// Scintilla source code edit control
// @file LexAU3.cxx
// Lexer for AutoIt3 https://www.autoitscript.com/site/
// by Jos van der Zande, jvdzande@yahoo.com
//
// Changes:
// March 28, 2004 - Added the standard Folding code
// April 21, 2004 - Added Preprosessor Table + Syntax Highlighting
//                  Fixed Number highlighting
//                  Changed default isoperator to IsAOperator to have a better match to AutoIt3
//                  Fixed "#comments_start" -> "#comments-start"
//                  Fixed "#comments_end" -> "#comments-end"
//                  Fixed Sendkeys in Strings when not terminated with }
//                  Added support for Sendkey strings that have second parameter e.g. {UP 5} or {a down}
// April 26, 2004 - Fixed # pre-processor statement inside of comment block would invalidly change the color.
//                  Added logic for #include <xyz.au3> to treat the <> as string
//                  Added underscore to IsAOperator.
// May 17, 2004   - Changed the folding logic from indent to keyword folding.
//                  Added Folding logic for blocks of single-commentlines or commentblock.
//                        triggered by: fold.comment=1
//                  Added Folding logic for preprocessor blocks triggered by fold.preprocessor=1
//                  Added Special for #region - #endregion syntax highlight and folding.
// May 30, 2004   - Fixed issue with continuation lines on If statements.
// June 5, 2004   - Added comma to Operators for better readability.
//                  Added fold.compact support set with fold.compact=1
//                  Changed folding inside of #cs-#ce. Default is no keyword folding inside comment blocks when fold.comment=1
//                        it will now only happen when fold.comment=2.
// Sep 5, 2004    - Added logic to handle colourizing words on the last line.
//                        Typed Characters now show as "default" till they match any table.
// Oct 10, 2004   - Added logic to show Comments in "Special" directives.
// Nov  1, 2004   - Added better testing for Numbers supporting x and e notation.
// Nov 28, 2004   - Added logic to handle continuation lines for syntax highlighting.
// Jan 10, 2005   - Added Abbreviations Keyword used for expansion
// Mar 24, 2005   - Updated Abbreviations Keywords to fix when followed by Operator.
// Apr 18, 2005   - Updated #CE/#Comment-End logic to take a linecomment ";" into account
//                - Added folding support for With...EndWith
//                - Added support for a DOT in variable names
//                - Fixed Underscore in CommentBlock
// May 23, 2005   - Fixed the SentKey lexing in case of a missing }
// Aug 11, 2005   - Fixed possible bug with s_save length > 100.
// Aug 23, 2005   - Added Switch/endswitch support to the folding logic.
// Sep 27, 2005   - Fixed the SentKey lexing logic in case of multiple sentkeys.
// Mar 12, 2006   - Fixed issue with <> coloring as String in stead of Operator in rare occasions.
// Apr  8, 2006   - Added support for AutoIt3 Standard UDF library (SCE_AU3_UDF)
// Mar  9, 2007   - Fixed bug with + following a String getting the wrong Color.
// Jun 20, 2007   - Fixed Commentblock issue when LF's are used as EOL.
// Jul 26, 2007   - Fixed #endregion undetected bug.
//
// Copyright for Scintilla: 1998-2001 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
// Scintilla source code edit control

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>

#include <string>
#include <string_view>

#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"

#include "WordList.h"
#include "LexAccessor.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "CharacterSet.h"
#include "LexerModule.h"

using namespace Lexilla;

static inline bool IsTypeCharacter(const int ch)
{
    return ch == '$';
}
static inline bool IsAWordChar(const int ch)
{
    return (ch < 0x80) && (isalnum(ch) || ch == '_');
}

static inline bool IsAWordStart(const int ch)
{
    return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '@' || ch == '#' || ch == '$' || ch == '.');
}

static inline bool IsAOperator(char ch) {
	if (IsASCII(ch) && isalnum(ch))
		return false;
	if (ch == '+' || ch == '-' || ch == '*' || ch == '/' ||
	    ch == '&' || ch == '^' || ch == '=' || ch == '<' || ch == '>' ||
	    ch == '(' || ch == ')' || ch == '[' || ch == ']' || ch == ',' )
		return true;
	return false;
}

///////////////////////////////////////////////////////////////////////////////
// GetSendKey() filters the portion before and after a/multiple space(s)
// and return the first portion to be looked-up in the table
// also check if the second portion is valid... (up,down.on.off,toggle or a number)
///////////////////////////////////////////////////////////////////////////////

static int GetSendKey(const char *szLine, char *szKey)
{
	int		nFlag	= 0;
	int		nStartFound	= 0;
	int		nKeyPos	= 0;
	int		nSpecPos= 0;
	int		nSpecNum= 1;
	int		nPos	= 0;
	char	cTemp;
	char	szSpecial[100];

	// split the portion of the sendkey in the part before and after the spaces
	while ( ( (cTemp = szLine[nPos]) != '\0'))
	{
		// skip leading Ctrl/Shift/Alt state
		if (cTemp == '{') {
			nStartFound = 1;
		}
		//
		if (nStartFound == 1) {
			if ((cTemp == ' ') && (nFlag == 0) ) // get the stuff till first space
			{
				nFlag = 1;
				// Add } to the end of the first bit for table lookup later.
				szKey[nKeyPos++] = '}';
			}
			else if (cTemp == ' ')
			{
				// skip other spaces
			}
			else if (nFlag == 0)
			{
				// save first portion into var till space or } is hit
				szKey[nKeyPos++] = cTemp;
			}
			else if ((nFlag == 1) && (cTemp != '}'))
			{
				// Save second portion into var...
				szSpecial[nSpecPos++] = cTemp;
				// check if Second portion is all numbers for repeat fuction
				if (isdigit(cTemp) == false) {nSpecNum = 0;}
			}
		}
		nPos++;									// skip to next char

	} // End While


	// Check if the second portion is either a number or one of these keywords
	szKey[nKeyPos] = '\0';
	szSpecial[nSpecPos] = '\0';
	if (strcmp(szSpecial,"down")== 0    || strcmp(szSpecial,"up")== 0  ||
		strcmp(szSpecial,"on")== 0      || strcmp(szSpecial,"off")== 0 ||
		strcmp(szSpecial,"toggle")== 0  || nSpecNum == 1 )
	{
		nFlag = 0;
	}
	else
	{
		nFlag = 1;
	}
	return nFlag;  // 1 is bad, 0 is good

} // GetSendKey()

//
// Routine to check the last "none comment" character on a line to see if its a continuation
//
static bool IsContinuationLine(Sci_PositionU szLine, Accessor &styler)
{
	Sci_Position nsPos = styler.LineStart(szLine);
	Sci_Position nePos = styler.LineStart(szLine+1) - 2;
	//int stylech = styler.StyleAt(nsPos);
	while (nsPos < nePos)
	{
		//stylech = styler.StyleAt(nePos);
		int stylech = styler.StyleAt(nsPos);
		if (!(stylech == SCE_AU3_COMMENT)) {
			char ch = styler.SafeGetCharAt(nePos);
			if (!isspacechar(ch)) {
				if (ch == '_')
					return true;
				else
					return false;
			}
		}
		nePos--; // skip to next char
	} // End While
	return false;
} // IsContinuationLine()

//
// syntax highlighting logic
static void ColouriseAU3Doc(Sci_PositionU startPos,
							Sci_Position length, int initStyle,
							WordList *keywordlists[],
							Accessor &styler) {

    WordList &keywords = *keywordlists[0];
    WordList &keywords2 = *keywordlists[1];
    WordList &keywords3 = *keywordlists[2];
    WordList &keywords4 = *keywordlists[3];
    WordList &keywords5 = *keywordlists[4];
    WordList &keywords6 = *keywordlists[5];
    WordList &keywords7 = *keywordlists[6];
    WordList &keywords8 = *keywordlists[7];
	// find the first previous line without continuation character at the end
	Sci_Position lineCurrent = styler.GetLine(startPos);
	Sci_Position s_startPos = startPos;
	// When not inside a Block comment: find First line without _
	if (!(initStyle==SCE_AU3_COMMENTBLOCK)) {
		while ((lineCurrent > 0 && IsContinuationLine(lineCurrent,styler)) ||
			   (lineCurrent > 1 && IsContinuationLine(lineCurrent-1,styler))) {
			lineCurrent--;
			startPos = styler.LineStart(lineCurrent); // get start position
			initStyle =  0;                           // reset the start style to 0
		}
	}
	// Set the new length to include it from the start and set the start position
	length = length + s_startPos - startPos;      // correct the total length to process
    styler.StartAt(startPos);

    StyleContext sc(startPos, length, initStyle, styler);
	char si;     // string indicator "=1 '=2
	char ni;     // Numeric indicator error=9 normal=0 normal+dec=1 hex=2 Enot=3
	char ci;     // comment indicator 0=not linecomment(;)
	char s_save[100] = "";
	si=0;
	ni=0;
	ci=0;
	//$$$
    for (; sc.More(); sc.Forward()) {
		char s[100];
		sc.GetCurrentLowered(s, sizeof(s));
		// **********************************************
		// save the total current word for eof processing
		if (IsAWordChar(sc.ch) || sc.ch == '}')
		{
			strcpy(s_save,s);
			int tp = static_cast<int>(strlen(s_save));
			if (tp < 99) {
				s_save[tp] = static_cast<char>(tolower(sc.ch));
				s_save[tp+1] = '\0';
			}
		}
		// **********************************************
		//
		switch (sc.state)
        {
            case SCE_AU3_COMMENTBLOCK:
            {
				//Reset at line end
				if (sc.atLineEnd) {
					ci=0;
					if (strcmp(s, "#ce")== 0 || strcmp(s, "#comments-end")== 0) {
						if (sc.atLineEnd)
							sc.SetState(SCE_AU3_DEFAULT);
						else
							sc.SetState(SCE_AU3_COMMENTBLOCK);
					}
					break;
				}
				//skip rest of line when a ; is encountered
				if (sc.chPrev == ';') {
					ci=2;
					sc.SetState(SCE_AU3_COMMENTBLOCK);
				}
				// skip rest of the line
				if (ci==2)
					break;
				// check when first character is detected on the line
				if (ci==0) {
					if (IsAWordStart(static_cast<char>(sc.ch)) || IsAOperator(static_cast<char>(sc.ch))) {
						ci=1;
						sc.SetState(SCE_AU3_COMMENTBLOCK);
					}
					break;
				}
				if (!(IsAWordChar(sc.ch) || (sc.ch == '-' && strcmp(s, "#comments") == 0))) {
					if ((strcmp(s, "#ce")== 0 || strcmp(s, "#comments-end")== 0))
							sc.SetState(SCE_AU3_COMMENT);  // set to comment line for the rest of the line
					else
						ci=2;  // line doesn't begin with #CE so skip the rest of the line
				}
				break;
			}
            case SCE_AU3_COMMENT:
            {
                if (sc.atLineEnd) {sc.SetState(SCE_AU3_DEFAULT);}
                break;
            }
            case SCE_AU3_OPERATOR:
            {
                // check if its a COMobject
				if (sc.chPrev == '.' && IsAWordChar(sc.ch)) {
					sc.SetState(SCE_AU3_COMOBJ);
				}
				else {
					sc.SetState(SCE_AU3_DEFAULT);
				}
                break;
            }
            case SCE_AU3_SPECIAL:
            {
                if (sc.ch == ';') {sc.SetState(SCE_AU3_COMMENT);}
				if (sc.atLineEnd) {sc.SetState(SCE_AU3_DEFAULT);}
                break;
            }
            case SCE_AU3_KEYWORD:
            {
                if (!(IsAWordChar(sc.ch) || (sc.ch == '-' && (strcmp(s, "#comments") == 0 || strcmp(s, "#include") == 0))))
                {
                    if (!IsTypeCharacter(sc.ch))
                    {
						if (strcmp(s, "#cs")== 0 || strcmp(s, "#comments-start")== 0 )
						{
							sc.ChangeState(SCE_AU3_COMMENTBLOCK);
							sc.SetState(SCE_AU3_COMMENTBLOCK);
							break;
						}
						else if (keywords.InList(s)) {
							sc.ChangeState(SCE_AU3_KEYWORD);
							sc.SetState(SCE_AU3_DEFAULT);
						}
						else if (keywords2.InList(s)) {
							sc.ChangeState(SCE_AU3_FUNCTION);
							sc.SetState(SCE_AU3_DEFAULT);
						}
						else if (keywords3.InList(s)) {
							sc.ChangeState(SCE_AU3_MACRO);
							sc.SetState(SCE_AU3_DEFAULT);
						}
						else if (keywords5.InList(s)) {
							sc.ChangeState(SCE_AU3_PREPROCESSOR);
							sc.SetState(SCE_AU3_DEFAULT);
							if (strcmp(s, "#include")== 0)
							{
								si = 3;   // use to determine string start for #inlude <>
							}
						}
						else if (keywords6.InList(s)) {
							sc.ChangeState(SCE_AU3_SPECIAL);
							sc.SetState(SCE_AU3_SPECIAL);
						}
						else if ((keywords7.InList(s)) && (!IsAOperator(static_cast<char>(sc.ch)))) {
							sc.ChangeState(SCE_AU3_EXPAND);
							sc.SetState(SCE_AU3_DEFAULT);
						}
						else if (keywords8.InList(s)) {
							sc.ChangeState(SCE_AU3_UDF);
							sc.SetState(SCE_AU3_DEFAULT);
						}
						else if (strcmp(s, "_") == 0) {
							sc.ChangeState(SCE_AU3_OPERATOR);
							sc.SetState(SCE_AU3_DEFAULT);
						}
						else if (!IsAWordChar(sc.ch)) {
							sc.ChangeState(SCE_AU3_DEFAULT);
							sc.SetState(SCE_AU3_DEFAULT);
						}
					}
				}
                if (sc.atLineEnd) {
					sc.SetState(SCE_AU3_DEFAULT);}
                break;
            }
			case SCE_AU3_NUMBER:
            {
				// Numeric indicator error=9 normal=0 normal+dec=1 hex=2 E-not=3
				//
				// test for Hex notation
				if (strcmp(s, "0") == 0 && (sc.ch == 'x' || sc.ch == 'X') && ni == 0)
				{
					ni = 2;
					break;
				}
				// test for E notation
				if (IsADigit(sc.chPrev) && (sc.ch == 'e' || sc.ch == 'E') && ni <= 1)
				{
					ni = 3;
					break;
				}
				//  Allow Hex characters inside hex numeric strings
				if ((ni == 2) &&
					(sc.ch == 'a' || sc.ch == 'b' || sc.ch == 'c' || sc.ch == 'd' || sc.ch == 'e' || sc.ch == 'f' ||
					 sc.ch == 'A' || sc.ch == 'B' || sc.ch == 'C' || sc.ch == 'D' || sc.ch == 'E' || sc.ch == 'F' ))
				{
					break;
				}
				// test for 1 dec point only
				if (sc.ch == '.')
				{
					if (ni==0)
					{
						ni=1;
					}
					else
					{
						ni=9;
					}
					break;
				}
				// end of numeric string ?
				if (!(IsADigit(sc.ch)))
				{
					if (ni==9)
					{
						sc.ChangeState(SCE_AU3_DEFAULT);
					}
					sc.SetState(SCE_AU3_DEFAULT);
				}
				break;
			}
			case SCE_AU3_VARIABLE:
			{
				// Check if its a COMObject
				if (sc.ch == '.' && !IsADigit(sc.chNext)) {
					sc.SetState(SCE_AU3_OPERATOR);
				}
				else if (!IsAWordChar(sc.ch)) {
					sc.SetState(SCE_AU3_DEFAULT);
				}
				break;
            }
			case SCE_AU3_COMOBJ:
			{
				if (!(IsAWordChar(sc.ch))) {
					sc.SetState(SCE_AU3_DEFAULT);
				}
				break;
            }
            case SCE_AU3_STRING:
            {
				// check for " to end a double qouted string or
				// check for ' to end a single qouted string
	            if ((si == 1 && sc.ch == '\"') || (si == 2 && sc.ch == '\'') || (si == 3 && sc.ch == '>'))
				{
					sc.ForwardSetState(SCE_AU3_DEFAULT);
					si=0;
					break;
				}
                if (sc.atLineEnd)
				{
					si=0;
					// at line end and not found a continuation char then reset to default
					Sci_Position lineCurrent = styler.GetLine(sc.currentPos);
					if (!IsContinuationLine(lineCurrent,styler))
					{
						sc.SetState(SCE_AU3_DEFAULT);
						break;
					}
				}
				// find Sendkeys in a STRING
				if (sc.ch == '{' || sc.ch == '+' || sc.ch == '!' || sc.ch == '^' || sc.ch == '#' ) {
					sc.SetState(SCE_AU3_SENT);}
				break;
            }

            case SCE_AU3_SENT:
            {
				// Send key string ended
				if (sc.chPrev == '}' && sc.ch != '}')
				{
					// set color to SENDKEY when valid sendkey .. else set back to regular string
					char sk[100];
					// split {111 222} and return {111} and check if 222 is valid.
					// if return code = 1 then invalid 222 so must be string
					if (GetSendKey(s,sk))
					{
						sc.ChangeState(SCE_AU3_STRING);
					}
					// if single char between {?} then its ok as sendkey for a single character
					else if (strlen(sk) == 3)
					{
						sc.ChangeState(SCE_AU3_SENT);
					}
					// if sendkey {111} is in table then ok as sendkey
					else if (keywords4.InList(sk))
					{
						sc.ChangeState(SCE_AU3_SENT);
					}
					else
					{
						sc.ChangeState(SCE_AU3_STRING);
					}
					sc.SetState(SCE_AU3_STRING);
				}
				else
				{
					// check if the start is a valid SendKey start
					Sci_Position		nPos	= 0;
					int		nState	= 1;
					char	cTemp;
					while (!(nState == 2) && ((cTemp = s[nPos]) != '\0'))
					{
						if (cTemp == '{' && nState == 1)
						{
							nState = 2;
						}
						if (nState == 1 && !(cTemp == '+' || cTemp == '!' || cTemp == '^' || cTemp == '#' ))
						{
							nState = 0;
						}
						nPos++;
					}
					//Verify characters infront of { ... if not assume  regular string
					if (nState == 1 && (!(sc.ch == '{' || sc.ch == '+' || sc.ch == '!' || sc.ch == '^' || sc.ch == '#' ))) {
						sc.ChangeState(SCE_AU3_STRING);
						sc.SetState(SCE_AU3_STRING);
					}
					// If invalid character found then assume its a regular string
					if (nState == 0) {
						sc.ChangeState(SCE_AU3_STRING);
						sc.SetState(SCE_AU3_STRING);
					}
				}
				// check if next portion is again a sendkey
				if (sc.atLineEnd)
				{
					sc.ChangeState(SCE_AU3_STRING);
					sc.SetState(SCE_AU3_DEFAULT);
					si = 0;  // reset string indicator
				}
				//* check in next characters following a sentkey are again a sent key
				// Need this test incase of 2 sentkeys like {F1}{ENTER} but not detect {{}
				if (sc.state == SCE_AU3_STRING && (sc.ch == '{' || sc.ch == '+' || sc.ch == '!' || sc.ch == '^' || sc.ch == '#' )) {
					sc.SetState(SCE_AU3_SENT);}
				// check to see if the string ended...
				// Sendkey string isn't complete but the string ended....
				if ((si == 1 && sc.ch == '\"') || (si == 2 && sc.ch == '\''))
				{
					sc.ChangeState(SCE_AU3_STRING);
					sc.ForwardSetState(SCE_AU3_DEFAULT);
				}
				break;
            }
        }  //switch (sc.state)

        // Determine if a new state should be entered:

		if (sc.state == SCE_AU3_DEFAULT)
        {
            if (sc.ch == ';') {sc.SetState(SCE_AU3_COMMENT);}
            else if (sc.ch == '#') {sc.SetState(SCE_AU3_KEYWORD);}
            else if (sc.ch == '$') {sc.SetState(SCE_AU3_VARIABLE);}
            else if (sc.ch == '.' && !IsADigit(sc.chNext)) {sc.SetState(SCE_AU3_OPERATOR);}
            else if (sc.ch == '@') {sc.SetState(SCE_AU3_KEYWORD);}
            //else if (sc.ch == '_') {sc.SetState(SCE_AU3_KEYWORD);}
            else if (sc.ch == '<' && si==3) {sc.SetState(SCE_AU3_STRING);}  // string after #include
            else if (sc.ch == '\"') {
				sc.SetState(SCE_AU3_STRING);
				si = 1;	}
            else if (sc.ch == '\'') {
				sc.SetState(SCE_AU3_STRING);
				si = 2;	}
            else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext)))
			{
				sc.SetState(SCE_AU3_NUMBER);
				ni = 0;
			}
            else if (IsAWordStart(sc.ch)) {sc.SetState(SCE_AU3_KEYWORD);}
            else if (IsAOperator(static_cast<char>(sc.ch))) {sc.SetState(SCE_AU3_OPERATOR);}
			else if (sc.atLineEnd) {sc.SetState(SCE_AU3_DEFAULT);}
        }
    }      //for (; sc.More(); sc.Forward())

	//*************************************
	// Colourize the last word correctly
	//*************************************
	if (sc.state == SCE_AU3_KEYWORD)
		{
		if (strcmp(s_save, "#cs")== 0 || strcmp(s_save, "#comments-start")== 0 )
		{
			sc.ChangeState(SCE_AU3_COMMENTBLOCK);
			sc.SetState(SCE_AU3_COMMENTBLOCK);
		}
		else if (keywords.InList(s_save)) {
			sc.ChangeState(SCE_AU3_KEYWORD);
			sc.SetState(SCE_AU3_KEYWORD);
		}
		else if (keywords2.InList(s_save)) {
			sc.ChangeState(SCE_AU3_FUNCTION);
			sc.SetState(SCE_AU3_FUNCTION);
		}
		else if (keywords3.InList(s_save)) {
			sc.ChangeState(SCE_AU3_MACRO);
			sc.SetState(SCE_AU3_MACRO);
		}
		else if (keywords5.InList(s_save)) {
			sc.ChangeState(SCE_AU3_PREPROCESSOR);
			sc.SetState(SCE_AU3_PREPROCESSOR);
		}
		else if (keywords6.InList(s_save)) {
			sc.ChangeState(SCE_AU3_SPECIAL);
			sc.SetState(SCE_AU3_SPECIAL);
		}
		else if (keywords7.InList(s_save) && sc.atLineEnd) {
			sc.ChangeState(SCE_AU3_EXPAND);
			sc.SetState(SCE_AU3_EXPAND);
		}
		else if (keywords8.InList(s_save)) {
			sc.ChangeState(SCE_AU3_UDF);
			sc.SetState(SCE_AU3_UDF);
		}
		else {
			sc.ChangeState(SCE_AU3_DEFAULT);
			sc.SetState(SCE_AU3_DEFAULT);
		}
	}
	if (sc.state == SCE_AU3_SENT)
    {
		// Send key string ended
		if (sc.chPrev == '}' && sc.ch != '}')
		{
			// set color to SENDKEY when valid sendkey .. else set back to regular string
			char sk[100];
			// split {111 222} and return {111} and check if 222 is valid.
			// if return code = 1 then invalid 222 so must be string
			if (GetSendKey(s_save,sk))
			{
				sc.ChangeState(SCE_AU3_STRING);
			}
			// if single char between {?} then its ok as sendkey for a single character
			else if (strlen(sk) == 3)
			{
				sc.ChangeState(SCE_AU3_SENT);
			}
			// if sendkey {111} is in table then ok as sendkey
			else if (keywords4.InList(sk))
			{
				sc.ChangeState(SCE_AU3_SENT);
			}
			else
			{
				sc.ChangeState(SCE_AU3_STRING);
			}
			sc.SetState(SCE_AU3_STRING);
		}
		// check if next portion is again a sendkey
		if (sc.atLineEnd)
		{
			sc.ChangeState(SCE_AU3_STRING);
			sc.SetState(SCE_AU3_DEFAULT);
		}
    }
	//*************************************
	sc.Complete();
}

//
static bool IsStreamCommentStyle(int style) {
	return style == SCE_AU3_COMMENT || style == SCE_AU3_COMMENTBLOCK;
}

//
// Routine to find first none space on the current line and return its Style
// needed for comment lines not starting on pos 1
static int GetStyleFirstWord(Sci_PositionU szLine, Accessor &styler)
{
	Sci_Position nsPos = styler.LineStart(szLine);
	Sci_Position nePos = styler.LineStart(szLine+1) - 1;
	while (isspacechar(styler.SafeGetCharAt(nsPos)) && nsPos < nePos)
	{
		nsPos++; // skip to next char

	} // End While
	return styler.StyleAt(nsPos);

} // GetStyleFirstWord()


//
static void FoldAU3Doc(Sci_PositionU startPos, Sci_Position length, int, WordList *[], Accessor &styler)
{
	Sci_Position endPos = startPos + length;
	// get settings from the config files for folding comments and preprocessor lines
	bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
	bool foldInComment = styler.GetPropertyInt("fold.comment") == 2;
	bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
	bool foldpreprocessor = styler.GetPropertyInt("fold.preprocessor") != 0;
	// Backtrack to previous line in case need to fix its fold status
	Sci_Position lineCurrent = styler.GetLine(startPos);
	if (startPos > 0) {
		if (lineCurrent > 0) {
			lineCurrent--;
			startPos = styler.LineStart(lineCurrent);
		}
	}
	// vars for style of previous/current/next lines
	int style = GetStyleFirstWord(lineCurrent,styler);
	int stylePrev = 0;
	// find the first previous line without continuation character at the end
	while ((lineCurrent > 0 && IsContinuationLine(lineCurrent,styler)) ||
	       (lineCurrent > 1 && IsContinuationLine(lineCurrent-1,styler))) {
		lineCurrent--;
		startPos = styler.LineStart(lineCurrent);
	}
	if (lineCurrent > 0) {
		stylePrev = GetStyleFirstWord(lineCurrent-1,styler);
	}
	// vars for getting first word to check for keywords
	bool FirstWordStart = false;
	bool FirstWordEnd = false;
	char szKeyword[11]="";
	int	 szKeywordlen = 0;
	char szThen[5]="";
	int	 szThenlen = 0;
	bool ThenFoundLast = false;
	// var for indentlevel
	int levelCurrent = SC_FOLDLEVELBASE;
	if (lineCurrent > 0)
		levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
	int levelNext = levelCurrent;
	//
	int	visibleChars = 0;
	char chNext = styler.SafeGetCharAt(startPos);
	char chPrev = ' ';
	//
	for (Sci_Position i = startPos; i < endPos; i++) {
		char ch = chNext;
		chNext = styler.SafeGetCharAt(i + 1);
		if (IsAWordChar(ch)) {
			visibleChars++;
		}
		// get the syle for the current character neede to check in comment
		int stylech = styler.StyleAt(i);
		// get first word for the line for indent check max 9 characters
		if (FirstWordStart && (!(FirstWordEnd))) {
			if (!IsAWordChar(ch)) {
				FirstWordEnd = true;
				szKeyword[szKeywordlen] = '\0';
			}
			else {
				if (szKeywordlen < 10) {
				szKeyword[szKeywordlen++] = static_cast<char>(tolower(ch));
				}
			}
		}
		// start the capture of the first word
		if (!(FirstWordStart)) {
			if (IsAWordChar(ch) || IsAWordStart(ch) || ch == ';') {
				FirstWordStart = true;
				szKeyword[szKeywordlen++] = static_cast<char>(tolower(ch));
			}
		}
		// only process this logic when not in comment section
		if (!(stylech == SCE_AU3_COMMENT)) {
			if (ThenFoundLast) {
				if (IsAWordChar(ch)) {
					ThenFoundLast = false;
				}
			}
			// find out if the word "then" is the last on a "if" line
			if (FirstWordEnd && strcmp(szKeyword,"if") == 0) {
				if (szThenlen == 4) {
					szThen[0] = szThen[1];
					szThen[1] = szThen[2];
					szThen[2] = szThen[3];
					szThen[3] = static_cast<char>(tolower(ch));
					if (strcmp(szThen,"then") == 0 ) {
						ThenFoundLast = true;
					}
				}
				else {
					szThen[szThenlen++] = static_cast<char>(tolower(ch));
					if (szThenlen == 5) {
						szThen[4] = '\0';
					}
				}
			}
		}
		// End of Line found so process the information
		if ((ch == '\r' && chNext != '\n') || (ch == '\n') || (i == endPos)) {
			// **************************
			// Folding logic for Keywords
			// **************************
			// if a keyword is found on the current line and the line doesn't end with _ (continuation)
			//    and we are not inside a commentblock.
			if (szKeywordlen > 0 && (!(chPrev == '_')) &&
				((!(IsStreamCommentStyle(style)) || foldInComment)) ) {
				szKeyword[szKeywordlen] = '\0';
				// only fold "if" last keyword is "then"  (else its a one line if)
				if (strcmp(szKeyword,"if") == 0  && ThenFoundLast) {
						levelNext++;
				}
				// create new fold for these words
				if (strcmp(szKeyword,"do") == 0   || strcmp(szKeyword,"for") == 0 ||
					strcmp(szKeyword,"func") == 0 || strcmp(szKeyword,"while") == 0||
					strcmp(szKeyword,"with") == 0 || strcmp(szKeyword,"#region") == 0 ) {
						levelNext++;
				}
				// create double Fold for select&switch because Case will subtract one of the current level
				if (strcmp(szKeyword,"select") == 0 || strcmp(szKeyword,"switch") == 0) {
						levelNext++;
						levelNext++;
				}
				// end the fold for these words before the current line
				if (strcmp(szKeyword,"endfunc") == 0 || strcmp(szKeyword,"endif") == 0 ||
					strcmp(szKeyword,"next") == 0    || strcmp(szKeyword,"until") == 0 ||
					strcmp(szKeyword,"endwith") == 0 ||strcmp(szKeyword,"wend") == 0){
						levelNext--;
						levelCurrent--;
				}
				// end the fold for these words before the current line and Start new fold
				if (strcmp(szKeyword,"case") == 0      || strcmp(szKeyword,"else") == 0 ||
					strcmp(szKeyword,"elseif") == 0 ) {
						levelCurrent--;
				}
				// end the double fold for this word before the current line
				if (strcmp(szKeyword,"endselect") == 0 || strcmp(szKeyword,"endswitch") == 0 ) {
						levelNext--;
						levelNext--;
						levelCurrent--;
						levelCurrent--;
				}
				// end the fold for these words on the current line
				if (strcmp(szKeyword,"#endregion") == 0 ) {
						levelNext--;
				}
			}
			// Preprocessor and Comment folding
			int styleNext = GetStyleFirstWord(lineCurrent + 1,styler);
			// *************************************
			// Folding logic for preprocessor blocks
			// *************************************
			// process preprosessor line
			if (foldpreprocessor && style == SCE_AU3_PREPROCESSOR) {
				if (!(stylePrev == SCE_AU3_PREPROCESSOR) && (styleNext == SCE_AU3_PREPROCESSOR)) {
				    levelNext++;
				}
				// fold till the last line for normal comment lines
				else if (stylePrev == SCE_AU3_PREPROCESSOR && !(styleNext == SCE_AU3_PREPROCESSOR)) {
					levelNext--;
				}
			}
			// *********************************
			// Folding logic for Comment blocks
			// *********************************
			if (foldComment && IsStreamCommentStyle(style)) {
				// Start of a comment block
				if (!(stylePrev==style) && IsStreamCommentStyle(styleNext) && styleNext==style) {
				    levelNext++;
				}
				// fold till the last line for normal comment lines
				else if (IsStreamCommentStyle(stylePrev)
						&& !(styleNext == SCE_AU3_COMMENT)
						&& stylePrev == SCE_AU3_COMMENT
						&& style == SCE_AU3_COMMENT) {
					levelNext--;
				}
				// fold till the one but last line for Blockcomment lines
				else if (IsStreamCommentStyle(stylePrev)
						&& !(styleNext == SCE_AU3_COMMENTBLOCK)
						&& style == SCE_AU3_COMMENTBLOCK) {
					levelNext--;
					levelCurrent--;
				}
			}
			int levelUse = levelCurrent;
			int lev = levelUse | levelNext << 16;
			if (visibleChars == 0 && foldCompact)
				lev |= SC_FOLDLEVELWHITEFLAG;
			if (levelUse < levelNext) {
				lev |= SC_FOLDLEVELHEADERFLAG;
			}
			if (lev != styler.LevelAt(lineCurrent)) {
				styler.SetLevel(lineCurrent, lev);
			}
			// reset values for the next line
			lineCurrent++;
			stylePrev = style;
			style = styleNext;
			levelCurrent = levelNext;
			visibleChars = 0;
			// if the last character is an Underscore then don't reset since the line continues on the next line.
			if (!(chPrev == '_')) {
				szKeywordlen = 0;
				szThenlen = 0;
				FirstWordStart = false;
				FirstWordEnd = false;
				ThenFoundLast = false;
			}
		}
		// save the last processed character
		if (!isspacechar(ch)) {
			chPrev = ch;
			visibleChars++;
		}
	}
}


//

static const char * const AU3WordLists[] = {
    "#autoit keywords",
    "#autoit functions",
    "#autoit macros",
    "#autoit Sent keys",
    "#autoit Pre-processors",
    "#autoit Special",
    "#autoit Expand",
    "#autoit UDF",
    0
};
extern const LexerModule lmAU3(SCLEX_AU3, ColouriseAU3Doc, "au3", FoldAU3Doc , AU3WordLists);
