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Allow for stmt to have empty clauses, resolved #58

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This commit is contained in:
Kayne Ruse
2023-02-13 14:42:43 +00:00
parent eb8e522bf2
commit 1ed114b80d
8 changed files with 58 additions and 7 deletions
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33
source/toy_parser.c
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@@ -1350,13 +1350,36 @@ static void forStmt(Toy_Parser* parser, Toy_ASTNode** nodeHandle) {
//read the clauses
consume(parser, TOY_TOKEN_PAREN_LEFT, "Expected '(' at beginning of for clause");
declaration(parser, &preClause); //allow defining variables in the pre-clause
//check the pre-clause
if (parser->current.type != TOY_TOKEN_SEMICOLON) {
declaration(parser, &preClause); //allow defining variables in the pre-clause
}
else {
consume(parser, TOY_TOKEN_SEMICOLON, "Expected ';' after empty declaration of for clause");
Toy_emitASTNodePass(&preClause);
}
parsePrecedence(parser, &condition, PREC_TERNARY);
consume(parser, TOY_TOKEN_SEMICOLON, "Expected ';' after condition of for clause");
//check the condition clause
if (parser->current.type != TOY_TOKEN_SEMICOLON) {
parsePrecedence(parser, &condition, PREC_TERNARY);
consume(parser, TOY_TOKEN_SEMICOLON, "Expected ';' after condition of for clause");
}
else {
consume(parser, TOY_TOKEN_SEMICOLON, "Expected ';' after empty condition of for clause");
//empty clause defaults to forever
Toy_Literal f = TOY_TO_BOOLEAN_LITERAL(true);
Toy_emitASTNodeLiteral(&condition, f);
}
parsePrecedence(parser, &postClause, PREC_ASSIGNMENT);
consume(parser, TOY_TOKEN_PAREN_RIGHT, "Expected ')' at end of for clause");
//check the postfix clause
if (parser->current.type != TOY_TOKEN_PAREN_RIGHT) {
parsePrecedence(parser, &postClause, PREC_ASSIGNMENT);
consume(parser, TOY_TOKEN_PAREN_RIGHT, "Expected ')' at end of for clause");
}
else {
consume(parser, TOY_TOKEN_PAREN_RIGHT, "Expected ')' after empty increment of for clause");
Toy_emitASTNodePass(&postClause);
}
//read the path
declaration(parser, &thenPath);