500 lines
19 KiB
Standard ML
500 lines
19 KiB
Standard ML
signature TEXT_BUILDER =
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sig
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(* Prerequisite: LineGap is moved to requested line first. *)
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val build: int * int * LineGap.t * int * int
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-> MailboxType.t list
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end
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structure TextBuilder :> TEXT_BUILDER =
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struct
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val xSpace = 13
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val xSpace3 = xSpace * 3
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val ySpace = 25
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val fontSize = 30.0
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fun accToDrawMsg (textAcc, cursorAcc) =
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let
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open MailboxType
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open DrawMsg
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val textAcc = Vector.concat textAcc
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val cursorAcc = Vector.concat cursorAcc
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val textMsg = REDRAW_TEXT textAcc
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val cursorMsg = REDRAW_CURSOR cursorAcc
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in
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[DRAW textMsg, DRAW cursorMsg]
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end
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fun buildCursor (posX, posY, fWindowWidth, fWindowHeight, r, g, b) =
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let
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val left = posX + 9
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val left = Real32.fromInt left
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val right = left + 12.0
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val top = Real32.fromInt posY
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val bottom = top + fontSize + 2.0
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val halfHeight = fWindowHeight / 2.0
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val top = (~(top - halfHeight)) / halfHeight
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val bottom = (~(bottom - halfHeight)) / halfHeight
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val halfWidth = fWindowWidth / 2.0
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val left = (left - halfWidth) / halfWidth
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val right = (right - halfWidth) / halfWidth
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val vec =
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#[ left, top, r, g, b
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, right, top, r, g, b
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, left, bottom, r, g, b
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, left, bottom, r, g, b
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, right, bottom, r, g, b
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, right, top, r, g, b
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]
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in
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[vec]
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end
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(* builds text from a string with char-wrap.
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* char-wrap is a similar concept to word-wrap,
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* but it breaks on character in the middle of a word.
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*
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* Will likely want multiple versions of these two mutually recursive
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* functions for each selection and cursor type:
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* cursor over an individual character,
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* range selection where multiple characters are selected, etc.
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*
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* Todo:
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* - Possibly add visual horizontal indentation when char-wrap occurs
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* on an indented line *)
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fun buildTextStringAfterCursor
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( pos, str, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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) =
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if pos < String.size str then
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case String.sub (str, pos) of
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#" " =>
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(* if space, then proceed forward one char
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* without adding to acc *)
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buildTextStringAfterCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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| #"\t" =>
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(* if tab, proceed forward one char,
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* and jump visually forwards three chars *)
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buildTextStringAfterCursor
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( pos + 1, str, acc, posX + xSpace3, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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| #"\n" =>
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(* if \n, move down vertically, and move to start horizontally
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* assuming we have not exceeded the window's height.
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* If we have exceeded the window's height, just return acc. *)
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if posY + ySpace < windowHeight then
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buildTextStringAfterCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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else
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(* return if there is no more vertical space after line break *)
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accToDrawMsg (acc, cursorAcc)
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| #"\r" =>
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(* same as \n, except we also check if we are in a \r\n pair,
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* and proceed two characters forward if so *)
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if posY + ySpace < windowHeight then
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if
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pos < String.size str - 1
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andalso String.sub (str, pos + 1) = #"\n"
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then
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buildTextStringAfterCursor
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( pos + 2, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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else
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buildTextStringAfterCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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else
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(* return if there is no more vertical space after line break *)
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accToDrawMsg (acc, cursorAcc)
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| chr =>
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(* for any other character, add it to acc if there is space,
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* and proceed forward one character in the string *)
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let
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val chrFun = Vector.sub (CozetteAscii.asciiTable, Char.ord chr)
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in
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if posX + xSpace < windowWidth then
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(* if there is horizontal space, place char on the right *)
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let
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val chrVec = chrFun
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(posX, posY, fontSize, fontSize, fWindowWidth, fWindowHeight, r, g, b)
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val acc = chrVec :: acc
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in
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buildTextStringAfterCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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end
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else if posY + ySpace < windowHeight then
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(* if there is vertical space, place char down below at startX *)
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let
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val chrVec = chrFun
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( startX, posY + ySpace, fontSize, fontSize
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, fWindowWidth, fWindowHeight
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, r, g, b
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)
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val acc = chrVec :: acc
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in
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buildTextStringAfterCursor
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( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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end
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else
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(* return if no space horizontally or vertically *)
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accToDrawMsg (acc, cursorAcc)
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end
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else
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(* if we reached the end of the string,
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* call function to build next string *)
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continueBuildTextLineGapAfterCursor
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( tl, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, cursorAcc
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)
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and continueBuildTextLineGapAfterCursor
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( strList, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, cursorAcc
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) =
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case strList of
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hd :: tl =>
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buildTextStringAfterCursor
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( 0, hd, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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| [] => accToDrawMsg (acc, cursorAcc)
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(* same as buildTextStringAfterCursor, except this keeps track of absolute
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* index and cursor pos too *)
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fun buildTextStringBeforeCursor
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( pos, str, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx, cursorPos, hr, hg, hb
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) =
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if pos < String.size str then
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case String.sub (str, pos) of
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#" " =>
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buildTextStringBeforeCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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| #"\t" =>
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buildTextStringBeforeCursor
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( pos + 1, str, acc, posX + xSpace3, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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| #"\n" =>
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if posY + ySpace < windowHeight then
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buildTextStringBeforeCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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else
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accToDrawMsg (acc, [])
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| #"\r" =>
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if posY + ySpace < windowHeight then
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if
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pos < String.size str - 1
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andalso String.sub (str, pos + 1) = #"\n"
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then
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buildTextStringBeforeCursor
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( pos + 2, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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else
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buildTextStringBeforeCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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else
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accToDrawMsg (acc, [])
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| chr =>
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let
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val chrFun = Vector.sub (CozetteAscii.asciiTable, Char.ord chr)
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in
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if posX + xSpace < windowWidth then
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let
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val chrVec = chrFun
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(posX, posY, fontSize, fontSize, fWindowWidth, fWindowHeight, r, g, b)
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val acc = chrVec :: acc
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in
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buildTextStringBeforeCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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end
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else if posY + ySpace < windowHeight then
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let
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val chrVec = chrFun
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( startX, posY + ySpace, fontSize, fontSize
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, fWindowWidth, fWindowHeight
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, r, g, b
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)
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val acc = chrVec :: acc
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in
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buildTextStringBeforeCursor
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( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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end
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else
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accToDrawMsg (acc, [])
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end
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else
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continueBuildTextLineGapBeforeCursor
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( tl, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, absIdx, cursorPos, hr, hg, hb
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)
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and buildTextStringWithinCursor
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( pos, str, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx, cursorPos, cursorAcc, hr, hg, hb
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) =
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if pos < String.size str then
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case String.sub (str, pos) of
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#" " =>
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buildTextStringWithinCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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| #"\t" =>
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buildTextStringWithinCursor
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( pos + 1, str, acc, posX + xSpace3, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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| #"\n" =>
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if posY + ySpace < windowHeight then
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buildTextStringWithinCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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else
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accToDrawMsg (acc, cursorAcc)
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| #"\r" =>
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if posY + ySpace < windowHeight then
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if
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pos < String.size str - 1
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andalso String.sub (str, pos + 1) = #"\n"
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then
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buildTextStringWithinCursor
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( pos + 2, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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else
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buildTextStringWithinCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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else
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accToDrawMsg (acc, cursorAcc)
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| chr =>
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let
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val chrFun = Vector.sub (CozetteAscii.asciiTable, Char.ord chr)
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in
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if absIdx <> cursorPos then
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(* not equal to cursor *)
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if posX + xSpace < windowWidth then
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let
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val chrVec = chrFun
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(posX, posY, fontSize, fontSize, fWindowWidth, fWindowHeight, r, g, b)
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val acc = chrVec :: acc
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in
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buildTextStringWithinCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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end
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else if posY + ySpace < windowHeight then
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let
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val chrVec = chrFun
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( startX, posY + ySpace, fontSize, fontSize
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, fWindowWidth, fWindowHeight
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, r, g, b
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)
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val acc = chrVec :: acc
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in
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buildTextStringWithinCursor
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( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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end
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else
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accToDrawMsg (acc, cursorAcc)
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else
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(* equal to cursor *)
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let
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val cursorAcc = buildCursor (posX, posY, fWindowWidth, fWindowHeight, r, g ,b)
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in
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if posX + xSpace < windowWidth then
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let
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val chrVec = chrFun
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( posX, posY, fontSize, fontSize
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, fWindowWidth, fWindowHeight
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, hr, hg, hb
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)
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val acc = chrVec :: acc
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in
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(* can start building after cursor now,
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* since cursor was built *)
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buildTextStringAfterCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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end
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else if posY + ySpace < windowHeight then
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let
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val chrVec = chrFun
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( startX, posY + ySpace, fontSize, fontSize
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, fWindowWidth, fWindowHeight
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, hr, hg, hb
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)
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val acc = chrVec :: acc
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in
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(* can start building after cursor now,
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* since cursor was built *)
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buildTextStringAfterCursor
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( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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end
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else
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accToDrawMsg (acc, cursorAcc)
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end
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end
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else
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(* we have built cursor now, so can call after-cursor function
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* to build rest of text *)
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continueBuildTextLineGapAfterCursor
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( tl, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, cursorAcc
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)
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and continueBuildTextLineGapBeforeCursor
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( strList, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, absIdx, cursorPos, hr, hg, hb
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) =
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case strList of
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hd :: tl =>
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if cursorPos >= absIdx + cursorPos then
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(* if end of string is before cursor *)
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buildTextStringBeforeCursor
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( 0, hd, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx, cursorPos, hr, hg, hb
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)
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else
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(* if within cursor *)
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buildTextStringWithinCursor
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( 0, hd, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx, cursorPos, [], hr, hg, hb
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)
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| [] => accToDrawMsg (acc, [])
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fun build
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(startLine, cursorPos, lineGap: LineGap.t, windowWidth, windowHeight) =
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let
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val lineGap = LineGap.goToLine (startLine, lineGap)
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val {rightStrings, rightLines, line = curLine, idx = curIdx, ...} = lineGap
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in
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case (rightStrings, rightLines) of
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(rStrHd :: rStrTl, rLnHd :: _) =>
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let
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(* get index of line to start building from *)
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val startIdx =
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if startLine > curLine then
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let
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val lnPos = startLine - curLine - 1
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val startIdx = Vector.sub (rLnHd, lnPos)
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in
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if
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String.sub (rStrHd, startIdx) = #"\r"
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andalso startIdx < String.size rStrHd - 1
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andalso String.sub (rStrHd, startIdx + 1) = #"\n"
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then
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(* handle \r\n pair *)
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startIdx + 2
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else startIdx + 1
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end
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else
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0
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val absIdx = curIdx + startIdx
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in
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if cursorPos < curIdx + String.size rStrHd then
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(* if cursor is within string *)
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buildTextStringWithinCursor
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( startIdx, rStrHd, []
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, 5, 5, 5
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, windowWidth, windowHeight
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, Real32.fromInt windowWidth, Real32.fromInt windowHeight
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, 0.67, 0.51, 0.83
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, rStrTl, absIdx, cursorPos, []
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, 0.211, 0.219, 0.25
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)
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else
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(* if cursor is after string *)
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buildTextStringBeforeCursor
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( startIdx, rStrHd, []
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, 5, 5, 5
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, windowWidth, windowHeight
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, Real32.fromInt windowWidth, Real32.fromInt windowHeight
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, 0.67, 0.51, 0.83
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, rStrTl, absIdx, cursorPos
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, 0.211, 0.219, 0.25
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)
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end
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| (_, _) =>
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(* requested line goes beyond the buffer,
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* so just return empty list as there is nothig
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* else we can do. *)
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[]
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end
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end
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