net.hasor.dataql.compiler.cc.SubscriptRouteVariableInstCompiler Maven / Gradle / Ivy
/*
* Copyright 2008-2009 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.hasor.dataql.compiler.cc;
import net.hasor.dataql.compiler.qil.CompilerContext;
import net.hasor.dataql.compiler.qil.InstCompiler;
import net.hasor.dataql.compiler.qil.InstQueue;
import net.hasor.dataql.compiler.qil.Label;
import net.hasor.dataql.domain.TypeOfEnum;
import net.hasor.dataql.parser.ast.Expression;
import net.hasor.dataql.parser.ast.token.StringToken;
import net.hasor.dataql.parser.ast.value.SubscriptRouteVariable;
import net.hasor.dataql.parser.ast.value.SubscriptRouteVariable.SubType;
/**
* 对 RouteVariable 的下标操作
* @author 赵永春 ([email protected])
* @version : 2017-03-23
*/
public class SubscriptRouteVariableInstCompiler implements InstCompiler {
@Override
public void doCompiler(SubscriptRouteVariable astInst, InstQueue queue, CompilerContext compilerContext) {
compilerContext.findInstCompilerByInst(astInst.getParent()).doCompiler(queue);
//
SubType subType = astInst.getSubType();
if (subType == SubType.String) {
StringToken subValue = astInst.getSubValue();
instLocation(queue, subValue);
queue.inst(GET, subValue.getValue());
}
if (subType == SubType.Integer) {
StringToken subValue = astInst.getSubValue();
instLocation(queue, subValue);
queue.inst(PULL, Integer.parseInt(subValue.getValue()));
}
if (subType == SubType.Expr) {
Label nextLabel = null;
Label finalLabel = queue.labelDef();
//
Expression exprValue = astInst.getExprValue();
compilerContext.findInstCompilerByInst(exprValue).doCompiler(queue);
instLocation(queue, exprValue);
queue.inst(COPY); // 表达式值Copy 一份用来计算 typeof
queue.inst(TYPEOF);
queue.inst(COPY); // typeof 的值Copy 一份用来做两次 if 判断
//
nextLabel = queue.labelDef();
queue.inst(LDC_S, TypeOfEnum.String.typeCode());
queue.inst(DO, "==");
queue.inst(IF, nextLabel);
queue.inst(POP);
queue.inst(GET);
queue.inst(GOTO, finalLabel);
queue.inst(LABEL, nextLabel);
//
nextLabel = queue.labelDef();
queue.inst(LDC_S, TypeOfEnum.Number.typeCode());
queue.inst(DO, "==");
queue.inst(IF, nextLabel);
queue.inst(PULL);
queue.inst(GOTO, finalLabel);
queue.inst(LABEL, nextLabel);
//
queue.inst(LDC_S, "type is not string or number.");
queue.inst(THROW, 500);
queue.inst(LABEL, finalLabel);
}
}
}