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add unit test for issue 550

This commit is contained in:
Terence Parr 2014-06-10 12:10:01 -07:00
parent 358a1025d2
commit 8447661a28
1 changed files with 21 additions and 0 deletions
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21
tool/test/org/antlr/v4/test/TestTokenStreamRewriter.java
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@ -881,4 +881,25 @@ public class TestTokenStreamRewriter extends BaseTest {
assertEquals(expecting, result);
}
// Test for https://github.com/antlr/antlr4/issues/550
@Test public void testPreservesOrderOfContiguousInserts() throws Exception {
LexerGrammar g = new LexerGrammar(
"lexer grammar T;\n"+
"A : 'a';\n" +
"B : 'b';\n" +
"C : 'c';\n");
String input = "aa";
LexerInterpreter lexEngine = g.createLexerInterpreter(new ANTLRInputStream(input));
CommonTokenStream stream = new CommonTokenStream(lexEngine);
stream.fill();
TokenStreamRewriter tokens = new TokenStreamRewriter(stream);
tokens.insertBefore(0, "<b>");
tokens.insertAfter(0, "</b>");
tokens.insertBefore(1, "<b>");
tokens.insertAfter(1, "</b>");
String result = tokens.getText();
String expecting = "<b>a</b><b>a</b>"; // fails with <b>a<b></b>a</b>"
assertEquals(expecting, result);
}
}