Package org.antlr.v4.tool

Examples of org.antlr.v4.tool.LexerGrammar

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    String expecting = "INT, WS, INT, EOF";
    checkLexerMatches(lg, "32 99", expecting);
  }

  @Test public void testRecursiveLexerRuleRef() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "CMT : '/*' (CMT | ~'*')+ '*/' ;\n" +
      "WS : (' '|'\\n')+ ;");
    String expecting = "CMT, WS, CMT, EOF";
    checkLexerMatches(lg, "/* ick */\n/* /*nested*/ */", expecting);
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    String expecting = "CMT, WS, CMT, EOF";
    checkLexerMatches(lg, "/* ick */\n/* /*nested*/ */", expecting);
  }

  @Test public void testRecursiveLexerRuleRefWithWildcard() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "CMT : '/*' (CMT | .)*? '*/' ;\n" +
      "WS : (' '|'\\n')+ ;");

    String expecting = "CMT, WS, CMT, WS, EOF";
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              "/* /*nested*/ */\n",
              expecting);
  }

  @Test public void testLexerWildcardGreedyLoopByDefault() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "CMT : '//' .* '\\n' ;\n");
    String expecting = "CMT, EOF";
    checkLexerMatches(lg, "//x\n//y\n", expecting);
  }
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    String expecting = "CMT, EOF";
    checkLexerMatches(lg, "//x\n//y\n", expecting);
  }

  @Test public void testLexerWildcardLoopExplicitNonGreedy() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "CMT : '//' .*? '\\n' ;\n");
    String expecting = "CMT, CMT, EOF";
    checkLexerMatches(lg, "//x\n//y\n", expecting);
  }
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    String expecting = "CMT, CMT, EOF";
    checkLexerMatches(lg, "//x\n//y\n", expecting);
  }

  @Test public void testLexerEscapeInString() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "STR : '[' ('~' ']' | .)* ']' ;\n");
    checkLexerMatches(lg, "[a~]b]", "STR, EOF");
    checkLexerMatches(lg, "[a]", "STR, EOF");
  }
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    checkLexerMatches(lg, "[a~]b]", "STR, EOF");
    checkLexerMatches(lg, "[a]", "STR, EOF");
  }

  @Test public void testLexerWildcardGreedyPlusLoopByDefault() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "CMT : '//' .+ '\\n' ;\n");
    String expecting = "CMT, EOF";
    checkLexerMatches(lg, "//x\n//y\n", expecting);
  }
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    String expecting = "CMT, EOF";
    checkLexerMatches(lg, "//x\n//y\n", expecting);
  }

  @Test public void testLexerWildcardExplicitNonGreedyPlusLoop() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "CMT : '//' .+? '\\n' ;\n");
    String expecting = "CMT, CMT, EOF";
    checkLexerMatches(lg, "//x\n//y\n", expecting);
  }
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    checkLexerMatches(lg, "//x\n//y\n", expecting);
  }

  // does not fail since ('*/')? can't match and have rule succeed
  @Test public void testLexerGreedyOptionalShouldWorkAsWeExpect() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "CMT : '/*' ('*/')? '*/' ;\n");
    String expecting = "CMT, EOF";
    checkLexerMatches(lg, "/**/", expecting);
  }
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    String expecting = "CMT, EOF";
    checkLexerMatches(lg, "/**/", expecting);
  }

  @Test public void testGreedyBetweenRules() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "A : '<a>' ;\n" +
      "B : '<' .+ '>' ;\n");
    String expecting = "B, EOF";
    checkLexerMatches(lg, "<a><x>", expecting);
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    String expecting = "B, EOF";
    checkLexerMatches(lg, "<a><x>", expecting);
  }

  @Test public void testNonGreedyBetweenRules() throws Exception {
    LexerGrammar lg = new LexerGrammar(
      "lexer grammar L;\n"+
      "A : '<a>' ;\n" +
      "B : '<' .+? '>' ;\n");
    String expecting = "A, B, EOF";
    checkLexerMatches(lg, "<a><x>", expecting);
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Related Classes of org.antlr.v4.tool.LexerGrammar

  • org.antlr.runtime.ANTLRFileStream
  • org.antlr.runtime.ANTLRStringStream
  • org.antlr.runtime.CharStream
  • org.antlr.runtime.CommonToken
  • org.antlr.runtime.Token
  • org.antlr.runtime.tree.CommonTree
  • org.antlr.runtime.tree.CommonTreeNodeStream
  • org.antlr.runtime.tree.Tree
  • org.antlr.runtime.tree.TreeVisitor
  • org.antlr.runtime.tree.TreeVisitorAction
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