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UnifiedDiffParserException: expected file start line not found occurred when parse one Git format patch file #84

Closed
@HuGanghui

Description

@HuGanghui

Describe the bug
UnifiedDiffParserException: expected file start line not found occured when parse one Git format patch file

To Reproduce
Steps to reproduce the behavior:

  1. Example data
  2. simple programm snippet
  3. See error

the git format patch file is here:

From b53e612a2ab5ff15d14860e252f84c0f343fe93a Mon Sep 17 00:00:00 2001From: nmancus1 <nmancus1Date: Thu, 4 Jun 2020 11:46:34 -0400Subject: [PATCH] minor: Add input file for Java14 instanceof with pattern matching (#7290)--- config/ant-phase-verify.xml                        |  2 + .../InputJava14InstanceofWithPatternMatching.java  | 76 ++++++++++++++++++++++ 2 files changed, 78 insertions(+) create mode 100644 src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/java14/InputJava14InstanceofWithPatternMatching.javadiff --git a/config/ant-phase-verify.xml b/config/ant-phase-verify.xmlindex d27ffef..e0285ce 100644--- a/config/ant-phase-verify.xml+++ b/config/ant-phase-verify.xml@@ -148,6 +148,8 @@          <exclude name="**/InputMainFrameModelIncorrectClass.java"/>          <exclude name="**/InputBeforeExecutionExclusionFileFilterIncorrectClass.java"/>          <exclude name="**/InputJavaParser.java"/>+         <!-- until https://github.com/checkstyle/checkstyle/issues/7290 -->+         <exclude name="**/InputJava14InstanceofWithPatternMatching.java"/>          <!-- Cannot parse until Java 14 support -->          <exclude name="**/InputJava14Records.java"/>         </fileset>diff --git a/src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/java14/InputJava14InstanceofWithPatternMatching.java b/src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/java14/InputJava14InstanceofWithPatternMatching.javanew file mode 100644index 0000000..8fa3eba--- /dev/null+++ b/src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/java14/InputJava14InstanceofWithPatternMatching.java@@ -0,0 +1,76 @@+//non-compiled with javac: Compilable with Java14+package com.puppycrawl.tools.checkstyle.grammar.java14;++import java.util.Arrays;+import java.util.Locale;...... I removed it+        }+    }+}--2.7.4

when I run the follow codes, the exception happened inUnifiedDiffReader.parseUnifiedDiff

finalStringfullFileName =getPath(fileName);finalFileInputStreamins =newFileInputStream(fullFileName);returnUnifiedDiffReader.parseUnifiedDiff(ins);

error information:

com.github.difflib.unifieddiff.UnifiedDiffParserException: expected file start line not foundat com.github.difflib.unifieddiff.UnifiedDiffReader.parse(UnifiedDiffReader.java:90)at com.github.difflib.unifieddiff.UnifiedDiffReader.parseUnifiedDiff(UnifiedDiffReader.java:136)at com.github.checkstyle.patchfilter.SuppressionPatchFilterTest.getUnifiedDiff(SuppressionPatchFilterTest.java:232)at com.github.checkstyle.patchfilter.SuppressionPatchFilterTest.testGitFormatPatchLinuxTwo(SuppressionPatchFilterTest.java:151)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Expected behavior
A clear and concise description of what you expected to happen.

I hope to parse this file correctly.
System

  • Java version 1.8
  • Version [e.g. 22]
    Maven plugin
  <groupId>io.github.java-diff-utils</groupId>  <artifactId>java-diff-utils</artifactId>  <version>4.5</version>

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