public static Func <IReadOnlyList <ExpressionTerm>, decimal> EvaluateExpression(string expression)
{
using (var stringReader = new StringReader(expression))
{
var inputStream = new AntlrInputStream(stringReader);
var lexer = new MyGrammarLexer(inputStream);
var tokens = new CommonTokenStream(lexer);
var parser = new MyGrammarParser(tokens);
var expressionTree = parser.expr();// lets call the parser on the whole thing
var visitor = new MyGrammarExpressionVisitor();
var func = visitor.Visit(expressionTree);
return(func);
}
}
public static (Func <IReadOnlyList <IGrammarTerm>, decimal> function, IReadOnlyList <IGrammarTerm> rawTerms) EvaluateExpression(string expression)
{
using (var stringReader = new StringReader(expression))
{
var inputStream = new AntlrInputStream(stringReader);
var lexer = new MyGrammarLexer(inputStream);
var tokens = new CommonTokenStream(lexer);
var parser = new MyGrammarParser(tokens);
var expressionTree = parser.expr();// lets parse the whole thing
var visitor = new MyGrammarExpressionVisitor();
// now that we have a "parsed expression" let's visit all the nodes.
var func = visitor.Visit(expressionTree);
return(func, visitor.Terms);
}
}