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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",
}
if not lexer._CONTEXTEXTENSIONS then require("scite-context-lexer") end
local lexer = lexer
local token, style, colors, exact_match, no_style = lexer.token, lexer.style, lexer.colors, lexer.exact_match, lexer.style_nothing
local P, R, S, C, Cg, Cb, Cs, Cmt = lpeg.P, lpeg.R, lpeg.S, lpeg.C, lpeg.Cg, lpeg.Cb, lpeg.Cs, lpeg.Cmt
local match, find = string.match, string.find
local setmetatable = setmetatable
-- 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 lualexer = { _NAME = "lua", _FILENAME = "scite-context-lexer-lua" }
local whitespace = lexer.WHITESPACE
local context = lexer.context
local stringlexer = lexer.load("scite-context-lexer-lua-longstring")
local directives = { } -- communication channel
-- this will be extended
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', 'getfenv', 'getmetatable',
'ipairs', 'load', 'loadfile', 'loadstring', 'module', 'next', 'pairs',
'pcall', 'print', 'rawequal', 'rawget', 'rawset', 'require', 'setfenv',
'setmetatable', 'tonumber', 'tostring', 'type', 'unpack', 'xpcall', "select",
}
local constants = {
'_G', '_VERSION', '_M', "...",
}
local depricated = {
"arg", "arg.n",
}
local csnames = { -- todo: option
"context",
"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 = lexer.space -- S(" \n\r\t\f\v")
local any = lexer.any
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 * lexer.nonnewline^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 * (lexer.hex_num + lexer.dec_num)
local number = token("number", lexer.float + integer)
-- officially 127-255 are ok but not utf so useless
local validword = R("AZ","az","__") * R("AZ","az","__","09")^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 {}[]()
local operator = token("special", S('+-*/%^#=<>;:,{}[]().') + P('~=') ) -- 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 keyword = token("keyword", exact_match(keywords ))
local builtin = token("plain", exact_match(functions))
local constant = token("data", exact_match(constants))
local csname = token("user", exact_match(csnames ))
* (
optionalspace * hasargument
+ ( optionalspace * token("special", P(".")) * optionalspace * token("user", validword) )^1
)
lualexer._rules = {
{ 'whitespace', spacing },
{ 'keyword', keyword },
-- { 'structure', structure },
{ 'function', builtin },
{ 'csname', csname },
{ 'constant', constant },
{ 'goto', gotokeyword },
{ 'identifier', identifier },
{ 'string', string },
{ 'number', number },
{ 'longcomment', longcomment },
{ 'shortcomment', shortcomment },
-- { 'number', number },
{ 'label', gotolabel },
{ 'operator', operator },
{ 'rest', rest },
}
lualexer._tokenstyles = context.styleset
lualexer._foldsymbols = {
_patterns = {
-- '%l+', -- costly
-- '%l%l+',
'[a-z][a-z]+',
-- '[%({%)}%[%]]',
'[{}%[%]]',
},
['keyword'] = { -- challenge: if=0 then=1 else=-1 elseif=-1
['if'] = 1,
['end'] = -1,
['do'] = 1,
['function'] = 1,
['repeat'] = 1,
['until'] = -1,
},
['comment'] = {
['['] = 1, [']'] = -1,
},
['quote'] = { -- to be tested
['['] = 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)
-- local 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
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