1 -- filename : type-lam.lua
2 -- comment : Pretty printing of (extended) lambda calculus
3 -- author : Matthijs Kooijman, Universiteit Twente, NL
4 -- copyright: Matthijs Kooijman
7 local utf = unicode.utf8
9 if not buffers then buffers = { } end
10 if not buffers.visualizers then buffers.visualizers = { } end
11 if not buffers.visualizers.lam then buffers.visualizers.lam = { } end
13 buffers.visualizers.lam.colors = {
20 buffers.visualizers.lam.tokens = {
21 [' '] = {repr = '\\obs '},
22 ['_'] = {repr = '\\_'},
23 ['->'] = {repr = '\\rightarrow'},
24 -- The default * sits very high above the baseline, \ast (u+2217) looks
26 ['*'] = {repr = '\\ast'},
27 ['case'] = {style = 'bold'},
28 ['of'] = {style = 'bold'},
29 ['let'] = {style = 'bold'},
30 ['in'] = {style = 'bold'},
33 function buffers.visualizers.lam.flush_line(str,nested)
34 local result, state = { }, 0
35 local finish, change = buffers.finish_state, buffers.change_state
36 -- Set the colorscheme, which is used by finish_state and change_state
37 buffers.currentcolors = buffers.visualizers.lam.colors
41 for tok,props in pairs(buffers.visualizers.lam.tokens) do
42 -- Try to remove tok from the start of str
43 str, count = utf.gsub(str, "^" .. tok, "")
45 -- Replace the token with the repr, or just itself
46 result[#result+1] = props.repr or tok
47 -- Enclose the token in {\style .. }
49 result[#result] = "{\\" .. props.style ..
50 " " .. result[#result] ..
53 -- We found a token, now start over
59 result[#result+1] = utf.sub(str, 1, 1)
63 state = finish(state, result)
64 buffers.flush_result(result,nested)
67 -- vim: set sw=4 sts=4 expandtab ai: