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/*******************************************************************************
* Copyright (c) 2011, 2012 Wind River Systems, Inc. and others. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.tcf.core.scripting.parser;
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 java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.core.runtime.Assert;
import org.eclipse.tcf.protocol.JSON;
/**
* Script parser implementation.
*/
public class Parser {
// Reference to the script to parse
private final String script;
// Define some patterns to match the lines against
private static final Pattern EMPTY_LINE = Pattern.compile("\\s*"); //$NON-NLS-1$
private static final Pattern COMMENT_LINE = Pattern.compile("\\s*#.*"); //$NON-NLS-1$
private static final Pattern CONNECT_LINE = Pattern.compile("\\s*connect\\s+.*"); //$NON-NLS-1$
private static final Pattern COMMAND_LINE = Pattern.compile("\\s*tcf\\s+(\\w+)\\s+(\\w+)(.*)"); //$NON-NLS-1$
/**
* Constructor.
*/
public Parser(String script) {
Assert.isNotNull(script);
this.script = script;
}
/**
* Parse the given script and returns the extracted command tokens.
*
* @return The list of command tokens found in the script, or an empty list.
* @throws IOException - if the script parsing fails.
*/
public Token[] parse() throws IOException {
List<Token> tokens = new ArrayList<Token>();
BufferedReader reader = new BufferedReader(new StringReader(script));
String line;
while ((line = reader.readLine()) != null) {
// All the following lines are ignored if matched
if (EMPTY_LINE.matcher(line).matches()) continue;
if (COMMENT_LINE.matcher(line).matches()) continue;
if (CONNECT_LINE.matcher(line).matches()) continue;
// If it is a command line, get the groups from it
Matcher matcher = COMMAND_LINE.matcher(line);
if (matcher.matches()) {
String serviceName = matcher.group(1).trim();
String commandName = matcher.group(2).trim();
String arguments = matcher.group(3);
// Create a new token
Token token = new Token();
token.setServiceName(serviceName);
token.setCommandName(commandName);
// Parse the arguments
parseArguments(token, arguments);
// Add the token to the list
tokens.add(token);
}
}
reader.close();
return tokens.toArray(new Token[tokens.size()]);
}
/**
* Parse the arguments string and add the extracted arguments
* to the given token.
*
* @param token The token. Must not be <code>null</code>.
* @param arguments The arguments string or <code>null</code>.
*/
protected void parseArguments(Token token, String arguments) {
Assert.isNotNull(token);
if (arguments == null || "".equals(arguments.trim())) { //$NON-NLS-1$
return;
}
// Tokenize by space, but do special handling for maps and lists
StringTokenizer tokenizer = new StringTokenizer(arguments, " "); //$NON-NLS-1$
while (tokenizer.hasMoreTokens()) {
String tok = tokenizer.nextToken();
if (tok == null || "".equals(tok.trim())) continue; //$NON-NLS-1$
if (tok.equals("null")) { //$NON-NLS-1$
token.addArgument(null);
continue;
}
if (tok.startsWith("\"")) { //$NON-NLS-1$
// String type
String fullTok = tok;
boolean complete = isComplete(fullTok, '"', '"');
while (!complete && tokenizer.hasMoreTokens()) {
fullTok = fullTok + " " + tokenizer.nextToken(); //$NON-NLS-1$
complete = isComplete(fullTok, '"', '"');
}
if (complete) {
fullTok = fullTok.trim();
if (fullTok.startsWith("\"")) fullTok = fullTok.substring(1); //$NON-NLS-1$
if (fullTok.endsWith("\"")) fullTok = fullTok.substring(0, fullTok.length() - 1); //$NON-NLS-1$
token.addArgument(fullTok);
continue;
}
}
if ("true".equalsIgnoreCase(tok) || "false".equalsIgnoreCase(tok)) { //$NON-NLS-1$ //$NON-NLS-2$
token.addArgument(Boolean.valueOf(tok));
continue;
}
try {
Integer i = Integer.decode(tok);
token.addArgument(i);
continue;
} catch (NumberFormatException e) { /* ignored on purpose */ }
try {
Long l = Long.decode(tok);
token.addArgument(l);
continue;
} catch (NumberFormatException e) { /* ignored on purpose */ }
try {
Float f = Float.valueOf(tok);
token.addArgument(f);
continue;
} catch (NumberFormatException e) { /* ignored on purpose */ }
try {
Double d = Double.valueOf(tok);
token.addArgument(d);
continue;
} catch (NumberFormatException e) { /* ignored on purpose */ }
// If it starts with '{' or '[', it's a map or list type
if (tok.startsWith("{")) { //$NON-NLS-1$
// Map type
String fullTok = tok;
boolean complete = isComplete(fullTok, '{', '}');
while (!complete && tokenizer.hasMoreTokens()) {
fullTok = fullTok + " " + tokenizer.nextToken(); //$NON-NLS-1$
complete = isComplete(fullTok, '{', '}');
}
if (complete) {
fullTok = fullTok + "\0"; //$NON-NLS-1$
try {
Object[] args = JSON.parseSequence(fullTok.getBytes());
if (args != null) {
for (Object arg : args) {
if (arg != null) token.addArgument(arg);
}
continue;
}
} catch (IOException e) { /* ignored on purpose */ e.printStackTrace(); }
}
}
if (tok.startsWith("[")) { //$NON-NLS-1$
// List type
String fullTok = tok;
boolean complete = isComplete(fullTok, '[', ']');
while (!complete && tokenizer.hasMoreTokens()) {
fullTok = fullTok + " " + tokenizer.nextToken(); //$NON-NLS-1$
complete = isComplete(fullTok, '[', ']');
}
if (complete) {
fullTok = fullTok + "\0"; //$NON-NLS-1$
try {
Object[] args = JSON.parseSequence(fullTok.getBytes());
if (args != null) {
for (Object arg : args) {
if (arg != null) token.addArgument(arg);
}
continue;
}
} catch (IOException e) { /* ignored on purpose */ }
}
}
// Add the argument token as is
token.addArgument(tok);
}
}
/**
* Counts the number of opening and closing characters inside the given
* string and returns <code>true</code> if the number matches.
*
* @param tok The arguments token. Must not be <code>null</code>.
* @param opening The opening character.
* @param closing The closing character.
*
* @return <code>True</code> if the number of opening characters matches the number of closing characters, <code>false</code> otherwise.
*/
protected boolean isComplete(String tok, char opening, char closing) {
Assert.isNotNull(tok);
int countOpening = 0;
int countClosing = 0;
boolean same = opening == closing;
for (int i = 0; i < tok.length(); i++) {
char c = tok.charAt(i);
if (c == opening && same) {
if (countOpening > countClosing) countClosing++;
else countOpening++;
} else {
if (c == opening) { countOpening++; continue; }
if (c == closing) { countClosing++; continue; }
}
}
return countOpening > 0 && countOpening == countClosing;
}
}
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