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package org.eclipse.cdt.internal.corext.template.c;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
import org.eclipse.cdt.core.model.ITranslationUnit;
import org.eclipse.cdt.internal.corext.util.CodeFormatterUtil;
import org.eclipse.cdt.internal.ui.util.Strings;
import org.eclipse.cdt.ui.CUIPlugin;
import org.eclipse.cdt.ui.PreferenceConstants;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.templates.Template;
import org.eclipse.jface.text.templates.TemplateBuffer;
import org.eclipse.jface.text.templates.TemplateContextType;
import org.eclipse.jface.text.templates.TemplateException;
import org.eclipse.jface.text.templates.TemplateTranslator;
/**
* A context for c/c++
*/
public class CContext extends TranslationUnitContext {
/** The platform default line delimiter. */
private static final String PLATFORM_LINE_DELIMITER= System.getProperty("line.separator"); //$NON-NLS-1$
/**
* Creates a javadoc template context.
*
* @param type the context type.
* @param string the document string.
* @param completionPosition the completion position within the document.
* @param unit the compilation unit (may be <code>null</code>).
*/
public CContext(TemplateContextType type, IDocument document, int completionOffset, int completionLength,
ITranslationUnit translationUnit) {
super(type, document, completionOffset, completionLength, translationUnit);
}
/*
* @see DocumentTemplateContext#getStart()
*/
public int getStart() {
try {
IDocument document= getDocument();
if (getCompletionLength() == 0) {
int start= getCompletionOffset();
while ((start != 0) && Character.isUnicodeIdentifierPart(document.getChar(start - 1)))
start--;
if ((start != 0) && Character.isUnicodeIdentifierStart(document.getChar(start - 1)))
start--;
return start;
}
int start= getCompletionOffset();
int end= getCompletionOffset() + getCompletionLength();
while (start != 0 && Character.isUnicodeIdentifierPart(document.getChar(start - 1))) {
start--;
}
while (start != end && Character.isWhitespace(document.getChar(start))) {
start++;
}
if (start == end) {
start= getCompletionOffset();
}
return start;
} catch (BadLocationException e) {
return super.getStart();
}
}
public int getEnd() {
if (getCompletionLength() == 0)
return super.getEnd();
try {
IDocument document= getDocument();
int start= getCompletionOffset();
int end= getCompletionOffset() + getCompletionLength();
while (start != end && Character.isWhitespace(document.getChar(end - 1))) {
end--;
}
return end;
} catch (BadLocationException e) {
return super.getEnd();
}
}
/*
* @see TemplateContext#canEvaluate(Template templates)
*/
public boolean canEvaluate(Template template) {
String key= getKey();
return template.matches(key, getContextType().getId())
&& key.length() != 0 && template.getName().toLowerCase().startsWith(key.toLowerCase());
//return template.matches(getKey(), getContextType().getName());
}
/*
* @see TemplateContext#evaluate(Template)
*/
public TemplateBuffer evaluate(Template template) throws BadLocationException, TemplateException {
if (!canEvaluate(template))
return null;
TemplateTranslator translator= new TemplateTranslator();
TemplateBuffer buffer= translator.translate(template.getPattern());
getContextType().resolve(buffer, this);
String lineDelimiter= null;
try {
lineDelimiter= getDocument().getLineDelimiter(0);
} catch (BadLocationException e) {
}
if (lineDelimiter == null) {
lineDelimiter= PLATFORM_LINE_DELIMITER;
}
IPreferenceStore prefs= CUIPlugin.getDefault().getPreferenceStore();
boolean useCodeFormatter= prefs.getBoolean(PreferenceConstants.TEMPLATES_USE_CODEFORMATTER);
CFormatter formatter= new CFormatter(lineDelimiter, getIndentation(), useCodeFormatter);
formatter.edit(buffer, this, getIndentation());
return buffer;
}
/**
* Returns the indentation level at the position of code completion.
*/
private int getIndentation() {
int start= getStart();
IDocument document= getDocument();
try {
IRegion region= document.getLineInformationOfOffset(start);
String lineContent= document.get(region.getOffset(), region.getLength());
return Strings.computeIndent(lineContent, CodeFormatterUtil.getTabWidth());
} catch (BadLocationException e) {
return 0;
}
}
}
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