private bool ParseSegmentName()
{
char firstChar = _chars[_charPos];
ShiftBufferIfNeeded();
ReadStringIntoBuffer();
string segmentName;
if (NameTable != null)
{
segmentName = NameTable.Get(_stringReference.Chars, _stringReference.StartIndex, _stringReference.Length);
// no match in name table
if (segmentName == null)
{
segmentName = _stringReference.ToString();
}
}
else
{
segmentName = _stringReference.ToString();
}
EatWhitespace(false);
if (Grammar.SegmentNameDelimiter != _chars[_charPos])
{
throw EdiReaderException.Create(this, "Invalid character after parsing segment name. Expected '{1}' but got: {0}.".FormatWith(CultureInfo.InvariantCulture, _chars[_charPos], string.Join("', '", Grammar.DataElementSeparator)));
}
SetToken(EdiToken.SegmentName, segmentName);
ClearRecentString();
return(true);
}
internal decimal?ReadAsDecimalInternal(Picture?picture)
{
EdiToken t;
if (!ReadInternal())
{
SetToken(EdiToken.None);
return(null);
}
t = TokenType;
if (t == EdiToken.Null)
{
return(null);
}
if (t == EdiToken.String)
{
string s = (string)Value;
if (string.IsNullOrEmpty(s))
{
SetToken(EdiToken.Null);
return(null);
}
decimal d;
if (s.TryParse(picture, Culture, out d))
{
SetToken(EdiToken.Float, d, false);
return(d);
}
throw EdiReaderException.Create(this, "Could not convert string to decimal: {0}.".FormatWith(CultureInfo.InvariantCulture, Value));
}
throw EdiReaderException.Create(this, "Error reading decimal. Unexpected token: {0}.".FormatWith(CultureInfo.InvariantCulture, t));
}
internal override bool ReadInternal()
{
while (true)
{
switch (_currentState)
{
case State.Start:
return(ParseServiceStringAdvice());
case State.Segment:
case State.SegmentStart:
return(ParseSegment());
case State.Element:
case State.ElementStart:
case State.Component:
case State.ComponentStart:
return(ParseValue());
case State.SegmentName:
case State.PostValue:
// returns true if it hits
// end of object or array
if (ParsePostValue())
{
return(true);
}
break;
case State.Finished:
if (EnsureChars(0, false))
{
EatWhitespace(false);
if (_isEndOfFile)
{
return(false);
}
throw EdiReaderException.Create(this, "Additional text encountered after finished reading EDI content: {0}.".FormatWith(CultureInfo.InvariantCulture, _chars[_charPos]));
}
return(false);
default:
throw EdiReaderException.Create(this, "Unexpected state: {0}.".FormatWith(CultureInfo.InvariantCulture, CurrentState));
}
}
}
private char ParseUnicode()
{
char writeChar;
if (EnsureChars(4, true))
{
string hexValues = new string(_chars, _charPos, 4);
char hexChar = Convert.ToChar(int.Parse(hexValues, NumberStyles.HexNumber, NumberFormatInfo.InvariantInfo));
writeChar = hexChar;
_charPos += 4;
}
else
{
throw EdiReaderException.Create(this, "Unexpected end while parsing unicode character.");
}
return(writeChar);
}
internal string ReadAsStringInternal()
{
EdiToken t;
if (!ReadInternal())
{
SetToken(EdiToken.None);
return(null);
}
else
{
t = TokenType;
}
if (t == EdiToken.String)
{
return((string)Value);
}
if (t == EdiToken.Null)
{
return(null);
}
if (t.IsPrimitiveToken())
{
if (Value != null)
{
string s;
if (Value is IFormattable)
{
s = ((IFormattable)Value).ToString(null, Culture);
}
else
{
s = Value.ToString();
}
SetToken(EdiToken.String, s, false);
return(s);
}
}
throw EdiReaderException.Create(this, "Error reading string. Unexpected token: {0}.".FormatWith(CultureInfo.InvariantCulture, t));
}
private void Push(EdiContainerType value)
{
if (_currentPosition.Type == EdiContainerType.None)
{
_currentPosition = new EdiPosition(value);
}
else
{
_stack.Add(_currentPosition);
_currentPosition = new EdiPosition(value);
// this is a little hacky because Depth increases when first property/value is written but only testing here is faster/simpler
if (_maxDepth != null && Depth + 1 > _maxDepth && !_hasExceededMaxDepth)
{
_hasExceededMaxDepth = true;
throw EdiReaderException.Create(this, "The reader's MaxDepth of {0} has been exceeded.".FormatWith(CultureInfo.InvariantCulture, _maxDepth));
}
}
}
internal long?ReadAsInt64Internal()
{
EdiToken t;
if (!ReadInternal())
{
SetToken(EdiToken.None);
return(null);
}
else
{
t = TokenType;
}
if (t == EdiToken.Null)
{
return(null);
}
long i;
if (t == EdiToken.String)
{
string s = (string)Value;
if (s != null)
{
s = s.TrimStart('Z'); // Z suppresses leading zeros
}
if (string.IsNullOrEmpty(s))
{
SetToken(EdiToken.Null);
return(null);
}
if (long.TryParse(s, NumberStyles.Integer, Culture, out i))
{
SetToken(EdiToken.Integer, i, false);
return(i);
}
throw EdiReaderException.Create(this, "Could not convert string to Int64: {0}.".FormatWith(CultureInfo.InvariantCulture, Value));
}
throw EdiReaderException.Create(this, "Error reading Int64. Unexpected token: {0}.".FormatWith(CultureInfo.InvariantCulture, TokenType));
}
internal DateTime?ReadAsDateTimeInternal()
{
if (!ReadInternal())
{
SetToken(EdiToken.None);
return(null);
}
if (TokenType == EdiToken.Date)
{
return((DateTime)Value);
}
if (TokenType == EdiToken.Null)
{
return(null);
}
if (TokenType == EdiToken.String)
{
string s = (string)Value;
if (string.IsNullOrEmpty(s))
{
SetToken(EdiToken.Null);
return(null);
}
DateTime dt;
if (DateTime.TryParse(s, Culture, DateTimeStyles.RoundtripKind, out dt))
{
SetToken(EdiToken.Date, dt, false);
return(dt);
}
throw EdiReaderException.Create(this, "Could not convert string to DateTime: {0}.".FormatWith(CultureInfo.InvariantCulture, Value));
}
throw EdiReaderException.Create(this, "Error reading date. Unexpected token: {0}.".FormatWith(CultureInfo.InvariantCulture, TokenType));
}
internal int?ReadAsInt32Internal()
{
EdiToken t;
if (!ReadInternal())
{
SetToken(EdiToken.None);
return(null);
}
else
{
t = TokenType;
}
if (t == EdiToken.Null)
{
return(null);
}
int i;
if (t == EdiToken.String)
{
string s = (string)Value;
if (string.IsNullOrEmpty(s))
{
SetToken(EdiToken.Null);
return(null);
}
if (int.TryParse(s, NumberStyles.Integer, Culture, out i))
{
SetToken(EdiToken.Integer, i, false);
return(i);
}
throw EdiReaderException.Create(this, "Could not convert string to integer: {0}.".FormatWith(CultureInfo.InvariantCulture, Value));
}
throw EdiReaderException.Create(this, "Error reading integer. Unexpected token: {0}.".FormatWith(CultureInfo.InvariantCulture, TokenType));
}
private void ReadStringIntoBuffer()
{
int charPos = _charPos;
int initialPosition = _charPos;
int lastWritePosition = _charPos;
StringBuffer buffer = null;
while (true)
{
var charAt = _chars[charPos++];
if ('\0' == charAt)
{
if (_charsUsed == charPos - 1)
{
charPos--;
if (ReadData(true) == 0)
{
_charPos = charPos;
throw EdiReaderException.Create(this, "Unterminated string. Expected delimiter.");
}
}
}
// Make use of the release character. Identify escape sequence
else if (Grammar.ReleaseCharacter == charAt)
{
_charPos = charPos;
if (!EnsureChars(0, true))
{
_charPos = charPos;
throw EdiReaderException.Create(this, "Unterminated string. Expected delimiter.");
}
// start of escape sequence
int escapeStartPos = charPos - 1;
char currentChar = _chars[charPos];
char writeChar;
if (Grammar.IsSpecial(currentChar) || Grammar.ReleaseCharacter == currentChar)
{
charPos++;
writeChar = currentChar;
}
else
{
charPos++;
_charPos = charPos;
throw EdiReaderException.Create(this, "Bad EDI escape sequence: {0}{1}.".FormatWith(CultureInfo.InvariantCulture, Grammar.ReleaseCharacter, currentChar));
}
if (buffer == null)
{
buffer = GetBuffer();
}
WriteCharToBuffer(buffer, writeChar, lastWritePosition, escapeStartPos);
lastWritePosition = charPos;
}
else if (StringUtils.CarriageReturn == charAt && !Grammar.IsSpecial(charAt))
{
_charPos = charPos - 1;
ProcessCarriageReturn(true);
charPos = _charPos;
}
else if (StringUtils.LineFeed == charAt && !Grammar.IsSpecial(charAt))
{
_charPos = charPos - 1;
ProcessLineFeed();
charPos = _charPos;
}
else if (Grammar.IsSpecial(charAt))
{
if (StringUtils.LineFeed == charAt)
{
ProcessLineFeed(forwardPosition: false);
}
charPos--;
if (initialPosition == lastWritePosition)
{
_stringReference = new StringReference(_chars, initialPosition, charPos - initialPosition);
}
else
{
if (buffer == null)
{
buffer = GetBuffer();
}
if (charPos > lastWritePosition)
{
buffer.Append(_chars, lastWritePosition, charPos - lastWritePosition);
}
_stringReference = new StringReference(buffer.GetInternalBuffer(), 0, buffer.Position);
}
_charPos = charPos;
return;
}
}
}
private bool ParsePostValue()
{
while (true)
{
char currentChar = _chars[_charPos];
switch (currentChar)
{
case ' ':
case StringUtils.Tab:
// eat
_charPos++;
break;
case StringUtils.CarriageReturn:
if (Grammar.SegmentTerminator == currentChar)
{
SetToken(EdiToken.SegmentStart);
ProcessCarriageReturn(false);
return(true);
}
ProcessCarriageReturn(false);
break;
case StringUtils.LineFeed:
if (Grammar.SegmentTerminator == currentChar)
{
SetToken(EdiToken.SegmentStart);
ProcessLineFeed();
return(true);
}
ProcessLineFeed();
break;
default:
if (char.IsWhiteSpace(currentChar))
{
// eat
_charPos++;
break;
}
if (Grammar.IsSpecial(currentChar))
{
if (Grammar.ComponentDataElementSeparator == currentChar)
{
_charPos++;
// finished parsing
SetToken(EdiToken.ComponentStart);
return(true);
}
else if (Grammar.DataElementSeparator == currentChar || Grammar.SegmentNameDelimiter == currentChar)
{
_charPos++;
SetToken(EdiToken.ElementStart);
return(true);
}
else if (Grammar.SegmentTerminator == currentChar)
{
_charPos++;
SetToken(EdiToken.SegmentStart);
return(true);
}
else
{
throw EdiReaderException.Create(this, "After parsing a value an unexpected character was encountered: {0}.".FormatWith(CultureInfo.InvariantCulture, currentChar));
}
}
else
{
throw EdiReaderException.Create(this, "After parsing a value an unexpected character was encountered: {0}.".FormatWith(CultureInfo.InvariantCulture, currentChar));
}
}
}
}
