private bool DoEndTag(string ident, SymbolScanner scanner)
{
bool ret = false;
Trace.WriteLine("End Tag:" + ident);
scanner.SkipSpaces();
if (scanner.NextSymbol == SymbolScanner.SymbolCloseTag)
{
scanner.SkipSymbol();
scanner.SkipSpaces();
}
char ch = scanner.GetSymbol();
if (ch != '>')
{
_errorHandler.Error($"Expected '>' symbol but become:'{ch}'", scanner);
}
else
{
ret = true;
}
return(ret);
}
private static void CloseTag(string name, SymbolScanner scanner, Stack <XamlObjectNode> objStack)
{
XamlObjectNode objectNode = null;
List <XamlObjectNode> children = new List <XamlObjectNode>();
while (objStack.Count > 0)
{
objectNode = objStack.Peek();
if (objectNode.Name == name)
{
objectNode.LineNumberEnd = scanner.LineNumber + 1;
// it must be point to the next symbol so '-1'
objectNode.LinePositionEnd = scanner.CharPosition;
foreach (XamlObjectNode node in children)
{
objectNode.AddChild(node);
}
objectNode.SetState(XamlNodeBase.EState.Closed);
//remove found node from stack
objStack.Pop();
break;
}
children.Add(objectNode);
objectNode = objStack.Pop();
}
}
public void Error(string text, SymbolScanner scanner)
{
Trace.WriteLine(
string.Format("Parse error:{0} before line {1} position {2} symbol '{3}'",
text,
scanner.LineNumber,
scanner.CharPosition,
scanner.NextSymbol));
}
public void Error(string text, SymbolScanner scanner)
{
if (scanner == null)
{
throw new ArgumentNullException(nameof(scanner));
}
string nextSymbol = scanner.NextSymbol.ToString();
if (scanner.NextSymbol == EOF)
{
nextSymbol = "EOF";
}
throw new XamlParseException(
string.Format("Parse error:{0} at/before line {1} position {2} and before symbol '{3}'",
text,
scanner.LineNumber + 1,
scanner.CharPosition + 1,
nextSymbol));
}
public XamlMainObjectNode Parse(StreamReader fileStream)
{
if (fileStream == null)
{
throw new ArgumentNullException(nameof(fileStream));
}
Stack <XamlObjectNode> objStack = new Stack <XamlObjectNode>();
XamlObjectNode currentNode = null;
XamlMainObjectNode mainObject = null;
SymbolScanner scanner = new SymbolScanner(fileStream);
int lineNumberStart = 0;
int linePositionStart = 0;
//long newLineStreamPosition = fileStream.BaseStream.Position;
string ident;
//bool tagBracketClosed = false;
while (!fileStream.EndOfStream)
{
scanner.SkipSpaces();
char ch = scanner.GetSymbol();
if (ch == '\0')
{
break;
}
if (ch == SymbolScanner.SymbolStartTag)
{
//tagBracketClosed = false;
lineNumberStart = scanner.LineNumber;
//open tag symbol must be start not the next symbol
linePositionStart = scanner.CharPosition - 1;
char chNext = scanner.NextSymbol;
if (chNext == SymbolScanner.SymbolCloseTag)
{
scanner.SkipSymbol();
ident = scanner.GetName();
if (DoEndTag(ident, scanner))
{
CloseTag(ident, scanner, objStack);
}
}
else if (chNext == SymbolScanner.SymbolStartComment)
{
string comment = scanner.ReadComment();
Trace.WriteLine($"{lineNumberStart + 1}:{linePositionStart + 1} Comment:{comment}");
XamlCommentNode commentNode = new XamlCommentNode
{
LineNumberStart = lineNumberStart + 1,
LinePositionStart = linePositionStart + 1,
Comment = comment
};
commentNode.LineNumberEnd = scanner.LineNumber + 1;
//end position is outside comment tag
commentNode.LinePositionEnd = scanner.CharPosition;
objStack.Push(commentNode);
}
else
{
char breakSymbol;
ident = scanner.GetName();
breakSymbol = scanner.NextSymbol;
//ident = GetIdent(fileStream, out breakSymbol);
Trace.WriteLine($"{lineNumberStart + 1}:{linePositionStart + 1} Start Tag:{ident}");
if (mainObject == null)
{
mainObject = new XamlMainObjectNode {
LineNumberStart = lineNumberStart + 1, LinePositionStart = linePositionStart + 1
};
mainObject.Name = ident;
currentNode = mainObject;
//root.MainObject = mainObject;
objStack.Push(mainObject);
}
else
{
currentNode = new XamlObjectNode {
LineNumberStart = lineNumberStart + 1, LinePositionStart = linePositionStart + 1
};
currentNode.Name = ident;
objStack.Push(currentNode);
}
if (breakSymbol != SymbolScanner.SymbolEndTag)
{
scanner.SkipSpaces();
breakSymbol = scanner.NextSymbol;
}
if (breakSymbol == SymbolScanner.SymbolCloseTag)
{
//end of tag
if (DoEndTag(ident, scanner))
{
CloseTag(ident, scanner, objStack);
}
}
else if (breakSymbol != SymbolScanner.SymbolEndTag)
{
XamlObjectNode objectNode = null;
if (objStack.Count > 0)
{
objectNode = objStack.Peek();
}
bool isClosed = ReadAttributes(objectNode, scanner, breakSymbol);
if (isClosed)
{
//tagBracketClosed = true;
if (objectNode != null)
{
objectNode.SetState(XamlNodeBase.EState.EndTagPresent);
//objectNode.IsTagBracketClosed = true;
}
Trace.WriteLine("Tag end symbol for:" + ident);
}
if (scanner.NextSymbol == SymbolScanner.SymbolCloseTag)
{
//end of tag
if (DoEndTag(ident, scanner))
{
CloseTag(ident, scanner, objStack);
}
}
}
else
{
// skip '>'
scanner.SkipSymbol();
XamlObjectNode objectNode = objStack.Peek();
objectNode.SetState(XamlNodeBase.EState.EndTagPresent);
Trace.WriteLine("Tag end symbol for:" + ident);
}
//chNext = scanner.NextSymbol;
}
}
else
{
if (objStack.Count > 0)
{
XamlObjectNode objectNode = objStack.Peek();
if (objectNode.IsState(XamlNodeBase.EState.EndTagPresent))
{
lineNumberStart = scanner.LineNumber;
//text symbol must be current not the next symbol
linePositionStart = scanner.CharPosition - 1;
string text = scanner.ReadText(ch);
Trace.WriteLine("Text node:" + text);
XamlTextNode textNode = new XamlTextNode(text)
{
LineNumberStart = lineNumberStart + 1, LinePositionStart = linePositionStart + 1
};
textNode.LineNumberEnd = scanner.LastTextLineNumberEnd + 1;
// it must be the next symbol
textNode.LinePositionEnd = scanner.LastTextCharPositionEnd;
objectNode.SetState(XamlNodeBase.EState.TextNodePresent);
objectNode.AddChild(textNode);
}
else
{
//Trace.Write(ch);
_errorHandler?.Error($"Not expected symbol :'{ch}'", scanner);
}
}
else
{
//Trace.Write(ch);
_errorHandler?.Error($"Not expected symbol, no tag found :'{ch}'", scanner);
}
}
char chNext1 = scanner.CheckEndOfLine(scanner.NextSymbol);
}
if (objStack.Count > 0)
{
//ignore exception by non closed main state. Temporary
if (mainObject != null && objStack.Count == 1)
{
if (!mainObject.IsState(XamlNodeBase.EState.Closed))
{
return(mainObject);
}
}
_errorHandler?.Error($"unused {objStack.Count} nodes", scanner);
}
return(mainObject);
}
private static bool ReadAttributes(XamlObjectNode xamlObjectNode, SymbolScanner scanner, char chNext)
{
bool ret = false;
char breakSymbol;
string attributeName = string.Empty;
string attributeValue = string.Empty;
while (chNext != SymbolScanner.SymbolEndTag)
{
scanner.SkipSpaces();
XamlAttribute attribute = null;
int lineNumberValue = -1;
int linePositionValue = -1;
int lineNumberAttrName = scanner.LineNumber;
int linePositionAttrName = scanner.CharPosition;
if (scanner.NextSymbol == SymbolScanner.SymbolCloseTag || scanner.NextSymbol == SymbolScanner.SymbolEndTag)
{
if (attribute != null)
{
attribute.LineNumberEnd = scanner.LineNumber;
attribute.LinePositionEnd = scanner.CharPosition;
}
chNext = scanner.NextSymbol;
break;
}
attributeName = scanner.GetName();
scanner.SkipSpaces();
breakSymbol = scanner.NextSymbol;
if (breakSymbol == SymbolScanner.SymbolEq)
{
//skip '='
scanner.SkipSymbol();
scanner.SkipSpaces();
lineNumberValue = scanner.LineNumber;
linePositionValue = scanner.CharPosition;
attributeValue = scanner.ReadString();
chNext = scanner.CheckEndOfLine(scanner.NextSymbol);
}
else if (breakSymbol == SymbolScanner.SymbolEndTag)
{
if (attribute != null)
{
attribute.LineNumberEnd = scanner.LineNumber;
attribute.LinePositionEnd = scanner.CharPosition;
}
chNext = breakSymbol;
}
else if (breakSymbol == SymbolScanner.SymbolCloseTag)
{
chNext = scanner.GetSymbol();
chNext = scanner.NextSymbol;
}
else
{
scanner.SkipSpaces();
chNext = scanner.NextSymbol;
}
attribute = new XamlAttribute(attributeName, attributeValue)
{
LineNumberStart = lineNumberAttrName + 1,
LineNumberEnd = scanner.LineNumber + 1,
LinePositionStart = linePositionAttrName + 1,
LinePositionEnd = scanner.CharPosition,
LineNumberValueStart = lineNumberValue + 1,
LineNumberValueEnd = scanner.LineNumber + 1,
LinePositionValueStart = linePositionValue + 1,
LinePositionValueEnd = scanner.CharPosition
};
xamlObjectNode.Attributes.Add(attribute);
Trace.WriteLine(
string.Format(
"\t{0}:{1} Attribute Name:{2}, {3}:{4} Value:{5}",
lineNumberAttrName + 1,
linePositionAttrName + 1,
attributeName,
lineNumberValue + 1,
linePositionValue + 1,
attributeValue));
}
ret = chNext == SymbolScanner.SymbolEndTag;
chNext = scanner.CheckEndOfLine(scanner.NextSymbol);
if (ret)
{
chNext = scanner.GetSymbol();
//chNext = TestNextSymbol(fileStream);
chNext = scanner.CheckEndOfLine(chNext);
}
return(ret);
}
