From de144ef6a0978e8771be6cfef7f9185ed51be295 Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Fri, 14 Jun 2019 20:40:28 +0200
Subject: [PATCH] WordCompletionContributor: don't fail when invoked before
 literal value start (EA-144730) and don't allocate huge strings

GitOrigin-RevId: f09241ba70c15877a7aa3e15267ebbe8baa99eae
---
 .../codeInsight/completion/WordCompletionContributor.java  | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/platform/lang-impl/src/com/intellij/codeInsight/completion/WordCompletionContributor.java b/platform/lang-impl/src/com/intellij/codeInsight/completion/WordCompletionContributor.java
index 580e4932cdd0..164ac1551d49 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/completion/WordCompletionContributor.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/completion/WordCompletionContributor.java
@@ -100,9 +100,12 @@ public class WordCompletionContributor extends CompletionContributor implements
     if (manipulator == null) {
       return;
     }
-    int offset = manipulator.getRangeInElement(localString).getStartOffset();
+    int valueStart = manipulator.getRangeInElement(localString).getStartOffset() + localString.getTextRange().getStartOffset();
+    if (valueStart > parameters.getOffset()) {
+      return;
+    }
     PsiFile file = position.getContainingFile();
-    String prefix = file.getText().substring(offset + localString.getTextRange().getStartOffset(), parameters.getOffset());
+    String prefix = file.getViewProvider().getContents().subSequence(valueStart, parameters.getOffset()).toString();
     CompletionResultSet fullStringResult = result.withPrefixMatcher(new PlainPrefixMatcher(prefix));
     file.accept(new PsiRecursiveElementWalkingVisitor() {
       @Override