public static LRParser GetSLRParser(AugmentedGrammar grammar, Lexer lexer)
{
var parsingTableBuilder = new SLRParsingTableBuilder(lexer.TokensNumber);
parsingTableBuilder.SetGrammar(grammar);
parsingTableBuilder.ConstructParsingTable();
var parser = new LRParser
{
ParsingTable = parsingTableBuilder.GetTable(),
Lexer = lexer,
Grammar = grammar
};
return parser;
}
public void ArithmeticStatementFullyAutonomousParseTest()
{
const string INPUT = @"2*(3+4)";
string fileName = Path.GetTempFileName();
File.WriteAllText(fileName, INPUT);
RegExpTokenizer tokenizer = new RegExpTokenizer();
tokenizer.SetTransitionFunction(new TableDrivenTransitionFunction());
ILexer lexer = new Lexer(tokenizer);
Stream fileStream = File.OpenRead(fileName);
lexer.SetDataSource(fileStream);
var stack = new Stack<int>();
var parser = new LRParser();
var E = new NonTerminal("E");
var T = new NonTerminal("T");
var F = new NonTerminal("F");
var id = tokenizer.UseTerminal(RegExp.AtLeastOneOf(RegExp.Choice(
RegExp.Literal('0'), RegExp.Literal('1'), RegExp.Literal('2'),
RegExp.Literal('3'), RegExp.Literal('4'), RegExp.Literal('5'),
RegExp.Literal('6'), RegExp.Literal('7'), RegExp.Literal('8'),
RegExp.Literal('9'))));
var plus = tokenizer.UseTerminal(RegExp.Literal('+'));
var mult = tokenizer.UseTerminal(RegExp.Literal('*'));
var leftBrace = tokenizer.UseTerminal(RegExp.Literal('('));
var rightBrace = tokenizer.UseTerminal(RegExp.Literal(')'));
tokenizer.BuildTransitions();
var grammar = new AugmentedGrammar()
{
E --> E & plus & T ^ (v => stack.Push(stack.Pop() + stack.Pop())),
E --> T,
T --> T & mult & F ^ (v => stack.Push(stack.Pop() * stack.Pop())),
T --> F,
F --> leftBrace & E & rightBrace,
F --> id ^ (v => stack.Push(v[id].AsInt()))
};
Console.WriteLine("Grammar is being tested: \n{0}", grammar);
Console.WriteLine("Input is being parsed: {0}\n", INPUT);
Console.WriteLine("Parsing process:\n");
parser.Grammar = grammar;
parser.Lexer = lexer;
var ptBuilder = new SLRParsingTableBuilder();
ptBuilder.SetGrammar(grammar);
ptBuilder.ConstructParsingTable();
parser.ParsingTable = ptBuilder.GetTable();
parser.InputAccepted += (sender, eventArgs) => Console.WriteLine("Accepted!");
parser.ParseInput();
Assert.That(stack.Pop(), Is.EqualTo(14));
Assert.That(stack.Count, Is.EqualTo(0));
fileStream.Close();
File.Delete(fileName);
}
public void ArithmeticStatementParseTest()
{
const string INPUT = @"2*(3+4)";//@"2*(3+4)$"
ActionTableEntry[,] actionTable;
int[,] gotoTable;
string fileName;
ILexer lexer;
Stream fileStream;
RegExpTokenizer tokenizer;
fileName = Path.GetTempFileName();
File.WriteAllText(fileName, INPUT);
tokenizer = new RegExpTokenizer();
tokenizer.SetTransitionFunction(new TableDrivenTransitionFunction());
lexer = new Lexer(tokenizer);
fileStream = File.OpenRead(fileName);
lexer.SetDataSource(fileStream);
actionTable = new ActionTableEntry[12, 6];
#region Populating Action Table
actionTable[0, 1].Action = ParserAction.Shift;
actionTable[0, 1].Destination = 5;
actionTable[0, 4].Action = ParserAction.Shift;
actionTable[0, 4].Destination = 4;
actionTable[1, 0].Action = ParserAction.Accept; // <-- !!!!
actionTable[1, 2].Action = ParserAction.Shift;
actionTable[1, 2].Destination = 6;
actionTable[2, 0].Action = ParserAction.Reduce;
actionTable[2, 0].Destination = 2;
actionTable[2, 2].Action = ParserAction.Reduce;
actionTable[2, 2].Destination = 2;
actionTable[2, 3].Action = ParserAction.Shift;
actionTable[2, 3].Destination = 7;
actionTable[2, 5].Action = ParserAction.Reduce;
actionTable[2, 5].Destination = 2;
actionTable[3, 0].Action = ParserAction.Reduce;
actionTable[3, 0].Destination = 4;
actionTable[3, 2].Action = ParserAction.Reduce;
actionTable[3, 2].Destination = 4;
actionTable[3, 3].Action = ParserAction.Reduce;
actionTable[3, 3].Destination = 4;
actionTable[3, 5].Action = ParserAction.Reduce;
actionTable[3, 5].Destination = 4;
actionTable[4, 1].Action = ParserAction.Shift;
actionTable[4, 1].Destination = 5;
actionTable[4, 4].Action = ParserAction.Shift;
actionTable[4, 4].Destination = 4;
actionTable[5, 0].Action = ParserAction.Reduce;
actionTable[5, 0].Destination = 6;
actionTable[5, 2].Action = ParserAction.Reduce;
actionTable[5, 2].Destination = 6;
actionTable[5, 3].Action = ParserAction.Reduce;
actionTable[5, 3].Destination = 6;
actionTable[5, 5].Action = ParserAction.Reduce;
actionTable[5, 5].Destination = 6;
actionTable[6, 1].Action = ParserAction.Shift;
actionTable[6, 1].Destination = 5;
actionTable[6, 4].Action = ParserAction.Shift;
actionTable[6, 4].Destination = 4;
actionTable[7, 1].Action = ParserAction.Shift;
actionTable[7, 1].Destination = 5;
actionTable[7, 4].Action = ParserAction.Shift;
actionTable[7, 4].Destination = 4;
actionTable[8, 2].Action = ParserAction.Shift;
actionTable[8, 2].Destination = 6;
actionTable[8, 5].Action = ParserAction.Shift;
actionTable[8, 5].Destination = 11;
actionTable[9, 0].Action = ParserAction.Reduce;
actionTable[9, 0].Destination = 1;
actionTable[9, 2].Action = ParserAction.Reduce;
actionTable[9, 2].Destination = 1;
actionTable[9, 3].Action = ParserAction.Shift;
actionTable[9, 3].Destination = 7;
actionTable[9, 5].Action = ParserAction.Reduce;
actionTable[9, 5].Destination = 1;
actionTable[10, 0].Action = ParserAction.Reduce;
actionTable[10, 0].Destination = 3;
actionTable[10, 2].Action = ParserAction.Reduce;
actionTable[10, 2].Destination = 3;
actionTable[10, 3].Action = ParserAction.Reduce;
actionTable[10, 3].Destination = 3;
actionTable[10, 5].Action = ParserAction.Reduce;
actionTable[10, 5].Destination = 3;
actionTable[11, 0].Action = ParserAction.Reduce;
actionTable[11, 0].Destination = 5;
actionTable[11, 2].Action = ParserAction.Reduce;
actionTable[11, 2].Destination = 5;
actionTable[11, 3].Action = ParserAction.Reduce;
actionTable[11, 3].Destination = 5;
actionTable[11, 5].Action = ParserAction.Reduce;
actionTable[11, 5].Destination = 5;
//actionTable[0, 0].Action = ParserAction.Shift;
//actionTable[0, 0].Destination = 5;
//actionTable[0, 3].Action = ParserAction.Shift;
//actionTable[0, 3].Destination = 4;
//actionTable[1, 1].Action = ParserAction.Shift;
//actionTable[1, 1].Destination = 6;
//actionTable[1, 5].Action = ParserAction.Accept; // <-- !!!!
//actionTable[2, 1].Action = ParserAction.Reduce;
//actionTable[2, 1].Destination = 2;
//actionTable[2, 2].Action = ParserAction.Shift;
//actionTable[2, 2].Destination = 7;
//actionTable[2, 4].Action = ParserAction.Reduce;
//actionTable[2, 4].Destination = 2;
//actionTable[2, 5].Action = ParserAction.Reduce;
//actionTable[2, 5].Destination = 2;
//actionTable[3, 1].Action = ParserAction.Reduce;
//actionTable[3, 1].Destination = 4;
//actionTable[3, 2].Action = ParserAction.Reduce;
//actionTable[3, 2].Destination = 4;
//actionTable[3, 4].Action = ParserAction.Reduce;
//actionTable[3, 4].Destination = 4;
//actionTable[3, 5].Action = ParserAction.Reduce;
//actionTable[3, 5].Destination = 4;
//actionTable[4, 0].Action = ParserAction.Shift;
//actionTable[4, 0].Destination = 5;
//actionTable[4, 3].Action = ParserAction.Shift;
//actionTable[4, 3].Destination = 4;
//actionTable[5, 1].Action = ParserAction.Reduce;
//actionTable[5, 1].Destination = 6;
//actionTable[5, 2].Action = ParserAction.Reduce;
//actionTable[5, 2].Destination = 6;
//actionTable[5, 4].Action = ParserAction.Reduce;
//actionTable[5, 4].Destination = 6;
//actionTable[5, 5].Action = ParserAction.Reduce;
//actionTable[5, 5].Destination = 6;
//actionTable[6, 0].Action = ParserAction.Shift;
//actionTable[6, 0].Destination = 5;
//actionTable[6, 3].Action = ParserAction.Shift;
//actionTable[6, 3].Destination = 4;
//actionTable[7, 0].Action = ParserAction.Shift;
//actionTable[7, 0].Destination = 5;
//actionTable[7, 3].Action = ParserAction.Shift;
//actionTable[7, 3].Destination = 4;
//actionTable[8, 1].Action = ParserAction.Shift;
//actionTable[8, 1].Destination = 6;
//actionTable[8, 4].Action = ParserAction.Shift;
//actionTable[8, 4].Destination = 11;
//actionTable[9, 1].Action = ParserAction.Reduce;
//actionTable[9, 1].Destination = 1;
//actionTable[9, 2].Action = ParserAction.Shift;
//actionTable[9, 2].Destination = 7;
//actionTable[9, 4].Action = ParserAction.Reduce;
//actionTable[9, 4].Destination = 1;
//actionTable[9, 5].Action = ParserAction.Reduce;
//actionTable[9, 5].Destination = 1;
//actionTable[10, 1].Action = ParserAction.Reduce;
//actionTable[10, 1].Destination = 3;
//actionTable[10, 2].Action = ParserAction.Reduce;
//actionTable[10, 2].Destination = 3;
//actionTable[10, 4].Action = ParserAction.Reduce;
//actionTable[10, 4].Destination = 3;
//actionTable[10, 5].Action = ParserAction.Reduce;
//actionTable[10, 5].Destination = 3;
//actionTable[11, 1].Action = ParserAction.Reduce;
//actionTable[11, 1].Destination = 5;
//actionTable[11, 2].Action = ParserAction.Reduce;
//actionTable[11, 2].Destination = 5;
//actionTable[11, 4].Action = ParserAction.Reduce;
//actionTable[11, 4].Destination = 5;
//actionTable[11, 5].Action = ParserAction.Reduce;
//actionTable[11, 5].Destination = 5;
#endregion
gotoTable = new int[12, 3];
#region Populating Goto Table
gotoTable[0, 0] = 1;
gotoTable[0, 1] = 2;
gotoTable[0, 2] = 3;
gotoTable[4, 0] = 8;
gotoTable[4, 1] = 2;
gotoTable[4, 2] = 3;
gotoTable[6, 1] = 9;
gotoTable[6, 2] = 3;
gotoTable[7, 2] = 10;
#endregion
var stack = new Stack<int>();
var parser = new LRParser();
var E = new NonTerminal("E");
var T = new NonTerminal("T");
var F = new NonTerminal("F");
var id = tokenizer.UseTerminal(RegExp.AtLeastOneOf(RegExp.Choice(
RegExp.Literal('0'), RegExp.Literal('1'), RegExp.Literal('2'),
RegExp.Literal('3'), RegExp.Literal('4'), RegExp.Literal('5'),
RegExp.Literal('6'), RegExp.Literal('7'), RegExp.Literal('8'),
RegExp.Literal('9'))));
var plus = tokenizer.UseTerminal(RegExp.Literal('+'));
var mult = tokenizer.UseTerminal(RegExp.Literal('*'));
var leftBrace = tokenizer.UseTerminal(RegExp.Literal('('));
var rightBrace = tokenizer.UseTerminal(RegExp.Literal(')'));
tokenizer.BuildTransitions();
var grammar = new AugmentedGrammar()
{
E --> E & plus & T ^ (v => stack.Push(stack.Pop() + stack.Pop())),
E --> T,
T --> T & mult & F ^ (v => stack.Push(stack.Pop() * stack.Pop())),
T --> F,
F --> leftBrace & E & rightBrace,
F --> id ^ (v => stack.Push(v[id].AsInt()))
};
Console.WriteLine("Grammar is being tested: \n{0}", grammar);
Console.WriteLine("Input is being parsed: {0}\n", INPUT);
Console.WriteLine("Parsing process:\n");
parser.Grammar = grammar;
parser.Lexer = lexer;
parser.ParsingTable = new LRParsingTable(actionTable, gotoTable);
parser.InputAccepted += (sender, eventArgs) => Console.WriteLine("Accepted!");
parser.ParseInput();
Assert.That(stack.Pop(), Is.EqualTo(14));
Assert.That(stack.Count, Is.EqualTo(0));
fileStream.Close();
File.Delete(fileName);
}