public void ProductionExpressionShouldSupportAlterationOfStringAndLexerRule()
{
ProductionExpression
S = "S";
BaseLexerRule
a = new StringLiteralLexerRule("a");
S.Rule = (Expr)"b" | a;
Assert.IsNotNull(S.ProductionModel);
Assert.AreEqual(2, S.ProductionModel.Alterations.Count);
Assert.AreEqual(1, S.ProductionModel.Alterations[0].Symbols.Count);
Assert.AreEqual(1, S.ProductionModel.Alterations[1].Symbols.Count);
}
IEnumerable<ProductionModel> Factor(EbnfFactor factor, ProductionModel currentProduction)
{
switch (factor.NodeType)
{
case EbnfNodeType.EbnfFactorGrouping:
var grouping = factor as EbnfFactorGrouping;
foreach (var production in Grouping(grouping, currentProduction))
yield return production;
break;
case EbnfNodeType.EbnfFactorOptional:
var optional = factor as EbnfFactorOptional;
foreach (var production in Optional(optional, currentProduction))
yield return production;
break;
case EbnfNodeType.EbnfFactorRepetition:
var repetition = factor as EbnfFactorRepetition;
foreach (var production in Repetition(repetition, currentProduction))
yield return production;
break;
case EbnfNodeType.EbnfFactorIdentifier:
var identifier = factor as EbnfFactorIdentifier;
var nonTerminal = GetNonTerminalFromQualifiedIdentifier(identifier.QualifiedIdentifier);
currentProduction.AddWithAnd(new NonTerminalModel(nonTerminal));
break;
case EbnfNodeType.EbnfFactorLiteral:
var literal = factor as EbnfFactorLiteral;
var stringLiteralRule = new StringLiteralLexerRule(literal.Value);
currentProduction.AddWithAnd( new LexerRuleModel(stringLiteralRule));
break;
case EbnfNodeType.EbnfFactorRegex:
var regex = factor as EbnfFactorRegex;
var nfa = _thompsonConstructionAlgorithm.Transform(regex.Regex);
var dfa = _subsetConstructionAlgorithm.Transform(nfa);
var dfaLexerRule = new DfaLexerRule(dfa, regex.Regex.ToString());
currentProduction.AddWithAnd(new LexerRuleModel(dfaLexerRule));
break;
}
}
public void ProductionExpressionShouldSupportConcatenationOfTwoBaseLexerRules()
{
ProductionExpression
S = "S";
BaseLexerRule
a = new StringLiteralLexerRule("a"),
b = new StringLiteralLexerRule("b");
S.Rule = (Expr) a + b;
Assert.IsNotNull(S.ProductionModel);
Assert.AreEqual(1, S.ProductionModel.Alterations.Count);
Assert.AreEqual(2, S.ProductionModel.Alterations[0].Symbols.Count);
}
public void GrammarModelToGrammarShouldCreateGrammar()
{
var grammarModel = new GrammarModel();
var S = new ProductionModel("S");
var A = new ProductionModel("A");
var B = new ProductionModel("B");
var a = new StringLiteralLexerRule("a");
var b = new StringLiteralLexerRule("b");
var space = new StringLiteralLexerRule(" ");
S.AddWithAnd(A.LeftHandSide);
S.AddWithAnd(B.LeftHandSide);
S.AddWithOr(B.LeftHandSide);
A.AddWithAnd(new LexerRuleModel(a));
B.AddWithAnd(new LexerRuleModel(b));
grammarModel.Productions.Add(S);
grammarModel.Productions.Add(A);
grammarModel.Productions.Add(B);
grammarModel.IgnoreRules.Add(new LexerRuleModel(space));
grammarModel.Start = S;
var grammar = grammarModel.ToGrammar();
Assert.AreEqual(4, grammar.Productions.Count);
Assert.AreEqual(1, grammar.Ignores.Count);
}