Implement pattern compilation and freeing.
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d8ddaa8b45
commit
ee40622ceb
288
src/pattern.c
288
src/pattern.c
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@ -1,6 +1,9 @@
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#include "pattern.h"
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#include <stdlib.h>
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#include <string.h>
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#include <pattern.h>
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#include "sprs.h"
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#include "ll.h"
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void _pattern_node_clear(pattern_node* to_clear){
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to_clear->type = PNODE_CLEAR;
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@ -135,3 +138,288 @@ void _pattern_chain_append_chain(pattern_chain* append_to, pattern_chain* to_app
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}
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}
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}
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int _pattern_node_foreach_free(void* node, va_list args){
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free(node);
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return 0;
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}
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void _pattern_node_find_all(pattern_node* node, sprs* set){
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if(node && !sprs_contains(set, node->id)){
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sprs_put(set, node->id, node);
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if(node->type == PNODE_ANY) {
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_pattern_node_find_all(node->data_u.any_s.next, set);
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} else if(node->type == PNODE_CONNECT){
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_pattern_node_find_all(node->data_u.connect_s.next, set);
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} else if(node->type == PNODE_FORK){
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_pattern_node_find_all(node->data_u.fork_s.left, set);
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_pattern_node_find_all(node->data_u.fork_s.right, set);
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} else if(node->type == PNODE_RANGE){
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_pattern_node_find_all(node->data_u.range_s.next, set);
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} else if(node->type == PNODE_VALUE){
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_pattern_node_find_all(node->data_u.value_s.next, set);
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}
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}
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}
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liblex_result _pattern_free(pattern_node* root, int size){
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sprs set;
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liblex_result result;
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sprs_init(&set);
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result = (sprs_setup(&set, size) == LIBDS_SUCCESS) ? LIBLEX_SUCCESS : LIBLEX_MALLOC;
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if(result == LIBLEX_SUCCESS){
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_pattern_node_find_all(root, &set);
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sprs_foreach(&set, NULL, compare_always, _pattern_node_foreach_free);
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}
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sprs_free(&set);
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return result;
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}
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liblex_result _pattern_read_value(char* read_into, char* string, int* index){
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liblex_result result = LIBLEX_SUCCESS;
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if(string[*index] == '\\'){
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(*index)++;
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}
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if(string[*index]) {
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*read_into = string[*index];
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(*index)++;
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} else {
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result = LIBLEX_INVALID;
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}
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return result;
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}
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liblex_result _pattern_build_or(pattern_chain** into, int* ids, char* string, int* index) {
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pattern_node *tail_node;
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liblex_result result = LIBLEX_SUCCESS;
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result = _pattern_node_create_connect(&tail_node, (*ids)++, NULL);
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if (result == LIBLEX_SUCCESS) {
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result = _pattern_chain_create(into, NULL, tail_node);
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}
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while (string[*index] && string[*index] != ']' && result == LIBLEX_SUCCESS) {
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char from = '\0';
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char to = '\0';
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pattern_node *new_node = NULL;
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pattern_node *fork_node = NULL;
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pattern_node *add_node = NULL;
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result = _pattern_read_value(&from, string, index);
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if (result == LIBLEX_SUCCESS) {
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if (string[*index] == '-') {
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(*index)++;
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result = _pattern_read_value(&to, string, index);
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}
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}
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if (result == LIBLEX_SUCCESS) {
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if (to) {
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result = _pattern_node_create_range(&new_node, (*ids)++, from, to, tail_node);
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} else {
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result = _pattern_node_create_value(&new_node, (*ids)++, from, tail_node);
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}
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add_node = new_node;
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}
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if (result == LIBLEX_SUCCESS && (*into)->head) {
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result = _pattern_node_create_fork(&fork_node, (*ids)++, (*into)->head, new_node);
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if (result == LIBLEX_SUCCESS) {
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add_node = fork_node;
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}
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}
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if (result == LIBLEX_SUCCESS) {
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(*into)->head = add_node;
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} else {
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free(new_node);
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free(fork_node);
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}
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}
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if (result != LIBLEX_SUCCESS) {
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if (*into && (*into)->head) {
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_pattern_free((*into)->head, *ids);
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} else {
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free(tail_node);
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}
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free(*into);
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}
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return result;
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}
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void _pattern_chain_append_chain_discard(pattern_chain* append_to, pattern_chain** to_append){
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_pattern_chain_append_chain(append_to, *to_append);
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free(*to_append);
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*to_append = NULL;
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}
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liblex_result _pattern_build_chain(pattern_chain** into, int* ids, char* string, int* index){
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liblex_result result = LIBLEX_SUCCESS;
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ll or_stack;
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pattern_chain* current_chain = NULL;
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pattern_chain* sub_chain = NULL;
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int is_subchain = (*index > -1) && (string[*index] == '(');
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ll_init(&or_stack);
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result = _pattern_chain_create(¤t_chain, NULL, NULL);
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if(result == LIBLEX_SUCCESS){
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(*index)++;
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}
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while(string[*index] && string[*index] != ')' && result == LIBLEX_SUCCESS){
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if(string[*index] == '('){
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_pattern_chain_append_chain_discard(current_chain, &sub_chain);
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result = _pattern_build_chain(&sub_chain, ids, string, index);
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} else if(string[*index] == '['){
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_pattern_chain_append_chain_discard(current_chain, &sub_chain);
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result = _pattern_build_or(&sub_chain, ids, string, index);
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} else if(string[*index] == '?' || string[*index] == '*' || string[*index] == '+'){
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if(sub_chain != NULL && sub_chain->head){
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pattern_node* connection_node = NULL;
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pattern_node* fork_node = NULL;
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result = _pattern_node_create_connect(&connection_node, (*ids)++, NULL);
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if(result == LIBLEX_SUCCESS){
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result = _pattern_node_create_fork(&fork_node, (*ids)++, sub_chain->head, connection_node);
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}
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if(result == LIBLEX_SUCCESS){
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pattern_node** next_node = _pattern_node_get_next(sub_chain->tail);
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if(next_node){
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*next_node = (string[*index] == '?') ? connection_node : fork_node;
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sub_chain->head = (string[*index] == '+') ? sub_chain->head : fork_node;
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sub_chain->tail = connection_node;
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} else {
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result = LIBLEX_INVALID;
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}
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}
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if(result == LIBLEX_SUCCESS){
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_pattern_chain_append_chain_discard(current_chain, &sub_chain);
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(*index)++;
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} else {
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free(connection_node);
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free(fork_node);
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}
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} else {
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result = LIBLEX_INVALID;
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}
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} else if(string[*index] == '|'){
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_pattern_chain_append_chain_discard(current_chain, &sub_chain);
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if(current_chain->head){
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result = (ll_append(&or_stack, current_chain) == LIBDS_SUCCESS) ? LIBLEX_SUCCESS : LIBLEX_MALLOC;
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} else {
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result = LIBLEX_INVALID;
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}
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if(result == LIBLEX_SUCCESS){
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result = _pattern_chain_create(¤t_chain, NULL, NULL);
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(*index)++;
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}
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} else {
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char new_char = '\0';
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pattern_node* new_node = NULL;
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_pattern_chain_append_chain_discard(current_chain, &sub_chain);
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result = _pattern_read_value(&new_char, string, index);
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if(result == LIBLEX_SUCCESS){
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result = _pattern_chain_create(&sub_chain, NULL, NULL);
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}
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if(result == LIBLEX_SUCCESS){
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result = _pattern_node_create_value(&new_node, (*ids)++, new_char, NULL);
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}
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if(result == LIBLEX_SUCCESS){
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sub_chain->head = sub_chain->tail = new_node;
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} else {
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free(new_node);
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}
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}
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}
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if(is_subchain && result == LIBLEX_SUCCESS && string[*index] != ')'){
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result = LIBLEX_INVALID;
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}
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if(result == LIBLEX_SUCCESS){
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_pattern_chain_append_chain_discard(current_chain, &sub_chain);
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}
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if(result == LIBLEX_SUCCESS && or_stack.head){
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pattern_node* connect_node = NULL;
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result = _pattern_node_create_connect(&connect_node, (*ids)++, NULL);
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if(result == LIBLEX_SUCCESS){
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_pattern_chain_append_node(current_chain, connect_node);
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}
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while(or_stack.head && result == LIBLEX_SUCCESS){
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pattern_node* fork = NULL;
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pattern_chain* new_chain = ll_pophead(&or_stack);
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if(new_chain && new_chain->head){
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result = _pattern_node_create_fork(&fork, (*ids)++, current_chain->head, new_chain->head);
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if(result == LIBLEX_SUCCESS){
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_pattern_chain_append_node(new_chain, connect_node);
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current_chain->head = fork;
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} else {
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_pattern_free(new_chain->head, *ids);
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}
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free(new_chain);
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}
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}
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}
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if(result != LIBLEX_SUCCESS){
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if(current_chain){
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_pattern_free(current_chain->head, *ids);
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}
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free(current_chain);
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if(sub_chain){
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_pattern_free(sub_chain->head, *ids);
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}
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free(sub_chain);
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while(or_stack.head){
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pattern_chain* new_chain = ll_pophead(&or_stack);
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if(new_chain){
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_pattern_free(new_chain->head, *ids);
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}
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}
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}
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if(result == LIBLEX_SUCCESS){
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*into = current_chain;
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if(is_subchain) {
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(*index)++;
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}
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}
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return result;
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}
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liblex_result pattern_compile(pattern* ptrn, char* expression, int id){
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liblex_result result;
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pattern_node* end_node = NULL;
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pattern_chain* full_chain = NULL;
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int index = -1;
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int ids = 0;
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result = _pattern_build_chain(&full_chain, &ids, expression, &index);
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if(result == LIBLEX_SUCCESS){
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result = _pattern_node_create_end(&end_node, ids, id);
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}
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if(result == LIBLEX_SUCCESS){
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_pattern_chain_append_node(full_chain, end_node);
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ptrn->head = full_chain->head;
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ptrn->size = ids + 1;
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free(full_chain);
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} else {
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if(full_chain){
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_pattern_free(full_chain->head, ids);
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}
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}
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return result;
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}
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liblex_result pattern_free(pattern* ptrn){
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return _pattern_free(ptrn->head, ptrn->size);
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}
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