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IR: support inline switch

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This commit is contained in:
Andrew Kelley
2016-11-26 15:38:07 -05:00
parent 24b65e41ee
commit 4619b5de06
5 changed files with 68 additions and 11 deletions
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29
src/parser.cpp
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@@ -1642,23 +1642,36 @@ static AstNode *ast_parse_for_expr(ParseContext *pc, size_t *token_index, bool m
}
/*
SwitchExpression : "switch" "(" Expression ")" "{" many(SwitchProng) "}"
SwitchExpression = option("inline") "switch" "(" Expression ")" "{" many(SwitchProng) "}"
SwitchProng = (list(SwitchItem, ",") | "else") "=>" option("|" option("*") Symbol "|") Expression ","
SwitchItem : Expression | (Expression "..." Expression)
*/
static AstNode *ast_parse_switch_expr(ParseContext *pc, size_t *token_index, bool mandatory) {
Token *token = &pc->tokens->at(*token_index);
if (token->id != TokenIdKeywordSwitch) {
if (mandatory) {
ast_expect_token(pc, token, TokenIdKeywordSwitch);
Token *first_token = &pc->tokens->at(*token_index);
Token *switch_token;
bool is_inline;
if (first_token->id == TokenIdKeywordInline) {
is_inline = true;
switch_token = &pc->tokens->at(*token_index + 1);
if (switch_token->id == TokenIdKeywordSwitch) {
*token_index += 2;
} else if (mandatory) {
ast_expect_token(pc, first_token, TokenIdKeywordSwitch);
} else {
return nullptr;
}
} else if (first_token->id == TokenIdKeywordSwitch) {
is_inline = false;
switch_token = first_token;
*token_index += 1;
} else if (mandatory) {
ast_expect_token(pc, first_token, TokenIdKeywordSwitch);
} else {
return nullptr;
}
*token_index += 1;
AstNode *node = ast_create_node(pc, NodeTypeSwitchExpr, token);
AstNode *node = ast_create_node(pc, NodeTypeSwitchExpr, switch_token);
node->data.switch_expr.is_inline = is_inline;
ast_eat_token(pc, token_index, TokenIdLParen);
node->data.switch_expr.expr = ast_parse_expression(pc, token_index, true);