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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.javacc;
import org.junit.Test;
import java.io.IOException;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
/**
* @author Simon Thoresen Hult
*/
public class FastCharStreamTestCase {
@Test
public void requireThatInputCanBeRead() throws IOException {
FastCharStream input = new FastCharStream("foo");
assertEquals('f', input.readChar());
assertEquals('o', input.readChar());
assertEquals('o', input.readChar());
try {
input.readChar();
fail();
} catch (IOException e) {
}
}
@Test
public void requireThatColumnIsTracked() throws IOException {
FastCharStream input = new FastCharStream("foo");
assertEquals(1, input.getEndColumn());
input.readChar();
assertEquals(2, input.getEndColumn());
input.readChar();
assertEquals(3, input.getEndColumn());
input.readChar();
assertEquals(4, input.getEndColumn());
}
@Test
public void requireThatLineIsNotTracked() throws IOException {
FastCharStream input = new FastCharStream("f\no");
assertEquals(-1, input.getEndLine());
assertEquals(-1, input.getBeginLine());
input.readChar();
assertEquals(-1, input.getBeginLine());
input.readChar();
assertEquals(-1, input.getBeginLine());
input.readChar();
assertEquals(-1, input.getBeginLine());
assertEquals(-1, input.getEndLine());
}
@Test
public void requireThatBackupIsSupported() throws IOException {
FastCharStream input = new FastCharStream("foo");
assertEquals('f', input.readChar());
input.backup(1);
assertEquals('f', input.readChar());
assertEquals('o', input.readChar());
input.backup(2);
assertEquals('f', input.readChar());
assertEquals('o', input.readChar());
assertEquals('o', input.readChar());
input.backup(3);
assertEquals('f', input.readChar());
assertEquals('o', input.readChar());
assertEquals('o', input.readChar());
input.backup(2);
assertEquals('o', input.readChar());
assertEquals('o', input.readChar());
input.backup(1);
assertEquals('o', input.readChar());
}
@Test
public void requireThatSuffixIsNotSupported() {
try {
new FastCharStream("foo").getSuffix(0);
fail();
} catch (UnsupportedOperationException e) {
}
}
@Test
public void requireThatDoneDoesNotThrowException() {
FastCharStream input = new FastCharStream("foo");
input.done();
}
@Test
public void requireThatTokensCanBeRetrieved() throws IOException {
FastCharStream input = new FastCharStream("foo bar baz");
input.readChar();
input.readChar();
input.readChar();
input.readChar();
assertEquals('b', input.beginToken());
assertEquals(5, input.getBeginColumn());
assertEquals(-1, input.getBeginLine());
assertEquals(6, input.getEndColumn());
assertEquals(-1, input.getEndLine());
assertEquals('a', input.readChar());
assertEquals('r', input.readChar());
assertEquals(8, input.getEndColumn());
assertEquals(-1, input.getEndLine());
assertEquals("bar", input.getImage());
}
@Test
public void requireThatExceptionsDetectLineNumber() {
FastCharStream input = new FastCharStream("foo\nbar");
assertEquals("line 2, column 1\n" +
"At position:\n" +
"bar\n" +
"^",
input.formatException("line -1, column 5"));
assertEquals("line 2, column 2\n" +
"At position:\n" +
"bar\n" +
" ^",
input.formatException("line -1, column 6"));
assertEquals("line 2, column 3\n" +
"At position:\n" +
"bar\n" +
" ^",
input.formatException("line -1, column 7"));
assertEquals("line 2, column 4\n" +
"At position:\n" +
"bar\n" +
" ^",
input.formatException("line -1, column 8"));
assertEquals("foo line 2, column 2\n" +
"At position:\n" +
"bar\n" +
" ^",
input.formatException("foo line -1, column 6"));
assertEquals("foo line 2, column 2 bar\n" +
"At position:\n" +
"bar\n" +
" ^",
input.formatException("foo line -1, column 6 bar"));
assertEquals("line 2, column 2 bar\n" +
"At position:\n" +
"bar\n" +
" ^",
input.formatException("line -1, column 6 bar"));
}
@Test
public void requireErrorMsgExceptionAtEOF() {
FastCharStream input = new FastCharStream("\n");
assertEquals("line 1, column 1\n" +
"At position:\n" +
"EOF\n" +
"^",
input.formatException("line -1, column 1"));
}
@Test
public void requireThatUnknownExceptionFormatIsIgnored() {
FastCharStream input = new FastCharStream("foo\nbar");
assertEquals("",
input.formatException(""));
assertEquals("foo",
input.formatException("foo"));
assertEquals("foo line -1, column ",
input.formatException("foo line -1, column "));
assertEquals("foo line -1, column bar",
input.formatException("foo line -1, column bar"));
}
@Test
public void requireThatIllegalExceptionColumnIsIgnored() {
FastCharStream input = new FastCharStream("foo\nbar");
assertEquals("line -1, column 9",
input.formatException("line -1, column 9"));
}
}
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