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
 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 on_empty_line = not sexp and
 114                                         ((prev and prev.finish or parent.start or range.start - 1) < bol)
 115                                         and ((nxt and nxt.start or parent.finish or range.start + 1) > eol)
 116                                 if on_empty_line or next_safe == range.start and next_safe ~= parent.finish then
 117                                         if parent.is_root then
 118                                                 char = char:rep(3) .. " "
 119                                         else
 120                                                 char = "\n" .. char:rep(2) .. " "
 121                                         end
 122                                 elseif nxt and nxt.start > eol or range.start == eol then
 123                                         local tabwidth = 8
 124                                         local margin_column = 40
 125                                         local last_col = (not nxt and prev and prev.finish or eol) - bol
 126                                         local margin = math.ceil((margin_column - last_col) / tabwidth)
 127                                         char = (margin > 0 and string.rep("\t", margin) or " ")..char
 128                                 end
 129                         end
 130                 end
 131                 write(range.start, char)
 132                 -- if parent[#parent + 1] is nil, we are at EOF
 133                 if not parent or not parent.is_root or parent.is_parsed(range.start) or parent[#parent + 1] then
 134                         parser.tree.rewind(range.start - (datum and 1 or 0))
 135                 end
 136                 range.start = range.start + #char
 137                 range.finish = range.start
 138                 if not escaped and not parent.is_root then
 139                         range.start = edit.refmt_at(parent, range)
 140                 end
 141                 seek(range.start)
 142                 return true
 143         end
 144
 145         return function(range, seek, char, auto_square)
 146                 local handler =
 147                         d1:match(char) and open or
 148                         char == '"' and open or
 149                         parser.opposite["|"] and char == "|" and open or
 150                         D2:match(char) and close or
 151                         char == " " and spacekey or
 152                         char == "\n" and enterkey or
 153                         char == comment_start and open_comment
 154                 if handler then
 155                         return handler(range, seek, char, auto_square)
 156                 else
 157                         if parser.tree.is_parsed(range.start) then
 158                                 parser.tree.rewind(range.start)
 159                         end
 160                 end
 161         end
 162 end
 163
 164 function M.new(parser, d1, D2, walker, edit, write, eol_at, bol_at)
 165         return {
 166                 insert = make_insert(parser, d1, D2, walker, edit, write, eol_at, bol_at),
 167         }
 168 end
 169
 170 return M