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switch statements resolve peer compatibility

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This commit is contained in:
Andrew Kelley
2016-02-04 15:50:06 -07:00
parent fcbeaddbb2
commit 5490f907fe
4 changed files with 38 additions and 13 deletions
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12
src/parser.cpp
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@@ -1834,7 +1834,7 @@ static AstNode *ast_parse_for_expr(ParseContext *pc, int *token_index, bool mand
/*
SwitchExpression : "switch" "(" Expression ")" "{" many(SwitchProng) "}"
SwitchProng : (list(SwitchItem, ",") | "else") option("," "(" "Symbol" ")") "=>" Expression ","
SwitchProng = (list(SwitchItem, ",") | "else") "=>" option("|" "Symbol" "|") Expression ","
SwitchItem : Expression | (Expression "..." Expression)
*/
static AstNode *ast_parse_switch_expr(ParseContext *pc, int *token_index, bool mandatory) {
@@ -1895,15 +1895,15 @@ static AstNode *ast_parse_switch_expr(ParseContext *pc, int *token_index, bool m
break;
}
Token *arrow_or_colon = &pc->tokens->at(*token_index);
if (arrow_or_colon->id == TokenIdColon) {
ast_eat_token(pc, token_index, TokenIdFatArrow);
Token *maybe_bar = &pc->tokens->at(*token_index);
if (maybe_bar->id == TokenIdBinOr) {
*token_index += 1;
ast_eat_token(pc, token_index, TokenIdLParen);
prong_node->data.switch_prong.var_symbol = ast_parse_symbol(pc, token_index);
ast_eat_token(pc, token_index, TokenIdRParen);
ast_eat_token(pc, token_index, TokenIdBinOr);
}
ast_eat_token(pc, token_index, TokenIdFatArrow);
prong_node->data.switch_prong.expr = ast_parse_expression(pc, token_index, true);
ast_eat_token(pc, token_index, TokenIdComma);