/
GrammarRule.cs
47 lines (36 loc) · 1.12 KB
/
GrammarRule.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
using Lexepars.Parsers;
using System;
namespace Lexepars
{
public class GrammarRule<T> : Parser<T>, INamedInternal
{
private IParser<T> _parser;
public GrammarRule(string name = null)
{
_name = name;
}
protected override string BuildExpression() => _parser?.Expression;
void INamedInternal.SetName(string name)
{
_name = name;
}
private string _name;
public IParser<T> Rule
{
get => _parser;
set
{
if (_parser != null)
throw new InvalidOperationException($"Rule {Expression} is already initialized with {_parser.Expression}.");
_parser = value ?? throw new ArgumentNullException(nameof(value));
}
}
public string Name => _name ?? Expression;
public override IReply<T> Parse(TokenStream tokens)
{
if (_parser == null)
throw new InvalidOperationException($"Rule {Expression} is not initialized.");
return _parser.Parse(tokens);
}
}
}