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Google App Engine compliant variation of FreeMarker.
FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
/*
* Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
*
* 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 freemarker.core;
import freemarker.template.TemplateException;
/**
* A class that handles comparisons.
*/
final class ComparisonExpression extends BooleanExpression {
private final Expression left;
private final Expression right;
private final int operation;
private final String opString;
ComparisonExpression(Expression left, Expression right, String opString) {
this.left = left;
this.right = right;
opString = opString.intern();
this.opString = opString;
if (opString == "==" || opString == "=") {
operation = EvalUtil.CMP_OP_EQUALS;
}
else if (opString == "!=") {
operation = EvalUtil.CMP_OP_NOT_EQUALS;
}
else if (opString == "gt" || opString == "\\gt" || opString == ">" || opString == ">") {
operation = EvalUtil.CMP_OP_GREATER_THAN;
}
else if (opString == "gte" || opString == "\\gte" || opString == ">=" || opString == ">=") {
operation = EvalUtil.CMP_OP_GREATER_THAN_EQUALS;
}
else if (opString== "lt" || opString == "\\lt" || opString == "<" || opString == "<") {
operation = EvalUtil.CMP_OP_LESS_THAN;
}
else if (opString == "lte" || opString == "\\lte" || opString == "<=" || opString == "<=") {
operation = EvalUtil.CMP_OP_LESS_THAN_EQUALS;
}
else {
throw new BugException("Unknown comparison operator " + opString);
}
}
/*
* WARNING! This algorithm is duplicated in SequenceBuiltins.modelsEqual.
* Thus, if you update this method, then you have to update that too!
*/
boolean evalToBoolean(Environment env) throws TemplateException {
return EvalUtil.compare(left, operation, opString, right, this, env);
}
public String getCanonicalForm() {
return left.getCanonicalForm() + ' ' + opString + ' ' + right.getCanonicalForm();
}
String getNodeTypeSymbol() {
return opString;
}
boolean isLiteral() {
return constantValue != null || (left.isLiteral() && right.isLiteral());
}
protected Expression deepCloneWithIdentifierReplaced_inner(
String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) {
return new ComparisonExpression(
left.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState),
right.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState),
opString);
}
int getParameterCount() {
return 2;
}
Object getParameterValue(int idx) {
return idx == 0 ? left : right;
}
ParameterRole getParameterRole(int idx) {
return ParameterRole.forBinaryOperatorOperand(idx);
}
}