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-- helpers for the search bar (C-f)
function Text.draw_search_bar(State)
local h = State.line_height+2
local y = App.screen.height-h
love.graphics.setColor(0.9,0.9,0.9)
love.graphics.rectangle('fill', 0, y-10, App.screen.width-1, h+8)
love.graphics.setColor(0.6,0.6,0.6)
love.graphics.line(0, y-10, App.screen.width-1, y-10)
love.graphics.setColor(1,1,1)
love.graphics.rectangle('fill', 20, y-6, App.screen.width-40, h+2, 2,2)
love.graphics.setColor(0.6,0.6,0.6)
love.graphics.rectangle('line', 20, y-6, App.screen.width-40, h+2, 2,2)
App.color(Text_color)
App.screen.print(State.search_term, 25,y-5)
Text.draw_cursor(State, 25+State.font:getWidth(State.search_term),y-5)
end
function Text.search_next(State)
-- search current line from cursor
local curr_pos = State.cursor1.pos
local curr_line = State.lines[State.cursor1.line].data
local curr_offset = Text.offset(curr_line, curr_pos)
local offset = find(curr_line, State.search_term, curr_offset, --[[literal]] true)
if offset then
State.cursor1.pos = utf8.len(curr_line, 1, offset)
end
if offset == nil then
-- search lines below cursor
for i=State.cursor1.line+1,#State.lines do
local curr_line = State.lines[i].data
offset = find(curr_line, State.search_term, --[[from start]] nil, --[[literal]] true)
if offset then
State.cursor1 = {line=i, pos=utf8.len(curr_line, 1, offset)}
break
end
end
end
if offset == nil then
-- wrap around
for i=1,State.cursor1.line-1 do
local curr_line = State.lines[i].data
offset = find(curr_line, State.search_term, --[[from start]] nil, --[[literal]] true)
if offset then
State.cursor1 = {line=i, pos=utf8.len(curr_line, 1, offset)}
break
end
end
end
if offset == nil then
-- search current line until cursor
local curr_line = State.lines[State.cursor1.line].data
offset = find(curr_line, State.search_term, --[[from start]] nil, --[[literal]] true)
local pos = utf8.len(curr_line, 1, offset)
if pos and pos < State.cursor1.pos then
State.cursor1.pos = pos
end
end
if offset == nil then
State.cursor1.line = State.search_backup.cursor.line
State.cursor1.pos = State.search_backup.cursor.pos
State.screen_top1.line = State.search_backup.screen_top.line
State.screen_top1.pos = State.search_backup.screen_top.pos
end
if Text.lt1(State.cursor1, State.screen_top1) or Text.lt1(State.screen_bottom1, State.cursor1) then
State.screen_top1.line = State.cursor1.line
local pos = Text.pos_at_start_of_screen_line(State, State.cursor1)
State.screen_top1.pos = pos
end
end
function Text.search_previous(State)
-- search current line before cursor
local curr_pos = State.cursor1.pos
local curr_line = State.lines[State.cursor1.line].data
local curr_offset = Text.offset(curr_line, curr_pos)
local offset = rfind(curr_line, State.search_term, curr_offset-1, --[[literal]] true)
if offset then
State.cursor1.pos = utf8.len(curr_line, 1, offset)
end
if offset == nil then
-- search lines above cursor
for i=State.cursor1.line-1,1,-1 do
local curr_line = State.lines[i].data
offset = rfind(curr_line, State.search_term, --[[from end]] nil, --[[literal]] true)
if offset then
State.cursor1 = {line=i, pos=utf8.len(curr_line, 1, offset)}
break
end
end
end
if offset == nil then
-- wrap around
for i=#State.lines,State.cursor1.line+1,-1 do
local curr_line = State.lines[i].data
offset = rfind(curr_line, State.search_term, --[[from end]] nil, --[[literal]] true)
if offset then
State.cursor1 = {line=i, pos=utf8.len(curr_line, 1, offset)}
break
end
end
end
if offset == nil then
-- search current line after cursor
local curr_line = State.lines[State.cursor1.line].data
offset = rfind(curr_line, State.search_term, --[[from end]] nil, --[[literal]] true)
local pos = utf8.len(curr_line, 1, offset)
if pos and pos > State.cursor1.pos then
State.cursor1.pos = pos
end
end
if offset == nil then
State.cursor1.line = State.search_backup.cursor.line
State.cursor1.pos = State.search_backup.cursor.pos
State.screen_top1.line = State.search_backup.screen_top.line
State.screen_top1.pos = State.search_backup.screen_top.pos
end
if Text.lt1(State.cursor1, State.screen_top1) or Text.lt1(State.screen_bottom1, State.cursor1) then
State.screen_top1.line = State.cursor1.line
local pos = Text.pos_at_start_of_screen_line(State, State.cursor1)
State.screen_top1.pos = pos
end
end
function find(s, pat, i, plain)
if s == nil then return end
return s:find(pat, i, plain)
end
-- TODO: avoid the expensive reverse() operations
-- Particularly if we only care about literal matches, we don't need all of string.find
function rfind(s, pat, i, plain)
if s == nil then return end
if #pat == 0 then return #s end
local rs = s:reverse()
local rpat = pat:reverse()
if i == nil then i = #s end
local ri = #s - i + 1
local rendpos = rs:find(rpat, ri, plain)
if rendpos == nil then return nil end
local endpos = #s - rendpos + 1
assert (endpos >= #pat, ('rfind: endpos %d should be >= #pat %d at this point'):format(endpos, #pat))
return endpos-#pat+1
end
function test_rfind()
check_eq(rfind('abc', ''), 3, 'empty pattern')
check_eq(rfind('abc', 'c'), 3, 'final char')
check_eq(rfind('acbc', 'c', 3), 2, 'previous char')
check_nil(rfind('abc', 'd'), 'missing char')
check_nil(rfind('abc', 'c', 2), 'no more char')
end
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