// Copyright 2012 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.collide.client.syntaxhighlighter;
import com.google.collide.client.editor.Editor;
import com.google.collide.client.editor.Editor.Css;
import com.google.collide.client.editor.renderer.LineRenderer;
import com.google.collide.client.editor.selection.SelectionModel;
import com.google.collide.codemirror2.Token;
import com.google.collide.json.shared.JsonArray;
import com.google.collide.shared.document.Line;
import com.google.common.base.Preconditions;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.CssResource;
/**
* A {@link LineRenderer} to render the syntax highlighting.
*
*/
public class SyntaxHighlighterRenderer implements LineRenderer {
/**
* ClientBundle for the syntax highlighter renderer.
*/
public interface Resources extends ClientBundle {
@Source("SyntaxHighlighterRenderer.css")
CssResource syntaxHighlighterRendererCss();
}
private final SelectionModel selection;
private final SyntaxHighlighter syntaxHighlighter;
private JsonArray<Token> tokens;
private int tokenPos;
private final Css editorCss;
SyntaxHighlighterRenderer(
SyntaxHighlighter syntaxHighlighter, SelectionModel selection, Editor.Css editorCss) {
this.syntaxHighlighter = syntaxHighlighter;
this.selection = selection;
this.editorCss = editorCss;
}
@Override
public void renderNextChunk(Target target) {
Token token = tokens.get(tokenPos++);
Preconditions.checkNotNull(token, "Token was null");
String tokenValue = token.getValue();
String style = "";
switch (token.getType()) {
case NEWLINE:
// we special case the NEWLINE token and do not append the default style.
style = null;
break;
case ERROR:
style = editorCss.lineRendererError() + " ";
// Fall through to add the external stable class name too (unofficial color API)
default:
style += token.getStyle();
}
target.render(tokenValue.length(), style);
}
@Override
public boolean resetToBeginningOfLine(Line line, int lineNumber) {
tokens = syntaxHighlighter.getTokens(line);
tokenPos = 0;
// If we failed to get any tokens, don't try to render this line
return tokens != null;
}
@Override
public boolean shouldLastChunkFillToRight() {
return false;
}
}