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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",
}
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 global = _G
-- beware: all multiline is messy, so even if it's no lexer, it should be an embedded lexer
module(...)
local lualexer = _M
_directives = { } -- communication channel
-- this will be eextended
local keywords = {
'and', 'break', 'do', 'else', 'elseif', 'end', 'false', 'for', 'function',
'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 longtwostring = P(function(input,index)
if level then
local sentinel = ']' .. level .. ']'
local _, stop = find(input,sentinel,index,true)
return stop and stop + 1 - #sentinel or #input + 1
end
end)
-- local longtwostart = P("[") * Cg(equals, "init") * P("[")
-- local longtwostop = P("]") * C(equals) * P("]")
-- local longtwocheck = Cmt(longtwostop * Cb("init"), function(s,i,a,b) return a == b end)
-- local longtwostring = (P(1) - longtwocheck)^0
local longcomment = Cmt(#('[[' + ('[' * P('=')^0 * '[')), function(input,index)
local level = match(input,'^%[(=*)%[',index)
level = "=="
if level then
local _, stop = find(input,']' .. level .. ']',index,true)
return stop and stop + 1 or #input + 1
end
end)
local longcomment = Cmt(#('[[' + ('[' * C(P('=')^0) * '[')), function(input,index,level)
local _, stop = find(input,']' .. level .. ']',index,true)
return stop and stop + 1 or #input + 1
end)
local whitespace = lualexer.WHITESPACE -- triggers states
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 tiem 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)
local longstring = token("quote", longonestart)
* token("string", longonestring)
* token("quote", longonestop)
+ token("quote", longtwostart)
* token("string", longtwostring)
* token("quote", longtwostop)
local string = shortstring
+ longstring
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)
local operator = token("special", P('..') + P('~=') + S('+-*/%^#=<>;:,.{}[]()')) -- maybe split off {}[]()
local optionalspace = spacing^0
local hasargument = #S("{(")
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
)
_rules = {
{ 'whitespace', spacing },
{ 'keyword', keyword },
{ 'function', builtin },
{ 'csname', csname },
{ 'constant', constant },
{ 'identifier', identifier },
{ 'string', string },
{ 'number', number },
{ 'longcomment', longcomment },
{ 'shortcomment', shortcomment },
-- { 'number', number },
{ 'operator', operator },
{ 'rest', rest },
}
_tokenstyles = lexer.context.styleset
_foldsymbols = {
_patterns = {
'%l+',
-- '[%({%)}%[%]]',
'[{}%[%]]',
},
['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)
_rules_cld = {
{ 'whitespace', spacing },
{ 'texstring', texstring },
{ 'texcomment', texcomment },
{ 'texcommand', texcommand },
{ '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 },
}
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