447 lines
11 KiB
C++
447 lines
11 KiB
C++
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/*
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see copyright notice in squirrel.h
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*/
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#include "sqpcheader.h"
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#include <ctype.h>
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#include <stdlib.h>
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#include "sqtable.h"
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#include "sqstring.h"
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#include "sqcompiler.h"
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#include "sqlexer.h"
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#define CUR_CHAR (_currdata)
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#define RETURN_TOKEN(t) { _prevtoken = _curtoken; _curtoken = t; return t;}
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#define IS_EOB() (CUR_CHAR <= SQUIRREL_EOB)
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#define NEXT() {Next();_currentcolumn++;}
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#define INIT_TEMP_STRING() { _longstr.resize(0);}
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#define APPEND_CHAR(c) { _longstr.push_back(c);}
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#define TERMINATE_BUFFER() {_longstr.push_back(_SC('\0'));}
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#define ADD_KEYWORD(key,id) _keywords->NewSlot( SQString::Create(ss, _SC(#key)) ,SQInteger(id))
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SQLexer::SQLexer(){}
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SQLexer::~SQLexer()
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{
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_keywords->Release();
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}
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void SQLexer::Init(SQSharedState *ss, SQLEXREADFUNC rg, SQUserPointer up,CompilerErrorFunc efunc,void *ed)
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{
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_errfunc = efunc;
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_errtarget = ed;
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_sharedstate = ss;
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_keywords = SQTable::Create(ss, 26);
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ADD_KEYWORD(while, TK_WHILE);
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ADD_KEYWORD(do, TK_DO);
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ADD_KEYWORD(if, TK_IF);
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ADD_KEYWORD(else, TK_ELSE);
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ADD_KEYWORD(break, TK_BREAK);
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ADD_KEYWORD(continue, TK_CONTINUE);
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ADD_KEYWORD(return, TK_RETURN);
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ADD_KEYWORD(null, TK_NULL);
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ADD_KEYWORD(function, TK_FUNCTION);
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ADD_KEYWORD(local, TK_LOCAL);
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ADD_KEYWORD(for, TK_FOR);
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ADD_KEYWORD(foreach, TK_FOREACH);
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ADD_KEYWORD(in, TK_IN);
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ADD_KEYWORD(typeof, TK_TYPEOF);
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ADD_KEYWORD(delegate, TK_DELEGATE);
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ADD_KEYWORD(delete, TK_DELETE);
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ADD_KEYWORD(try, TK_TRY);
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ADD_KEYWORD(catch, TK_CATCH);
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ADD_KEYWORD(throw, TK_THROW);
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ADD_KEYWORD(clone, TK_CLONE);
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ADD_KEYWORD(yield, TK_YIELD);
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ADD_KEYWORD(resume, TK_RESUME);
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ADD_KEYWORD(switch, TK_SWITCH);
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ADD_KEYWORD(case, TK_CASE);
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ADD_KEYWORD(default, TK_DEFAULT);
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ADD_KEYWORD(this, TK_THIS);
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ADD_KEYWORD(parent,TK_PARENT);
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ADD_KEYWORD(class,TK_CLASS);
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ADD_KEYWORD(extends,TK_EXTENDS);
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ADD_KEYWORD(constructor,TK_CONSTRUCTOR);
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ADD_KEYWORD(instanceof,TK_INSTANCEOF);
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ADD_KEYWORD(vargc,TK_VARGC);
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ADD_KEYWORD(vargv,TK_VARGV);
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ADD_KEYWORD(true,TK_TRUE);
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ADD_KEYWORD(false,TK_FALSE);
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ADD_KEYWORD(static,TK_STATIC);
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_readf = rg;
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_up = up;
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_lasttokenline = _currentline = 1;
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_currentcolumn = 0;
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_prevtoken = -1;
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Next();
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}
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void SQLexer::Error(const SQChar *err)
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{
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_errfunc(_errtarget,err);
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}
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void SQLexer::Next()
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{
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SQInteger t = _readf(_up);
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if(t > MAX_CHAR) Error(_SC("Invalid character"));
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if(t != 0) {
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_currdata = (LexChar)t;
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return;
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}
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_currdata = SQUIRREL_EOB;
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}
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const SQChar *SQLexer::Tok2Str(SQInteger tok)
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{
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SQObjectPtr itr, key, val;
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SQInteger nitr;
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while((nitr = _keywords->Next(false,itr, key, val)) != -1) {
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itr = (SQInteger)nitr;
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if(((SQInteger)_integer(val)) == tok)
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return _stringval(key);
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}
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return NULL;
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}
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void SQLexer::LexBlockComment()
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{
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bool done = false;
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while(!done) {
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switch(CUR_CHAR) {
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case _SC('*'): { NEXT(); if(CUR_CHAR == _SC('/')) { done = true; NEXT(); }}; continue;
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case _SC('\n'): _currentline++; NEXT(); continue;
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case SQUIRREL_EOB: Error(_SC("missing \"*/\" in comment"));
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default: NEXT();
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}
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}
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}
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SQInteger SQLexer::Lex()
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{
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_lasttokenline = _currentline;
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while(CUR_CHAR != SQUIRREL_EOB) {
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switch(CUR_CHAR){
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case _SC('\t'): case _SC('\r'): case _SC(' '): NEXT(); continue;
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case _SC('\n'):
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_currentline++;
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_prevtoken=_curtoken;
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_curtoken=_SC('\n');
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NEXT();
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_currentcolumn=1;
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continue;
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case _SC('/'):
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NEXT();
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switch(CUR_CHAR){
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case _SC('*'):
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NEXT();
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LexBlockComment();
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continue;
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case _SC('/'):
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do { NEXT(); } while (CUR_CHAR != _SC('\n') && (!IS_EOB()));
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continue;
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case _SC('='):
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NEXT();
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RETURN_TOKEN(TK_DIVEQ);
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continue;
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case _SC('>'):
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NEXT();
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RETURN_TOKEN(TK_ATTR_CLOSE);
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continue;
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default:
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RETURN_TOKEN('/');
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}
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case _SC('='):
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NEXT();
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if (CUR_CHAR != _SC('=')){ RETURN_TOKEN('=') }
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else { NEXT(); RETURN_TOKEN(TK_EQ); }
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case _SC('<'):
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NEXT();
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if ( CUR_CHAR == _SC('=') ) { NEXT(); RETURN_TOKEN(TK_LE) }
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else if ( CUR_CHAR == _SC('-') ) { NEXT(); RETURN_TOKEN(TK_NEWSLOT); }
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else if ( CUR_CHAR == _SC('<') ) { NEXT(); RETURN_TOKEN(TK_SHIFTL); }
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else if ( CUR_CHAR == _SC('/') ) { NEXT(); RETURN_TOKEN(TK_ATTR_OPEN); }
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//else if ( CUR_CHAR == _SC('[') ) { NEXT(); ReadMultilineString(); RETURN_TOKEN(TK_STRING_LITERAL); }
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else { RETURN_TOKEN('<') }
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case _SC('>'):
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NEXT();
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if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_GE);}
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else if(CUR_CHAR == _SC('>')){
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NEXT();
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if(CUR_CHAR == _SC('>')){
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NEXT();
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RETURN_TOKEN(TK_USHIFTR);
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}
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RETURN_TOKEN(TK_SHIFTR);
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}
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else { RETURN_TOKEN('>') }
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case _SC('!'):
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NEXT();
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if (CUR_CHAR != _SC('=')){ RETURN_TOKEN('!')}
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else { NEXT(); RETURN_TOKEN(TK_NE); }
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case _SC('@'): {
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SQInteger stype;
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NEXT();
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if(CUR_CHAR != _SC('"'))
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Error(_SC("string expected"));
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if((stype=ReadString('"',true))!=-1) {
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RETURN_TOKEN(stype);
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}
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Error(_SC("error parsing the string"));
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}
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case _SC('"'):
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case _SC('\''): {
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SQInteger stype;
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if((stype=ReadString(CUR_CHAR,false))!=-1){
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RETURN_TOKEN(stype);
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}
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Error(_SC("error parsing the string"));
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}
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case _SC('{'): case _SC('}'): case _SC('('): case _SC(')'): case _SC('['): case _SC(']'):
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case _SC(';'): case _SC(','): case _SC('?'): case _SC('^'): case _SC('~'):
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{SQInteger ret = CUR_CHAR;
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NEXT(); RETURN_TOKEN(ret); }
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case _SC('.'):
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NEXT();
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if (CUR_CHAR != _SC('.')){ RETURN_TOKEN('.') }
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NEXT();
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if (CUR_CHAR != _SC('.')){ Error(_SC("invalid token '..'")); }
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NEXT();
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RETURN_TOKEN(TK_VARPARAMS);
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case _SC('&'):
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NEXT();
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if (CUR_CHAR != _SC('&')){ RETURN_TOKEN('&') }
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else { NEXT(); RETURN_TOKEN(TK_AND); }
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case _SC('|'):
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NEXT();
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if (CUR_CHAR != _SC('|')){ RETURN_TOKEN('|') }
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else { NEXT(); RETURN_TOKEN(TK_OR); }
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case _SC(':'):
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NEXT();
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if (CUR_CHAR != _SC(':')){ RETURN_TOKEN(':') }
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else { NEXT(); RETURN_TOKEN(TK_DOUBLE_COLON); }
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case _SC('*'):
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NEXT();
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if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_MULEQ);}
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else RETURN_TOKEN('*');
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case _SC('%'):
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NEXT();
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if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_MODEQ);}
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else RETURN_TOKEN('%');
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case _SC('-'):
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NEXT();
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if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_MINUSEQ);}
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else if (CUR_CHAR == _SC('-')){ NEXT(); RETURN_TOKEN(TK_MINUSMINUS);}
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else RETURN_TOKEN('-');
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case _SC('+'):
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NEXT();
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if (CUR_CHAR == _SC('=')){ NEXT(); RETURN_TOKEN(TK_PLUSEQ);}
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else if (CUR_CHAR == _SC('+')){ NEXT(); RETURN_TOKEN(TK_PLUSPLUS);}
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else RETURN_TOKEN('+');
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case SQUIRREL_EOB:
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return 0;
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default:{
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if (scisdigit(CUR_CHAR)) {
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SQInteger ret = ReadNumber();
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RETURN_TOKEN(ret);
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}
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else if (scisalpha(CUR_CHAR) || CUR_CHAR == _SC('_')) {
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SQInteger t = ReadID();
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RETURN_TOKEN(t);
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}
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else {
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SQInteger c = CUR_CHAR;
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if (sciscntrl((int)c)) Error(_SC("unexpected character(control)"));
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NEXT();
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RETURN_TOKEN(c);
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}
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RETURN_TOKEN(0);
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}
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}
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}
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return 0;
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}
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SQInteger SQLexer::GetIDType(SQChar *s)
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{
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SQObjectPtr t;
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if(_keywords->Get(SQString::Create(_sharedstate, s), t)) {
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return SQInteger(_integer(t));
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}
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return TK_IDENTIFIER;
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}
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SQInteger SQLexer::ReadString(SQInteger ndelim,bool verbatim)
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{
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INIT_TEMP_STRING();
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NEXT();
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if(IS_EOB()) return -1;
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for(;;) {
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while(CUR_CHAR != ndelim) {
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switch(CUR_CHAR) {
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case SQUIRREL_EOB:
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Error(_SC("unfinished string"));
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return -1;
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case _SC('\n'):
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if(!verbatim) Error(_SC("newline in a constant"));
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APPEND_CHAR(CUR_CHAR); NEXT();
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_currentline++;
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break;
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case _SC('\\'):
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if(verbatim) {
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APPEND_CHAR('\\'); NEXT();
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}
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else {
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NEXT();
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switch(CUR_CHAR) {
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case _SC('x'): NEXT(); {
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if(!isxdigit(CUR_CHAR)) Error(_SC("hexadecimal number expected"));
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const SQInteger maxdigits = 4;
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SQChar temp[maxdigits+1];
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SQInteger n = 0;
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while(isxdigit(CUR_CHAR) && n < maxdigits) {
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temp[n] = CUR_CHAR;
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n++;
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NEXT();
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}
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temp[n] = 0;
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SQChar *sTemp;
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APPEND_CHAR((SQChar)scstrtoul(temp,&sTemp,16));
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}
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break;
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case _SC('t'): APPEND_CHAR(_SC('\t')); NEXT(); break;
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case _SC('a'): APPEND_CHAR(_SC('\a')); NEXT(); break;
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case _SC('b'): APPEND_CHAR(_SC('\b')); NEXT(); break;
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case _SC('n'): APPEND_CHAR(_SC('\n')); NEXT(); break;
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case _SC('r'): APPEND_CHAR(_SC('\r')); NEXT(); break;
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case _SC('v'): APPEND_CHAR(_SC('\v')); NEXT(); break;
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case _SC('f'): APPEND_CHAR(_SC('\f')); NEXT(); break;
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case _SC('0'): APPEND_CHAR(_SC('\0')); NEXT(); break;
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case _SC('\\'): APPEND_CHAR(_SC('\\')); NEXT(); break;
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case _SC('"'): APPEND_CHAR(_SC('"')); NEXT(); break;
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case _SC('\''): APPEND_CHAR(_SC('\'')); NEXT(); break;
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default:
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Error(_SC("unrecognised escaper char"));
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break;
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}
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}
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break;
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default:
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APPEND_CHAR(CUR_CHAR);
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NEXT();
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}
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}
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NEXT();
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if(verbatim && CUR_CHAR == '"') { //double quotation
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APPEND_CHAR(CUR_CHAR);
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NEXT();
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}
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else {
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break;
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}
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}
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TERMINATE_BUFFER();
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SQInteger len = _longstr.size()-1;
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if(ndelim == _SC('\'')) {
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if(len == 0) Error(_SC("empty constant"));
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if(len > 1) Error(_SC("constant too long"));
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_nvalue = _longstr[0];
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return TK_INTEGER;
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}
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_svalue = &_longstr[0];
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return TK_STRING_LITERAL;
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}
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void LexHexadecimal(const SQChar *s,SQUnsignedInteger *res)
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{
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*res = 0;
|
||
|
|
while(*s != 0)
|
||
|
|
{
|
||
|
|
if(scisdigit(*s)) *res = (*res)*16+((*s++)-'0');
|
||
|
|
else if(scisxdigit(*s)) *res = (*res)*16+(toupper(*s++)-'A'+10);
|
||
|
|
else { assert(0); }
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void LexInteger(const SQChar *s,SQUnsignedInteger *res)
|
||
|
|
{
|
||
|
|
*res = 0;
|
||
|
|
while(*s != 0)
|
||
|
|
{
|
||
|
|
*res = (*res)*10+((*s++)-'0');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
SQInteger isexponent(SQInteger c) { return c == 'e' || c=='E'; }
|
||
|
|
#define MAX_HEX_DIGITS (sizeof(SQInteger)*2)
|
||
|
|
SQInteger SQLexer::ReadNumber()
|
||
|
|
{
|
||
|
|
#define TINT 1
|
||
|
|
#define TFLOAT 2
|
||
|
|
#define THEX 3
|
||
|
|
#define TSCIENTIFIC 4
|
||
|
|
SQInteger type = TINT, firstchar = CUR_CHAR;
|
||
|
|
SQChar *sTemp;
|
||
|
|
INIT_TEMP_STRING();
|
||
|
|
NEXT();
|
||
|
|
if(firstchar == _SC('0') && toupper(CUR_CHAR) == _SC('X')) {
|
||
|
|
NEXT();
|
||
|
|
type = THEX;
|
||
|
|
while(isxdigit(CUR_CHAR)) {
|
||
|
|
APPEND_CHAR(CUR_CHAR);
|
||
|
|
NEXT();
|
||
|
|
}
|
||
|
|
if(_longstr.size() > MAX_HEX_DIGITS) Error(_SC("too many digits for an Hex number"));
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
APPEND_CHAR((int)firstchar);
|
||
|
|
while (CUR_CHAR == _SC('.') || scisdigit(CUR_CHAR) || isexponent(CUR_CHAR)) {
|
||
|
|
if(CUR_CHAR == _SC('.')) type = TFLOAT;
|
||
|
|
if(isexponent(CUR_CHAR)) {
|
||
|
|
if(type != TFLOAT) Error(_SC("invalid numeric format"));
|
||
|
|
type = TSCIENTIFIC;
|
||
|
|
APPEND_CHAR(CUR_CHAR);
|
||
|
|
NEXT();
|
||
|
|
if(CUR_CHAR == '+' || CUR_CHAR == '-'){
|
||
|
|
APPEND_CHAR(CUR_CHAR);
|
||
|
|
NEXT();
|
||
|
|
}
|
||
|
|
if(!scisdigit(CUR_CHAR)) Error(_SC("exponent expected"));
|
||
|
|
}
|
||
|
|
|
||
|
|
APPEND_CHAR(CUR_CHAR);
|
||
|
|
NEXT();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
TERMINATE_BUFFER();
|
||
|
|
switch(type) {
|
||
|
|
case TSCIENTIFIC:
|
||
|
|
case TFLOAT:
|
||
|
|
_fvalue = (SQFloat)scstrtod(&_longstr[0],&sTemp);
|
||
|
|
return TK_FLOAT;
|
||
|
|
case TINT:
|
||
|
|
LexInteger(&_longstr[0],(SQUnsignedInteger *)&_nvalue);
|
||
|
|
return TK_INTEGER;
|
||
|
|
case THEX:
|
||
|
|
LexHexadecimal(&_longstr[0],(SQUnsignedInteger *)&_nvalue);
|
||
|
|
return TK_INTEGER;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
SQInteger SQLexer::ReadID()
|
||
|
|
{
|
||
|
|
SQInteger res;
|
||
|
|
INIT_TEMP_STRING();
|
||
|
|
do {
|
||
|
|
APPEND_CHAR(CUR_CHAR);
|
||
|
|
NEXT();
|
||
|
|
} while(scisalnum(CUR_CHAR) || CUR_CHAR == _SC('_'));
|
||
|
|
TERMINATE_BUFFER();
|
||
|
|
res = GetIDType(&_longstr[0]);
|
||
|
|
if(res == TK_IDENTIFIER || res == TK_CONSTRUCTOR) {
|
||
|
|
_svalue = &_longstr[0];
|
||
|
|
}
|
||
|
|
return res;
|
||
|
|
}
|