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isDependencyChanged: consider equal timestamps as out of date 

Some systems have low-granularity timestamps, so that file modification
dates are rounded to seconds. This causes false negatives when detecting
if a grammar needs to be recompiled if it changes a second after producing
its tokens.

This likely only causes an issue for tests that frequently mutate files;
real humans are unlikely to compile within 1s of changing a grammar.
Still, this seems a cleaner solution that hacking the failing test to use
force a different modification time, as there will almost never be false
positives.

This fixes the failing test after making the test correct.
This commit is contained in:
Daniel Halperin 2017-07-11 20:58:24 -07:00
parent b09e30c6ca
commit a9dfca3666
1 changed files with 1 additions and 1 deletions
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2
antlr4-maven-plugin/src/main/java/org/antlr/mojo/antlr4/Antlr4Mojo.java
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@ -395,7 +395,7 @@ public class Antlr4Mojo extends AbstractMojo {
String tokensFileName = grammarFile.getName().split("\\.")[0] + ".tokens";
File outputFile = new File(outputDirectory, tokensFileName);
if ( (! outputFile.exists()) ||
outputFile.lastModified() < grammarFile.lastModified() ||
outputFile.lastModified() <= grammarFile.lastModified() ||
dependencies.isDependencyChanged(grammarFile)) {
grammarFilesToProcess.add(grammarFile);
}