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LL1GenericParsingTable.cs
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LL1GenericParsingTable.cs
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using System;
using System.Linq;
using System.Text.Json;
using System.Collections.Generic;
using System.Globalization;
using CNFDotnet.Analysis.Grammar;
using CNFDotnet.Analysis.Parsing;
using CNFDotnet.Analysis.Parsing.LL;
namespace CNFDotnet.Tests
{
public class LL1GenericParsingTable : BaseGenericParsingTable<LL1Action>
{
public LL1GenericParsingTable(params GenericParsingTableItem[] items)
: base(items)
{ }
public LL1GenericParsingTable(string json)
: base(json)
{ }
public override void Verify
(CNFGrammar cnfGrammar, IParsingTable<LL1Action> generatedTable)
{
LL1Action foundAction;
int productionIndex;
GenericParsingTableItem foundItem;
foreach(GenericParsingTableItem item in this.Items)
{
productionIndex = int.Parse
(
item.Action,
CultureInfo.InvariantCulture
);
foundAction = generatedTable.SingleOrDefault
(
x => string.Equals
(
x.Terminal,
item.Column,
StringComparison.Ordinal
)
&& string.Equals
(
x.NonTerminal,
item.Row,
StringComparison.Ordinal
)
&& x.Production.Index == productionIndex
);
if(foundAction is null)
{
throw new VerifcationException($"{item} not found!");
}
}
foreach(LL1Action action in generatedTable)
{
foundItem = this.Items.SingleOrDefault
(
x => string.Equals
(
action.Terminal,
x.Column,
StringComparison.Ordinal
)
&& string.Equals
(
action.NonTerminal,
x.Row,
StringComparison.Ordinal
)
&& action.Production.Index == int.Parse
(
x.Action,
CultureInfo.InvariantCulture
)
);
if(foundItem is null)
{
throw new VerifcationException(action.ToString());
}
}
}
protected override GenericParsingTableItem[] ParseJSON
(string json)
{
List<GenericParsingTableItem> lst
= new List<GenericParsingTableItem>();
string row, column, index;
using(JsonDocument doc = JsonDocument.Parse(json))
{
JsonElement root = doc.RootElement;
foreach(JsonProperty tableRow in root.EnumerateObject())
{
row = tableRow.Name;
foreach(JsonProperty cell
in tableRow.Value.EnumerateObject())
{
column = cell.Name;
if(string.Equals
(
column,
"Grammar.END",
StringComparison.Ordinal
))
{
column = "$";
}
foreach(JsonElement prod
in cell.Value.EnumerateArray())
{
index = prod
.GetInt32()
.ToString(CultureInfo.InvariantCulture);
lst.Add((row, column, index));
//yield return (row, column, index);
}
}
}
}
return lst.ToArray();
}
}
}