| // 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; |
| } |
| } |