circuitpython/extmod/re1.5/compilecode.c

253 lines
6.5 KiB
C

// Copyright 2014 Paul Sokolovsky.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "re1.5.h"
#define INSERT_CODE(at, num, pc) \
((code ? memmove(code + at + num, code + at, pc - at) : 0), pc += num)
#define REL(at, to) (to - at - 2)
#define EMIT(at, byte) (code ? (code[at] = byte) : (at))
#define PC (prog->bytelen)
static char unescape(char c) {
switch (c) {
case 'a':
return '\a';
case 'b':
return '\b';
case 'f':
return '\f';
case 'n':
return '\n';
case 'r':
return '\r';
case 'v':
return '\v';
case 'x':
return '\\';
default:
return c;
}
}
static const char *_compilecode(const char *re, ByteProg *prog, int sizecode)
{
char *code = sizecode ? NULL : prog->insts;
int start = PC;
int term = PC;
int alt_label = 0;
for (; *re && *re != ')'; re++) {
switch (*re) {
case '\\':
re++;
if (!*re) return NULL; // Trailing backslash
term = PC;
if ((*re | 0x20) == 'd' || (*re | 0x20) == 's' || (*re | 0x20) == 'w') {
EMIT(PC++, NamedClass);
EMIT(PC++, *re);
} else {
EMIT(PC++, Char);
EMIT(PC++, unescape(*re));
}
prog->len++;
break;
default:
term = PC;
EMIT(PC++, Char);
EMIT(PC++, *re);
prog->len++;
break;
case '.':
term = PC;
EMIT(PC++, Any);
prog->len++;
break;
case '[': {
int cnt;
term = PC;
re++;
if (*re == '^') {
EMIT(PC++, ClassNot);
re++;
} else {
EMIT(PC++, Class);
}
PC++; // Skip # of pair byte
prog->len++;
for (cnt = 0; *re != ']'; re++, cnt++) {
if (!*re) return NULL;
if (*re == '\\') {
re += 1;
EMIT(PC++, unescape(*re));
} else {
EMIT(PC++, *re);
}
if (re[1] == '-' && re[2] != ']') {
re += 2;
}
if (*re == '\\') {
re += 1;
EMIT(PC++, unescape(*re));
} else {
EMIT(PC++, *re);
}
}
EMIT(term + 1, cnt);
break;
}
case '(': {
term = PC;
int sub = 0;
int capture = re[1] != '?' || re[2] != ':';
if (capture) {
sub = ++prog->sub;
EMIT(PC++, Save);
EMIT(PC++, 2 * sub);
prog->len++;
} else {
re += 2;
}
re = _compilecode(re + 1, prog, sizecode);
if (re == NULL || *re != ')') return NULL; // error, or no matching paren
if (capture) {
EMIT(PC++, Save);
EMIT(PC++, 2 * sub + 1);
prog->len++;
}
break;
}
case '?':
if (PC == term) return NULL; // nothing to repeat
INSERT_CODE(term, 2, PC);
if (re[1] == '?') {
EMIT(term, RSplit);
re++;
} else {
EMIT(term, Split);
}
EMIT(term + 1, REL(term, PC));
prog->len++;
term = PC;
break;
case '*':
if (PC == term) return NULL; // nothing to repeat
INSERT_CODE(term, 2, PC);
EMIT(PC, Jmp);
EMIT(PC + 1, REL(PC, term));
PC += 2;
if (re[1] == '?') {
EMIT(term, RSplit);
re++;
} else {
EMIT(term, Split);
}
EMIT(term + 1, REL(term, PC));
prog->len += 2;
term = PC;
break;
case '+':
if (PC == term) return NULL; // nothing to repeat
if (re[1] == '?') {
EMIT(PC, Split);
re++;
} else {
EMIT(PC, RSplit);
}
EMIT(PC + 1, REL(PC, term));
PC += 2;
prog->len++;
term = PC;
break;
case '|':
if (alt_label) {
EMIT(alt_label, REL(alt_label, PC) + 1);
}
INSERT_CODE(start, 2, PC);
EMIT(PC++, Jmp);
alt_label = PC++;
EMIT(start, Split);
EMIT(start + 1, REL(start, PC));
prog->len += 2;
term = PC;
break;
case '^':
EMIT(PC++, Bol);
prog->len++;
term = PC;
break;
case '$':
EMIT(PC++, Eol);
prog->len++;
term = PC;
break;
}
}
if (alt_label) {
EMIT(alt_label, REL(alt_label, PC) + 1);
}
return re;
}
int re1_5_sizecode(const char *re)
{
ByteProg dummyprog = {
// Save 0, Save 1, Match; more bytes for "search" (vs "match") prefix code
.bytelen = 5 + NON_ANCHORED_PREFIX
};
if (_compilecode(re, &dummyprog, /*sizecode*/1) == NULL) return -1;
return dummyprog.bytelen;
}
int re1_5_compilecode(ByteProg *prog, const char *re)
{
prog->len = 0;
prog->bytelen = 0;
prog->sub = 0;
// Add code to implement non-anchored operation ("search"),
// for anchored operation ("match"), this code will be just skipped.
// TODO: Implement search in much more efficient manner
prog->insts[prog->bytelen++] = RSplit;
prog->insts[prog->bytelen++] = 3;
prog->insts[prog->bytelen++] = Any;
prog->insts[prog->bytelen++] = Jmp;
prog->insts[prog->bytelen++] = -5;
prog->len += 3;
prog->insts[prog->bytelen++] = Save;
prog->insts[prog->bytelen++] = 0;
prog->len++;
re = _compilecode(re, prog, /*sizecode*/0);
if (re == NULL || *re) return 1;
prog->insts[prog->bytelen++] = Save;
prog->insts[prog->bytelen++] = 1;
prog->len++;
prog->insts[prog->bytelen++] = Match;
prog->len++;
return 0;
}
#if 0
int main(int argc, char *argv[])
{
int pc = 0;
ByteProg *code = re1_5_compilecode(argv[1]);
re1_5_dumpcode(code);
}
#endif