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package org.antlr.runtime.test {
import flexunit.framework.TestCase;
import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.CharStream;
import org.antlr.runtime.CharStreamConstants;
public class TestANTLRStringStream extends TestCase {
public function TestANTLRStringStream() {
super();
}
public function testConsume():void {
var stream:CharStream = new ANTLRStringStream("abc");
assertEquals(stream.size, 3);
assertEquals(stream.charPositionInLine, 0);
assertEquals(stream.line, 1);
assertEquals(stream.index, 0);
for (var i:int = 0; i < stream.size; i++) {
stream.consume();
assertEquals(stream.size, 3); // invariant
assertEquals(stream.charPositionInLine, i + 1);
assertEquals(stream.line, 1); // invariant
assertEquals(stream.index, i + 1);
}
// now consume past EOF for a few ticks, nothing should change
for (i = 0; i < 5; i++) {
stream.consume();
assertEquals(stream.size, 3); // invariant
assertEquals(stream.charPositionInLine, 3);
assertEquals(stream.line, 1); // invariant
assertEquals(stream.index, 3);
}
}
public function testLA():void {
var stream:CharStream = new ANTLRStringStream("abc");
assertEquals(stream.LA(-1), CharStreamConstants.EOF); // should be EOF
assertEquals(stream.LA(0), 0); // should be 0 (undefined)
assertEquals(stream.LA(1), "a".charCodeAt(0));
assertEquals(stream.LA(2), "b".charCodeAt(0));
assertEquals(stream.LA(3), "c".charCodeAt(0));
assertEquals(stream.LA(4), CharStreamConstants.EOF);
// now consume() one byte and run some more tests.
stream.consume();
assertEquals(stream.LA(-2), CharStreamConstants.EOF);
assertEquals(stream.LA(-1), "a".charCodeAt(0));
assertEquals(stream.LA(0), 0); // should be 0 (undefined)
assertEquals(stream.LA(1), "b".charCodeAt(0));
assertEquals(stream.LA(2), "c".charCodeAt(0));
assertEquals(stream.LA(3), CharStreamConstants.EOF);
}
public function testReset():void {
var stream:ANTLRStringStream = new ANTLRStringStream("abc");
assertEquals(stream.size, 3);
assertEquals(stream.charPositionInLine, 0);
assertEquals(stream.line, 1);
assertEquals(stream.index, 0);
stream.consume();
stream.consume();
assertEquals(stream.size, 3);
assertEquals(stream.charPositionInLine, 2);
assertEquals(stream.line, 1);
assertEquals(stream.index, 2);
stream.reset();
assertEquals(stream.size, 3);
assertEquals(stream.charPositionInLine, 0);
assertEquals(stream.line, 1);
assertEquals(stream.index, 0);
}
public function testMark():void {
var stream:ANTLRStringStream = new ANTLRStringStream("a\nbc");
// setup a couple of markers
var mark1:int = stream.mark();
stream.consume();
stream.consume();
var mark2:int = stream.mark();
stream.consume();
// make sure we are where we expect to be
assertEquals(stream.charPositionInLine, 1);
assertEquals(stream.line, 2);
assertEquals(stream.index, 3);
assertEquals(mark1, 1);
assertTrue(mark1 != mark2);
stream.rewindTo(mark2);
assertEquals(stream.charPositionInLine, 0);
assertEquals(stream.line, 2);
assertEquals(stream.index, 2);
stream.rewindTo(mark1);
assertEquals(stream.index, 0);
assertEquals(stream.charPositionInLine, 0);
assertEquals(stream.line, 1);
// test two-level rewind
mark1 = stream.mark();
stream.consume();
stream.consume();
stream.mark();
stream.consume();
// make sure we are where we expect to be
assertEquals(stream.charPositionInLine, 1);
assertEquals(stream.line, 2);
assertEquals(stream.index, 3);
stream.rewindTo(mark1);
assertEquals(stream.index, 0);
assertEquals(stream.charPositionInLine, 0);
assertEquals(stream.line, 1);
}
}
}
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