private static void TestAstParser()
{
// const string expression = "2! / (-1! + 0!)";
const string expression = "1*2-- -+-3 + (5 + 6)*7 + 2!!!! + (1+2*1)! + (2!)!!**(1+2)! + (1 - 1)!";
var l = new ArithmeticLexer(expression);
var p = new InfixToAstParser(l);
var e = p.Parse();
Console.WriteLine(e.ToString());
Console.WriteLine(e.Calculate());
}
public static IParseTree Parse(string input)
{
var str = new AntlrInputStream(input);
var lexer = new ArithmeticLexer(str);
Lexer = lexer;
var tokens = new CommonTokenStream(lexer);
TokenStream = tokens;
var parser = new ArithmeticParser(tokens);
Parser = parser;
var tree = parser.file_();
Tree = tree;
return(tree);
}
private static void TestLexer()
{
ILexer l = new ArithmeticLexer("1*2-3 + (5 + 6)*7");
var t = l.Current;
Console.WriteLine(t);
while (t.IsNot <EofToken>())
{
t = l.GetNext();
Console.WriteLine(t);
if (t != l.Current)
{
Console.WriteLine($"t ({t}) != l.Current ({l.Current})");
return;
}
}
}
static void Try(string input)
{
var str = new AntlrInputStream(input);
System.Console.WriteLine(input);
var lexer = new ArithmeticLexer(str);
var tokens = new CommonTokenStream(lexer);
var parser = new ArithmeticParser(tokens);
var listener_lexer = new ErrorListener <int>();
var listener_parser = new ErrorListener <IToken>();
lexer.AddErrorListener(listener_lexer);
parser.AddErrorListener(listener_parser);
var tree = parser.file();
if (listener_lexer.had_error || listener_parser.had_error)
{
System.Console.WriteLine("error in parse.");
}
else
{
System.Console.WriteLine("parse completed.");
}
}
static Antlr4.Runtime.Tree.IParseTree DoParse(string input)
{
bool show_tree = false;
bool show_tokens = false;
bool old = false;
bool two_byte = false;
string file_name = null;
System.Text.Encoding encoding = null;
ICharStream str = null;
if (input == null && file_name == null)
{
str = CharStreams.fromStream(System.Console.OpenStandardInput());
}
else if (input != null)
{
str = CharStreams.fromString(input);
}
else if (file_name != null)
{
if (two_byte)
{
str = new TwoByteCharStream(file_name);
}
else if (old)
{
FileStream fs = new FileStream(file_name, FileMode.Open);
str = new Antlr4.Runtime.AntlrInputStream(fs);
}
else if (encoding == null)
{
str = CharStreams.fromPath(file_name);
}
else
{
str = CharStreams.fromPath(file_name, encoding);
}
}
var lexer = new ArithmeticLexer(str);
if (show_tokens)
{
StringBuilder new_s = new StringBuilder();
for (int i = 0; ; ++i)
{
var ro_token = lexer.NextToken();
var token = (CommonToken)ro_token;
token.TokenIndex = i;
new_s.AppendLine(token.ToString());
if (token.Type == Antlr4.Runtime.TokenConstants.EOF)
{
break;
}
}
System.Console.Error.WriteLine(new_s.ToString());
lexer.Reset();
}
var tokens = new CommonTokenStream(lexer);
var parser = new ArithmeticParser(tokens);
var listener_lexer = new ErrorListener <int>();
var listener_parser = new ErrorListener <IToken>();
lexer.AddErrorListener(listener_lexer);
parser.AddErrorListener(listener_parser);
DateTime before = DateTime.Now;
ArithmeticParser.File_Context tree = parser.file_();
DateTime after = DateTime.Now;
System.Console.Error.WriteLine("Time: " + (after - before));
if (listener_lexer.had_error || listener_parser.had_error)
{
System.Console.Error.WriteLine("Parse failed.");
}
else
{
System.Console.Error.WriteLine("Parse succeeded.");
}
if (show_tree)
{
System.Console.Error.WriteLine(tree.ToStringTree(parser));
}
System.Environment.Exit(listener_lexer.had_error || listener_parser.had_error ? 1 : 0);
return(tree);
}
static void Main(string[] args)
{
bool show_tree = false;
bool show_tokens = false;
string file_name = null;
string input = null;
for (int i = 0; i < args.Length; ++i)
{
if (args[i].Equals("-tokens"))
{
show_tokens = true;
continue;
}
else if (args[i].Equals("-tree"))
{
show_tree = true;
continue;
}
else if (args[i].Equals("-input"))
{
input = args[++i];
}
else if (args[i].Equals("-file"))
{
file_name = args[++i];
}
}
ICharStream str = null;
if (input == null && file_name == null)
{
StringBuilder sb = new StringBuilder();
int ch;
while ((ch = System.Console.Read()) != -1)
{
sb.Append((char)ch);
}
input = sb.ToString();
str = CharStreams.fromString(input);
}
else if (input != null)
{
str = CharStreams.fromString(input);
}
else if (file_name != null)
{
str = CharStreams.fromPath(file_name);
}
var lexer = new ArithmeticLexer(str);
if (show_tokens)
{
StringBuilder new_s = new StringBuilder();
for (int i = 0; ; ++i)
{
var ro_token = lexer.NextToken();
var token = (CommonToken)ro_token;
token.TokenIndex = i;
new_s.AppendLine(token.ToString());
if (token.Type == Antlr4.Runtime.TokenConstants.EOF)
{
break;
}
}
System.Console.Error.WriteLine(new_s.ToString());
lexer.Reset();
}
var tokens = new CommonTokenStream(lexer);
var parser = new ArithmeticParser(tokens);
var listener_lexer = new ErrorListener <int>();
var listener_parser = new ErrorListener <IToken>();
lexer.AddErrorListener(listener_lexer);
parser.AddErrorListener(listener_parser);
var tree = parser.file();
if (listener_lexer.had_error || listener_parser.had_error)
{
System.Console.Error.WriteLine("parse failed.");
}
else
{
System.Console.Error.WriteLine("parse succeeded.");
}
if (show_tree)
{
System.Console.Error.WriteLine(tree.ToStringTree(parser));
}
System.Environment.Exit(listener_lexer.had_error || listener_parser.had_error ? 1 : 0);
}
