summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/context/data/scite/lexers/scite-context-lexer-lua.lua
blob: c44d586bab5ad5bc053c403832c54b84f5c5bd9c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
local info = {
    version   = 1.002,
    comment   = "scintilla lpeg lexer for lua",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files",
}

-- beware: all multiline is messy, so even if it's no lexer, it should be an embedded lexer
-- we probably could use a local whitespace variant but this is cleaner

local P, R, S, C, Cmt, Cp = lpeg.P, lpeg.R, lpeg.S, lpeg.C, lpeg.Cmt, lpeg.Cp
local match, find = string.match, string.find
local setmetatable = setmetatable

local lexer       = require("lexer")
local context     = lexer.context
local patterns    = context.patterns

local token       = lexer.token
local exact_match = lexer.exact_match
local just_match  = lexer.just_match

local lualexer    = lexer.new("lua","scite-context-lexer-lua")
local whitespace  = lualexer.whitespace

local stringlexer = lexer.load("scite-context-lexer-lua-longstring")

local directives  = { } -- communication channel

-- this will be extended

-- we could combine some in a hash that returns the class that then makes the token
-- this can save time on large files

local keywords = {
    "and", "break", "do", "else", "elseif", "end", "false", "for", "function", -- "goto",
    "if", "in", "local", "nil", "not", "or", "repeat", "return", "then", "true",
    "until", "while",
}

local functions = {
    "assert", "collectgarbage", "dofile", "error", "getmetatable",
    "ipairs", "load", "loadfile", "module", "next", "pairs",
    "pcall", "print", "rawequal", "rawget", "rawset", "require",
    "setmetatable", "tonumber", "tostring", "type", "unpack", "xpcall", "select",

    "string", "table", "coroutine", "debug", "file", "io", "lpeg", "math", "os", "package", "bit32",
}

local constants = {
    "_G", "_VERSION", "_M", "...", "_ENV",
    -- here too
    "__add", "__call", "__concat", "__div", "__idiv", "__eq", "__gc", "__index",
    "__le", "__lt", "__metatable", "__mode", "__mul", "__newindex",
    "__pow", "__sub", "__tostring", "__unm", "__len",
    "__pairs", "__ipairs",
    "NaN",
}

-- local tokenmappings = { }
--
-- for i=1,#keywords  do tokenmappings[keywords [i]] = "keyword"  }
-- for i=1,#functions do tokenmappings[functions[i]] = "function" }
-- for i=1,#constants do tokenmappings[constants[i]] = "constant" }

local internals = { -- __
    "add", "call", "concat", "div", "eq", "gc", "index",
    "le", "lt", "metatable", "mode", "mul", "newindex",
    "pow", "sub", "tostring", "unm", "len",
}

local depricated = {
    "arg", "arg.n",
    "loadstring", "setfenv", "getfenv",
    "pack",
}

local csnames = { -- todo: option
    "commands",
    "context",
    "ctx",
    "metafun",
    "metapost",
}

local level         = nil
local setlevel      = function(_,i,s) level = s return i end

local equals        = P("=")^0

local longonestart  = P("[[")
local longonestop   = P("]]")
local longonestring = (1-longonestop)^0

local longtwostart  = P("[") * Cmt(equals,setlevel) * P("[")
local longtwostop   = P("]") *     equals           * P("]")

local sentinels = { } setmetatable(sentinels, { __index = function(t,k) local v = "]" .. k .. "]" t[k] = v return v end })

local longtwostring = P(function(input,index)
    if level then
     -- local sentinel = "]" .. level .. "]"
        local sentinel = sentinels[level]
        local _, stop = find(input,sentinel,index,true)
        return stop and stop + 1 - #sentinel or #input + 1
    end
end)

    local longtwostring_body = longtwostring

    local longtwostring_end = P(function(input,index)
        if level then
         -- local sentinel = "]" .. level .. "]"
            local sentinel = sentinels[level]
            local _, stop = find(input,sentinel,index,true)
            return stop and stop + 1 or #input + 1
        end
    end)

local longcomment = Cmt(#("[[" + ("[" * C(equals) * "[")), function(input,index,level)
 -- local sentinel = "]" .. level .. "]"
    local sentinel = sentinels[level]
    local _, stop = find(input,sentinel,index,true)
    return stop and stop + 1 or #input + 1
end)

local space         = patterns.space -- S(" \n\r\t\f\v")
local any           = patterns.any
local eol           = patterns.eol

local squote        = P("'")
local dquote        = P('"')
local escaped       = P("\\") * P(1)
local dashes        = P("--")

local spacing       = token(whitespace, space^1)
local rest          = token("default",  any)

local shortcomment  = token("comment", dashes * (1-eol)^0)
local longcomment   = token("comment", dashes * longcomment)

-- fails on very long string with \ at end of lines (needs embedded lexer)
-- and also on newline before " but it makes no sense to waste time on it

local shortstring   = token("quote",  dquote)
                    * token("string", (escaped + (1-dquote))^0)
                    * token("quote",  dquote)
                    + token("quote",  squote)
                    * token("string", (escaped + (1-squote))^0)
                    * token("quote",  squote)

----- longstring    = token("quote",  longonestart)
-----               * token("string", longonestring)
-----               * token("quote",  longonestop)
-----               + token("quote",  longtwostart)
-----               * token("string", longtwostring)
-----               * token("quote",  longtwostop)

local string        = shortstring
-----               + longstring

lexer.embed_lexer(lualexer, stringlexer, token("quote",longtwostart), token("string",longtwostring_body) * token("quote",longtwostring_end))

local integer       = P("-")^-1 * (patterns.hexadecimal + patterns.decimal)
local number        = token("number", patterns.float + integer)

-- officially 127-255 are ok but not utf so useless

----- validword     = R("AZ","az","__") * R("AZ","az","__","09")^0

local utf8character = P(1) * R("\128\191")^1
local validword     = (R("AZ","az","__") + utf8character) * (R("AZ","az","__","09") + utf8character)^0
local validsuffix   = (R("AZ","az")      + utf8character) * (R("AZ","az","__","09") + utf8character)^0

local identifier    = token("default",validword)

----- operator      = token("special", P('..') + P('~=') + S('+-*/%^#=<>;:,.{}[]()')) -- maybe split off {}[]()
----- operator      = token("special", S('+-*/%^#=<>;:,{}[]()') + P('..') + P('.') + P('~=') ) -- maybe split off {}[]()
----- operator      = token("special", S('+-*/%^#=<>;:,{}[]().') + P('~=') ) -- no ^1 because of nested lexers
local operator      = token("special", S('+-*/%^#=<>;:,{}[]().|~')) -- no ^1 because of nested lexers

local structure     = token("special", S('{}[]()'))

local optionalspace = spacing^0
local hasargument   = #S("{([")

local gotokeyword   = token("keyword", P("goto"))
                    * spacing
                    * token("grouping",validword)
local gotolabel     = token("keyword", P("::"))
                    * token("grouping",validword)
                    * token("keyword", P("::"))

local p_keywords    = exact_match(keywords)
local p_functions   = exact_match(functions)
local p_constants   = exact_match(constants)
local p_internals   = P("__")
                    * exact_match(internals)
local p_csnames     = just_match(csnames)
local keyword       = token("keyword", p_keywords)
local builtin       = token("plain",   p_functions)
local constant      = token("data",    p_constants)
local internal      = token("data",    p_internals)
local csname        = token("user",    p_csnames)
                    * (
                        optionalspace * hasargument
                      + ( optionalspace * token("special", S(".:")) * optionalspace * token("user", validword  ) )^1
                      + token("user", P("_") * validsuffix)
                    )

local identifier    = token("default", validword)
                    * ( optionalspace * token("special", S(".:")) * optionalspace * (
                            token("warning", p_keywords) +
                            token("data", p_internals) +
                            token("default", validword )
                    ) )^0

-- local t = { } for k, v in next, tokenmappings do t[#t+1] = k end t = table.concat(t)
-- -- local experimental =  (S(t)^1) / function(s) return tokenmappings[s] end * Cp()
--
-- local experimental =  Cmt(S(t)^1, function(_,i,s)
--     local t = tokenmappings[s]
--     if t then
--         return true, t, i
--     end
-- end)

lualexer._rules = {
    { "whitespace",   spacing      },
    { "keyword",      keyword      }, -- can be combined
 -- { "structure",    structure    },
    { "function",     builtin      }, -- can be combined
    { "constant",     constant     }, -- can be combined
 -- { "experimental", experimental }, -- works but better split
    { "csname",       csname       },
    { "goto",         gotokeyword  },
    { "identifier",   identifier   },
    { "string",       string       },
    { "number",       number       },
    { "longcomment",  longcomment  },
    { "shortcomment", shortcomment },
    { "label",        gotolabel    },
    { "operator",     operator     },
    { "rest",         rest         },
}

-- -- experiment
--
-- local idtoken = R("az","AZ","__")
--
-- function context.one_of_match(specification)
--     local pattern = idtoken -- the concat catches _ etc
--     local list = { }
--     for i=1,#specification do
--        local style = specification[i][1]
--        local words = specification[i][2]
--        pattern = pattern + S(table.concat(words))
--        for i=1,#words do
--            list[words[i]] = style
--        end
--    end
--    return Cmt(pattern^1, function(_,i,s)
--         local style = list[s]
--         if style then
--             return true, { style, i } -- and i or nil
--         else
--             -- fail
--         end
--    end)
-- end
--
-- local whatever = context.one_of_match {
--     { "keyword", keywords  }, -- keyword
--     { "plain",   functions }, -- builtin
--     { "data",    constants }, -- constant
-- }
--
-- lualexer._rules = {
--     { "whitespace",   spacing      },
--     { "whatever",     whatever     },
--     { "csname",       csname       },
--     { "goto",         gotokeyword  },
--     { "identifier",   identifier   },
--     { "string",       string       },
--     { "number",       number       },
--     { "longcomment",  longcomment  },
--     { "shortcomment", shortcomment },
--     { "label",        gotolabel    },
--     { "operator",     operator     },
--     { "rest",         rest         },
-- }

lualexer._tokenstyles = context.styleset

-- lualexer._foldpattern = R("az")^2 + S("{}[]") -- separate entry else interference

lualexer._foldpattern = (P("end") + P("if") + P("do") + P("function") + P("repeat") + P("until")) * P(#(1 - R("az")))
                      + S("{}[]")

lualexer._foldsymbols = {
    _patterns = {
        "[a-z][a-z]+",
        "[{}%[%]]",
    },
    ["keyword"] = { -- challenge:  if=0  then=1  else=-1  elseif=-1
        ["if"]       =  1, -- if .. [then|else] .. end
        ["do"]       =  1, -- [while] do .. end
        ["function"] =  1, -- function .. end
        ["repeat"]   =  1, -- repeat .. until
        ["until"]    = -1,
        ["end"]      = -1,
      },
    ["comment"] = {
        ["["] = 1, ["]"] = -1,
    },
 -- ["quote"] = { -- confusing
 --     ["["] = 1, ["]"] = -1,
 -- },
    ["special"] = {
     -- ["("] = 1, [")"] = -1,
        ["{"] = 1, ["}"] = -1,
    },
}

-- embedded in tex:

local cstoken         = R("az","AZ","\127\255") + S("@!?_")
local texcsname       = P("\\") * cstoken^1
local commentline     = P("%") * (1-S("\n\r"))^0

local texcomment      = token("comment", Cmt(commentline, function() return directives.cld_inline end))

local longthreestart  = P("\\!!bs")
local longthreestop   = P("\\!!es")
local longthreestring = (1-longthreestop)^0

local texstring       = token("quote",  longthreestart)
                      * token("string", longthreestring)
                      * token("quote",  longthreestop)

----- texcommand      = token("user", texcsname)
local texcommand      = token("warning", texcsname)

-- local texstring    = token("quote", longthreestart)
--                    * (texcommand + token("string",P(1-texcommand-longthreestop)^1) - longthreestop)^0 -- we match long non-\cs sequences
--                    * token("quote", longthreestop)

-- local whitespace    = "whitespace"
-- local spacing       = token(whitespace, space^1)

lualexer._directives = directives

lualexer._rules_cld = {
    { "whitespace",   spacing      },
    { "texstring",    texstring    },
    { "texcomment",   texcomment   },
    { "texcommand",   texcommand   },
 -- { "structure",    structure    },
    { "keyword",      keyword      },
    { "function",     builtin      },
    { "csname",       csname       },
    { "constant",     constant     },
    { "identifier",   identifier   },
    { "string",       string       },
    { "longcomment",  longcomment  },
    { "shortcomment", shortcomment }, -- should not be used inline so best signal it as comment (otherwise complex state till end of inline)
    { "number",       number       },
    { "operator",     operator     },
    { "rest",         rest         },
}

return lualexer