com.hotels.styx.server.routing.antlr.StringCompareVisitor Maven / Gradle / Ivy
/*
Copyright (C) 2013-2018 Expedia Inc.
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 com.hotels.styx.server.routing.antlr;
import com.hotels.styx.server.routing.ConditionBaseVisitor;
import com.hotels.styx.server.routing.ConditionParser;
import org.antlr.v4.runtime.RuleContext;
import java.util.List;
import java.util.stream.Collectors;
import static com.hotels.styx.server.routing.antlr.Strings.stripFirstAndLastCharacter;
class StringCompareVisitor extends ConditionBaseVisitor> {
private final FunctionResolver functionResolver;
public StringCompareVisitor(FunctionResolver functionResolver) {
this.functionResolver = functionResolver;
}
@Override
public Expression visitString(ConditionParser.StringContext ctx) {
return (request, context) -> stripFirstAndLastCharacter(ctx.getText());
}
@Override
public Expression visitFunction(ConditionParser.FunctionContext ctx) {
String name = ctx.ID().getSymbol().getText();
List arguments = extractArguments(ctx.arglist());
FunctionResolver.PartialFunction function = functionResolver.resolveFunction(name, arguments);
return function::call;
}
private List extractArguments(ConditionParser.ArglistContext arglist) {
return arglist.string().stream()
.map(RuleContext::getText)
.map(Strings::stripFirstAndLastCharacter)
.collect(Collectors.toList());
}
}