This commit is contained in:
Ognjen Milan Robovic 2023-08-23 19:59:33 -04:00
commit d4c454586f
4 changed files with 305 additions and 836 deletions

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@ -1,211 +1,338 @@
#include "regex.h" #include <assert.h>
#include <string.h>
#include "vector.h"
bool is_case_on = true; typedef struct {
int in;
char input;
int to;
} delta_t;
static bool is_next_valid(const char * const s) { typedef struct {
return *(s + 1); int in;
} int to;
} offshoot_t;
static bool char_in_range(const char start, typedef struct {
const char end, char * str;
const char character) { vector_t delta_table; // <delta_t>
if (start > end){ vector_t catch_table; // <offshoot_t>
return false; int accepting_state;
} } regex_t;
for (char c = start; c != end; c++) { #define HALT_AND_CATCH_FIRE -1
if (character == c) {
#define HOOK_ALL(from, str, to) do { \
for (char * s = str; *s != '\00'; s++) { \
vector_push(regex->delta_table \
(delta_t *){state + from, *s, state + to} \
); \
} \
if (do_catch) { \
vector_push(regex->catch_table \
(offshoot_t *){state + from, state + to} \
); \
} \
} while (0)
#define EAT(n) do { \
s += n; \
} while (0)
bool is_quantifier(const char c){
for (const char * s = "+*?"; *s != '\00'; s++) {
if (*s == c) {
return true; return true;
} }
} }
return false; return false;
} }
static bool is_word_separator(const char character) {
return (( isascii(character))
&& (!isalnum(character))
&& ( character != '_'));
}
static bool magic(const char magic_char, const char to_enchant) { int escape_1_to_1(const char c, char * whitelist) {
switch(magic_char){ switch(c) {
// \i identifier character (see 'isident' option)
// \I like "\i", but excluding digits
// \k keyword character (see 'iskeyword' option)
// \K like "\k", but excluding digits
// \f file name character (see 'isfname' option)
// \F like "\f", but excluding digits
// \p printable character (see 'isprint' option)
// \P like "\p", but excluding digits
case 's': {
return ((to_enchant == ' ') || (to_enchant == '\t'));
}
case 'S': {
return !((to_enchant == ' ') || (to_enchant == '\t'));
}
case 'd': { // [0-9]
return char_in_range('0', '9', to_enchant);
};
case 'D': { // [^0-9]
return !char_in_range('0', '9', to_enchant);
};
case 'x': { // [0-9A-Fa-f]
return char_in_range('0', '9', to_enchant) || char_in_range('A', 'F', to_enchant) || char_in_range('a', 'f', to_enchant);
};
case 'X': { // [^0-9A-Fa-f]
return !char_in_range('0', '9', to_enchant) && !char_in_range('A', 'F', to_enchant) && !char_in_range('a', 'f', to_enchant);
};
case 'o': { // [0-7]
return char_in_range('0', '7', to_enchant);
};
case 'O': { // [^0-7]
return !char_in_range('0', '7', to_enchant);
};
case 'w': { // [0-9A-Za-z_]
return char_in_range('0', '9', to_enchant) || char_in_range('A', 'Z', to_enchant) || char_in_range('a', 'z', to_enchant) || (to_enchant == '_');
};
case 'W': { // [^0-9A-Za-z_]
return !(char_in_range('0', '9', to_enchant) || char_in_range('A', 'Z', to_enchant) || char_in_range('a', 'z', to_enchant) || (to_enchant == '_'));
};
case 'h': { // [A-Za-z_]
return char_in_range('A', 'Z', to_enchant) || char_in_range('a', 'z', to_enchant) || (to_enchant == '_');
};
case 'H': { // [^A-Za-z_]
return !(char_in_range('A', 'Z', to_enchant) || char_in_range('a', 'z', to_enchant) || (to_enchant == '_'));
};
case 'a': { // [A-Za-z]
return char_in_range('A', 'Z', to_enchant) || char_in_range('a', 'z', to_enchant);
};
case 'A': { // [A-Za-z]
return !(char_in_range('A', 'Z', to_enchant) || char_in_range('a', 'z', to_enchant));
};
case 'l': { // [a-z]
return char_in_range('a', 'z', to_enchant);
};
case 'L': { // [^a-z]
return !(char_in_range('a', 'z', to_enchant));
};
case 'u': { // [A-Z]
return char_in_range('A', 'Z', to_enchant);
};
case 'U': { // [^A-Z]
return !(char_in_range('A', 'Z', to_enchant));
};
}
return false;
}
int regex_match(const char * const pattern,
const char * const string_start,
const int string_offset,
int * match_offset_) {
const char * pattern_pointer = pattern;
const char * string_pointer = string_start + string_offset;
const char * const match_base = string_pointer;
int match_offset = 0;
while (1488) {
// End of one of the arguments
if (!(*pattern_pointer)) {
break;
}
if (!(*string_pointer)) {
return false;
}
// Escape character
if (*pattern_pointer == '\\') {
if (!is_next_valid(pattern_pointer)) {
return false;
}
switch(*(pattern_pointer + 1)){
case 't': { case 't': {
if (*(string_pointer + 1) == '\t') { strcat(whitelist, "\t");
pattern_pointer += 2; } return 1;
string_pointer += 1; case 'n': {
} else { strcat(whitelist, "\n");
return false; } return 1;
}
} break;
case 'r': { case 'r': {
if (*(string_pointer + 1) == '\r') { strcat(whitelist, "\r");
pattern_pointer += 2; } return 1;
string_pointer += 1;
} else {
return false;
}
} break;
case 'e': {
if (*(string_pointer + 1) == '\033') {
pattern_pointer += 2;
string_pointer += 1;
} else {
return false;
}
} break;
case 'b': { case 'b': {
if (*(string_pointer + 1) == '\010') { strcat(whitelist, "\b");
pattern_pointer += 2; } return 1;
string_pointer += 1; case '[': {
} else { strcat(whitelist, "[");
return false; } return 1;
case ']': {
strcat(whitelist, "]");
} return 1;
case '.': {
strcat(whitelist, ".");
} return 1;
case '?': {
strcat(whitelist, "?");
} return 1;
case '+': {
strcat(whitelist, "+");
} return 1;
case '*': {
strcat(whitelist, "*");
} return 1;
case '\\': {
strcat(whitelist, "\\");
} return 1;
} }
return 0;
}
int escape_1_to_N(const char c, char * 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(whitelist, 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(whitelist, 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(whitelist, 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(whitelist, keyword_chars);
return sizeof(keyword_chars)-1;
};
case 'f': {
const char filename_chars[] = "@0123456789/.-_+,#$%~=";
strcpy(whitelist, keyword_chars);
return sizeof(keyword_chars)-1;
};
case 'F': {
const char filename_chars[] = "@/.-_+,#$%~=";
strcpy(whitelist, keyword_chars);
return sizeof(keyword_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(whitelist, 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(whitelist, printable_chars);
return sizeof(printable_chars)-1;
};
case 's': {
const char whitespace_chars[] = " \t\v\n";
strcpy(whitelist, whitespace_chars);
return sizeof(whitespace_chars)-1;
};
case 'd': {
const char digit_chars[] = "0123456789";
strcpy(whitelist, digit_chars);
return sizeof(digit_chars)-1;
};
case 'x': {
const char hex_chars[] = "0123456789abcdefABCDEF";
strcpy(whitelist, hex_chars);
return sizeof(hex_chars)-1;
};
case 'o': {
const char oct_chars[] = "01234567";
strcpy(whitelist, oct_chars);
return sizeof(oct_chars)-1;
};
case 'w': {
const char word_chars[] = "0123456789abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ_";
strcpy(whitelist, word_chars);
return sizeof(word_chars)-1;
};
case 'h': {
const char very_word_chars[] = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ_";
strcpy(whitelist, very_word_chars);
return sizeof(very_word_chars)-1;
};
case 'a': {
const char alpha_chars[] = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ";
strcpy(whitelist, alpha_chars);
return sizeof(alpha_chars)-1;
};
case 'l': {
const char lower_alpha_chars[] = "abcdefghijklmnopqrstuwxyz";
strcpy(whitelist, lower_alpha_chars);
return sizeof(lower_alpha_chars)-1;
};
case 'u': {
const char upper_alpha_chars[] = "ABCDEFGHIJKLMNOPQRSTUWXYZ";
strcpy(whitelist, upper_alpha_chars);
return sizeof(upper_alpha_chars)-1;
};
}
return 0;
}
int compile_range(const char * const range,
char * whitelist) {
assert(range[0] == '[' && "Not a range.");
int r = 0;
const char * s;
for (s = range+1; *s != ']'; s++) {
assert(*s != '\00' && "Unclosed range.");
char c = *s;
if (escape_1_to_1(c, whitelist)
|| escape_1_to_N(c, whitelist)) {
;
} else if (*(s+1) == '-') {
char end = *(s+2);
assert(c < end && "Endless range.");
for (char cc = c; cc < end+1; cc++) {
strncat(whitelist, &cc, 1);
strncat(whitelist, "\00", 1);
}
s += 2;
} else {
++r;
strncat(whitelist, &c, 1);
strncat(whitelist, "\00", 1);
}
}
return ((s - range) + 1);
}
regex_t * regex_compile(const char * const pattern) {
regex_t * r = new regex_t;
regex->str = strdup(pattern);
vector_init(regex->delta_table, sizeof(delta_t), 32);
vector_init(regex->catch_table, sizeof(offshoot_t), 16);
int state = 0;
char whitelist[64];
bool do_catch;
for (const char * s = pattern; *s != '\00';) {
// Get token
assert(!is_quantifier(*pattern) && "Pattern starts with quantifier.");
whitelist[0] = '\00';
do_catch = false;
switch (*s) {
case '.': {
do_catch = true;
} break;
case '\\': {
EAT(1);
if(escape_1_to_1(*s, whitelist)
|| escape_1_to_N(*s, whitelist)){
;
} else {
assert(!"Unknown escape.");
}
} break;
case '[': {
EAT(compile_range(s, whitelist)-1);
} break;
default: {
whitelist[0] = *s;
whitelist[1] = '\00';
} break; } break;
} }
if (*(pattern_pointer + 1) == '\\') { EAT(1);
if (*string_pointer == '\\') {
pattern_pointer += 2; // Quantifier
string_pointer += 1; switch (*s) {
continue; case '?': {
HOOK_ALL(0, whitelist, +1);
EAT(1);
} break;
case '*': {
HOOK_ALL(0, whitelist, 0);
EAT(1);
} break;
case '+': {
HOOK_ALL(0, whitelist, +1);
state += 1;
HOOK_ALL(0, whitelist, 0);
EAT(1);
} break;
default: { // Literal
HOOK_ALL(0, whitelist, +1);
state += 1;
} break;
} }
} }
if (*(pattern_pointer + 1) == '<') { regex->accepting_state = state;
if (is_word_separator(*string_pointer)) {
pattern_pointer += 2; return r;
string_pointer += 1; }
match_offset += 1;
continue; int regex_free(regex_t * const regex) {
} else if (string_pointer == string_start) { free(regex->str);
pattern_pointer += 2; vector_free(regex->delta_table);
continue; vector_free(regex->catch_table);
return 0;
}
inline bool catch_(const regex_t * const regex,
int & state) {
for (int i = 0; i < regex->catch_table->element_size; i++){
const offshoot_t * const offshoot = (offshoot *)(vector_get(reg.catch_table, i));
if (offshoot->in == state) {
state = offshoot->to;
return true;
}
}
return false;
}
bool regex_assert(const regex_t * const regex,
const char * const string,
int state) {
for (const char * s = string; *s != '\00'; s++) {
// delta
for (int i = 0; i < regex->delta_table.element_count; i++) {
const delta_t * const delta = (delta_t *)(vector_get(reg.delta_table, i);
if (delta->in == state)
&& (delta->input == *s)) {
if(regex_assert(regex, s+1, delta->to)){
return true;
}
} }
} }
if (*(pattern_pointer + 1) == '>') { if (catch_(regex, state)) {
if (is_word_separator(*string_pointer)) {
pattern_pointer += 2;
continue;
}
if (*(string_pointer + 1) == '\00') {
break;
}
}
if (magic(*(pattern_pointer + 1), *string_pointer)) {
pattern_pointer += 2;
string_pointer += 1;
continue; continue;
} }
return false; return false;
} }
// Literal return (state == regex->accepting_state);
if (*pattern_pointer != *string_pointer) {
return false;
} else {
++pattern_pointer;
++string_pointer;
}
} }
if (match_offset_) { bool regex_search( regex_t * regex,
*match_offset_ = match_offset; const char * const string) {
if (regex == NULL) {
return false;
} }
return (string_pointer - match_base) - match_offset; if (string == NULL) {
return true;
}
return regex_assert(regex, string, 0);
} }

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@ -3,4 +3,6 @@
extern bool is_case_on; extern bool is_case_on;
extern regex_t * regex_compile(const char * const pattern);
extern int regex_match(const char * const pattern, const char * const string, const int string_offset, int * match_offset_); extern int regex_match(const char * const pattern, const char * const string, const int string_offset, int * match_offset_);
extern int regex_free(regex_t * const regex);

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@ -1,329 +0,0 @@
#include <assert.h>
#include <string.h>
typedef struct {
int in;
char input;
int to;
} delta_t;
typedef struct {
int in;
int to;
} offshoot_t;
typedef struct {
char * str;
std::vector<delta_t> delta_table;
std::vector<offshoot_t> catch_table;
int accepting_state;
} regex_t;
#define HALT_AND_CATCH_FIRE -1
#define HOOK_ALL(from, str, to) do { \
for (char * s = str; *s != '\00'; s++) { \
reg.delta_table.push_back( \
delta_t{state + from, *s, state + to} \
); \
} \
if (do_catch) { \
reg.catch_table.push_back( \
{state + from, state + to} \
); \
} \
} while (0)
#define EAT(n) do { \
s += n; \
} while (0)
bool is_quantifier(const char c){
for (const char * s = "+*?"; *s != '\00'; s++) {
if (*s == c) {
return true;
}
}
return false;
}
int escape_1_to_1(const char c, char * whitelist) {
switch(c) {
case 't': {
strcat(whitelist, "\t");
} return 1;
case 'n': {
strcat(whitelist, "\n");
} return 1;
case 'r': {
strcat(whitelist, "\r");
} return 1;
case 'b': {
strcat(whitelist, "\b");
} return 1;
case '[': {
strcat(whitelist, "[");
} return 1;
case ']': {
strcat(whitelist, "]");
} return 1;
case '.': {
strcat(whitelist, ".");
} return 1;
case '?': {
strcat(whitelist, "?");
} return 1;
case '+': {
strcat(whitelist, "+");
} return 1;
case '*': {
strcat(whitelist, "*");
} return 1;
case '\\': {
strcat(whitelist, "\\");
} return 1;
}
return 0;
}
int escape_1_to_N(const char c, char * 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(whitelist, 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(whitelist, 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(whitelist, 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(whitelist, keyword_chars);
return sizeof(keyword_chars)-1;
};
case 'f': {
const char filename_chars[] = "@0123456789/.-_+,#$%~=";
strcpy(whitelist, keyword_chars);
return sizeof(keyword_chars)-1;
};
case 'F': {
const char filename_chars[] = "@/.-_+,#$%~=";
strcpy(whitelist, keyword_chars);
return sizeof(keyword_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(whitelist, 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(whitelist, printable_chars);
return sizeof(printable_chars)-1;
};
case 's': {
const char whitespace_chars[] = " \t\v\n";
strcpy(whitelist, whitespace_chars);
return sizeof(whitespace_chars)-1;
};
case 'd': {
const char digit_chars[] = "0123456789";
strcpy(whitelist, digit_chars);
return sizeof(digit_chars)-1;
};
case 'x': {
const char hex_chars[] = "0123456789abcdefABCDEF";
strcpy(whitelist, hex_chars);
return sizeof(hex_chars)-1;
};
case 'o': {
const char oct_chars[] = "01234567";
strcpy(whitelist, oct_chars);
return sizeof(oct_chars)-1;
};
case 'w': {
const char word_chars[] = "0123456789abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ_";
strcpy(whitelist, word_chars);
return sizeof(word_chars)-1;
};
case 'h': {
const char very_word_chars[] = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ_";
strcpy(whitelist, very_word_chars);
return sizeof(very_word_chars)-1;
};
case 'a': {
const char alpha_chars[] = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ";
strcpy(whitelist, alpha_chars);
return sizeof(alpha_chars)-1;
};
case 'l': {
const char lower_alpha_chars[] = "abcdefghijklmnopqrstuwxyz";
strcpy(whitelist, lower_alpha_chars);
return sizeof(lower_alpha_chars)-1;
};
case 'u': {
const char upper_alpha_chars[] = "ABCDEFGHIJKLMNOPQRSTUWXYZ";
strcpy(whitelist, upper_alpha_chars);
return sizeof(upper_alpha_chars)-1;
};
}
return 0;
}
int compile_range(const char * const range,
char * whitelist) {
assert(range[0] == '[' && "Not a range.");
int r = 0;
const char * s;
for (s = range+1; *s != ']'; s++) {
assert(*s != '\00' && "Unclosed range.");
char c = *s;
if (escape_1_to_1(c, whitelist)
|| escape_1_to_N(c, whitelist)) {
;
} else if (*(s+1) == '-') {
char end = *(s+2);
assert(c < end && "Endless range.");
for (char cc = c; cc < end+1; cc++) {
strncat(whitelist, &cc, 1);
strncat(whitelist, "\00", 1);
}
s += 2;
} else {
++r;
strncat(whitelist, &c, 1);
strncat(whitelist, "\00", 1);
}
}
return ((s - range) + 1);
}
regex_t * regex_compile(const char * const pattern) {
regex_t * r = new regex_t;
regex_t &reg = *r;
reg.str = strdup(pattern);
int state = 0;
char whitelist[64];
bool do_catch;
for (const char * s = pattern; *s != '\00';) {
// Get token
assert(!is_quantifier(*pattern) && "Pattern starts with quantifier.");
whitelist[0] = '\00';
do_catch = false;
switch (*s) {
case '.': {
do_catch = true;
} break;
case '\\': {
EAT(1);
if(escape_1_to_1(*s, whitelist)
|| escape_1_to_N(*s, whitelist)){
;
} else {
assert(!"Unknown escape.");
}
} break;
case '[': {
EAT(compile_range(s, whitelist)-1);
} break;
default: {
whitelist[0] = *s;
whitelist[1] = '\00';
} break;
}
EAT(1);
// Quantifier
switch (*s) {
case '?': {
HOOK_ALL(0, whitelist, +1);
EAT(1);
} break;
case '*': {
HOOK_ALL(0, whitelist, 0);
EAT(1);
} break;
case '+': {
HOOK_ALL(0, whitelist, +1);
state += 1;
HOOK_ALL(0, whitelist, 0);
EAT(1);
} break;
default: { // Literal
HOOK_ALL(0, whitelist, +1);
state += 1;
} break;
}
}
reg.accepting_state = state;
return r;
}
inline bool catch_(const regex_t * regex,
int & state) {
const regex_t &reg = *regex;
for (int i = 0; i < reg.catch_table.size(); i++){
if (reg.catch_table[i].in == state) {
state = reg.catch_table[i].to;
return true;
}
}
return false;
}
bool regex_assert(const regex_t * const regex,
const char * const string,
int state) {
const regex_t &reg = *regex;
for (const char * s = string; *s != '\00'; s++) {
// delta
for (int i = 0; i < reg.delta_table.size(); i++) {
if ((reg.delta_table[i].in == state)
&& (reg.delta_table[i].input == *s)) {
if(regex_assert(regex, s+1, reg.delta_table[i].to)){
return true;
}
}
}
if (catch_(regex, state)) {
continue;
}
return false;
}
return (state == regex->accepting_state);
}
bool regex_search( regex_t * regex,
const char * const string) {
if (regex == NULL) {
return false;
}
if (string == NULL) {
return true;
}
return regex_assert(regex, string, 0);
}

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@ -1,331 +0,0 @@
#include <assert.h>
#include <string.h>
#include "vector.h"
typedef struct {
int in;
char input;
int to;
} delta_t;
typedef struct {
int in;
int to;
} offshoot_t;
typedef struct {
char * str;
vector_t delta_table; // <delta_t>
vector_t catch_table; // <offshoot_t>
int accepting_state;
} regex_t;
#define HALT_AND_CATCH_FIRE -1
#define HOOK_ALL(from, str, to) do { \
for (char * s = str; *s != '\00'; s++) { \
vector_push(&reg.delta_table \
(delta_t *){state + from, *s, state + to} \
); \
} \
if (do_catch) { \
vector_push(&reg.catch_table \
(offshoot_t *){state + from, state + to} \
); \
} \
} while (0)
#define EAT(n) do { \
s += n; \
} while (0)
bool is_quantifier(const char c){
for (const char * s = "+*?"; *s != '\00'; s++) {
if (*s == c) {
return true;
}
}
return false;
}
int escape_1_to_1(const char c, char * whitelist) {
switch(c) {
case 't': {
strcat(whitelist, "\t");
} return 1;
case 'n': {
strcat(whitelist, "\n");
} return 1;
case 'r': {
strcat(whitelist, "\r");
} return 1;
case 'b': {
strcat(whitelist, "\b");
} return 1;
case '[': {
strcat(whitelist, "[");
} return 1;
case ']': {
strcat(whitelist, "]");
} return 1;
case '.': {
strcat(whitelist, ".");
} return 1;
case '?': {
strcat(whitelist, "?");
} return 1;
case '+': {
strcat(whitelist, "+");
} return 1;
case '*': {
strcat(whitelist, "*");
} return 1;
case '\\': {
strcat(whitelist, "\\");
} return 1;
}
return 0;
}
int escape_1_to_N(const char c, char * 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(whitelist, 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(whitelist, 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(whitelist, 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(whitelist, keyword_chars);
return sizeof(keyword_chars)-1;
};
case 'f': {
const char filename_chars[] = "@0123456789/.-_+,#$%~=";
strcpy(whitelist, keyword_chars);
return sizeof(keyword_chars)-1;
};
case 'F': {
const char filename_chars[] = "@/.-_+,#$%~=";
strcpy(whitelist, keyword_chars);
return sizeof(keyword_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(whitelist, 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(whitelist, printable_chars);
return sizeof(printable_chars)-1;
};
case 's': {
const char whitespace_chars[] = " \t\v\n";
strcpy(whitelist, whitespace_chars);
return sizeof(whitespace_chars)-1;
};
case 'd': {
const char digit_chars[] = "0123456789";
strcpy(whitelist, digit_chars);
return sizeof(digit_chars)-1;
};
case 'x': {
const char hex_chars[] = "0123456789abcdefABCDEF";
strcpy(whitelist, hex_chars);
return sizeof(hex_chars)-1;
};
case 'o': {
const char oct_chars[] = "01234567";
strcpy(whitelist, oct_chars);
return sizeof(oct_chars)-1;
};
case 'w': {
const char word_chars[] = "0123456789abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ_";
strcpy(whitelist, word_chars);
return sizeof(word_chars)-1;
};
case 'h': {
const char very_word_chars[] = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ_";
strcpy(whitelist, very_word_chars);
return sizeof(very_word_chars)-1;
};
case 'a': {
const char alpha_chars[] = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ";
strcpy(whitelist, alpha_chars);
return sizeof(alpha_chars)-1;
};
case 'l': {
const char lower_alpha_chars[] = "abcdefghijklmnopqrstuwxyz";
strcpy(whitelist, lower_alpha_chars);
return sizeof(lower_alpha_chars)-1;
};
case 'u': {
const char upper_alpha_chars[] = "ABCDEFGHIJKLMNOPQRSTUWXYZ";
strcpy(whitelist, upper_alpha_chars);
return sizeof(upper_alpha_chars)-1;
};
}
return 0;
}
int compile_range(const char * const range,
char * whitelist) {
assert(range[0] == '[' && "Not a range.");
int r = 0;
const char * s;
for (s = range+1; *s != ']'; s++) {
assert(*s != '\00' && "Unclosed range.");
char c = *s;
if (escape_1_to_1(c, whitelist)
|| escape_1_to_N(c, whitelist)) {
;
} else if (*(s+1) == '-') {
char end = *(s+2);
assert(c < end && "Endless range.");
for (char cc = c; cc < end+1; cc++) {
strncat(whitelist, &cc, 1);
strncat(whitelist, "\00", 1);
}
s += 2;
} else {
++r;
strncat(whitelist, &c, 1);
strncat(whitelist, "\00", 1);
}
}
return ((s - range) + 1);
}
regex_t * regex_compile(const char * const pattern) {
regex_t * r = new regex_t;
regex_t &reg = *r;
reg.str = strdup(pattern);
int state = 0;
char whitelist[64];
bool do_catch;
for (const char * s = pattern; *s != '\00';) {
// Get token
assert(!is_quantifier(*pattern) && "Pattern starts with quantifier.");
whitelist[0] = '\00';
do_catch = false;
switch (*s) {
case '.': {
do_catch = true;
} break;
case '\\': {
EAT(1);
if(escape_1_to_1(*s, whitelist)
|| escape_1_to_N(*s, whitelist)){
;
} else {
assert(!"Unknown escape.");
}
} break;
case '[': {
EAT(compile_range(s, whitelist)-1);
} break;
default: {
whitelist[0] = *s;
whitelist[1] = '\00';
} break;
}
EAT(1);
// Quantifier
switch (*s) {
case '?': {
HOOK_ALL(0, whitelist, +1);
EAT(1);
} break;
case '*': {
HOOK_ALL(0, whitelist, 0);
EAT(1);
} break;
case '+': {
HOOK_ALL(0, whitelist, +1);
state += 1;
HOOK_ALL(0, whitelist, 0);
EAT(1);
} break;
default: { // Literal
HOOK_ALL(0, whitelist, +1);
state += 1;
} break;
}
}
reg.accepting_state = state;
return r;
}
inline bool catch_(const regex_t * regex,
int & state) {
const regex_t &reg = *regex;
for (int i = 0; i < reg.catch_table.size(); i++){
if (reg.catch_table[i].in == state) {
state = reg.catch_table[i].to;
return true;
}
}
return false;
}
bool regex_assert(const regex_t * const regex,
const char * const string,
int state) {
const regex_t &reg = *regex;
for (const char * s = string; *s != '\00'; s++) {
// delta
for (int i = 0; i < reg.delta_table.size(); i++) {
const delta_t * const delta = (delta_t *)(vector_get(reg.delta_table, i);
if (delta->in == state)
&& (delta->input == *s)) {
if(regex_assert(regex, s+1, delta->to)){
return true;
}
}
}
if (catch_(regex, state)) {
continue;
}
return false;
}
return (state == regex->accepting_state);
}
bool regex_search( regex_t * regex,
const char * const string) {
if (regex == NULL) {
return false;
}
if (string == NULL) {
return true;
}
return regex_assert(regex, string, 0);
}