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when finishing an array-indexing operation the parser now calls rotate_entfield_array_index_nodes to fixup 'ent.foo[n]' to become 'ent.(foo[n])'

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Wolfgang (Blub) Bumiller 2012-11-13 00:39:39 +01:00
parent 6044079528
commit b0326c66ed
1 changed files with 37 additions and 0 deletions
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37
parser.c
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@ -380,6 +380,42 @@ static sy_elem syparen(lex_ctx ctx, int p, size_t off) {
# define DEBUGSHUNTDO(x)
#endif
/* With regular precedence rules, ent.foo[n] is the same as (ent.foo)[n],
* so we need to rotate it to become ent.(foo[n]).
*/
static void rotate_entfield_array_index_nodes(ast_expression **out)
{
ast_array_index *index;
ast_entfield *entfield;
ast_value *field;
ast_expression *sub;
ast_expression *entity;
lex_ctx ctx = ast_ctx(*out);
if (!ast_istype(*out, ast_array_index))
return;
index = (ast_array_index*)*out;
if (!ast_istype(index->array, ast_entfield))
return;
entfield = (ast_entfield*)index->array;
if (!ast_istype(entfield->field, ast_value))
return;
field = (ast_value*)entfield->field;
sub = index->index;
entity = entfield->entity;
ast_delete(index);
index = ast_array_index_new(ctx, (ast_expression*)field, sub);
entfield = ast_entfield_new(ctx, entity, (ast_expression*)index);
*out = (ast_expression*)entfield;
}
static bool parser_sy_pop(parser_t *parser, shunt *sy)
{
const oper_info *op;
@ -478,6 +514,7 @@ static bool parser_sy_pop(parser_t *parser, shunt *sy)
return false;
}
out = (ast_expression*)ast_array_index_new(ctx, exprs[0], exprs[1]);
rotate_entfield_array_index_nodes(&out);
break;
case opid1(','):