Examples with TokenStreamRewriter org.antlr.v4.runtime.TokenStreamRewriter used on opensource projects

Example 41 with TokenStreamRewriter

use of org.antlr.v4.runtime.TokenStreamRewriter in project antlr4 by antlr.

the class TestTokenStreamRewriter method testCombineInsertOnLeftWithDelete.

@Test
public void testCombineInsertOnLeftWithDelete() throws Exception {
    LexerGrammar g = new LexerGrammar("lexer grammar T;\n" + "A : 'a';\n" + "B : 'b';\n" + "C : 'c';\n");
    String input = "abc";
    LexerInterpreter lexEngine = g.createLexerInterpreter(new ANTLRInputStream(input));
    CommonTokenStream stream = new CommonTokenStream(lexEngine);
    stream.fill();
    TokenStreamRewriter tokens = new TokenStreamRewriter(stream);
    tokens.delete(0, 2);
    tokens.insertBefore(0, "z");
    stream.fill();
    // combine with left edge of rewrite
    String result = tokens.getText();
    String expecting = "z";
    stream.fill();
    // make sure combo is not znull
    assertEquals(expecting, result);
}

Example 42 with TokenStreamRewriter

use of org.antlr.v4.runtime.TokenStreamRewriter in project antlr4 by antlr.

the class TestTokenStreamRewriter method testLeaveAloneDisjointInsert2.

@Test
public void testLeaveAloneDisjointInsert2() throws Exception {
    LexerGrammar g = new LexerGrammar("lexer grammar T;\n" + "A : 'a';\n" + "B : 'b';\n" + "C : 'c';\n");
    String input = "abcc";
    LexerInterpreter lexEngine = g.createLexerInterpreter(new ANTLRInputStream(input));
    CommonTokenStream stream = new CommonTokenStream(lexEngine);
    stream.fill();
    TokenStreamRewriter tokens = new TokenStreamRewriter(stream);
    tokens.replace(2, 3, "foo");
    tokens.insertBefore(1, "x");
    String result = tokens.getText();
    String expecting = "axbfoo";
    assertEquals(expecting, result);
}

Example 43 with TokenStreamRewriter

use of org.antlr.v4.runtime.TokenStreamRewriter in project antlr4 by antlr.

the class TestTokenStreamRewriter method testCombine3Inserts.

@Test
public void testCombine3Inserts() throws Exception {
    LexerGrammar g = new LexerGrammar("lexer grammar T;\n" + "A : 'a';\n" + "B : 'b';\n" + "C : 'c';\n");
    String input = "abc";
    LexerInterpreter lexEngine = g.createLexerInterpreter(new ANTLRInputStream(input));
    CommonTokenStream stream = new CommonTokenStream(lexEngine);
    stream.fill();
    TokenStreamRewriter tokens = new TokenStreamRewriter(stream);
    tokens.insertBefore(1, "x");
    tokens.insertBefore(0, "y");
    tokens.insertBefore(1, "z");
    String result = tokens.getText();
    String expecting = "yazxbc";
    assertEquals(expecting, result);
}