>'}
NextCh;
if ch = '>' then begin
NextCh;
if ch = '=' then begin
token.kind := gtgteqop;
NextCh;
end
else
token.kind := gtgtop;
end
else if ch = '=' then begin
token.kind := gteqop;
NextCh;
end
else
token.kind := gtch;
end;
ch_eq : begin {tokens that start with '='}
NextCh;
if ch = '=' then begin
token.kind := eqeqop;
NextCh;
end
else
token.kind := eqch;
end;
ch_exc : begin {tokens that start with '!'}
NextCh;
if ch = '=' then begin
token.kind := exceqop;
NextCh;
end
else
token.kind := excch;
end;
ch_and : begin {tokens that start with '&'}
NextCh;
if ch = '&' then begin
token.kind := andandop;
NextCh;
end
else if ch = '=' then begin
token.kind := andeqop;
NextCh;
end
else
token.kind := andch;
end;
ch_bar : begin {tokens that start with '|'}
NextCh;
if ch = '|' then begin
token.kind := barbarop;
NextCh;
end
else if ch = '=' then begin
token.kind := bareqop;
NextCh;
end
else
token.kind := barch;
end;
ch_percent: begin {tokens that start with '%'}
NextCh;
if ch = '=' then begin
token.kind := percenteqop;
NextCh;
end
else
token.kind := percentch;
end;
ch_carot : begin {tokens that start with '^'}
NextCh;
if ch = '=' then begin
token.kind := caroteqop;
NextCh;
end
else
token.kind := carotch;
end;
ch_asterisk: begin {tokens that start with '*'}
NextCh;
if ch = '=' then begin
token.kind := asteriskeqop;
NextCh;
end
else
token.kind := asteriskch;
end;
ch_slash : begin {tokens that start with '/'}
NextCh;
if ch = '=' then begin
token.kind := slasheqop;
NextCh;
end
else
token.kind := slashch;
end;
ch_dot : begin {tokens that start with '.'}
if charKinds[chPtr^] = digit then
DoNumber(false)
else begin
NextCh;
token.kind := dotch;
end; {else}
end;
ch_char : begin {character constants}
NextCh;
token.kind := intconst;
token.class := intConstant;
if ch = '''' then begin
if (not skipping) or (not skipIllegalTokens) then
Error(2);
token.ival := ord(' ');
end {if}
else
token.ival := EscapeCh;
if ch = '''' then
NextCh
else
if (not skipping) or (not skipIllegalTokens) then
Error(2);
end;
ch_string: begin {string constants}
doingstring := true; {change character scanning}
token.kind := stringconst; {set up the token}
token.class := stringConstant;
i := 0; {set up for the string scan}
ispstring := false;
setLength := false;
new(sPtr,s100);
NextCh; {skip the opening "}
{read the characters}
while not (charKinds[ord(ch)] in [ch_string,ch_eol,ch_eof]) do begin
i := i+1;
if i = 101 then begin
sPtr^.len1 := 100;
new(tsPtr,s1000);
CopyLongString(pointer(tsPtr), pointer(sPtr));
dispose(sPtr);
sPtr := tsPtr;
end {if}
else if i = 1001 then begin
sPtr^.len2 := 1000;
new(tsPtr,s4000);
CopyLongString(pointer(tsPtr), pointer(sPtr));
dispose(sPtr);
sPtr := tsPtr;
end {else if}
else if i = longstringlen then begin
i := 1001;
Error(90);
end; {else if}
sPtr^.str1[i] := chr(EscapeCh);
if (i = 1) and ispstring then
setLength := true;
end; {while}
doingstring := false; {process the end of the string}
if ch = '"' then
NextCh
else
Error(3);
if setLength then {check for a p-string}
sPtr^.str1[1] := chr(i-1);
token.ispstring := setLength;
sPtr^.len1 := i; {set the string length}
token.sval := pointer(Malloc(i+3)); {put the string in the string pool}
CopyLongString(token.sval, pointer(sPtr));
dispose(sPtr);
doingstring := false;
token.sval^.str[i+1] := chr(0); {add null in case the string is extended}
end;
letter: begin {reserved words and identifiers}
token.kind := ident;
token.class := identifier;
token.name := @workString;
i := 0;
while charKinds[ord(ch)] in [letter,digit] do begin
i := i+1;
workString[i] := ch;
NextCh;
end; {while}
workString[0] := chr(i);
CheckIdentifier;
end;
digit : {numeric constants}
DoNumber(false);
otherwise: Error(57);
end; {case}
tokenEnd := pointer(ord4(chPtr)-1); {record the end of the token}
2:
if skipping then {conditional compilation branch}
if not (token.kind in [eofsy,eolsy]) then
goto 3;
if token.kind = stringconst then {handle adjacent strings}
repeat
if reportEOL then begin
while charKinds[ord(ch)] = ch_white do
NextCh;
if charKinds[ord(ch)] = ch_eol then
goto 1;
end; {if}
tToken := token;
lPrintMacroExpansions := printMacroExpansions;
printMacroExpansions := false;
NextToken;
printMacroExpansions := lPrintMacroExpansions;
if token.kind = stringconst then begin
Merge(tToken, token);
done := false;
end {if}
else begin
PutBackToken(token, true);
done := true;
end; {else}
token := tToken;
until done;
1:
if printMacroExpansions then {print the token stream}
PrintToken(token);
end; {NextToken}
procedure TermScanner;
{ Shut down the scanner. }
begin {TermScanner}
if ifList <> nil then
Error(21);
if numErr <> 0 then begin {write any pending errors}
firstPtr := chPtr;
WriteLine;
end; {if}
end; {TermScanner}
end.
{$append 'scanner.asm'}
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