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/*
* Copyright (C) 2018 Google, 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.google.escapevelocity;
import com.google.common.collect.ImmutableList;
import java.util.List;
/**
* A parsing node that will be deleted during the construction of the parse tree, to be replaced
* by a higher-level construct such as {@link DirectiveNode.IfNode}. See {@link Parser#parse()}
* for a description of the way these tokens work.
*
* @author emcmanus@google.com (Éamonn McManus)
*/
abstract class TokenNode extends Node {
TokenNode(String resourceName, int lineNumber) {
super(resourceName, lineNumber);
}
/**
* This method always throws an exception because a node like this should never be found in the
* final parse tree.
*/
@Override Object evaluate(EvaluationContext vars) {
throw new UnsupportedOperationException(getClass().getName());
}
/**
* The name of the token, for use in parse error messages.
*/
abstract String name();
/**
* A synthetic node that represents the end of the input. This node is the last one in the
* initial token string and also the last one in the parse tree.
*/
static final class EofNode extends TokenNode {
EofNode(String resourceName, int lineNumber) {
super(resourceName, lineNumber);
}
@Override
String name() {
return "end of file";
}
}
static final class EndTokenNode extends TokenNode {
EndTokenNode(String resourceName, int lineNumber) {
super(resourceName, lineNumber);
}
@Override String name() {
return "#end";
}
}
/**
* A node in the parse tree representing a comment. Comments are introduced by {@code ##} and
* extend to the end of the line. The only reason for recording comment nodes is so that we can
* skip space between a comment and a following {@code #set}, to be compatible with Velocity
* behaviour.
*/
static class CommentTokenNode extends TokenNode {
CommentTokenNode(String resourceName, int lineNumber) {
super(resourceName, lineNumber);
}
@Override String name() {
return "##";
}
}
abstract static class IfOrElseIfTokenNode extends TokenNode {
final ExpressionNode condition;
IfOrElseIfTokenNode(ExpressionNode condition) {
super(condition.resourceName, condition.lineNumber);
this.condition = condition;
}
}
static final class IfTokenNode extends IfOrElseIfTokenNode {
IfTokenNode(ExpressionNode condition) {
super(condition);
}
@Override String name() {
return "#if";
}
}
static final class ElseIfTokenNode extends IfOrElseIfTokenNode {
ElseIfTokenNode(ExpressionNode condition) {
super(condition);
}
@Override String name() {
return "#elseif";
}
}
static final class ElseTokenNode extends TokenNode {
ElseTokenNode(String resourceName, int lineNumber) {
super(resourceName, lineNumber);
}
@Override String name() {
return "#else";
}
}
static final class ForEachTokenNode extends TokenNode {
final String var;
final ExpressionNode collection;
ForEachTokenNode(String var, ExpressionNode collection) {
super(collection.resourceName, collection.lineNumber);
this.var = var;
this.collection = collection;
}
@Override String name() {
return "#foreach";
}
}
static final class NestedTokenNode extends TokenNode {
final ImmutableList<Node> nodes;
NestedTokenNode(String resourceName, ImmutableList<Node> nodes) {
super(resourceName, 1);
this.nodes = nodes;
}
@Override String name() {
return "#parse(\"" + resourceName + "\")";
}
}
static final class MacroDefinitionTokenNode extends TokenNode {
final String name;
final ImmutableList<String> parameterNames;
MacroDefinitionTokenNode(
String resourceName, int lineNumber, String name, List<String> parameterNames) {
super(resourceName, lineNumber);
this.name = name;
this.parameterNames = ImmutableList.copyOf(parameterNames);
}
@Override String name() {
return "#macro(" + name + ")";
}
}
}
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