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-- primitives for editing text
Text = {}
local utf8 = require 'utf8'
local Debug_new_render = false
-- return values:
-- y coordinate drawn until in px
-- position of start of final screen line drawn
function Text.draw(line, line_width, line_index)
love.graphics.setColor(0,0,0)
-- wrap long lines
local x = 25
local y = line.y
local pos = 1
local screen_line_starting_pos = 1
if line.fragments == nil then
Text.compute_fragments(line, line_width)
end
line.screen_line_starting_pos = nil -- TODO: avoid recomputing on every repaint
if Debug_new_render then print('--') end
for _, f in ipairs(line.fragments) do
local frag, frag_text = f.data, f.text
-- render fragment
local frag_width = math.floor(frag_text:getWidth()*Zoom)
if x + frag_width > line_width then
assert(x > 25) -- no overfull lines
if line_index > Screen_top1.line or pos > Screen_top1.pos then
y = y + math.floor(15*Zoom)
if y + math.floor(15*Zoom) > Screen_height then
return y, screen_line_starting_pos
end
screen_line_starting_pos = pos
if Debug_new_render then print('y', y) end
end
x = 25
if line.screen_line_starting_pos == nil then
line.screen_line_starting_pos = {1, pos}
else
table.insert(line.screen_line_starting_pos, pos)
end
end
if Debug_new_render then print('checking to draw', pos, Screen_top1.pos) end
if line_index > Screen_top1.line or pos >= Screen_top1.pos then
if Debug_new_render then print('drawing '..frag) end
love.graphics.draw(frag_text, x,y, 0, Zoom)
end
-- render cursor if necessary
local frag_len = utf8.len(frag)
if line_index == Cursor1.line then
if pos <= Cursor1.pos and pos + frag_len > Cursor1.pos then
Text.draw_cursor(x+Text.cursor_x2(frag, Cursor1.pos-pos+1), y)
end
end
x = x + frag_width
pos = pos + frag_len
end
if line_index == Cursor1.line and Cursor1.pos == pos then
Text.draw_cursor(x, y)
end
Debug_new_render = false
return y, screen_line_starting_pos
end
-- manual tests:
-- draw with small line_width of 100
-- short words break on spaces
-- long words break when they must
function Text.draw_cursor(x, y)
love.graphics.setColor(1,0,0)
love.graphics.circle('fill', x,y+math.floor(15*Zoom), 2)
love.graphics.setColor(0,0,0)
Cursor_x = x
Cursor_y = y+math.floor(15*Zoom)
end
function Text.compute_fragments(line, line_width)
line.fragments = {}
local x = 25
-- try to wrap at word boundaries
for frag in line.data:gmatch('%S*%s*') do
local frag_text = love.graphics.newText(love.graphics.getFont(), frag)
local frag_width = math.floor(frag_text:getWidth()*Zoom)
--? print('x: '..tostring(x)..'; '..tostring(line_width-x)..'px to go')
--? print('frag: ^'..frag..'$ is '..tostring(frag_width)..'px wide')
if x + frag_width > line_width then
while x + frag_width > line_width do
if x < 0.8*line_width then
-- long word; chop it at some letter
-- We're not going to reimplement TeX here.
local b = Text.nearest_cursor_pos(frag, line_width - x)
--? print('space for '..tostring(b)..' graphemes')
local frag1 = string.sub(frag, 1, b)
local frag1_text = love.graphics.newText(love.graphics.getFont(), frag1)
local frag1_width = math.floor(frag1_text:getWidth()*Zoom)
--? print('inserting '..frag1..' of width '..tostring(frag1_width)..'px')
table.insert(line.fragments, {data=frag1, text=frag1_text})
frag = string.sub(frag, b+1)
frag_text = love.graphics.newText(love.graphics.getFont(), frag)
frag_width = math.floor(frag_text:getWidth()*Zoom)
end
x = 25 -- new line
end
end
if #frag > 0 then
--? print('inserting '..frag..' of width '..tostring(frag_width)..'px')
table.insert(line.fragments, {data=frag, text=frag_text})
end
end
end
function Text.textinput(t)
if love.mouse.isDown('1') then return end
Text.insert_at_cursor(t)
end
function Text.insert_at_cursor(t)
local byte_offset
if Cursor1.pos > 1 then
byte_offset = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos-1)
else
byte_offset = 0
end
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_offset)..t..string.sub(Lines[Cursor1.line].data, byte_offset+1)
Lines[Cursor1.line].fragments = nil
Cursor1.pos = Cursor1.pos+1
end
-- Don't handle any keys here that would trigger love.textinput above.
function Text.keychord_pressed(chord)
--? Debug_new_render = true
if chord == 'return' then
local byte_offset = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos)
table.insert(Lines, Cursor1.line+1, {mode='text', data=string.sub(Lines[Cursor1.line].data, byte_offset)})
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_offset-1)
Lines[Cursor1.line].fragments = nil
Cursor1.line = Cursor1.line+1
Cursor1.pos = 1
save_to_disk(Lines, Filename)
elseif chord == 'tab' then
Text.insert_at_cursor('\t')
save_to_disk(Lines, Filename)
elseif chord == 'left' then
assert(Lines[Cursor1.line].mode == 'text')
if Cursor1.pos > 1 then
Cursor1.pos = Cursor1.pos-1
else
local new_cursor_line = Cursor1.line
while new_cursor_line > 1 do
new_cursor_line = new_cursor_line-1
if Lines[new_cursor_line].mode == 'text' then
Cursor1.line = new_cursor_line
Cursor1.pos = utf8.len(Lines[Cursor1.line].data) + 1
break
end
end
if Cursor1.line < Screen_top1.line then
Screen_top1.line = Cursor1.line
end
end
elseif chord == 'right' then
assert(Lines[Cursor1.line].mode == 'text')
if Cursor1.pos <= utf8.len(Lines[Cursor1.line].data) then
Cursor1.pos = Cursor1.pos+1
else
local new_cursor_line = Cursor1.line
while new_cursor_line <= #Lines-1 do
new_cursor_line = new_cursor_line+1
if Lines[new_cursor_line].mode == 'text' then
Cursor1.line = new_cursor_line
Cursor1.pos = 1
break
end
end
if Cursor1.line > Screen_bottom1.line then
Screen_top1.line = Cursor1.line
end
end
elseif chord == 'home' then
Cursor1.pos = 1
elseif chord == 'end' then
Cursor1.pos = utf8.len(Lines[Cursor1.line].data) + 1
elseif chord == 'backspace' then
if Cursor1.pos > 1 then
local byte_start = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos-1)
local byte_end = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos)
if byte_start then
if byte_end then
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_start-1)..string.sub(Lines[Cursor1.line].data, byte_end)
else
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_start-1)
end
Lines[Cursor1.line].fragments = nil
Cursor1.pos = Cursor1.pos-1
end
elseif Cursor1.line > 1 then
if Lines[Cursor1.line-1].mode == 'drawing' then
table.remove(Lines, Cursor1.line-1)
else
-- join lines
Cursor1.pos = utf8.len(Lines[Cursor1.line-1].data)+1
Lines[Cursor1.line-1].data = Lines[Cursor1.line-1].data..Lines[Cursor1.line].data
Lines[Cursor1.line-1].fragments = nil
table.remove(Lines, Cursor1.line)
end
Cursor1.line = Cursor1.line-1
end
save_to_disk(Lines, Filename)
elseif chord == 'delete' then
if Cursor1.pos <= utf8.len(Lines[Cursor1.line].data) then
local byte_start = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos)
local byte_end = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos+1)
if byte_start then
if byte_end then
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_start-1)..string.sub(Lines[Cursor1.line].data, byte_end)
else
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_start-1)
end
Lines[Cursor1.line].fragments = nil
-- no change to Cursor1.pos
end
elseif Cursor1.line < #Lines then
if Lines[Cursor1.line+1].mode == 'drawing' then
table.remove(Lines, Cursor1.line+1)
else
-- join lines
Lines[Cursor1.line].data = Lines[Cursor1.line].data..Lines[Cursor1.line+1].data
Lines[Cursor1.line].fragments = nil
table.remove(Lines, Cursor1.line+1)
end
end
save_to_disk(Lines, Filename)
elseif chord == 'up' then
assert(Lines[Cursor1.line].mode == 'text')
--? print('up', Cursor1.pos, Screen_top1.pos)
local screen_line_index,screen_line_starting_pos = Text.pos_at_start_of_cursor_screen_line()
if screen_line_starting_pos == 1 then
--? print('cursor is at first screen line of its line')
-- line is done; skip to previous text line
local new_cursor_line = Cursor1.line
while new_cursor_line > 1 do
new_cursor_line = new_cursor_line-1
if Lines[new_cursor_line].mode == 'text' then
Cursor1.line = new_cursor_line
if Lines[Cursor1.line].screen_line_starting_pos == nil then
Cursor1.pos = Text.nearest_cursor_pos(Lines[Cursor1.line].data, Cursor_x)
break
end
-- previous text line found, pick its final screen line
local screen_line_starting_pos = Lines[Cursor1.line].screen_line_starting_pos
screen_line_starting_pos = screen_line_starting_pos[#screen_line_starting_pos]
--? print('previous screen line starts at pos '..tostring(screen_line_starting_pos)..' of its line')
if Screen_top1.line == Cursor1.line and Screen_top1.pos == screen_line_starting_pos then
Screen_top1.pos = screen_line_starting_pos
--? print('pos of top of screen is also '..tostring(Screen_top1.pos)..' of the same line')
end
local s = string.sub(Lines[Cursor1.line].data, screen_line_starting_pos)
Cursor1.pos = screen_line_starting_pos + Text.nearest_cursor_pos(s, Cursor_x) - 1
break
end
end
if Cursor1.line < Screen_top1.line then
Screen_top1.line = Cursor1.line
end
else
-- move up one screen line in current line
--? print('cursor is NOT at first screen line of its line')
assert(screen_line_index > 1)
new_screen_line_starting_pos = Lines[Cursor1.line].screen_line_starting_pos[screen_line_index-1]
--? print('switching pos of screen line at cursor from '..tostring(screen_line_starting_pos)..' to '..tostring(new_screen_line_starting_pos))
if Screen_top1.line == Cursor1.line and Screen_top1.pos == screen_line_starting_pos then
Screen_top1.pos = new_screen_line_starting_pos
--? print('also setting pos of top of screen to '..tostring(Screen_top1.pos))
end
local s = string.sub(Lines[Cursor1.line].data, new_screen_line_starting_pos)
Cursor1.pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(s, Cursor_x) - 1
--? print('cursor pos is now '..tostring(Cursor1.pos))
end
elseif chord == 'down' then
assert(Lines[Cursor1.line].mode == 'text')
if Text.cursor_at_final_screen_line() then
-- line is done, skip to next text line
--? print('down: cursor at final screen line of its line')
local new_cursor_line = Cursor1.line
while new_cursor_line < #Lines do
new_cursor_line = new_cursor_line+1
if Lines[new_cursor_line].mode == 'text' then
Cursor1.line = new_cursor_line
Cursor1.pos = Text.nearest_cursor_pos(Lines[Cursor1.line].data, Cursor_x)
--? print(Cursor1.pos)
break
end
end
--? print(Cursor1.line, Cursor1.pos, Screen_bottom1.line)
if Cursor1.line > Screen_bottom1.line then
--? print('screen top before:', Screen_top1.line, Screen_top1.pos)
Screen_top1.line = Cursor1.line
--? print('scroll up preserving cursor')
Text.scroll_up_while_cursor_on_screen()
--? print('screen top after:', Screen_top1.line, Screen_top1.pos)
end
--? print('=>', Cursor1.line, Cursor1.pos, Screen_bottom1.line)
else
-- move down one screen line in current line
--? print('cursor is NOT at final screen line of its line')
local screen_line_index, screen_line_starting_pos = Text.pos_at_start_of_cursor_screen_line()
new_screen_line_starting_pos = Lines[Cursor1.line].screen_line_starting_pos[screen_line_index+1]
--? print('switching pos of screen line at cursor from '..tostring(screen_line_starting_pos)..' to '..tostring(new_screen_line_starting_pos))
local s = string.sub(Lines[Cursor1.line].data, new_screen_line_starting_pos)
Cursor1.pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(s, Cursor_x) - 1
--? print('cursor pos is now '..tostring(Cursor1.pos))
Screen_top1.line = Cursor1.line
--? print('scroll up preserving cursor')
Text.scroll_up_while_cursor_on_screen()
--? print('screen top after:', Screen_top1.line, Screen_top1.pos)
end
end
end
function Text.pos_at_start_of_cursor_screen_line()
if Lines[Cursor1.line].screen_line_starting_pos == nil then
return 1,1
end
for i=#Lines[Cursor1.line].screen_line_starting_pos,1,-1 do
local spos = Lines[Cursor1.line].screen_line_starting_pos[i]
if spos <= Cursor1.pos then
return i,spos
end
end
assert(false)
end
function Text.cursor_at_final_screen_line()
if Lines[Cursor1.line].screen_line_starting_pos == nil then
return true
end
i=#Lines[Cursor1.line].screen_line_starting_pos
local spos = Lines[Cursor1.line].screen_line_starting_pos[i]
return spos <= Cursor1.pos
end
function Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
while Cursor1.line <= #Lines do
if Lines[Cursor1.line].mode == 'text' then
break
end
Cursor1.line = Cursor1.line + 1
end
-- hack: insert a text line at bottom of file if necessary
if Cursor1.line > #Lines then
assert(Cursor1.line == #Lines+1)
table.insert(Lines, {mode='text', data=''})
end
if Cursor1.line > Screen_bottom1.line then
Screen_top1.line = Cursor1.line
Text.scroll_up_while_cursor_on_screen()
end
end
function Text.scroll_up_while_cursor_on_screen()
local cursor_pos_screen_lines = Text.pos_at_start_of_cursor_screen_line()
--? print('cursor pos '..tostring(Cursor1.pos)..' is on the #'..tostring(cursor_pos_screen_lines)..' screen line down')
local y = Screen_height - cursor_pos_screen_lines*math.floor(15*Zoom)
-- duplicate some logic from love.draw
while true do
if Screen_top1.line == 1 then break end
--? print('y', y)
local h = 0
if Lines[Screen_top1.line-1].mode == 'drawing' then
h = 20 + Drawing.pixels(Lines[Screen_top1.line-1].h)
elseif Lines[Screen_top1.line-1].screen_line_starting_pos == nil then
h = h + math.floor(15*Zoom) -- text height
else
local n = #Lines[Screen_top1.line-1].screen_line_starting_pos
h = h + n*math.floor(15*Zoom) -- text height
end
--? print('height:', h)
if y - h < 0 then
break
end
y = y - h
if y < math.floor(15*Zoom) then
break
end
Screen_top1.line = Screen_top1.line - 1
end
end
function Text.in_line(line, x,y)
if line.y == nil then return false end -- outside current page
if x < 16 then return false end
if y < line.y then return false end
if line.screen_line_starting_pos == nil then return y < line.y + math.floor(15*Zoom) end
return y < line.y + #line.screen_line_starting_pos * math.floor(15*Zoom)
end
function Text.move_cursor(line_index, line, mx, my)
Cursor1.line = line_index
if line.screen_line_starting_pos == nil then
Cursor1.pos = Text.nearest_cursor_pos(line.data, mx)
return
end
assert(line.fragments)
assert(my >= line.y)
-- duplicate some logic from Text.draw
local y = line.y
for screen_line_index,screen_line_starting_pos in ipairs(line.screen_line_starting_pos) do
local nexty = y + math.floor(15*Zoom)
if my < nexty then
-- On all wrapped screen lines but the final one, clicks past end of
-- line position cursor on final character of screen line.
-- (The final screen line positions past end of screen line as always.)
if mx > Line_width and screen_line_index < #line.screen_line_starting_pos then
Cursor1.pos = line.screen_line_starting_pos[screen_line_index+1]
return
end
local s = string.sub(line.data, screen_line_starting_pos)
Cursor1.pos = screen_line_starting_pos + Text.nearest_cursor_pos(s, mx) - 1
return
end
y = nexty
end
assert(false)
end
-- manual test:
-- line: abc
-- def
-- gh
-- fragments: abc, def, gh
-- click inside e
-- line_starting_pos = 1 + 3 = 4
-- nearest_cursor_pos('defgh', mx) = 2
-- Cursor1.pos = 4 + 2 - 1 = 5
-- manual test:
-- click inside h
-- line_starting_pos = 1 + 3 + 3 = 7
-- nearest_cursor_pos('gh', mx) = 2
-- Cursor1.pos = 7 + 2 - 1 = 8
function Text.nearest_cursor_pos(line, x)
if x == 0 then
return 1
end
local len = utf8.len(line)
local max_x = Text.cursor_x(line, len+1)
if x > max_x then
return len+1
end
local left, right = 1, len+1
--? print('--')
while true do
local curr = math.floor((left+right)/2)
local currxmin = Text.cursor_x(line, curr)
local currxmax = Text.cursor_x(line, curr+1)
--? print(x, left, right, curr, currxmin, currxmax)
if currxmin <= x and x < currxmax then
return curr
end
if left >= right-1 then
return right
end
if currxmin > x then
right = curr
else
left = curr
end
end
assert(false)
end
function Text.cursor_x(line_data, cursor_pos)
local line_before_cursor = line_data:sub(1, cursor_pos-1)
local text_before_cursor = love.graphics.newText(love.graphics.getFont(), line_before_cursor)
return 25 + math.floor(text_before_cursor:getWidth()*Zoom)
end
function Text.cursor_x2(s, cursor_pos)
local s_before_cursor = s:sub(1, cursor_pos-1)
local text_before_cursor = love.graphics.newText(love.graphics.getFont(), s_before_cursor)
return math.floor(text_before_cursor:getWidth()*Zoom)
end
function Text.to2(pos1)
local result = {line=pos1.line, screen_line=1}
if Line[pos1.line].screen_line_starting_pos == nil then
result.screen_pos = pos1.pos
else
for i=#Lines[pos1.line].screen_line_starting_pos,1,-1 do
local spos = Lines[pos1.line].screen_line_starting_pos[i]
if spos <= Cursor1.pos then
result.screen_line = i
result.screen_pos = spos
break
end
end
end
assert(result.screen_pos)
return result
end
function Text.to1(pos2)
local result = {line=pos2.line, pos=pos2.screen_pos}
if pos2.screen_line > 1 then
result.pos = Lines[pos2.line].screen_line_starting_pos[pos2.screen_line] + pos2.screen_pos
end
return result
end
return Text
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