private static string GetFirstSymbol(Bamboo.Parsing.Grammars.Expression expression)
{
if (expression is Bamboo.Parsing.Grammars.Symbol)
{
Bamboo.Parsing.Grammars.Symbol symbol = (Bamboo.Parsing.Grammars.Symbol)expression;
return(symbol.Token);
}
else if (expression is Bamboo.Parsing.Grammars.Concatenation)
{
Bamboo.Parsing.Grammars.Concatenation concatenation = (Bamboo.Parsing.Grammars.Concatenation)expression;
return(GetFirstSymbol(concatenation.Expressions[0]));
}
else
{
throw new System.Exception("INVALID");
}
}
private static List <Bamboo.Parsing.Grammars.Expression> ToList(Bamboo.Parsing.Grammars.Expression expression)
{
List <Bamboo.Parsing.Grammars.Expression> list = new List <Bamboo.Parsing.Grammars.Expression>();
if (expression is Bamboo.Parsing.Grammars.Symbol)
{
Bamboo.Parsing.Grammars.Symbol symbol = (Bamboo.Parsing.Grammars.Symbol)expression;
list.Add(symbol);
}
else if (expression is Bamboo.Parsing.Grammars.Concatenation)
{
Bamboo.Parsing.Grammars.Concatenation concatenation = (Bamboo.Parsing.Grammars.Concatenation)expression;
foreach (Bamboo.Parsing.Grammars.Symbol symbol in concatenation.Expressions)
{
list.Add(symbol);
}
}
else
{
throw new System.Exception("INVALID");
}
return(list);
}
private static bool CanResolve(Bamboo.Parsing.Grammars.Expression expression, List <Bamboo.Parsing.Grammars.Production> remaining)
{
if (expression is Bamboo.Parsing.Grammars.Symbol)
{
Bamboo.Parsing.Grammars.Symbol symbol = (Bamboo.Parsing.Grammars.Symbol)expression;
foreach (Bamboo.Parsing.Grammars.Production production in remaining)
{
if (production.Nonterminal.Equals(symbol.Token))
{
return(false);
}
}
return(true);
}
else if (expression is Bamboo.Parsing.Grammars.Concatenation)
{
Bamboo.Parsing.Grammars.Concatenation concatenation = (Bamboo.Parsing.Grammars.Concatenation)expression;
return(CanResolve(concatenation.Expressions[0], remaining));
}
else
{
throw new System.Exception("INVALID");
}
}
public static void Generate(string name, string nspace, Bamboo.Parsing.Grammars.Grammar grammar, System.IO.TextWriter writer)
{
writer.WriteLine("//");
writer.WriteLine("// AUTOGENERATED " + System.DateTime.Now + "");
writer.WriteLine("//");
writer.WriteLine("using System;");
writer.WriteLine("");
writer.WriteLine("namespace " + nspace + "");
writer.WriteLine("{");
writer.WriteLine(" public abstract class "+ name + "Evaluator");
writer.WriteLine(" {");
writer.WriteLine("");
writer.WriteLine(" public "+ name + "Evaluator()");
writer.WriteLine(" {");
writer.WriteLine(" }");
writer.WriteLine("");
writer.WriteLine(" public object Evaluate("+ name + "Node node)");
writer.WriteLine(" {");
writer.WriteLine(" switch (node.Type)");
writer.WriteLine(" {");
foreach (string nonterminal in grammar.Nonterminals)
{
writer.WriteLine(" case "+ name + "NodeType." + nonterminal + ":");
writer.WriteLine(" {");
foreach (Bamboo.Parsing.Grammars.Production production in GetProductions(nonterminal, grammar))
{
if (production.Expression is Bamboo.Parsing.Grammars.Concatenation)
{
Bamboo.Parsing.Grammars.Concatenation concatenation = (Bamboo.Parsing.Grammars.Concatenation)production.Expression;
string tag = "";
writer.Write(" if(");
writer.Write("node.Nodes.Count == " + concatenation.Expressions.Count);
int i = 0;
foreach (Bamboo.Parsing.Grammars.Symbol symbol in concatenation.Expressions)
{
tag += symbol.Token;
writer.Write(" && node.Nodes[" + i + "].Type == " + name + "NodeType." + symbol.Token + "");
i++;
}
writer.WriteLine(")");
writer.WriteLine(" {");
writer.WriteLine(" return Evaluate"+ tag + "(node);");
writer.WriteLine(" }");
}
else if (production.Expression is Bamboo.Parsing.Grammars.Symbol)
{
Bamboo.Parsing.Grammars.Symbol symbol = (Bamboo.Parsing.Grammars.Symbol)production.Expression;
if (!symbol.Token.Equals("EPSILON"))
{
string tag = symbol.Token;
writer.Write(" if(");
writer.Write("node.Nodes.Count == 1");
writer.Write(" && node.Nodes[0].Type == " + name + "NodeType." + symbol.Token + "");
writer.WriteLine(")");
writer.WriteLine(" {");
if (grammar.Terminals.Contains(symbol.Token))
{
writer.WriteLine(" return Evaluate"+ tag + "(node.Nodes[0].Value);");
}
else
{
writer.WriteLine(" return Evaluate"+ tag + "(node.Nodes[0]);");
}
writer.WriteLine(" }");
}
}
else
{
throw new System.Exception("Invalid expression.");
}
}
writer.WriteLine(" throw new System.Exception(\"Invalid expression.\");");
writer.WriteLine(" }");
}
foreach (string terminal in grammar.Terminals)
{
if (!terminal.Equals("EPSILON"))
{
writer.WriteLine(" case "+ name + "NodeType." + terminal + ":");
writer.WriteLine(" {");
writer.WriteLine(" return Evaluate"+ terminal + "(node.Value);");
writer.WriteLine(" }");
}
}
writer.WriteLine(" default:");
writer.WriteLine(" {");
writer.WriteLine(" throw new System.Exception(\"Invalid expression.\");");
writer.WriteLine(" }");
writer.WriteLine(" }");
writer.WriteLine(" }");
writer.WriteLine("");
Surf.Set functions = new Surf.Set();
functions.Define("EPSILON", "EPSILON");
foreach (string nonterminal in grammar.Nonterminals)
{
foreach (Bamboo.Parsing.Grammars.Production production in GetProductions(nonterminal, grammar))
{
string tag = "";
if (production.Expression is Bamboo.Parsing.Grammars.Concatenation)
{
Bamboo.Parsing.Grammars.Concatenation concatenation = (Bamboo.Parsing.Grammars.Concatenation)production.Expression;
foreach (Bamboo.Parsing.Grammars.Symbol symbol in concatenation.Expressions)
{
tag += symbol.Token;
}
if (!functions.IsDefined(tag))
{
writer.WriteLine(" protected virtual object Evaluate"+ tag + "(" + name + "Node node)");
writer.WriteLine(" {");
writer.WriteLine(" throw new System.Exception(\"Implement.\");");
writer.WriteLine(" }");
writer.WriteLine("");
functions.Define(tag, tag);
}
}
else if (production.Expression is Bamboo.Parsing.Grammars.Symbol)
{
Bamboo.Parsing.Grammars.Symbol symbol = (Bamboo.Parsing.Grammars.Symbol)production.Expression;
tag += symbol.Token;
if (!functions.IsDefined(tag))
{
if (grammar.Terminals.Contains(symbol.Token))
{
writer.WriteLine(" protected virtual object Evaluate"+ tag + "(string value)");
}
else
{
writer.WriteLine(" protected virtual object Evaluate"+ tag + "(" + name + "Node node)");
}
writer.WriteLine(" {");
writer.WriteLine(" throw new System.Exception(\"Implement.\");");
writer.WriteLine(" }");
writer.WriteLine("");
functions.Define(tag, tag);
}
}
else
{
throw new System.Exception("Invalid expression.");
}
}
}
foreach (string terminal in grammar.Terminals)
{
if (!functions.IsDefined(terminal))
{
writer.WriteLine(" protected virtual object Evaluate"+ terminal + "(string value)");
writer.WriteLine(" {");
writer.WriteLine(" throw new System.Exception(\"Implement.\");");
writer.WriteLine(" }");
writer.WriteLine("");
functions.Define(terminal, terminal);
}
}
writer.WriteLine(" }");
writer.WriteLine("}");
}
public static void GenerateClass(string name, string multinamespace, Bamboo.Parsing.Grammars.Grammar grammar, Surf.Set FIRST, Surf.Set FOLLOW, Surf.Set PREDICT, System.IO.TextWriter writer)
{
writer.WriteLine("//");
writer.WriteLine("// " + name + "Parser.cpp");
writer.WriteLine("//");
writer.WriteLine("// AUTOGENERATED " + System.DateTime.Now + "");
writer.WriteLine("//");
writer.WriteLine("");
writer.WriteLine("#include <istream>");
writer.WriteLine("#include <sstream>");
writer.WriteLine("#include <string>");
writer.WriteLine("#include <vector>");
writer.WriteLine("#include \"" + name + "Parser.h\"");
writer.WriteLine("#include \"" + name + "Token.h\"");
writer.WriteLine("#include \"" + name + "TokenType.h\"");
writer.WriteLine("");
string[] namespaces = multinamespace.Split(new string[] { "::" }, StringSplitOptions.None);
foreach (string nspace in namespaces)
{
writer.WriteLine("namespace " + nspace + "");
writer.WriteLine("{");
}
writer.WriteLine(" void Parser::next("+ name + "Token& token)");
writer.WriteLine(" {");
writer.WriteLine(" start:");
writer.WriteLine(" switch(_currentState)");
writer.WriteLine(" {");
Dictionary <string, int> states = new Dictionary <string, int>();
int state = 0;
foreach (string nonterminal in grammar.Nonterminals)
{
states.Add(nonterminal, state++);
}
foreach (string terminal in grammar.Terminals)
{
if (terminal != "EPSILON")
{
states.Add(terminal, state++);
}
}
foreach (string nonterminal in grammar.Nonterminals)
{
bool hasDefault = false;
writer.WriteLine(" case "+ states[nonterminal] + ": // parse" + nonterminal);
writer.WriteLine(" {");
writer.WriteLine(" switch(token.type())");
writer.WriteLine(" {");
int state2 = state;
foreach (Surf.Tuple tuple in PREDICT)
{
int n = (int)tuple[0] + 1;
Bamboo.Parsing.Grammars.Production production = (Bamboo.Parsing.Grammars.Production)tuple[1];
Surf.Set predict = (Surf.Set)tuple[2];
if (production.Nonterminal.Equals(nonterminal))
{
foreach (string symbol in predict)
{
List <Bamboo.Parsing.Grammars.Expression> expressions = ToList(production.Expression);
if (expressions.Count == 1 && ((Bamboo.Parsing.Grammars.Symbol)expressions[0]).Token == "EPSILON")
{
hasDefault = true;
}
else
{
writer.WriteLine(" case TokenType::"+ symbol + ":");
writer.WriteLine(" {");
writer.Write(" beginParse"+ nonterminal);
foreach (Bamboo.Parsing.Grammars.Symbol expression in expressions)
{
writer.Write("_" + expression.Token);
}
writer.WriteLine("();");
writer.Write(" _states.push_back("+ state2++ + "); // endParse" + nonterminal);
foreach (Bamboo.Parsing.Grammars.Symbol expression in expressions)
{
writer.Write("_" + expression.Token);
}
writer.WriteLine("();");
for (int i = (expressions.Count - 1); i >= 1; i--)
{
Bamboo.Parsing.Grammars.Symbol expression = (Bamboo.Parsing.Grammars.Symbol)expressions[i];
writer.WriteLine(" _states.push_back("+ states[expression.Token] + "); // parse" + expression.Token);
}
Bamboo.Parsing.Grammars.Symbol expression2 = (Bamboo.Parsing.Grammars.Symbol)expressions[0];
writer.WriteLine(" _currentState = "+ states[expression2.Token] + "; // parse" + expression2.Token);
writer.WriteLine(" goto start;");
writer.WriteLine(" break;");
writer.WriteLine(" }");
}
}
}
}
if (states[nonterminal] == 0)
{
writer.WriteLine(" case "+ name + "TokenType::_EOF_:");
writer.WriteLine(" {");
writer.WriteLine(" if (_states.size() > 0)");
writer.WriteLine(" {");
writer.WriteLine(" _currentState = _states.back();");
writer.WriteLine(" _states.pop_back();");
writer.WriteLine(" goto start;");
writer.WriteLine(" }");
writer.WriteLine(" break;");
writer.WriteLine(" }");
}
if (hasDefault)
{
writer.WriteLine(" default:");
writer.WriteLine(" {");
writer.WriteLine(" // EPSILON");
writer.WriteLine(" _currentState = _states.back();");
writer.WriteLine(" _states.pop_back();");
writer.WriteLine(" goto start;");
writer.WriteLine(" }");
}
else
{
writer.WriteLine(" default:");
writer.WriteLine(" {");
writer.WriteLine(" std::stringstream stream;");
writer.WriteLine(" stream << __FILE__ << \" \" << __LINE__ << \" \" << \"Syntax error.\";");
writer.WriteLine(" throw stream.str();");
writer.WriteLine(" }");
}
writer.WriteLine(" }");
writer.WriteLine(" break;");
writer.WriteLine(" }");
state2 = state;
foreach (Surf.Tuple tuple in PREDICT)
{
int n = (int)tuple[0] + 1;
Bamboo.Parsing.Grammars.Production production = (Bamboo.Parsing.Grammars.Production)tuple[1];
Surf.Set predict = (Surf.Set)tuple[2];
if (production.Nonterminal.Equals(nonterminal))
{
foreach (string symbol in predict)
{
List <Bamboo.Parsing.Grammars.Expression> expressions = ToList(production.Expression);
if (expressions.Count == 1 && ((Bamboo.Parsing.Grammars.Symbol)expressions[0]).Token == "EPSILON")
{
}
else
{
writer.Write(" case "+ state2++ + ": // endParse" + nonterminal);
foreach (Bamboo.Parsing.Grammars.Symbol expression in expressions)
{
writer.Write("_" + expression.Token);
}
writer.WriteLine("();");
writer.WriteLine(" {");
writer.Write(" "+ "endParse" + nonterminal);
foreach (Bamboo.Parsing.Grammars.Symbol expression in expressions)
{
writer.Write("_" + expression.Token);
}
writer.WriteLine("();");
writer.WriteLine(" if (_states.size() == 0)");
writer.WriteLine(" {");
writer.WriteLine(" _currentState = 0;");
writer.WriteLine(" }");
writer.WriteLine(" else");
writer.WriteLine(" {");
writer.WriteLine(" _currentState = _states.back();");
writer.WriteLine(" _states.pop_back();");
writer.WriteLine(" }");
writer.WriteLine(" goto start;");
writer.WriteLine(" break;");
writer.WriteLine(" }");
}
}
}
}
state = state2;
}
foreach (string terminal in grammar.Terminals)
{
if (terminal != "EPSILON")
{
writer.WriteLine(" case "+ states[terminal] + ": // " + terminal);
writer.WriteLine(" {");
writer.WriteLine(" parse"+ terminal + "(token);");
writer.WriteLine(" if (_states.size() == 0)");
writer.WriteLine(" {");
writer.WriteLine(" _currentState = 0;");
writer.WriteLine(" }");
writer.WriteLine(" else");
writer.WriteLine(" {");
writer.WriteLine(" _currentState = _states.back();");
writer.WriteLine(" _states.pop_back();");
writer.WriteLine(" }");
writer.WriteLine(" break;");
writer.WriteLine(" }");
}
}
writer.WriteLine(" default:");
writer.WriteLine(" {");
writer.WriteLine(" std::stringstream stream;");
writer.WriteLine(" stream << __FILE__ << \" \" << __LINE__ << \" \" << \"Invalid parser state.\";");
writer.WriteLine(" throw stream.str();");
writer.WriteLine(" }");
writer.WriteLine(" }");
writer.WriteLine(" }");
writer.WriteLine("");
foreach (string nspace in namespaces)
{
writer.WriteLine("}");
}
}
