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basic: dialect stuff, error checking (44, 45, 68)

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This commit is contained in:
Steven Hugg 2020-08-08 20:25:58 -05:00
parent bbae87269f
commit a1efa8eebd
2 changed files with 36 additions and 17 deletions
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47
src/common/basic/compiler.ts
View File

@ -400,10 +400,7 @@ export class BASICParser {
if (stmt) stmt.$loc = { line: cmdtok.$loc.line, start: cmdtok.$loc.start, end: this.peekToken().$loc.start };
return stmt;
}
parseVarOrIndexedOrFunc(): IndOp {
return this.parseVarOrIndexed();
}
parseVarOrIndexed(): IndOp {
parseVarSubscriptOrFunc(): IndOp {
var tok = this.consumeToken();
switch (tok.type) {
case TokenType.Ident:
@ -412,27 +409,34 @@ export class BASICParser {
if (this.peekToken().str == '(') {
this.expectToken('(');
args = this.parseExprList();
if (args && args.length > this.opts.maxArguments)
this.compileError(`There can be no more than ${this.opts.maxArguments} arguments to a function or subscript.`);
this.expectToken(')');
}
return { name: tok.str, args: args, $loc: tok.$loc };
default:
this.compileError("Expected variable or array index");
this.compileError(`There should be a variable name here.`);
break;
}
}
parseLexpr(): IndOp {
var lexpr = this.parseVarSubscriptOrFunc();
this.validateVarName(lexpr);
return lexpr;
}
parseList<T>(parseFunc:()=>T, delim:string): T[] {
var sep;
var list = [];
do {
var el = parseFunc.bind(this)()
if (el != null) list.push(el);
sep = this.consumeToken();
var el = parseFunc.bind(this)(); // call parse function
if (el != null) list.push(el); // add parsed element to list
sep = this.consumeToken(); // consume seperator token
} while (sep.str == delim);
this.pushbackToken(sep);
return list;
}
parseLexprList(): IndOp[] {
var list = this.parseList(this.parseVarOrIndexed, ',');
var list = this.parseList(this.parseLexpr, ',');
list.forEach((lexpr) => this.decls[lexpr.name] = this.lasttoken.$loc);
return list;
}
@ -469,7 +473,7 @@ export class BASICParser {
return { op: 'lnot', expr: expr };
} else {
this.pushbackToken(tok);
return this.parseVarOrIndexedOrFunc();
return this.parseVarSubscriptOrFunc();
}
case TokenType.Operator:
if (tok.str == '(') {
@ -515,11 +519,19 @@ export class BASICParser {
parseExpr(): Expr {
return this.parseExpr1(this.parsePrimary(), 0);
}
validateVarName(lexpr: IndOp) {
if (this.opts.strictVarNames) {
if (lexpr.args == null && !/^[A-Z][0-9]?[$]?$/.test(lexpr.name))
this.dialectError(`variable names other than a letter followed by an optional digit`);
if (lexpr.args != null && !/^[A-Z]?[$]?$/.test(lexpr.name))
this.dialectError(`array names other than a single letter`);
}
}
//// STATEMENTS
stmt__LET(): LET_Statement {
var lexpr = this.parseVarOrIndexed();
var lexpr = this.parseLexpr();
this.expectToken("=");
this.decls[lexpr.name] = this.lasttoken.$loc;
var right = this.parseExpr();
@ -569,7 +581,7 @@ export class BASICParser {
return { command: "IF", cond: cond };
}
stmt__FOR() : FOR_Statement {
var lexpr = this.parseVarOrIndexed(); // TODO: parseNumVar()
var lexpr = this.parseLexpr(); // TODO: parseNumVar()
this.expectToken('=');
var init = this.parseExpr();
this.expectToken('TO');
@ -588,7 +600,14 @@ export class BASICParser {
return { command:'NEXT', lexpr:lexpr };
}
stmt__DIM() : DIM_Statement {
return { command:'DIM', args:this.parseLexprList() };
var lexprs = this.parseLexprList();
lexprs.forEach((arr) => {
if (arr.args == null || arr.args.length == 0)
this.compileError(`An array defined by DIM must have at least one dimension.`)
else if (arr.args.length > this.opts.maxDimensions)
this.dialectError(`more than ${this.opts.maxDimensions} dimensional arrays`);
});
return { command:'DIM', args:lexprs };
}
stmt__INPUT() : INPUT_Statement {
var prompt = this.consumeToken();
@ -627,7 +646,7 @@ export class BASICParser {
return { command:'ONGOTO', expr:expr, labels:labels };
}
stmt__DEF() : DEF_Statement {
var lexpr = this.parseVarOrIndexed();
var lexpr = this.parseVarSubscriptOrFunc();
if (!lexpr.name.startsWith('FN')) this.compileError(`Functions defined with DEF must begin with the letters "FN".`)
this.expectToken("=");
this.decls[lexpr.name] = this.lasttoken.$loc;

6
src/common/basic/runtime.ts
View File

@ -358,11 +358,11 @@ export class BASICRuntime {
getArray(name: string, order: number) : [] {
if (!this.arrays[name]) {
if (order == 1)
this.dimArray(name, 11);
this.dimArray(name, this.program.opts.defaultArraySize);
else if (order == 2)
this.dimArray(name, 11, 11);
this.dimArray(name, this.program.opts.defaultArraySize, this.program.opts.defaultArraySize);
else
this.runtimeError(`I only support arrays of one or two dimensions.`)
this.runtimeError(`I only support arrays of one or two dimensions.`); // TODO
}
return this.arrays[name];
}