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ExpressionParser.cpp
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ExpressionParser.cpp
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/*
* Copyright 2019 Rochus Keller <mailto:[email protected]>
*
* This file is part of the JuaJIT BC Viewer application.
*
* The following is the license that applies to this copy of the
* application. For a license to use the application under conditions
* other than those described here, please email to [email protected].
*
* GNU General Public License Usage
* This file may be used under the terms of the GNU General Public
* License (GPL) versions 2.0 or 3.0 as published by the Free Software
* Foundation and appearing in the file LICENSE.GPL included in
* the packaging of this file. Please review the following information
* to ensure GNU General Public Licensing requirements will be met:
* http://www.fsf.org/licensing/licenses/info/GPLv2.html and
* http://www.gnu.org/copyleft/gpl.html.
*/
// Fragmente aus lparser.c mit folgender Lizenz
/*
** $Id: lparser.c,v 2.42.1.4 2011/10/21 19:31:42 roberto Exp $
** Lua Parser
** See Copyright Notice in lua.h
*/
#include "ExpressionParser.h"
#include <lua.hpp>
#include "Engine2.h"
#include <QtDebug>
#include <ctype.h>
#include <math.h>
using namespace Lua;
ExpressionParser::ExpressionParser():d_top(0)
{
}
ExpressionParser::~ExpressionParser()
{
if( d_top )
delete d_top;
}
bool Lua::ExpressionParser::parse(const QByteArray & str)
{
// http://www.lua.org/manual/5.1/manual.html Subset
// exp ::= nil | false | true | Number | String | prefixexp | exp binop exp | unop exp
// prefixexp ::= var | '(' exp ')'
// var ::= Name | prefixexp '[' exp ']' | prefixexp '.' Name
// binop ::= '+' | '-' | '*' | '/' | '^' | '%' | '..' | '<' | '<=' | '>' | '>=' | '==' | '~=' | and | or
// unop ::= '-' | not | '#'
// Leider ist die Syntax mehrdeutig; Lösungen siehe http://www.engr.mun.ca/~theo/Misc/exp_parsing.htm
// Siehe auch http://lua-users.org/lists/lua-l/2011-10/msg00438.html
if( d_top )
delete d_top;
if( str.isEmpty() )
{
d_top = new AstNode();
return true;
}
if( !d_lex.process( str ) )
{
d_error = d_lex.getError();
return false;
}
try
{
d_lex.next();
AstNode tmp;
expr( &tmp );
d_top = tmp.d_left;
tmp.d_left = 0;
}catch( const ParsEx& )
{
return false;
}
return true;
}
bool ExpressionParser::parseAndPrint(const QByteArray & source, Engine2 *e, bool doDump )
{
Q_ASSERT( e != 0 );
if( parse( source ) )
{
if( doDump )
{
Q_ASSERT( getTop() != 0 );
QByteArray str;
QTextStream out( &str );
dump( out );
e->print(str);
}
return true;
}else
{
if( !getError().isEmpty() )
e->error( getError().toLatin1() );
else
e->error( "unknown expression parser error");
return false;
}
}
int ExpressionParser::execute(Engine2 * e)
{
Q_ASSERT( e != 0 );
d_error.clear();
if( d_top == 0 )
return 0;
try
{
if( d_top->d_type == Invalid )
{
lua_pushnil(e->getCtx());
return 1;
}
if( d_top->d_type == Name )
{
e->pushLocalOrGlobal( d_top->d_val.toByteArray() );
return 1;
}else
return depthFirstExec( e, d_top );
}catch( const ParsEx& )
{
return 0;
}
}
bool ExpressionParser::executeAndPrint(Engine2 * e)
{
if( execute( e ) > 0 )
{
switch( lua_type( e->getCtx(), -1 ) )
{
case LUA_TNIL:
case LUA_TNUMBER:
case LUA_TBOOLEAN:
case LUA_TSTRING:
e->print( e->getValueString(-1) );
break;
default:
e->print( e->getTypeName( -1 ) + ": " + e->getValueString(-1) );
break;
}
e->pop();
return true;
}else
{
if( !getError().isEmpty() )
e->error( getError().toLatin1() );
else
e->error( "unknown execution error");
return false;
}
}
void ExpressionParser::dump(QTextStream &out) const
{
d_lex.dump( out );
if( d_top )
d_top->dump(out);
else
out << "No top node" << endl;
}
void ExpressionParser::error(const char *msg)
{
d_error = msg;
throw ParsEx();
}
static inline void _evalName( Engine2* e, ExpressionParser::AstNode* n, int arg )
{
Q_ASSERT( n != 0 );
if( n->d_type == ExpressionParser::Name )
{
const QByteArray name = lua_tostring( e->getCtx(), arg );
e->pushLocalOrGlobal( name );
// _printStack( e, 4, "in evalName" );
lua_replace( e->getCtx(), (arg<0)?(arg - 1):arg );
}
}
#define luai_nummod(a,b) ((a) - floor((a)/(b))*(b))
static bool _compareSimpleOrUser(Engine2* e, int op )
{
switch( lua_type( e->getCtx(), -2 ) )
{
case LUA_TNIL:
case LUA_TNUMBER:
case LUA_TBOOLEAN:
case LUA_TSTRING:
case LUA_TLIGHTUSERDATA:
case LUA_TUSERDATA:
switch(op)
{
case ExpressionLexer::Neq:
lua_pushboolean( e->getCtx(), !lua_equal( e->getCtx(), -2, -1 ) );
break;
case ExpressionLexer::Eq:
lua_pushboolean( e->getCtx(), lua_equal( e->getCtx(), -2, -1 ) );
break;
case ExpressionLexer::Lt:
lua_pushboolean( e->getCtx(), lua_lessthan( e->getCtx(), -2, -1 ) );
break;
case ExpressionLexer::Leq:
lua_pushboolean( e->getCtx(), lua_lessthan( e->getCtx(), -2, -1 ) || lua_equal( e->getCtx(), -2, -1 ) );
break;
case ExpressionLexer::Gt:
lua_pushboolean( e->getCtx(), !lua_lessthan( e->getCtx(), -2, -1 ) && !lua_equal( e->getCtx(), -2, -1 ) );
break;
case ExpressionLexer::Geq:
lua_pushboolean( e->getCtx(), !lua_lessthan( e->getCtx(), -2, -1 ) || lua_equal( e->getCtx(), -2, -1 ) );
break;
default:
return false;
}
return true;
default:
break;
}
return false;
}
int ExpressionParser::depthFirstExec(Engine2* e, ExpressionParser::AstNode * n)
{
if( n == 0 )
return 0;
if( n->d_left )
depthFirstExec( e, n->d_left );
if( n->d_right )
depthFirstExec( e, n->d_right );
switch( n->d_type )
{
case Constant:
switch( n->d_val.type() )
{
case QVariant::Invalid:
lua_pushnil( e->getCtx() );
return 1;
case QVariant::Bool:
lua_pushboolean( e->getCtx(), n->d_val.toBool() );
return 1;
case QVariant::Double:
lua_pushnumber( e->getCtx(), n->d_val.toDouble());
return 1;
default:
lua_pushstring( e->getCtx(), n->d_val.toString().toLatin1() );
return 1;
}
break;
case BinOp:
_evalName( e, n->d_left, -2 );
_evalName( e, n->d_right, -1 );
switch( n->d_val.toInt() )
{
case ExpressionLexer::Plus:
lua_pushnumber( e->getCtx(), lua_tonumber( e->getCtx(), -2 ) + lua_tonumber( e->getCtx(), -1 ) );
break;
case ExpressionLexer::Minus:
lua_pushnumber( e->getCtx(), lua_tonumber( e->getCtx(), -2 ) - lua_tonumber( e->getCtx(), -1 ) );
break;
case ExpressionLexer::Star:
lua_pushnumber( e->getCtx(), lua_tonumber( e->getCtx(), -2 ) * lua_tonumber( e->getCtx(), -1 ) );
break;
case ExpressionLexer::Slash:
lua_pushnumber( e->getCtx(), lua_tonumber( e->getCtx(), -2 ) / lua_tonumber( e->getCtx(), -1 ) );
break;
case ExpressionLexer::Percent:
lua_pushnumber( e->getCtx(), luai_nummod( lua_tonumber( e->getCtx(), -2 ),
lua_tonumber( e->getCtx(), -1 ) ) );
break;
case ExpressionLexer::Hat:
lua_pushnumber( e->getCtx(), ::pow( lua_tonumber( e->getCtx(), -2 ),
lua_tonumber( e->getCtx(), -1 ) ) );
break;
case ExpressionLexer::Concat:
lua_pushstring( e->getCtx(), QByteArray( lua_tostring( e->getCtx(), -2 ) +
QByteArray( lua_tostring( e->getCtx(), -1 ) ) ) );
break;
case ExpressionLexer::Neq:
case ExpressionLexer::Eq:
case ExpressionLexer::Lt:
case ExpressionLexer::Leq:
case ExpressionLexer::Gt:
case ExpressionLexer::Geq:
if( !_compareSimpleOrUser( e, n->d_val.toInt() ) )
{
lua_pop( e->getCtx(), 2 );
error("binary operation not supported for operands");
}
break;
case ExpressionLexer::And:
lua_pushboolean( e->getCtx(), lua_toboolean( e->getCtx(), -2 ) && lua_toboolean( e->getCtx(), -1 ) );
break;
case ExpressionLexer::Or:
lua_pushboolean( e->getCtx(), lua_toboolean( e->getCtx(), -2 ) || lua_toboolean( e->getCtx(), -1 ) );
break;
default:
lua_pop( e->getCtx(), 2 );
error("invalid binary operator");
break;
}
// Stack: val1, val2, res
lua_replace( e->getCtx(), -3 );
// Stack: res, val2
lua_pop( e->getCtx(), 1 );
// Stack: res
return 1;
case UnOp:
_evalName( e, n->d_left, -1 );
switch( n->d_val.toInt() )
{
case ExpressionLexer::Minus:
lua_pushnumber( e->getCtx(), -lua_tonumber( e->getCtx(), -1 ) );
lua_replace( e->getCtx(), -2 );
return 1;
case ExpressionLexer::Not:
lua_pushboolean( e->getCtx(), !lua_toboolean( e->getCtx(), -1 ) );
lua_replace( e->getCtx(), -2 );
return 1;
case ExpressionLexer::Pound:
switch( lua_type( e->getCtx(), -1 ) )
{
case LUA_TTABLE:
case LUA_TSTRING:
lua_pushnumber( e->getCtx(), lua_objlen( e->getCtx(), -1 ) );
lua_replace( e->getCtx(), -2 );
return 1;
default:
lua_pop( e->getCtx(), 1 );
error("invalid operand for # operator");
break;
}
break;
default:
lua_pop( e->getCtx(), 1 );
error("invalid unary operator");
break;
}
break;
case DotOp:
case IndexOp:
// Start einer Kette der Form a.b.c; nur der unterste Node (hier a) hat links einen Name
//_printStack( e, 4, "before evalName" );
_evalName( e, n->d_left, -2 );
//_printStack( e, 4, "after evalName" );
if( lua_isuserdata( e->getCtx(), -2 ) )
lua_gettable( e->getCtx(), -2 ); // Zugriff mit Metamethoden
else if( lua_istable( e->getCtx(), -2 ) )
{
lua_rawget( e->getCtx(), -2 );
}else
{
lua_pop(e->getCtx(), 2);
error( "invalid left operand in index operation");
}
// Stack: user|table, val
lua_remove( e->getCtx(), -2 );
// Stack: val
return 1;
case Name:
lua_pushstring( e->getCtx(), n->d_val.toByteArray() );
return 1;
default:
break;
}
return 0;
}
ExpressionLexer::Operator ExpressionLexer::fetchOp()
{
char ch;
char ch2[3];
d_source.peek( &ch, 1 );
switch( ch )
{
case '+':
d_source.eat();
return Plus;
case '-':
d_source.eat();
return Minus;
case '*':
d_source.eat();
return Star;
case '/':
d_source.eat();
return Slash;
case '^':
d_source.eat();
return Hat;
case '%':
d_source.eat();
return Percent;
case '<': // '<' | '<='
d_source.peek( ch2, 1 );
if( ch2[0] == '=' )
{
d_source.eat();
return Leq;
}else
{
d_source.eat(1);
return Lt;
}
case '>':
d_source.peek( ch2, 1 );
if( ch2[0] == '=' )
{
d_source.eat();
return Geq;
}else
{
d_source.eat(1);
return Gt;
}
case '.':
d_source.peek( ch2, 1 );
if( ch2[0] == '.' )
{
d_source.eat();
return Concat;
}
break;
case '=':
d_source.peek( ch2, 1 );
if( ch2[0] == '=' )
{
d_source.eat();
return Eq;
}
break;
case '~':
d_source.peek( ch2, 1 );
if( ch2[0] == '=' )
{
d_source.eat();
return Neq;
}
break;
case '#':
d_source.eat();
return Pound;
case 'a':
d_source.peek( ch2, 2 );
if( ch2[0] == 'n' && ch2[1] == 'd' )
{
d_source.eat();
return And;
}
break;
case 'o':
d_source.peek( ch2, 1 );
if( ch2[0] == 'r' )
{
d_source.eat();
return Or;
}
break;
case 'n':
d_source.peek( ch2, 2 );
if( ch2[0] == 'o' && ch2[1] == 't' )
{
d_source.eat();
return Not;
}
break;
}
d_source.rewind();
return NoOp;
}
bool ExpressionLexer::error(const char *msg)
{
d_source.rewind();
d_error = msg;
throw LexEx();
return false;
}
ExpressionLexer::Token ExpressionLexer::fetchNext()
{
QByteArray str;
double number;
char ch;
if( d_source.atEnd() )
return Token();
eatSpace();
if( fetchString( str ) ) // | String
return Token( Token::String, str );
if( fetchNumber( number ) ) // | Number
return Token( Token::Number, number );
if( fetchName( str) ) // | nil | false | true
{
if( str == "nil" )
return Token( Token::Nil );
else if( str == "false" )
return Token( Token::Bool, false );
else if( str == "true" )
return Token( Token::Bool, true );
else
return Token( Token::Name, str );
}
Operator op = fetchOp();
if( op != NoOp ) // exp binop exp
return Token( Token::Op, op );
d_source.peek( &ch, 1 );
switch( ch )
{
case '(':
d_source.eat();
return Token( Token::LBrace );
case ')':
d_source.eat();
return Token( Token::RBrace );
case '[':
d_source.eat();
return Token( Token::LBrack );
case ']':
d_source.eat();
return Token( Token::RBrack );
case '.':
d_source.eat();
return Token( Token::Dot );
}
d_source.rewind();
error( QByteArray("invalid token detected") );
return Token();
}
bool ExpressionLexer::fetchName(QByteArray & out)
{
// any string of letters, digits, and underscores, not beginning with a digit
char ch;
d_source.peek( &ch, 1 );
if( ::isalpha(ch) || ch == '_' )
{
QByteArray name;
while( ::isalpha(ch) || ::isdigit(ch) || ch == '_' )
{
name += ch;
d_source.peek( &ch, 1 );
}
d_source.eat(name.size());
out = name;
return true;
}
d_source.rewind();
return false;
}
bool ExpressionLexer::fetchString( QByteArray &str)
{
char ch;
d_source.peek( &ch, 1 );
QByteArray tmp;
bool escape = false;
if( ch == '"' )
{
d_source.peek( &ch, 1 );
while( escape || ch != '"' )
{
escape = ch == '\\';
tmp += ch;
d_source.peek( &ch, 1 );
}
str = tmp;
d_source.eat();
return true;
}else if( ch == '\'' )
{
d_source.peek( &ch, 1 );
while( escape || ch != '\'' )
{
escape = ch == '\\';
tmp += ch;
d_source.peek( &ch, 1 );
}
str = tmp;
d_source.eat();
return true;
}else if( ch == '[' )
{
d_source.peek( &ch, 1 );
QByteArray endToken = "]";
if( ch == '=' )
{
// Es ist ein Starter der Form [====[
while( ch != 0 && ch != '[' )
{
endToken += "=";
d_source.peek( &ch, 1 );
}
}else if( ch == '[' )
// es ist ein Starter der Form [[
endToken += "]";
else
{
// Es ist kein String
d_source.rewind();
return false;
}
do
{
d_source.peek( &ch, 1 );
tmp += ch;
}while( ch != 0 && !tmp.endsWith( endToken ) );
str = tmp;
str.chop( endToken.size() );
d_source.eat();
return true;
}
d_source.rewind();
return false;
}
static inline bool _isHexChar( char ch )
{
return ( ch >= 'a' && ch <= 'f' ) || ( ch >= 'A' && ch <= 'F' );
}
bool ExpressionLexer::fetchNumber( double &d)
{
char ch;
d_source.peek( &ch, 1 );
QByteArray number;
enum State { Vorkomma, Nachkomma, Exponent2, Exponent1 };
State state = Vorkomma;
// Erstes Zeichen
if( ch == '.' )
{
state = Nachkomma;
}else if( !::isdigit( ch ) )
{
d_source.rewind();
return false;
}
char ch2;
d_source.peek( &ch2, 1 );
if( state == Nachkomma && !::isdigit(ch2) )
{
d_source.rewind();
return false; // wir haben einen Punkt gefunden, der aber nicht von einer Zahl gefolgt wird
}
bool ok;
if( ch2 == 'x' )
{
if( ch != '0')
return error("invalid number format");
// Parse Hex
while( true )
{
d_source.peek( &ch2, 1 );
if( ::isdigit( ch2 ) || _isHexChar( ch2 ) )
number += ch2;
else
{
// Zahl ist fertig
d = number.toUInt( &ok, 16 );
if( !ok )
return error("invalid hex format");
else
{
d_source.eat( number.size() + 2 );
return true;
}
}
}
}else
{
// Parse Decimal
number += ch;
int anzNachkomma = 0;
while( true )
{
switch( state )
{
case Vorkomma:
if( ch2 == '.' )
{
state = Nachkomma;
}else if( ::isdigit( ch2 ) )
;
else if( ch2 == 'e' || ch2 == 'E' )
{
state = Exponent1;
ch2 = 'e';
}else
{
d = number.toUInt( &ok );
if( !ok )
return error("invalid integer");
else
{
d_source.eat( number.size() );
return true;
}
}
number += ch2;
break;
case Nachkomma:
if( ::isdigit( ch2 ) )
;
else if( ch2 == 'e' || ch2 == 'E' )
{
if( anzNachkomma == 0 )
return error("invalid number format");
state = Exponent1;
ch2 = 'e';
}else
{
// Zahl ist fertig
if( anzNachkomma == 0 )
return error("invalid number format");
d = number.toDouble( &ok );
if( !ok )
return error("invalid decimal format");
else
{
d_source.eat( number.size() );
return true;
}
}
anzNachkomma++;
number += ch2;
break;
case Exponent1:
if( ::isdigit( ch2 ) || ch2 == '+' || ch2 == '-' )
state = Exponent2;
else
return error("invalid number format");
number += ch2;
break;
case Exponent2:
if( ::isdigit( ch2 ) )
;
else
{
// Zahl ist fertig
d = number.toDouble( &ok );
if( !ok )
return error("invalid exponential format");
else
{
d_source.eat( number.size() );
return true;
}
}
number += ch2;
break;
}
d_source.peek( &ch2, 1 );
}
}
d_source.rewind();
return false;
}
void ExpressionLexer::eatSpace()
{
char ch;
d_source.peek( &ch, 1 );
while( ::isspace(ch) )
{
d_source.eat();
d_source.peek( &ch, 1 );
}
d_source.rewind();
}
bool SourceBuffer::peek(char *buf, int size)
{
bool ok = true;
int i;
for( i = 0; i < size; i++ )
{
if( d_peekPtr + i < d_source.size() )
buf[i] = d_source[ d_peekPtr + i ];
else
{
buf[i] = 0;
ok = false;
}
}
d_peekPtr += i;
return ok;
}
bool SourceBuffer::read(char *buf, int size)
{
peek( buf, size );
eat();
return true;
}
void SourceBuffer::eat(int count)
{
// Nach peak steht d_peekPtr auf dem nächsten zu lesenden Zeichen
if( count == -1 || d_peekPtr - d_eaten < count )
d_eaten = d_peekPtr;
else
{
d_eaten += count;
d_peekPtr = d_eaten;
}
for( int i = 0; i < d_eaten && i < d_source.size(); i++ )
d_source[i] = '@'; // TEST
}
void SourceBuffer::rewind()
{
d_peekPtr = d_eaten;
}
ExpressionParser::AstNode::~AstNode()
{
if( d_left )
delete d_left;
if( d_right )
delete d_right;
}
static QString _toTypeStr( int t )
{
switch( t )
{
case ExpressionParser::Constant:
return "Constant";
case ExpressionParser::BinOp:
return "Binop";
case ExpressionParser::UnOp:
return "Unop";
case ExpressionParser::DotOp:
return "DotOp";
case ExpressionParser::BraceOp:
return "BraceOp";
case ExpressionParser::IndexOp:
return "BracketOp";
case ExpressionParser::Name:
return "NameFetch";
default:
break;
}
return "Invalid";
}
static QString _toOpStr( int o )
{
switch(o)
{
case ExpressionLexer::Plus:
return "+";
case ExpressionLexer::Minus:
return "-";
case ExpressionLexer::Star:
return "*";
case ExpressionLexer::Slash:
return "/";
case ExpressionLexer::Hat:
return "^";
case ExpressionLexer::Percent:
return "%";
case ExpressionLexer::Concat:
return "..";
case ExpressionLexer::Lt:
return "<";
case ExpressionLexer::Leq:
return "<=";
case ExpressionLexer::Gt:
return ">";
case ExpressionLexer::Geq:
return ">=";
case ExpressionLexer::Eq:
return "==";
case ExpressionLexer::Neq:
return "~=";
case ExpressionLexer::And:
return "and";
case ExpressionLexer::Or:
return "or";
case ExpressionLexer::Not:
return "not";
case ExpressionLexer::Pound:
return "#";
default:
break;
}
return "?";
}
static QString _toValStr( int t, const QVariant& v )
{
switch( t )
{
case ExpressionParser::Constant:
if( v.isNull() )
return "nil";
else if( v.type() == QVariant::ByteArray )
return QString("\"%1\"").arg( v.toString() );
else
return v.toString();
case ExpressionParser::Name:
return v.toString();
case ExpressionParser::BinOp:
case ExpressionParser::UnOp:
return _toOpStr( v.toInt() );
default:
return "<none>";
}
}
void ExpressionParser::AstNode::dump(QTextStream &out, int level) const
{
const QString white( level * 4, QChar(' ') );
out << white << "Token: " << _toTypeStr( d_type ) << " Value: " << _toValStr( d_type, d_val ) << endl;
if( d_left )
d_left->dump( out, level + 1 );
if( d_right )
d_right->dump( out, level + 1 );
}
SourceBuffer::SourceBuffer(const QByteArray &source):d_source(source),d_eaten(0),d_peekPtr(0)
{
}
bool ExpressionLexer::process(const QByteArray &buf)
{
d_source = SourceBuffer(buf);
d_tokens.clear();
d_error.clear();
d_cur = 0;
try
{
Token t = fetchNext();
while( t.isValid() )
{
d_tokens.append(t);
t = fetchNext();
}
}catch( const LexEx& )
{
return false;
}
return true;
}
static QString _toValStr2( int t, const QVariant& v )
{
switch( t )
{
case ExpressionLexer::Token::Bool:
case ExpressionLexer::Token::Number:
case ExpressionLexer::Token::Name:
return QString("=%1").arg( v.toString() );
case ExpressionLexer::Token::String:
return QString("=\"%1\"").arg( v.toString() );
case ExpressionLexer::Token::Op:
return QString("='%1'").arg( _toOpStr( v.toInt() ) );
default:
return QString();
}
}
static QString _toTypeStr2( int t )
{
switch( t )
{
case ExpressionLexer::Token::Nil:
return "Nil";
case ExpressionLexer::Token::Bool:
return "Bool";
case ExpressionLexer::Token::Number:
return "Number";
case ExpressionLexer::Token::String:
return "String";
case ExpressionLexer::Token::Name:
return "Name";
case ExpressionLexer::Token::LBrack:
return "LBrack";
case ExpressionLexer::Token::RBrack:
return "RBrack";
case ExpressionLexer::Token::LBrace:
return "LBrace";
case ExpressionLexer::Token::RBrace: