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/*******************************************************************************
* Copyright (c) 2005, 2007 committers of openArchitectureWare 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:
* committers of openArchitectureWare - initial API and implementation
*******************************************************************************/
package org.eclipse.internal.xpand2.codeassist;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.internal.xtend.expression.codeassist.ProposalComputer;
import org.eclipse.internal.xtend.expression.codeassist.ProposalFactory;
import org.eclipse.xtend.expression.ExecutionContext;
public class StatementProposalComputer implements ProposalComputer {
public List<Object> computeProposals(final String txt, final ExecutionContext ctx, final ProposalFactory factory) {
final List<Object> result = new ArrayList<Object>();
final String prefix = "";
final String ws = findTrailingWhitespace(txt);
final Stack<StackElement> s = FastAnalyzer.computeStack(txt);
if (s.size() > 0) {
final StackElement se = s.peek();
result.add(factory.createStatementProposal(XpandTokens.LT + "END" + se.block + XpandTokens.RT, "END"
+ se.block, prefix));
if (contains(XpandTokens.IF, s)) {
result.add(factory.createStatementProposal(XpandTokens.LT + "ELSE" + XpandTokens.RT, "ELSE", prefix));
result.add(factory.createStatementProposal(XpandTokens.LT + "ELSEIF statement" + XpandTokens.RT,
"ELSEIF", prefix));
}
if (!contains(XpandTokens.FILE, s)) {
result.add(fileBlockProposal(ws, factory));
}
if (!contains(XpandTokens.PROTECT, s)) {
result.add(protectBlockProposal(ws, factory));
}
result.add(foreachBlockProposal(ws, factory));
result.add(ifBlockProposal(ws, factory));
result.add(letBlockProposal(ws, factory));
result.add(expandStatementProposal(ws, factory));
result.add(remBlockProposal(ws, factory));
} else {
if (txt.indexOf(XpandTokens.LT + XpandTokens.DEFINE) == -1) {
if (txt.indexOf(XpandTokens.LT + XpandTokens.EXTENSION) == -1) {
result.add(importStatementProposal(factory));
}
result.add(extensionStatementProposal(factory));
}
result.add(defineBlockProposal(ws, factory));
result.add(aroundBlockProposal(ws, factory));
result.add(remBlockProposal(ws, factory));
}
return result;
}
private Object importStatementProposal(final ProposalFactory factory) {
final String insertString = XpandTokens.LT + XpandTokens.IMPORT + " my::imported::namespace" + XpandTokens.RT;
return factory.createStatementProposal(insertString, "IMPORT statement", "", insertString
.indexOf("my::imported::namespace"), "my::imported::namespace".length());
}
private Object extensionStatementProposal(final ProposalFactory factory) {
final String insertString = XpandTokens.LT + XpandTokens.EXTENSION + " path::to::AbstractExtension"
+ XpandTokens.RT;
return factory.createStatementProposal(insertString, "EXTENSION statement", "", insertString
.indexOf("path::to::AbstractExtension"), "path::to::AbstractExtension".length());
}
private final static Pattern WS_PATTERN = Pattern.compile("(\\n?[\\t ]*)\\z");
private String findTrailingWhitespace(final String txt) {
final Matcher m = StatementProposalComputer.WS_PATTERN.matcher(txt);
m.find();
return m.group(1);
}
private Object expandStatementProposal(final String ws, final ProposalFactory factory) {
final String insertString = XpandTokens.LT + "EXPAND definition FOR this" + XpandTokens.RT;
return factory.createStatementProposal(insertString, "EXPAND statement", "",
insertString.indexOf("definition"), "definition".length());
}
private Object letBlockProposal(final String ws, final ProposalFactory factory) {
final String insertString = XpandTokens.LT + "LET expression AS e" + XpandTokens.RT + ws + XpandTokens.LT
+ "ENDLET" + XpandTokens.RT;
return factory.createStatementProposal(insertString, "LET block", "", insertString.indexOf("expression"),
"expression".length());
}
private Object ifBlockProposal(final String ws, final ProposalFactory factory) {
final String insertString = XpandTokens.LT + "IF condition" + XpandTokens.RT + ws + XpandTokens.LT + "ENDIF"
+ XpandTokens.RT;
return factory.createStatementProposal(insertString, "IF block", "", insertString.indexOf("condition"),
"condition".length());
}
private Object foreachBlockProposal(final String ws, final ProposalFactory factory) {
final String insertString = XpandTokens.LT + "FOREACH elements AS e" + XpandTokens.RT + ws + XpandTokens.LT
+ "ENDFOREACH" + XpandTokens.RT;
return factory.createStatementProposal(insertString, "FOREACH block", "", insertString.indexOf("elements"),
"elements".length());
}
private Object protectBlockProposal(final String ws, final ProposalFactory factory) {
final String insertString = XpandTokens.LT + "PROTECT CSTART '/*' CEND '*/' ID uniqueId"
+ XpandTokens.RT + ws + XpandTokens.LT + "ENDPROTECT" + XpandTokens.RT;
return factory.createStatementProposal(insertString, "PROTECT region", "", insertString.indexOf("uniqueId"),
"uniqueId".length());
}
private Object fileBlockProposal(final String ws, final ProposalFactory factory) {
final String insertString = XpandTokens.LT + "FILE fileName" + XpandTokens.RT + ws + XpandTokens.LT + "ENDFILE"
+ XpandTokens.RT;
return factory.createStatementProposal(insertString, "FILE block", "", insertString.indexOf("fileName"),
"fileName".length());
}
private Object defineBlockProposal(final String ws, final ProposalFactory factory) {
final String insertString = XpandTokens.LT + "DEFINE definionName FOR Type" + XpandTokens.RT + ws
+ XpandTokens.LT + "ENDDEFINE" + XpandTokens.RT;
return factory.createStatementProposal(insertString, "new DEFINE", "", insertString.indexOf("definionName"),
"definionName".length());
}
private Object aroundBlockProposal(final String ws, final ProposalFactory factory) {
final String insertString = XpandTokens.LT + "AROUND fullyQualifiedDefinionName FOR Type" + XpandTokens.RT + ws
+ XpandTokens.LT + "ENDAROUND" + XpandTokens.RT;
return factory.createStatementProposal(insertString, "new AROUND", "", insertString
.indexOf("fullyQualifiedDefinionName"), "fullyQualifiedDefinionName".length());
}
/**
* Creates a proposal for a REM block
*
* @param ws
* @param factory
* @return
* @since 4.2
*/
private Object remBlockProposal(final String ws, final ProposalFactory factory) {
final String blockContent = "comment";
final String insertString = XpandTokens.LT + "REM" + XpandTokens.RT + blockContent + XpandTokens.LT + "ENDREM"
+ XpandTokens.RT;
return factory.createStatementProposal(insertString, "REM block", "", insertString.indexOf(blockContent),
blockContent.length());
}
private boolean contains(final String blockName, final Stack<StackElement> s) {
for (StackElement element : s) {
if (element.block.equals(blockName)) {
return true;
}
}
return false;
}
protected String findPrefix(final String txt) {
final StringBuffer result = new StringBuffer();
int i = txt.length() - 1;
char c = txt.charAt(i);
while (i > 0 && Character.isJavaIdentifierStart(c)) {
result.append(c);
c = txt.charAt(--i);
}
return result.reverse().toString();
}
}
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