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/*
* Copyright 2000-2014 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.psi.codeStyle.autodetect;
import com.intellij.util.containers.ContainerUtil;
import com.intellij.util.text.CharArrayUtil;
import org.jetbrains.annotations.NotNull;
import java.util.List;
public class LineIndentInfoBuilder {
private static final int MAX_LINES_TO_PROCESS = 500;
private final CharSequence myText;
private final int myLength;
public LineIndentInfoBuilder(@NotNull CharSequence text) {
myText = text;
myLength = text.length();
}
@NotNull
public List<LineIndentInfo> build() {
List<LineIndentInfo> lineIndentInfos = ContainerUtil.newArrayList();
int lineStartOffset = 0;
int currentLine = 0;
while (lineStartOffset < myText.length() && currentLine < MAX_LINES_TO_PROCESS) {
int lineEndOffset = getLineEndOffset(lineStartOffset);
int textStartOffset = CharArrayUtil.shiftForward(myText, lineStartOffset, lineEndOffset, " \t");
if (textStartOffset != lineEndOffset) {
lineIndentInfos.add(createInfoFromWhiteSpaceRange(lineStartOffset, textStartOffset));
} else {
lineIndentInfos.add(LineIndentInfo.EMPTY_LINE);
}
lineStartOffset = lineEndOffset + 1;
currentLine++;
}
return lineIndentInfos;
}
@NotNull
private LineIndentInfo createInfoFromWhiteSpaceRange(int lineStartOffset, int textStartOffset) {
if (myText.charAt(textStartOffset) == '*') {
return LineIndentInfo.LINE_WITH_COMMENT;
}
else if (CharArrayUtil.indexOf(myText, "\t", lineStartOffset, textStartOffset) > 0) {
return LineIndentInfo.LINE_WITH_TABS;
}
else {
int indentSize = textStartOffset - lineStartOffset;
return LineIndentInfo.newWhiteSpaceIndent(indentSize);
}
}
private int getLineEndOffset(int lineStartOffset) {
int lineEndOffset = CharArrayUtil.indexOf(myText, "\n", lineStartOffset, myLength);
if (lineEndOffset < 0) {
lineEndOffset = myText.length();
}
return lineEndOffset;
}
}
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