/*
* Copyright 2008 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.template.soy.jssrc.restricted;
import com.google.common.base.Objects;
/**
* Value class to represent a JS expression. Includes the text of the expression as well as the
* precedence of the top-most operator.
*
* <p> Important: This class may only be used in implementing plugins (e.g. functions, directives).
*
* <p> Note that even though the precedence numbers we use are for Soy, the precedence ordering of
* the Soy expression operators matches that of JS (as well as Java), so the precedence numbers are
* correct when used for generating JS code as well.
*
* @author Kai Huang
*/
public class JsExpr {
/** The JS expression text. */
private final String text;
/** The precedence of the top-most operator, or Integer.MAX_VALUE. */
private final int precedence;
/**
* @param text The JS expression text.
* @param precedence The precedence of the top-most operator. Or Integer.MAX_VALUE.
*/
public JsExpr(String text, int precedence) {
this.text = text;
this.precedence = precedence;
}
/** Returns the JS expression text. */
public String getText() {
return text;
}
/** Returns the precedence of the top-most operator, or Integer.MAX_VALUE. */
public int getPrecedence() {
return precedence;
}
@Override public String toString() {
return Objects.toStringHelper(this).add("text", text).add("precedence", precedence).toString();
}
@Override public boolean equals(Object other) {
if (other == null || this.getClass() != other.getClass()) {
return false;
}
JsExpr otherCast = (JsExpr) other;
if (this.text.equals(otherCast.text)) {
if (this.precedence != otherCast.precedence) {
throw new AssertionError(); // if text is equal, precedence should also be equal
}
return true;
} else {
return false;
}
}
@Override public int hashCode() {
return Objects.hashCode(text, precedence);
}
}
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