644 lines
17 KiB
C
644 lines
17 KiB
C
/* see copyright notice in trex.h */
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <ctype.h>
|
|
#include <setjmp.h>
|
|
#include "trex.h"
|
|
|
|
#ifdef _UINCODE
|
|
#define scisprint iswprint
|
|
#define scstrlen wcslen
|
|
#define scprintf wprintf
|
|
#define _SC(x) L##c
|
|
#else
|
|
#define scisprint isprint
|
|
#define scstrlen strlen
|
|
#define scprintf printf
|
|
#define _SC(x) (x)
|
|
#endif
|
|
|
|
#ifdef _DEBUG
|
|
#include <stdio.h>
|
|
|
|
static const TRexChar *g_nnames[] =
|
|
{
|
|
_SC("NONE"),_SC("OP_GREEDY"), _SC("OP_OR"),
|
|
_SC("OP_EXPR"),_SC("OP_NOCAPEXPR"),_SC("OP_DOT"), _SC("OP_CLASS"),
|
|
_SC("OP_CCLASS"),_SC("OP_NCLASS"),_SC("OP_RANGE"),_SC("OP_CHAR"),
|
|
_SC("OP_EOL"),_SC("OP_BOL"),_SC("OP_WB")
|
|
};
|
|
|
|
#endif
|
|
#define OP_GREEDY (MAX_CHAR+1) // * + ? {n}
|
|
#define OP_OR (MAX_CHAR+2)
|
|
#define OP_EXPR (MAX_CHAR+3) //parentesis ()
|
|
#define OP_NOCAPEXPR (MAX_CHAR+4) //parentesis (?:)
|
|
#define OP_DOT (MAX_CHAR+5)
|
|
#define OP_CLASS (MAX_CHAR+6)
|
|
#define OP_CCLASS (MAX_CHAR+7)
|
|
#define OP_NCLASS (MAX_CHAR+8) //negates class the [^
|
|
#define OP_RANGE (MAX_CHAR+9)
|
|
#define OP_CHAR (MAX_CHAR+10)
|
|
#define OP_EOL (MAX_CHAR+11)
|
|
#define OP_BOL (MAX_CHAR+12)
|
|
#define OP_WB (MAX_CHAR+13)
|
|
|
|
#define TREX_SYMBOL_ANY_CHAR ('.')
|
|
#define TREX_SYMBOL_GREEDY_ONE_OR_MORE ('+')
|
|
#define TREX_SYMBOL_GREEDY_ZERO_OR_MORE ('*')
|
|
#define TREX_SYMBOL_GREEDY_ZERO_OR_ONE ('?')
|
|
#define TREX_SYMBOL_BRANCH ('|')
|
|
#define TREX_SYMBOL_END_OF_STRING ('$')
|
|
#define TREX_SYMBOL_BEGINNING_OF_STRING ('^')
|
|
#define TREX_SYMBOL_ESCAPE_CHAR ('\\')
|
|
|
|
|
|
typedef int TRexNodeType;
|
|
|
|
typedef struct tagTRexNode{
|
|
TRexNodeType type;
|
|
int left;
|
|
int right;
|
|
int next;
|
|
}TRexNode;
|
|
|
|
struct TRex{
|
|
const TRexChar *_eol;
|
|
const TRexChar *_bol;
|
|
const TRexChar *_p;
|
|
int _first;
|
|
int _op;
|
|
TRexNode *_nodes;
|
|
int _nallocated;
|
|
int _nsize;
|
|
int _nsubexpr;
|
|
TRexMatch *_matches;
|
|
int _currsubexp;
|
|
void *_jmpbuf;
|
|
const TRexChar **_error;
|
|
};
|
|
|
|
static int trex_list(TRex *exp);
|
|
|
|
static int trex_newnode(TRex *exp, TRexNodeType type)
|
|
{
|
|
TRexNode n;
|
|
int newid;
|
|
n.type = type;
|
|
n.next = n.right = n.left = -1;
|
|
if(type == OP_EXPR)
|
|
n.right = exp->_nsubexpr++;
|
|
if(exp->_nallocated < (exp->_nsize + 1)) {
|
|
//int oldsize = exp->_nallocated;
|
|
exp->_nallocated *= 2;
|
|
exp->_nodes = (TRexNode *)realloc(exp->_nodes, exp->_nallocated * sizeof(TRexNode));
|
|
}
|
|
exp->_nodes[exp->_nsize++] = n;
|
|
newid = exp->_nsize - 1;
|
|
return (int)newid;
|
|
}
|
|
|
|
static void trex_error(TRex *exp,const TRexChar *error)
|
|
{
|
|
if(exp->_error) *exp->_error = error;
|
|
longjmp(*((jmp_buf*)exp->_jmpbuf),-1);
|
|
}
|
|
|
|
static void trex_expect(TRex *exp, int n){
|
|
if((*exp->_p) != n)
|
|
trex_error(exp, _SC("expected paren"));
|
|
exp->_p++;
|
|
}
|
|
|
|
static TRexChar trex_escapechar(TRex *exp)
|
|
{
|
|
if(*exp->_p == TREX_SYMBOL_ESCAPE_CHAR){
|
|
exp->_p++;
|
|
switch(*exp->_p) {
|
|
case 'v': exp->_p++; return '\v';
|
|
case 'n': exp->_p++; return '\n';
|
|
case 't': exp->_p++; return '\t';
|
|
case 'r': exp->_p++; return '\r';
|
|
case 'f': exp->_p++; return '\f';
|
|
default: return (*exp->_p++);
|
|
}
|
|
} else if(!scisprint(*exp->_p)) trex_error(exp,_SC("letter expected"));
|
|
return (*exp->_p++);
|
|
}
|
|
|
|
static int trex_charclass(TRex *exp,int classid)
|
|
{
|
|
int n = trex_newnode(exp,OP_CCLASS);
|
|
exp->_nodes[n].left = classid;
|
|
return n;
|
|
}
|
|
|
|
static int trex_charnode(TRex *exp,TRexBool isclass)
|
|
{
|
|
TRexChar t;
|
|
if(*exp->_p == TREX_SYMBOL_ESCAPE_CHAR) {
|
|
exp->_p++;
|
|
switch(*exp->_p) {
|
|
case 'n': exp->_p++; return trex_newnode(exp,'\n');
|
|
case 't': exp->_p++; return trex_newnode(exp,'\t');
|
|
case 'r': exp->_p++; return trex_newnode(exp,'\r');
|
|
case 'f': exp->_p++; return trex_newnode(exp,'\f');
|
|
case 'v': exp->_p++; return trex_newnode(exp,'\v');
|
|
case 'a': case 'A': case 'w': case 'W': case 's': case 'S':
|
|
case 'd': case 'D': case 'x': case 'X': case 'c': case 'C':
|
|
case 'p': case 'P': case 'l': case 'u':
|
|
{
|
|
t = *exp->_p; exp->_p++;
|
|
return trex_charclass(exp,t);
|
|
}
|
|
case 'b':
|
|
case 'B':
|
|
if(!isclass) {
|
|
int node = trex_newnode(exp,OP_WB);
|
|
exp->_nodes[node].left = *exp->_p;
|
|
exp->_p++;
|
|
return node;
|
|
} //else default
|
|
default:
|
|
t = *exp->_p; exp->_p++;
|
|
return trex_newnode(exp,t);
|
|
}
|
|
}
|
|
else if(!scisprint(*exp->_p)) {
|
|
|
|
trex_error(exp,_SC("letter expected"));
|
|
}
|
|
t = *exp->_p; exp->_p++;
|
|
return trex_newnode(exp,t);
|
|
}
|
|
static int trex_class(TRex *exp)
|
|
{
|
|
int ret = -1;
|
|
int first = -1,chain;
|
|
if(*exp->_p == TREX_SYMBOL_BEGINNING_OF_STRING){
|
|
ret = trex_newnode(exp,OP_NCLASS);
|
|
exp->_p++;
|
|
}else ret = trex_newnode(exp,OP_CLASS);
|
|
|
|
if(*exp->_p == ']') trex_error(exp,_SC("empty class"));
|
|
chain = ret;
|
|
while(*exp->_p != ']' && exp->_p != exp->_eol) {
|
|
if(*exp->_p == '-' && first != -1){
|
|
int r,t;
|
|
if(*exp->_p++ == ']') trex_error(exp,_SC("unfinished range"));
|
|
r = trex_newnode(exp,OP_RANGE);
|
|
if(first>*exp->_p) trex_error(exp,_SC("invalid range"));
|
|
if(exp->_nodes[first].type == OP_CCLASS) trex_error(exp,_SC("cannot use character classes in ranges"));
|
|
exp->_nodes[r].left = exp->_nodes[first].type;
|
|
t = trex_escapechar(exp);
|
|
exp->_nodes[r].right = t;
|
|
exp->_nodes[chain].next = r;
|
|
chain = r;
|
|
first = -1;
|
|
}
|
|
else{
|
|
if(first!=-1){
|
|
int c = first;
|
|
exp->_nodes[chain].next = c;
|
|
chain = c;
|
|
first = trex_charnode(exp,TRex_True);
|
|
}
|
|
else{
|
|
first = trex_charnode(exp,TRex_True);
|
|
}
|
|
}
|
|
}
|
|
if(first!=-1){
|
|
int c = first;
|
|
exp->_nodes[chain].next = c;
|
|
chain = c;
|
|
first = -1;
|
|
}
|
|
/* hack? */
|
|
exp->_nodes[ret].left = exp->_nodes[ret].next;
|
|
exp->_nodes[ret].next = -1;
|
|
return ret;
|
|
}
|
|
|
|
static int trex_parsenumber(TRex *exp)
|
|
{
|
|
int ret = *exp->_p-'0';
|
|
int positions = 10;
|
|
exp->_p++;
|
|
while(isdigit(*exp->_p)) {
|
|
ret = ret*10+(*exp->_p++-'0');
|
|
if(positions==1000000000) trex_error(exp,_SC("overflow in numeric constant"));
|
|
positions *= 10;
|
|
};
|
|
return ret;
|
|
}
|
|
|
|
static int trex_element(TRex *exp)
|
|
{
|
|
int ret = -1;
|
|
switch(*exp->_p)
|
|
{
|
|
case '(': {
|
|
int expr,newn;
|
|
exp->_p++;
|
|
|
|
|
|
if(*exp->_p =='?') {
|
|
exp->_p++;
|
|
trex_expect(exp,':');
|
|
expr = trex_newnode(exp,OP_NOCAPEXPR);
|
|
}
|
|
else
|
|
expr = trex_newnode(exp,OP_EXPR);
|
|
newn = trex_list(exp);
|
|
exp->_nodes[expr].left = newn;
|
|
ret = expr;
|
|
trex_expect(exp,')');
|
|
}
|
|
break;
|
|
case '[':
|
|
exp->_p++;
|
|
ret = trex_class(exp);
|
|
trex_expect(exp,']');
|
|
break;
|
|
case TREX_SYMBOL_END_OF_STRING: exp->_p++; ret = trex_newnode(exp,OP_EOL);break;
|
|
case TREX_SYMBOL_ANY_CHAR: exp->_p++; ret = trex_newnode(exp,OP_DOT);break;
|
|
default:
|
|
ret = trex_charnode(exp,TRex_False);
|
|
break;
|
|
}
|
|
|
|
{
|
|
int op;
|
|
TRexBool isgreedy = TRex_False;
|
|
unsigned short p0 = 0, p1 = 0;
|
|
switch(*exp->_p){
|
|
case TREX_SYMBOL_GREEDY_ZERO_OR_MORE: p0 = 0; p1 = 0xFFFF; exp->_p++; isgreedy = TRex_True; break;
|
|
case TREX_SYMBOL_GREEDY_ONE_OR_MORE: p0 = 1; p1 = 0xFFFF; exp->_p++; isgreedy = TRex_True; break;
|
|
case TREX_SYMBOL_GREEDY_ZERO_OR_ONE: p0 = 0; p1 = 1; exp->_p++; isgreedy = TRex_True; break;
|
|
case '{':
|
|
exp->_p++;
|
|
if(!isdigit(*exp->_p)) trex_error(exp,_SC("number expected"));
|
|
p0 = (unsigned short)trex_parsenumber(exp);
|
|
/*******************************/
|
|
switch(*exp->_p) {
|
|
case '}':
|
|
p1 = p0; exp->_p++;
|
|
break;
|
|
case ',':
|
|
exp->_p++;
|
|
p1 = 0xFFFF;
|
|
if(isdigit(*exp->_p)){
|
|
p1 = (unsigned short)trex_parsenumber(exp);
|
|
}
|
|
trex_expect(exp,'}');
|
|
break;
|
|
default:
|
|
trex_error(exp,_SC(", or } expected"));
|
|
}
|
|
/*******************************/
|
|
isgreedy = TRex_True;
|
|
break;
|
|
|
|
}
|
|
if(isgreedy) {
|
|
int nnode = trex_newnode(exp,OP_GREEDY);
|
|
op = OP_GREEDY;
|
|
exp->_nodes[nnode].left = ret;
|
|
exp->_nodes[nnode].right = ((p0)<<16)|p1;
|
|
ret = nnode;
|
|
}
|
|
}
|
|
if((*exp->_p != TREX_SYMBOL_BRANCH) && (*exp->_p != ')') && (*exp->_p != TREX_SYMBOL_GREEDY_ZERO_OR_MORE) && (*exp->_p != TREX_SYMBOL_GREEDY_ONE_OR_MORE) && (*exp->_p != '\0')) {
|
|
int nnode = trex_element(exp);
|
|
exp->_nodes[ret].next = nnode;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int trex_list(TRex *exp)
|
|
{
|
|
int ret=-1,e;
|
|
if(*exp->_p == TREX_SYMBOL_BEGINNING_OF_STRING) {
|
|
exp->_p++;
|
|
ret = trex_newnode(exp,OP_BOL);
|
|
}
|
|
e = trex_element(exp);
|
|
if(ret != -1) {
|
|
exp->_nodes[ret].next = e;
|
|
}
|
|
else ret = e;
|
|
|
|
if(*exp->_p == TREX_SYMBOL_BRANCH) {
|
|
int temp,tright;
|
|
exp->_p++;
|
|
temp = trex_newnode(exp,OP_OR);
|
|
exp->_nodes[temp].left = ret;
|
|
tright = trex_list(exp);
|
|
exp->_nodes[temp].right = tright;
|
|
ret = temp;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static TRexBool trex_matchcclass(int cclass,TRexChar c)
|
|
{
|
|
switch(cclass) {
|
|
case 'a': return isalpha(c)?TRex_True:TRex_False;
|
|
case 'A': return !isalpha(c)?TRex_True:TRex_False;
|
|
case 'w': return (isalnum(c) || c == '_')?TRex_True:TRex_False;
|
|
case 'W': return (!isalnum(c) && c != '_')?TRex_True:TRex_False;
|
|
case 's': return isspace(c)?TRex_True:TRex_False;
|
|
case 'S': return !isspace(c)?TRex_True:TRex_False;
|
|
case 'd': return isdigit(c)?TRex_True:TRex_False;
|
|
case 'D': return !isdigit(c)?TRex_True:TRex_False;
|
|
case 'x': return isxdigit(c)?TRex_True:TRex_False;
|
|
case 'X': return !isxdigit(c)?TRex_True:TRex_False;
|
|
case 'c': return iscntrl(c)?TRex_True:TRex_False;
|
|
case 'C': return !iscntrl(c)?TRex_True:TRex_False;
|
|
case 'p': return ispunct(c)?TRex_True:TRex_False;
|
|
case 'P': return !ispunct(c)?TRex_True:TRex_False;
|
|
case 'l': return islower(c)?TRex_True:TRex_False;
|
|
case 'u': return isupper(c)?TRex_True:TRex_False;
|
|
}
|
|
return TRex_False; /*cannot happen*/
|
|
}
|
|
|
|
static TRexBool trex_matchclass(TRex* exp,TRexNode *node,TRexChar c)
|
|
{
|
|
do {
|
|
switch(node->type) {
|
|
case OP_RANGE:
|
|
if(c >= node->left && c <= node->right) return TRex_True;
|
|
break;
|
|
case OP_CCLASS:
|
|
if(trex_matchcclass(node->left,c)) return TRex_True;
|
|
break;
|
|
default:
|
|
if(c == node->type)return TRex_True;
|
|
}
|
|
} while((node->next != -1) && (node = &exp->_nodes[node->next]));
|
|
return TRex_False;
|
|
}
|
|
|
|
static const TRexChar *trex_matchnode(TRex* exp,TRexNode *node,const TRexChar *str,TRexNode *next)
|
|
{
|
|
|
|
TRexNodeType type = node->type;
|
|
switch(type) {
|
|
case OP_GREEDY: {
|
|
//TRexNode *greedystop = (node->next != -1) ? &exp->_nodes[node->next] : NULL;
|
|
TRexNode *greedystop = NULL;
|
|
int p0 = (node->right >> 16)&0x0000FFFF, p1 = node->right&0x0000FFFF, nmaches = 0;
|
|
const TRexChar *s=str, *good = str;
|
|
|
|
if(node->next != -1) {
|
|
greedystop = &exp->_nodes[node->next];
|
|
}
|
|
else {
|
|
greedystop = next;
|
|
}
|
|
|
|
while((nmaches == 0xFFFF || nmaches < p1)) {
|
|
|
|
const TRexChar *stop;
|
|
if(!(s = trex_matchnode(exp,&exp->_nodes[node->left],s,greedystop)))
|
|
break;
|
|
nmaches++;
|
|
good=s;
|
|
if(greedystop) {
|
|
//checks that 0 matches satisfy the expression(if so skips)
|
|
//if not would always stop(for instance if is a '?')
|
|
if(greedystop->type != OP_GREEDY ||
|
|
(greedystop->type == OP_GREEDY && ((greedystop->right >> 16)&0x0000FFFF) != 0))
|
|
{
|
|
TRexNode *gnext = NULL;
|
|
if(greedystop->next != -1) {
|
|
gnext = &exp->_nodes[greedystop->next];
|
|
}else if(next && next->next != -1){
|
|
gnext = &exp->_nodes[next->next];
|
|
}
|
|
stop = trex_matchnode(exp,greedystop,s,gnext);
|
|
if(stop) {
|
|
//if satisfied stop it
|
|
if(p0 == p1 && p0 == nmaches) break;
|
|
else if(nmaches >= p0 && p1 == 0xFFFF) break;
|
|
else if(nmaches >= p0 && nmaches <= p1) break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(s >= exp->_eol)
|
|
break;
|
|
}
|
|
if(p0 == p1 && p0 == nmaches) return good;
|
|
else if(nmaches >= p0 && p1 == 0xFFFF) return good;
|
|
else if(nmaches >= p0 && nmaches <= p1) return good;
|
|
return NULL;
|
|
}
|
|
case OP_OR: {
|
|
const TRexChar *asd = str;
|
|
TRexNode *temp=&exp->_nodes[node->left];
|
|
while( (asd = trex_matchnode(exp,temp,asd,NULL)) ) {
|
|
if(temp->next != -1)
|
|
temp = &exp->_nodes[temp->next];
|
|
else
|
|
return asd;
|
|
}
|
|
asd = str;
|
|
temp = &exp->_nodes[node->right];
|
|
while( (asd = trex_matchnode(exp,temp,asd,NULL)) ) {
|
|
if(temp->next != -1)
|
|
temp = &exp->_nodes[temp->next];
|
|
else
|
|
return asd;
|
|
}
|
|
return NULL;
|
|
break;
|
|
}
|
|
case OP_EXPR:
|
|
case OP_NOCAPEXPR:{
|
|
TRexNode *n = &exp->_nodes[node->left];
|
|
const TRexChar *cur = str;
|
|
int capture = -1;
|
|
if(node->type != OP_NOCAPEXPR && node->right == exp->_currsubexp) {
|
|
capture = exp->_currsubexp;
|
|
exp->_matches[capture].begin = cur;
|
|
exp->_currsubexp++;
|
|
}
|
|
|
|
do {
|
|
TRexNode *subnext = NULL;
|
|
if(n->next != -1) {
|
|
subnext = &exp->_nodes[n->next];
|
|
}else {
|
|
subnext = next;
|
|
}
|
|
if(!(cur = trex_matchnode(exp,n,cur,subnext))) {
|
|
if(capture != -1){
|
|
exp->_matches[capture].begin = 0;
|
|
exp->_matches[capture].len = 0;
|
|
}
|
|
return NULL;
|
|
}
|
|
} while((n->next != -1) && (n = &exp->_nodes[n->next]));
|
|
|
|
if(capture != -1)
|
|
exp->_matches[capture].len = cur - exp->_matches[capture].begin;
|
|
return cur;
|
|
}
|
|
case OP_WB:
|
|
if(str == exp->_bol && !isspace(*str)
|
|
|| (str == exp->_eol && !isspace(*(str-1)))
|
|
|| (!isspace(*str) && isspace(*(str+1)))
|
|
|| (isspace(*str) && !isspace(*(str+1))) ) {
|
|
return (node->left == 'b')?str:NULL;
|
|
}
|
|
return (node->left == 'b')?NULL:str;
|
|
case OP_BOL:
|
|
if(str == exp->_bol) return str;
|
|
return NULL;
|
|
case OP_EOL:
|
|
if(str == exp->_eol) return str;
|
|
return NULL;
|
|
case OP_DOT:{
|
|
*str++;
|
|
}
|
|
return str;
|
|
case OP_NCLASS:
|
|
case OP_CLASS:
|
|
if(trex_matchclass(exp,&exp->_nodes[node->left],*str)?(type == OP_CLASS?TRex_True:TRex_False):(type == OP_NCLASS?TRex_True:TRex_False)) {
|
|
*str++;
|
|
return str;
|
|
}
|
|
return NULL;
|
|
case OP_CCLASS:
|
|
if(trex_matchcclass(node->left,*str)) {
|
|
*str++;
|
|
return str;
|
|
}
|
|
return NULL;
|
|
default: /* char */
|
|
if(*str != node->type) return NULL;
|
|
*str++;
|
|
return str;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* public api */
|
|
TRex *trex_compile(const TRexChar *pattern,const TRexChar **error)
|
|
{
|
|
TRex *exp = (TRex *)malloc(sizeof(TRex));
|
|
exp->_eol = exp->_bol = NULL;
|
|
exp->_p = pattern;
|
|
exp->_nallocated = (int)scstrlen(pattern) * sizeof(TRexChar);
|
|
exp->_nodes = (TRexNode *)malloc(exp->_nallocated * sizeof(TRexNode));
|
|
exp->_nsize = 0;
|
|
exp->_matches = 0;
|
|
exp->_nsubexpr = 0;
|
|
exp->_first = trex_newnode(exp,OP_EXPR);
|
|
exp->_error = error;
|
|
exp->_jmpbuf = malloc(sizeof(jmp_buf));
|
|
if(setjmp(*((jmp_buf*)exp->_jmpbuf)) == 0) {
|
|
int res = trex_list(exp);
|
|
exp->_nodes[exp->_first].left = res;
|
|
if(*exp->_p!='\0')
|
|
trex_error(exp,_SC("unexpected character"));
|
|
#ifdef _DEBUG
|
|
{
|
|
int nsize,i;
|
|
TRexNode *t;
|
|
nsize = exp->_nsize;
|
|
t = &exp->_nodes[0];
|
|
scprintf(_SC("\n"));
|
|
for(i = 0;i < nsize; i++) {
|
|
if(exp->_nodes[i].type>MAX_CHAR)
|
|
scprintf(_SC("[%02d] %10s "),i,g_nnames[exp->_nodes[i].type-MAX_CHAR]);
|
|
else
|
|
scprintf(_SC("[%02d] %10c "),i,exp->_nodes[i].type);
|
|
scprintf(_SC("left %02d right %02d next %02d\n"),exp->_nodes[i].left,exp->_nodes[i].right,exp->_nodes[i].next);
|
|
}
|
|
scprintf(_SC("\n"));
|
|
}
|
|
#endif
|
|
exp->_matches = (TRexMatch *) malloc(exp->_nsubexpr * sizeof(TRexMatch));
|
|
memset(exp->_matches,0,exp->_nsubexpr * sizeof(TRexMatch));
|
|
}
|
|
else{
|
|
trex_free(exp);
|
|
return NULL;
|
|
}
|
|
return exp;
|
|
}
|
|
|
|
void trex_free(TRex *exp)
|
|
{
|
|
if(exp) {
|
|
if(exp->_nodes) free(exp->_nodes);
|
|
if(exp->_jmpbuf) free(exp->_jmpbuf);
|
|
if(exp->_matches) free(exp->_matches);
|
|
free(exp);
|
|
}
|
|
}
|
|
|
|
TRexBool trex_match(TRex* exp,const TRexChar* text)
|
|
{
|
|
const TRexChar* res = NULL;
|
|
exp->_bol = text;
|
|
exp->_eol = text + scstrlen(text);
|
|
exp->_currsubexp = 0;
|
|
res = trex_matchnode(exp,exp->_nodes,text,NULL);
|
|
if(res == NULL || res != exp->_eol)
|
|
return TRex_False;
|
|
return TRex_True;
|
|
}
|
|
|
|
TRexBool trex_searchrange(TRex* exp,const TRexChar* text_begin,const TRexChar* text_end,const TRexChar** out_begin, const TRexChar** out_end)
|
|
{
|
|
const TRexChar *cur = NULL;
|
|
int node = exp->_first;
|
|
if(text_begin >= text_end) return TRex_False;
|
|
exp->_bol = text_begin;
|
|
exp->_eol = text_end;
|
|
do {
|
|
cur = text_begin;
|
|
while(node != -1) {
|
|
exp->_currsubexp = 0;
|
|
cur = trex_matchnode(exp,&exp->_nodes[node],cur,NULL);
|
|
if(!cur)
|
|
break;
|
|
node = exp->_nodes[node].next;
|
|
}
|
|
*text_begin++;
|
|
} while(cur == NULL && text_begin != text_end);
|
|
|
|
if(cur == NULL)
|
|
return TRex_False;
|
|
|
|
--text_begin;
|
|
|
|
if(out_begin) *out_begin = text_begin;
|
|
if(out_end) *out_end = cur;
|
|
return TRex_True;
|
|
}
|
|
|
|
TRexBool trex_search(TRex* exp,const TRexChar* text, const TRexChar** out_begin, const TRexChar** out_end)
|
|
{
|
|
return trex_searchrange(exp,text,text + scstrlen(text),out_begin,out_end);
|
|
}
|
|
|
|
int trex_getsubexpcount(TRex* exp)
|
|
{
|
|
return exp->_nsubexpr;
|
|
}
|
|
|
|
TRexBool trex_getsubexp(TRex* exp, int n, TRexMatch *subexp)
|
|
{
|
|
if( n<0 || n >= exp->_nsubexpr) return TRex_False;
|
|
*subexp = exp->_matches[n];
|
|
return TRex_True;
|
|
}
|
|
|