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/*
* Copyright 2000-2011 JetBrains s.r.o.
*
* 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.intellij.openapi.editor.impl.softwrap.mapping;
import com.intellij.openapi.editor.*;
import com.intellij.openapi.editor.impl.EditorTextRepresentationHelper;
import com.intellij.openapi.editor.impl.softwrap.SoftWrapsStorage;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Collections;
import java.util.List;
/**
* @author Denis Zhdanov
* @since Sep 9, 2010 9:20:44 AM
*/
class VisualToLogicalCalculationStrategy extends AbstractMappingStrategy<LogicalPosition> {
private final CacheEntry mySearchKey;
private VisualPosition myTargetVisual;
VisualToLogicalCalculationStrategy(@NotNull Editor editor, @NotNull SoftWrapsStorage storage, @NotNull List<CacheEntry> cache,
@NotNull EditorTextRepresentationHelper representationHelper)
{
super(editor, storage, cache, representationHelper);
mySearchKey = new CacheEntry(0, editor, representationHelper);
}
public void init(@NotNull final VisualPosition targetVisual, @NotNull final List<CacheEntry> cache) {
reset();
myTargetVisual = targetVisual;
mySearchKey.visualLine = targetVisual.line;
int i = Collections.binarySearch(cache, mySearchKey);
if (i >= 0) {
CacheEntry cacheEntry = cache.get(i);
if (cacheEntry.visualLine == targetVisual.line) {
if (targetVisual.column == 0) {
setEagerMatch(cacheEntry.buildStartLinePosition().buildLogicalPosition());
}
else if (targetVisual.column == cacheEntry.endVisualColumn) {
setEagerMatch(cacheEntry.buildEndLinePosition().buildLogicalPosition());
}
else if (targetVisual.column > cacheEntry.endVisualColumn) {
EditorPosition position = cacheEntry.buildEndLinePosition();
int columnsDiff = targetVisual.column - cacheEntry.endVisualColumn;
position.visualColumn += columnsDiff;
if (myStorage.getSoftWrap(cacheEntry.endOffset) == null) {
position.logicalColumn += columnsDiff;
}
else {
position.softWrapColumnDiff += columnsDiff;
}
setEagerMatch(position.buildLogicalPosition());
}
else {
setTargetEntry(cacheEntry, true);
}
}
else {
setInitialPosition(cacheEntry.buildStartLinePosition());
}
return;
}
i = -i - 1;
if (i > 0 && i <= cache.size()) {
CacheEntry entry = cache.get(i - 1);
EditorPosition position = entry.buildEndLinePosition();
position.onNewLine(true);
setInitialPosition(position);
}
else {
setFirstInitialPosition();
}
}
@Override
protected LogicalPosition buildIfExceeds(EditorPosition position, int offset) {
Document document = myEditor.getDocument();
// There is a possible case that target visual line starts with soft wrap. We want to process that at 'processSoftWrap()' method.
CacheEntry targetEntry = getTargetEntry();
if (targetEntry != null && targetEntry.startOffset == offset && myStorage.getSoftWrap(offset) != null) {
return null;
}
int i = MappingUtil.getCacheEntryIndexForOffset(offset, document, myCache);
if (i < 0) {
return null;
}
CacheEntry cacheEntry = myCache.get(i);
if (cacheEntry.visualLine < myTargetVisual.line) {
return null;
}
// Return eagerly if target visual position remains between current context position and the one defined by the given offset.
if (offset < cacheEntry.startOffset || myTargetVisual.line < cacheEntry.visualLine
|| (position.visualColumn + offset - position.offset >= myTargetVisual.column))
{
int linesDiff = myTargetVisual.line - position.visualLine;
if (linesDiff > 0) {
position.logicalColumn = myTargetVisual.column;
position.offset = document.getLineStartOffset(position.logicalLine + linesDiff);
position.offset += myTargetVisual.column;
}
else {
int columnsDiff = myTargetVisual.column - position.visualColumn;
position.logicalColumn += columnsDiff;
position.offset += columnsDiff;
}
// There is a possible case that target visual position points to virtual space after line end. We need
// to define correct offset then
position.offset = Math.min(position.offset, document.getLineEndOffset(position.logicalLine));
position.visualLine += linesDiff;
position.visualColumn = myTargetVisual.column;
position.logicalLine += linesDiff;
return position.buildLogicalPosition();
}
return null;
}
@Nullable
@Override
public LogicalPosition processSoftWrap(@NotNull EditorPosition position, SoftWrap softWrap) {
// There is a possible case that current visual line starts with soft wrap and target visual position points to its
// virtual space.
CacheEntry targetEntry = getTargetEntry();
if (targetEntry != null && targetEntry.startOffset == softWrap.getStart()) {
if (myTargetVisual.column <= softWrap.getIndentInColumns()) {
EditorPosition resultingContext = targetEntry.buildStartLinePosition();
resultingContext.visualColumn = myTargetVisual.column;
resultingContext.softWrapColumnDiff += myTargetVisual.column;
return resultingContext.buildLogicalPosition();
}
else {
position.visualColumn = softWrap.getIndentInColumns();
position.softWrapColumnDiff += softWrap.getIndentInColumns();
return null;
}
}
return null;
}
@Override
protected LogicalPosition buildIfExceeds(@NotNull EditorPosition context, @NotNull FoldRegion foldRegion) {
// We assume that fold region placeholder contains only 'simple' symbols, i.e. symbols that occupy single visual column.
String placeholder = foldRegion.getPlaceholderText();
// Check if target visual position points inside collapsed fold region placeholder
if (myTargetVisual.column < /* note that we don't use <= here */ context.visualColumn + placeholder.length()) {
// Map all visual positions that point inside collapsed fold region as the logical position of it's start.
return context.buildLogicalPosition();
}
return null;
}
@Override
protected LogicalPosition buildIfExceeds(EditorPosition context, TabData tabData) {
if (context.visualColumn + tabData.widthInColumns >= myTargetVisual.column) {
context.logicalColumn += myTargetVisual.column - context.visualColumn;
context.visualColumn = myTargetVisual.column;
return context.buildLogicalPosition();
}
return null;
}
@NotNull
@Override
public LogicalPosition build(@NotNull EditorPosition position) {
int linesDiff = myTargetVisual.line - position.visualLine;
if (linesDiff <= 0) {
int columnsDiff = myTargetVisual.column - position.visualColumn;
position.logicalColumn += columnsDiff;
position.offset += columnsDiff;
}
else {
position.logicalLine += linesDiff;
position.visualLine += linesDiff;
Document document = myEditor.getDocument();
if (document.getLineCount() <= position.logicalLine) {
position.offset = Math.max(0, document.getTextLength() - 1);
}
else {
int startLineOffset = document.getLineStartOffset(position.logicalLine);
position.offset = startLineOffset + myTargetVisual.column;
}
position.logicalColumn = myTargetVisual.column;
}
position.visualColumn = myTargetVisual.column;
return position.buildLogicalPosition();
}
}
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