184 lines
6.9 KiB
Lua
184 lines
6.9 KiB
Lua
-- helpers for selecting portions of text
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-- Return any intersection of the region from Editor_state.selection1 to Editor_state.cursor1 (or
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-- current mouse, if mouse is pressed; or recent mouse if mouse is pressed and
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-- currently over a drawing) with the region between {line=line_index, pos=apos}
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-- and {line=line_index, pos=bpos}.
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-- apos must be less than bpos. However Editor_state.selection1 and Editor_state.cursor1 can be in any order.
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-- Result: positions spos,epos between apos,bpos.
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function Text.clip_selection(line_index, apos, bpos, left, right)
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if Editor_state.selection1.line == nil then return nil,nil end
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-- min,max = sorted(Editor_state.selection1,Editor_state.cursor1)
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local minl,minp = Editor_state.selection1.line,Editor_state.selection1.pos
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local maxl,maxp
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if App.mouse_down(1) then
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maxl,maxp = Text.mouse_pos(left, right)
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else
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maxl,maxp = Editor_state.cursor1.line,Editor_state.cursor1.pos
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end
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if minl > maxl then
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minl,maxl = maxl,minl
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minp,maxp = maxp,minp
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elseif minl == maxl then
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if minp > maxp then
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minp,maxp = maxp,minp
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end
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end
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-- check if intervals are disjoint
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if line_index < minl then return nil,nil end
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if line_index > maxl then return nil,nil end
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if line_index == minl and bpos <= minp then return nil,nil end
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if line_index == maxl and apos >= maxp then return nil,nil end
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-- compare bounds more carefully (start inclusive, end exclusive)
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local a_ge = Text.le1({line=minl, pos=minp}, {line=line_index, pos=apos})
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local b_lt = Text.lt1({line=line_index, pos=bpos}, {line=maxl, pos=maxp})
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--? print(minl,line_index,maxl, '--', minp,apos,bpos,maxp, '--', a_ge,b_lt)
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if a_ge and b_lt then
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-- fully contained
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return apos,bpos
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elseif a_ge then
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assert(maxl == line_index)
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return apos,maxp
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elseif b_lt then
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assert(minl == line_index)
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return minp,bpos
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else
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assert(minl == maxl and minl == line_index)
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return minp,maxp
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end
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end
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-- draw highlight for line corresponding to (lo,hi) given an approximate x,y and pos on the same screen line
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-- Creates text objects every time, so use this sparingly.
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-- Returns some intermediate computation useful elsewhere.
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function Text.draw_highlight(line, x,y, pos, lo,hi)
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if lo then
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local lo_offset = Text.offset(line.data, lo)
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local hi_offset = Text.offset(line.data, hi)
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local pos_offset = Text.offset(line.data, pos)
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local lo_px
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if pos == lo then
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lo_px = 0
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else
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local before = line.data:sub(pos_offset, lo_offset-1)
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local before_text = App.newText(love.graphics.getFont(), before)
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lo_px = App.width(before_text)
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end
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--? print(lo,pos,hi, '--', lo_offset,pos_offset,hi_offset, '--', lo_px)
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local s = line.data:sub(lo_offset, hi_offset-1)
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local text = App.newText(love.graphics.getFont(), s)
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local text_width = App.width(text)
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App.color(Highlight_color)
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love.graphics.rectangle('fill', x+lo_px,y, text_width,Editor_state.line_height)
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App.color(Text_color)
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return lo_px
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end
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end
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-- inefficient for some reason, so don't do it on every frame
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function Text.mouse_pos(left, right)
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local time = love.timer.getTime()
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if Editor_state.recent_mouse.time and Editor_state.recent_mouse.time > time-0.1 then
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return Editor_state.recent_mouse.line, Editor_state.recent_mouse.pos
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end
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Editor_state.recent_mouse.time = time
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local line,pos = Text.to_pos(App.mouse_x(), App.mouse_y(), left, right)
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if line then
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Editor_state.recent_mouse.line = line
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Editor_state.recent_mouse.pos = pos
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end
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return Editor_state.recent_mouse.line, Editor_state.recent_mouse.pos
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end
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function Text.to_pos(x,y, left, right)
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for line_index,line in ipairs(Editor_state.lines) do
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if line.mode == 'text' then
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if Text.in_line(line, x,y, left, right) then
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return line_index, Text.to_pos_on_line(line, x,y, left, right)
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end
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end
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end
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end
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function Text.cut_selection(left, right)
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if Editor_state.selection1.line == nil then return end
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local result = Text.selection()
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Text.delete_selection(left, right)
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return result
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end
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function Text.delete_selection(left, right)
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if Editor_state.selection1.line == nil then return end
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local minl,maxl = minmax(Editor_state.selection1.line, Editor_state.cursor1.line)
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local before = snapshot(minl, maxl)
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Text.delete_selection_without_undo(left, right)
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record_undo_event({before=before, after=snapshot(Editor_state.cursor1.line)})
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end
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function Text.delete_selection_without_undo(left, right)
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if Editor_state.selection1.line == nil then return end
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-- min,max = sorted(Editor_state.selection1,Editor_state.cursor1)
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local minl,minp = Editor_state.selection1.line,Editor_state.selection1.pos
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local maxl,maxp = Editor_state.cursor1.line,Editor_state.cursor1.pos
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if minl > maxl then
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minl,maxl = maxl,minl
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minp,maxp = maxp,minp
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elseif minl == maxl then
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if minp > maxp then
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minp,maxp = maxp,minp
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end
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end
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-- update Editor_state.cursor1 and Editor_state.selection1
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Editor_state.cursor1.line = minl
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Editor_state.cursor1.pos = minp
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if Text.lt1(Editor_state.cursor1, Editor_state.screen_top1) then
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Editor_state.screen_top1.line = Editor_state.cursor1.line
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_,Editor_state.screen_top1.pos = Text.pos_at_start_of_cursor_screen_line(left, right)
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end
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Editor_state.selection1 = {}
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-- delete everything between min (inclusive) and max (exclusive)
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Text.clear_cache(Editor_state.lines[minl])
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local min_offset = Text.offset(Editor_state.lines[minl].data, minp)
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local max_offset = Text.offset(Editor_state.lines[maxl].data, maxp)
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if minl == maxl then
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--? print('minl == maxl')
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Editor_state.lines[minl].data = Editor_state.lines[minl].data:sub(1, min_offset-1)..Editor_state.lines[minl].data:sub(max_offset)
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return
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end
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assert(minl < maxl)
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local rhs = Editor_state.lines[maxl].data:sub(max_offset)
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for i=maxl,minl+1,-1 do
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table.remove(Editor_state.lines, i)
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end
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Editor_state.lines[minl].data = Editor_state.lines[minl].data:sub(1, min_offset-1)..rhs
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end
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function Text.selection()
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if Editor_state.selection1.line == nil then return end
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-- min,max = sorted(Editor_state.selection1,Editor_state.cursor1)
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local minl,minp = Editor_state.selection1.line,Editor_state.selection1.pos
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local maxl,maxp = Editor_state.cursor1.line,Editor_state.cursor1.pos
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if minl > maxl then
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minl,maxl = maxl,minl
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minp,maxp = maxp,minp
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elseif minl == maxl then
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if minp > maxp then
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minp,maxp = maxp,minp
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end
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end
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local min_offset = Text.offset(Editor_state.lines[minl].data, minp)
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local max_offset = Text.offset(Editor_state.lines[maxl].data, maxp)
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if minl == maxl then
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return Editor_state.lines[minl].data:sub(min_offset, max_offset-1)
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end
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assert(minl < maxl)
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local result = {Editor_state.lines[minl].data:sub(min_offset)}
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for i=minl+1,maxl-1 do
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if Editor_state.lines[i].mode == 'text' then
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table.insert(result, Editor_state.lines[i].data)
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end
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end
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table.insert(result, Editor_state.lines[maxl].data:sub(1, max_offset-1))
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return table.concat(result, '\n')
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end
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