/// <summary>
/// Evaluates a derivation of the form:
/// Expression= Expression add Expression | Expression sub Expression | integer
/// </summary>
/// <remarks>
/// The production rules are:
/// Expression -> Expression add Expression
/// Expression -> Expression sub Expression
/// Expression -> integer
/// </remarks>
/// <param name="node">The <see cref="ParseNode"/> to evaluate</param>
/// <param name="state">A user supplied state object. What it should be depends on the production's associated code block</param>
/// <returns>The result of the evaluation</returns>
internal static int EvaluateExpression(ParseNode node, object state)
{
if ((GloryDemo.Test2Parser.integer == node.SymbolId))
{
return((int)(Test2Parser._ChangeType(node.Value, typeof(int))));
}
if ((false == node.IsNonTerminal))
{
return((int)(Test2Parser._ChangeType(0, typeof(int))));
}
int result = Test2Parser.EvaluateExpression(node.Children[0], state);
int i = 2;
for (
; (i < node.Children.Length);
)
{
if ((node.Children[(i - 1)].SymbolId == GloryDemo.Test2Parser.add))
{
result = (result + Test2Parser.EvaluateExpression(node.Children[i], state));
}
else
{
result = (result - Test2Parser.EvaluateExpression(node.Children[i], state));
}
i = (i + 2);
}
return((int)(Test2Parser._ChangeType(result, typeof(int))));
}
static void Main(string[] args)
{
string input;
//using (var sr = new StreamReader(@"..\..\data2.json"))
// input = sr.ReadToEnd();
input = "d+d+d+d";
var test1Tokenizer = new Test1Tokenizer(input);
var test1Parser = new Test1Parser(test1Tokenizer);
foreach (var pt in test1Parser.ParseReductions(false, true, false))
{
Console.WriteLine(pt.ToString("t"));
Console.WriteLine();
}
input = "1+3*-5";
var expressionTokenizer = new ExpressionTokenizer(input);
var expressionParser = new ExpressionParser(expressionTokenizer);
foreach (var pt in expressionParser.ParseReductions())
{
Console.WriteLine(pt.ToString("t"));
Console.WriteLine();
Console.WriteLine(ExpressionParser.Evaluate(pt));
}
Console.WriteLine();
input = "1+5-3+2";
var test2Tokenizer = new Test2Tokenizer(input);
var test2Parser = new Test2Parser(test2Tokenizer);
foreach (var pt in test2Parser.ParseReductions())
{
if (!pt.HasErrors)
{
Console.WriteLine(pt.ToString("t"));
Console.WriteLine();
Console.WriteLine(Test2Parser.Evaluate(pt));
}
}
input = "(int)foo.bar * baz";
var seTokenizer = new SlangExpressionTokenizer(input);
var seParser = new SlangExpressionParser(seTokenizer);
foreach (var pt in seParser.ParseReductions())
{
if (!pt.HasErrors)
{
Console.WriteLine(pt.ToString("t"));
Console.WriteLine();
}
}
}
/// <summary>
/// Evaluates a derivation of the form:
/// Expression= Expression add Expression | Expression sub Expression | integer
/// </summary>
/// <remarks>
/// The production rules are:
/// Expression -> Expression add Expression
/// Expression -> Expression sub Expression
/// Expression -> integer
/// </remarks>
/// <param name="node">The <see cref="ParseNode"/> to evaluate</param>
/// <param name="state">A user supplied state object. What it should be depends on the production's associated code block</param>
/// <returns>The result of the evaluation</returns>
public static int Evaluate(ParseNode node, object state)
{
return(Test2Parser.EvaluateExpression(node, state));
}
/// <summary>
/// Evaluates a derivation of the form:
/// Expression= Expression add Expression | Expression sub Expression | integer
/// </summary>
/// <remarks>
/// The production rules are:
/// Expression -> Expression add Expression
/// Expression -> Expression sub Expression
/// Expression -> integer
/// </remarks>
/// <param name="node">The <see cref="ParseNode"/> to evaluate</param>
/// <returns>The result of the evaluation</returns>
public static int Evaluate(ParseNode node)
{
return(Test2Parser.EvaluateExpression(node, null));
}
