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local info = {
version = 1.002,
comment = "scintilla lpeg lexer for pdf",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- pdf is normally startic .. i.e. not edited so we don't really
-- need embedded lexers.
local P, R, S, V = lpeg.P, lpeg.R, lpeg.S, lpeg.V
local lexer = require("lexer")
local context = lexer.context
local patterns = context.patterns
local token = lexer.token
local pdflexer = lexer.new("pdf","scite-context-lexer-pdf")
local whitespace = pdflexer.whitespace
----- pdfobjectlexer = lexer.load("scite-context-lexer-pdf-object")
----- pdfxreflexer = lexer.load("scite-context-lexer-pdf-xref")
local anything = patterns.anything
local space = patterns.space
local spacing = patterns.spacing
local nospacing = patterns.nospacing
local anything = patterns.anything
local restofline = patterns.restofline
local t_whitespace = token(whitespace, spacing)
local t_spacing = token("default", spacing)
----- t_rest = token("default", nospacing)
local t_rest = token("default", anything)
local p_comment = P("%") * restofline
local t_comment = token("comment", p_comment)
-- whatever
local space = patterns.space
local spacing = patterns.spacing
local nospacing = patterns.nospacing
local anything = patterns.anything
local newline = patterns.eol
local real = patterns.real
local cardinal = patterns.cardinal
local alpha = patterns.alpha
local lparent = P("(")
local rparent = P(")")
local langle = P("<")
local rangle = P(">")
local escape = P("\\")
local unicodetrigger = P("feff")
local nametoken = 1 - space - S("<>/[]()")
local name = P("/") * nametoken^1
local p_string = P { ( escape * anything + lparent * V(1) * rparent + (1 - rparent) )^0 }
local t_spacing = token("default", spacing)
local t_spaces = token("default", spacing)^0
local t_rest = token("default", nospacing) -- anything
local p_stream = P("stream")
local p_endstream = P("endstream")
local p_obj = P("obj")
local p_endobj = P("endobj")
local p_reference = P("R")
local p_objectnumber = patterns.cardinal
local p_comment = P("%") * (1-S("\n\r"))^0
local t_string = token("quote", lparent)
* token("string", p_string)
* token("quote", rparent)
local t_unicode = token("quote", langle)
* token("plain", unicodetrigger)
* token("string", (1-rangle)^1)
* token("quote", rangle)
local t_whatsit = token("quote", langle)
* token("string", (1-rangle)^1)
* token("quote", rangle)
local t_keyword = token("command", name)
local t_constant = token("constant", name)
local t_number = token("number", real)
-- t_reference = token("number", cardinal)
-- * t_spacing
-- * token("number", cardinal)
local t_reserved = token("number", P("true") + P("false") + P("NULL"))
-- t_reference = token("warning", cardinal * spacing * cardinal * spacing)
-- * token("keyword", p_reference)
local t_reference = token("warning", cardinal)
* t_spacing
* token("warning", cardinal)
* t_spacing
* token("keyword", p_reference)
local t_comment = token("comment", p_comment)
local t_openobject = token("warning", p_objectnumber)
* t_spacing
* token("warning", p_objectnumber)
* t_spacing
* token("keyword", p_obj)
-- t_openobject = token("warning", p_objectnumber * spacing)
-- * token("warning", p_objectnumber * spacing)
-- * token("keyword", p_obj)
local t_closeobject = token("keyword", p_endobj)
local t_opendictionary = token("grouping", P("<<"))
local t_closedictionary = token("grouping", P(">>"))
local t_openarray = token("grouping", P("["))
local t_closearray = token("grouping", P("]"))
local t_stream = token("keyword", p_stream)
* token("text", (1 - p_endstream)^1)
* token("keyword", p_endstream)
local t_dictionary = { "dictionary",
dictionary = t_opendictionary * (t_spaces * t_keyword * t_spaces * V("whatever"))^0 * t_spaces * t_closedictionary,
array = t_openarray * (t_spaces * V("whatever"))^0 * t_spaces * t_closearray,
whatever = V("dictionary") + V("array") + t_constant + t_reference + t_string + t_unicode + t_number + t_reserved + t_whatsit,
}
local t_object = { "object", -- weird that we need to catch the end here (probably otherwise an invalid lpeg)
dictionary = t_dictionary.dictionary,
array = t_dictionary.array,
whatever = t_dictionary.whatever,
object = t_openobject * t_spaces * (V("dictionary")^-1 * t_spaces * t_stream^-1 + V("array") + V("number") + t_spaces) * t_spaces * t_closeobject,
number = t_number,
}
-- objects ... sometimes NUL characters play havoc ... and in xref we have
-- issues with embedded lexers that have spaces in the start and stop
-- conditions and this cannot be handled well either ... so, an imperfect
-- solution ... but anyway, there is not that much that can end up in
-- the root of the tree see we're sort of safe
local p_trailer = P("trailer")
local t_trailer = token("keyword", p_trailer)
* t_spacing
* t_dictionary
-- t_trailer = token("keyword", p_trailer * spacing)
-- * t_dictionary
local p_startxref = P("startxref")
local t_startxref = token("keyword", p_startxref)
* t_spacing
* token("number", cardinal)
-- t_startxref = token("keyword", p_startxref * spacing)
-- * token("number", cardinal)
local p_xref = P("xref")
local t_xref = token("keyword",p_xref)
* t_spacing
* token("number", cardinal)
* t_spacing
* token("number", cardinal)
* spacing
-- t_xref = token("keyword",p_xref)
-- * token("number", spacing * cardinal * spacing * cardinal * spacing)
local t_number = token("number", cardinal)
* t_spacing
* token("number", cardinal)
* t_spacing
* token("keyword", S("fn"))
-- t_number = token("number", cardinal * spacing * cardinal * spacing)
-- * token("keyword", S("fn"))
pdflexer._rules = {
{ "whitespace", t_whitespace },
{ "object", t_object },
{ "comment", t_comment },
{ "trailer", t_trailer },
{ "startxref", t_startxref },
{ "xref", t_xref },
{ "number", t_number },
{ "rest", t_rest },
}
pdflexer._tokenstyles = context.styleset
-- lexer.inspect(pdflexer)
-- collapser: obj endobj stream endstream
pdflexer._foldpattern = p_obj + p_endobj + p_stream + p_endstream
pdflexer._foldsymbols = {
["keyword"] = {
["obj"] = 1,
["endobj"] = -1,
["stream"] = 1,
["endstream"] = -1,
},
}
return pdflexer
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