// Copyright 2014 The Bazel Authors. All rights reserved. // // 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.devtools.build.lib.syntax; import com.google.devtools.build.lib.vfs.PathFragment; import java.io.IOException; /** * An abstraction for reading input from a file or taking it as a pre-cooked * char[] or String. */ public abstract class ParserInputSource { protected ParserInputSource() {} /** * Returns the content of the input source. */ public abstract char [] getContent(); /** * Returns the path of the input source. Note: Once constructed, this object * will never re-read the content from path. */ public abstract PathFragment getPath(); public static ParserInputSource create(byte[] bytes, PathFragment path) throws IOException { char[] content = convertFromLatin1(bytes); return create(content, path); } /** * Create an input source from the given content, and associate path with * this source. Path will be used in error messages etc. but we will *never* * attempt to read the content from path. */ public static ParserInputSource create(String content, PathFragment path) { return create(content.toCharArray(), path); } /** * Create an input source from the given content, and associate path with * this source. Path will be used in error messages etc. but we will *never* * attempt to read the content from path. */ public static ParserInputSource create(final char[] content, final PathFragment path) { return new ParserInputSource() { @Override public char[] getContent() { return content; } @Override public PathFragment getPath() { return path; } }; } private static char[] convertFromLatin1(byte[] content) { char[] latin1 = new char[content.length]; for (int i = 0; i < latin1.length; i++) { // yeah, latin1 is this easy! :-) latin1[i] = (char) (0xff & content[i]); } return latin1; } }