Examples of org.antlr.runtime.TokenRewriteStream$ReplaceOp

org.antlr.runtime.TokenRewriteStream
I'm going to try replacing range from x..y with (y-x)+1 ReplaceOp instructions.

      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.LT(1); // fill buffer
    tokens.replace(2, "x");
    String result = tokens.toString();
    String expecting = "abx";
    assertEquals(expecting, result);
  }

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      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.LT(1); // fill buffer
    tokens.replace(1, "x");
    String result = tokens.toString();
    String expecting = "axc";
    assertEquals(expecting, result);
  }

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            "WS : ' '+;\n");
        // Tokens: 0123456789
        // Input:  x = 3 * 0;
        CharStream input = new ANTLRStringStream("x = 3 * 0;");
        Interpreter lexEngine = new Interpreter(g, input);
        TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
        tokens.LT(1); // fill buffer
        tokens.replace(4, 8, "0"); // replace 3 * 0 with 0


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


        result = tokens.toString();
        expecting = "x = 0;";
        assertEquals(expecting, result);


        result = tokens.toString(0,9);
        expecting = "x = 0;";
        assertEquals(expecting, result);


        result = tokens.toString(4,8);
        expecting = "0";
        assertEquals(expecting, result);
    }

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            "WS : ' '+;\n");
        // Tokens: 012345678901234567
        // Input:  x = 3 * 0 + 2 * 0;
        CharStream input = new ANTLRStringStream("x = 3 * 0 + 2 * 0;");
        Interpreter lexEngine = new Interpreter(g, input);
        TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
        tokens.LT(1); // fill buffer


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


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


        result = tokens.toString(0,17);
        expecting = "x = 0 + 2 * 0;";
        assertEquals(expecting, result);


        result = tokens.toString(4,8);
        expecting = "0";
        assertEquals(expecting, result);


        result = tokens.toString(0,8);
        expecting = "x = 0";
        assertEquals(expecting, result);


        result = tokens.toString(12,16);
        expecting = "2 * 0";
        assertEquals(expecting, result);


        tokens.insertAfter(17, "// comment");
        result = tokens.toString(12,17);
        expecting = "2 * 0;// comment";
        assertEquals(expecting, result);


        result = tokens.toString(0,8); // try again after insert at end
        expecting = "x = 0";
        assertEquals(expecting, result);
    }

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      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.LT(1); // fill buffer
    tokens.replace(1, "x");
    tokens.replace(1, "y");
    String result = tokens.toString();
    String expecting = "ayc";
    assertEquals(expecting, result);
  }

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      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.LT(1); // fill buffer
        tokens.insertBefore(0, "_");
        tokens.replace(1, "x");
    tokens.replace(1, "y");
    String result = tokens.toString();
    String expecting = "_ayc";
    assertEquals(expecting, result);
  }

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      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.LT(1); // fill buffer
    tokens.replace(1, "x");
    tokens.delete(1);
    String result = tokens.toString();
    String expecting = "ac";
    assertEquals(expecting, result);
  }

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      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.LT(1); // fill buffer
    tokens.replace(0, 2, "x");
    tokens.insertBefore(1, "0");
    Exception exc = null;
    try {
      tokens.toString();
    }
    catch (IllegalArgumentException iae) {
      exc = iae;
    }
    String expecting = "insert op <InsertBeforeOp@1:\"0\"> within boundaries of previous <ReplaceOp@0..2:\"x\">";

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      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.LT(1); // fill buffer
    tokens.insertBefore(0, "0");
    tokens.replace(0, "x"); // supercedes insert at 0
    String result = tokens.toString();
    String expecting = "xbc";
    assertEquals(expecting, result);
  }

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      "A : 'a';\n" +
      "B : 'b';\n" +
      "C : 'c';\n");
    CharStream input = new ANTLRStringStream("abc");
    Interpreter lexEngine = new Interpreter(g, input);
    TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
    tokens.LT(1); // fill buffer
    tokens.insertBefore(1, "x");
    tokens.insertBefore(1, "y");
    String result = tokens.toString();
    String expecting = "ayxbc";
    assertEquals(expecting, result);
  }

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