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Some optimization

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This commit is contained in:
Rustam Vishnyakov
2016-05-19 15:17:41 +03:00
parent 7f274c039e
commit 1c7ab68872
1 changed files with 12 additions and 2 deletions
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platform/lang-impl/src/com/intellij/application/options/ChangesDiffCalculator.java
+12 -2
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@@ -25,6 +25,7 @@ import com.intellij.openapi.editor.Document;
import com.intellij.openapi.progress.DumbProgressIndicator;
import com.intellij.openapi.util.TextRange;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.util.text.CharArrayUtil;
import org.jetbrains.annotations.NotNull;
import java.util.ArrayList;
@@ -88,14 +89,23 @@ public class ChangesDiffCalculator {
return new TextRange(startOffset, startOffset);
}
CharSequence originalSequence = text.subSequence(startOffset, endOffset);
int originalStartOffset = startOffset;
int originalEndOffset = endOffset;
while (endOffset < text.length() &&
StringUtil.equals(originalSequence, text.subSequence(startOffset + 1, endOffset + 1))) {
rangesEqual(text, originalStartOffset, originalEndOffset, startOffset + 1, endOffset + 1)) {
startOffset++;
endOffset++;
}
return new TextRange(startOffset, endOffset);
}
private static boolean rangesEqual(@NotNull CharSequence text, int start1, int end1, int start2, int end2) {
if (end1 - start1 != end2 - start2) return false;
for (int i = start1; i < end1; i++) {
if (text.charAt(i) != text.charAt(i - start1 + start2)) return false;
}
return true;
}
}