/*******************************************************************************
* Copyright (c) 2007, 2017 Red Hat, Inc.
* 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:
* Red Hat - initial API and implementation
* Alphonse Van Assche
*******************************************************************************/
package org.eclipse.linuxtools.internal.rpm.ui.editor;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DefaultInformationControl;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IInformationControlCreator;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextHover;
import org.eclipse.jface.text.ITextHoverExtension;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
import org.eclipse.linuxtools.rpm.ui.editor.parser.Specfile;
import org.eclipse.linuxtools.rpm.ui.editor.parser.SpecfileDefine;
import org.eclipse.linuxtools.rpm.ui.editor.parser.SpecfileParser;
import org.eclipse.swt.graphics.Point;
public class SpecfileHover implements ITextHover, ITextHoverExtension {
@Override
public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
if (hoverRegion == null || hoverRegion.getLength() == 0) {
return null;
}
Specfile spec = new SpecfileParser().parse(textViewer.getDocument());
String currentSelection;
try {
currentSelection = textViewer.getDocument().get(hoverRegion.getOffset() + 1, hoverRegion.getLength() - 1);
} catch (BadLocationException e) {
return null;
}
// First we try to get a define based on the given name
SpecfileDefine define = spec.getDefine(currentSelection);
String value = currentSelection + ": "; //$NON-NLS-1$
if (define != null) {
return value + define.getStringValue();
}
String macroLower = currentSelection.toLowerCase();
// If there's no such define we try to see if it corresponds to
// a Source or Patch declaration
String retrivedValue = RPMUtils.getSourceOrPatchValue(spec, macroLower);
if (retrivedValue != null) {
return value + retrivedValue;
} else {
// If it does not correspond to a Patch or Source macro, try to find
// it
// in the macro proposals list.
retrivedValue = RPMUtils.getMacroValueFromMacroList(currentSelection);
if (retrivedValue != null) {
return value + retrivedValue;
} else {
// If it does not correspond to a macro in the list, try to find
// it
// in the RPM list.
retrivedValue = Activator.getDefault().getRpmPackageList()
.getValue(currentSelection.replaceFirst(":", "")); //$NON-NLS-1$ //$NON-NLS-2$
if (retrivedValue != null) {
return retrivedValue;
}
}
}
// We return null in other cases, so we don't show hover information
// for unrecognized macros and RPM packages.
return null;
}
@Override
public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
if (textViewer != null) {
/*
* If the hover offset falls within the selection range return the
* region for the whole selection.
*/
Point selectedRange = textViewer.getSelectedRange();
if (selectedRange.x >= 0 && selectedRange.y > 0 && offset >= selectedRange.x
&& offset <= selectedRange.x + selectedRange.y) {
return new Region(selectedRange.x, selectedRange.y);
} else {
IRegion region = findWord(textViewer.getDocument(), offset);
if (region.equals(new Region(offset, 0))) {
region = findPackages(textViewer.getDocument(), offset);
}
return region;
}
}
return null;
}
@Override
public IInformationControlCreator getHoverControlCreator() {
return parent -> new DefaultInformationControl(parent, false);
}
public static IRegion findWord(IDocument document, int offset) {
int start = -1;
int end = -1;
boolean beginsWithBrace = false;
try {
int pos = offset;
char c;
while (pos >= 0) {
c = document.getChar(pos);
if (c == '%') {
if (document.getChar(pos + 1) == '{') {
beginsWithBrace = true;
}
break;
} else if (c == '\n' || c == '}') {
// if we hit the beginning of the line, it's not a macro
return new Region(offset, 0);
}
--pos;
}
if (!beginsWithBrace) {
--pos;
}
start = pos;
pos = offset;
int length = document.getLength();
while (pos < length) {
c = document.getChar(pos);
if (beginsWithBrace && (c == '}')) {
break;
} else if (c == '\n' || c == '%' || c == '(') { // '(' is needed
// for the
// %deffatt(
// case
break;
// Do not return empty region here. We have a work.
// return new Region(offset, 0);
} else if (!beginsWithBrace && c == ' ') {
break;
}
++pos;
}
end = pos;
} catch (BadLocationException x) {
}
if (start >= -1 && end > -1) {
if (start == offset) {
return new Region(start, end - start);
} else {
return new Region(start + 1, end - start - 1);
}
}
return null;
}
public static IRegion findPackages(IDocument document, int offset) {
int start = -1;
int end = -1;
boolean beginsWithSpace = false;
try {
int pos = offset;
char c;
while (pos >= 0) {
c = document.getChar(pos);
if (c == ' ' || c == '\t' || c == ':') {
if (Character.isLetter(document.getChar(pos + 1))) {
beginsWithSpace = true;
break;
} else if (c == '\n') {
return new Region(offset, 0);
}
}
--pos;
}
--pos;
start = pos;
pos = offset;
int length = document.getLength();
while (pos < length) {
c = document.getChar(pos);
if (beginsWithSpace && (!Character.isLetter(c) && !Character.isDigit(c) && c != '-')) {
break;
} else if (c == '\n') {
return new Region(offset, 0);
}
++pos;
}
end = pos;
} catch (BadLocationException x) {
}
if (start > -1 && end > -1) {
return new Region(start, end - start);
}
return null;
}
}