parkour/input.lua

   1 local M = {}
   2
   3 local function startof(node) return node.start end
   4 local function finishof(node) return node.finish end
   5
   6 local function make_insert(parser, d1, D2, walker, edit, write, eol_at, bol_at)
   7
   8         local function open(range, seek, opening, auto_square)
   9                 local escaped = walker.escaped_at(range)
  10                 if escaped and range.start > escaped.start then
  11                         if opening == escaped.d then
  12                                 seek(escaped.finish + 1)
  13                                 return true
  14                         elseif escaped.is_char then
  15                                 return true
  16                         end
  17                         write(range.start, opening)
  18                         seek(range.start + #opening)
  19                         parser.tree.rewind(escaped.start)
  20                 else
  21                         local _, parent = walker.sexp_at(range)
  22                         -- TODO: make it work even when before the first existing element on the electric line:
  23                         local on_electric_line = parent.finish and parent.finish > eol_at(range.finish)
  24                                 and not parent.find_after(range, function(t) return t.indent end)
  25                         local newpos = edit.insert_pair(range, opening, auto_square)
  26                         seek(edit.refmt_at(parent, {start = newpos, finish = newpos}, on_electric_line))
  27                 end
  28                 return true
  29         end
  30
  31         local function close(range, seek, kind)
  32                 local pos = range.start
  33                 local escaped = walker.escaped_at(range)
  34                 if escaped then
  35                         write(pos, kind)
  36                         seek(pos + 1)
  37                         parser.tree.rewind(escaped.start)
  38                 else
  39                         local _, parent = walker.sexp_at(range)
  40                         if parent and parent.is_list then
  41                                 range = {start = parent.finish, finish = parent.finish}
  42                                 local newpos = edit.refmt_at(parent, range)
  43                                 seek(newpos + 1)
  44                                 parser.tree.rewind(parent.start)
  45                         end
  46                 end
  47                 return true
  48         end
  49
  50         local function spacekey(range, seek, char)
  51                 local sexp, parent = walker.sexp_at(range)
  52                 -- if parent[#parent + 1] is nil, we are at EOF
  53                 if not parent.is_root or parent.is_parsed(range.start) or parent[#parent + 1] then
  54                         parser.tree.rewind(parent.start or range.start)
  55                 end
  56                 if not parent.is_list or parent.is_empty then return end
  57                 local after_last = parent[#parent].finish and range.start > parent[#parent].finish
  58                 local bol = bol_at(range.start)
  59                 local eol = eol_at(range.start)
  60                 local prev = parent.before(range.start, finishof)
  61                 local nxt = parent.after(range.start, startof)
  62                 local on_empty_line = not sexp and ((prev and prev.finish or parent.start) < bol)
  63                         and ((nxt and nxt.start or parent.finish) > eol)
  64                 local at_eol = range.start == eol
  65                 local newpos
  66                 if not on_empty_line then
  67                         local _
  68                         write(range.start, char)
  69                         newpos = range.start + #char
  70                         _, parent = walker.sexp_at(range)
  71                 else
  72                         newpos = bol - 1
  73                 end
  74                 if not at_eol or on_empty_line then
  75                         newpos = edit.refmt_at(parent, {start = newpos, finish = newpos}, after_last and not on_empty_line)
  76                         if on_empty_line then
  77                                 parser.tree.rewind(newpos)
  78                                 write(newpos, char)
  79                                 newpos = newpos + #char
  80                         end
  81                 end
  82                 seek(newpos)
  83                 return true
  84         end
  85
  86         local function enterkey(range, seek)
  87                 local _, parent = walker.sexp_at(range)
  88                 local newpos = edit.newline(parent, range)
  89                 if newpos then
  90                         seek(newpos)
  91                         return true
  92                 end
  93         end
  94
  95         local comment_start = parser.opposite["\n"]
  96
  97         local function open_comment(range, seek, char)
  98                 local escaped = walker.escaped_at(range)
  99                 if escaped and escaped.is_char then return true end
 100                 local datum, sexp, parent, descend_into_next_comment, stay_out
 101                 if not (escaped and range.start > escaped.start) then
 102                         sexp, parent = walker.sexp_at(range, true)
 103                         datum = sexp and sexp.p and sexp.p:find("^#") and range.start == sexp.start + 1
 104                         local _, next_safe = walker.next_finish_wrapped(range)
 105                         local eol = eol_at(range.start)  -- XXX: must be before the write. The vis eol_at wrapper is leaky
 106                         local bol = bol_at(range.start)  -- XXX: must be before the write. The vis eol_at wrapper is leaky
 107                         if next_safe and not datum then
 108                                 write(next_safe, parser.opposite[char])
 109                         end
 110                         if not datum then
 111                                 local prev = parent.before(range.start, finishof)
 112                                 local nxt = parent.after(range.start, startof)
 113                                 local pstart = parent.start or 0
 114                                 local no_sexp_to_the_left =
 115                                         not prev and (pstart < bol or parent.is_root) or
 116                                         sexp and (sexp.indent and range.start == sexp.start or sexp.is_line_comment) or
 117                                         not sexp and prev and prev.finish < bol
 118                                 local comment_out_at =
 119                                         (not sexp or sexp.is_line_comment) and nxt and nxt.finish < eol and nxt.start or
 120                                         sexp and range.start <= sexp.finish and sexp.finish < eol and range.start
 121                                 if no_sexp_to_the_left then
 122                                         if sexp and sexp.is_line_comment and range.start == sexp.start then
 123                                                 descend_into_next_comment = sexp.start + #sexp.d
 124                                         else
 125                                                 if nxt and nxt.is_line_comment and nxt.start < eol then
 126                                                         descend_into_next_comment = nxt.start + #nxt.d
 127                                                 else
 128                                                         char = char:rep(parent.is_root and 3 or 2) .. " "
 129                                                 end
 130                                         end
 131                                 else
 132                                         if (not sexp or range.start == sexp.finish + 1) and
 133                                                 nxt and nxt.is_line_comment and not nxt.indent then
 134                                                 descend_into_next_comment = nxt.start + #nxt.d
 135                                         else
 136                                                 local comment_column = 40
 137                                                 local last_col = range.start - bol + 1
 138                                                 local padding = math.max(1, comment_column - last_col)
 139                                                 char = string.rep(" ", padding)..char
 140                                         end
 141                                 end
 142                                 if not descend_into_next_comment and comment_out_at then
 143                                         stay_out = comment_out_at
 144                                 end
 145                         end
 146                 end
 147                 if stay_out then
 148                         range.start = stay_out
 149                 end
 150                 if not descend_into_next_comment then
 151                         write(range.start, char)
 152                 end
 153                 -- if parent[#parent + 1] is nil, we are at EOF
 154                 if not parent or not parent.is_root or parent.is_parsed(range.start) or parent[#parent + 1] then
 155                         parser.tree.rewind(range.start - (datum and 1 or 0))
 156                 end
 157                 if descend_into_next_comment then
 158                         range.start = descend_into_next_comment
 159                 elseif not stay_out then
 160                         range.start = range.start + #char
 161                 end
 162                 range.finish = range.start
 163                 if not descend_into_next_comment and not escaped and not parent.is_root then
 164                         range.start = edit.refmt_at(parent, range)
 165                 end
 166                 seek(range.start)
 167                 return true
 168         end
 169
 170         return function(range, seek, char, auto_square)
 171                 local handler =
 172                         d1:match(char) and open or
 173                         char == '"' and open or
 174                         parser.opposite["|"] and char == "|" and open or
 175                         D2:match(char) and close or
 176                         char == " " and spacekey or
 177                         char == "\n" and enterkey or
 178                         char == comment_start and open_comment
 179                 if handler then
 180                         return handler(range, seek, char, auto_square)
 181                 else
 182                         if parser.tree.is_parsed(range.start) then
 183                                 parser.tree.rewind(range.start)
 184                         end
 185                 end
 186         end
 187 end
 188
 189 function M.new(parser, d1, D2, walker, edit, write, eol_at, bol_at)
 190         return {
 191                 insert = make_insert(parser, d1, D2, walker, edit, write, eol_at, bol_at),
 192         }
 193 end
 194
 195 return M