com.aspectran.shell.command.CommandLineParser Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2022 The Aspectran Project
*
* 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.aspectran.shell.command;
import com.aspectran.core.util.StringUtils;
import com.aspectran.core.util.logging.Logger;
import com.aspectran.core.util.logging.LoggerFactory;
import com.aspectran.shell.command.option.DefaultOptionParser;
import com.aspectran.shell.command.option.OptionParser;
import com.aspectran.shell.command.option.OptionParserException;
import com.aspectran.shell.command.option.Options;
import com.aspectran.shell.command.option.ParsedOptions;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* The Command Line Parser.
*/
public class CommandLineParser {
private static final Pattern ARGS_PATTERN = Pattern.compile("[\\s]+\"([^\"]*)\"|\"([^\"]*)\"|[\\s]+'([^']*)'|'([^']*)'|([^\\s\"']+)");
private static final Pattern REDIRECTION_PATTERN = Pattern.compile("(>>)|(>)|(\")|(\')");
private static final Logger logger = LoggerFactory.getLogger(CommandLineParser.class);
private final String commandLine;
private String commandName;
private String[] args;
private List redirectionList;
public CommandLineParser(String commandLine) {
this.commandLine = parseOutputRedirection(commandLine);
if (StringUtils.hasLength(this.commandLine)) {
this.args = splitCommandLine(this.commandLine);
}
shift();
}
public void shift() {
if (args != null && args.length > 0) {
if (!StringUtils.hasLength(args[0])) {
shift();
} else {
commandName = args[0];
if (args.length > 1) {
args = Arrays.copyOfRange(args, 1, args.length);
} else {
args = new String[0];
}
}
}
}
public String getCommandLine() {
return commandLine;
}
public String getCommandName() {
return commandName;
}
public void setCommandName(String commandName) {
this.commandName = commandName;
}
public String[] getArgs() {
return args;
}
public boolean hasArgs() {
return (args != null && args.length > 0);
}
public ParsedOptions parseOptions(Options options) throws OptionParserException {
OptionParser parser = new DefaultOptionParser();
return parser.parse(options, args, options.isSkipParsingAtNonOption());
}
/**
* Returns a list of the output redirection extracted
* from the command line.
* @return a list of the output redirection
*/
public List getRedirectionList() {
return redirectionList;
}
private String[] splitCommandLine(String commandLine) {
List list = new ArrayList<>();
Matcher m = ARGS_PATTERN.matcher(commandLine);
while (m.find()) {
if (m.group(1) != null) {
list.add(m.group(1));
} else if (m.group(2) != null) {
if (!list.isEmpty()) {
int index = list.size() - 1;
list.set(index, list.get(index) + m.group(2));
} else {
list.add(m.group(2));
}
} else if (m.group(3) != null) {
list.add(m.group(3));
} else if (m.group(4) != null) {
if (!list.isEmpty()) {
int index = list.size() - 1;
list.set(index, list.get(index) + m.group(4));
} else {
list.add(m.group(4));
}
} else {
list.add(m.group(5));
}
}
return list.toArray(new String[0]);
}
private String parseOutputRedirection(String line) {
if (!StringUtils.hasLength(line)) {
return null;
}
String commandLine = line;
Matcher matcher = REDIRECTION_PATTERN.matcher(line);
List redirectionList = new ArrayList<>();
OutputRedirection prevRedirection = null;
boolean hasDoubleQuote = false;
boolean hasSingleQuote = false;
while (matcher.find()) {
if (matcher.group(1) != null && !hasDoubleQuote && !hasSingleQuote) {
String str = line.substring(0, matcher.start(1)).trim();
if (prevRedirection != null) {
prevRedirection.setOperand(stripQuotes(str));
} else {
commandLine = str;
}
prevRedirection = new OutputRedirection(OutputRedirection.Operator.APPEND_OUT);
redirectionList.add(prevRedirection);
line = line.substring(matcher.end(1));
matcher = REDIRECTION_PATTERN.matcher(line);
}
else if (matcher.group(2) != null && !hasDoubleQuote && !hasSingleQuote) {
String str = line.substring(0, matcher.start(2)).trim();
if (prevRedirection != null) {
prevRedirection.setOperand(stripQuotes(str));
} else {
commandLine = str;
}
prevRedirection = new OutputRedirection(OutputRedirection.Operator.OVERWRITE_OUT);
redirectionList.add(prevRedirection);
line = line.substring(matcher.end(2));
matcher = REDIRECTION_PATTERN.matcher(line);
}
else if (matcher.group(3) != null) {
hasDoubleQuote = !hasDoubleQuote;
}
else if (matcher.group(4) != null) {
hasSingleQuote = !hasSingleQuote;
}
}
if (prevRedirection != null) {
prevRedirection.setOperand(stripQuotes(line.trim()));
}
if (!redirectionList.isEmpty()) {
this.redirectionList = redirectionList;
if (logger.isDebugEnabled()) {
logger.debug("Output Redirection: " + OutputRedirection.serialize(redirectionList));
}
}
if (StringUtils.hasLength(commandLine)) {
return commandLine;
} else {
return null;
}
}
private String stripQuotes(String str) {
if (str.length() > 1 &&
(str.startsWith("\"") && str.endsWith("\"") ||
str.startsWith("'") && str.endsWith("'"))) {
return str.substring(1, str.length() - 1);
} else {
return str;
}
}
}