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Simple library for generating code.
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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.codegen.bytecode;

import static org.objectweb.asm.Opcodes.IFEQ;
import static org.objectweb.asm.Opcodes.IFNE;
import static org.objectweb.asm.Opcodes.IFNONNULL;
import static org.objectweb.asm.Opcodes.IFNULL;

import org.neo4j.codegen.Expression;
import org.neo4j.codegen.ExpressionVisitor;
import org.neo4j.codegen.FieldReference;
import org.neo4j.codegen.LocalVariable;
import org.neo4j.codegen.MethodReference;
import org.neo4j.codegen.TypeReference;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;

class JumpVisitor implements ExpressionVisitor {
    private final ExpressionVisitor eval;
    private final MethodVisitor methodVisitor;
    private final Label target;

    JumpVisitor(ExpressionVisitor eval, MethodVisitor methodVisitor, Label target) {
        this.eval = eval;
        this.methodVisitor = methodVisitor;
        this.target = target;
    }

    @Override
    public void invoke(Expression target, MethodReference method, Expression[] arguments) {
        eval.invoke(target, method, arguments);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void invoke(MethodReference method, Expression[] arguments) {
        eval.invoke(method, arguments);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void load(LocalVariable variable) {
        eval.load(variable);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void arrayLoad(Expression array, Expression index) {
        eval.arrayLoad(array, index);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void arraySet(Expression array, Expression index, Expression value) {
        eval.arraySet(array, index, value);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void arrayLength(Expression array) {
        eval.arrayLength(array);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void getField(Expression target, FieldReference field) {
        eval.getField(target, field);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void constant(Object value) {
        eval.constant(value);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void getStatic(FieldReference field) {
        eval.getStatic(field);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void not(Expression expression) {
        if (expression instanceof Expression.Or) {
            notOr((Expression.Or) expression);
        } else if (expression instanceof Expression.And) {
            notAnd((Expression.And) expression);
        } else {
            expression.accept(eval);
            methodVisitor.visitJumpInsn(IFNE, this.target);
        }
    }

    @Override
    public void ternary(Expression test, Expression onTrue, Expression onFalse) {
        eval.ternary(test, onTrue, onFalse);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void equal(Expression lhs, Expression rhs) {
        eval.equal(lhs, rhs);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void notEqual(Expression lhs, Expression rhs) {
        eval.equal(lhs, rhs);
        methodVisitor.visitJumpInsn(IFNE, this.target);
    }

    @Override
    public void isNull(Expression expression) {
        expression.accept(eval);
        methodVisitor.visitJumpInsn(IFNONNULL, this.target);
    }

    @Override
    public void notNull(Expression expression) {
        expression.accept(eval);
        methodVisitor.visitJumpInsn(IFNULL, this.target);
    }

    @Override
    public void or(Expression... expressions) {
        Label label = new Label();
        for (int i = 0; i < expressions.length; i++) {
            expressions[i].accept(eval);
            if (i < expressions.length - 1) {
                methodVisitor.visitJumpInsn(IFNE, label);
            } else {
                methodVisitor.visitJumpInsn(IFEQ, this.target);
            }
        }
        methodVisitor.visitLabel(label);
    }

    @Override
    public void and(Expression... expressions) {
        for (Expression expression : expressions) {
            expression.accept(this);
        }
    }

    @Override
    public void gt(Expression lhs, Expression rhs) {
        eval.gt(lhs, rhs);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void gte(Expression lhs, Expression rhs) {
        eval.gte(lhs, rhs);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void lt(Expression lhs, Expression rhs) {
        eval.lt(lhs, rhs);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void lte(Expression lhs, Expression rhs) {
        eval.lte(lhs, rhs);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void unbox(Expression expression) {
        eval.unbox(expression);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void loadThis(String sourceName) {
        throw new IllegalArgumentException("'" + sourceName + "' is not a boolean expression");
    }

    @Override
    public void newInstance(TypeReference type) {
        throw new IllegalArgumentException("'new' is not a boolean expression");
    }

    @Override
    public void add(Expression lhs, Expression rhs) {
        throw new IllegalArgumentException("'+' is not a boolean expression");
    }

    @Override
    public void subtract(Expression lhs, Expression rhs) {
        throw new IllegalArgumentException("'-' is not a boolean expression");
    }

    @Override
    public void multiply(Expression lhs, Expression rhs) {
        throw new IllegalArgumentException("'*' is not a boolean expression");
    }

    @Override
    public void cast(TypeReference type, Expression expression) {
        throw new IllegalArgumentException("cast is not a boolean expression");
    }

    @Override
    public void instanceOf(TypeReference type, Expression expression) {
        eval.instanceOf(type, expression);
        methodVisitor.visitJumpInsn(IFEQ, this.target);
    }

    @Override
    public void newInitializedArray(TypeReference type, Expression... constants) {
        throw new IllegalArgumentException("'new' (array) is not a boolean expression");
    }

    @Override
    public void newArray(TypeReference type, int size) {
        throw new IllegalArgumentException("'new' (array) is not a boolean expression");
    }

    @Override
    public void newArray(TypeReference type, Expression size) {
        throw new IllegalArgumentException("'new' (array) is not a boolean expression");
    }

    @Override
    public void longToDouble(Expression expression) {
        throw new IllegalArgumentException("cast is not a boolean expression");
    }

    @Override
    public void pop(Expression expression) {
        throw new IllegalArgumentException("pop is not a boolean expression");
    }

    @Override
    public void box(Expression expression) {
        throw new IllegalArgumentException("box is not a boolean expression");
    }

    private void notOr(Expression.Or or) {
        for (Expression expression : or.expressions()) {
            expression.accept(eval);
            methodVisitor.visitJumpInsn(IFNE, this.target);
        }
    }

    private void notAnd(Expression.And and) {
        Label label = new Label();
        Expression[] expressions = and.expressions();
        for (int i = 0; i < expressions.length; i++) {
            expressions[i].accept(eval);
            if (i < expressions.length - 1) {
                methodVisitor.visitJumpInsn(IFEQ, label);
            } else {
                methodVisitor.visitJumpInsn(IFNE, this.target);
            }
        }
        methodVisitor.visitLabel(label);
    }
}