102 lines
2.7 KiB
Java
102 lines
2.7 KiB
Java
/*
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* Copyright (C) 2016 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.copybara;
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import static com.google.common.base.Preconditions.checkState;
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import com.google.re2j.Matcher;
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import com.google.re2j.Pattern;
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/**
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* A simple line finder/parser for labels like:
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* <ul>
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* <li>foo = bar</li>
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* <li>baz : foo</li>
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* </ul>
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*
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* <p>In general this class should only be used in {@code Origin}s to create a labels map.
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* During transformations/destination, it can be used to check if a line is a line but
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* never to find labels. Use {@link TransformWork#getLabel(String)} instead, since it looks
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* in more places for labels.
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*
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* TODO(malcon): Rename to MaybeLabel
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*/
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public class LabelFinder {
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private static final String VALID_LABEL_EXPR = "([\\w-]+)";
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public static final Pattern VALID_LABEL = Pattern.compile(VALID_LABEL_EXPR);
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private static final Pattern URL = Pattern.compile(VALID_LABEL + "://.*");
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private static final Pattern LABEL_PATTERN = Pattern.compile(
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"^" + VALID_LABEL_EXPR + "( *[:=] ?)(.*)");
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private final Matcher matcher;
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private final String line;
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public LabelFinder(String line) {
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matcher = LABEL_PATTERN.matcher(line);
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this.line = line;
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}
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public boolean isLabel() {
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// It is a line if it looks like a line but it doesn't look like a url (foo://bar)
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return matcher.matches() && !URL.matcher(line).matches();
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}
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public boolean isLabel(String labelName) {
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return isLabel() && getName().equals(labelName);
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}
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/**
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* Returns the name of the label.
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*
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* <p>Use isLabel() method before calling this method.
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*/
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public String getName() {
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checkIsLabel();
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return matcher.group(1);
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}
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/**
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* Returns the separator of the label.
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*
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* <p>Use isLabel() method before calling this method.
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*/
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public String getSeparator() {
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checkIsLabel();
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return matcher.group(2);
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}
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/**
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* Returns the value of the label.
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*
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* <p>Use isLabel() method before calling this method.
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*/
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public String getValue() {
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checkIsLabel();
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return matcher.group(3);
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}
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private void checkIsLabel() {
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checkState(isLabel(), "Not a label: '" + line + "'. Please call isLabel() first");
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}
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public String getLine() {
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return line;
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}
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}
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