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@ -1,5 +1,5 @@ |
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/*
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** $Id: lstrlib.c,v 1.55 2000/10/20 16:39:03 roberto Exp roberto $ |
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** $Id: lstrlib.c,v 1.56 2000/10/27 16:15:53 roberto Exp roberto $ |
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** Standard library for string operations and pattern-matching |
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** See Copyright Notice in lua.h |
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*/ |
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@ -121,46 +121,47 @@ static int str_char (lua_State *L) { |
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#endif |
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struct Capture { |
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typedef struct MatchState { |
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const char *src_end; /* end ('\0') of source string */ |
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int level; /* total number of captures (finished or unfinished) */ |
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struct { |
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const char *init; |
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long len; /* -1 signals unfinished capture */ |
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} capture[MAX_CAPTURES]; |
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}; |
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lua_State *L; |
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} MatchState; |
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#define ESC '%' |
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#define SPECIALS "^$*+?.([%-" |
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static int check_capture (lua_State *L, int l, struct Capture *cap) { |
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static int check_capture (MatchState *ms, int l) { |
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l -= '1'; |
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if (!(0 <= l && l < cap->level && cap->capture[l].len != -1)) |
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lua_error(L, "invalid capture index"); |
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if (!(0 <= l && l < ms->level && ms->capture[l].len != -1)) |
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lua_error(ms->L, "invalid capture index"); |
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return l; |
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} |
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static int capture_to_close (lua_State *L, struct Capture *cap) { |
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int level = cap->level; |
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static int capture_to_close (MatchState *ms) { |
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int level = ms->level; |
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for (level--; level>=0; level--) |
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if (cap->capture[level].len == -1) return level; |
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lua_error(L, "invalid pattern capture"); |
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if (ms->capture[level].len == -1) return level; |
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lua_error(ms->L, "invalid pattern capture"); |
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return 0; /* to avoid warnings */ |
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} |
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const char *luaI_classend (lua_State *L, const char *p) { |
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static const char *luaI_classend (MatchState *ms, const char *p) { |
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switch (*p++) { |
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case ESC: |
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if (*p == '\0') lua_error(L, "malformed pattern (ends with `%')"); |
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if (*p == '\0') lua_error(ms->L, "malformed pattern (ends with `%')"); |
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return p+1; |
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case '[': |
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if (*p == '^') p++; |
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do { /* look for a ']' */ |
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if (*p == '\0') lua_error(L, "malformed pattern (missing `]')"); |
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if (*p == '\0') lua_error(ms->L, "malformed pattern (missing `]')"); |
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if (*(p++) == ESC && *p != '\0') p++; /* skip escapes (e.g. '%]') */ |
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} while (*p != ']'); |
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return p+1; |
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@ -189,7 +190,6 @@ static int match_class (int c, int cl) { |
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} |
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static int matchbracketclass (int c, const char *p, const char *endclass) { |
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int sig = 1; |
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if (*(p+1) == '^') { |
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@ -213,8 +213,7 @@ static int matchbracketclass (int c, const char *p, const char *endclass) { |
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} |
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int luaI_singlematch (int c, const char *p, const char *ep) { |
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static int luaI_singlematch (int c, const char *p, const char *ep) { |
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switch (*p) { |
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case '.': /* matches any char */ |
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return 1; |
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@ -228,20 +227,18 @@ int luaI_singlematch (int c, const char *p, const char *ep) { |
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} |
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static const char *match (lua_State *L, const char *s, const char *p, |
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struct Capture *cap); |
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static const char *match (MatchState *ms, const char *s, const char *p); |
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static const char *matchbalance (lua_State *L, const char *s, const char *p, |
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struct Capture *cap) { |
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static const char *matchbalance (MatchState *ms, const char *s, const char *p) { |
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if (*p == 0 || *(p+1) == 0) |
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lua_error(L, "unbalanced pattern"); |
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lua_error(ms->L, "unbalanced pattern"); |
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if (*s != *p) return NULL; |
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else { |
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int b = *p; |
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int e = *(p+1); |
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int cont = 1; |
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while (++s < cap->src_end) { |
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while (++s < ms->src_end) { |
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if (*s == e) { |
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if (--cont == 0) return s+1; |
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} |
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@ -252,14 +249,14 @@ static const char *matchbalance (lua_State *L, const char *s, const char *p, |
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} |
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static const char *max_expand (lua_State *L, const char *s, const char *p, |
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const char *ep, struct Capture *cap) { |
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static const char *max_expand (MatchState *ms, const char *s, const char *p, |
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const char *ep) { |
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long i = 0; /* counts maximum expand for item */ |
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while ((s+i)<cap->src_end && luaI_singlematch((unsigned char)*(s+i), p, ep)) |
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while ((s+i)<ms->src_end && luaI_singlematch((unsigned char)*(s+i), p, ep)) |
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i++; |
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/* keeps trying to match with the maximum repetitions */ |
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while (i>=0) { |
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const char *res = match(L, (s+i), ep+1, cap); |
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const char *res = match(ms, (s+i), ep+1); |
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if (res) return res; |
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i--; /* else didn't match; reduce 1 repetition to try again */ |
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} |
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@ -267,100 +264,96 @@ static const char *max_expand (lua_State *L, const char *s, const char *p, |
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} |
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static const char *min_expand (lua_State *L, const char *s, const char *p, |
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const char *ep, struct Capture *cap) { |
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static const char *min_expand (MatchState *ms, const char *s, const char *p, |
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const char *ep) { |
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for (;;) { |
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const char *res = match(L, s, ep+1, cap); |
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const char *res = match(ms, s, ep+1); |
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if (res != NULL) |
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return res; |
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else if (s<cap->src_end && luaI_singlematch((unsigned char)*s, p, ep)) |
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else if (s<ms->src_end && luaI_singlematch((unsigned char)*s, p, ep)) |
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s++; /* try with one more repetition */ |
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else return NULL; |
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} |
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} |
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static const char *start_capture (lua_State *L, const char *s, const char *p, |
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struct Capture *cap) { |
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static const char *start_capture (MatchState *ms, const char *s, const char *p){ |
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const char *res; |
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int level = cap->level; |
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if (level >= MAX_CAPTURES) lua_error(L, "too many captures"); |
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cap->capture[level].init = s; |
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cap->capture[level].len = -1; |
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cap->level = level+1; |
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if ((res=match(L, s, p+1, cap)) == NULL) /* match failed? */ |
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cap->level--; /* undo capture */ |
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int level = ms->level; |
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if (level >= MAX_CAPTURES) lua_error(ms->L, "too many captures"); |
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ms->capture[level].init = s; |
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ms->capture[level].len = -1; |
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ms->level = level+1; |
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if ((res=match(ms, s, p+1)) == NULL) /* match failed? */ |
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ms->level--; /* undo capture */ |
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return res; |
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} |
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static const char *end_capture (lua_State *L, const char *s, const char *p, |
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struct Capture *cap) { |
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int l = capture_to_close(L, cap); |
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static const char *end_capture (MatchState *ms, const char *s, const char *p) { |
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int l = capture_to_close(ms); |
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const char *res; |
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cap->capture[l].len = s - cap->capture[l].init; /* close capture */ |
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if ((res = match(L, s, p+1, cap)) == NULL) /* match failed? */ |
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cap->capture[l].len = -1; /* undo capture */ |
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ms->capture[l].len = s - ms->capture[l].init; /* close capture */ |
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if ((res = match(ms, s, p+1)) == NULL) /* match failed? */ |
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ms->capture[l].len = -1; /* undo capture */ |
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return res; |
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} |
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static const char *match_capture (lua_State *L, const char *s, int level, |
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struct Capture *cap) { |
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int l = check_capture(L, level, cap); |
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size_t len = cap->capture[l].len; |
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if ((size_t)(cap->src_end-s) >= len && |
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memcmp(cap->capture[l].init, s, len) == 0) |
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static const char *match_capture (MatchState *ms, const char *s, int level) { |
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int l = check_capture(ms, level); |
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size_t len = ms->capture[l].len; |
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if ((size_t)(ms->src_end-s) >= len && |
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memcmp(ms->capture[l].init, s, len) == 0) |
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return s+len; |
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else return NULL; |
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} |
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static const char *match (lua_State *L, const char *s, const char *p, |
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struct Capture *cap) { |
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static const char *match (MatchState *ms, const char *s, const char *p) { |
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init: /* using goto's to optimize tail recursion */ |
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switch (*p) { |
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case '(': /* start capture */ |
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return start_capture(L, s, p, cap); |
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return start_capture(ms, s, p); |
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case ')': /* end capture */ |
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return end_capture(L, s, p, cap); |
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return end_capture(ms, s, p); |
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case ESC: /* may be %[0-9] or %b */ |
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if (isdigit((unsigned char)(*(p+1)))) { /* capture? */ |
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s = match_capture(L, s, *(p+1), cap); |
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s = match_capture(ms, s, *(p+1)); |
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if (s == NULL) return NULL; |
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p+=2; goto init; /* else return match(L, s, p+2, cap) */ |
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p+=2; goto init; /* else return match(ms, s, p+2) */ |
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} |
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else if (*(p+1) == 'b') { /* balanced string? */ |
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s = matchbalance(L, s, p+2, cap); |
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s = matchbalance(ms, s, p+2); |
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if (s == NULL) return NULL; |
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p+=4; goto init; /* else return match(L, s, p+4, cap); */ |
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p+=4; goto init; /* else return match(ms, s, p+4); */ |
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} |
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else goto dflt; /* case default */ |
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case '\0': /* end of pattern */ |
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return s; /* match succeeded */ |
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case '$': |
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if (*(p+1) == '\0') /* is the '$' the last char in pattern? */ |
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return (s == cap->src_end) ? s : NULL; /* check end of string */ |
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return (s == ms->src_end) ? s : NULL; /* check end of string */ |
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else goto dflt; |
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default: dflt: { /* it is a pattern item */ |
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const char *ep = luaI_classend(L, p); /* points to what is next */ |
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int m = s<cap->src_end && luaI_singlematch((unsigned char)*s, p, ep); |
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const char *ep = luaI_classend(ms, p); /* points to what is next */ |
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int m = s<ms->src_end && luaI_singlematch((unsigned char)*s, p, ep); |
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switch (*ep) { |
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case '?': { /* optional */ |
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const char *res; |
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if (m && ((res=match(L, s+1, ep+1, cap)) != NULL)) |
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if (m && ((res=match(ms, s+1, ep+1)) != NULL)) |
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return res; |
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p=ep+1; goto init; /* else return match(L, s, ep+1, cap); */ |
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p=ep+1; goto init; /* else return match(ms, s, ep+1); */ |
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} |
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case '*': /* 0 or more repetitions */ |
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return max_expand(L, s, p, ep, cap); |
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return max_expand(ms, s, p, ep); |
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case '+': /* 1 or more repetitions */ |
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return (m ? max_expand(L, s+1, p, ep, cap) : NULL); |
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return (m ? max_expand(ms, s+1, p, ep) : NULL); |
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case '-': /* 0 or more repetitions (minimum) */ |
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return min_expand(L, s, p, ep, cap); |
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return min_expand(ms, s, p, ep); |
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default: |
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if (!m) return NULL; |
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s++; p=ep; goto init; /* else return match(L, s+1, ep, cap); */ |
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s++; p=ep; goto init; /* else return match(ms, s+1, ep); */ |
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} |
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} |
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} |
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@ -390,15 +383,15 @@ static const char *lmemfind (const char *s1, size_t l1, |
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} |
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static int push_captures (lua_State *L, struct Capture *cap) { |
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static int push_captures (MatchState *ms) { |
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int i; |
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luaL_checkstack(L, cap->level, "too many captures"); |
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for (i=0; i<cap->level; i++) { |
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int l = cap->capture[i].len; |
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if (l == -1) lua_error(L, "unfinished capture"); |
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lua_pushlstring(L, cap->capture[i].init, l); |
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luaL_checkstack(ms->L, ms->level, "too many captures"); |
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for (i=0; i<ms->level; i++) { |
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int l = ms->capture[i].len; |
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if (l == -1) lua_error(ms->L, "unfinished capture"); |
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lua_pushlstring(ms->L, ms->capture[i].init, l); |
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} |
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return cap->level; /* number of strings pushed */ |
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return ms->level; /* number of strings pushed */ |
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} |
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@ -407,7 +400,6 @@ static int str_find (lua_State *L) { |
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const char *s = luaL_check_lstr(L, 1, &l1); |
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const char *p = luaL_check_lstr(L, 2, &l2); |
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long init = posrelat(luaL_opt_long(L, 3, 1), l1) - 1; |
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struct Capture cap; |
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luaL_arg_check(L, 0 <= init && (size_t)init <= l1, 3, "out of range"); |
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if (lua_gettop(L) > 3 || /* extra argument? */ |
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strpbrk(p, SPECIALS) == NULL) { /* or no special characters? */ |
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@ -419,25 +411,28 @@ static int str_find (lua_State *L) { |
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} |
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} |
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else { |
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MatchState ms; |
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int anchor = (*p == '^') ? (p++, 1) : 0; |
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const char *s1=s+init; |
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cap.src_end = s+l1; |
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ms.L = L; |
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ms.src_end = s+l1; |
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do { |
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const char *res; |
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cap.level = 0; |
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if ((res=match(L, s1, p, &cap)) != NULL) { |
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ms.level = 0; |
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if ((res=match(&ms, s1, p)) != NULL) { |
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lua_pushnumber(L, s1-s+1); /* start */ |
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lua_pushnumber(L, res-s); /* end */ |
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return push_captures(L, &cap) + 2; |
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return push_captures(&ms) + 2; |
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} |
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} while (s1++<cap.src_end && !anchor); |
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} while (s1++<ms.src_end && !anchor); |
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} |
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lua_pushnil(L); /* not found */ |
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return 1; |
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} |
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static void add_s (lua_State *L, luaL_Buffer *b, struct Capture *cap) { |
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static void add_s (MatchState *ms, luaL_Buffer *b) { |
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lua_State *L = ms->L; |
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if (lua_isstring(L, 3)) { |
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const char *news = lua_tostring(L, 3); |
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size_t l = lua_strlen(L, 3); |
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@ -450,8 +445,8 @@ static void add_s (lua_State *L, luaL_Buffer *b, struct Capture *cap) { |
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if (!isdigit((unsigned char)news[i])) |
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luaL_putchar(b, news[i]); |
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else { |
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int level = check_capture(L, news[i], cap); |
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luaL_addlstring(b, cap->capture[level].init, cap->capture[level].len); |
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int level = check_capture(ms, news[i]); |
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luaL_addlstring(b, ms->capture[level].init, ms->capture[level].len); |
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} |
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} |
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} |
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@ -459,7 +454,7 @@ static void add_s (lua_State *L, luaL_Buffer *b, struct Capture *cap) { |
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else { /* is a function */ |
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int n; |
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lua_pushvalue(L, 3); |
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n = push_captures(L, cap); |
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n = push_captures(ms); |
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|
lua_rawcall(L, n, 1); |
|
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if (lua_isstring(L, -1)) |
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luaL_addvalue(b); /* add return to accumulated result */ |
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@ -476,29 +471,30 @@ static int str_gsub (lua_State *L) { |
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int max_s = luaL_opt_int(L, 4, srcl+1); |
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int anchor = (*p == '^') ? (p++, 1) : 0; |
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|
int n = 0; |
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|
struct Capture cap; |
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|
|
MatchState ms; |
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|
luaL_Buffer b; |
|
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|
luaL_arg_check(L, |
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lua_gettop(L) >= 3 && (lua_isstring(L, 3) || lua_isfunction(L, 3)), |
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3, "string or function expected"); |
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|
luaL_buffinit(L, &b); |
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cap.src_end = src+srcl; |
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|
ms.L = L; |
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|
ms.src_end = src+srcl; |
|
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|
while (n < max_s) { |
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|
const char *e; |
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|
cap.level = 0; |
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e = match(L, src, p, &cap); |
|
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|
ms.level = 0; |
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|
e = match(&ms, src, p); |
|
|
|
if (e) { |
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|
n++; |
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|
add_s(L, &b, &cap); |
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|
add_s(&ms, &b); |
|
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|
} |
|
|
|
if (e && e>src) /* non empty match? */ |
|
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|
src = e; /* skip it */ |
|
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|
else if (src < cap.src_end) |
|
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|
else if (src < ms.src_end) |
|
|
|
luaL_putchar(&b, *src++); |
|
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|
else break; |
|
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|
if (anchor) break; |
|
|
|
} |
|
|
|
luaL_addlstring(&b, src, cap.src_end-src); |
|
|
|
luaL_addlstring(&b, src, ms.src_end-src); |
|
|
|
luaL_pushresult(&b); |
|
|
|
lua_pushnumber(L, n); /* number of substitutions */ |
|
|
|
return 2; |
|
|
@ -507,6 +503,12 @@ static int str_gsub (lua_State *L) { |
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|
/* }====================================================== */ |
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|
|
|
|
|
|
|
|
/* maximum size of each formatted item (> len(format('%99.99f', -1e308))) */ |
|
|
|
#define MAX_ITEM 512 |
|
|
|
/* maximum size of each format specification (such as '%-099.99d') */ |
|
|
|
#define MAX_FORMAT 20 |
|
|
|
|
|
|
|
|
|
|
|
static void luaI_addquoted (lua_State *L, luaL_Buffer *b, int arg) { |
|
|
|
size_t l; |
|
|
|
const char *s = luaL_check_lstr(L, arg, &l); |
|
|
@ -525,10 +527,29 @@ static void luaI_addquoted (lua_State *L, luaL_Buffer *b, int arg) { |
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|
|
luaL_putchar(b, '"'); |
|
|
|
} |
|
|
|
|
|
|
|
/* maximum size of each formatted item (> len(format('%99.99f', -1e308))) */ |
|
|
|
#define MAX_ITEM 512 |
|
|
|
/* maximum size of each format specification (such as '%-099.99d') */ |
|
|
|
#define MAX_FORMAT 20 |
|
|
|
|
|
|
|
static const char *scanformat (lua_State *L, const char *strfrmt, char *form, |
|
|
|
int *hasprecision) { |
|
|
|
const char *p = strfrmt; |
|
|
|
while (strchr("-+ #0", *p)) p++; /* skip flags */ |
|
|
|
if (isdigit((unsigned char)*p)) p++; /* skip width */ |
|
|
|
if (isdigit((unsigned char)*p)) p++; /* (2 digits at most) */ |
|
|
|
if (*p == '.') { |
|
|
|
p++; |
|
|
|
*hasprecision = 1; |
|
|
|
if (isdigit((unsigned char)*p)) p++; /* skip precision */ |
|
|
|
if (isdigit((unsigned char)*p)) p++; /* (2 digits at most) */ |
|
|
|
} |
|
|
|
if (isdigit((unsigned char)*p)) |
|
|
|
lua_error(L, "invalid format (width or precision too long)"); |
|
|
|
if (p-strfrmt+2 > MAX_FORMAT) /* +2 to include `%' and the specifier */ |
|
|
|
lua_error(L, "invalid format (too long)"); |
|
|
|
form[0] = '%'; |
|
|
|
strncpy(form+1, strfrmt, p-strfrmt+1); |
|
|
|
form[p-strfrmt+2] = 0; |
|
|
|
return p; |
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
static int str_format (lua_State *L) { |
|
|
|
int arg = 1; |
|
|
@ -541,24 +562,15 @@ static int str_format (lua_State *L) { |
|
|
|
else if (*++strfrmt == '%') |
|
|
|
luaL_putchar(&b, *strfrmt++); /* %% */ |
|
|
|
else { /* format item */ |
|
|
|
struct Capture cap; |
|
|
|
char form[MAX_FORMAT]; /* to store the format ('%...') */ |
|
|
|
char form[MAX_FORMAT]; /* to store the format (`%...') */ |
|
|
|
char buff[MAX_ITEM]; /* to store the formatted item */ |
|
|
|
const char *initf = strfrmt; |
|
|
|
form[0] = '%'; |
|
|
|
if (isdigit((unsigned char)*initf) && *(initf+1) == '$') { |
|
|
|
arg = *initf - '0'; |
|
|
|
initf += 2; /* skip the 'n$' */ |
|
|
|
int hasprecision = 0; |
|
|
|
if (isdigit((unsigned char)*strfrmt) && *(strfrmt+1) == '$') { |
|
|
|
arg = *strfrmt - '0'; |
|
|
|
strfrmt += 2; /* skip the `n$' */ |
|
|
|
} |
|
|
|
arg++; |
|
|
|
cap.src_end = strfrmt+strlen(strfrmt)+1; |
|
|
|
cap.level = 0; |
|
|
|
strfrmt = match(L, initf, "[-+ #0]*(%d*)%.?(%d*)", &cap); |
|
|
|
if (cap.capture[0].len > 2 || cap.capture[1].len > 2 || /* < 100? */ |
|
|
|
strfrmt-initf > MAX_FORMAT-2) |
|
|
|
lua_error(L, "invalid format (width or precision too long)"); |
|
|
|
strncpy(form+1, initf, strfrmt-initf+1); /* +1 to include conversion */ |
|
|
|
form[strfrmt-initf+2] = 0; |
|
|
|
strfrmt = scanformat(L, strfrmt, form, &hasprecision); |
|
|
|
switch (*strfrmt++) { |
|
|
|
case 'c': case 'd': case 'i': |
|
|
|
sprintf(buff, form, luaL_check_int(L, arg)); |
|
|
@ -575,7 +587,7 @@ static int str_format (lua_State *L) { |
|
|
|
case 's': { |
|
|
|
size_t l; |
|
|
|
const char *s = luaL_check_lstr(L, arg, &l); |
|
|
|
if (cap.capture[1].len == 0 && l >= 100) { |
|
|
|
if (!hasprecision && l >= 100) { |
|
|
|
/* no precision and string is too long to be formatted;
|
|
|
|
keep original string */ |
|
|
|
lua_pushvalue(L, arg); |
|
|
@ -587,7 +599,7 @@ static int str_format (lua_State *L) { |
|
|
|
break; |
|
|
|
} |
|
|
|
} |
|
|
|
default: /* also treat cases 'pnLlh' */ |
|
|
|
default: /* also treat cases `pnLlh' */ |
|
|
|
lua_error(L, "invalid option in `format'"); |
|
|
|
} |
|
|
|
luaL_addlstring(&b, buff, strlen(buff)); |
|
|
@ -605,7 +617,6 @@ static const struct luaL_reg strlib[] = { |
|
|
|
{"strupper", str_upper}, |
|
|
|
{"strchar", str_char}, |
|
|
|
{"strrep", str_rep}, |
|
|
|
{"ascii", str_byte}, /* for compatibility with 3.0 and earlier */ |
|
|
|
{"strbyte", str_byte}, |
|
|
|
{"format", str_format}, |
|
|
|
{"strfind", str_find}, |
|
|
|