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small improvement in error msg

This commit is contained in:
Terence Parr 2012-11-17 16:07:40 -08:00
parent 78c75ee5e4
commit e366f00820
1 changed files with 8 additions and 6 deletions
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8
runtime/Java/src/org/antlr/v4/runtime/misc/TestRig.java
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@ -138,19 +138,21 @@ public class TestRig {
// System.out.println("exec "+grammarName+"."+startRuleName); // System.out.println("exec "+grammarName+"."+startRuleName);
String lexerName = grammarName+"Lexer"; String lexerName = grammarName+"Lexer";
ClassLoader cl = Thread.currentThread().getContextClassLoader(); ClassLoader cl = Thread.currentThread().getContextClassLoader();
Class<? extends Lexer> lexerClass; Class<? extends Lexer> lexerClass = null;
try { try {
lexerClass = cl.loadClass(lexerName).asSubclass(Lexer.class); lexerClass = cl.loadClass(lexerName).asSubclass(Lexer.class);
} }
catch (java.lang.ClassNotFoundException cnfe) { catch (java.lang.ClassNotFoundException cnfe) {
// might be pure lexer grammar; no Lexer suffix then // might be pure lexer grammar; no Lexer suffix then
lexerName = grammarName; lexerName = grammarName;
try {
lexerClass = cl.loadClass(lexerName).asSubclass(Lexer.class); lexerClass = cl.loadClass(lexerName).asSubclass(Lexer.class);
} }
if ( lexerClass==null ) { catch (ClassNotFoundException cnfe2) {
System.err.println("Can't load "+lexerName); System.err.println("Can't load "+lexerName+" as lexer or parser");
return; return;
} }
}
Constructor<? extends Lexer> lexerCtor = lexerClass.getConstructor(CharStream.class); Constructor<? extends Lexer> lexerCtor = lexerClass.getConstructor(CharStream.class);
Lexer lexer = lexerCtor.newInstance((CharStream)null); Lexer lexer = lexerCtor.newInstance((CharStream)null);