Experiments/libabacus
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Allow operators to mean different things despite having the same string.

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This commit is contained in:
Danila Fedorin 2018-03-17 18:32:49 -07:00
parent 7ab5eba529
commit 156c02908d
1 changed files with 36 additions and 3 deletions
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39
src/parser.c
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@ -854,6 +854,34 @@ libab_result _parser_expression_tree(struct parser_state* state, ll* source, lib
return result;
}
int _parser_match_is_postfix_op(struct parser_state* state, libab_lexer_match* match) {
int is_postfix = 0;
if(match->type == TOKEN_OP_POSTFIX) {
is_postfix = 1;
} else {
libab_operator* operator;
char op_buffer[8];
_parser_extract_token_buffer(state, op_buffer, 8, match);
operator = libab_table_search_operator(state->base_table, op_buffer, TOKEN_OP_POSTFIX);
if(operator) is_postfix = 1;
}
return is_postfix;
}
int _parser_match_is_prefix_op(struct parser_state* state, libab_lexer_match* match) {
int is_prefix = 0;
if(match->type == TOKEN_OP_PREFIX) {
is_prefix = 1;
} else {
libab_operator* operator;
char op_buffer[8];
_parser_extract_token_buffer(state, op_buffer, 8, match);
operator = libab_table_search_operator(state->base_table, op_buffer, TOKEN_OP_PREFIX);
if(operator) is_prefix = 1;
}
return is_prefix;
}
int _parser_match_is_infix_op(struct parser_state* state, libab_lexer_match* match) {
int is_infix = 0;
if(match->type == TOKEN_OP_INFIX || match->type == TOKEN_OP_RESERVED) {
@ -904,16 +932,21 @@ libab_result _parse_expression(struct parser_state* state, libab_tree** store_in
} else {
break;
}
} else if(new_token->type == TOKEN_OP_PREFIX && _parser_can_prefix_follow(last_type)) {
} else if(_parser_match_is_prefix_op(state, new_token) &&
_parser_can_prefix_follow(last_type)) {
new_token->type = TOKEN_OP_PREFIX;
result = libab_convert_ds_result(ll_append(&op_stack, new_token));
if(result != LIBAB_SUCCESS) break;
_parser_state_step(state);
new_type = EXPR_OP_PREFIX;
} else if(new_token->type == TOKEN_OP_POSTFIX && _parser_can_postfix_follow(last_type)) {
} else if(_parser_match_is_postfix_op(state, new_token) &&
_parser_can_postfix_follow(last_type)) {
new_token->type = TOKEN_OP_POSTFIX;
result = _parser_append_op_node(state, new_token, &out_stack);
_parser_state_step(state);
new_type = EXPR_OP_POSTFIX;
} else if(new_token->type == TOKEN_OP_INFIX || new_token->type == TOKEN_OP_RESERVED) {
} else if(_parser_match_is_infix_op(state, new_token)) {
new_token->type = TOKEN_OP_INFIX;
_parser_find_operator_infix(state, new_token, &operator);
_parser_state_step(state);