com.google.code.maven_replacer_plugin.TokenValueMapFactory Maven / Gradle / Ivy

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Maven plugin to replace tokens in a given file with a value
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/*
Original work Copyright (c) 2014 beiliubei
Modified work Copyright (c) 2019 Isaias Arellano - [email protected]

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

The Software shall be used for Good, not Evil.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */
package com.google.code.maven_replacer_plugin;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import com.google.code.maven_replacer_plugin.file.FileUtils;


public class TokenValueMapFactory {

	private static final char SEPARATOR_ESCAPER = '\\';
	private static final char SEPARATOR = '=';
	private static final String COMMENT_PREFIX = "#";

	private final FileUtils fileUtils;

	public TokenValueMapFactory(FileUtils fileUtils) {
		this.fileUtils = fileUtils;
	}
	
	public List replacementsForVariable(String variable, boolean commentsEnabled, boolean unescape, String encoding) {
		StringTokenizer tokenizer = new StringTokenizer(variable, ",");
		String fragment = null;
		List replacements = new ArrayList();
		while (tokenizer.hasMoreTokens()) {
			fragment = tokenizer.nextToken();
			if (ignoreFragment(fragment, commentsEnabled)) {
				continue;
			}

			appendReplacement(replacements, fragment, unescape, encoding);
		}
		return replacements;
	}

	public List replacementsForFile(String tokenValueMapFile, boolean commentsEnabled, 
			boolean unescape, String encoding) 
		throws IOException {
		String contents = fileUtils.readFile(tokenValueMapFile, encoding);
		BufferedReader reader = new BufferedReader(new StringReader(contents));

		String fragment = null;
		List replacements = new ArrayList();
		while ((fragment = reader.readLine()) != null) {
			fragment = fragment.trim();
			if (ignoreFragment(fragment, commentsEnabled)) {
				continue;
			}

			appendReplacement(replacements, fragment, unescape, encoding);
		}
		return replacements;
	}
	
	private void appendReplacement(List replacements, String fragment, boolean unescape, String encoding) {
		StringBuilder token = new StringBuilder();
		String value = "";
		boolean settingToken = true;
		for (int i=0; i < fragment.length(); i++) {
			if (i == 0 && fragment.charAt(0) == SEPARATOR) {
				throw new IllegalArgumentException(getNoValueErrorMsgFor(fragment));
			}

			if (settingToken && !isSeparatorAt(i, fragment)) {
				token.append(fragment.charAt(i));
			} else if (isSeparatorAt(i, fragment)) {
				settingToken = false;
				continue;
			} else {
				value = fragment.substring(i);
				break;
			}
		}

		if (settingToken) {
			return;
		}
		
		String tokenVal = token.toString().trim();
		replacements.add(new Replacement(fileUtils, tokenVal, value.trim(), unescape, null, encoding, null, null));
	}

	private boolean isSeparatorAt(int i, String line) {
		return line.charAt(i) == SEPARATOR && line.charAt(i - 1) != SEPARATOR_ESCAPER;
	}

	private String getNoValueErrorMsgFor(String line) {
		return "No value for token: " + line + ". Make sure that tokens have values in pairs in the format: token=value";
	}

	private boolean ignoreFragment(String line, boolean commentsEnabled) {
		return line.length() == 0 || commentsEnabled && line.startsWith(COMMENT_PREFIX);
	}
}