Package org.antlr.test

Source Code of org.antlr.test.TestInterpretedParsing

/*
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Copyright (c) 2005-2006 Terence Parr
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    documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
    derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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package org.antlr.test;

import org.antlr.tool.Grammar;
import org.antlr.tool.Interpreter;
import org.antlr.runtime.*;
import org.antlr.runtime.tree.ParseTree;

public class TestInterpretedParsing extends BaseTest {

    /** Public default constructor used by TestRig */
    public TestInterpretedParsing() {
    }

  public void testSimpleParse() throws Exception {
    Grammar pg = new Grammar(
      "parser grammar p;\n"+
      "prog : WHILE ID LCURLY (assign)* RCURLY EOF;\n" +
      "assign : ID ASSIGN expr SEMI ;\n" +
      "expr : INT | FLOAT | ID ;\n");
    Grammar g = new Grammar();
    g.importTokenVocabulary(pg);
    g.setFileName(Grammar.IGNORE_STRING_IN_GRAMMAR_FILE_NAME +"string");
    g.setGrammarContent(
      "lexer grammar t;\n"+
      "WHILE : 'while';\n"+
      "LCURLY : '{';\n"+
      "RCURLY : '}';\n"+
      "ASSIGN : '=';\n"+
      "SEMI : ';';\n"+
      "ID : ('a'..'z')+ ;\n"+
      "INT : (DIGIT)+ ;\n"+
      "FLOAT : (DIGIT)+ '.' (DIGIT)* ;\n"+
      "fragment DIGIT : '0'..'9';\n" +
      "WS : (' ')+ ;\n");
    CharStream input = new ANTLRStringStream("while x { i=1; y=3.42; z=y; }");
    Interpreter lexEngine = new Interpreter(g, input);

    CommonTokenStream tokens = new CommonTokenStream(lexEngine);
    tokens.setTokenTypeChannel(g.getTokenType("WS"), 99);
    //System.out.println("tokens="+tokens.toString());
    Interpreter parseEngine = new Interpreter(pg, tokens);
    ParseTree t = parseEngine.parse("prog");
    String result = t.toStringTree();
    String expecting =
      "(<grammar p> (prog while x { (assign i = (expr 1) ;) (assign y = (expr 3.42) ;) (assign z = (expr y) ;) } <EOF>))";
    assertEquals(expecting, result);
  }

  public void testMismatchedTokenError() throws Exception {
    Grammar pg = new Grammar(
      "parser grammar p;\n"+
      "prog : WHILE ID LCURLY (assign)* RCURLY;\n" +
      "assign : ID ASSIGN expr SEMI ;\n" +
      "expr : INT | FLOAT | ID ;\n");
    Grammar g = new Grammar();
    g.setFileName(Grammar.IGNORE_STRING_IN_GRAMMAR_FILE_NAME +"string");
    g.importTokenVocabulary(pg);
    g.setGrammarContent(
      "lexer grammar t;\n"+
      "WHILE : 'while';\n"+
      "LCURLY : '{';\n"+
      "RCURLY : '}';\n"+
      "ASSIGN : '=';\n"+
      "SEMI : ';';\n"+
      "ID : ('a'..'z')+ ;\n"+
      "INT : (DIGIT)+ ;\n"+
      "FLOAT : (DIGIT)+ '.' (DIGIT)* ;\n"+
      "fragment DIGIT : '0'..'9';\n" +
      "WS : (' ')+ ;\n");
    CharStream input = new ANTLRStringStream("while x { i=1 y=3.42; z=y; }");
    Interpreter lexEngine = new Interpreter(g, input);

    CommonTokenStream tokens = new CommonTokenStream(lexEngine);
    tokens.setTokenTypeChannel(g.getTokenType("WS"), 99);
    //System.out.println("tokens="+tokens.toString());
    Interpreter parseEngine = new Interpreter(pg, tokens);
    ParseTree t = parseEngine.parse("prog");
    String result = t.toStringTree();
    String expecting =
      "(<grammar p> (prog while x { (assign i = (expr 1) MismatchedTokenException(5!=9))))";
    assertEquals(expecting, result);
  }

  public void testMismatchedSetError() throws Exception {
    Grammar pg = new Grammar(
      "parser grammar p;\n"+
      "prog : WHILE ID LCURLY (assign)* RCURLY;\n" +
      "assign : ID ASSIGN expr SEMI ;\n" +
      "expr : INT | FLOAT | ID ;\n");
    Grammar g = new Grammar();
    g.importTokenVocabulary(pg);
    g.setFileName("<string>");
    g.setGrammarContent(
      "lexer grammar t;\n"+
      "WHILE : 'while';\n"+
      "LCURLY : '{';\n"+
      "RCURLY : '}';\n"+
      "ASSIGN : '=';\n"+
      "SEMI : ';';\n"+
      "ID : ('a'..'z')+ ;\n"+
      "INT : (DIGIT)+ ;\n"+
      "FLOAT : (DIGIT)+ '.' (DIGIT)* ;\n"+
      "fragment DIGIT : '0'..'9';\n" +
      "WS : (' ')+ ;\n");
    CharStream input = new ANTLRStringStream("while x { i=; y=3.42; z=y; }");
    Interpreter lexEngine = new Interpreter(g, input);

    CommonTokenStream tokens = new CommonTokenStream(lexEngine);
    tokens.setTokenTypeChannel(g.getTokenType("WS"), 99);
    //System.out.println("tokens="+tokens.toString());
    Interpreter parseEngine = new Interpreter(pg, tokens);
    ParseTree t = parseEngine.parse("prog");
    String result = t.toStringTree();
    String expecting =
      "(<grammar p> (prog while x { (assign i = (expr MismatchedSetException(9!={5,10,11})))))";
    assertEquals(expecting, result);
  }

  public void testNoViableAltError() throws Exception {
    Grammar pg = new Grammar(
      "parser grammar p;\n"+
      "prog : WHILE ID LCURLY (assign)* RCURLY;\n" +
      "assign : ID ASSIGN expr SEMI ;\n" +
      "expr : {;}INT | FLOAT | ID ;\n");
    Grammar g = new Grammar();
    g.importTokenVocabulary(pg);
    g.setFileName("<string>");
    g.setGrammarContent(
      "lexer grammar t;\n"+
      "WHILE : 'while';\n"+
      "LCURLY : '{';\n"+
      "RCURLY : '}';\n"+
      "ASSIGN : '=';\n"+
      "SEMI : ';';\n"+
      "ID : ('a'..'z')+ ;\n"+
      "INT : (DIGIT)+ ;\n"+
      "FLOAT : (DIGIT)+ '.' (DIGIT)* ;\n"+
      "fragment DIGIT : '0'..'9';\n" +
      "WS : (' ')+ ;\n");
    CharStream input = new ANTLRStringStream("while x { i=; y=3.42; z=y; }");
    Interpreter lexEngine = new Interpreter(g, input);

    CommonTokenStream tokens = new CommonTokenStream(lexEngine);
    tokens.setTokenTypeChannel(g.getTokenType("WS"), 99);
    //System.out.println("tokens="+tokens.toString());
    Interpreter parseEngine = new Interpreter(pg, tokens);
    ParseTree t = parseEngine.parse("prog");
    String result = t.toStringTree();
    String expecting =
      "(<grammar p> (prog while x { (assign i = (expr NoViableAltException(9!=[4:1: expr : ( INT | FLOAT | ID );])))))";
    assertEquals(expecting, result);
  }

}
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