/// <summary>
/// Relex the first word directly before the current position.
/// </summary>
/// <param name="editor"></param>
/// <param name="pos"></param>
protected void RelexPreviousWord(CodeEditor editor, int pos)
{
// get previous word and start position
var start = editor.WordStartPosition(pos, false);
var word = editor.GetWordFromPosition(start);
// find out if the previous word is a keyword
for (int i = 0; i < keywords.Length; i++)
{
// reset the style of the word if it is a keyword
if (keywords[i]?[word].Any(x => x.word == word) ?? false)
{
editor.StartStyling(start);
editor.SetStyling(pos - start, StateToStyle(i));
}
}
}
private int ProcessBraceState(CodeEditor editor, Region c, int endPos)
{
if (c[-1] == '{')
{
// get header string from block position
var typePos = FindLastStyleOf(editor, StateToStyle((int)State.Type), c.Pos);
var typeName = typePos >= 0 ? editor.GetWordFromPosition(typePos) : null;
// find lexer that can lex this code block
var lex = lexer.Where(x => x.IsLexerForType(typeName)).FirstOr(null);
// if no lexer found, skip this code block
if (lex == null)
{
// go to matching brace
int start = c.Pos;
for (int n = 0; c.Pos < endPos && n >= 0; c.Pos++)
{
if (c.c == '{') n++;
if (c.c == '}') n--;
}
// make code block invalid
editor.SetStyling(--c.Pos - start, StateToStyle((int)BaseState.Default));
return (int)(c.c == '}' ? BaseState.Braces : BaseState.Default);
}
// re-lex code block
c.Pos = lex.Style(editor, c.Pos, endPos);
}
return ProcessDefaultState(editor, c);
}
public virtual int Style(CodeEditor editor, int pos, int endPos)
{
editor.StartStyling(pos);
var textLen = editor.TextLength;
// instantiate region class
var c = new Region(editor, pos);
// continue processing from the last state
for (var state = GetPrevState(c); c.Pos < textLen; c.Pos++)
{
// process current state
var lastStyle = c.GetStyleAt(0);
state = ProcessState(editor, state, c, textLen);
var newStyle = StateToStyle(state);
//
if (c.Pos >= endPos && (c.Pos >= textLen || (newStyle > 0 && newStyle == lastStyle)))
break;
// the lexer can no longer handle the code
// go to the parent lexer and lex the code there
if (state < 0)
return parentLexer?.Style(editor, c.Pos, endPos) ?? endPos;
// style the current character
editor.SetStyling(1, newStyle);
}
return c.Pos;
}