Hightlight a textarea?

BlitzMax Forums/BlitzMax GUI Programming/Hightlight a textarea?

Sanctus
 #1
How can I do that?
I tryed to write some code that looks like this
Local txt:String = TextAreaText(ScriptEditTA)
					txt = txt.ToLower()
					For Local i:Int = 0 To KeyWords.Length - 1
						Local lp:Int = -1
						Local KW:String = KeyWords[i].ToLower()
						lp = txt.Find(KW, lp + 1)
						While(lp >= 0)
							Local l:Int = Len(KW)
							SetTextAreaText(ScriptEditTA, KeyWords[i], lp, l)
							FormatTextAreaText(ScriptEditTA, 0, 0, 255, TEXTFORMAT_BOLD, lp, l)
							lp = txt.Find(KW, lp + 1)
						Wend
					Next

but if I write something it colors all the words after that keywords.

klepto2
 #2
AS far as I remember you have to reset the Format after you have formatted a piece of the text.
eg: FormatTextAreaText(scriptEditTA,0,0,0,0,lp+1,1)

Also just 3 things I have noticed:
I don't know how much keywords you have, but it may be faster to switch to TMaps instead of using arrays. The main advantage is you are able to add the heyword and maybe a keyword type which stores color,format and other things. So you can have different keywordstyles easily.
The other thing, you should get rid of the While loop. Try something like FormatTextAreaText(...,...,...,...,...,lp,KeyWords[i].length)
Also try to avoid to update the whole text at once. Use the hooks and after an inital load, you should only update on a perline basis.

I have some highlighter code flying around here, if you're interrested I can upload it.

SebHoll
 #3
Try using SetGadgetTextColor() before parsing and highlighting using FormatTextAreaText to set the base colour of the text.

Dabhand
 #4
Here you go:-

Framework MaxGUI.MaxGUI
Import BRL.EventQueue
Import BRL.Retro
Import MaxGui.Drivers

SuperStrict 

Local window:TGadget = CreateWindow("SPad",30,20,400,300,Desktop(),WINDOW_TITLEBAR | WINDOW_MENU | WINDOW_STATUS)
Local textarea:TGadget = CreateTextArea(0,0,ClientWidth(window),ClientHeight(window),window)
SetTextAreaColor(textarea,1,81,107,True)
SetTextAreaColor(textarea,255,255,255,False)


'Menu
Local filemenu:TGadget

Const MENU_OPEN:Int=101

filemenu=CreateMenu("&File",0,WindowMenu(window))

CreateMenu"&Open",MENU_OPEN,filemenu,KEY_O,MODIFIER_COMMAND
UpdateWindowMenu window

While True 
	PollEvent()
	
	Select EventID()
		Case EVENT_GADGETACTION
			Select(EventSource())
				Case textarea
					FormatLine(textarea)
			End Select 
		
		Case EVENT_WINDOWCLOSE
			End

		Case EVENT_MENUACTION
			Select EventData()					
				Case MENU_OPEN
					Local result:String = RequestFile("Open file...","All files:*",False)
					If result <> ""
						SetTextAreaText(textArea,LoadText$(result))
						FormatDocument(textArea)
					End If 
			End Select
	End Select

Wend 
		
Function FormatLine(textArea:TGadget)
	Local cursorpos:Int
	Local currentline:Int, lineString:String 
	Local lineCharStart:Int, lineCharEnd:Int
	
	cursorpos=TextAreaCursor(textArea)
	currentLine = TextAreaLine(textArea,cursorPos)
	lineCharStart = TextAreaChar(textArea,currentLine)
	lineString = ""
		
	For Local loop:Int = lineCharStart To TextAreaLen(textArea)
		Local char:String = TextAreaText$(textArea,loop,1)
		If (TextAreaLine(textArea,loop) <> currentLine) Or (loop = TextAreaLen(textArea))
			lineCharEnd = loop-1
			Exit
		End If
		lineString = lineString + char
	Next 
		
	Local lex:TLexer = New TLexer
	If lineString <> ""
		lex.mLexLine(lineString)
	End If
		
	Local r:Int,g:Int,b:Int,flag:Int
	Local inTag:Byte = False
	
	For Local loop:Int = 0 To lex.iTokenAmount
		r = 255 ; g = 255 ; b = 255 ; flag = 0
		Local tempToken:String = lex.sTokenBank[loop]
			
		If tempToken = "<"
			r = 0 ; g = 255 ; b = 255
			inTag = True 
		End If
			
		If tempToken = ">"
			r = 0 ; g = 255 ; b = 255
			inTag = False 
		End If 
			
		If tempToken = "/" Or tempToken = "!"
			If lex.sTokenBank[loop-1] = "<"
				r = 255 ; g = 255 ; b = 50
				flag = TEXTFORMAT_BOLD
			End If
		End If
			
		For Local keyWordLoop:Int = 0 To lex.sKeywords.length-1
			If intag = True 
				If lex.sKeywords[KeyWordLoop] = tempToken
					r = 255 ; g = 255 ; b = 50
					flag = TEXTFORMAT_BOLD
					Exit 
				End If
			End If 
						
			If tempToken = "h"
				If lex.sTokenBank[loop-1] = "<" Or lex.sTokenBank[loop-1] = "/"
					r = 255 ; g = 255 ; b = 50
					flag = TEXTFORMAT_BOLD
				End If
			End If  
		Next
			
		If Left$(tempToken,1) = "~q"
			r = 50 ; g = 255 ; b = 50
		End If 
			
		For Local numbersLoop:Int = 0 To lex.sNumbers.length-1
			If lex.sNumbers[numbersLoop] = Left$(tempToken,1)
				r = 192 ; g = 192 ; b = 192
				If lex.sTokenBank[loop-1] = "h"
					r = 255 ; g = 255 ; b = 50
					flag = TEXTFORMAT_BOLD
				End If
				Exit 
			End If
		Next
			
		SetTextAreaText(textArea,tempToken,lineCharStart,Len(tempToken))
		FormatTextAreaText(textArea,r,g,b,flag,lineCharStart,Len(tempToken))
		lineCharStart = lineCharStart+Len(tempToken)
	Next
End Function

Function FormatDocument(textArea:TGadget)
	Local lineCount:Int = TextAreaLine(textArea,TextAreaLen(textArea))
	Local currentline:Int, lineString:String 
	Local lineCharStart:Int, lineCharEnd:Int
						
						
	For Local loopx:Int = 0 To lineCount	
		lineCharStart = TextAreaChar(textArea,loopx)
		lineString = ""
		
		For Local loop:Int = lineCharStart To TextAreaLen(textArea)
			Local char:String = TextAreaText$(textArea,loop,1)
			 			
			If (TextAreaLine(textArea,loop) <> loopx) Or (loopx = TextAreaLen(textArea))
				lineCharEnd = loop-1
				Exit
			End If
			lineString = lineString + char
		Next 
		
		Local lex:TLexer = New TLexer
					
		lex.mLexLine(lineString)
					
		Local r:Int,g:Int,b:Int,flag:Int
		Local inTag:Byte = False 
		
		For Local loop:Int = 0 To lex.iTokenAmount
			r = 255 ; g = 255 ; b = 255 ; flag = 0
			Local tempToken:String = lex.sTokenBank[loop]
			
			If tempToken = "<"
				r = 0 ; g = 255 ; b = 255
				inTag = True 
			End If
			
			If tempToken = ">"
				r = 0 ; g = 255 ; b = 255
				inTag = False 
			End If 
			
			If tempToken = "/" Or tempToken = "!"
				If lex.sTokenBank[loop-1] = "<"
					r = 255 ; g = 255 ; b = 50
					flag = TEXTFORMAT_BOLD
				End If
			End If
			
			For Local keyWordLoop:Int = 0 To lex.sKeywords.length-1
				If intag = True 
					If lex.sKeywords[KeyWordLoop] = tempToken
						r = 255 ; g = 255 ; b = 50
						flag = TEXTFORMAT_BOLD
						Exit 
					End If
							
					If tempToken = "h"
						If lex.sTokenBank[loop-1] = "<" Or lex.sTokenBank[loop-1] = "/"
							r = 255 ; g = 255 ; b = 50
							flag = TEXTFORMAT_BOLD
						End If  
					End If
				End If  
			Next
			
		If Left$(tempToken,1) = "~q"
			r = 50 ; g = 255 ; b = 50
		End If 
			
		For Local numbersLoop:Int = 0 To lex.sNumbers.length-1
			If lex.sNumbers[numbersLoop] = Left$(tempToken,1)
				r = 192 ; g = 192 ; b = 192
				
				If lex.sTokenBank[loop-1] = "h"
					r = 255 ; g = 255 ; b = 50
					flag = TEXTFORMAT_BOLD
				End If
				
				Exit 
			End If
		Next
			
		SetTextAreaText(textArea,tempToken,lineCharStart,Len(tempToken))
		FormatTextAreaText(textArea,r,g,b,flag,lineCharStart,Len(tempToken))
		
		lineCharStart = lineCharStart+Len(tempToken)
	Next
Next
End Function




Type TLexer
	Field sSymbols:String[] = [" ","+","-","*","^","/","%","=",">","<",":","{","}","[","]","(",")",";","&"]
	 
	Field sAlpha:String[] = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","Z","B","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","_"]
	
	Field sNumbers:String[] = ["0","1","2","3","4","5","6","7","8","9","."]
	
	Field sKeywords:String[] = ["body","doctype","head","html","meta","address","blockquote","br","div","em","h1","h2","h3","h4","h5","h6","p","pre","strong","sub","sup","b","big","hr","i","small","tt","dd","dl","dt","li","ol","ul","a","caption","table","td","th","tr","frame","frameset","iframe","noframes","img","map","object","style","button","form","input","label","legend","option","select","textarea","script","noscript"]
	Field sTok:String = ""
	Field bInStruct:Byte, sCurrentStructIdentifier:String 

	Field iTOKENS_PER_LINE:Int = 512
	Field sTokenBank:String[iTOKENS_PER_LINE] 
	Field iTokenAmount:Int
	'Field lstTokenList:TList = New TList 
	Field lstSymbolTable:TList = New TList
	
	Field TYPE_UNKNOWN:Int = 0, TYPE_STRING:Int = 1, TYPE_IDENTIFIER:Int = 2, TYPE_COMMAND:Int = 3, TYPE_INTEGER:Int = 4, TYPE_FLOAT:Int = 5
	Field TYPE_SYMBOL:Int = 6, TYPE_VARIABLE:Int = 7, TYPE_CONSTANT:Int = 8, TYPE_FUNCTION:Int = 9,TYPE_ARRAY:Int = 10, TYPE_STRUCT:Int = 11
	
	Field DATA_UNKNOWN:Int = 0, DATA_INTEGER:Int = 1, DATA_FLOAT:Int = 2, DATA_STRING:Int = 3
	
	Method TokenAmount:Int()
		Return(iTokenAmount)
	End Method
	
	Method mLexLine:Int(sLinein:String)
		Local sTempToken:String 
		Local iLoopLine:Int, iLoopOther:Int, sChar:String
		Local bInString:Byte = False 
		
		iTokenAmount = 0 
'		lstTokenList.Clear()
		
		For iLoopOther = 0 To iTOKENS_PER_LINE-1
			sTokenBank[iLoopOther] = ""
		Next
		
		sLinein = sLinein + " "
			For iLoopLine = 1 To Len(sLinein)		
				sChar = Mid$(sLinein,iLoopLine,1)
								
				
				If sChar = "/"
					If Mid$(sLinein,iLoopLine+1,1) = "/" Then Exit 
				End If 
				
				'check for strings
				If sChar = "~q"
					sTempToken = sChar
					For iLoopLine = iLoopLine+1 To Len(sLinein)
						sChar = Mid$(sLinein,iLoopLine,1)
						If sChar = "~q" Then Exit
						sTempToken = sTempToken + sChar
					Next
					sTempToken = sTempToken + sChar
					iLoopLine = iLoopLine
					iTokenAmount = iTokenAmount + 1
					sTokenBank[iTokenAmount] = sTempToken
					sTempToken = ""  
				End If
				
				Local bDoExit:Byte
				'Check for letters such as commands or identifiers
				For iLoopOther = 0 To sAlpha.length-1
					
					If sChar = sAlpha[iLoopOther]
						sTempToken = sChar
						For iLoopLine = iLoopLine+1 To Len(sLinein) 
							  
							sChar = Mid$(sLinein,iLoopLine,1)
							For iLoopOther = 0 To sAlpha.length-1
								If sChar <> sAlpha[iLoopOther]
									bDoExit = True  
								End If
								
								If sChar = sAlpha[iLoopOther]
									sTempToken = sTempToken + sChar
									bDoExit = False
									Exit
								End If 
							Next
							If bDoExit = True
								iLoopLine = iLoopLine - 1
								iTokenAmount = iTokenAmount + 1
								sTokenBank[iTokenAmount] = Lower$(sTempToken)
								sTempToken = ""
								sChar = "" 
								Exit 
							End If
						Next
					End If
					If bDoExit = True Then Exit 
				Next
				
				'Check for numbers, including floats:-
				bDoExit = False 
				For iLoopOther = 0 To sNumbers.length-1
					
					If sChar = sNumbers[iLoopOther]
						sTempToken = sChar
						For iLoopLine = iLoopLine+1 To Len(sLinein) 
							  
							sChar = Mid$(sLinein,iLoopLine,1)
							For iLoopOther = 0 To sNumbers.length-1
								If sChar <> sNumbers[iLoopOther]
									bDoExit = True  
								End If
								
								If sChar = sNumbers[iLoopOther]
									sTempToken = sTempToken + sChar
									bDoExit = False
									Exit
								End If 
							Next
							If bDoExit = True
								iLoopLine = iLoopLine - 1
								iTokenAmount = iTokenAmount + 1
								sTokenBank[iTokenAmount] = sTempToken
								sTempToken = ""
								sChar = "" 
								Exit 
							End If
						Next
					End If
					If bDoExit = True Then Exit 
				Next
				
				For iLoopOther = 0 To sSymbols.length-1
					If sChar = sSymbols[iLoopOther]
						sTempToken = sChar
						iTokenAmount = iTokenAmount + 1
						sTokenBank[iTokenAmount] = sTempToken
						sTempToken = ""
						sChar = "" 
						Exit 
					End If
				Next 
				
				If sChar = " "
					iTokenAmount = iTokenAmount + 1
					sTokenBank[iTokenAmount] = sTempToken
					sTempToken = ""
					sChar = ""
				End If
				
				If sChar = "~t"
					iTokenAmount = iTokenAmount + 1
					sTokenBank[iTokenAmount] = sTempToken
					sTempToken = ""
					sChar = ""
				End If
			Next
			iTokenAmount = iTokenAmount - 1
		Return(iTokenAmount)
	End Method 
End Type


It formats the text when it encounters html tags, so load a short html page and you'll see it formats the lot, as well as when your typing! :)

Dabz