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if not modules then modules = { } end modules ['l-macros'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is actually rather old code that I made as a demo for Luigi but that
-- now comes in handy when we switch to Lua 5.3. The reason for using it (in
-- in transition) is that we cannot mix 5.3 bit operators in files that get
-- loaded in 5.2 (parsing happens before conditional testing).
local S, P, R, V, C, Cs, Cc, Ct, Carg = lpeg.S, lpeg.P, lpeg.R, lpeg.V, lpeg.C, lpeg.Cs, lpeg.Cc, lpeg.Ct, lpeg.Carg
local lpegmatch = lpeg.match
local concat = table.concat
local next = next
local newline = S("\n\r")^1
local continue = P("\\") * newline
local spaces = S(" \t") + continue
local name = R("az","AZ","__","09")^1
local body = ((1+continue/"")-newline)^1
local lparent = P("(")
local rparent = P(")")
local noparent = 1 - (lparent + rparent)
local nested = P { lparent * (noparent + V(1))^0 * rparent }
local escaped = P("\\") * P(1)
local squote = P("'")
local dquote = P('"')
local quoted = dquote * (escaped + (1-dquote))^0 * dquote
+ squote * (escaped + (1-squote))^0 * squote
local arguments = lparent * Ct((Cs((nested+(quoted + 1 - S("),")))^1) + S(", "))^0) * rparent
local macros = lua.macros or { }
lua.macros = macros
local patterns = { }
local definitions = { }
local resolve
local subparser
-- todo: zero case
resolve = C(C(name) * arguments^-1) / function(raw,s,a)
local d = definitions[s]
if d then
if a then
local n = #a
local p = patterns[s][n]
if p then
local d = d[n]
for i=1,n do
a[i] = lpegmatch(subparser,a[i]) or a[i]
end
return lpegmatch(p,d,1,a) or d
else
return raw
end
else
return d[0] or raw
end
elseif a then
for i=1,#a do
a[i] = lpegmatch(subparser,a[i]) or a[i]
end
return s .. "(" .. concat(a,",") .. ")"
else
return raw
end
end
subparser = Cs((resolve + P(1))^1)
local enddefine = P("#enddefine") / ""
local beginregister = (C(name) * spaces^0 * (arguments + Cc(false)) * C((1-enddefine)^1) * enddefine) / function(k,a,v)
local n = 0
if a then
n = #a
local pattern = P(false)
for i=1,n do
pattern = pattern + (P(a[i]) * Carg(1)) / function(t) return t[i] end
end
pattern = Cs((pattern + P(1))^1)
local p = patterns[k]
if not p then
p = { [0] = false, false, false, false, false, false, false, false, false }
patterns[k] = p
end
p[n] = pattern
end
local d = definitions[k]
if not d then
d = { [0] = false, false, false, false, false, false, false, false, false }
definitions[k] = d
end
d[n] = lpegmatch(subparser,v) or v
return ""
end
local register = (C(name) * spaces^0 * (arguments + Cc(false)) * spaces^0 * C(body)) / function(k,a,v)
local n = 0
if a then
n = #a
local pattern = P(false)
for i=1,n do
pattern = pattern + (P(a[i]) * Carg(1)) / function(t) return t[i] end
end
pattern = Cs((pattern + P(1))^1)
local p = patterns[k]
if not p then
p = { [0] = false, false, false, false, false, false, false, false, false }
patterns[k] = p
end
p[n] = pattern
end
local d = definitions[k]
if not d then
d = { [0] = false, false, false, false, false, false, false, false, false }
definitions[k] = d
end
d[n] = lpegmatch(subparser,v) or v
return ""
end
local unregister = (C(name) * spaces^0 * (arguments + Cc(false))) / function(k,a)
local n = 0
if a then
n = #a
local p = patterns[k]
if p then
p[n] = false
end
end
local d = definitions[k]
if d then
d[n] = false
end
return ""
end
local begindefine = (P("begindefine") * spaces^0 / "") * beginregister
local define = (P("define" ) * spaces^0 / "") * register
local undefine = (P("undefine" ) * spaces^0 / "") * unregister
local parser = Cs( ( ( (P("#")/"") * (define + begindefine + undefine) * (newline^0/"") ) + resolve + P(1) )^0 )
function macros.reset()
definitions = { }
patterns = { }
end
function macros.resolvestring(str)
return lpegmatch(parser,str) or str
end
function macros.resolving()
return next(patterns)
end
-- local str = [[
-- #define check(p,q) (p ~= 0) and (p > q)
--
-- #define oeps a > 10
--
-- #define whatever oeps
--
-- if whatever and check(1,2) then print("!") end
-- if whatever and check(1,3) then print("!") end
-- if whatever and check(1,4) then print("!") end
-- if whatever and check(1,5) then print("!") end
-- if whatever and check(1,6) then print("!") end
-- if whatever and check(1,7) then print("!") end
-- ]]
--
-- print(macros.resolvestring(str))
--
-- macros.resolvestring(io.loaddata("mymacros.lua"))
-- loadstring(macros.resolvestring(io.loaddata("mytestcode.lua")))
-- local luamacros = [[
-- #begindefine setnodecodes
-- local nodecodes = nodes.codes
-- local hlist_code = nodecodes.hlist
-- local vlist_code = nodecodes.vlist
-- local glyph_code = nodecodes.glyph
-- #enddefine
--
-- #define hlist(id) id == hlist_code
-- #define vlist(id) id == vlist_code
-- #define glyph(id) id == glyph_code
-- ]]
--
-- local luacode = [[
-- setnodecodes
--
-- if hlist(id) or vlist(id) then
-- print("we have a list")
-- elseif glyph(id) then
-- print("we have a glyph")
-- else
-- print("i'm stymied")
-- end
--
-- local z = band(0x23,x)
-- local z = btest(0x23,x)
-- local z = rshift(0x23,x)
-- local z = lshift(0x23,x)
-- ]]
--
-- require("l-macros-test-001")
--
-- macros.resolvestring(luamacros)
--
-- local newcode = macros.resolvestring(luacode)
--
-- print(newcode)
--
-- macros.reset()
-- local d = io.loaddata("t:/sources/font-otr.lua")
-- local n = macros.resolvestring(d)
-- io.savedata("r:/tmp/o.lua",n)
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