TomlParser.cs
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using System;
using System.Collections.Generic;
namespace UniJSON
{
public static class TomlParser
{
static TomlValue ParseLHS(Utf8String segment, int parentIndex)
{
var it = segment.GetIterator();
while (it.MoveNext())
{
if (it.Current == '"')
{
throw new NotImplementedException();
}
else if (it.Current == '.')
{
throw new NotImplementedException();
}
else if (it.Current == ' ' || it.Current == '\t' || it.Current == '=')
{
return new TomlValue(segment.Subbytes(0, it.BytePosition),
TomlValueType.BareKey, parentIndex);
}
}
throw new NotImplementedException();
}
static TomlValue ParseRHS(Utf8String segment, int parentIndex)
{
switch ((char)segment[0])
{
case '+':
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (segment.IsInt)
{
return new TomlValue(segment.SplitInteger(), TomlValueType.Integer, parentIndex);
}
else
{
return new TomlValue(segment, TomlValueType.Float, parentIndex);
}
case '"':
{
int pos;
if (segment.TrySearchAscii((Byte)'"', 1, out pos))
{
return new TomlValue(segment.Subbytes(0, pos + 1), TomlValueType.BasicString, parentIndex);
}
else
{
throw new ParserException("no close string: " + segment);
}
}
case '[':
{
throw new NotImplementedException();
}
}
throw new NotImplementedException();
}
public static ListTreeNode<TomlValue> Parse(Utf8String segment)
{
var values = new List<TomlValue>()
{
new TomlValue(segment, TomlValueType.Table, -1),
};
var current = 0;
while (!segment.IsEmpty)
{
segment = segment.TrimStart();
if (segment.IsEmpty)
{
break;
}
if (segment[0] == '#')
{
// comment line
// skip to line end
segment = segment.Subbytes(segment.GetLine().ByteLength);
continue;
}
if (segment.ByteLength>=4 && segment[0]=='[' && segment[1]=='[')
{
// [[array_name]]
throw new NotImplementedException();
}
else if (segment.ByteLength>=2 && segment[0]=='[')
{
// [table_name]
int table_end;
if (!segment.TrySearchByte(x => x == ']', out table_end))
{
throw new ParserException("] not found");
}
var table_name = segment.Subbytes(1, table_end-1).Trim();
if (table_name.IsEmpty)
{
throw new ParserException("empty table name");
}
// top level key
values.Add(new TomlValue(table_name, TomlValueType.Table, 0));
current = values.Count - 1;
// skip to line end
segment = segment.Subbytes(segment.GetLine().ByteLength);
}
else
{
// key = value
{
var key = ParseLHS(segment, current);
switch(key.TomlValueType)
{
case TomlValueType.BareKey:
case TomlValueType.QuotedKey:
{
values.Add(key);
// skip key
segment = segment.Subbytes(key.Bytes.Count);
}
break;
case TomlValueType.DottedKey:
throw new NotImplementedException();
}
}
{
// search and skip =
int eq;
if (!segment.TrySearchByte(x => x == '=', out eq))
{
throw new ParserException("= not found");
}
segment = segment.Subbytes(eq + 1);
// skip white space
segment = segment.TrimStart();
}
{
var value = ParseRHS(segment, current);
values.Add(value);
// skip value
segment = segment.Subbytes(value.Bytes.Count);
// skip to line end
segment = segment.Subbytes(segment.GetLine().ByteLength);
}
}
}
return new ListTreeNode<TomlValue>(values);
}
public static ListTreeNode<TomlValue> Parse(String Toml)
{
return Parse(Utf8String.From(Toml));
}
}
}