#!/usr/bin/tclsh
# Part of MCU 8051 IDE ( http://https://sourceforge.net/projects/mcu8051ide/ )

############################################################################
#    Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012 by Martin Ošmera     #
#    martin.osmera@gmail.com                                               #
#                                                                          #
#    Copyright (C) 2014 by Moravia Microsystems, s.r.o.                    #
#    martin.osmera@gmail.com                                #
#                                                                          #
#    This program is free software; you can redistribute it and#or modify  #
#    it under the terms of the GNU General Public License as published by  #
#    the Free Software Foundation; either version 2 of the License, or     #
#    (at your option) any later version.                                   #
#                                                                          #
#    This program is distributed in the hope that it will be useful,       #
#    but WITHOUT ANY WARRANTY; without even the implied warranty of        #
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         #
#    GNU General Public License for more details.                          #
#                                                                          #
#    You should have received a copy of the GNU General Public License     #
#    along with this program; if not, write to the                         #
#    Free Software Foundation, Inc.,                                       #
#    59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             #
############################################################################

# >>> File inclusion guard
if { ! [ info exists _ASMSYNTAXHIGHLIGHT_TCL ] } {
set _ASMSYNTAXHIGHLIGHT_TCL _
# <<< File inclusion guard

# --------------------------------------------------------------------------
# DESCRIPTION
# Implements syntax highlighting interface for assembly language
# --------------------------------------------------------------------------

namespace eval ASMsyntaxHighlight {
	## Highlight colors and font styles - highlight tags definition
	 # {
	 #	{tag_name ?foreground? ?overstrike? ?italic? ?bold?}
	 # }
	variable highlight_tags	{
		{tag_char		#880066	0 0 0}
		{tag_hex		#8800BB	0 0 0}
		{tag_oct		#880000	0 0 0}
		{tag_dec		#0055AA	0 0 0}
		{tag_bin		#333355	0 0 0}
		{tag_constant		#55AA00	0 0 0}
		{tag_unknown_base	#882222 0 0 0}

		{tag_string		#888800	0 0 0}
		{tag_comment		#888888	0 1 0}
		{tag_control		#FF0000	0 0 1}
		{tag_symbol		#AA00FF	0 0 1}
		{tag_oper_sep		#DD8800 0 0 1}
		{tag_directive		#8888FF	0 0 1}
		{tag_label		#885500	0 0 0}
		{tag_instruction	#0000FF	0 0 1}
		{tag_sfr		#0000DD	0 0 0}
		{tag_indirect		#DD0000	0 0 0}

		{tag_imm_char		#DD00AA	0 0 0}
		{tag_imm_hex		#AA00DD	0 0 0}
		{tag_imm_oct		#AA0000	0 0 0}
		{tag_imm_dec		#0088DD	0 0 0}
		{tag_imm_bin		#5555AA	0 0 0}
		{tag_imm_constant	#EFBC2B	0 0 0}
		{tag_imm_unknown	#AA3333	0 0 0}

		{tag_macro		#CC00DD 0 0 1}
	}
	# Instructions keywords
	variable instructions {
		ACALL ADD ADDC AJMP ANL CJNE CLR CPL DA DEC DIV DJNZ INC JB JBC JC JMP JNB JNZ SJMP JNC CALL
		JZ LCALL LJMP MOV MOVC MOVX MUL NOP ORL POP PUSH RET RETI RL RLC RR RRC SETB SUBB SWAP XCH XCHD XRL
	}
	# SFR bits
	variable spec_bits {
		C Z P OV RS0 RS1 F0 AC CY PX0 PT0 PX1 PT1 PS RXD TXD INT0 INT1 T0 T1 WR RD
		EX0 ET0 EX1 ET1	ES EA RI TI RB8 TB8 REN SM2 SM1 SM0 IT0 IE0 IT1 IE1 TR0 TF0 TR1 TF1
		TF2 EXF2 RCLK TCLK EXEN2 TR2 CT2 CPRL2 EC PC ET2 PT2 FE
		CR CCF4 CCF3 CCF2 CCF1 CCF0 PPCL PT2L PSL PT1L PX1L PT0L PX0L
	}
	# SFR registers and bits
	variable spec_registers	[concat {
		A ACC B AB P0 P1 P2 P3 TL0 TL1 TH0 TH1 TMOD TCON SCON DPL PCON PSW SP DPH SBUF IE IP
		R0 R1 R2 R3 R4 R5 R6 R7 DPTR DP0L DP0H
		T2CON T2MOD RCAP2L RCAP2H TL2 TH2 AUXR1 WDTRST AUXR P4 DPH DPL DP1H DP1L
		WDTCON EECON CLKREG ACSR IPH SADDR SADEN SPCR SPSR SPDR CKCON WDTPRG

		CH CCAP0H CCAP1H CCAPL2H CCAPL3H CCAPL4H ADCLK ADCON ADDL ADDH ADCF
		CL CCAP0L CCAP1L CCAPL2L CCAPL3L CCAPL4L P1M2 P3M2 P4M2
		P1M1 P3M1 P4M1 SPCON SPSTA SPDAT CMOD CCAPM0 CCAPM1 CCAPM2 CCAPM3 CCAPM4
		IPL1 IPH1 IPH0 BRL BDRCON KBLS KBE KBF WDTRST WDTPRG CKRL CKCON0 IPL0  CCON
	} $spec_bits]

	## COMPILER DIRECTIVES
	# directives without arguments
	variable directive_type0 {
		ENDIF ENDM END ELSE EXITM LIST NOLIST
	}

	# directives with argument(s) but without any label
	variable directive_type1 {
		DSEG ISEG BSEG XSEG CSEG SKIP NAME LOCAL
	}
	# directives for symbol definitions
	variable directive_type2 {
		EQU BIT SET CODE DATA IDATA XDATA MACRO FLAG
	}
	# directives with argument and optional label
	variable directive_type3 {
		DS DW DB DBIT INCLUDE ORG IF USING BYTE NAME REPT TIMES
		ELSEIF IFN ELSEIFN IFDEF ELSEIFDEF IFNDEF ELSEIFNDEF IFB ELSEIFB IFNB ELSEIFNB
	}
	# all known directives
	variable all_directives [concat $directive_type0 $directive_type1 $directive_type2 $directive_type3]
	# word operators
	variable expr_instructions {
		MOD SHR SHL NOT AND OR LE XOR EQ NE GT GE LT HIGH LOW
	}
	# symbol operators
	variable expr_symbols {
		= + - * /  > < %
	}

	# control sequencies without any argument
	variable controls_type0 {
		NOLIST NOMOD NOOBJECT NOPAGING NOPRINT
		NOSYMBOLS EJECT LIST PAGING SYMBOLS NOMACROSFIRST

		NOXR NOXREF XR XREF NOSB SB RESTORE RS SA SAVE PHILIPS
		NOPI PI NOTABS NOMOD51 NOBUILTIN NOMO MO MOD51 NOMACRO
		NOMR LI NOLI GENONLY GO NOGEN NOGE GEN GE  EJ NODB
		NODEBUG DB DEBUG CONDONLY NOCOND COND
	}
	# control sequencies with exactly 1 argument
	variable controls_type1 {
		PAGEWIDTH PAGELENGTH PRINT TITLE OBJECT DATE INCLUDE

		TT PW PL MR MACRO INC WARNING ERROR DA
	}
	# all known control sequencies
	variable all_controls  [concat $controls_type0 $controls_type1]
	# all known control sequencies with preceeding dolar character
	variable all_controls__with_dolar
	# all known directives and control sequencies
	variable all_directives_and_controls [concat $all_directives $all_controls]
	# list of all reserved keywords
	variable keyword_lists [list	\
		$instructions		\
		$directive_type0	\
		$directive_type1	\
		$directive_type2	\
		$directive_type3	\
	]

	variable inline_asm		;# Is inline assembler
	variable editor			;# ID of the text widget
	variable lineNumber		;# Number of current line
	variable lineStart		;# Index of line start
	variable lineEnd		;# Index of line end
	variable data			;# Content of the line
	variable data_backup		;# Original content of the line
	variable last_index		;# Last parse index
	variable last_index_backup	;# Auxiliary variable (some index)

	variable seg_0			;# 1st field of the line
	variable seg_1			;# 2nd field of the line
	variable seg_2			;# 3rd field of the line
	variable seg_0_start		;# Start index of seg_0
	variable seg_1_start		;# Start index of seg_1
	variable seg_2_start		;# Start index of seg_2
	variable seg_0_end		;# End index of seg_0
	variable seg_1_end		;# End index of seg_1
	variable seg_2_end		;# End index of seg_2

	variable operands_count	0	;# Number of operands at the line
	variable operand		;# Data of the current operand
	variable opr_end		;# End index of the current operand
	variable opr_start		;# Start index of the current operand

	## List of operand types on the line (eg. '{D # DPTR}')
	 # Possible values are:
	 #	- '#'  :  Immediate addressing
	 #	- @$x  :  Indirect addressing (one of {@R0 @R1 @DPTR @A+DPTR @A+PC})
	 #	- '/'  :  Inverted bit
	 #	- 'D'  :  Direct addressing
	 #	- $sfr :  One of {R0 R1 R2 R3 R4 R5 R6 R7 DPTR A AB C}
	variable opr_types

	variable validation_L0	1	;# Bool: Basic validation enabled
	variable validation_L1	1	;# Bool: Advancet validation enabled

	## Define highlighting text tags in the given text widget
	 # @parm Widget text_widget	- ID of the target text widget
	 # @parm Int fontSize		- font size
	 # @parm String fontFamily	- font family
	 # @parm List highlight=default	- Highlighting tags definition
	 # @parm Bool nobold=0		- Ignore bold flag
	 # @return void
	proc create_tags {text_widget fontSize fontFamily {highlight {}} {nobold 0}} {
		variable highlight_tags	;# Highlight tags definition

		# Handle arguments
		if {$highlight == {}} {		;# highlighting definition
			set highlight $highlight_tags
		}

		# Iterate over highlighting tags definition
		foreach item $highlight {
			# Create array of tag attributes
			for {set i 0} {$i < 5} {incr i} {
				set tag($i) [lindex $item $i]
			}

			# Foreground color
			if {$tag(1) == {}} {
				set tag(1) black
			}
			# Fonr slant
			if {$tag(3) == 1} {
				set tag(3) italic
			} else {
				set tag(3) roman
			}
			# Font weight
			if {$tag(4) == 1 && !$nobold} {
				set tag(4) bold
			} else {
				set tag(4) normal
			}

			# Tag "tag_constant" is copied as "tag_constant_def"
			#+ and "tag_macro" as "tag_macro_def"
			if {$tag(0) == {tag_constant}} {
				lappend tag(0) {tag_constant_def}
			} elseif {$tag(0) == {tag_macro}} {
				lappend tag(0) {tag_macro_def}
			}

			# Create the tag in the target text widget
			foreach tag_name $tag(0) {
				$text_widget tag configure $tag_name	\
					-foreground $tag(1)		\
					-font [font create		\
						-overstrike $tag(2)	\
						-slant $tag(3)		\
						-weight $tag(4)		\
						-size -$fontSize	\
						-family $fontFamily 	\
					]
			}
		}
		# Add tag error
		$text_widget tag configure tag_error -underline 1
	}

	## Perform syntax highlight on the given line in the given widget
	 # @parm Widget p_editor	- Text widget
	 # @parm Int linenumber		- Number of line to highlight
	 # @parm Bool inlineasm		- Inline assembler
	 # @parm Int linestart=0	- Start index
	 # @parm Int lineend=end	- End index
	 # @return Bool - result
	proc highlight {p_editor linenumber {inlineasm 0} {linestart {}} {lineend {}}} {
		variable editor		;# ID of the text widget
		variable lineNumber	;# Number of current line
		variable lineStart	;# Index of line start
		variable lineEnd	;# Index of line end
		variable inline_asm	;# Is inline assembler

		variable seg_0	{}	;# 1st field of the line
		variable seg_1	{}	;# 2nd field of the line
		variable seg_2	{}	;# 3rd field of the line
		variable seg_0_start	;# Start index of seg_0
		variable seg_1_start	;# Start index of seg_1
		variable seg_2_start	;# Start index of seg_2
		variable seg_0_end	;# End index of seg_0
		variable seg_1_end	;# End index of seg_1
		variable seg_2_end	;# End index of seg_2

		variable last_index	;# Last parse index
		variable data		;# Content of the line
		variable operands_count	;# Number of operand in the line
		variable validation_L0	;# Bool: Basic validation enabled

		# Parse input arguments
		set editor $p_editor
		set lineNumber $linenumber
		set inline_asm $inlineasm
		if {$linestart == {}} {
			set lineStart $lineNumber.0
		} else {
			set lineStart $lineNumber.$linestart
		}
		if {$lineend == {}} {
			set lineEnd [$editor index [list $lineStart lineend]]
		} else {
			set lineEnd $lineNumber.$lineEnd
		}
		if {$linestart != {}} {
			set start_offset $linestart
		} else {
			set start_offset 0
		}

		set data [$editor get $lineStart $lineEnd]
		set operands_count 0
		set opr_types {}

		if {$inline_asm} {
			delete_tags
		}

		# check if the line is not empty
		if {[regexp {^\s*$} $data]} {
			return 0
		}
		set line_length [string length $data]
		if {$line_length == 0} {
			return 0
		}

		# determinate comment field and highlight it (the last field)
		set comment_start {}
		if {[regexp {;} $data]} {

			# remove 'string' from the line
			set comment_data [hide_strings $data]

			if {[regexp {;.*$} $comment_data comment_start]} {

				set comment_start [string length $comment_start]
				set comment_start [expr {$line_length - $comment_start}]

				# remove comment and trailing space from the line
				if {$comment_start == 0} {
					set data {}
					delete_tags
				} else {
					set data [string range $data 0 [expr {$comment_start - 1}]]
					regsub {\s+$} $data {} data
				}

				incr comment_start $start_offset
			}
		}

		# Handle line containing only comment
		if {![string length $data]} {
			if {!$inline_asm} {
				delete_tags
			}
			$editor tag add tag_comment $lineNumber.$comment_start $lineEnd
			return 1
		}

		# Determinate 1st segment of the line
		regexp {^\s*[^\s]+:?} $data seg_0
		if {[regexp {\w\(} $seg_0]} {
			regsub {\(.*$} $seg_0 {} seg_0
		}
		if {[string last {:} $seg_0] != -1} {
			set seg_0 [string range $seg_0 0 [string last {:} $seg_0]]
		}
		set seg_0_end [string length $seg_0]
		regsub {^\s+} $seg_0 {} seg_0

		set seg_0_start [string length $seg_0]
		set seg_0_start [expr {$seg_0_end - $seg_0_start}]

		set data [string replace $data 0 [expr {$seg_0_end - 1}]]
		incr seg_0_end $start_offset
		incr seg_0_start $start_offset
		set last_index $seg_0_end

		#
		# SYNTAX HIGHLIGHT
		#

		# delete existing tags within the line
		if {!$inline_asm} {
			delete_tags
		}

		# highlight comment
		if {$comment_start != {}} {
			$editor tag add tag_comment $lineNumber.$comment_start $lineEnd
		}
		# highlight 1st and 2nd field
		set seg_0_info [parse_segment $seg_0_start $seg_0_end $seg_0]

		# Conditional parsing with validation
		switch -- [lindex $seg_0_info 0] {
			{control_0} {}
			{control_1} {}
			{control_incorrect} {}
			{label}	{
				determinate_segment_1
				set seg_1_info [parse_segment $seg_1_start $seg_1_end $seg_1]
				switch -- [lindex $seg_1_info 0] {
					{control_0} {
						determinate_segment_2
						put_error_on_segment 2
					}
					{control_1} {
						determinate_segment_2
						put_error_on_segment 2
					}
					{label}	{
						put_error_on_segment 1
					}
					{instruction} {
						determinate_segment_2
						parse_operands
					}
					{directive_3} {
						determinate_segment_2
						if {![string length $seg_2]} {
							put_error_on_segment 1
						}

						set seg_1 [string tolower $seg_1]
						if {$seg_1 == {db} || $seg_1 == {.db} || $seg_1 == {byte} || $seg_1 == {.byte}} {
							parse_operands
						} elseif {$seg_1 == {include} || $seg_1 == {.include}} {
							$editor tag add tag_string		\
								$lineNumber.$seg_2_start	\
								[list $lineNumber.0 lineend]
						} else {
							parse_expressions
						}
					}
					{directive_2} {
						put_error_on_segment 0
					}
					{directive_1} {}
					{directive_0} {
						determinate_segment_2
						if {[string length $seg_2]} {
							incr seg_2_end
							put_error_on_segment 2
						}
					}
					{unknown} {
						$editor tag add tag_macro	\
							$lineNumber.$seg_1_start $lineNumber.$seg_1_end
						if {
							$validation_L0 &&
							([regexp {^\d} $seg_1] || ![regexp {^\w+$} $seg_1])
						} then {
							put_error_on_segment 1
						}
						determinate_segment_2
						parse_operands
					}
					default {
						put_error_on_segment 1
					}
				}
			}
			{instruction} {
				determinate_segment_2
				parse_operands
			}
			{directive_3} {
				determinate_segment_2
				if {![string length $seg_2]} {
					put_error_on_segment 0
				}

				set seg_0 [string tolower $seg_0]
				if {$seg_0 == {db} || $seg_0 == {.db} || $seg_0 == {byte} || $seg_0 == {.byte}} {
					parse_operands
				} elseif {$seg_0 == {include} || $seg_0 == {.include}} {
					$editor tag add tag_string		\
						$lineNumber.$seg_2_start	\
						[list $lineNumber.0 lineend]
				} else {
					parse_expressions
				}
			}
			{directive_2} {
				determinate_segment_2
				parse_expressions
				put_error_on_segment 0
			}
			{directive_1} {
				determinate_segment_2
				parse_expressions
			}
			{directive_0} {
				determinate_segment_1
				put_error_on_segment 1
				determinate_segment_2
				put_error_on_segment 2
			}
			{unknown} {
				determinate_segment_1
				set seg_1_info [parse_segment $seg_1_start $seg_1_end $seg_1]

				switch -- [lindex $seg_1_info 0] {
					{control_0} {
						determinate_segment_2
						put_error_on_segment 2
					}
					{control_1} {
						determinate_segment_2
						put_error_on_segment 2
					}
					{label}	{
						put_error_on_segment 0
					}
					{instruction} {
						put_error_on_segment 0
						determinate_segment_2
						parse_operands
					}
					{directive_3} {
						put_error_on_segment 0
						determinate_segment_2
						set seg_1 [string tolower $seg_1]
						if {$seg_1 == {db} || $seg_1 == {.db} || $seg_1 == {byte} || $seg_1 == {.byte}} {
							parse_operands
						} elseif {$seg_1 == {include} || $seg_1 == {.include}} {
							$editor tag add tag_string		\
								$lineNumber.$seg_2_start	\
								[list $lineNumber.0 lineend]
						} else {
							parse_expressions
						}
					}
					{directive_2} {
						if {
							$validation_L0 &&
							([regexp {^\d} $seg_0] || ![regexp {^\w+$} $seg_0])
						} then {
							put_error_on_segment 0
						}

						set sg [string tolower $seg_1]
						if {$sg == {macro} || $sg == {.macro}} {
							$editor tag add tag_macro_def		\
								$lineNumber.$seg_0_start	\
								$lineNumber.$seg_0_end
							determinate_segment_2
							parse_arguments
						} else {
							$editor tag add tag_constant_def	\
								$lineNumber.$seg_0_start	\
								$lineNumber.$seg_0_end

							determinate_segment_2
							parse_expressions
						}
					}
					{directive_1} {
						put_error_on_segment 0
						determinate_segment_2
						parse_expressions
					}
					{directive_0} {
						put_error_on_segment 0
						determinate_segment_2
						put_error_on_segment 2
					}
					{unknown} {
						$editor tag add tag_macro $lineNumber.$seg_0_start $lineNumber.$seg_0_end

						if {
							$validation_L0 &&
							([regexp {^\d} $seg_0] || ![regexp {^\w+$} $seg_0])
						} then {
							put_error_on_segment 0
						}
						determinate_segment_1_take_back
						determinate_segment_2
						parse_operands
					}
					default {
						$editor tag add tag_macro $lineNumber.$seg_0_start $lineNumber.$seg_0_end
						if {
							$validation_L0 &&
							([regexp {^\d} $seg_0] || ![regexp {^\w+$} $seg_0])
						} then {
							put_error_on_segment 0
						}
					}
				}
			}
			default {}
		}

		return 1
	}

	## Remove previously defined syntax highlighting tags
	 # @return void
	proc delete_tags {} {
		variable editor			;# ID of the text widget
		variable highlight_tags	;# Highlight tags definition
		variable lineStart		;# Index of line start
		variable lineEnd		;# Index of line end

		set lineStart_truestart [$editor index [list $lineStart linestart]]

		# Remove tag error, tag_constant_def and tag_macro_def
		foreach tag {tag_error tag_constant_def tag_macro_def} {
			$editor tag remove $tag $lineStart_truestart $lineStart_truestart+1l
		}

		# Remove tags according to pattern
		foreach tag $highlight_tags {
			$editor tag remove [lindex $tag 0] $lineStart_truestart $lineEnd
		}
	}

	## Take back extraction of segment 1
	 # @return void
	proc determinate_segment_1_take_back {} {
		variable data			;# Content of the line
		variable data_backup		;# Original content of the line
		variable last_index		;# Last parse index
		variable last_index_backup	;# Auxiliary variable (some index)

		set data $data_backup
		set last_index $last_index_backup
	}

	## Extract segment 1 from the line
	 # @return void
	proc determinate_segment_1 {} {
		variable seg_1			;# 2nd field of the line
		variable seg_1_start		;# Start index of seg_1
		variable seg_1_end		;# End index of seg_1
		variable last_index		;# Last parse index
		variable data			;# Content of the line
		variable data_backup		;# Original content of the line
		variable last_index_backup	;# Auxiliary variable (some index)

		# Line is empty
		# if {![regexp {^\s*[^\s\(]+} $data seg_1]}
		if {![regexp {^\s*[^\s]+} $data seg_1]} {
			set seg_1 {}
			set seg_1_end $last_index
			set seg_1_start $last_index

		# Line is not empty
		} else {
			set data_backup $data
			set last_index_backup $last_index

			set seg_1_end [string length $seg_1]
			set data [string replace $data 0 [expr {$seg_1_end - 1}]]
			incr seg_1_end $last_index

			regsub {^\s+} $seg_1 {} seg_1
			set seg_1_start [string length $seg_1]
			set seg_1_start [expr {$seg_1_end - $seg_1_start}]

			set last_index $seg_1_end
		}
	}

	## Extract segment 2 from the line
	 # @return void
	proc determinate_segment_2 {} {
		variable seg_2		;# 3rd field of the line
		variable seg_2_start	;# Start index of seg_2
		variable seg_2_end	;# End index of seg_2
		variable last_index	;# Last parse index
		variable data		;# Content of the line

		# determinate the last segment of the line
		set seg_2_start $last_index
		if {[regexp {^\s+} $data space]} {
			incr seg_2_start [string length $space]
		}
		regsub {^\s+} $data {} seg_2
		regsub {\s+$} $seg_2 {} seg_2
		set seg_2_end [string length $seg_2]
		incr seg_2_end $last_index
		set data {}
	}

	## Shorthand for 'parse_expression $seg_2 $seg_2_start $seg_2_end'
	 # @return void
	proc parse_expressions {} {
		variable seg_2		;# 3rd field of the line
		variable seg_2_start	;# Start index of seg_2
		variable seg_2_end	;# End index of seg_2

		parse_expression $seg_2 $seg_2_start $seg_2_end
	}

	## Parse given segment, highlight it and determinate its type
	 # @parm Int start		- start column
	 # @parm int end		- end column
	 # @parm String segment_data	- content of segment to parse
	 # @return List - {segment_type expression_length} or {segment_type {}} or {{} {}}
	proc parse_segment {start end segment_data} {
		variable controls_type0	;# control sequencies without any argument
		variable controls_type1	;# control sequencies with exactly 1 argument

		variable keyword_lists	;# list of all reserved keywords
		variable editor		;# ID of the text widget
		variable lineNumber	;# Number of current line
		variable lineStart	;# Index of line start
		variable lineEnd	;# Index of line end
		variable data		;# Content of the line
		variable validation_L0	;# Bool: Basic validation enabled
		variable inline_asm	;# Bool: Is inline assembler

		# Local variables
		set seg_type {}		;# segment type
		set expr_len 0		;# length of expression

		# Handle empty segments
		if {$segment_data == {}} {
			return [list $seg_type $expr_len]
		}

		# Convert segment data to uppre case (patterns are uppper-case)
		set segment_data [string toupper $segment_data]

		# Try to determinate segment type and perform highlight
		set keyword $segment_data
		if {[string index $keyword 0] == {.}} {
			set keyword [string replace $keyword 0 0]
		}
		foreach	keyword_list	$keyword_lists \
			tag		{tag_instruction tag_directive tag_directive tag_directive tag_directive} \
			type		{instruction directive_0 directive_1 directive_2 directive_3} {
			if {$type != {instruction}} {
				if {[lsearch -ascii -exact $keyword_list $keyword] != -1} {
					$editor tag add $tag $lineNumber.$start $lineNumber.$end
					set seg_type $type
					break
				}
			} else {
				if {[lsearch -ascii -exact $keyword_list $segment_data] != -1} {
					$editor tag add $tag $lineNumber.$start $lineNumber.$end
					set seg_type $type
					break
				}
			}
		}

		# If segment type could not be recognized -> check for labels, macro's and controls
		if {$seg_type == {}} {
			# Handle compiler control sequences
			if {[string index $segment_data 0] == {$}} {
				set segment_data [string range $segment_data 1 end]
				set expr_data {}

				set segment_data "$segment_data $data"
				set segment_data [string trimright $segment_data {  }]
				set end [string length $segment_data]
				incr end [expr {$start + 1}]
				set ctrl_end $end
				set data {}
				if {[regexp {\(.*$} $segment_data expr_data]} {
					set expr_len [string length $expr_data]
					set expr_start [expr {$end - $expr_len - 1}]
					set expr_end [expr {$expr_start + $expr_len}]
					set end $expr_start
					regsub {\(.*$} $segment_data {} segment_data
					set segment_data [string trimright $segment_data]
				}

				# Control type 1
				if {[lsearch -ascii -exact $controls_type1 $segment_data] != -1} {
					set seg_type control_1
				# Control type 0
				} elseif {[lsearch -ascii -exact $controls_type0 $segment_data] != -1} {
					set seg_type control_0
				# Incorrect control sequence
				} else {
					set seg_type control_incorrect
					if {$validation_L0} {
						$editor tag add tag_error $lineNumber.$start $lineNumber.$end
					}
				}

				# Puts tag "control"
				$editor tag add tag_control $lineNumber.$start $lineNumber.$end

				# Control sequence argument
				if {$expr_data != {}} {
					parse_argument $expr_start $expr_end $expr_data $start $end
					if {$validation_L0 && $seg_type == {control_0}} {
						$editor tag add tag_error $lineNumber.$expr_start $lineNumber.$expr_end
					}
				} elseif {$validation_L0 && $seg_type == {control_1}} {
					$editor tag add tag_error $lineNumber.$start $lineNumber.$end
				}

			# Labels
			} elseif {[regexp -nocase {^[^\s]*:$} $segment_data]} {
				$editor tag add tag_label $lineNumber.$start $lineNumber.$end
				set seg_type label

				if {$inline_asm} {
					if {![regexp -nocase {^\w+\$:$} $segment_data]} {
						$editor tag add tag_error $lineNumber.$start $lineNumber.$end
					}
				} else {
					if {![regexp -nocase {^[a-zA-Z]\w*:$} $segment_data]} {
						$editor tag add tag_error $lineNumber.$start $lineNumber.$end
					}
				}

			# Unknown type - possibly macro instruction
			} else {
				set seg_type unknown
			}
		}

		# Return result
		return [list $seg_type $expr_len]
	}

	## Highlight argument (eg. '("some string")')
	 # @parm Int start_index	- start column of the argument
	 # @parm Int end_index		- end column of the argument
	 # @parm String data		- argument data
	 # @return void
	proc parse_argument {start_index end_index data control_start control_end} {
		variable editor		;# ID of the text widget
		variable lineNumber	;# Number of current line
		variable validation_L0	;# Bool: Basic validation enabled

		if {[regexp {^\(.*\)$} $data]} {
			$editor tag add tag_symbol $lineNumber.$start_index $lineNumber.[expr {$start_index + 1}]
			set end [expr {$end_index - 1}]
			$editor tag add tag_symbol $lineNumber.$end $lineNumber.$end_index

			$editor tag add tag_string $lineNumber.[expr {$start_index + 1}] $lineNumber.$end
		} else {
			if {$validation_L0} {
				$editor tag add tag_error	\
					$lineNumber.$control_start $lineNumber.$control_end
			}
		}
	}

	## Tag the given segment as error
	 # @parm Int segment_number - number of the target segment
	 # @return void
	proc put_error_on_segment {segment_number} {
		variable editor		;# ID of the text widget
		variable lineNumber	;# Number of current line
		variable validation_L0	;# Bool: Basic validation enabled
		variable seg_0_start	;# Start index of seg_0
		variable seg_1_start	;# Start index of seg_1
		variable seg_2_start	;# Start index of seg_2
		variable seg_0_end	;# End index of seg_0
		variable seg_1_end	;# End index of seg_1
		variable seg_2_end	;# End index of seg_2

		if {!$validation_L0} {
			return
		}

		# Determinate start and end index
		switch -- $segment_number {
			0 {
				set start $seg_0_start
				set end $seg_0_end
			}
			1 {
				set start $seg_1_start
				set end $seg_1_end
			}
			2 {
				set start $seg_2_start
				set end $seg_2_end
			}
		}

		# Add error tag
		$editor tag add tag_error $lineNumber.$start $lineNumber.$end
	}

	## Parse attributes in defintion of macro instruction
	 # @retunr void
	proc parse_arguments {} {
		variable editor			;# ID of the text widget
		variable lineNumber		;# Number of current line
		variable seg_2_start		;# Start index of seg_2
		variable seg_2			;# 3rd field of the line
		variable validation_L0		;# Bool: Basic validation enabled

		if {[regexp {^\s*$} $seg_2]} {return 0}

		while {1} {
			# Handle redutant commas
			while {1} {
				if {![regexp {^\s*\,} $seg_2]} {break}

				set space_len 0
				if {[regexp {^\s+} $seg_2 space_len]} {
					set space_len [string length $space_len]
				}

				incr seg_2_start $space_len
				set seg_2		[string range $seg_2 [expr {$space_len + 1}] end]

				$editor tag add tag_oper_sep		\
					$lineNumber.$seg_2_start	\
					$lineNumber.[expr {$seg_2_start + 1}]

				if {$validation_L0} {
					$editor tag add tag_error		\
						$lineNumber.$seg_2_start	\
						$lineNumber.[expr {$seg_2_start + 1}]
				}

				incr seg_2_start
			}

			# Determinate argument
			if {![regexp {^[^\,]+} $seg_2 argument]} {break}
			set argument_len_org	[string length $argument]
			set seg_2		[string range $seg_2 $argument_len_org end]
			set argument		[string trimleft $argument]
			set argument_len	[string length $argument]
			incr seg_2_start	[expr {$argument_len_org - $argument_len}]

			# Highlight argument
			$editor tag add tag_constant		\
				$lineNumber.$seg_2_start	\
				$lineNumber.[expr {$seg_2_start + $argument_len}]
			set argument [string trimright $argument]
			if {$validation_L0 && ([regexp {^\d} $argument] || ![regexp {^\w+$} $argument])} {
				$editor tag add tag_error		\
					$lineNumber.$seg_2_start	\
					$lineNumber.[expr {$seg_2_start + $argument_len}]
			}

			incr seg_2_start $argument_len

			# highlight argument separator
			if {[string index $seg_2 0] == {,}} {
				set sep_end $seg_2_start
				incr sep_end
				$editor tag add tag_oper_sep $lineNumber.$seg_2_start $lineNumber.$sep_end
				if {$validation_L0 && ![regexp {[\w$]} $seg_2]} {
					$editor tag add tag_error $lineNumber.$seg_2_start $lineNumber.$sep_end
				}
				incr seg_2_start
				set seg_2 [string range $seg_2 1 end]
			}
		}
	}

	## Highlight all operands (segment 2) and their separators
	 # @return void
	proc parse_operands {} {
		variable editor			;# ID of the text widget
		variable lineNumber		;# Number of current line
		variable seg_2_start		;# Start index of seg_2
		variable seg_2			;# 3rd field of the line

		variable operands_count		;# Number of operands at the line
		variable operand		;# Data of the current operand
		variable opr_end		;# End index of the current operand
		variable opr_start		;# Start index of the current operand

		variable opr_types		;# List of operand types
		variable validation_L0		;# Bool: Basic validation enabled
		variable validation_L1		;# Bool: Advancet validation enabled

		if {[regexp {^\s*$} $seg_2]} {return 0}
		set operands_count 0
		set opr_types {}

		# split data into single operands
		set i 0
		set last_index $seg_2_start
		set original_data $seg_2
		set data [hide_strings $seg_2]

		while {1} {
			# Handle redutant commas
			while {1} {
				if {![regexp {^\s*\,} $data]} {break}

				set space_len 0
				if {[regexp {^\s+} $data space_len]} {
					set space_len [string length $space_len]
				}
				incr last_index $space_len

				set data		[string range $data [expr {$space_len + 1}] end]
				set original_data	[string range $original_data [expr {$space_len + 1}] end]

				$editor tag add tag_oper_sep	\
					$lineNumber.$last_index	\
					$lineNumber.[expr {$last_index + 1}]

				if {$validation_L0} {
					$editor tag add tag_error	\
						$lineNumber.$last_index	\
						$lineNumber.[expr {$last_index + 1}]
				}

				incr last_index
			}

			# gain operand data
			if {![regexp {^[^\,]+} $data operand]} {break}
			set operand_len		[string length $operand]
			set data		[string range $data $operand_len end]
			set operand		[string range $original_data 0 [expr {$operand_len - 1}]]
			set original_data	[string range $original_data $operand_len end]

			# determinate start index
			if {[regexp {^\s+} $operand space]} {
				set space_len	[string length $space]
				set opr_start	[expr {$last_index + $space_len}]
				set operand	[string range $operand $space_len end]
			} else {
				set opr_start $last_index
			}

			# determinate end index
			if {[regexp {\s+$} $operand space]} {
				set space_len	[string length $space]
				set opr_end	[expr {$operand_len - $space_len}]
				set operand	[string range $operand 0 $opr_end]
			} else {
				set opr_end $operand_len
			}
			incr opr_end $last_index
			incr last_index $operand_len

			set operand [string trimright $operand "\t "]
			if {$validation_L1} {
				add_aperand_to__opr_types
			}
			highlight_operand
			incr operands_count

			# highlight operand separator
			if {[string index $data 0] == {,}} {
				set sep_end $last_index
				incr sep_end
				$editor tag add tag_oper_sep $lineNumber.$last_index $lineNumber.$sep_end
				if {$validation_L0 && ![regexp {[\w$]} $data]} {
					$editor tag add tag_error $lineNumber.$last_index $lineNumber.$sep_end
				}
				incr last_index
				set data [string range $data 1 end]
				set original_data [string range $original_data 1 end]
			}

			incr i
		}
	}

	## Append current operand (var. operand) to list of operand types
	 #+ on current line
	 # @return void
	proc add_aperand_to__opr_types {} {
		variable opr_types	;# List of operand types
		variable operand	;# Data of the current operand

		set opr [string toupper $operand]

		switch -- [string index $opr 0] {
			{#}	{lappend opr_types {#}}
			{/}	{lappend opr_types {/}}
			{@}	{lappend opr_types $opr}
			default	{
				if {[lsearch -ascii -exact {R0 R1 R2 R3 R4 R5 R6 R7 DPTR A AB C} $opr] != -1} {
					lappend opr_types $opr
				} else {
					lappend opr_types {D}
				}
			}
		}
	}

	## Highlight current operand
	 # @return void
	proc highlight_operand {} {
		variable editor		;# ID of the text widget
		variable operand	;# Data of the current operand
		variable opr_end	;# End index of the current operand
		variable opr_start	;# Start index of the current operand
		variable spec_registers	;# SFR registers
		variable spec_bits	;# SFR bits
		variable validation_L0	;# Bool: Basic validation enabled
		variable inline_asm	;# Is inline assembler
		variable lineNumber	;# Number of current line

		## Determinate addressing type
		set addr_type [string index $operand 0]

		# Immediate adresing
		if {$addr_type == {#}} {
			set operand [string range $operand 1 end]

			# Immediate char value
			if {[string index $operand 0] == {'} && [string index $operand end] == {'}} {
				set len [string length $operand]
				if {$validation_L0 && $len < 3} {
					put_tag_on_operand tag_error
				}
				if {$len > 3 && [string index $operand 1] != "\\"} {
					put_tag_on_operand tag_string
				} else {
					put_tag_on_operand tag_imm_char
				}

			# Label in inline assembler
			} elseif {[regexp {^\w+\$$} $operand]} {
				put_tag_on_operand tag_imm_constant

			# Operand has no value => incorrect operand
			} elseif {[regexp { |\(|\)|\+|\-|\%|\=|\>|\<|\*|\/} $operand]} {
				parse_expression $operand $opr_start $opr_end
				$editor tag add tag_symbol	\
					$lineNumber.$opr_start $lineNumber.$opr_start+1c

			} elseif {
				$validation_L0 &&
				([string length $operand] == 0 || ![regexp {^(\?\?)?[\w\$\.\\]+$} $operand])
			} then {
				put_tag_on_operand tag_error

			# Operand value determinated successfully
			} else {
				parse_operand_auxiliary2 {
					tag_imm_unknown		tag_imm_hex	tag_imm_dec
					tag_imm_oct		tag_imm_bin	tag_imm_char
					tag_imm_constant	tag_string
				}
			}

		# Indirect adresing
		} elseif {$addr_type == {@}} {
			set operand [string range $operand 1 end]
			put_tag_on_operand tag_indirect

			# Check for operand validity
			if {!$validation_L0} {return}
			set operand [string toupper $operand]
			if {
				$operand != {R0}	&&
				$operand != {R1}	&&
				$operand != {DPTR}	&&
				$operand != {A+PC}	&&
				$operand != {A+DPTR}
			} then {
				put_tag_on_operand tag_error
			}

		# Direct bit adresing
		} elseif {$addr_type == {/}} {
			set operand [string range $operand 1 end]

			if {[regexp {\(|\)|\+|\-|\%|\=|\>|\<|\*|\/} $operand]} {
				parse_expression $operand $opr_start $opr_end
				$editor tag add tag_symbol	\
					$lineNumber.$opr_start $lineNumber.$opr_start+1c

			} elseif {
				$validation_L0 &&
				([string length $operand] == 0 || ![regexp {^'?[\w\.]+'?$} $operand])
			} then {
				# Operand has no value => incorrect operand
				put_tag_on_operand tag_error

			} else {
				parse_operand_auxiliary $spec_bits {
					tag_unknown_base	tag_hex		tag_dec
					tag_oct			tag_bin		tag_char
					tag_constant		tag_string
				}
			}

		# Another kind of direct adresing
		} else {
			parse_operand_auxiliary $spec_registers {
				tag_unknown_base	tag_hex		tag_dec
				tag_oct			tag_bin		tag_char
				tag_constant		tag_string
			}
		}
	}

	## Auxiliary procedure for procedure highlight_operand
	 # @parm List SFR_set	- List of SFR keywords
	 # @parm List tag_list	- List of tags for procedure parse_operand_auxiliary2
	 # @return void
	proc parse_operand_auxiliary {SFR_set tag_list} {
		variable operand	;# Data of the current operand

		# SFR
		if {[lsearch -ascii -exact $SFR_set [string toupper $operand]] != -1} {
			put_tag_on_operand tag_sfr

		# Something else than SFR
		} else {
			parse_operand_auxiliary2 $tag_list
		}
	}

	## Auxiliary procedure for procedures highlight_operand and parse_operand_auxiliary
	 # @parm List tag_list - list of text tags (see code)
	 # @return void
	proc parse_operand_auxiliary2 {tag_list} {
		variable operand	;# Data of the current operand
		variable opr_start	;# Start index of the current operand
		variable opr_end	;# End index of the current operand
		variable editor		;# ID of the text widget
		variable lineNumber	;# Number of current line
		variable spec_registers	;# SFR registers
		variable validation_L0	;# Bool: Basic validation enabled
		variable inline_asm	;# Is inline assembler

		# Label in inline assembler
		if {$inline_asm && [regexp {^\w+\$$} $operand]} {
			put_tag_on_operand [lindex $tag_list 6]

		# Expression
		} elseif {[regexp {\(|\)|\+|\-|\%|\=|\>|\<|\*|\/} $operand]} {
			parse_expression $operand $opr_start $opr_end

		# Dot notation (bit addressing)
		} elseif {[regexp {^\w+\.\w+$} $operand]} {
			set opr [split $operand {.}]
			set operand [lindex $opr 0]

			set opr_true_end $opr_end
			set opr_end $opr_start
			incr opr_end [string length $operand]

			parse_operand_auxiliary $spec_registers $tag_list

			set opr_start [expr {$opr_end + 1}]
			$editor tag add tag_symbol $lineNumber.$opr_end $lineNumber.$opr_start

			set opr_end $opr_true_end
			set operand [lindex $opr 1]

			parse_operand_auxiliary2 $tag_list

		# Direct value
		} elseif {[regexp {^(\d|')} $operand]} {
			# gain information about the openand (radix and decimal value)
			set opr_info [which_radix 0 $operand]
			set opr_base [lindex $opr_info 0]
			set opr_in_dec [lindex $opr_info 1]

			# Radix determinated incorrectly => unknown number
			if {$opr_base == {}} {
				put_tag_on_operand [lindex $tag_list 0]

				if {$validation_L0 && ![regexp {^\d+$} $operand]} {
					put_tag_on_operand tag_error
				}

			# Radix determinated correctly - continue normaly
			} else {
				# check for allowed operand value range
				if {$validation_L0 && $opr_in_dec == {error}} {

					## Operand value is invalid => incorrect operand
					put_tag_on_operand tag_error

				} else {
					if {$validation_L0 && ($opr_in_dec > 65535 || $opr_in_dec < 0)} {

						## Operand value is out of range => incorrect operand
						put_tag_on_operand tag_error
					}
				}

				# highlight according to numeric base
				switch -- $opr_base {
					{hex} 		{put_tag_on_operand [lindex $tag_list 1]}
					{dec} 		{put_tag_on_operand [lindex $tag_list 2]}
					{oct} 		{put_tag_on_operand [lindex $tag_list 3]}
					{bin} 		{put_tag_on_operand [lindex $tag_list 4]}
					{ascii} 	{put_tag_on_operand [lindex $tag_list 5]}
					{string} 	{put_tag_on_operand [lindex $tag_list 7]}
				}
			}

		# Defined as a symbolic name
		} else {
			put_tag_on_operand [lindex $tag_list 6]
			if {
				$validation_L0 && ($operand != {$}) && ![regexp {^(\?\?)?\w+$} $operand]
			} then {
				put_tag_on_operand tag_error
			}
		}
	}

	## Highlight current operand by the given tag
	 # @parm String tag_name - tag name
	 # @return void
	proc put_tag_on_operand {tag_name} {
		variable lineNumber	;# Number of current line
		variable opr_end	;# End index of the current operand
		variable opr_start	;# Start index of the current operand
		variable editor		;# ID of the text widget

		$editor tag add $tag_name $lineNumber.$opr_start $lineNumber.$opr_end
	}

	## Determinate numeric base of the given number
	 # @parm Bool norange	- 1 == determinate decimal value (sometimes...) and validate it (see code)
	 # @parm String number	- number to analyze
	 # @return List - {base decimal_value} or {base "error"}
	proc which_radix {norange number} {
		# Handle prefix notation for hexadecimal numbers, like 0xfa
		if {
			[string index $number 0] == {0}
				&&
			([string index $number 1] == {x} || [string index $number 1] == {X})
				&&
			[string is xdigit [string index $number 2]]
		} then {
			set number [string replace $number 0 1]
			append number {h}
		}

		set original_len [string length $number]
		set len [string length [string trimleft $number {0}]]
		if {$original_len > 1 && $len == 1} {
			incr len
		}
		incr len -1
		set radix [string index $number end]
		set number [string range $number 0 {end-1}]
		set dec_val error
		set base {}

		# Character or string
		if {$radix == {'}} {
			if {[string index $number 0] == {'}} {
				set number [string range $number 1 end]

				set base {ascii}
				if {[string length $number] == 1 || [string index $number 0] == "\\"} {
					set dec_val 0

				} elseif {[string length $number] > 1} {
					set base {string}
					set dec_val 0
				}
			}

		# Regular numbers
		} else {
			set radix [string tolower $radix]
			switch -- $radix {
				{h} {	;# Hexadecimal
					set base hex
					if {$norange || ($len <= 4 && $len >= 1)} {
						if {[regexp {^[A-Fa-f0-9]*$} $number]} {
							set dec_val 0
						}
					}
				}
				{d} {	;# Decimal
					set base dec
					if {$norange || ($len <= 5 && $len >= 1)} {
						if {[regexp {^[0-9]*$} $number]} {
							set dec_val $number
						}
					}
				}
				{o} {	;# Octal
					set base oct
					if {$norange} {
						if {[regexp {^[0-7]*$} $number]} {
							set dec_val 0
						}
					} elseif {$len <= 6 && $len >= 1} {
						if {[regexp {^[0-7]*$} $number]} {
							if {$len != 3} {
								set dec_val 0
							} else {
								if {[string index $number 0] <= 3} {
									set dec_val 0
								}
							}
						}
					}
				}
				{q} {	;# Octal
					set base oct
					if {$norange} {
						if {[regexp {^[0-7]*$} $number]} {
							set dec_val 0
						}
					} elseif {$len <= 6 && $len >= 1} {
						if {[regexp {^[0-7]*$} $number]} {
							if {$len != 3} {
								set dec_val 0
							} else {
								if {[string index $number 0] <= 3} {
									set dec_val 0
								}
							}
						}
					}
				}
				{b} {	;# Binary
					set base bin
					if {$norange || ($len <= 16 && $len >= 1)} {
						if {[regexp {^[01]*$} $number]} {
							set dec_val 0
						}
					}
				}
				default {	;# Default
					set dec_val {}
				}
			}
		}

		# done ...
		return [list $base $dec_val]
	}

	## Highlight expressions (eg. '( 10d - X MOD 55h)')
	 # @parm String data		- expression to highlight
	 # @parm Int start_index	- expresssion start index
	 # @parm Int end_index		- expresssion end index
	 # @return void
	proc parse_expression {data start_index end_index} {

		variable editor			;# ID of the text widget
		variable lineNumber		;# Number of current line
		variable expr_symbols		;# symbol operators
		variable expr_instructions	;# word operators
		variable validation_L0		;# Bool: Basic validation enabled
		variable validation_L1		;# Bool: Advancet validation enabled

		# Adjust data to fit the given boundaries
		set data_len [string length $data]
		set dif [expr {$end_index - $start_index - $data_len}]
		if {$dif != 0} {
			set space [string repeat { } $dif]
			set data $space$data
		}

		# Remove strings
		set e_idx 0
		while {1} {
			if {![regexp -start $e_idx -- {'[^']*'} $data string_data]} {
				break
			}
			set len		[string length $string_data]
			set s_idx	[string first {'} $data $e_idx]
			set e_idx	[expr {$s_idx + $len}]

			if {$len > 2} {
				set data [string replace $data			\
					[expr {$s_idx + 1}] [expr {$e_idx - 2}]	\
					[string repeat { } [expr {$len - 2}]]	\
				]
			}
		}

		# remove and highlight '('
		set opened_par 0
		while {1} {
			set symbol_idx [string first {(} $data]
			if {$symbol_idx == -1} {break}

			incr opened_par
			set data [string replace $data $symbol_idx $symbol_idx { }]
			incr symbol_idx $start_index
			$editor tag add tag_symbol $lineNumber.$symbol_idx $lineNumber.[expr {$symbol_idx + 1}]
		}
		# remove and highlight ')'
		while {1} {
			set symbol_idx [string first {)} $data]
			if {$symbol_idx == -1} {break}

			incr opened_par -1
			set data [string replace $data $symbol_idx $symbol_idx { }]
			incr symbol_idx $start_index
			$editor tag add tag_symbol $lineNumber.$symbol_idx $lineNumber.[expr {$symbol_idx + 1}]
		}
		# chcek if parenthesies are balanced
		if {$validation_L0 && $opened_par != 0} {
			$editor tag add tag_error $lineNumber.$start_index $lineNumber.$end_index
		}

		# Highlight exprression symbols (+1 chars) and remove them from the string
		set adjusted_data [string toupper $data]
		regsub -all {\t} $adjusted_data { } adjusted_data
		append adjusted_data { }
		foreach symbol $expr_instructions {
			while {1} {
				set symbol_idx [string first " $symbol " $adjusted_data]
				if {$symbol_idx == -1} {break}
				set original_symbol_idx $symbol_idx

				set space_len [string length $symbol]
				incr space_len 1
				set symbol_end_index $symbol_idx
				incr symbol_end_index $space_len
				set symbol_end_index_org_1 [expr {$symbol_end_index + 1}]

				incr space_len
				set space [string repeat { } $space_len]
				set adjusted_data [string replace $adjusted_data $symbol_idx $symbol_end_index $space]
				set data [string replace $data $symbol_idx $symbol_end_index $space]

				incr symbol_idx $start_index
				incr symbol_end_index $start_index
				$editor tag add tag_symbol $lineNumber.$symbol_idx $lineNumber.$symbol_end_index

				if {$validation_L1} {
					set tmp [string range $data $symbol_end_index_org_1 end]
					set tmp [string toupper [string trim $tmp]]
					if {![string length $tmp]} {
						$editor tag add tag_error			\
							$lineNumber.[expr {$symbol_idx + 1}]	\
							$lineNumber.$symbol_end_index
					} else {
						foreach smb $expr_instructions {
							if {![string first $smb $tmp]} {
								$editor tag add tag_error			\
									$lineNumber.[expr {$symbol_idx + 1}]	\
									$lineNumber.$symbol_end_index
								break
							}
						}
					}
				}
			}
		}
		# Highlight expression symbols (1 char) and remove them from the string
		foreach symbol $expr_symbols {
			while {1} {
				set symbol_idx [string first $symbol $data]
				if {$symbol_idx == -1} {break}
				set original_symbol_idx $symbol_idx
				set symbol_idx_org_1 [expr {$symbol_idx + 1}]

				set data [string replace $data $symbol_idx $symbol_idx { }]
				incr symbol_idx $start_index
				set symbol_idx_1 [expr {$symbol_idx + 1}]
				$editor tag add tag_symbol $lineNumber.$symbol_idx $lineNumber.$symbol_idx_1

				if {
					$validation_L0 && (
						!$original_symbol_idx
							||
						![regexp {^\s*((\'\\?[^']+\')|\w|\$)} [string range $data $symbol_idx_org_1 end]]
					)
				} then {
					$editor tag add tag_error	\
						$lineNumber.$symbol_idx	\
						$lineNumber.$symbol_idx_1
				}
			}
		}

		# Highlight other parts
		set last_index $start_index
		set original_data $data
		set data [hide_strings $data]
		while {1} {

			if {![regexp {[^\s]+} $data value]} {break}

			set value_S_idx [string first $value $data]
			set value_len [string length $value]
			set value_E_idx $value_len
			incr value_E_idx $value_S_idx

			set value [string range $original_data $value_S_idx $value_E_idx]

			set data [string range $data $value_E_idx end]
			set original_data [string range $original_data $value_E_idx end]

			set tmp_idx $value_E_idx
			incr value_S_idx $last_index
			incr value_E_idx $last_index
			incr last_index $tmp_idx

			highlight_value [string trimright $value] $value_S_idx $value_E_idx
		}
	}

	## Highlight constant values
	 # @parm String data		- string to highlight
	 # @parm Int start_index	- start index
	 # @parm Int end_index		- end index
	 # @return void
	proc highlight_value {data start_index end_index} {
		variable editor		;# ID of the text widget
		variable lineNumber	;# Number of current line
		variable validation_L0	;# Bool: Basic validation enabled
		variable spec_registers	;# SFR registers

		# Dot notation -- bit addressing
		if {[regexp {^\w+\.\w+$} $data]} {
			set data [split $data {.}]

			set end_index_org $end_index
			set end_index $start_index
			incr end_index [string length [lindex $data 0]]
			highlight_value [lindex $data 0] $start_index $end_index

			$editor tag add tag_symbol $lineNumber.$end_index $lineNumber.[expr {$end_index + 1}]

			incr end_index
			highlight_value [lindex $data 1] $end_index $end_index_org
			return

		} elseif {[regexp {^(\d|')} $data]} {
			# Gain information about the value
			set opr_info [which_radix 1 [$editor get $lineNumber.$start_index $lineNumber.$end_index]]
			set opr_base [lindex $opr_info 0]
			set opr_in_dec [lindex $opr_info 1]

			# Highlight value according to info
			if {$opr_base == {}} {
				$editor tag add tag_unknown_base $lineNumber.$start_index $lineNumber.$end_index
				if {$validation_L0 && ![regexp {^[0-9A-Fa-f]+$} $data]} {
					$editor tag add tag_error $lineNumber.$start_index $lineNumber.$end_index
				}
				return
			}
			if {$validation_L0 && $opr_in_dec == {error}} {
				$editor tag add tag_error $lineNumber.$start_index $lineNumber.$end_index
			}

			# Highlight according to numeric base
			switch -- $opr_base {
				{hex} { 	;# Hexadecimal
					$editor tag add tag_hex $lineNumber.$start_index $lineNumber.$end_index
				}
				{dec} { 	;# Decimal
					$editor tag add tag_dec $lineNumber.$start_index $lineNumber.$end_index
				}
				{oct} { 	;# Octal
					$editor tag add tag_oct $lineNumber.$start_index $lineNumber.$end_index
				}
				{bin} { 	;# Binary
					$editor tag add tag_bin $lineNumber.$start_index $lineNumber.$end_index
				}
				{ascii} { 	;# Char
					$editor tag add tag_char $lineNumber.$start_index $lineNumber.$end_index
				}
				{string} { 	;# String
					$editor tag add tag_string $lineNumber.$start_index $lineNumber.$end_index
				}
			}
			return
		}

		# Constant
		if {[lsearch -ascii -exact $spec_registers [string toupper $data]] != -1} {
			set tag tag_sfr
		} else {
			set tag tag_constant
		}
		$editor tag add $tag $lineNumber.$start_index $lineNumber.$end_index
		if {$validation_L0 && ![regexp {^(((\?\?)?\w+)|\$)$} $data]} {
			$editor tag add tag_error $lineNumber.$start_index $lineNumber.$end_index
		}
	}

	## Replace all single quoted string with underscores (''abc'' -> '_____')
	 # @parm String data - input data
	 # @return String - output data
	proc hide_strings {data} {
		# Return string which dowsn't contain '''
		if {[string first {'} $data] == -1} {return $data}

		# Perform replacement
		while {1} {
			if {![regexp {'[^']*'} $data string]} {
				break
			}
			regsub {'[^']*'} $data [string repeat {_}	\
					[string length $string]		\
				] data
		}

		# Return result
		return $data
	}
}

# Initialize some namespace variables
foreach item ${::ASMsyntaxHighlight::all_controls} {
	lappend ::ASMsyntaxHighlight::all_controls__with_dolar "\$$item"
}

# >>> File inclusion guard
}
# <<< File inclusion guard