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/*******************************************************************************
* Copyright (c) 2009 Red Hat 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:
* Alexander Kurtakov - initial API and implementation
*******************************************************************************/
package org.eclipse.dltk.sh.core.parser;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.HashSet;
import java.util.Set;
import java.util.Stack;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.dltk.ast.declarations.Declaration;
import org.eclipse.dltk.ast.declarations.FieldDeclaration;
import org.eclipse.dltk.ast.declarations.MethodDeclaration;
import org.eclipse.dltk.ast.declarations.ModuleDeclaration;
import org.eclipse.dltk.ast.expressions.MethodCallExpression;
import org.eclipse.dltk.ast.parser.AbstractSourceParser;
import org.eclipse.dltk.ast.parser.IModuleDeclaration;
import org.eclipse.dltk.ast.references.VariableReference;
import org.eclipse.dltk.compiler.env.IModuleSource;
import org.eclipse.dltk.compiler.problem.IProblemReporter;
public class ShellScriptSourceParser extends AbstractSourceParser {
private static ShellModel parse(StringReader reader, ShellModuleDeclaration moduleDeclaration) {
ShellModel model = new ShellModel();
String line;
int lineStart = 0;
int commentLength = 0;
Set<String> functionNames = new HashSet<>();
Set<String> varNames = new HashSet<>();
MethodDeclaration mDeclaration = null;
Stack<Declaration> tmp = new Stack<>();
boolean isPrevLnContinued = false;
try (BufferedReader bReader = new BufferedReader(reader)) {
while ((line = bReader.readLine()) != null) {
if (line.trim().length() == 0 || line.trim().charAt(0) == '#') {
lineStart += line.length() + 1;
continue;
}
if (line.contains("#")) {
commentLength = line.substring(line.indexOf('#')).length();
line = line.substring(0, line.indexOf('#'));
}
if (line.contains("()")) {
int lBracket = line.indexOf('{') == -1 ? 0 : line.indexOf('{');
int fPlusEight = line.indexOf("function") == -1 ? 0 : line.indexOf("function") + 8;
mDeclaration = new MethodDeclaration(line.substring(fPlusEight, line.indexOf('(')).trim(),
lineStart, lineStart + line.length() - 1, lBracket + lineStart, lBracket + lineStart);
functionNames.add(line.substring(fPlusEight, line.indexOf('(')).trim());
tmp.push(mDeclaration);
model.addFunction(mDeclaration);
} else if (line.contains("function ")) {
int fPlusEight = line.indexOf("function") + 8;
int lBracket = line.indexOf('{') == -1 ? line.length() : line.indexOf('{') - 1;
if (fPlusEight >= line.length()) {
continue;
}
if (fPlusEight > lBracket) {
continue;
}
mDeclaration = new MethodDeclaration(line.substring(fPlusEight, lBracket).trim(), lineStart,
lineStart + line.length() - 1, lBracket + lineStart, lBracket + lineStart);
functionNames.add(line.substring(fPlusEight, lBracket).trim());
tmp.push(mDeclaration);
model.addFunction(mDeclaration);
} else if (line.trim().equals("}")) {
if (mDeclaration != null) {
if (!tmp.isEmpty()) {
mDeclaration = (MethodDeclaration) tmp.pop();
mDeclaration.setEnd(lineStart + line.length());
}
}
}
Pattern assignmentPattern = Pattern.compile("(^|\\W)\\w*=");
Matcher matcher = assignmentPattern.matcher(line);
if (matcher.find()) {
String varName = line.substring(matcher.start(), matcher.end() - 1);
if (isValidName(varName)) {
FieldDeclaration variable = new FieldDeclaration(varName, lineStart + matcher.start(),
lineStart + matcher.end(), lineStart + matcher.start(), lineStart + matcher.end());
varNames.add(varName);
model.addVariable(variable);
}
}
// start of if statement
if (line.contains("if ") && !line.contains("elif ")) {
mDeclaration = new MethodDeclaration(line.substring(0, line.length()).trim(),
lineStart + line.indexOf("if"), lineStart + line.length() - 1, lineStart,
lineStart + line.length());
model.addStatement(mDeclaration);
tmp.push(mDeclaration);
// end of if statement
} else if (line.trim().equals("fi")) {
if (!tmp.isEmpty()) {
mDeclaration = (MethodDeclaration) tmp.pop();
mDeclaration.setEnd(lineStart + line.indexOf("fi"));
}
// start of while statement
} else if (line.contains("while ")) {
mDeclaration = new MethodDeclaration(line.substring(0, line.length()).trim(),
lineStart + line.indexOf("while"), lineStart + line.length() - 1, lineStart,
lineStart + line.length());
model.addStatement(mDeclaration);
tmp.push(mDeclaration);
// start of until statement
} else if (line.contains("until ")) {
mDeclaration = new MethodDeclaration(line.substring(0, line.length()).trim(),
lineStart + line.indexOf("until"), lineStart + line.length() - 1, lineStart,
lineStart + line.length());
model.addStatement(mDeclaration);
tmp.push(mDeclaration);
// done statement encountered
} else if (line.contains("done ") || line.trim().equals("done")) {
if (!tmp.isEmpty()) {
mDeclaration = (MethodDeclaration) tmp.pop();
mDeclaration.setEnd(lineStart + line.indexOf("done"));
}
// start of for statement
} else if (line.contains("for ")) {
mDeclaration = new MethodDeclaration(line.substring(0, line.length()).trim(),
lineStart + line.indexOf("for"), lineStart + line.length() - 1, lineStart,
lineStart + line.length());
model.addStatement(mDeclaration);
tmp.push(mDeclaration);
// start of case statement
} else if (line.contains("case ")) {
mDeclaration = new MethodDeclaration(line.substring(0, line.length()).trim(),
lineStart + line.indexOf("case"), lineStart + line.length() - 1, lineStart,
lineStart + line.length());
model.addStatement(mDeclaration);
tmp.push(mDeclaration);
// end of case statement
} else if (line.trim().equals("esac")) {
if (!tmp.isEmpty()) {
mDeclaration = (MethodDeclaration) tmp.pop();
mDeclaration.setEnd(lineStart + line.indexOf("esac"));
}
}
// multi-line commands and literals
if (line.charAt(line.length() - 1) == '\\' && !isPrevLnContinued) {
isPrevLnContinued = true;
mDeclaration = new MethodDeclaration(line.substring(0, line.length()).trim(),
lineStart + line.indexOf('\\'), lineStart + line.length() - 1, lineStart,
lineStart + line.length());
tmp.push(mDeclaration);
model.addStatement(mDeclaration);
} else if (line.charAt(line.length() - 1) == '\\' && isPrevLnContinued) {
if (!tmp.isEmpty()) {
mDeclaration = (MethodDeclaration) tmp.pop();
mDeclaration.setEnd(lineStart + line.indexOf('\\'));
tmp.push(mDeclaration);
}
} else if (isPrevLnContinued) {
isPrevLnContinued = false;
if (!tmp.isEmpty()) {
mDeclaration = (MethodDeclaration) tmp.pop();
mDeclaration.setEnd(lineStart + line.length() - 2);
}
}
for (String funcName : functionNames) {
if (line.contains(funcName)) {
moduleDeclaration.addStatement(new MethodCallExpression(lineStart + line.indexOf(funcName),
lineStart + line.indexOf(funcName) + funcName.length(), null, funcName, null));
}
}
for (String varName : varNames) {
Pattern varRefPattern = Pattern.compile("(^|\\W)\\$\\b" + varName + "\\b");
Matcher varRefMatcher = varRefPattern.matcher(line);
while (varRefMatcher.find()) {
moduleDeclaration.addStatement(new VariableReference(lineStart + varRefMatcher.start(),
lineStart + varRefMatcher.end(), varName));
}
}
lineStart += line.length() + commentLength + 1;
commentLength = 0;
}
bReader.close();
} catch (IOException e) {
e.printStackTrace();
}
return model;
}
private static boolean isValidName(String varName) {
if (varName.matches("\\w+")) {
return true;
}
return false;
}
private static void processNode(ShellModel parse, ModuleDeclaration moduleDeclaration) {
for (MethodDeclaration functionNode : parse.getFunctions()) {
moduleDeclaration.addStatement(functionNode);
}
for (FieldDeclaration variableNode : parse.getVariables()) {
moduleDeclaration.addStatement(variableNode);
}
for (MethodDeclaration statement : parse.getStatements()) {
moduleDeclaration.addStatement(statement);
}
}
@Override
public IModuleDeclaration parse(IModuleSource source, IProblemReporter arg1) {
ShellModuleDeclaration moduleDeclaration = new ShellModuleDeclaration(source.getSourceContents().length());
ShellModel shellModel = parse(new StringReader(source.getSourceContents()), moduleDeclaration);
moduleDeclaration.setFunctions(shellModel.getFunctions());
moduleDeclaration.setVariables(shellModel.getVariables());
processNode(shellModel, moduleDeclaration);
return moduleDeclaration;
}
}
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