motiejus/zig
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basic support for functions with variable length arguments

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See #77
This commit is contained in:
Andrew Kelley
2017-01-23 16:40:17 -05:00
parent 1826a96160
commit 17cb85dfb8
11 changed files with 258 additions and 64 deletions
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25
src/parser.cpp
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@@ -250,16 +250,11 @@ static AstNode *ast_parse_type_expr(ParseContext *pc, size_t *token_index, bool
}
/*
ParamDecl = option("noalias" | "comptime") option(Symbol ":") TypeExpr | "..."
ParamDecl = option("noalias" | "comptime") option(Symbol ":") (TypeExpr | "...")
*/
static AstNode *ast_parse_param_decl(ParseContext *pc, size_t *token_index) {
Token *token = &pc->tokens->at(*token_index);
if (token->id == TokenIdEllipsis) {
*token_index += 1;
return nullptr;
}
AstNode *node = ast_create_node(pc, NodeTypeParamDecl, token);
if (token->id == TokenIdKeywordNoAlias) {
@@ -282,7 +277,13 @@ static AstNode *ast_parse_param_decl(ParseContext *pc, size_t *token_index) {
}
}
node->data.param_decl.type = ast_parse_type_expr(pc, token_index, true);
Token *ellipsis_tok = &pc->tokens->at(*token_index);
if (ellipsis_tok->id == TokenIdEllipsis) {
*token_index += 1;
node->data.param_decl.is_var_args = true;
} else {
node->data.param_decl.type = ast_parse_type_expr(pc, token_index, true);
}
return node;
}
@@ -304,12 +305,10 @@ static void ast_parse_param_decl_list(ParseContext *pc, size_t *token_index,
for (;;) {
AstNode *param_decl_node = ast_parse_param_decl(pc, token_index);
bool expect_end = false;
if (param_decl_node) {
params->append(param_decl_node);
} else {
*is_var_args = true;
expect_end = true;
}
assert(param_decl_node);
params->append(param_decl_node);
expect_end = param_decl_node->data.param_decl.is_var_args;
*is_var_args = expect_end;
Token *token = &pc->tokens->at(*token_index);
*token_index += 1;