+++ /dev/null
-/* regex.c
- * Copyright 2023 Anon Anonson, Ognjen 'xolatile' Milan Robovic, Emil Williams
- * SPDX Identifier: GPL-3.0-only / NO WARRANTY / NO GUARANTEE */
-
-#include "regex.h"
-
-#include <assert.h>
-#include <string.h>
-#include <limits.h>
-#include <stdlib.h>
-#include <stdbool.h>
-
-// ------------------
-// ### Char tests ###
-// ------------------
-static bool is_quantifier(const char c) {
- for (const char * s = "+*?="; *s != '\00'; s++) {
- if (*s == c) {
- return true;
- }
- }
- return false;
-}
-
-bool is_magic(const char c) {
- if (is_quantifier(c)) {
- return true;
- }
- for (const char * s = "\\[].^"; *s != '\00'; s++) {
- if (*s == c) {
- return true;
- }
- }
- return false;
-}
-
-// ----------------------
-// ### Internal Types ###
-// ----------------------
-typedef struct {
- int in;
- char input;
- int to;
- int width;
-} delta_t;
-
-typedef struct {
- int in;
- int to;
- int width;
-} offshoot_t;
-
-typedef struct {
- bool * do_catch;
- bool * is_negative;
-// these might be obsolite but im leaving them for now
- bool * do_loop_hook;
- bool * do_follow_hook;
- bool * do_loop_shoot;
- bool * do_follow_shoot;
-// ---
- int * state;
- int * width;
- char * whitelist;
- char * blacklist;
- regex_t * regex;
-} compiler_state;
-
-
-
-// ----------------------------------
-// ### Regex creation/destruction ###
-// ----------------------------------
-static int escape_1_to_1(const char c, compiler_state * cs) {
- char * target_list = (*cs->is_negative) ? cs->blacklist : cs->whitelist;
- switch (c) {
- case 't': {
- strcat(target_list, "\t");
- } return 1;
- case 'n': {
- strcat(target_list, "\n");
- } return 1;
- case 'r': {
- strcat(target_list, "\r");
- } return 1;
- case 'b': {
- strcat(target_list, "\b");
- } return 1;
- case '[': {
- strcat(target_list, "[");
- } return 1;
- case ']': {
- strcat(target_list, "]");
- } return 1;
- case '.': {
- strcat(target_list, ".");
- } return 1;
- case '^': {
- strcat(target_list, "^");
- } return 1;
- case '=': {
- strcat(target_list, "=");
- } return 1;
- case '?': {
- strcat(target_list, "?");
- } return 1;
- case '+': {
- strcat(target_list, "+");
- } return 1;
- case '*': {
- strcat(target_list, "*");
- } return 1;
- case '\\': {
- strcat(target_list, "\\");
- } return 1;
- }
-
- return 0;
-}
-
-static int escape_1_to_N(const char c, compiler_state * cs) {
- char * target_list = (*cs->is_negative) ? cs->blacklist : cs->whitelist;
- switch(c) {
- case 'i': {
- const char identifier_chars[] = "@0123456789_"
- "\300\301\302\303\304"
- "\305\306\307\310\311"
- "\312\313\314\315\316"
- "\317\320\321\322\323"
- "\324\325\326\327\330"
- "\331\332\333\334\335"
- "\336\337";
- strcpy(target_list, identifier_chars);
- return sizeof(identifier_chars)-1;
- };
- case 'I': {
- const char identifier_chars[] = "@_"
- "\300\301\302\303\304"
- "\305\306\307\310\311"
- "\312\313\314\315\316"
- "\317\320\321\322\323"
- "\324\325\326\327\330"
- "\331\332\333\334\335"
- "\336\337";
- strcpy(target_list, identifier_chars);
- return sizeof(identifier_chars)-1;
- };
- case 'k': {
- const char keyword_chars[] = "@0123456789_"
- "\300\301\302\303\304"
- "\305\306\307\310\311"
- "\312\313\314\315\316"
- "\317\320\321\322\323"
- "\324\325\326\327\330"
- "\331\332\333\334\335"
- "\336\337";
- strcpy(target_list, keyword_chars);
- return sizeof(keyword_chars)-1;
- };
- case 'K': {
- const char keyword_chars[] = "@_"
- "\300\301\302\303\304"
- "\305\306\307\310\311"
- "\312\313\314\315\316"
- "\317\320\321\322\323"
- "\324\325\326\327\330"
- "\331\332\333\334\335"
- "\336\337";
- strcpy(target_list, keyword_chars);
- return sizeof(keyword_chars)-1;
- };
- case 'f': {
- const char filename_chars[] = "@0123456789/.-_+,#$%~=";
- strcpy(target_list, filename_chars);
- return sizeof(filename_chars)-1;
- };
- case 'F': {
- const char filename_chars[] = "@/.-_+,#$%~=";
- strcpy(target_list, filename_chars);
- return sizeof(filename_chars)-1;
- };
- case 'p': {
- const char printable_chars[] = "@"
- "\241\242\243\244\245"
- "\246\247\250\251\252"
- "\253\254\255\256\257"
- "\260\261\262\263\264"
- "\265\266\267\270\271"
- "\272\273\274\275\276"
- "\277"
- "\300\301\302\303\304"
- "\305\306\307\310\311"
- "\312\313\314\315\316"
- "\317\320\321\322\323"
- "\324\325\326\327\330"
- "\331\332\333\334\335"
- "\336\337";
- strcpy(target_list, printable_chars);
- return sizeof(printable_chars)-1;
- };
- case 'P': {
- const char printable_chars[] = "@"
- "\241\242\243\244\245"
- "\246\247\250\251\252"
- "\253\254\255\256\257"
- "\260\261\262\263\264"
- "\265\266\267\270\271"
- "\272\273\274\275\276"
- "\277"
- "\300\301\302\303\304"
- "\305\306\307\310\311"
- "\312\313\314\315\316"
- "\317\320\321\322\323"
- "\324\325\326\327\330"
- "\331\332\333\334\335"
- "\336\337";
- strcpy(target_list, printable_chars);
- return sizeof(printable_chars)-1;
- };
- case 's': {
- const char whitespace_chars[] = " \t\v\n";
- strcpy(target_list, whitespace_chars);
- return sizeof(whitespace_chars)-1;
- };
- case 'd': {
- const char digit_chars[] = "0123456789";
- strcpy(target_list, digit_chars);
- return sizeof(digit_chars)-1;
- };
- case 'x': {
- const char hex_chars[] = "0123456789"
- "abcdef"
- "ABCDEF";
- strcpy(target_list, hex_chars);
- return sizeof(hex_chars)-1;
- };
- case 'o': {
- const char oct_chars[] = "01234567";
- strcpy(target_list, oct_chars);
- return sizeof(oct_chars)-1;
- };
- case 'w': {
- const char word_chars[] = "0123456789"
- "abcdefghijklmnopqrstuwxyz"
- "ABCDEFGHIJKLMNOPQRSTUWXYZ"
- "_";
- strcpy(target_list, word_chars);
- return sizeof(word_chars)-1;
- };
- case 'h': {
- const char very_word_chars[] = "abcdefghijklmnopqrstuwxyz"
- "ABCDEFGHIJKLMNOPQRSTUWXYZ"
- "_";
- strcpy(target_list, very_word_chars);
- return sizeof(very_word_chars)-1;
- };
- case 'a': {
- const char alpha_chars[] = "abcdefghijklmnopqrstuwxyz"
- "ABCDEFGHIJKLMNOPQRSTUWXYZ";
- strcpy(target_list, alpha_chars);
- return sizeof(alpha_chars)-1;
- };
- case 'l': {
- const char lower_alpha_chars[] = "abcdefghijklmnopqrstuwxyz";
- strcpy(target_list, lower_alpha_chars);
- return sizeof(lower_alpha_chars)-1;
- };
- case 'u': {
- const char upper_alpha_chars[] = "ABCDEFGHIJKLMNOPQRSTUWXYZ";
- strcpy(target_list, upper_alpha_chars);
- return sizeof(upper_alpha_chars)-1;
- };
- }
-
- return 0;
-}
-
-static int escape_to_negative(const char c,
- compiler_state * cs) {
- switch (c) {
- case 'D': {
- const char digit_chars[] = "0123456789";
- strcpy(cs->blacklist, digit_chars);
- *cs->is_negative = true;
- return sizeof(digit_chars)-1;
- };
- }
-
- return 0;
-}
-
-//static int compile_hologram(char * hologram, char * whitelist) {
-// if (hologram[0] == '\\') {
-// switch (hologram[1]) {
-// case '<': {
-// const char very_word_chars[] = "abcdefghijklmnopqrstuwxyz"
-// "ABCDEFGHIJKLMNOPQRSTUWXYZ"
-// "_";
-// strcat(whitelist, very_word_chars);
-// is_negative = true;
-// HOOK_ALL(0, whitelist, 0)
-// } break;
-// }
-// }
-//}
-
-static int compile_dot(compiler_state * cs) {
- *cs->do_catch = true;
- return true;
-}
-
-static int compile_escape(const char c,
- compiler_state * cs) {
-
- return escape_1_to_1(c, cs)
- || escape_1_to_N(c, cs)
- || escape_to_negative(c, cs)
- //|| compile_hologram(*s, whitelist)
- ;
-}
-
-static int compile_range(const char * const range,
- compiler_state * cs) {
- assert((range[0] == '[') && "Not a range.");
-
- char * target_list = (*cs->is_negative) ? cs->blacklist : cs->whitelist;
-
- const char * s;
- if (range[1] == '^') {
- *cs->is_negative = true;
- s = range + 2;
- } else {
- s = range + 1;
- }
- for (; *s != ']'; s++) {
- assert((*s != '\0') && "Unclosed range.");
- char c = *s;
- if (c == '\\') {
- s += 1;
- assert(compile_escape(*s, cs) && "Unknown escape.");
- } else if (*(s+1) == '-') {
- char end = *(s+2);
- assert((c < end) && "Endless range.");
- for (char cc = c; cc < end+1; cc++) {
- strncat(target_list, &cc, 1);
- strncat(target_list, "\0", 1);
- }
- s += 2;
- } else {
- strncat(target_list, &c, 1);
- }
- }
-
- return ((s - range) + 1);
-}
-
-void filter_blacklist(const char * whitelist,
- const char * blacklist,
- char * filtered) {
- for (; *blacklist != '\0'; blacklist++) {
- for(; *whitelist != '\0'; whitelist++) {
- if (*blacklist == *whitelist) {
- goto long_continue;
- }
- }
- strncat(filtered, blacklist, 1);
- long_continue:;
- }
-}
-
-#define HALT_AND_CATCH_FIRE INT_MIN
-
-void HOOK_ALL( int from,
- const char * const str,
- int to,
- compiler_state * cs) {
-
- int hook_to = (to == HALT_AND_CATCH_FIRE) ? HALT_AND_CATCH_FIRE : ((*cs->state) + to);
-
-
- for (const char * s = str; *s != '\0'; s++) {
- delta_t * delta = malloc(sizeof(delta_t));
- delta->in = *cs->state + from;
- delta->input = *s;
- delta->to = hook_to;
- delta->width = *cs->width;
- vector_push(&cs->regex->delta_table,
- &delta);
- }
-}
-
-void ABSOLUTE_OFFSHOOT(int from,
- int to,
- int width,
- compiler_state * cs) {
- offshoot_t * offshoot = malloc(sizeof(offshoot_t));
- offshoot->in = from;
- offshoot->to = to;
- offshoot->width = width;
- vector_push(&cs->regex->catch_table,
- &offshoot);
-}
-
-void OFFSHOOT(int from,
- int to,
- int width,
- compiler_state * cs) {
- ABSOLUTE_OFFSHOOT(*cs->state + from, *cs->state + to, width, cs);
-}
-
-regex_t * regex_compile(const char * const pattern) {
- regex_t * regex = (regex_t *)malloc(sizeof(regex_t));
- regex->str = strdup(pattern);
- vector_init(®ex->delta_table, sizeof(delta_t*), 0UL);
- vector_init(®ex->catch_table, sizeof(offshoot_t*), 0UL);
-
- int state = 2;
-
- bool do_catch;
- bool is_negative;
- bool do_loop_hook;
- bool do_follow_hook;
- bool do_loop_shoot;
- bool do_follow_shoot;
- int width;
- char whitelist[64];
- char blacklist[64];
-
- compiler_state cs = {
- .do_catch = &do_catch,
- .is_negative = &is_negative,
- .state = &state,
- .width = &width,
- .whitelist = whitelist,
- .blacklist = blacklist,
- .regex = regex,
- };
-
- for (const char * s = pattern; *s != '\00';) {
- // Reset the compiler
- assert(!is_quantifier(*pattern) && "Pattern starts with quantifier.");
- whitelist[0] = '\0';
- blacklist[0] = '\0';
- do_catch = false;
- is_negative = false;
- do_loop_hook = false;
- do_follow_hook = false;
- do_loop_shoot = false;
- do_follow_shoot = false;
- width = 1;
-
- // Translate char
- switch (*s) {
- case '^': {
- if (s == pattern) {
- ABSOLUTE_OFFSHOOT(0, 2, 0, &cs);
- ABSOLUTE_OFFSHOOT(1, HALT_AND_CATCH_FIRE, 0, &cs);
- }
- whitelist[0] = '\n';
- whitelist[1] = '\0';
- HOOK_ALL(0, whitelist, 0, &cs);
- if (s != pattern) {
- state += 1;
- }
- s += 1;
- goto long_continue;
- } break;
- case '.': {
- compile_dot(&cs);
- } break;
- case '\\': {
- s += 1;
- assert(compile_escape(*s, &cs) && "Unknown escape.");
- } break;
- case '[': {
- s += compile_range(s, &cs) - 1;
- } break;
- default: {
- whitelist[0] = *s;
- whitelist[1] = '\0';
- } break;
- }
-
- s += 1;
-
- // Compile with quantifier
- switch (*s) {
- case '=':
- case '?': {
- do_loop_hook = true;
- HOOK_ALL(0, whitelist, +1, &cs);
- if (do_catch || is_negative) {
- OFFSHOOT(0, +1, 1, &cs);
- }
- s += 1;
- } break;
- case '*': {
- HOOK_ALL(0, whitelist, 0, &cs);
- if (do_catch) {
- OFFSHOOT(0, +1, 1, &cs);
- } else if (is_negative) {
- OFFSHOOT(0, 0, 1, &cs);
- }
- s += 1;
- } break;
- case '+': {
- HOOK_ALL(0, whitelist, +1, &cs);
- if (do_catch || is_negative) {
- OFFSHOOT(0, +1, 1, &cs);
- }
- state += 1;
- HOOK_ALL(0, whitelist, 0, &cs);
- if (do_catch || is_negative) {
- OFFSHOOT(0, 0, 1, &cs);
- }
- s += 1;
- } break;
- default: { // Literal
- HOOK_ALL(0, whitelist, +1, &cs);
- if (do_catch || is_negative) {
- OFFSHOOT(0, +1, 1, &cs);
- }
- state += 1;
- } break;
- }
-
- // Compile blacklist
- if (*blacklist) {
- char filtered_blacklist[64];
- filtered_blacklist[0] = '\0';
- filter_blacklist(whitelist, blacklist, filtered_blacklist);
- HOOK_ALL(0, filtered_blacklist, HALT_AND_CATCH_FIRE, &cs);
- }
- long_continue:;
- }
-
- regex->accepting_state = state;
-
- return regex;
-}
-
-int regex_free(regex_t * const regex) {
- free(regex->str);
- vector_free(®ex->delta_table);
- vector_free(®ex->catch_table);
- free(regex);
- return 0;
-}
-
-
-
-// -----------------
-// ### Searching ###
-// -----------------
-static int catch_(const regex_t * const regex,
- int * const state) {
- for (size_t i = 0; i < regex->catch_table.element_count; i++){
- const offshoot_t * const offshoot = *(offshoot_t**)vector_get(®ex->catch_table, i);
- if (offshoot->in == *state) {
- *state = offshoot->to;
- return offshoot->width;
- }
- }
- return HALT_AND_CATCH_FIRE;
-}
-
-static int regex_assert(const regex_t * const regex,
- const char * const string,
- const int string_offset,
- int state,
- int width) { // XXX: im pretty sure this is actually redundant and the width should be calculated from string - s
- for (const char * s = (string + string_offset); *s != '\00';) {
- // delta
- for (size_t i = 0; i < regex->delta_table.element_count; i++) {
- const delta_t * const delta = *(delta_t**)vector_get(®ex->delta_table, i);
- if ((delta->in == state)
- && (delta->input == *s)) {
- int r = regex_assert(regex, string, (s - string) + delta->width, delta->to, width + 1);
- if(r){
- return r;
- }
- }
- }
-
- const int catch_width = catch_(regex, &state);
- if ((catch_width != HALT_AND_CATCH_FIRE)
- && (state != HALT_AND_CATCH_FIRE)) {
- s += catch_width;
- continue;
- }
-
- return (state == regex->accepting_state) ? width : false;
- }
-
- return false;
-}
-
-int regex_match( regex_t * regex,
- const char * const string,
- const bool is_start_of_string,
- const int string_offset) { // XXX: remove this useless piece of shit of a parameter nigger
- if (regex == NULL) {
- return false;
- }
- if (string == NULL) {
- return true;
- }
-
- const int initial_state = (int)(!is_start_of_string);
-
- return regex_assert(regex, string, string_offset, initial_state, 0);
-}
-
-bool regex_search( regex_t * regex,
- const char * const string) {
-
- return (bool)regex_match(regex, string, true, 0);
-}
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