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116 lines
4.1 KiB
C++
116 lines
4.1 KiB
C++
// minilex.h
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// mini js lexical analyzer. idea is to be dumb and fast.
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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namespace mongo {
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struct MiniLex {
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strhashmap reserved;
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bool ic[256]; // ic=Identifier Character
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bool starter[256];
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// dm: very dumb about comments and escaped quotes -- but we are faster then at least,
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// albeit returning too much (which is ok for jsbobj current usage).
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void grabVariables(char *code /*modified and must stay in scope*/, strhashmap& vars) {
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char *p = code;
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char last = 0;
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while ( *p ) {
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if ( starter[*p] ) {
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char *q = p+1;
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while ( *q && ic[*q] ) q++;
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const char *identifier = p;
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bool done = *q == 0;
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*q = 0;
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if ( !reserved.count(identifier) ) {
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// we try to be smart about 'obj' but have to be careful as obj.obj
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// can happen; this is so that nFields is right for simplistic where cases
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// so we can stop scanning in jsobj when we find the field of interest.
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if ( strcmp(identifier,"obj")==0 && p>code && p[-1] != '.' )
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;
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else
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vars[identifier] = 1;
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}
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if ( done )
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break;
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p = q + 1;
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continue;
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}
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if ( *p == '\'' ) {
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p++;
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while ( *p && *p != '\'' ) p++;
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}
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else if ( *p == '"' ) {
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p++;
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while ( *p && *p != '"' ) p++;
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}
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p++;
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}
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}
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MiniLex() {
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strhashmap atest;
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atest["foo"] = 3;
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assert( atest.count("bar") == 0 );
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assert( atest.count("foo") == 1 );
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assert( atest["foo"] == 3 );
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for ( int i = 0; i < 256; i++ ) {
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ic[i] = starter[i] = false;
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}
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for ( int i = 'a'; i <= 'z'; i++ )
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ic[i] = starter[i] = true;
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for ( int i = 'A'; i <= 'Z'; i++ )
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ic[i] = starter[i] = true;
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for ( int i = '0'; i <= '9'; i++ )
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ic[i] = true;
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for ( int i = 128; i < 256; i++ )
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ic[i] = starter[i] = true;
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ic['$'] = starter['$'] = true;
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ic['_'] = starter['_'] = true;
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reserved["break"] = true;
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reserved["case"] = true;
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reserved["catch"] = true;
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reserved["continue"] = true;
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reserved["default"] = true;
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reserved["delete"] = true;
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reserved["do"] = true;
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reserved["else"] = true;
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reserved["finally"] = true;
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reserved["for"] = true;
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reserved["function"] = true;
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reserved["if"] = true;
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reserved["in"] = true;
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reserved["instanceof"] = true;
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reserved["new"] = true;
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reserved["return"] = true;
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reserved["switch"] = true;
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reserved["this"] = true;
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reserved["throw"] = true;
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reserved["try"] = true;
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reserved["typeof"] = true;
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reserved["var"] = true;
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reserved["void"] = true;
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reserved["while"] = true;
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reserved["with "] = true;
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}
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};
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} // namespace mongo
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