1018 lines
38 KiB
Lua
1018 lines
38 KiB
Lua
-- text editor, particularly text drawing, horizontal wrap, vertical scrolling
|
|
Text = {}
|
|
|
|
require 'search'
|
|
require 'select'
|
|
require 'undo'
|
|
require 'text_tests'
|
|
|
|
-- draw a line starting from startpos to screen at y between State.left and State.right
|
|
-- return y for the next line
|
|
function Text.draw(State, line_index, y, startpos, fg, hide_cursor)
|
|
--? print('text.draw', line_index, y)
|
|
local line = State.lines[line_index]
|
|
local line_cache = State.line_cache[line_index]
|
|
line_cache.startpos = startpos
|
|
-- wrap long lines
|
|
Text.populate_screen_line_starting_pos(State, line_index)
|
|
assert(#line_cache.screen_line_starting_pos >= 1, 'line cache missing screen line info')
|
|
for i=1,#line_cache.screen_line_starting_pos do
|
|
local pos = line_cache.screen_line_starting_pos[i]
|
|
if pos < startpos then
|
|
-- render nothing
|
|
else
|
|
local screen_line = Text.screen_line(line, line_cache, i)
|
|
--? print('text.draw:', screen_line, 'at', line_index,pos, 'after', x,y)
|
|
local frag_len = utf8.len(screen_line)
|
|
-- render any highlights
|
|
if State.selection1.line then
|
|
local lo, hi = Text.clip_selection(State, line_index, pos, pos+frag_len)
|
|
Text.draw_highlight(State, line, State.left,y, pos, lo,hi)
|
|
end
|
|
if line_index == State.cursor1.line then
|
|
-- render search highlight or cursor
|
|
if State.search_term then
|
|
local data = State.lines[State.cursor1.line].data
|
|
local cursor_offset = Text.offset(data, State.cursor1.pos)
|
|
if data:sub(cursor_offset, cursor_offset+#State.search_term-1) == State.search_term then
|
|
local save_selection = State.selection1
|
|
State.selection1 = {line=line_index, pos=State.cursor1.pos+utf8.len(State.search_term)}
|
|
local lo, hi = Text.clip_selection(State, line_index, pos, pos+frag_len)
|
|
Text.draw_highlight(State, line, State.left,y, pos, lo,hi)
|
|
State.selection1 = save_selection
|
|
end
|
|
else
|
|
if pos <= State.cursor1.pos and pos + frag_len > State.cursor1.pos then
|
|
if hide_cursor then
|
|
Text.pretend_draw_cursor(State, State.left+Text.x(State.font, screen_line, State.cursor1.pos-pos+1), y)
|
|
else
|
|
Text.draw_cursor(State, State.left+Text.x(State.font, screen_line, State.cursor1.pos-pos+1), y, Cursor_color)
|
|
end
|
|
elseif pos + frag_len == State.cursor1.pos then
|
|
-- Show cursor at end of line.
|
|
-- This place also catches end of wrapping screen lines. That doesn't seem worth distinguishing.
|
|
-- It seems useful to see a cursor whether your eye is on the left or right margin.
|
|
if hide_cursor then
|
|
Text.pretend_draw_cursor(State, State.left+Text.x(State.font, screen_line, State.cursor1.pos-pos+1), y)
|
|
else
|
|
Text.draw_cursor(State, State.left+Text.x(State.font, screen_line, State.cursor1.pos-pos+1), y, Cursor_color)
|
|
end
|
|
end
|
|
end
|
|
end
|
|
-- render fragment
|
|
App.color(fg or Text_color)
|
|
App.screen.print(screen_line, State.left,y)
|
|
y = y + State.line_height
|
|
if y >= App.screen.height then
|
|
break
|
|
end
|
|
end
|
|
end
|
|
return y
|
|
end
|
|
|
|
function Text.screen_line(line, line_cache, i)
|
|
local pos = line_cache.screen_line_starting_pos[i]
|
|
local offset = Text.offset(line.data, pos)
|
|
if i >= #line_cache.screen_line_starting_pos then
|
|
return line.data:sub(offset)
|
|
end
|
|
local endpos = line_cache.screen_line_starting_pos[i+1]-1
|
|
local end_offset = Text.offset(line.data, endpos)
|
|
return line.data:sub(offset, end_offset)
|
|
end
|
|
|
|
function Text.draw_cursor(State, x, y, cursor_color)
|
|
-- blink every 0.5s
|
|
if math.floor(Cursor_time*2)%2 == 0 then
|
|
App.color(cursor_color)
|
|
love.graphics.rectangle('fill', x,y, 3,State.line_height)
|
|
end
|
|
State.cursor_x = x
|
|
State.cursor_y = y+State.line_height
|
|
end
|
|
|
|
function Text.pretend_draw_cursor(State, x, y)
|
|
State.cursor_x = x
|
|
State.cursor_y = y+State.line_height
|
|
end
|
|
|
|
function Text.populate_screen_line_starting_pos(State, line_index)
|
|
local line = State.lines[line_index]
|
|
local line_cache = State.line_cache[line_index]
|
|
if line_cache == nil then
|
|
-- about to crash; dump some debug info
|
|
print(State.filename, line_index)
|
|
end
|
|
if line_cache.screen_line_starting_pos then
|
|
return
|
|
end
|
|
line_cache.screen_line_starting_pos = {1}
|
|
local x = 0
|
|
local pos = 1
|
|
-- try to wrap at word boundaries
|
|
for frag in line.data:gmatch('%S*%s*') do
|
|
local frag_width = State.font:getWidth(frag)
|
|
--? print('-- frag:', frag, pos, x, frag_width, State.width)
|
|
while x + frag_width > State.width do
|
|
--? print('frag:', frag, pos, x, frag_width, State.width)
|
|
if x < 0.8 * State.width then
|
|
-- long word; chop it at some letter
|
|
-- We're not going to reimplement TeX here.
|
|
local bpos = Text.nearest_pos_less_than(State.font, frag, State.width - x)
|
|
if x == 0 and bpos == 0 then
|
|
assert(false, ("Infinite loop while line-wrapping. Editor is %dpx wide; window is %dpx wide"):format(State.width, App.screen.width))
|
|
end
|
|
pos = pos + bpos
|
|
local boffset = Text.offset(frag, bpos+1) -- byte _after_ bpos
|
|
frag = string.sub(frag, boffset)
|
|
--? if bpos > 0 then
|
|
--? print('after chop:', frag)
|
|
--? end
|
|
frag_width = State.font:getWidth(frag)
|
|
end
|
|
--? print('screen line:', pos)
|
|
table.insert(line_cache.screen_line_starting_pos, pos)
|
|
x = 0 -- new screen line
|
|
end
|
|
x = x + frag_width
|
|
pos = pos + utf8.len(frag)
|
|
end
|
|
end
|
|
|
|
function Text.text_input(State, t)
|
|
if App.mouse_down(1) then return end
|
|
if App.any_modifier_down() then
|
|
if App.key_down(t) then
|
|
-- The modifiers didn't change the key. Handle it in keychord_press.
|
|
return
|
|
else
|
|
-- Key mutated by the keyboard layout. Continue below.
|
|
end
|
|
end
|
|
local before = snapshot(State, State.cursor1.line)
|
|
--? print(State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos)
|
|
Text.insert_at_cursor(State, t)
|
|
if State.cursor_y > App.screen.height - State.line_height then
|
|
Text.populate_screen_line_starting_pos(State, State.cursor1.line)
|
|
Text.snap_cursor_to_bottom_of_screen(State, State.left, State.right)
|
|
end
|
|
record_undo_event(State, {before=before, after=snapshot(State, State.cursor1.line)})
|
|
end
|
|
|
|
function Text.insert_at_cursor(State, t)
|
|
local byte_offset = Text.offset(State.lines[State.cursor1.line].data, State.cursor1.pos)
|
|
State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_offset-1)..t..string.sub(State.lines[State.cursor1.line].data, byte_offset)
|
|
Text.clear_screen_line_cache(State, State.cursor1.line)
|
|
State.cursor1.pos = State.cursor1.pos+1
|
|
end
|
|
|
|
-- Don't handle any keys here that would trigger text_input above.
|
|
function Text.keychord_press(State, chord, readonly)
|
|
--? print('chord', chord, State.selection1.line, State.selection1.pos)
|
|
if not readonly then
|
|
--== shortcuts that mutate text
|
|
if chord == 'return' then
|
|
local before_line = State.cursor1.line
|
|
local before = snapshot(State, before_line)
|
|
Text.insert_return(State)
|
|
if State.cursor_y > App.screen.height - State.line_height then
|
|
Text.snap_cursor_to_bottom_of_screen(State, State.left, State.right)
|
|
end
|
|
record_undo_event(State, {before=before, after=snapshot(State, before_line, State.cursor1.line)})
|
|
schedule_save(State)
|
|
elseif chord == 'tab' then
|
|
local before = snapshot(State, State.cursor1.line)
|
|
--? print(State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos)
|
|
Text.insert_at_cursor(State, '\t')
|
|
if State.cursor_y > App.screen.height - State.line_height then
|
|
Text.populate_screen_line_starting_pos(State, State.cursor1.line)
|
|
Text.snap_cursor_to_bottom_of_screen(State, State.left, State.right)
|
|
--? print('=>', State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos)
|
|
end
|
|
record_undo_event(State, {before=before, after=snapshot(State, State.cursor1.line)})
|
|
schedule_save(State)
|
|
elseif chord == 'backspace' then
|
|
if State.selection1.line then
|
|
Text.delete_selection_and_record_undo_event(State)
|
|
schedule_save(State)
|
|
return
|
|
end
|
|
local before
|
|
if State.cursor1.pos > 1 then
|
|
before = snapshot(State, State.cursor1.line)
|
|
local byte_start = utf8.offset(State.lines[State.cursor1.line].data, State.cursor1.pos-1)
|
|
local byte_end = utf8.offset(State.lines[State.cursor1.line].data, State.cursor1.pos)
|
|
if byte_start then
|
|
if byte_end then
|
|
State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_start-1)..string.sub(State.lines[State.cursor1.line].data, byte_end)
|
|
else
|
|
State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_start-1)
|
|
end
|
|
State.cursor1.pos = State.cursor1.pos-1
|
|
end
|
|
elseif State.cursor1.line > 1 then
|
|
before = snapshot(State, State.cursor1.line-1, State.cursor1.line)
|
|
-- join lines
|
|
State.cursor1.pos = utf8.len(State.lines[State.cursor1.line-1].data)+1
|
|
State.lines[State.cursor1.line-1].data = State.lines[State.cursor1.line-1].data..State.lines[State.cursor1.line].data
|
|
table.remove(State.lines, State.cursor1.line)
|
|
table.remove(State.line_cache, State.cursor1.line)
|
|
State.cursor1.line = State.cursor1.line-1
|
|
end
|
|
if State.screen_top1.line > #State.lines then
|
|
Text.populate_screen_line_starting_pos(State, #State.lines)
|
|
local line_cache = State.line_cache[#State.line_cache]
|
|
State.screen_top1 = {line=#State.lines, pos=line_cache.screen_line_starting_pos[#line_cache.screen_line_starting_pos]}
|
|
elseif Text.lt1(State.cursor1, State.screen_top1) then
|
|
State.screen_top1 = {
|
|
line=State.cursor1.line,
|
|
pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
|
|
}
|
|
Text.redraw_all(State) -- if we're scrolling, reclaim all line caches to avoid memory leaks
|
|
end
|
|
Text.clear_screen_line_cache(State, State.cursor1.line)
|
|
assert(Text.le1(State.screen_top1, State.cursor1), ('screen_top (line=%d,pos=%d) is below cursor (line=%d,pos=%d)'):format(State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos))
|
|
record_undo_event(State, {before=before, after=snapshot(State, State.cursor1.line)})
|
|
schedule_save(State)
|
|
elseif chord == 'delete' then
|
|
if State.selection1.line then
|
|
Text.delete_selection_and_record_undo_event(State)
|
|
schedule_save(State)
|
|
return
|
|
end
|
|
local before
|
|
if State.cursor1.pos <= utf8.len(State.lines[State.cursor1.line].data) then
|
|
before = snapshot(State, State.cursor1.line)
|
|
else
|
|
before = snapshot(State, State.cursor1.line, State.cursor1.line+1)
|
|
end
|
|
if State.cursor1.pos <= utf8.len(State.lines[State.cursor1.line].data) then
|
|
local byte_start = utf8.offset(State.lines[State.cursor1.line].data, State.cursor1.pos)
|
|
local byte_end = utf8.offset(State.lines[State.cursor1.line].data, State.cursor1.pos+1)
|
|
if byte_start then
|
|
if byte_end then
|
|
State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_start-1)..string.sub(State.lines[State.cursor1.line].data, byte_end)
|
|
else
|
|
State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_start-1)
|
|
end
|
|
-- no change to State.cursor1.pos
|
|
end
|
|
elseif State.cursor1.line < #State.lines then
|
|
-- join lines
|
|
State.lines[State.cursor1.line].data = State.lines[State.cursor1.line].data..State.lines[State.cursor1.line+1].data
|
|
table.remove(State.lines, State.cursor1.line+1)
|
|
table.remove(State.line_cache, State.cursor1.line+1)
|
|
end
|
|
Text.clear_screen_line_cache(State, State.cursor1.line)
|
|
record_undo_event(State, {before=before, after=snapshot(State, State.cursor1.line)})
|
|
schedule_save(State)
|
|
end
|
|
end
|
|
--== shortcuts that move the cursor
|
|
if chord == 'left' then
|
|
Text.left(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'right' then
|
|
Text.right(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'S-left' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.left(State)
|
|
elseif chord == 'S-right' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.right(State)
|
|
elseif chord == 'C-left' then
|
|
Text.word_left(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'C-right' then
|
|
Text.word_right(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'C-S-left' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.word_left(State)
|
|
elseif chord == 'C-S-right' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.word_right(State)
|
|
elseif chord == 'home' then
|
|
Text.start_of_line(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'end' then
|
|
Text.end_of_line(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'S-home' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.start_of_line(State)
|
|
elseif chord == 'S-end' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.end_of_line(State)
|
|
elseif chord == 'up' then
|
|
Text.up(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'down' then
|
|
Text.down(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'S-up' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.up(State)
|
|
elseif chord == 'S-down' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.down(State)
|
|
elseif chord == 'pageup' then
|
|
Text.pageup(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'pagedown' then
|
|
Text.pagedown(State)
|
|
State.selection1 = {}
|
|
elseif chord == 'S-pageup' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.pageup(State)
|
|
elseif chord == 'S-pagedown' then
|
|
if State.selection1.line == nil then
|
|
State.selection1 = deepcopy(State.cursor1)
|
|
end
|
|
Text.pagedown(State)
|
|
end
|
|
end
|
|
|
|
function Text.insert_return(State)
|
|
local byte_offset = Text.offset(State.lines[State.cursor1.line].data, State.cursor1.pos)
|
|
table.insert(State.lines, State.cursor1.line+1, {data=string.sub(State.lines[State.cursor1.line].data, byte_offset)})
|
|
table.insert(State.line_cache, State.cursor1.line+1, {})
|
|
State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_offset-1)
|
|
Text.clear_screen_line_cache(State, State.cursor1.line)
|
|
State.cursor1 = {line=State.cursor1.line+1, pos=1}
|
|
end
|
|
|
|
function Text.pageup(State)
|
|
State.screen_top1 = Text.previous_screen_top1(State)
|
|
State.cursor1 = deepcopy(State.screen_top1)
|
|
Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary(State)
|
|
Text.redraw_all(State) -- if we're scrolling, reclaim all line caches to avoid memory leaks
|
|
end
|
|
|
|
-- return the top y coordinate of a given line_index,
|
|
-- or nil if no part of it is on screen
|
|
function Text.starty(State, line_index)
|
|
-- duplicate some logic from love.draw
|
|
-- does not modify State (except to populate line_cache)
|
|
if line_index < State.screen_top1.line then return end
|
|
local loc2 = Text.to2(State, State.screen_top1)
|
|
local y = State.top
|
|
while true do
|
|
if loc2.line == line_index then return y end
|
|
y = y + State.line_height
|
|
if y + State.line_height > App.screen.height then break end
|
|
local next_loc2 = Text.next_screen_line(State, loc2)
|
|
if Text.eq2(next_loc2, loc2) then break end -- end of file
|
|
loc2 = next_loc2
|
|
end
|
|
end
|
|
|
|
function Text.previous_screen_top1(State)
|
|
-- duplicate some logic from love.draw
|
|
-- does not modify State (except to populate line_cache)
|
|
local loc2 = Text.to2(State, State.screen_top1)
|
|
local y = App.screen.height - State.line_height
|
|
while y >= State.top do
|
|
if loc2.line == 1 and loc2.screen_line == 1 and loc2.screen_pos == 1 then break end
|
|
y = y - State.line_height
|
|
loc2 = Text.previous_screen_line(State, loc2)
|
|
end
|
|
return Text.to1(State, loc2)
|
|
end
|
|
|
|
function Text.pagedown(State)
|
|
State.screen_top1 = Text.screen_bottom1(State)
|
|
State.cursor1 = deepcopy(State.screen_top1)
|
|
Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary(State)
|
|
Text.redraw_all(State) -- if we're scrolling, reclaim all line caches to avoid memory leaks
|
|
end
|
|
|
|
-- return the location of the start of the bottom-most line on screen
|
|
function Text.screen_bottom1(State)
|
|
-- duplicate some logic from love.draw
|
|
-- does not modify State (except to populate line_cache)
|
|
local loc2 = Text.to2(State, State.screen_top1)
|
|
local y = State.top
|
|
while true do
|
|
y = y + State.line_height
|
|
if y + State.line_height > App.screen.height then break end
|
|
local next_loc2 = Text.next_screen_line(State, loc2)
|
|
if Text.eq2(next_loc2, loc2) then break end
|
|
loc2 = next_loc2
|
|
end
|
|
return Text.to1(State, loc2)
|
|
end
|
|
|
|
function Text.up(State)
|
|
--? print('up', State.cursor1.line, State.cursor1.pos, State.screen_top1.line, State.screen_top1.pos)
|
|
local screen_line_starting_pos, screen_line_index = Text.pos_at_start_of_screen_line(State, State.cursor1)
|
|
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
|
|
if State.cursor1.line > 1 then
|
|
local new_cursor_line = State.cursor1.line-1
|
|
--? print('found previous text line')
|
|
State.cursor1 = {line=new_cursor_line, pos=nil}
|
|
Text.populate_screen_line_starting_pos(State, State.cursor1.line)
|
|
-- previous text line found, pick its final screen line
|
|
--? print('has multiple screen lines')
|
|
local screen_line_starting_pos = State.line_cache[State.cursor1.line].screen_line_starting_pos
|
|
--? print(#screen_line_starting_pos)
|
|
screen_line_starting_pos = screen_line_starting_pos[#screen_line_starting_pos]
|
|
local screen_line_starting_byte_offset = Text.offset(State.lines[State.cursor1.line].data, screen_line_starting_pos)
|
|
local s = string.sub(State.lines[State.cursor1.line].data, screen_line_starting_byte_offset)
|
|
State.cursor1.pos = screen_line_starting_pos + Text.nearest_cursor_pos(State.font, s, State.cursor_x, State.left) - 1
|
|
end
|
|
else
|
|
-- move up one screen line in current line
|
|
assert(screen_line_index > 1, 'bumped up against top screen line in line')
|
|
local new_screen_line_starting_pos = State.line_cache[State.cursor1.line].screen_line_starting_pos[screen_line_index-1]
|
|
local new_screen_line_starting_byte_offset = Text.offset(State.lines[State.cursor1.line].data, new_screen_line_starting_pos)
|
|
local s = string.sub(State.lines[State.cursor1.line].data, new_screen_line_starting_byte_offset)
|
|
State.cursor1.pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(State.font, s, State.cursor_x, State.left) - 1
|
|
--? print('cursor pos is now '..tostring(State.cursor1.pos))
|
|
end
|
|
if Text.lt1(State.cursor1, State.screen_top1) then
|
|
State.screen_top1 = {
|
|
line=State.cursor1.line,
|
|
pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
|
|
}
|
|
Text.redraw_all(State) -- if we're scrolling, reclaim all line caches to avoid memory leaks
|
|
end
|
|
end
|
|
|
|
function Text.down(State)
|
|
--? print('down', State.cursor1.line, State.cursor1.pos, State.screen_top1.line, State.screen_top1.pos)
|
|
assert(State.cursor1.pos, 'cursor has no pos')
|
|
if Text.cursor_at_final_screen_line(State) then
|
|
-- line is done, skip to next text line
|
|
--? print('cursor at final screen line of its line')
|
|
if State.cursor1.line < #State.lines then
|
|
local new_cursor_line = State.cursor1.line+1
|
|
State.cursor1.line = new_cursor_line
|
|
State.cursor1.pos = Text.nearest_cursor_pos(State.font, State.lines[State.cursor1.line].data, State.cursor_x, State.left)
|
|
--? print(State.cursor1.pos)
|
|
end
|
|
local screen_bottom1 = Text.screen_bottom1(State)
|
|
--? print('down 2', State.cursor1.line, State.cursor1.pos, State.screen_top1.line, State.screen_top1.pos, screen_bottom1.line, screen_bottom1.pos)
|
|
if State.cursor1.line > screen_bottom1.line then
|
|
--? print('screen top before:', State.screen_top1.line, State.screen_top1.pos)
|
|
--? print('scroll up preserving cursor')
|
|
Text.snap_cursor_to_bottom_of_screen(State)
|
|
--? print('screen top after:', State.screen_top1.line, State.screen_top1.pos)
|
|
end
|
|
else
|
|
-- move down one screen line in current line
|
|
local screen_bottom1 = Text.screen_bottom1(State)
|
|
local scroll_down = Text.le1(screen_bottom1, State.cursor1)
|
|
--? print('cursor is NOT at final screen line of its line')
|
|
local screen_line_starting_pos, screen_line_index = Text.pos_at_start_of_screen_line(State, State.cursor1)
|
|
Text.populate_screen_line_starting_pos(State, State.cursor1.line)
|
|
local new_screen_line_starting_pos = State.line_cache[State.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 new_screen_line_starting_byte_offset = Text.offset(State.lines[State.cursor1.line].data, new_screen_line_starting_pos)
|
|
local s = string.sub(State.lines[State.cursor1.line].data, new_screen_line_starting_byte_offset)
|
|
State.cursor1.pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(State.font, s, State.cursor_x, State.left) - 1
|
|
--? print('cursor pos is now', State.cursor1.line, State.cursor1.pos)
|
|
if scroll_down then
|
|
--? print('scroll up preserving cursor')
|
|
Text.snap_cursor_to_bottom_of_screen(State)
|
|
--? print('screen top after:', State.screen_top1.line, State.screen_top1.pos)
|
|
end
|
|
end
|
|
--? print('=>', State.cursor1.line, State.cursor1.pos, State.screen_top1.line, State.screen_top1.pos)
|
|
end
|
|
|
|
function Text.start_of_line(State)
|
|
State.cursor1.pos = 1
|
|
if Text.lt1(State.cursor1, State.screen_top1) then
|
|
State.screen_top1 = deepcopy(State.cursor1)
|
|
end
|
|
end
|
|
|
|
function Text.end_of_line(State)
|
|
State.cursor1.pos = utf8.len(State.lines[State.cursor1.line].data) + 1
|
|
if Text.cursor_out_of_screen(State) then
|
|
Text.snap_cursor_to_bottom_of_screen(State)
|
|
end
|
|
end
|
|
|
|
function Text.word_left(State)
|
|
-- skip some whitespace
|
|
while true do
|
|
if State.cursor1.pos == 1 then
|
|
break
|
|
end
|
|
if Text.match(State.lines[State.cursor1.line].data, State.cursor1.pos-1, '%S') then
|
|
break
|
|
end
|
|
Text.left(State)
|
|
end
|
|
-- skip some non-whitespace
|
|
while true do
|
|
Text.left(State)
|
|
if State.cursor1.pos == 1 then
|
|
break
|
|
end
|
|
assert(State.cursor1.pos > 1, 'bumped up against start of line')
|
|
if Text.match(State.lines[State.cursor1.line].data, State.cursor1.pos-1, '%s') then
|
|
break
|
|
end
|
|
end
|
|
end
|
|
|
|
function Text.word_right(State)
|
|
-- skip some whitespace
|
|
while true do
|
|
if State.cursor1.pos > utf8.len(State.lines[State.cursor1.line].data) then
|
|
break
|
|
end
|
|
if Text.match(State.lines[State.cursor1.line].data, State.cursor1.pos, '%S') then
|
|
break
|
|
end
|
|
Text.right_without_scroll(State)
|
|
end
|
|
while true do
|
|
Text.right_without_scroll(State)
|
|
if State.cursor1.pos > utf8.len(State.lines[State.cursor1.line].data) then
|
|
break
|
|
end
|
|
if Text.match(State.lines[State.cursor1.line].data, State.cursor1.pos, '%s') then
|
|
break
|
|
end
|
|
end
|
|
if Text.cursor_out_of_screen(State) then
|
|
Text.snap_cursor_to_bottom_of_screen(State)
|
|
end
|
|
end
|
|
|
|
function Text.match(s, pos, pat)
|
|
local start_offset = Text.offset(s, pos)
|
|
local end_offset = Text.offset(s, pos+1)
|
|
assert(end_offset > start_offset, ('end_offset %d not > start_offset %d'):format(end_offset, start_offset))
|
|
local curr = s:sub(start_offset, end_offset-1)
|
|
return curr:match(pat)
|
|
end
|
|
|
|
function Text.left(State)
|
|
if State.cursor1.pos > 1 then
|
|
State.cursor1.pos = State.cursor1.pos-1
|
|
elseif State.cursor1.line > 1 then
|
|
State.cursor1.line = State.cursor1.line-1
|
|
State.cursor1.pos = utf8.len(State.lines[State.cursor1.line].data) + 1
|
|
end
|
|
if Text.lt1(State.cursor1, State.screen_top1) then
|
|
State.screen_top1 = {
|
|
line=State.cursor1.line,
|
|
pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
|
|
}
|
|
Text.redraw_all(State) -- if we're scrolling, reclaim all line caches to avoid memory leaks
|
|
end
|
|
end
|
|
|
|
function Text.right(State)
|
|
Text.right_without_scroll(State)
|
|
if Text.cursor_out_of_screen(State) then
|
|
Text.snap_cursor_to_bottom_of_screen(State)
|
|
end
|
|
end
|
|
|
|
function Text.right_without_scroll(State)
|
|
if State.cursor1.pos <= utf8.len(State.lines[State.cursor1.line].data) then
|
|
State.cursor1.pos = State.cursor1.pos+1
|
|
elseif State.cursor1.line <= #State.lines-1 then
|
|
State.cursor1.line = State.cursor1.line+1
|
|
State.cursor1.pos = 1
|
|
end
|
|
end
|
|
|
|
-- result: pos, index of screen line
|
|
function Text.pos_at_start_of_screen_line(State, loc1)
|
|
Text.populate_screen_line_starting_pos(State, loc1.line)
|
|
local line_cache = State.line_cache[loc1.line]
|
|
for i=#line_cache.screen_line_starting_pos,1,-1 do
|
|
local spos = line_cache.screen_line_starting_pos[i]
|
|
if spos <= loc1.pos then
|
|
return spos,i
|
|
end
|
|
end
|
|
assert(false, ('invalid pos %d'):format(loc1.pos))
|
|
end
|
|
|
|
function Text.pos_at_end_of_screen_line(State, loc1)
|
|
Text.populate_screen_line_starting_pos(State, loc1.line)
|
|
local line_cache = State.line_cache[loc1.line]
|
|
local most_recent_final_pos = utf8.len(State.lines[loc1.line].data)+1
|
|
for i=#line_cache.screen_line_starting_pos,1,-1 do
|
|
local spos = line_cache.screen_line_starting_pos[i]
|
|
if spos <= loc1.pos then
|
|
return most_recent_final_pos
|
|
end
|
|
most_recent_final_pos = spos-1
|
|
end
|
|
assert(false, ('invalid pos %d'):format(loc1.pos))
|
|
end
|
|
|
|
function Text.final_text_loc_on_screen(State)
|
|
local screen_bottom1 = Text.screen_bottom1(State)
|
|
return {
|
|
line=screen_bottom1.line,
|
|
pos=Text.pos_at_end_of_screen_line(State, screen_bottom1),
|
|
}
|
|
end
|
|
|
|
function Text.cursor_at_final_screen_line(State)
|
|
Text.populate_screen_line_starting_pos(State, State.cursor1.line)
|
|
local screen_lines = State.line_cache[State.cursor1.line].screen_line_starting_pos
|
|
--? print(screen_lines[#screen_lines], State.cursor1.pos)
|
|
return screen_lines[#screen_lines] <= State.cursor1.pos
|
|
end
|
|
|
|
function Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary(State)
|
|
if State.top > App.screen.height - State.line_height then
|
|
--? print('scroll up')
|
|
Text.snap_cursor_to_bottom_of_screen(State)
|
|
end
|
|
end
|
|
|
|
-- should never modify State.cursor1
|
|
function Text.snap_cursor_to_bottom_of_screen(State)
|
|
--? print('to2:', State.cursor1.line, State.cursor1.pos)
|
|
local top2 = Text.to2(State, State.cursor1)
|
|
--? print('to2: =>', top2.line, top2.screen_line, top2.screen_pos)
|
|
-- slide to start of screen line
|
|
top2.screen_pos = 1 -- start of screen line
|
|
--? print('snap', State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos)
|
|
--? print('cursor pos '..tostring(State.cursor1.pos)..' is on the #'..tostring(top2.screen_line)..' screen line down')
|
|
local y = App.screen.height - State.line_height
|
|
-- duplicate some logic from love.draw
|
|
while true do
|
|
--? print(y, 'top2:', top2.line, top2.screen_line, top2.screen_pos)
|
|
if top2.line == 1 and top2.screen_line == 1 then break end
|
|
local h = State.line_height
|
|
if y - h < State.top then
|
|
break
|
|
end
|
|
y = y - h
|
|
top2 = Text.previous_screen_line(State, top2)
|
|
end
|
|
--? print('top2 finally:', top2.line, top2.screen_line, top2.screen_pos)
|
|
State.screen_top1 = Text.to1(State, top2)
|
|
--? print('top1 finally:', State.screen_top1.line, State.screen_top1.pos)
|
|
--? print('snap =>', State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos)
|
|
Text.redraw_all(State) -- if we're scrolling, reclaim all line caches to avoid memory leaks
|
|
end
|
|
|
|
function Text.in_line(State, line_index, x,y)
|
|
local line = State.lines[line_index]
|
|
local line_cache = State.line_cache[line_index]
|
|
local starty = Text.starty(State, line_index)
|
|
if starty == nil then return false end -- outside current page
|
|
if y < starty then return false end
|
|
Text.populate_screen_line_starting_pos(State, line_index)
|
|
return y < starty + State.line_height*(#line_cache.screen_line_starting_pos - Text.screen_line_index(line_cache.screen_line_starting_pos, line_cache.startpos) + 1)
|
|
end
|
|
|
|
-- convert mx,my in pixels to schema-1 coordinates
|
|
function Text.to_pos_on_line(State, line_index, mx, my)
|
|
local line = State.lines[line_index]
|
|
local line_cache = State.line_cache[line_index]
|
|
local starty = Text.starty(State, line_index)
|
|
assert(my >= starty, 'failed to map y pixel to line')
|
|
-- duplicate some logic from Text.draw
|
|
local y = starty
|
|
local start_screen_line_index = Text.screen_line_index(line_cache.screen_line_starting_pos, line_cache.startpos)
|
|
for screen_line_index = start_screen_line_index,#line_cache.screen_line_starting_pos do
|
|
local screen_line_starting_pos = line_cache.screen_line_starting_pos[screen_line_index]
|
|
local screen_line_starting_byte_offset = Text.offset(line.data, screen_line_starting_pos)
|
|
--? print('iter', y, screen_line_index, screen_line_starting_pos, string.sub(line.data, screen_line_starting_byte_offset))
|
|
local nexty = y + State.line_height
|
|
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 screen_line_index < #line_cache.screen_line_starting_pos and mx > State.left + Text.screen_line_width(State, line_index, screen_line_index) then
|
|
--? print('past end of non-final line; return')
|
|
return line_cache.screen_line_starting_pos[screen_line_index+1]
|
|
end
|
|
local s = string.sub(line.data, screen_line_starting_byte_offset)
|
|
--? print('return', mx, Text.nearest_cursor_pos(State.font, s, mx, State.left), '=>', screen_line_starting_pos + Text.nearest_cursor_pos(State.font, s, mx, State.left) - 1)
|
|
return screen_line_starting_pos + Text.nearest_cursor_pos(State.font, s, mx, State.left) - 1
|
|
end
|
|
y = nexty
|
|
end
|
|
assert(false, 'failed to map y pixel to line')
|
|
end
|
|
|
|
function Text.screen_line_width(State, line_index, i)
|
|
local line = State.lines[line_index]
|
|
local line_cache = State.line_cache[line_index]
|
|
local start_pos = line_cache.screen_line_starting_pos[i]
|
|
local start_offset = Text.offset(line.data, start_pos)
|
|
local screen_line
|
|
if i < #line_cache.screen_line_starting_pos then
|
|
local past_end_pos = line_cache.screen_line_starting_pos[i+1]
|
|
local past_end_offset = Text.offset(line.data, past_end_pos)
|
|
screen_line = string.sub(line.data, start_offset, past_end_offset-1)
|
|
else
|
|
screen_line = string.sub(line.data, start_pos)
|
|
end
|
|
return State.font:getWidth(screen_line)
|
|
end
|
|
|
|
function Text.screen_line_index(screen_line_starting_pos, pos)
|
|
for i = #screen_line_starting_pos,1,-1 do
|
|
if screen_line_starting_pos[i] <= pos then
|
|
return i
|
|
end
|
|
end
|
|
end
|
|
|
|
-- convert x pixel coordinate to pos
|
|
-- oblivious to wrapping
|
|
-- result: 1 to len+1
|
|
function Text.nearest_cursor_pos(font, line, x, left)
|
|
if x < left then
|
|
return 1
|
|
end
|
|
local len = utf8.len(line)
|
|
local max_x = left+Text.x(font, line, len+1)
|
|
if x > max_x then
|
|
return len+1
|
|
end
|
|
local leftpos, rightpos = 1, len+1
|
|
--? print('-- nearest', x)
|
|
while true do
|
|
--? print('nearest', x, '^'..line..'$', leftpos, rightpos)
|
|
if leftpos == rightpos then
|
|
return leftpos
|
|
end
|
|
local curr = math.floor((leftpos+rightpos)/2)
|
|
local currxmin = left+Text.x(font, line, curr)
|
|
local currxmax = left+Text.x(font, line, curr+1)
|
|
--? print('nearest', x, leftpos, rightpos, curr, currxmin, currxmax)
|
|
if currxmin <= x and x < currxmax then
|
|
if x-currxmin < currxmax-x then
|
|
return curr
|
|
else
|
|
return curr+1
|
|
end
|
|
end
|
|
if leftpos >= rightpos-1 then
|
|
return rightpos
|
|
end
|
|
if currxmin > x then
|
|
rightpos = curr
|
|
else
|
|
leftpos = curr
|
|
end
|
|
end
|
|
assert(false, 'failed to map x pixel to pos')
|
|
end
|
|
|
|
-- return the nearest index of line (in utf8 code points) which lies entirely
|
|
-- within x pixels of the left margin
|
|
-- result: 0 to len+1
|
|
function Text.nearest_pos_less_than(font, line, x)
|
|
--? print('', '-- nearest_pos_less_than', line, x)
|
|
local len = utf8.len(line)
|
|
local max_x = Text.x_after(font, line, len)
|
|
if x > max_x then
|
|
return len+1
|
|
end
|
|
local left, right = 0, len+1
|
|
while true do
|
|
local curr = math.floor((left+right)/2)
|
|
local currxmin = Text.x_after(font, line, curr+1)
|
|
local currxmax = Text.x_after(font, line, curr+2)
|
|
--? print('', x, left, right, curr, currxmin, currxmax)
|
|
if currxmin <= x and x < currxmax then
|
|
return curr
|
|
end
|
|
if left >= right-1 then
|
|
return left
|
|
end
|
|
if currxmin > x then
|
|
right = curr
|
|
else
|
|
left = curr
|
|
end
|
|
end
|
|
assert(false, 'failed to map x pixel to pos')
|
|
end
|
|
|
|
function Text.x_after(font, s, pos)
|
|
local len = utf8.len(s)
|
|
local offset = Text.offset(s, math.min(pos+1, len+1))
|
|
local s_before = s:sub(1, offset-1)
|
|
--? print('^'..s_before..'$')
|
|
return font:getWidth(s_before)
|
|
end
|
|
|
|
function Text.x(font, s, pos)
|
|
local offset = Text.offset(s, pos)
|
|
local s_before = s:sub(1, offset-1)
|
|
return font:getWidth(s_before)
|
|
end
|
|
|
|
function Text.to2(State, loc1)
|
|
local result = {line=loc1.line}
|
|
local line_cache = State.line_cache[loc1.line]
|
|
Text.populate_screen_line_starting_pos(State, loc1.line)
|
|
for i=#line_cache.screen_line_starting_pos,1,-1 do
|
|
local spos = line_cache.screen_line_starting_pos[i]
|
|
if spos <= loc1.pos then
|
|
result.screen_line = i
|
|
result.screen_pos = loc1.pos - spos + 1
|
|
break
|
|
end
|
|
end
|
|
assert(result.screen_pos, 'failed to convert schema-1 coordinate to schema-2')
|
|
return result
|
|
end
|
|
|
|
function Text.to1(State, loc2)
|
|
local result = {line=loc2.line, pos=loc2.screen_pos}
|
|
if loc2.screen_line > 1 then
|
|
result.pos = State.line_cache[loc2.line].screen_line_starting_pos[loc2.screen_line] + loc2.screen_pos - 1
|
|
end
|
|
return result
|
|
end
|
|
|
|
function Text.eq1(a, b)
|
|
return a.line == b.line and a.pos == b.pos
|
|
end
|
|
|
|
function Text.lt1(a, b)
|
|
if a.line < b.line then
|
|
return true
|
|
end
|
|
if a.line > b.line then
|
|
return false
|
|
end
|
|
return a.pos < b.pos
|
|
end
|
|
|
|
function Text.le1(a, b)
|
|
if a.line < b.line then
|
|
return true
|
|
end
|
|
if a.line > b.line then
|
|
return false
|
|
end
|
|
return a.pos <= b.pos
|
|
end
|
|
|
|
function Text.eq2(a, b)
|
|
return a.line == b.line and a.screen_line == b.screen_line and a.screen_pos == b.screen_pos
|
|
end
|
|
|
|
function Text.offset(s, pos1)
|
|
if pos1 == 1 then return 1 end
|
|
local result = utf8.offset(s, pos1)
|
|
if result == nil then
|
|
assert(false, ('Text.offset(%d) called on a string of length %d (byte size %d); this is likely a failure to handle utf8\n\n^%s$\n'):format(pos1, utf8.len(s), #s, s))
|
|
end
|
|
return result
|
|
end
|
|
|
|
function Text.previous_screen_line(State, loc2)
|
|
if loc2.screen_line > 1 then
|
|
return {line=loc2.line, screen_line=loc2.screen_line-1, screen_pos=1}
|
|
elseif loc2.line == 1 then
|
|
return loc2
|
|
else
|
|
local l = State.lines[loc2.line-1]
|
|
Text.populate_screen_line_starting_pos(State, loc2.line-1)
|
|
return {line=loc2.line-1, screen_line=#State.line_cache[loc2.line-1].screen_line_starting_pos, screen_pos=1}
|
|
end
|
|
end
|
|
|
|
function Text.next_screen_line(State, loc2)
|
|
Text.populate_screen_line_starting_pos(State, loc2.line)
|
|
if loc2.screen_line >= #State.line_cache[loc2.line].screen_line_starting_pos then
|
|
if loc2.line < #State.lines then
|
|
return {line=loc2.line+1, screen_line=1, screen_pos=1}
|
|
else
|
|
return loc2
|
|
end
|
|
else
|
|
return {line=loc2.line, screen_line=loc2.screen_line+1, screen_pos=1}
|
|
end
|
|
end
|
|
|
|
-- resize helper
|
|
function Text.tweak_screen_top_and_cursor(State)
|
|
--? print('a', State.selection1.line)
|
|
if State.screen_top1.pos == 1 then return end
|
|
Text.populate_screen_line_starting_pos(State, State.screen_top1.line)
|
|
local line = State.lines[State.screen_top1.line]
|
|
local line_cache = State.line_cache[State.screen_top1.line]
|
|
for i=2,#line_cache.screen_line_starting_pos do
|
|
local pos = line_cache.screen_line_starting_pos[i]
|
|
if pos == State.screen_top1.pos then
|
|
break
|
|
end
|
|
if pos > State.screen_top1.pos then
|
|
-- make sure screen top is at start of a screen line
|
|
local prev = line_cache.screen_line_starting_pos[i-1]
|
|
if State.screen_top1.pos - prev < pos - State.screen_top1.pos then
|
|
State.screen_top1.pos = prev
|
|
else
|
|
State.screen_top1.pos = pos
|
|
end
|
|
break
|
|
end
|
|
end
|
|
-- make sure cursor is on screen
|
|
local screen_bottom1 = Text.screen_bottom1(State)
|
|
if Text.lt1(State.cursor1, State.screen_top1) then
|
|
State.cursor1 = deepcopy(State.screen_top1)
|
|
elseif State.cursor1.line >= screen_bottom1.line then
|
|
if Text.cursor_out_of_screen(State) then
|
|
State.cursor1 = Text.final_text_loc_on_screen(State)
|
|
end
|
|
end
|
|
end
|
|
|
|
-- slightly expensive since it redraws the screen
|
|
function Text.cursor_out_of_screen(State)
|
|
edit.draw(State, --[[should be drawn over]] Cursor_color)
|
|
return State.cursor_y == nil
|
|
end
|
|
|
|
function Text.redraw_all(State)
|
|
--? print('clearing line caches')
|
|
-- Perform some early sanity checking here, in hopes that we correctly call
|
|
-- this whenever we change editor state.
|
|
if State.right <= State.left then
|
|
assert(false, ('Right margin %d must be to the right of the left margin %d'):format(State.right, State.left))
|
|
end
|
|
|
|
State.line_cache = {}
|
|
for i=1,#State.lines do
|
|
State.line_cache[i] = {}
|
|
end
|
|
end
|
|
|
|
function Text.clear_screen_line_cache(State, line_index)
|
|
State.line_cache[line_index].screen_line_starting_pos = nil
|
|
end
|
|
|
|
function trim(s)
|
|
return s:gsub('^%s+', ''):gsub('%s+$', '')
|
|
end
|
|
|
|
function ltrim(s)
|
|
return s:gsub('^%s+', '')
|
|
end
|
|
|
|
function rtrim(s)
|
|
return s:gsub('%s+$', '')
|
|
end
|
|
|
|
function starts_with(s, prefix)
|
|
if #s < #prefix then
|
|
return false
|
|
end
|
|
for i=1,#prefix do
|
|
if s:sub(i,i) ~= prefix:sub(i,i) then
|
|
return false
|
|
end
|
|
end
|
|
return true
|
|
end
|
|
|
|
function ends_with(s, suffix)
|
|
if #s < #suffix then
|
|
return false
|
|
end
|
|
for i=0,#suffix-1 do
|
|
if s:sub(#s-i,#s-i) ~= suffix:sub(#suffix-i,#suffix-i) then
|
|
return false
|
|
end
|
|
end
|
|
return true
|
|
end
|