diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/lstrlib.js | 52 |
1 files changed, 35 insertions, 17 deletions
diff --git a/src/lstrlib.js b/src/lstrlib.js index 64870d6..cedb403 100644 --- a/src/lstrlib.js +++ b/src/lstrlib.js @@ -10,7 +10,8 @@ const lua = require('./lua.js'); const luaconf = require('./luaconf.js'); const CT = lua.constant_types; -const L_ESC = '%'.charCodeAt(0); +const sL_ESC = '%'; +const L_ESC = sL_ESC.charCodeAt(0); // (sizeof(size_t) < sizeof(int) ? MAX_SIZET : (size_t)(INT_MAX)) const MAXSIZE = Number.MAX_SAFE_INTEGER; @@ -836,13 +837,27 @@ class MatchState { this.L = L; this.matchdepth = NaN; /* control for recursive depth */ this.level = NaN; /* total number of captures (finished or unfinished) */ - this.captures = []; + this.capture = []; } } +const check_capture = function(ms, l) { + l = String.fromCharCode(l - '1'.charCodeAt(0)); + if (l < 0 || l >= ms.level || ms.capture[l].len === CAP_UNFINISHED) + return lauxlib.luaL_error(ms.L, `invalid capture index %${l + 1}`); + return l; +}; + +const capture_to_close = function(ms) { + let level = ms.level; + for (level--; level >= 0; level--) + if (ms.capture[level].len === CAP_UNFINISHED) return level; + return lauxlib.luaL_error(ms.L, "invalid pattern capture"); +}; + const classend = function(ms, p) { switch(ms.p.charAt(p++)) { - case L_ESC: { + case sL_ESC: { if (p === ms.p_end) lauxlib.luaL_error(ms.L, "malformed pattern (ends with '%')"); return p + 1; @@ -863,12 +878,12 @@ const classend = function(ms, p) { } }; -const match_class = function(ms, c, cl) { +const match_class = function(c, cl) { let res; switch (cl.toLowerCase()) { case 'a' : res = isalpha(c); break; case 'c' : res = iscntrl(c); break; - case 'd' : res = isdigit(c); break; + case 'd' : res = isdigit(c.charCodeAt(0)); break; case 'g' : res = isgraph(c); break; case 'l' : res = islower(c); break; case 'p' : res = ispunct(c); break; @@ -909,7 +924,7 @@ const singlematch = function(ms, s, p, ep) { let c = ms.src.charAt(s); switch (ms.p.charAt(p)) { case '.': return true; /* matches any char */ - case L_ESC: return match_class(c, ms.p.charAt(p + 1)); + case sL_ESC: return match_class(c, ms.p.charAt(p + 1)); case '[': return matchbracketclass(ms, c, p, ep - 1); default: return ms.p.charAt(p) === c; } @@ -962,6 +977,7 @@ const min_expand = function(ms, s, p, ep) { const start_capture = function(ms, s, p, what) { let level = ms.level; if (level >= LUA_MAXCAPTURES) lauxlib.luaL_error(ms.L, "too many captures"); + ms.capture[level] = ms.capture[level] ? ms.capture[level] : {}; ms.capture[level].init = s; ms.capture[level].len = what; ms.level = level + 1; @@ -1001,13 +1017,13 @@ const match = function(ms, s, p) { switch (gotodefault ? 'x' : ms.p.charAt(p)) { case '(': { /* start capture */ if (ms.p.charAt(p + 1) === ')') /* position capture? */ - s = start_capture(ms, s, 2, CAP_POSITION); + s = start_capture(ms, s, p + 2, CAP_POSITION); else - s = start_capture(ms, s, 1, CAP_UNFINISHED); + s = start_capture(ms, s, p + 1, CAP_UNFINISHED); break; } case ')': { /* end capture */ - s = end_capture(ms, s, 1); + s = end_capture(ms, s, p + 1); break; } case '$': { @@ -1018,7 +1034,7 @@ const match = function(ms, s, p) { s = ms.src.slice(s).length === 0 ? s : null; /* check end of string */ break; } - case L_ESC: { /* escaped sequences not in the format class[*+?-]? */ + case sL_ESC: { /* escaped sequences not in the format class[*+?-]? */ switch (ms.p.charAt(p + 1)) { case 'b': { /* balanced string? */ s = matchbalance(ms, s, p + 2); @@ -1058,7 +1074,7 @@ const match = function(ms, s, p) { let ep = classend(ms, p); /* points to optional suffix */ /* does not match at least once? */ if (!singlematch(ms, s, p, ep)) { - if (ep.charAt(0) === '*' || ep.charAt(0) === '?' || ep.charAt(0) === '-') { /* accept empty? */ + if (ms.p.charAt(ep) === '*' || ms.p.charAt(ep) === '?' || ms.p.charAt(ep) === '-') { /* accept empty? */ p = ep + 1; gotoinit = true; break; } else /* '+' or no suffix */ s = null; /* fail */ @@ -1094,7 +1110,7 @@ const match = function(ms, s, p) { return s; }; -const push_onecatpure = function(ms, i, s, e) { +const push_onecapture = function(ms, i, s, e) { if (i >= ms.level) { if (i === 0) lapi.lua_pushlstring(ms.L, s, e); /* add whole match */ @@ -1106,7 +1122,7 @@ const push_onecatpure = function(ms, i, s, e) { if (l === CAP_POSITION) lapi.lua_pushinteger(ms.L, ms.src_init + 1); else - lapi.lua_pushlstring(ms.L, ms.capture[i].init, l); + lapi.lua_pushlstring(ms.L, ms.src.slice(ms.capture[i].init), l); } }; @@ -1114,7 +1130,7 @@ const push_captures = function(ms, s, e) { let nlevels = ms.level === 0 && s ? 1 : ms.level; lauxlib.luaL_checkstack(ms.L, nlevels, "too many catpures"); for (let i = 0; i < nlevels; i++) - push_onecatpure(ms, i, s, e); + push_onecapture(ms, i, s, e); return nlevels; /* number of strings pushed */ }; @@ -1168,7 +1184,7 @@ const str_find_aux = function(L, find) { /* do a plain search */ let f = s.indexOf(p); if (f > -1) { - lapi.lua_pushinteger(L, f); + lapi.lua_pushinteger(L, f + 1); lapi.lua_pushinteger(L, f + lp); return 2; } @@ -1185,7 +1201,7 @@ const str_find_aux = function(L, find) { reprepstate(ms); if ((res = match(ms, s1, 0)) !== null) { if (find) { - lapi.lua_pushinteger(L, s1); /* start */ + lapi.lua_pushinteger(L, s1 + 1); /* start */ lapi.lua_pushinteger(L, res); /* end */ return push_captures(ms, null, 0) + 2; } else @@ -1193,6 +1209,8 @@ const str_find_aux = function(L, find) { } } while (s1++ < ms.src_end && !anchor); } + lapi.lua_pushnil(L); /* not found */ + return 1; }; const str_find = function(L) { @@ -1200,7 +1218,7 @@ const str_find = function(L) { }; const str_match = function(L) { - return str_find_aux(L, 1); + return str_find_aux(L, 0); }; const strlib = { |