Examples of org.antlr.v4.runtime.CommonTokenStream.fill()

Class org.antlr.v4.runtime.CommonTokenStream

Examples of org.antlr.v4.runtime.CommonTokenStream.fill()

org.antlr.v4.runtime.CommonTokenStream.fill()
Add {@code n} characters to the buffer. Returns the number of charactersactually added to the buffer. If the return value is less than {@code n}, then EOF was reached before {@code n} characters could be added.

    LexerInterpreter lexEngine = g.createLexerInterpreter(new ANTLRInputStream(input));
    CommonTokenStream stream = new CommonTokenStream(lexEngine);
    stream.fill();
    TokenStreamRewriter tokens = new TokenStreamRewriter(stream);
    tokens.replace(4, 8, "0");
    stream.fill();
// replace 3 * 0 with 0


    String result = tokens.getTokenStream().getText();
    String expecting = "x = 3 * 0;";
    assertEquals(expecting, result);

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    // Tokens: 012345678901234567
    // Input:  x = 3 * 0 + 2 * 0;
    String input = "x = 3 * 0 + 2 * 0;";
    LexerInterpreter lexEngine = g.createLexerInterpreter(new ANTLRInputStream(input));
    CommonTokenStream stream = new CommonTokenStream(lexEngine);
    stream.fill();
    TokenStreamRewriter tokens = new TokenStreamRewriter(stream);


    String result = tokens.getTokenStream().getText();
    String expecting = "x = 3 * 0 + 2 * 0;";
    assertEquals(expecting, result);

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    String result = tokens.getTokenStream().getText();
    String expecting = "x = 3 * 0 + 2 * 0;";
    assertEquals(expecting, result);


    tokens.replace(4, 8, "0");
    stream.fill();
// replace 3 * 0 with 0
    result = tokens.getText();
    expecting = "x = 0 + 2 * 0;";
    assertEquals(expecting, result);

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    result = tokens.getText(Interval.of(12, 18));
    expecting = "2 * 0;// comment";
    assertEquals(expecting, result);


    result = tokens.getText(Interval.of(0, 8));
    stream.fill();
// try again after insert at end
    expecting = "x = 0";
    assertEquals(expecting, result);
  }

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                       "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(1, "x");
    tokens.replace(1, "y");
    String result = tokens.getText();
    String expecting = "ayc";

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                       "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, "_");
    tokens.replace(1, "x");
    tokens.replace(1, "y");
    String result = tokens.getText();

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                       "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(1, "x");
    tokens.delete(1);
    String result = tokens.getText();
    String expecting = "ac";

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                       "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(0, 2, "x");
    tokens.insertBefore(1, "0");
    Exception exc = null;
    try {

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                       "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, "0");
    tokens.replace(0, "x");
    stream.fill();
// supercedes insert at 0

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    CommonTokenStream stream = new CommonTokenStream(lexEngine);
    stream.fill();
    TokenStreamRewriter tokens = new TokenStreamRewriter(stream);
    tokens.insertBefore(0, "0");
    tokens.replace(0, "x");
    stream.fill();
// supercedes insert at 0
    String result = tokens.getText();
    String expecting = "0xbc";
    assertEquals(expecting, result);
  }

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