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introduce [*] for unknown length pointers

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See #770

Currently it does not have any different behavior than `*`
but it is now recommended to use `[*]` for unknown length
pointers to be future-proof.

Instead of [ * ] being separate tokens as the proposal
suggested, this commit implements `[*]` as a single token.
This commit is contained in:
Andrew Kelley
2018-06-02 04:03:25 -04:00
parent 7b386ea242
commit f06bce5dda
9 changed files with 87 additions and 12 deletions
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5
src/parser.cpp
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@@ -1174,6 +1174,7 @@ static PrefixOp tok_to_prefix_op(Token *token) {
static AstNode *ast_parse_pointer_type(ParseContext *pc, size_t *token_index, Token *star_tok) {
AstNode *node = ast_create_node(pc, NodeTypePointerType, star_tok);
node->data.pointer_type.star_token = star_tok;
Token *token = &pc->tokens->at(*token_index);
if (token->id == TokenIdKeywordAlign) {
@@ -1211,11 +1212,11 @@ static AstNode *ast_parse_pointer_type(ParseContext *pc, size_t *token_index, To
/*
PrefixOpExpression = PrefixOp ErrorSetExpr | SuffixOpExpression
PrefixOp = "!" | "-" | "~" | ("*" option("align" "(" Expression option(":" Integer ":" Integer) ")" ) option("const") option("volatile")) | "?" | "??" | "-%" | "try" | "await"
PrefixOp = "!" | "-" | "~" | (("*" | "[*]") option("align" "(" Expression option(":" Integer ":" Integer) ")" ) option("const") option("volatile")) | "?" | "??" | "-%" | "try" | "await"
*/
static AstNode *ast_parse_prefix_op_expr(ParseContext *pc, size_t *token_index, bool mandatory) {
Token *token = &pc->tokens->at(*token_index);
if (token->id == TokenIdStar) {
if (token->id == TokenIdStar || token->id == TokenIdBracketStarBracket) {
*token_index += 1;
return ast_parse_pointer_type(pc, token_index, token);
}