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StringFormatter.cs
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StringFormatter.cs
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// MetaphysicsIndustries.Giza - A Parsing System
// Copyright (C) 2008-2022 Metaphysics Industries, Inc.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
// USA
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
namespace MetaphysicsIndustries.Giza
{
public static class StringFormatter
{
static StringFormatterGrammar _grammar;
static Spanner _spanner;
static StringFormatter()
{
_grammar = new StringFormatterGrammar();
_spanner = new Spanner(_grammar.def_format);
}
public static string Format(this string format, Func<string, string> values)
{
if (format == null) throw new ArgumentNullException("format");
if (values == null) throw new ArgumentNullException("values");
var errors = new List<Error>();
var spans = _spanner.Process(format.ToCharacterSource(), errors);
if (errors.ContainsNonWarnings())
{
throw new FormatException("format is invalid");
}
if (spans.Length < 1)
{
throw new InvalidOperationException("format produced no spans");
}
if (spans.Length > 1)
{
throw new FormatException("format is ambiguous");
}
var span = spans[0];
StringBuilder sb = new StringBuilder();
foreach (var item in span.Subspans)
{
if (item.DefRef == _grammar.def_text)
{
sb.Append(item.CollectValue());
}
else if (item.DefRef == _grammar.def_escape)
{
if (item.CollectValue() == "{{")
{
sb.Append("{");
}
else
{
sb.Append("}");
}
}
else if (item.DefRef == _grammar.def_param)
{
var name = (
from s in item.Subspans
where s.DefRef == _grammar.def_name
select s
).First();
var value = values(name.CollectValue());
if (value != null)
{
sb.Append(value);
}
else
{
sb.Append(item.CollectValue());
}
}
}
return sb.ToString();
}
public static string Format(this string format, IDictionary<string, string> values)
{
if (format == null) throw new ArgumentNullException("format");
if (values == null) throw new ArgumentNullException("values");
return Format(format, ((x) => (values.ContainsKey(x) ? values[x] : null)));
}
}
}