Experiments/libabacus
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Add a macro to considerably simplify child parsing code.

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This commit is contained in:
Danila Fedorin 2018-02-27 11:29:59 -08:00
parent 127a59ba50
commit c8ec93880e
1 changed files with 32 additions and 44 deletions
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76
src/parser.c
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@ -14,6 +14,16 @@ struct parser_state {
};
// Utilities
#define PARSE_CHILD(result, state, parse_function, parse_into, into) do {\
result = parse_function(state, &parse_into);\
if(result == LIBAB_SUCCESS) {\
result = libab_convert_ds_result(vec_add(into, parse_into));\
if(result != LIBAB_SUCCESS) {\
libab_tree_free_recursive(parse_into);\
}\
}\
} while(0);
int _parser_foreach_free_tree(void* data, va_list args) {
libab_tree_free(data);
free(data);
@ -154,6 +164,16 @@ libab_result _parser_construct_node_both(struct parser_state* state, libab_lexer
return result;
}
libab_result _parse_void(struct parser_state* state, libab_tree** store_into) {
libab_result result = LIBAB_SUCCESS;
if((*store_into = malloc(sizeof(**store_into)))) {
(*store_into)->variant = VOID;
} else {
result = LIBAB_MALLOC;
}
return result;
}
libab_result _parse_if(struct parser_state* state, libab_tree** store_into) {
libab_result result = LIBAB_SUCCESS;
libab_tree* condition = NULL;
@ -175,7 +195,8 @@ libab_result _parse_if(struct parser_state* state, libab_tree** store_into) {
}
if(result == LIBAB_SUCCESS) {
result = _parse_expression(state, &condition);
PARSE_CHILD(result, state, _parse_expression,
condition, &(*store_into)->children);
}
if(result == LIBAB_SUCCESS) {
@ -183,36 +204,23 @@ libab_result _parse_if(struct parser_state* state, libab_tree** store_into) {
}
if(result == LIBAB_SUCCESS) {
result = _parse_expression(state, &if_branch);
PARSE_CHILD(result, state, _parse_expression,
if_branch, &(*store_into)->children);
}
if(result == LIBAB_SUCCESS) {
if(_parser_is_type(state, TOKEN_KW_ELSE)) {
_parser_state_step(state);
result = _parse_expression(state, &else_branch);
PARSE_CHILD(result, state, _parse_expression,
else_branch, &(*store_into)->children);
} else {
result = _parser_allocate_node(state->last_match, &else_branch);
if(result == LIBAB_SUCCESS) else_branch->variant = VOID;
}
}
if(result == LIBAB_SUCCESS) {
result = libab_convert_ds_result(vec_add(&(*store_into)->children, condition));
if(result == LIBAB_SUCCESS) {
result = libab_convert_ds_result(vec_add(&(*store_into)->children, if_branch));
}
if(result == LIBAB_SUCCESS) {
result = libab_convert_ds_result(vec_add(&(*store_into)->children, else_branch));
PARSE_CHILD(result, state, _parse_void,
else_branch, &(*store_into)->children);
}
}
if(result != LIBAB_SUCCESS) {
if(condition) libab_tree_free_recursive(condition);
if(if_branch) libab_tree_free_recursive(if_branch);
if(else_branch) libab_tree_free_recursive(else_branch);
if(*store_into) libab_tree_free(*store_into);
free(*store_into);
if(*store_into) libab_tree_free_recursive(*store_into);
*store_into = NULL;
}
@ -234,13 +242,7 @@ libab_result _parse_call(struct parser_state* state, libab_tree** store_into) {
}
while(result == LIBAB_SUCCESS && !_parser_eof(state) && !_parser_is_char(state, ')')) {
result = _parse_expression(state, &temp);
if(result == LIBAB_SUCCESS) {
result = libab_convert_ds_result(vec_add(&(*store_into)->children, temp));
if(result != LIBAB_SUCCESS) {
libab_tree_free_recursive(temp);
}
}
PARSE_CHILD(result, state, _parse_expression, temp, &(*store_into)->children);
if(result == LIBAB_SUCCESS && !(_parser_is_char(state, ')') || _parser_is_char(state, ','))) {
result = LIBAB_UNEXPECTED;
@ -545,13 +547,7 @@ libab_result _parse_block(struct parser_state* state,
while(result == LIBAB_SUCCESS &&
!_parser_eof(state) &&
!(expect_braces && _parser_is_char(state, '}'))) {
result = _parse_expression(state, &temp);
if(result == LIBAB_SUCCESS) {
result = libab_convert_ds_result(vec_add(&(*store_into)->children, temp));
if(result != LIBAB_SUCCESS) {
libab_tree_free_recursive(temp);
}
}
PARSE_CHILD(result, state, _parse_expression, temp, &(*store_into)->children);
if(_parser_is_char(state, ';')) {
temp = NULL;
_parser_state_step(state);
@ -559,15 +555,7 @@ libab_result _parse_block(struct parser_state* state,
}
if(result == LIBAB_SUCCESS && temp == NULL) {
result = _parser_allocate_node(state->last_match, &temp);
if(result == LIBAB_SUCCESS) {
temp->variant = VOID;
result = libab_convert_ds_result(vec_add(&(*store_into)->children, temp));
if(result != LIBAB_SUCCESS) {
free(temp);
}
}
PARSE_CHILD(result, state, _parse_void, temp, &(*store_into)->children);
}
if(expect_braces && result == LIBAB_SUCCESS) result = _parser_consume_char(state, '}');