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MIT/X Consortium License

(C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the 
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in 
all copies or substantial portions of the Software. 

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL 
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
DEALINGS IN THE SOFTWARE.
r: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
-- State transitions while colorizing a single line.
-- Just for comments and strings.
-- Limitation: each fragment gets a uniform color so we can only change color
-- at word boundaries.
Next_state = {
  normal={
    {prefix='--[[', target='block_comment'},  -- only single-line for now
    {prefix='--', target='comment'},
    {prefix='"', target='dstring'},
    {prefix="'", target='sstring'},
    {prefix='[[', target='block_string'},  -- only single line for now
  },
  dstring={
    {suffix='"', target='normal'},
  },
  sstring={
    {suffix="'", target='normal'},
  },
  block_string={
    {suffix=']]', target='normal'},
  },
  block_comment={
    {suffix=']]', target='normal'},
  },
  -- comments are a sink
}

Comment_color = {r=0, g=0, b=1}
String_color = {r=0, g=0.5, b=0.5}
Divider_color = {r=0.7, g=0.7, b=0.7}

Colors = {
  normal=Text_color,
  comment=Comment_color,
  sstring=String_color,
  dstring=String_color,
  block_string=String_color,
  block_comment=Comment_color,
}

Current_state = 'normal'

function initialize_color()
--?   print('new line')
  Current_state = 'normal'
end

function select_color(frag)
--?   print('before', '^'..frag..'$', Current_state)
  switch_color_based_on_prefix(frag)
--?   print('using color', Current_state, Colors[Current_state])
  App.color(Colors[Current_state])
  switch_color_based_on_suffix(frag)
--?   print('state after suffix', Current_state)
end

function switch_color_based_on_prefix(frag)
  if Next_state[Current_state] == nil then
    return
  end
  frag = rtrim(frag)
  for _,edge in pairs(Next_state[Current_state]) do
    if edge.prefix and starts_with(frag, edge.prefix) then
      Current_state = edge.target
      break
    end
  end
end

function switch_color_based_on_suffix(frag)
  if Next_state[Current_state] == nil then
    return
  end
  frag = rtrim(frag)
  for _,edge in pairs(Next_state[Current_state]) do
    if edge.suffix and ends_with(frag, edge.suffix) then
      Current_state = edge.target
      break
    end
  end
end