public override void RecognitionException(RecognitionException e)
{
if (backtracking > 0)
{
return;
}
ParseTree ruleNode = callStack.Peek();
ParseTree errorNode = Create(e);
ruleNode.AddChild(errorNode);
}
public override void EnterRule(string filename, string ruleName)
{
if (backtracking > 0)
{
return;
}
ParseTree parentRuleNode = callStack.Peek();
ParseTree ruleNode = Create(ruleName);
parentRuleNode.AddChild(ruleNode);
callStack.Push(ruleNode);
}
public override void ConsumeToken(IToken token)
{
if (backtracking > 0)
{
return;
}
ParseTree ruleNode = callStack.Peek();
ParseTree elementNode = Create(token);
elementNode.hiddenTokens = this.hiddenTokens;
this.hiddenTokens = new List <IToken>();
ruleNode.AddChild(elementNode);
}
public override void ExitRule(string filename, string ruleName)
{
if (backtracking > 0)
{
return;
}
ParseTree ruleNode = callStack.Peek();
if (ruleNode.ChildCount == 0)
{
ruleNode.AddChild(EpsilonNode());
}
callStack.Pop();
}
public void TestMismatchedTokenError()
{
Assert.Inconclusive("May be failing on just my port...");
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.FileName = 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");
ICharStream input = new ANTLRStringStream("while x { i=1 y=3.42; z=y; }");
Interpreter lexEngine = new Interpreter(g, input);
FilteringTokenStream tokens = new FilteringTokenStream(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 TestNoViableAltError()
{
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.FileName = "<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");
ICharStream input = new ANTLRStringStream("while x { i=; y=3.42; z=y; }");
Interpreter lexEngine = new Interpreter(g, input);
FilteringTokenStream tokens = new FilteringTokenStream(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(10@[4:1: expr : ( INT | FLOAT | ID );])))))";
Assert.AreEqual(expecting, result);
}
public ParseTreeBuilder(string grammarName)
{
ParseTree root = Create("<grammar " + grammarName + ">");
callStack.Push(root);
}
