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local info = {
version = 1.002,
comment = "scintilla lpeg lexer for cld/lua",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- Adapted from lua.lua by Mitchell who based it on a lexer by Peter Odding.
local lexer = lexer
local token, style, colors, word_match, no_style = lexer.token, lexer.style, lexer.colors, lexer.word_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
module(...)
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',
}
local constants = {
'_G', '_VERSION',
}
local csnames = {
"context",
"metafun",
}
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 = token(lexer.WHITESPACE, lexer.space^1)
local any_char = lexer.any_char
local squote = P("'")
local dquote = P('"')
local escaped = P("\\") * P(1)
local dashes = P('--')
local shortcomment = dashes * lexer.nonnewline^0
local longcomment = dashes * longcomment
local comment = token(lexer.COMMENT, longcomment + shortcomment)
local shortstring = token("quote", squote)
* token(lexer.STRING, (escaped + (1-squote))^0 )
* token("quote", squote)
+ token("quote", dquote)
* token(lexer.STRING, (escaped + (1-dquote))^0 )
* token("quote", dquote)
local longstring = token("quote", longonestart)
* token(lexer.STRING, longonestring)
* token("quote", longonestop)
+ token("quote", longtwostart)
* token(lexer.STRING, longtwostring)
* token("quote", longtwostop)
local string = shortstring
+ longstring
local integer = P('-')^-1 * (lexer.hex_num + lexer.dec_num)
local number = token(lexer.NUMBER, lexer.float + integer)
local word = R('AZ','az','__','\127\255') * (lexer.alnum + '_')^0
local identifier = token(lexer.IDENTIFIER, word)
local operator = token(lexer.OPERATOR, P('~=') + S('+-*/%^#=<>;:,.{}[]()')) -- maybe split of {}[]()
local keyword = token(lexer.KEYWORD, word_match(keywords))
local builtin = token(lexer.FUNCTION, word_match(functions))
local constant = token(lexer.CONSTANT, word_match(constants))
local csname = token("user", word_match(csnames)) * (
whitespace^0 * #S("{(")
+ ( whitespace^0 * token(lexer.OPERATOR, P(".")) * whitespace^0 * token("csname",word) )^1
)
_rules = {
{ 'whitespace', whitespace },
{ 'keyword', keyword },
{ 'function', builtin },
{ 'csname', csname },
{ 'constant', constant },
{ 'identifier', identifier },
{ 'string', string },
{ 'comment', comment },
{ 'number', number },
{ 'operator', operator },
{ 'any_char', any_char },
}
_tokenstyles = {
{ "comment", lexer.style_context_comment },
{ "quote", lexer.style_context_quote },
{ "keyword", lexer.style_context_keyword },
{ "user", lexer.style_context_user },
{ "specials", lexer.style_context_specials },
{ "extras", lexer.style_context_extras },
}
_foldsymbols = {
_patterns = {
'%l+',
'[%({%)}%[%]]',
},
[lexer.KEYWORD] = {
['if'] = 1,
['end'] = -1,
['do'] = 1,
['function'] = 1,
['repeat'] = 1,
['until'] = -1,
},
[lexer.COMMENT] = {
['['] = 1, [']'] = -1,
},
["quote"] = { -- to be tested
['['] = 1, [']'] = -1,
},
[lexer.OPERATOR] = {
['('] = 1, [')'] = -1,
['{'] = 1, ['}'] = -1,
},
}
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