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Do not scan file for changed range if we already know it exactly

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This commit is contained in:
Alexey Gopachenko
2017-09-25 16:09:39 +02:00
parent 79387e4b2d
commit 42c6cecd47
1 changed files with 13 additions and 5 deletions
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platform/core-impl/src/com/intellij/psi/impl/DocumentCommitThread.java
+13 -5
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@@ -1,5 +1,5 @@
/*
* Copyright 2000-2016 JetBrains s.r.o.
* Copyright 2000-2017 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.
@@ -23,6 +23,7 @@ import com.intellij.openapi.application.ex.ApplicationEx;
import com.intellij.openapi.components.ServiceManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.event.DocumentEvent;
import com.intellij.openapi.editor.ex.DocumentEx;
import com.intellij.openapi.progress.ProcessCanceledException;
import com.intellij.openapi.progress.ProgressIndicator;
@@ -737,7 +738,7 @@ public class DocumentCommitThread implements Runnable, Disposable, DocumentCommi
@NotNull final FileASTNode oldFileNode) {
Document document = task.getDocument();
final CharSequence newDocumentText = document.getImmutableCharSequence();
final TextRange changedPsiRange = getChangedPsiRange(file, task.myLastCommittedText, newDocumentText);
final TextRange changedPsiRange = getChangedPsiRange(file, task.myLastCommittedText, task.reason, newDocumentText);
if (changedPsiRange == null) {
return null;
}
@@ -836,18 +837,25 @@ public class DocumentCommitThread implements Runnable, Disposable, DocumentCommi
@Nullable
private static TextRange getChangedPsiRange(@NotNull PsiFile file,
@NotNull CharSequence oldDocumentText,
@NotNull CharSequence newDocumentText) {
Object reason, @NotNull CharSequence newDocumentText) {
int psiLength = oldDocumentText.length();
if (!file.getViewProvider().supportsIncrementalReparse(file.getLanguage())) {
return new TextRange(0, psiLength);
}
int commonPrefixLength = StringUtil.commonPrefixLength(oldDocumentText, newDocumentText);
int commonPrefixLength;
commonPrefixLength = reason instanceof DocumentEvent
? ((DocumentEvent)reason).getOffset()
: StringUtil.commonPrefixLength(oldDocumentText, newDocumentText);
if (commonPrefixLength == newDocumentText.length() && newDocumentText.length() == psiLength) {
return null;
}
int commonSuffixLength = Math.min(StringUtil.commonSuffixLength(oldDocumentText, newDocumentText), psiLength - commonPrefixLength);
int commonSuffixLength;
commonSuffixLength = reason instanceof DocumentEvent
? newDocumentText.length() - commonPrefixLength - ((DocumentEvent)reason).getNewLength()
: StringUtil.commonSuffixLength(oldDocumentText, newDocumentText);
commonSuffixLength = Math.min(commonSuffixLength, psiLength - commonPrefixLength);
return new TextRange(commonPrefixLength, psiLength - commonSuffixLength);
}