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

Example 31 with ANTLRInputStream

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

the class TestTokenStreamRewriter method testToStringStartStop.

@Test
public void testToStringStartStop() throws Exception {
    LexerGrammar g = new LexerGrammar("lexer grammar T;\n" + "ID : 'a'..'z'+;\n" + "INT : '0'..'9'+;\n" + "SEMI : ';';\n" + "MUL : '*';\n" + "ASSIGN : '=';\n" + "WS : ' '+;\n");
    // Tokens: 0123456789
    // Input:  x = 3 * 0;
    String input = "x = 3 * 0;";
    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);
    result = tokens.getText();
    expecting = "x = 0;";
    assertEquals(expecting, result);
    result = tokens.getText(Interval.of(0, 9));
    expecting = "x = 0;";
    assertEquals(expecting, result);
    result = tokens.getText(Interval.of(4, 8));
    expecting = "0";
    assertEquals(expecting, result);
}

Example 32 with ANTLRInputStream

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

the class TestTokenStreamRewriter method test2ReplaceMiddleIndex1InsertBefore.

@Test
public void test2ReplaceMiddleIndex1InsertBefore() 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, "_");
    tokens.replace(1, "x");
    tokens.replace(1, "y");
    String result = tokens.getText();
    String expecting = "_ayc";
    assertEquals(expecting, result);
}

Example 33 with ANTLRInputStream

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

the class TestTokenStreamRewriter method testOverlappingReplace3.

@Test
public void testOverlappingReplace3() 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(1, 2, "foo");
    tokens.replace(0, 2, "bar");
    stream.fill();
    // wipes prior nested replace
    String result = tokens.getText();
    String expecting = "barc";
    assertEquals(expecting, result);
}

Example 34 with ANTLRInputStream

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

the class TestTokenStreamRewriter method testDistinguishBetweenInsertAfterAndInsertBeforeToPreserverOrder2.

@Test
public void testDistinguishBetweenInsertAfterAndInsertBeforeToPreserverOrder2() throws Exception {
    LexerGrammar g = new LexerGrammar("lexer grammar T;\n" + "A : 'a';\n" + "B : 'b';\n" + "C : 'c';\n");
    String input = "aa";
    LexerInterpreter lexEngine = g.createLexerInterpreter(new ANTLRInputStream(input));
    CommonTokenStream stream = new CommonTokenStream(lexEngine);
    stream.fill();
    TokenStreamRewriter tokens = new TokenStreamRewriter(stream);
    tokens.insertBefore(0, "<p>");
    tokens.insertBefore(0, "<b>");
    tokens.insertAfter(0, "</p>");
    tokens.insertAfter(0, "</b>");
    tokens.insertBefore(1, "<b>");
    tokens.insertAfter(1, "</b>");
    String result = tokens.getText();
    String expecting = "<b><p>a</p></b><b>a</b>";
    assertEquals(expecting, result);
}

Example 35 with ANTLRInputStream

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

the class TestTokenStreamRewriter method testInsertThenReplaceSameIndex.

@Test
public void testInsertThenReplaceSameIndex() 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, "0");
    tokens.replace(0, "x");
    stream.fill();
    // supercedes insert at 0
    String result = tokens.getText();
    String expecting = "0xbc";
    assertEquals(expecting, result);
}