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if not modules then modules = { } end modules ['strc-rsc'] = {
version = 1.001,
comment = "companion to strc-ref.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- The scanner is in a separate module so that we can test without too
-- many dependencies.
-- The scanner accepts nested outer, but we don't care too much, maybe
-- some day we will have both but currently the innermost wins.
local lpegmatch, lpegP, lpegS, lpegCs, lpegCt, lpegCf, lpegCc, lpegC, lpegCg = lpeg.match, lpeg.P, lpeg.S, lpeg.Cs, lpeg.Ct, lpeg.Cf, lpeg.Cc, lpeg.C, lpeg.Cg
local find = string.find
local spaces = lpegP(" ")^0
local lparent = lpegP("(")
local rparent = lpegP(")")
local lbrace = lpegP("{")
local rbrace = lpegP("}")
local tcolon = lpegP(":::") -- component or outer
local dcolon = lpegP("::") -- outer
local scolon = lpegP(":") -- prefix
local backslash = lpegP("\\")
lparent = spaces * lparent * spaces
rparent = spaces * rparent * spaces
lbrace = spaces * lbrace * spaces
rbrace = spaces * rbrace * spaces
tcolon = spaces * tcolon * spaces
dcolon = spaces * dcolon * spaces
local endofall = spaces * lpegP(-1)
local o_token = 1 - rparent - rbrace - lparent - lbrace -- can be made more efficient
local a_token = 1 - rbrace
local s_token = 1 - lparent - lbrace
local i_token = 1 - lparent - lbrace - endofall
local f_token = 1 - lparent - lbrace - dcolon
local c_token = 1 - lparent - lbrace - tcolon
local hastexcode = lpegCg(lpegCc("has_tex") * lpegCc(true)) -- cannot be made to work
local component = lpegCg(lpegCc("component") * lpegCs(c_token^1))
local outer = lpegCg(lpegCc("outer") * lpegCs(f_token^1))
local operation = lpegCg(lpegCc("operation") * lpegCs(o_token^1))
local arguments = lpegCg(lpegCc("arguments") * lpegCs(a_token^0))
local special = lpegCg(lpegCc("special") * lpegCs(s_token^1))
local inner = lpegCg(lpegCc("inner") * lpegCs(i_token^1))
arguments = (lbrace * arguments * rbrace)^-1
component = component * tcolon
outer = outer * dcolon
operation = outer^-1 * operation -- special case: page(file::1) and file::page(1)
inner = inner * arguments
special = special * lparent * (operation * arguments)^-1 * rparent
local referencesplitter = spaces * lpegCf (lpegCt("") * (component + outer)^-1 * (special + inner)^-1 * endofall, rawset)
local prefixsplitter = lpegCs(lpegP((1-scolon)^1 * scolon)) * #-scolon * lpegCs(lpegP(1)^1)
local componentsplitter = lpegCs(lpegP((1-scolon)^1)) * scolon * #-scolon * lpegCs(lpegP(1)^1)
prefixsplitter = componentsplitter
local function splitreference(str)
if str and str ~= "" then
local t = lpegmatch(referencesplitter,str)
if t then
local a = t.arguments
if a and find(a,"\\",1,true) then
t.has_tex = true
else
local o = t.arguments
if o and find(o,"\\",1,true) then
t.has_tex = true
end
end
return t
end
end
end
local function splitprefix(str)
return lpegmatch(prefixsplitter,str)
end
local function splitcomponent(str)
return lpegmatch(componentsplitter,str)
end
-- register in the right namespace
structures = structures or { }
structures.references = structures.references or { }
local references = structures.references
references.referencesplitter = referencesplitter
references.splitreference = splitreference
references.prefixsplitter = prefixsplitter
references.splitprefix = splitprefix
references.componentsplitter = componentsplitter
references.splitcomponent = splitcomponent
-- test code:
-- inspect(splitreference([[component:::inner]]))
-- inspect(splitprefix([[component:::inner]]))
-- inspect(splitprefix([[component:inner]]))
-- inspect(splitreference([[ ]]))
-- inspect(splitreference([[ inner ]]))
-- inspect(splitreference([[ special ( operation { argument, argument } ) ]]))
-- inspect(splitreference([[ special ( operation { argument } ) ]]))
-- inspect(splitreference([[ special ( operation { argument, \argument } ) ]]))
-- inspect(splitreference([[ special ( operation { \argument } ) ]]))
-- inspect(splitreference([[ special ( operation ) ]]))
-- inspect(splitreference([[ special ( \operation ) ]]))
-- inspect(splitreference([[ special ( o\peration ) ]]))
-- inspect(splitreference([[ special ( ) ]]))
-- inspect(splitreference([[ inner { argument } ]]))
-- inspect(splitreference([[ inner { \argument } ]]))
-- inspect(splitreference([[ inner { ar\gument } ]]))
-- inspect(splitreference([[inner{a\rgument}]]))
-- inspect(splitreference([[ inner { argument, argument } ]]))
-- inspect(splitreference([[ inner { argument, \argument } ]])) -- fails: bug in lpeg?
-- inspect(splitreference([[ inner { \argument, \argument } ]]))
-- inspect(splitreference([[ outer :: ]]))
-- inspect(splitreference([[ outer :: inner]]))
-- inspect(splitreference([[ outer :: special (operation { argument,argument } ) ]]))
-- inspect(splitreference([[ outer :: special (operation { } )]]))
-- inspect(splitreference([[ outer :: special ( operation { argument, \argument } ) ]]))
-- inspect(splitreference([[ outer :: special ( operation ) ]]))
-- inspect(splitreference([[ outer :: special ( \operation ) ]]))
-- inspect(splitreference([[ outer :: special ( ) ]]))
-- inspect(splitreference([[ outer :: inner { argument } ]]))
-- inspect(splitreference([[ special ( outer :: operation ) ]]))
-- inspect(splitreference([[]]))
-- inspect(splitreference([[inner]]))
-- inspect(splitreference([[special(operation{argument,argument})]]))
-- inspect(splitreference([[special(operation)]]))
-- inspect(splitreference([[special(\operation)]]))
-- inspect(splitreference([[special()]]))
-- inspect(splitreference([[inner{argument}]]))
-- inspect(splitreference([[inner{\argument}]]))
-- inspect(splitreference([[outer::]]))
-- inspect(splitreference([[outer::inner]]))
-- inspect(splitreference([[outer::special(operation{argument,argument})]]))
-- inspect(splitreference([[outer::special(operation{argument,\argument})]]))
-- inspect(splitreference([[outer::special(operation)]]))
-- inspect(splitreference([[outer::special(\operation)]]))
-- inspect(splitreference([[outer::special()]]))
-- inspect(splitreference([[outer::inner{argument}]]))
-- inspect(splitreference([[special(outer::operation)]]))
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