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* TODO: break and continue keywords need to be implemented
* TODO: while-then needs testing
* Fixed the parser not liking zero-length strings
This commit is contained in:
Kayne Ruse
2024-11-26 14:48:24 +11:00
parent 0947430c29
commit 6cc331d462
7 changed files with 139 additions and 25 deletions
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70
source/toy_parser.c
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@@ -352,31 +352,33 @@ static Toy_AstFlag literal(Toy_Bucket** bucketHandle, Toy_Parser* parser, Toy_As
case TOY_TOKEN_LITERAL_STRING: {
char buffer[parser->previous.length + 1];
unsigned int escapeCounter = 0;
unsigned int i = 0, o = 0;
do {
buffer[i] = parser->previous.lexeme[o];
if (buffer[i] == '\\' && parser->previous.lexeme[++o]) {
escapeCounter++;
//also handle escape characters
switch(parser->previous.lexeme[o]) {
case 'n':
buffer[i] = '\n';
break;
case 't':
buffer[i] = '\t';
break;
case '\\':
buffer[i] = '\\';
break;
case '"':
buffer[i] = '"';
break;
if (parser->previous.length > 0) { //BUGFIX: compensate for zero-length strings
do {
buffer[i] = parser->previous.lexeme[o];
if (buffer[i] == '\\' && parser->previous.lexeme[++o]) {
escapeCounter++;
//also handle escape characters
switch(parser->previous.lexeme[o]) {
case 'n':
buffer[i] = '\n';
break;
case 't':
buffer[i] = '\t';
break;
case '\\':
buffer[i] = '\\';
break;
case '"':
buffer[i] = '"';
break;
}
}
}
i++;
} while (parser->previous.lexeme[o++] && i < parser->previous.length);
i++;
} while (parser->previous.lexeme[o++] && i < parser->previous.length);
}
buffer[i] = '\0';
unsigned int len = i - escapeCounter; //NOTE: len is ONLY the string length
@@ -699,6 +701,21 @@ static void makeIfThenElseStmt(Toy_Bucket** bucketHandle, Toy_Parser* parser, To
Toy_private_emitAstIfThenElse(bucketHandle, rootHandle, condBranch, thenBranch, elseBranch);
}
static void makeWhileStmt(Toy_Bucket** bucketHandle, Toy_Parser* parser, Toy_Ast** rootHandle) {
Toy_Ast* condBranch = NULL;
Toy_Ast* thenBranch = NULL;
//while (condBranch)
consume(parser, TOY_TOKEN_OPERATOR_PAREN_LEFT, "Expected '(' after 'while' keyword");
makeExpr(bucketHandle, parser, &condBranch);
consume(parser, TOY_TOKEN_OPERATOR_PAREN_RIGHT, "Expected ')' after 'while' condition");
// { thenBranch }
makeDeclarationStmt(bucketHandle, parser, &thenBranch);
Toy_private_emitAstWhileThen(bucketHandle, rootHandle, condBranch, thenBranch);
}
static void makePrintStmt(Toy_Bucket** bucketHandle, Toy_Parser* parser, Toy_Ast** rootHandle) {
makeExpr(bucketHandle, parser, rootHandle);
Toy_private_emitAstPrint(bucketHandle, rootHandle);
@@ -771,10 +788,15 @@ static void makeStmt(Toy_Bucket** bucketHandle, Toy_Parser* parser, Toy_Ast** ro
return;
}
//TODO: break & continue
//while-then
else if (match(parser, TOY_TOKEN_KEYWORD_WHILE)) {
makeWhileStmt(bucketHandle, parser, rootHandle);
return;
}
//for-pre-clause-post-then
//break
//continue
//return
//import