libkf5kjs-dev 5.28.0-1 / usr / include / KF5 / kjs / makenodes.h

/*
 *  This file is part of the KDE libraries
 *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
 *  Copyright (C) 2006 Apple Computer, Inc.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifndef MAKENODES_H
#define MAKENODES_H

#include "nodes.h"
#include "identifier.h"

#define OPTIMIZE_NODES
//#define TRACE_OPTIMIZER

namespace KJS
{

// Shorthand wrappers for entering function contexts
static void inFuncExpr()
{
    parser().pushFunctionContext(FuncFl_Expr);
}

static void inFuncDecl()
{
    parser().pushFunctionContext(FuncFl_Decl);
}

static Node *makeAssignNode(Node *loc, Operator op, Node *expr)
{
    return new AssignNode(loc, op, expr);
}

static Node *makeConditionalNode(Node *l, Node *e1, Node *e2)
{
    return new ConditionalNode(l, e1, e2);
}

static Node *makePrefixNode(Node *expr, Operator op)
{
    return new PrefixNode(expr, op);
}

static Node *makePostfixNode(Node *expr, Operator op)
{
    return new PostfixNode(expr, op);
}

static Node *makeFunctionCallNode(Node *func, ArgumentsNode *args)
{
    Node *n = func->nodeInsideAllParens();

    if (!n->isLocation()) {
        return new FunctionCallValueNode(func, args);
    } else {
        return new FunctionCallReferenceNode(func, args);
    }
}

static Node *makeTypeOfNode(Node *expr)
{
    Node *n = expr->nodeInsideAllParens();

    // We only need to use the special path for variable references,
    // since they may throw a ResolveError on evaluate where we don't
    // want that...
    if (n->isVarAccessNode()) {
        return new TypeOfVarNode(static_cast<VarAccessNode *>(n));
    } else {
        return new TypeOfValueNode(expr);
    }
}

static Node *makeDeleteNode(Node *expr)
{
    Node *n = expr->nodeInsideAllParens();

    if (!n->isLocation()) {
        return new DeleteValueNode(expr);
    } else {
        return new DeleteReferenceNode(static_cast<LocationNode *>(n));    //### not 100% faithful listing?
    }
}

static bool makeGetterOrSetterPropertyNode(PropertyNode *&result, Identifier &getOrSet, Identifier &name, ParameterNode *params, FunctionBodyNode *body)
{
    PropertyNode::Type type;

    if (getOrSet == "get") {
        type = PropertyNode::Getter;
    } else if (getOrSet == "set") {
        type = PropertyNode::Setter;
    } else {
        return false;
    }

    result = new PropertyNode(new PropertyNameNode(name),
                              new FuncExprNode(CommonIdentifiers::shared()->nullIdentifier, body, params), type);

    return true;
}

static Node *makeAddNode(Node *n1, Node *n2, Operator op)
{
#ifdef OPTIMIZE_NODES
    if (n1->isNumber()) {
        if (n2->isNumber()) {
#ifdef TRACE_OPTIMIZER
            printf("Optimizing ADDNODE NUMBER NUMBER as NUMBER\n");
#endif
            NumberNode *number1 = static_cast< NumberNode * >(n1);
            NumberNode *number2 = static_cast< NumberNode * >(n2);
            double d1 = number1->value();
            double d2 = number2->value();
            number1->setValue(op == OpPlus ? d1 + d2 : d1 - d2);
            return number1;
        }
#ifdef TRACE_OPTIMIZER
        printf("could optimize as ADD NODE NUMBER\n");
#endif
    }
    if (n2->isNumber()) {
#ifdef TRACE_OPTIMIZER
        printf("could optimize as ADD NODE NUMBER\n");
#endif
    }
    if (op == OpPlus && n1->isString() && n2->isString()) {
#ifdef TRACE_OPTIMIZER
        printf("Optimizing ADDNODE STRING STRING as STRING\n");
#endif
        StringNode *str1 = static_cast<StringNode *>(n1);
        StringNode *str2 = static_cast<StringNode *>(n2);
        str1->setValue(str1->value() + str2->value());
        return str1;
    }
#endif
    return new BinaryOperatorNode(n1, n2, op);
}

static Node *makeMultNode(Node *n1, Node *n2, Operator op)
{
#ifdef OPTIMIZE_NODES
    if (n1->isNumber()) {
        if (n2->isNumber()) {
#ifdef TRACE_OPTIMIZER
            printf("Optimizing MULTNODE NUMBER NUMBER as NUMBER\n");
#endif
            NumberNode *number1 = static_cast< NumberNode * >(n1);
            NumberNode *number2 = static_cast< NumberNode * >(n2);
            double d1 = number1->value();
            double d2 = number2->value();
            double res;
            if (op == OpMult) {
                res = d1 * d2;
            } else if (op == OpDiv) {
                res = d1 / d2;
            } else { // OpMod
                res = fmod(d1, d2);
            }
            number1->setValue(res);
            return number1;
        }
#ifdef TRACE_OPTIMIZER
        printf("could optimize as MULT NODE NUMBER\n");
#endif
    }
    if (n2->isNumber()) {
#ifdef TRACE_OPTIMIZER
        printf("could optimize as MULT NODE NUMBER\n");
#endif
    }
#endif
    return new BinaryOperatorNode(n1, n2, op);
}

static Node *makeShiftNode(Node *n1, Node *n2, Operator op)
{
#ifdef OPTIMIZE_NODES
    if (n1->isNumber() && n2->isNumber()) {
#ifdef TRACE_OPTIMIZER
        printf("Optimizing MULTNODE NUMBER NUMBER as NUMBER\n");
#endif
        NumberNode *number1 = static_cast< NumberNode * >(n1);
        NumberNode *number2 = static_cast< NumberNode * >(n2);
        double val = number1->value();
        uint32_t shiftAmount = toUInt32(number2->value());
        switch (op) {
        case OpLShift:
            // operator <<
            number1->setValue(toInt32(val) << (shiftAmount & 0x1f));
            break;
        case OpRShift:
            // operator >>
            number1->setValue(toInt32(val) >> (shiftAmount & 0x1f));
            break;
        case OpURShift:
            // operator >>>
            number1->setValue(toUInt32(val) >> (shiftAmount & 0x1f));
            break;
        default:
            assert(false);
            break;
        }
        return number1;
    }
#endif
    return new BinaryOperatorNode(n1, n2, op);
}

static Node *makeRelationalNode(Node *n1, Operator op, Node *n2)
{
    return new BinaryOperatorNode(n1, n2, op);
}

static Node *makeEqualNode(Node *n1, Operator op, Node *n2)
{
    return new BinaryOperatorNode(n1, n2, op);
}

static Node *makeBitOperNode(Node *n1, Operator op, Node *n2)
{
    return new BinaryOperatorNode(n1, n2, op);
}

static Node *makeBinaryLogicalNode(Node *n1, Operator op, Node *n2)
{
    return new BinaryLogicalNode(n1, op, n2);
}

static Node *makeUnaryPlusNode(Node *n)
{
#ifdef OPTIMIZE_NODES
    if (n->isNumber()) {
#ifdef TRACE_OPTIMIZER
        printf("Optimizing UNARYPLUS NUMBER\n");
#endif
        return n;
    }
#endif
    return new UnaryPlusNode(n);
}

static Node *makeNegateNode(Node *n)
{
#ifdef OPTIMIZE_NODES
    if (n->isNumber()) {
#ifdef TRACE_OPTIMIZER
        printf("Optimizing NEGATE NUMBER\n");
#endif
        NumberNode *number = static_cast <NumberNode *>(n);
        number->setValue(-number->value());
        return number;
    }
#endif
    return new NegateNode(n);
}

static Node *makeBitwiseNotNode(Node *n)
{
#ifdef OPTIMIZE_NODES
    if (n->isNumber()) {
#ifdef TRACE_OPTIMIZER
        printf("Optimizing BITWISENOT NUMBER\n");
#endif
        NumberNode *number = static_cast <NumberNode *>(n);
        number->setValue(~toInt32(number->value()));
        return number;
    }
#endif
    return new BitwiseNotNode(n);
}

static Node *makeLogicalNotNode(Node *n)
{
    return new LogicalNotNode(n);
}

static Node *makeGroupNode(Node *n)
{
    if (n->isVarAccessNode() || n->isGroupNode()) {
        return n;
    }
    return new GroupNode(n);
}

static StatementNode *makeIfNode(Node *e, StatementNode *s1, StatementNode *s2)
{
    return new IfNode(e, s1, s2);
}

static StatementNode *makeImportNode(PackageNameNode *n,
                                     bool wildcard, const Identifier &a)
{
    ImportStatement *stat = new ImportStatement(n);
    if (wildcard) {
        stat->enableWildcard();
    }
    stat->setAlias(a);

    return stat;
}

static StatementNode *makeLabelNode(const Identifier &l, StatementNode *s)
{
    return new LabelNode(l, s);
}

} // namespace KJS

#endif
// vi: set sw=4 :