in start of cursor.sml's viK function, use vi0 function if cursor is at newline, so there's no need to worry about or track column
This commit is contained in:
327
fcore/cursor.sml
327
fcore/cursor.sml
@@ -1,5 +1,151 @@
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structure Cursor =
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struct
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fun helpVi0String (strPos, str, absIdx, strTl, lineTl) =
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if strPos < 0 then
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helpVi0List (strTl, lineTl, absIdx)
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else
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case String.sub (str, strPos) of
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#"\n" =>
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absIdx + 1
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| _ =>
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helpVi0String (strPos - 1, str, absIdx - 1, strTl, lineTl)
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and helpVi0List (strings, lines, absIdx) =
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case (strings, lines) of
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(strHd::strTl, lineHd::lineTl) =>
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helpVi0String
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( String.size strHd - 1, strHd, absIdx
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, strTl, lineTl
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)
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| (_, _) =>
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(* this case means strings and lines are empty
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* and empty means we are at first line
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* so we can return 0 *)
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0
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fun vi0 (lineGap: LineGap.t, cursorIdx) =
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let
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val
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{rightStrings, idx = bufferIdx, rightLines, leftStrings, leftLines, ...} =
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lineGap
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in
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case (rightStrings, rightLines) of
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(strHd :: strTl, lnHd :: lnTl) =>
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let
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(* convert absolute cursorIdx to idx relative to hd string *)
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val strIdx = cursorIdx - bufferIdx
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in
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if strIdx < String.size strHd then
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(* strIdx is in this string *)
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if String.sub (strHd, strIdx) = #"\n" then
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(* don't need to do anything if we are already at newline;
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* just return current cursorIdx *)
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cursorIdx
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else
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(* not at newline so start iterating *)
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helpVi0String
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( strIdx - 1, strHd, cursorIdx - 1
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, strTl, lnTl
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)
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else
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(* strIdx must be in the strTl *)
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(case (strTl, lnTl) of
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(nestStrHd :: _, nestLnHd :: _) =>
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let
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val strIdx = strIdx - String.size strHd
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in
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if String.sub (nestStrHd, strIdx) = #"\n" then
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(* already at linebreak so return same cursorIdx *)
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cursorIdx
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else
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(* not in linebreak *)
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helpVi0String
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( strIdx - 1, nestStrHd, cursorIdx - 1
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, strHd :: leftStrings, lnHd :: leftLines
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)
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end
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| (_, _) => cursorIdx)
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end
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| (_, _) =>
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(* nowhere to go, so return cursorIdx *)
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cursorIdx
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end
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fun helpViDlrString (strPos, str, absIdx, strTl, lineTl) =
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if strPos = String.size str then
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helpViDlrList (strTl, lineTl, absIdx)
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else
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case String.sub (str, strPos) of
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#"\n" =>
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absIdx - 1
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| _ =>
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helpViDlrString (strPos + 1, str, absIdx + 1, strTl, lineTl)
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and helpViDlrList (strings, lines, absIdx) =
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case (strings, lines) of
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(strHd::strTl, lineHd::lineTl) =>
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helpViDlrString
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(0, strHd, absIdx , strTl, lineTl)
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| (_, _) =>
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(* this case means strings and lines are empty
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* and empty means we have reached end of lineGap
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* so we can return last chr *)
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absIdx - 1
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fun viDlr(lineGap: LineGap.t, cursorIdx) =
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let
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val
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{rightStrings, idx = bufferIdx, rightLines, leftStrings, leftLines, ...} =
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lineGap
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in
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case (rightStrings, rightLines) of
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(strHd :: strTl, lnHd :: lnTl) =>
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let
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(* convert absolute cursorIdx to idx relative to hd string *)
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val strIdx = cursorIdx - bufferIdx
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in
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if strIdx < String.size strHd then
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if String.sub (strHd, strIdx) <> #"\n" then
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(* not in double linebreak *)
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helpViDlrString
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(strIdx + 1, strHd, cursorIdx + 1, strTl, lnTl)
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else
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(* check if we are in double linebreak *)
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if strIdx - 1 >= 0 then
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if String.sub (strHd, strIdx - 1) = #"\n" then
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(* we are in double linebreak, so do nothing *)
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cursorIdx
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else
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(* not in double linebreak, so iterate *)
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helpViDlrString
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(strIdx + 1, strHd, cursorIdx + 1 , strTl, lnTl)
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else
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(* check if double linebreak in strTl *)
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(case strTl of
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nestStrHd :: _ =>
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if String.sub (nestStrHd, 0) = #"\n" then
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cursorIdx
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else
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helpViDlrString
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(strIdx + 1, strHd, cursorIdx + 1, strTl, lnTl)
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| [] => cursorIdx)
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else
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(* strIdx must be in the strTl *)
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(case (strTl, lnTl) of
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(nestStrHd :: nestStrTl, nestLnHd :: nestLnTl) =>
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let
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val strIdx = strIdx - String.size strHd
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in
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helpViDlrString
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(strIdx + 1, nestStrHd, cursorIdx + 1, nestStrTl, nestLnTl)
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end
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| (_, _) => cursorIdx)
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end
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| (_, _) =>
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(* nowhere to go, so return cursorIdx *)
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cursorIdx
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end
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(* Prerequisite: lineGap is moved to requested idx first
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* todo: check if we are in a \r\n pair, but this is not a priority *)
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fun viL (lineGap: LineGap.t, cursorIdx) =
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@@ -484,7 +630,7 @@ struct
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absIdx
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else
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(* not in double linebreak *)
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absIdx - 1
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absIdx - 1
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else
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(* check for double linebreak in tl *)
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(case strTl of
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@@ -592,15 +738,30 @@ struct
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if strIdx < String.size strHd then
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(* strIdx is in this string *)
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if String.sub (strHd, strIdx) = #"\n" then
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(* if we are at a newline
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* note:
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* don't need to check if we are a double linebreak,
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* because cursor navigation functions already check
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* for that condition at the end.
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* So there is no way at the start of a navigation function
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* that cursor is in a double linebreak incorrectly. *)
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helpViKString
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(strIdx - 1, strHd, cursorIdx - 1, 0, 0, true, strTl, lnHd, lnTl)
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(* if we are at a newline *)
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if strIdx > 0 then
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if String.sub (strHd, strIdx - 1) = #"\n" then
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(* if in double linebreak *)
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helpVi0String
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(strIdx - 2, strHd, cursorIdx - 2, strTl, lnTl)
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else
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(* not in double linebreak *)
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helpVi0String
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(strIdx - 1, strHd, cursorIdx - 1, strTl, lnTl)
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else
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(* check leftStrings to see if we are in a double linebreak *)
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(case (leftStrings, leftLines) of
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(lStrHd :: lStrTl, lLnHd :: lLnTl) =>
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if String.sub (lStrHd, String.size lStrHd - 1) = #"\n" then
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(* in double linebreak *)
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helpVi0String
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(String.size lStrHd - 2, lStrHd, cursorIdx - 2, lStrTl, lLnTl)
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else
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helpVi0String
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(strIdx - 1, strHd, cursorIdx - 1, strTl, lnTl)
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| (_, _) =>
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helpViKString
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(strIdx - 1, strHd, cursorIdx - 1, 0, 0, true, strTl, lnHd, lnTl))
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else
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(* not at newline
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* so get column number and start iterating *)
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@@ -646,150 +807,4 @@ struct
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(* nowhere to go rightward, so return cursorIdx *)
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cursorIdx
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end
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fun helpVi0String (strPos, str, absIdx, strTl, lineTl) =
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if strPos < 0 then
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helpVi0List (strTl, lineTl, absIdx)
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else
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case String.sub (str, strPos) of
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#"\n" =>
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absIdx + 1
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| _ =>
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helpVi0String (strPos - 1, str, absIdx - 1, strTl, lineTl)
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and helpVi0List (strings, lines, absIdx) =
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case (strings, lines) of
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(strHd::strTl, lineHd::lineTl) =>
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helpVi0String
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( String.size strHd - 1, strHd, absIdx
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, strTl, lineTl
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)
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| (_, _) =>
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(* this case means strings and lines are empty
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* and empty means we are at first line
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* so we can return 0 *)
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0
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fun vi0 (lineGap: LineGap.t, cursorIdx) =
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let
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val
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{rightStrings, idx = bufferIdx, rightLines, leftStrings, leftLines, ...} =
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lineGap
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in
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case (rightStrings, rightLines) of
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(strHd :: strTl, lnHd :: lnTl) =>
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let
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(* convert absolute cursorIdx to idx relative to hd string *)
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val strIdx = cursorIdx - bufferIdx
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in
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if strIdx < String.size strHd then
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(* strIdx is in this string *)
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if String.sub (strHd, strIdx) = #"\n" then
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(* don't need to do anything if we are already at newline;
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* just return current cursorIdx *)
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cursorIdx
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else
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(* not at newline so start iterating *)
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helpVi0String
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( strIdx - 1, strHd, cursorIdx - 1
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, strTl, lnTl
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)
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else
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(* strIdx must be in the strTl *)
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(case (strTl, lnTl) of
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(nestStrHd :: _, nestLnHd :: _) =>
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let
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val strIdx = strIdx - String.size strHd
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in
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if String.sub (nestStrHd, strIdx) = #"\n" then
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(* already at linebreak so return same cursorIdx *)
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cursorIdx
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else
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(* not in linebreak *)
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helpVi0String
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( strIdx - 1, nestStrHd, cursorIdx - 1
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, strHd :: leftStrings, lnHd :: leftLines
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)
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end
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| (_, _) => cursorIdx)
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end
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| (_, _) =>
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(* nowhere to go, so return cursorIdx *)
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cursorIdx
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end
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fun helpViDlrString (strPos, str, absIdx, strTl, lineTl) =
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if strPos = String.size str then
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helpViDlrList (strTl, lineTl, absIdx)
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else
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case String.sub (str, strPos) of
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#"\n" =>
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absIdx - 1
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| _ =>
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helpViDlrString (strPos + 1, str, absIdx + 1, strTl, lineTl)
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and helpViDlrList (strings, lines, absIdx) =
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case (strings, lines) of
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(strHd::strTl, lineHd::lineTl) =>
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helpViDlrString
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(0, strHd, absIdx , strTl, lineTl)
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| (_, _) =>
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(* this case means strings and lines are empty
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* and empty means we have reached end of lineGap
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* so we can return last chr *)
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absIdx - 1
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fun viDlr(lineGap: LineGap.t, cursorIdx) =
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let
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val
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{rightStrings, idx = bufferIdx, rightLines, leftStrings, leftLines, ...} =
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lineGap
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in
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case (rightStrings, rightLines) of
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(strHd :: strTl, lnHd :: lnTl) =>
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let
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(* convert absolute cursorIdx to idx relative to hd string *)
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val strIdx = cursorIdx - bufferIdx
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in
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if strIdx < String.size strHd then
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if String.sub (strHd, strIdx) <> #"\n" then
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(* not in double linebreak *)
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helpViDlrString
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(strIdx + 1, strHd, cursorIdx + 1, strTl, lnTl)
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else
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(* check if we are in double linebreak *)
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if strIdx - 1 >= 0 then
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if String.sub (strHd, strIdx - 1) = #"\n" then
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(* we are in double linebreak, so do nothing *)
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cursorIdx
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else
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(* not in double linebreak, so iterate *)
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helpViDlrString
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(strIdx + 1, strHd, cursorIdx + 1 , strTl, lnTl)
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else
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(* check if double linebreak in strTl *)
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(case strTl of
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nestStrHd :: _ =>
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if String.sub (nestStrHd, 0) = #"\n" then
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cursorIdx
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else
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helpViDlrString
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(strIdx + 1, strHd, cursorIdx + 1, strTl, lnTl)
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| [] => cursorIdx)
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else
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(* strIdx must be in the strTl *)
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(case (strTl, lnTl) of
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(nestStrHd :: nestStrTl, nestLnHd :: nestLnTl) =>
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let
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val strIdx = strIdx - String.size strHd
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in
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helpViDlrString
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(strIdx + 1, nestStrHd, cursorIdx + 1, nestStrTl, nestLnTl)
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end
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| (_, _) => cursorIdx)
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end
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| (_, _) =>
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(* nowhere to go, so return cursorIdx *)
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cursorIdx
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end
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end
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Reference in New Issue
Block a user