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readability code clean-up (#546)
This commit is contained in:
parent
646da54915
commit
bd48a5c34d
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@ -52,21 +52,21 @@
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#define _N2N_REGEX_
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#ifdef __cplusplus
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extern "C"{
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extern "C" {
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#endif
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#include <stdio.h>
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/* Compile regex string pattern to a regex_t-array. */
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re_t re_compile(const char* pattern);
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re_t re_compile (const char* pattern);
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/* Find matches of the compiled pattern inside text. */
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int re_matchp(re_t pattern, const char* text, int* matchlenght);
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int re_matchp (re_t pattern, const char* text, int* matchlenght);
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/* Find matches of the txt pattern inside text (will compile automatically first). */
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int re_match(const char* pattern, const char* text, int* matchlenght);
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int re_match (const char* pattern, const char* text, int* matchlenght);
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#ifdef __cplusplus
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339
src/n2n_regex.c
339
src/n2n_regex.c
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@ -60,11 +60,9 @@
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enum { UNUSED, DOT, BEGIN, END, QUESTIONMARK, STAR, PLUS, CHAR_TYPE, CHAR_CLASS, INV_CHAR_CLASS, DIGIT, NOT_DIGIT, ALPHA, NOT_ALPHA, WHITESPACE, NOT_WHITESPACE, /* BRANCH */ };
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typedef struct regex_t
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{
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unsigned char type; /* CHAR_TYPE, STAR, etc. */
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union
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{
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typedef struct regex_t {
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unsigned char type; /* CHAR_TYPE, STAR, etc. */
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union {
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unsigned char ch; /* the character itself */
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unsigned char* ccl; /* OR a pointer to characters in class */
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};
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@ -73,24 +71,24 @@ typedef struct regex_t
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/* Private function declarations: */
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static int matchpattern(regex_t* pattern, const char* text, int* matchlength);
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static int matchcharclass(char c, const char* str);
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static int matchstar(regex_t p, regex_t* pattern, const char* text, int* matchlength);
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static int matchplus(regex_t p, regex_t* pattern, const char* text, int* matchlength);
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static int matchone(regex_t p, char c);
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static int matchdigit(char c);
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static int matchalpha(char c);
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static int matchwhitespace(char c);
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static int matchmetachar(char c, const char* str);
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static int matchrange(char c, const char* str);
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static int matchdot(char c);
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static int ismetachar(char c);
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static int matchpattern (regex_t* pattern, const char* text, int* matchlength);
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static int matchcharclass (char c, const char* str);
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static int matchstar (regex_t p, regex_t* pattern, const char* text, int* matchlength);
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static int matchplus (regex_t p, regex_t* pattern, const char* text, int* matchlength);
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static int matchone (regex_t p, char c);
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static int matchdigit (char c);
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static int matchalpha (char c);
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static int matchwhitespace (char c);
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static int matchmetachar (char c, const char* str);
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static int matchrange (char c, const char* str);
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static int matchdot (char c);
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static int ismetachar (char c);
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/* Public functions: */
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int re_match(const char* pattern, const char* text, int* matchlength)
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{
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int re_match (const char* pattern, const char* text, int* matchlength) {
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re_t re_p; /* pointer to (to be created) copy of compiled regex */
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int ret = -1;
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@ -101,39 +99,34 @@ int re_match(const char* pattern, const char* text, int* matchlength)
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return(ret);
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}
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int re_matchp(re_t pattern, const char* text, int* matchlength)
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{
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int re_matchp (re_t pattern, const char* text, int* matchlength) {
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*matchlength = 0;
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if (pattern != 0)
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{
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if (pattern[0].type == BEGIN)
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{
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if(pattern != 0) {
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if(pattern[0].type == BEGIN) {
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return ((matchpattern(&pattern[1], text, matchlength)) ? 0 : -1);
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}
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else
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{
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} else {
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int idx = -1;
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do
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{
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do {
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idx += 1;
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if (matchpattern(pattern, text, matchlength))
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{
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if (text[0] == '\0')
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if(matchpattern(pattern, text, matchlength)) {
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if(text[0] == '\0') {
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return -1;
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}
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return idx;
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}
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}
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while (*text++ != '\0');
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} while(*text++ != '\0');
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}
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}
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return -1;
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}
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re_t re_compile(const char* pattern)
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{
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re_t re_compile (const char* pattern) {
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/* The sizes of the two static arrays below substantiates the static RAM usage of this module.
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MAX_REGEXP_OBJECTS is the max number of symbols in the expression.
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MAX_CHAR_CLASS_LEN determines the size of buffer for chars in all char-classes in the expression. */
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@ -147,12 +140,10 @@ re_t re_compile(const char* pattern)
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int i = 0; /* index into pattern */
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int j = 0; /* index into re_compiled */
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while (pattern[i] != '\0' && (j+1 < MAX_REGEXP_OBJECTS))
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{
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while(pattern[i] != '\0' && (j+1 < MAX_REGEXP_OBJECTS)) {
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c = pattern[i];
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switch (c)
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{
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switch(c) {
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/* Meta-characters: */
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// case '^': { re_compiled[j].type = BEGIN; } break; <-- disabled (always full matches)
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// case '$': { re_compiled[j].type = END; } break; <-- disabled (always full matches)
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@ -163,15 +154,12 @@ re_t re_compile(const char* pattern)
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/* case '|': { re_compiled[j].type = BRANCH; } break; <-- not working properly */
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/* Escaped character-classes (\s \w ...): */
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case '\\':
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{
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if (pattern[i+1] != '\0')
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{
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case '\\': {
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if(pattern[i+1] != '\0') {
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/* Skip the escape-char '\\' */
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i += 1;
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/* ... and check the next */
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switch (pattern[i])
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{
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switch(pattern[i]) {
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/* Meta-character: */
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case 'd': { re_compiled[j].type = DIGIT; } break;
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case 'D': { re_compiled[j].type = NOT_DIGIT; } break;
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@ -181,8 +169,7 @@ re_t re_compile(const char* pattern)
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case 'S': { re_compiled[j].type = NOT_WHITESPACE; } break;
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/* Escaped character, e.g. '.' */
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default:
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{
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default: {
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re_compiled[j].type = CHAR_TYPE;
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re_compiled[j].ch = pattern[i];
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} break;
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} break;
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/* Character class: */
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case '[':
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{
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case '[': {
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/* Remember where the char-buffer starts. */
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int buf_begin = ccl_bufidx;
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/* Look-ahead to determine if negated */
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if (pattern[i+1] == '^')
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{
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if(pattern[i+1] == '^') {
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re_compiled[j].type = INV_CHAR_CLASS;
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i += 1; /* Increment i to avoid including '^' in the char-buffer */
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}
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else
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{
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} else {
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re_compiled[j].type = CHAR_CLASS;
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}
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/* Copy characters inside [..] to buffer */
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while ( (pattern[++i] != ']')
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while( (pattern[++i] != ']')
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&& (pattern[i] != '\0')) /* Missing ] */
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{
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if (pattern[i] == '\\')
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{
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if (ccl_bufidx >= MAX_CHAR_CLASS_LEN - 1)
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{
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if(pattern[i] == '\\') {
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if(ccl_bufidx >= MAX_CHAR_CLASS_LEN - 1) {
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//fputs("exceeded internal buffer!\n", stderr);
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return 0;
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}
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ccl_buf[ccl_bufidx++] = pattern[i++];
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}
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else if (ccl_bufidx >= MAX_CHAR_CLASS_LEN)
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{
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} else if(ccl_bufidx >= MAX_CHAR_CLASS_LEN) {
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//fputs("exceeded internal buffer!\n", stderr);
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return 0;
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}
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ccl_buf[ccl_bufidx++] = pattern[i];
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}
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if (ccl_bufidx >= MAX_CHAR_CLASS_LEN)
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{
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if(ccl_bufidx >= MAX_CHAR_CLASS_LEN) {
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/* Catches cases such as [00000000000000000000000000000000000000][ */
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//fputs("exceeded internal buffer!\n", stderr);
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return 0;
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} break;
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/* Other characters: */
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default:
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{
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default: {
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re_compiled[j].type = CHAR_TYPE;
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re_compiled[j].ch = c;
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} break;
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re_p = (re_t)calloc(1, sizeof(re_compiled));
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memcpy (re_p, re_compiled, sizeof(re_compiled));
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return (re_t) re_p;
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}
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void re_print(regex_t* pattern)
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{
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const char* types[] = { "UNUSED", "DOT", "BEGIN", "END", "QUESTIONMARK", "STAR", "PLUS", "CHAR_TYPE", "CHAR_CLASS", "INV_CHAR_CLASS", "DIGIT", "NOT_DIGIT", "ALPHA", "NOT_ALPHA", "WHITESPACE" , "NOT_WHITESPACE", /* "BRANCH" */ };
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void re_print (regex_t* pattern) {
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const char* types[] = { "UNUSED", "DOT", "BEGIN", "END", "QUESTIONMARK", "STAR", "PLUS", "CHAR_TYPE", "CHAR_CLASS", "INV_CHAR_CLASS", "DIGIT", "NOT_DIGIT", "ALPHA", "NOT_ALPHA", "WHITESPACE" , "NOT_WHITESPACE", /* "BRANCH" */ };
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int i;
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int j;
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char c;
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for (i = 0; i < MAX_REGEXP_OBJECTS; ++i)
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{
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if (pattern[i].type == UNUSED)
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{
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for(i = 0; i < MAX_REGEXP_OBJECTS; ++i) {
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if(pattern[i].type == UNUSED) {
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break;
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}
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printf("type: %s", types[pattern[i].type]);
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if (pattern[i].type == CHAR_CLASS || pattern[i].type == INV_CHAR_CLASS)
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{
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if((pattern[i].type == CHAR_CLASS) || (pattern[i].type == INV_CHAR_CLASS)) {
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printf(" [");
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for (j = 0; j < MAX_CHAR_CLASS_LEN; ++j)
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{
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for(j = 0; j < MAX_CHAR_CLASS_LEN; ++j) {
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c = pattern[i].ccl[j];
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if ((c == '\0') || (c == ']'))
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{
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if((c == '\0') || (c == ']')) {
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break;
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}
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printf("%c", c);
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}
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printf("]");
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}
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else if (pattern[i].type == CHAR_TYPE)
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{
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} else if(pattern[i].type == CHAR_TYPE) {
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printf(" '%c'", pattern[i].ch);
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}
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printf("\n");
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@ -304,41 +275,46 @@ void re_print(regex_t* pattern)
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/* Private functions: */
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static int matchdigit(char c)
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{
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static int matchdigit (char c) {
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return ((c >= '0') && (c <= '9'));
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}
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static int matchalpha(char c)
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{
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static int matchalpha (char c) {
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return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'));
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}
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static int matchwhitespace(char c)
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{
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static int matchwhitespace (char c) {
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return ((c == ' ') || (c == '\t') || (c == '\n') || (c == '\r') || (c == '\f') || (c == '\v'));
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}
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static int matchalphanum(char c)
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{
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static int matchalphanum (char c) {
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return ((c == '_') || matchalpha(c) || matchdigit(c));
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}
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static int matchrange(char c, const char* str)
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{
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static int matchrange (char c, const char* str) {
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return ((c != '-') && (str[0] != '\0') && (str[0] != '-') &&
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(str[1] == '-') && (str[1] != '\0') &&
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(str[2] != '\0') && ((c >= str[0]) && (c <= str[2])));
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(str[1] == '-') && (str[1] != '\0') &&
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(str[2] != '\0') && ((c >= str[0]) && (c <= str[2])));
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}
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static int matchdot(char c)
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{
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return c != '\n' && c != '\r';
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static int matchdot (char c) {
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return ((c != '\n') && (c != '\r'));
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}
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static int ismetachar(char c)
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{
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static int ismetachar (char c) {
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return ((c == 's') || (c == 'S') || (c == 'w') || (c == 'W') || (c == 'd') || (c == 'D'));
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}
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static int matchmetachar(char c, const char* str)
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{
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switch (str[0])
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{
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static int matchmetachar (char c, const char* str) {
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switch(str[0]) {
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case 'd': return matchdigit(c);
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case 'D': return !matchdigit(c);
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case 'w': return matchalphanum(c);
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@ -349,48 +325,34 @@ static int matchmetachar(char c, const char* str)
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}
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}
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static int matchcharclass(char c, const char* str)
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{
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do
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{
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if (matchrange(c, str))
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{
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static int matchcharclass (char c, const char* str) {
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do {
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if(matchrange(c, str)) {
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return 1;
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}
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else if (str[0] == '\\')
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{
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} else if(str[0] == '\\') {
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/* Escape-char: increment str-ptr and match on next char */
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str += 1;
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if (matchmetachar(c, str))
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{
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if(matchmetachar(c, str)) {
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return 1;
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} else if((c == str[0]) && !ismetachar(c)) {
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return 1;
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}
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else if ((c == str[0]) && !ismetachar(c))
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{
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return 1;
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}
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}
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else if (c == str[0])
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{
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if (c == '-')
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{
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} else if(c == str[0]) {
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if(c == '-') {
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return ((str[-1] == '\0') || (str[1] == '\0'));
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}
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else
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{
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} else {
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return 1;
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}
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}
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}
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while (*str++ != '\0');
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} while(*str++ != '\0');
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return 0;
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}
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static int matchone(regex_t p, char c)
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{
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switch (p.type)
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{
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static int matchone (regex_t p, char c) {
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switch(p.type) {
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case DOT: return matchdot(c);
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case CHAR_CLASS: return matchcharclass(c, (const char*)p.ccl);
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case INV_CHAR_CLASS: return !matchcharclass(c, (const char*)p.ccl);
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@ -404,58 +366,64 @@ static int matchone(regex_t p, char c)
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}
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}
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static int matchstar(regex_t p, regex_t* pattern, const char* text, int* matchlength)
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{
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static int matchstar (regex_t p, regex_t* pattern, const char* text, int* matchlength) {
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int prelen = *matchlength;
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const char* prepoint = text;
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while ((text[0] != '\0') && matchone(p, *text))
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{
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while((text[0] != '\0') && matchone(p, *text)) {
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text++;
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(*matchlength)++;
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}
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while (text >= prepoint)
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{
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if (matchpattern(pattern, text--, matchlength))
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while(text >= prepoint) {
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if(matchpattern(pattern, text--, matchlength)) {
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return 1;
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}
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(*matchlength)--;
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}
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*matchlength = prelen;
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return 0;
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}
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static int matchplus(regex_t p, regex_t* pattern, const char* text, int* matchlength)
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{
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static int matchplus (regex_t p, regex_t* pattern, const char* text, int* matchlength) {
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const char* prepoint = text;
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while ((text[0] != '\0') && matchone(p, *text))
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{
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while((text[0] != '\0') && matchone(p, *text)) {
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text++;
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(*matchlength)++;
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}
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while (text > prepoint)
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{
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if (matchpattern(pattern, text--, matchlength))
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while(text > prepoint) {
|
||||
if(matchpattern(pattern, text--, matchlength)) {
|
||||
return 1;
|
||||
}
|
||||
(*matchlength)--;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int matchquestion(regex_t p, regex_t* pattern, const char* text, int* matchlength)
|
||||
{
|
||||
if (p.type == UNUSED)
|
||||
static int matchquestion (regex_t p, regex_t* pattern, const char* text, int* matchlength) {
|
||||
|
||||
if(p.type == UNUSED) {
|
||||
return 1;
|
||||
if (matchpattern(pattern, text, matchlength))
|
||||
return 1;
|
||||
if (*text && matchone(p, *text++))
|
||||
{
|
||||
if (matchpattern(pattern, text, matchlength))
|
||||
{
|
||||
}
|
||||
|
||||
if(matchpattern(pattern, text, matchlength)) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
if(*text && matchone(p, *text++)) {
|
||||
if(matchpattern(pattern, text, matchlength)) {
|
||||
(*matchlength)++;
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -463,32 +431,22 @@ static int matchquestion(regex_t p, regex_t* pattern, const char* text, int* mat
|
|||
#if 0
|
||||
|
||||
/* Recursive matching */
|
||||
static int matchpattern(regex_t* pattern, const char* text, int *matchlength)
|
||||
{
|
||||
static int matchpattern (regex_t* pattern, const char* text, int *matchlength) {
|
||||
|
||||
int pre = *matchlength;
|
||||
if ((pattern[0].type == UNUSED) || (pattern[1].type == QUESTIONMARK))
|
||||
{
|
||||
|
||||
if((pattern[0].type == UNUSED) || (pattern[1].type == QUESTIONMARK)) {
|
||||
return matchquestion(pattern[1], &pattern[2], text, matchlength);
|
||||
}
|
||||
else if (pattern[1].type == STAR)
|
||||
{
|
||||
} else if(pattern[1].type == STAR) {
|
||||
return matchstar(pattern[0], &pattern[2], text, matchlength);
|
||||
}
|
||||
else if (pattern[1].type == PLUS)
|
||||
{
|
||||
} else if(pattern[1].type == PLUS) {
|
||||
return matchplus(pattern[0], &pattern[2], text, matchlength);
|
||||
}
|
||||
else if ((pattern[0].type == END) && pattern[1].type == UNUSED)
|
||||
{
|
||||
} else if((pattern[0].type == END) && pattern[1].type == UNUSED) {
|
||||
return text[0] == '\0';
|
||||
}
|
||||
else if ((text[0] != '\0') && matchone(pattern[0], text[0]))
|
||||
{
|
||||
} else if((text[0] != '\0') && matchone(pattern[0], text[0])) {
|
||||
(*matchlength)++;
|
||||
return matchpattern(&pattern[1], text+1);
|
||||
}
|
||||
else
|
||||
{
|
||||
} else {
|
||||
*matchlength = pre;
|
||||
return 0;
|
||||
}
|
||||
|
@ -497,25 +455,18 @@ static int matchpattern(regex_t* pattern, const char* text, int *matchlength)
|
|||
#else
|
||||
|
||||
/* Iterative matching */
|
||||
static int matchpattern(regex_t* pattern, const char* text, int* matchlength)
|
||||
{
|
||||
static int matchpattern (regex_t* pattern, const char* text, int* matchlength) {
|
||||
|
||||
int pre = *matchlength;
|
||||
do
|
||||
{
|
||||
if ((pattern[0].type == UNUSED) || (pattern[1].type == QUESTIONMARK))
|
||||
{
|
||||
|
||||
do {
|
||||
if((pattern[0].type == UNUSED) || (pattern[1].type == QUESTIONMARK)) {
|
||||
return matchquestion(pattern[0], &pattern[2], text, matchlength);
|
||||
}
|
||||
else if (pattern[1].type == STAR)
|
||||
{
|
||||
} else if(pattern[1].type == STAR) {
|
||||
return matchstar(pattern[0], &pattern[2], text, matchlength);
|
||||
}
|
||||
else if (pattern[1].type == PLUS)
|
||||
{
|
||||
} else if(pattern[1].type == PLUS) {
|
||||
return matchplus(pattern[0], &pattern[2], text, matchlength);
|
||||
}
|
||||
else if ((pattern[0].type == END) && pattern[1].type == UNUSED)
|
||||
{
|
||||
} else if((pattern[0].type == END) && pattern[1].type == UNUSED) {
|
||||
return (text[0] == '\0');
|
||||
}
|
||||
/* Branching is not working properly
|
||||
|
@ -525,10 +476,10 @@ static int matchpattern(regex_t* pattern, const char* text, int* matchlength)
|
|||
}
|
||||
*/
|
||||
(*matchlength)++;
|
||||
}
|
||||
while ((text[0] != '\0') && matchone(*pattern++, *text++));
|
||||
} while((text[0] != '\0') && matchone(*pattern++, *text++));
|
||||
|
||||
*matchlength = pre;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in New Issue
Block a user