public MojiParserResult Parse(string text)
{
var tagStack = new TagStack();
var result = new MojiParserResult();
// Crappy state machine variables
ParserState state = ParserState.ReadString;
string tagIdentifier = "";
string tagParameter = "";
string textPart = "";
int pos = 0;
// Only used for warning/error messages.
int row = 1;
int col = 0;
for (; pos < text.Length; pos++)
{
char c = text[pos];
// Increment column (character) counter, only used for warning/error messages.
// This is reset to 0 every time a `\n` character is found.
col++;
// A '<' tells us that a tag type identifier is coming.
// If the identifier is not a valid identifier the game will ignore it. It will render the closing character '>' normally.
// TODO: Can you escape a '<' in some way? E.g. like this '\<'?
if (c == '<')
{
if (textPart.Length > 0)
{
// Create MojiPart for whatever that is read up untill now.
// It's important that a new TagStack is is created.
var part = new MojiTextPart(textPart, new TagStack(tagStack));
result.Parts.Add(part);
textPart = "";
}
state = ParserState.ReadTagIdentifier;
continue;
}
if (c == '>')
{
if (state == ParserState.ReadTagIdentifier)
{
// If closing tag
if (tagIdentifier.StartsWith("/"))
{
string substr = tagIdentifier.Substring(1);
tagStack.Pop(substr);
tagIdentifier = "";
state = ParserState.ReadString;
continue;
}
else
{
result.Notices.Add(MojiParserNotice.CreateError($"Tag is closed before a parameter is given. Line: {row} Char: {col}"));
break;
}
}
if (state == ParserState.ReadTagParameter)
{
// Tag identifier and parameter closed.
try
{
var tag = CreateTag(tagIdentifier, tagParameter, row, col);
if (tag is MojiIconTag iconTag)
{
// Create a MojiIconPart and don't push the tag to the tagStack.
var iconPart = new MojiIconPart(iconTag);
result.Parts.Add(iconPart);
}
else
{
// Push STYL and SIZE tags to the tagStack.
tagStack.Push(tag);
}
}
catch (Exception ex)
{
result.Notices.Add(MojiParserNotice.CreateError(ex.Message));
break;
}
state = ParserState.ReadString;
tagIdentifier = "";
tagParameter = "";
//textPart = "";
continue;
}
}
if (c == ' ')
{
if (state == ParserState.ReadTagIdentifier)
{
state = ParserState.ReadTagParameter;
continue;
}
if (state == ParserState.ReadTagParameter)
{
result.Notices.Add(MojiParserNotice.CreateError($"Unexpected whitespace inside tag parameter. Line: {row} Char: {col}"));
break;
}
}
if (c == '\n')
{
// Only used for warning/error messages.
col = 0;
row++;
}
switch (state)
{
case ParserState.ReadString:
textPart += c;
break;
case ParserState.ReadTagIdentifier:
tagIdentifier += c;
break;
case ParserState.ReadTagParameter:
tagParameter += c;
break;
default:
break;
}
}
// Add text if textPart is not empty.
// Usually when a new tag is read all the text that is read before it will be added to the Parts lists.
// However when there are no tags in the string then this will never happen,
// to still add the read text in those cased we do this check here.
if (textPart != "")
{
var part = new MojiTextPart(textPart, new TagStack(tagStack));
result.Parts.Add(part);
}
if (pos != text.Length || result.HasErrors)
{
// Show error when pos != text.Length (aka for-loop has been cancelled early)
// Also show error when result.HasErrors (because in those cases the for-loop will also be cancelled), though this *should* be covered in the first check.
result.Notices.Add(MojiParserNotice.CreateError("Couldn't parse the full text because an error was encountered."));
}
else if (!tagStack.IsEmpty)
{
// Show warning when tagStack != empty.
// This happens when a tag is opened but not closed.
// E.g. `<SIZE 17>Hello world.`, notice the lack of the `</SIZE>` tag.
result.Notices.Add(MojiParserNotice.CreateWarning("Not all tags are closed."));
}
foreach (var unclosedTag in tagStack.Tags)
{
result.Notices.Add(MojiParserNotice.CreateWarning($"There is a <{unclosedTag.Type}> tag that does not have a matching </{unclosedTag.Type}> tag."));
}
return(result);
}
public TagStack(TagStack other)
{
tags = other.tags.ToList();
}