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

Example 46 with LexerInterpreter

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

the class TestTokenStreamRewriter method test2InsertMiddleIndex.

@Test
public void test2InsertMiddleIndex() 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(1, "y");
    String result = tokens.getText();
    String expecting = "ayxbc";
    assertEquals(expecting, result);
}

Example 47 with LexerInterpreter

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

the class TestTokenStreamRewriter method testReplaceLastIndex.

@Test
public void testReplaceLastIndex() 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.replace(2, "x");
    String result = tokens.getText();
    String expecting = "abx";
    assertEquals(expecting, result);
}

Example 48 with LexerInterpreter

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

the class TestTokenStreamRewriter method testInsertBeforeIndex0.

@Test
public void testInsertBeforeIndex0() throws Exception {
    LexerGrammar g = new LexerGrammar("lexer grammar T;\n" + "A : 'a';\n" + "B : 'b';\n" + "C : 'c';\n");
    LexerInterpreter lexEngine = g.createLexerInterpreter(new ANTLRInputStream("abc"));
    CommonTokenStream stream = new CommonTokenStream(lexEngine);
    stream.fill();
    TokenStreamRewriter tokens = new TokenStreamRewriter(stream);
    tokens.insertBefore(0, "0");
    String result = tokens.getText();
    String expecting = "0abc";
    assertEquals(expecting, result);
}

Example 49 with LexerInterpreter

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

the class TestTokenStreamRewriter method testOverlappingReplace2.

@Test
public void testOverlappingReplace2() 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(0, 3, "bar");
    tokens.replace(1, 2, "foo");
    stream.fill();
    // cannot split earlier replace
    Exception exc = null;
    try {
        tokens.getText();
    } catch (IllegalArgumentException iae) {
        exc = iae;
    }
    String expecting = "replace op boundaries of <ReplaceOp@[@1,1:1='b',<2>,1:1]..[@2,2:2='c',<3>,1:2]:\"foo\"> overlap with previous <ReplaceOp@[@0,0:0='a',<1>,1:0]..[@3,3:3='c',<3>,1:3]:\"bar\">";
    assertNotNull(exc);
    assertEquals(expecting, exc.getMessage());
}

Example 50 with LexerInterpreter

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

the class TestTokenStreamRewriter method test2InsertThenReplaceIndex0.

@Test
public void test2InsertThenReplaceIndex0() 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(0, "x");
    tokens.insertBefore(0, "y");
    tokens.replace(0, "z");
    String result = tokens.getText();
    String expecting = "yxzbc";
    assertEquals(expecting, result);
}