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local info = {
version = 1.002,
comment = "scintilla lpeg lexer for metafun",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- adapted from the regular context pretty printer code (after all, lexing
-- boils down to much of the same and there are only so many ways to do
-- things). Simplified a bit as we have a different nesting model.
-- todo: parse entities in attributes
local lexer = lexer
local global, string, table, lpeg = _G, string, table, lpeg
local token, style, colors, exact_match, no_style = lexer.token, lexer.style, lexer.colors, lexer.exact_match, lexer.style_nothing
local P, R, S, V, C, Cmt = lpeg.P, lpeg.R, lpeg.S, lpeg.V, lpeg.C, lpeg.Cmt
local type, setmetatable = type, setmetatable
local match, find = string.match, string.find
module(...)
local examplelexer = _M
local whitespace = examplelexer.WHITESPACE -- triggers states
local space = lexer.space -- S(" \t\n\r\v\f")
local any = lexer.any -- P(1)
local dquote = P('"')
local squote = P("'")
local colon = P(":")
local semicolon = P(";")
local equal = P("=")
local ampersand = P("&")
local name = (R("az","AZ","09") + S('_-.'))^1
local openbegin = P("<")
local openend = P("</")
local closebegin = P("/>") + P(">")
local closeend = P(">")
local opencomment = P("<!--")
local closecomment = P("-->")
local openinstruction = P("<?")
local closeinstruction = P("?>")
local opencdata = P("<![CDATA[")
local closecdata = P("]]>")
local entity = ampersand * (1-semicolon)^1 * semicolon
local wordpattern = lexer.context.wordpattern
local checkedword = lexer.context.checkedword
local setwordlist = lexer.context.setwordlist
local validwords = false
-- <?xml version="1.0" encoding="UTF-8" language="uk" ?>
--
-- <?context-xml-directive editor language us ?>
local p_preamble = Cmt(#P("<?xml "), function(input,i,_) -- todo: utf bomb
if i < 10 then
validwords = false
local language = match(input,"^<%?xml[^>]*%?>%s*<%?context%-xml%-directive%s+editor%s+language%s+(..)%s+%?>")
if not language then
language = match(input,'^<%?xml[^>]*language=[\"\'](..)[\"\'][^>]*%?>',i)
end
if language then
validwords = setwordlist(language)
end
end
return false
end)
local p_word =
Cmt(wordpattern, function(_,i,s)
if validwords then
return checkedword(validwords,s,i)
else
return true, { "text", i }
end
end)
local p_rest =
token("default", any)
local p_text =
token("default", (1-S("<>&")-space)^1)
local p_spacing =
token(whitespace, space^1)
local p_optionalwhitespace =
p_spacing^0
local p_localspacing =
token("default", space^1)
-- Because we want a differently colored open and close we need an embedded lexer (whitespace
-- trigger). What is actually needed is that scintilla applies the current whitespace style.
-- Even using different style keys is not robust as they can be shared. I'll fix the main
-- lexer code.
local p_sstring =
token("quote",dquote)
* token("string",(1-dquote)^0) -- different from context
* token("quote",dquote)
local p_dstring =
token("quote",squote)
* token("string",(1-squote)^0) -- different from context
* token("quote",squote)
-- local p_comment =
-- token("command",opencomment)
-- * token("comment",(1-closecomment)^0) -- different from context
-- * token("command",closecomment)
-- local p_cdata =
-- token("command",opencdata)
-- * token("comment",(1-closecdata)^0) -- different from context
-- * token("command",closecdata)
local commentlexer = lexer.load("scite-context-lexer-xml-comment")
local cdatalexer = lexer.load("scite-context-lexer-xml-cdata")
lexer.embed_lexer(examplelexer, commentlexer, token("command",opencomment), token("command",closecomment))
lexer.embed_lexer(examplelexer, cdatalexer, token("command",opencdata), token("command",closecdata))
-- maybe cdata just text (then we don't need the extra lexer as we only have one comment then)
local p_name =
token("plain",name)
* (
token("default",colon)
* token("keyword",name)
)^1
+ token("keyword",name)
local p_key = p_name
local p_attributes = (
p_optionalwhitespace
* p_key
* p_optionalwhitespace
* token("plain",equal)
* p_optionalwhitespace
* (p_dstring + p_sstring)
* p_optionalwhitespace
)^0
local p_open =
token("keyword",openbegin)
* p_name
* p_optionalwhitespace
* p_attributes
* token("keyword",closebegin)
local p_close =
token("keyword",openend)
* p_name
* p_optionalwhitespace
* token("keyword",closeend)
local p_entity =
token("constant",entity)
local p_instruction =
token("command",openinstruction * P("xml"))
* p_optionalwhitespace
* p_attributes
* p_optionalwhitespace
* token("command",closeinstruction)
+ token("command",openinstruction * name)
* token("default",(1-closeinstruction)^1)
* token("command",closeinstruction)
_rules = {
{ "whitespace", p_spacing },
{ "preamble", p_preamble },
{ "word", p_word },
-- { "text", p_text },
-- { "comment", p_comment },
-- { "cdata", p_cdata },
{ "instruction", p_instruction },
{ "close", p_close },
{ "open", p_open },
{ "entity", p_entity },
{ "rest", p_rest },
}
_tokenstyles = lexer.context.styleset
_foldsymbols = { -- somehow doesn't work yet
_patterns = {
"[<>]",
},
["keyword"] = {
["<"] = 1, [">"] = -1,
},
}
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