mirror of
https://github.com/RevCurtisP/C02.git
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399 lines
9.3 KiB
C
399 lines
9.3 KiB
C
/*************************************
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* C02 Input File Parsing Routines *
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*************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include <errno.h>
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#include "common.h"
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#include "files.h"
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#include "parse.h"
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char opstr[2]; //Operator as a String
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/* Various tests against nxtchr */
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int match(char c) {return TF(nxtchr == c);}
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int inbtwn(char mn, char mx) {return TF(nxtchr >= mn && nxtchr <= mx);}
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int isprnt() {return isprint(nxtchr);}
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int isalph() {return isalpha(nxtchr);}
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int isanum() {return isalnum(nxtchr);}
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int isdec() {return inbtwn('0', '9');}
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int ishexd() {return TF(isdec() || inbtwn('A', 'Z'));}
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int isbin() {return inbtwn('0', '1');}
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int isnl() {return TF(match('\n') || match('\r'));}
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int isspc() {return isspace(nxtchr);}
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int isnpre() {return TF(isdec() || match('$') || match('%'));}
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int isapos() {return match('\'');}
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int iscpre() {return TF(isnpre() || isapos());}
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int isvpre() {return TF(isalph() || iscpre());}
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int isoper() {return TF(strchr("+-&|^", nxtchr));}
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int ispopr() {return TF(strchr("+-<>", nxtchr));}
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/* if Word is s then return TRUE else return FALSE*/
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int wordis(char *s)
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{
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return strcmp(word, s) == 0;
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}
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/* Get Next Character from Current Input File *
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* Uses: inpfil - Input File Handle *
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* Sets: nxtchr - Next Character in Source File */
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char getnxt()
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{
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int i;
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int wascr = match('\r');
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char c = nxtchr;
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//if (nxtwrd[nxtptr]) //If nxtwrd is set
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// nxtchr = nxtwrd[nxtptr++]; // Pop First Character from nxtwrd
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//else
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nxtchr = fgetc(inpfil);
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nxtupc = toupper(nxtchr);
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if (wascr && match('\n')) return c; //Skip NL after CR
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if (isnl()) curcol=1; else curcol++;
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if (curcol == 1) curlin++;
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return c;
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}
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/* Advance Input File to next printable character */
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void skpspc()
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{
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//DEBUG("Skipping Spaces\n", 0);
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while (isspc())
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getnxt();
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}
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/* Check if the next printable character is c *
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* and advance past it if it is *
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* Returns TRUE is character is found, *
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* otherwise FALSE */
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int look(char c)
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{
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int found;
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skpspc();
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found = match(c);
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if (found) {
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skpchr();
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CCMNT(c);
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}
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return found;
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}
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/* if next printable character is c then skip, else generate error */
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void expect(char c)
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{
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if (look(c))
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return;
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else {
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printf("Expected Character '%c', but found '%c'\n", c, nxtchr);
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exterr(EXIT_FAILURE);
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}
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}
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/* Advance Input File to next printable character */
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void skpchr() {char skip = getnxt();}
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/* Advance Input File to end of line */
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void skpeol() {while (!isnl()) getnxt();}
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/* Advance Source File to end of comment *
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* Recognizes both C and C++ style comments */
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void skpcmt()
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{
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DEBUG("Skipping Comment\n", 0);
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skpchr(); //skip initial /
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if (match('/')) //if C style comment
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skpeol(); // skip rest of line
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else if (match('*')) //if C++ style comment
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while (TRUE) // skip to */
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{
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skpchr();
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if (!match('*')) continue;
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while (match('*')) skpchr();
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if (!match('/')) continue;
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skpchr();
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break;
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//todo: add code to catch unterminated comment
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}
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else //if neither
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expctd("/ or *"); // error out
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}
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/* Reads next Word in current Input File, where *
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* a Word is a sequence of AlphaNumeric characters *
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* Sets: word - the Word read from the source file */
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void getwrd()
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{
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int wrdlen = 0;
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skpspc();
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if (!isalph()) expctd("Alphabetic Character");
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while (isanum())
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{
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word[wrdlen++] = getnxt();
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}
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word[wrdlen] = 0;
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}
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/* Get Definition Text */
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void getdef()
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{
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int wrdlen = 0;
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skpspc();
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while (isprnt()) {
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word[wrdlen++] = getnxt();
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}
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word[wrdlen] = 0;
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}
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/* Process define directive */
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void prsdef()
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{
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getwrd(); //get defined identifier
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DEBUG("Defining '%s'\n", word);
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strncpy(defnam[defcnt], word, VARLEN);
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getdef();
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DEBUG("Defined as '%s'\n", word);
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strncat(deftxt[defcnt], word, DEFLEN);
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defcnt++;
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}
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/* Check for and Expand DEFINE *
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* Sets: nxtwrd, nxtchr, nxtupr *
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* if match is found */
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void expdef()
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{
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int i;
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if (!isalph()) return;
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DEBUG("Checking for definition '%s'\n", word);
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nxtptr = 0;
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for (i=0; i<defcnt; i++) {
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if (strcmp(word, defnam[i]) == 0) {
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strcpy(nxtwrd, deftxt[i]);
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nxtchr = nxtwrd[0];
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nxtupc = toupper(nxtchr);
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DEBUG("Expanded to '%s'\n", word);
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return;
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}
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}
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strcpy(nxtwrd, word);
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}
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char escape(char c)
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{
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DEBUG("Escaping character '%c'\n", c);
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switch (c) {
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case 'r': return 0x0d;
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default: return c;
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}
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}
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/* Get String */
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void getstr() {
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char strdel, tmpchr;
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int wrdlen = 0, escnxt = FALSE;
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DEBUG("Parsing string\n", 0);
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strdel = getnxt(); //Get String Delimiter
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CCMNT(strdel);
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while(match(strdel) == escnxt) {
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CCMNT(nxtchr);
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if (escnxt) {
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word[wrdlen++] = escape(getnxt());
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escnxt = FALSE;
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}
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else {
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if (match('\\'))
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escnxt = TRUE;
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else
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word[wrdlen++] = nxtchr;
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skpchr();
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}
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}
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skpchr(); //Skip End Delimiter
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CCMNT(strdel);
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word[wrdlen++] = 0;
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}
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/* Read Binary number from input file *
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* a Binary is a series of binary digits (0 or 1) *
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* prefixed with '%' *
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* Sets: word - binary number including leading '%' *
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* Returns: integer value of number */
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int prsbin()
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{
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int wrdlen = 0;
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int digit;
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int number = 0;
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if (!match('%'))
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expctd("hexadecimal number");
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word[wrdlen++] = nxtchr;
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getnxt();
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while (isbin()) {
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word[wrdlen++] = nxtchr;
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digit = nxtchr - '0';
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number = number * 2 + digit;
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skpchr();
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}
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word[wrdlen] = 0;
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return (number);
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}
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/* Read Decimal number from input file *
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* a Decimal is a series of digits (0-9) *
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* Sets: word - number without leading 0's *
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* Returns: integer value of number */
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int prsdec()
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{
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int wrdlen = 0;
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int digit;
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int number = 0;
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if (!isdec()) expctd("Digit");
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while (isdec())
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{
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if (!match('0') || number != 0) //skip leading zeros
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word[wrdlen++] = nxtchr;
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digit = getnxt() - '0';
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number = number * 10 + digit;
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}
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if (number == 0) word[wrdlen++] = '0';
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word[wrdlen] = 0;
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return(number);
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}
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/* Reads Hexadecimal number from input file *
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* Sets: word - Hex number including leading '$' *
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* Returns: integer value of number */
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int prshex()
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{
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int wrdlen = 0;
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int digit;
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int number = 0;
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DEBUG("Parsing hexadecimal constant\n", 0);
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if (!match('$'))
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expctd("hexadecimal number");
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word[wrdlen++] = getnxt();
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while (ishexd()) {
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DEBUG("Found hex digit '%c'\n", nxtchr);
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word[wrdlen++] = nxtchr;
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if (isdec())
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digit = nxtchr - '0';
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else
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digit = nxtchr - 'A' + 10;
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number = number * 16 + digit;
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skpchr();
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}
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word[wrdlen] = 0;
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return (number);
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}
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/* Reads Character constant from input file *
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* Sets: word - Character constant including *
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* single quotes *
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* Returns: ASCII value of constant */
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int prschr()
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{
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int wrdlen = 0;
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char c;
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DEBUG("Parsing character constant\n", 0);
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expect('\'');
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word[wrdlen++] = '\'';
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if (match('\\'))
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word[wrdlen++] = getnxt();
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c = getnxt();
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DEBUG("Extracted character %c\n", c);
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word[wrdlen++] = c;
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expect('\'');
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word[wrdlen++] = '\'';
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word[wrdlen] = 0;
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return (int)c;
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}
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/* Parse numeric value *
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* Args: maxval - maximum allowed value *
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* Sets: value - parsed number (as string) *
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* Returns: parsed number */
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int prsnum(int maxval)
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{
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int number;
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skpspc();
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if (!iscpre()) expctd("constant value");
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switch(nxtchr) {
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case '%':
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number = prsbin();
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break;
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case '$':
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number = prshex();
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break;
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case '\'':
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number = prschr();
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break;
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default:
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number = prsdec();
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}
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DEBUG("Parsed number '%s'\n", word);
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DEBUG("with value '%d'\n", number);
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if (number > maxval) {
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ERROR("Out of bounds constant '%d';\n", number, EXIT_FAILURE);
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}
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if (maxval > 255)
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sprintf(value, "$%04X", number);
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else
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sprintf(value, "$%02X", number);
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return number;
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}
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/* Parse numeric constant *
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* Args: maxval - maximum allowed value *
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* Sets: value - the constant (as a string) *
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* valtyp - value type (CONSTANT) */
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void prscon(int maxval)
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{
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cnstnt = prsnum(maxval);
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valtyp = CONSTANT;
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if (maxval > 255)
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sprintf(value, "#$%04X", cnstnt);
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else
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sprintf(value, "#$%02X", cnstnt);
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DEBUG("Generated constant '%s'\n", value);
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ACMNT(word);
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}
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/* Get Value Type */
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int gettyp()
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{
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if (match('(')) return FUNCTION;
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else if (match('[')) return ARRAY;
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else return VARIABLE;
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}
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/* Parse next word as variable or function name *
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* Sets: value - Identifier Name *
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* valtyp - Identifier Type */
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void prsvar()
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{
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getwrd();
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valtyp = gettyp();
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if (valtyp != FUNCTION) chksym(word);
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strcpy(value, word);
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DEBUG("Parsed variable '%s'\n", value);
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ACMNT(word);
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}
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/* Parse arithmetic or bitwise operator */
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void prsopr()
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{
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if (!isoper)
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expctd("Arithmetic or bitwise operator");
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oper = getnxt();
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DEBUG("Parsed operator '%c'\n", oper);
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opstr[0] = oper;
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opstr[1] = 0;
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ACMNT(opstr);
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skpspc();
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}
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