com.google.javascript.jscomp.resources.GwtProperties Maven / Gradle / Ivy
/*
* Copyright 2016 The Closure Compiler 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 com.google.javascript.jscomp.resources;
import com.google.common.collect.ImmutableMap;
import java.util.Collection;
import java.util.Map;
/**
* GWT-compatible helper for dealing with Java .properties files. The format is probably not fully
* parsed by this code, but is suitable for simple use-cases inside Closure.
*/
public class GwtProperties {
private final Map contents;
private GwtProperties(Map contents) {
this.contents = contents;
}
/**
* @param key Property key to retrieve.
* @return The string value of this key.
*/
public String getProperty(String key) {
return contents.get(key);
}
/** @return The collection of property names. */
public Collection propertyNames() {
return contents.keySet();
}
private static String trimLeft(String str) {
for (int i = 0; i < str.length(); i++) {
if (str.charAt(i) != ' ') {
return str.substring(i);
}
}
return str;
}
private static int findDelimiter(String line) {
if (line.contains(":") || line.contains("=")) {
if (line.indexOf(':') == -1) {
return line.indexOf('=');
}
if (line.indexOf('=') == -1) {
return line.indexOf(':');
}
// Both delimeters exist!
return Math.min(line.indexOf('='), line.indexOf(':'));
}
// If no : or =, delimiter is first whitespace.
return line.indexOf(' ');
}
/**
* Constructs a new {@link GwtProperties} from the given source string.
*
* @param source To load from.
* @return The {@link GwtProperties} object from the source.
*/
public static GwtProperties load(String source) {
String[] lines = source.split("\r?\n");
ImmutableMap.Builder builder = ImmutableMap.builder();
for (int i = 0; i < lines.length; ++i) {
String line = lines[i];
if (line.isEmpty() || line.startsWith("#") || line.startsWith("!")) {
continue; // skip if empty or starts with # or !
}
String data = "";
int delimeterIndex = findDelimiter(line);
if (delimeterIndex == -1) {
continue;
}
// Remove whitespace on both sides of key.
String key = line.substring(0, delimeterIndex).trim();
// Remove whitespace only on left side of data value. Trailing white space is data.
line = trimLeft(line.substring(delimeterIndex + 1));
while (true) {
if (line.endsWith("\\")) {
data += line.substring(0, line.length() - 1);
if (i + 1 == lines.length) {
break;
}
line = trimLeft(lines[++i]);
} else {
data += line;
break;
}
}
builder.put(key, data);
}
return new GwtProperties(builder.build());
}
}