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if not modules then modules = { } end modules ['cldf-bas'] = {
version = 1.001,
comment = "companion to cldf-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local lpegmatch, patterns = lpeg.match, lpeg.patterns
local P, R, V, Cc, Cs = lpeg.P, lpeg.R, lpeg.V, lpeg.Cc, lpeg.Cs
local format = string.format
local cpatterns = patterns.context or { }
patterns.context = cpatterns
local backslash = P("\\")
local csname = backslash * P(1) * (1-backslash)^0
local sign = P("+") / "\\textplus "
+ P("-") / "\\textminus "
local leftbrace = P("{")
local rightbrace = P("}")
local nested = P { leftbrace * (V(1) + (1-rightbrace))^0 * rightbrace }
local subscript = P("_")
local superscript = P("^")
local utf8char = patterns.utf8char
local cardinal = patterns.cardinal
-- local scripts = P { "start",
-- start = V("csname") + V("lowfirst") + V("highfirst"),
-- csname = csname,
-- content = Cs(V("csname") + nested + sign^-1 * (cardinal + utf8char)),
-- lowfirst = subscript * ( Cc("\\lohi{%s}{%s}") * V("content") * superscript + Cc("\\low{%s}" ) ) * V("content") / format,
-- highfirst = superscript * ( Cc("\\hilo{%s}{%s}") * V("content") * subscript + Cc("\\high{%s}") ) * V("content") / format,
-- }
local scripts = P { "start",
start = V("csname") + V("lowfirst") + V("highfirst"),
csname = csname,
content = Cs(V("csname") + nested + sign^-1 * (cardinal + utf8char)),
lowfirst = (subscript /"") * ( Cc("\\lohi{") * V("content") * Cc("}{") * (superscript/"") + Cc("\\low{" ) ) * V("content") * Cc("}"),
highfirst = (superscript/"") * ( Cc("\\hilo{") * V("content") * Cc("}{") * (subscript /"") + Cc("\\high{") ) * V("content") * Cc("}"),
}
local scripted = Cs((csname + scripts + utf8char)^0)
cpatterns.scripts = scripts
cpatterns.csname = csname
cpatterns.scripted = scripted
cpatterns.nested = nested
-- inspect(scripted)
-- print(lpegmatch(scripted,"10^-3_x"))
-- print(lpegmatch(scripted,"10^-a"))
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