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-rw-r--r--Master/texmf-dist/tex/context/base/core-env.lua101
1 files changed, 101 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/core-env.lua b/Master/texmf-dist/tex/context/base/core-env.lua
new file mode 100644
index 00000000000..694b2f07c42
--- /dev/null
+++ b/Master/texmf-dist/tex/context/base/core-env.lua
@@ -0,0 +1,101 @@
+if not modules then modules = { } end modules ['core-env'] = {
+ version = 1.001,
+ comment = "companion to core-env.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+-- maybe this will move to the context name space although the
+-- plurals are unlikely to clash with future tex primitives
+--
+-- if tex.modes['xxxx'] then .... else .... end
+
+local P, C, S, Cc, lpegmatch, patterns = lpeg.P, lpeg.C, lpeg.S, lpeg.Cc, lpeg.match, lpeg.patterns
+
+local csname_id = token.csname_id
+local texcount = tex.count
+local create = token.create
+
+local allocate = utilities.storage.allocate
+local setmetatableindex = table.setmetatableindex
+
+local undefined = csname_id("*undefined*crap*")
+local iftrue = create("iftrue")[2] -- inefficient hack
+
+tex.modes = allocate { }
+tex.systemmodes = allocate { }
+tex.constants = allocate { }
+tex.conditionals = allocate { }
+tex.ifs = allocate { }
+
+local modes = { }
+local systemmodes = { }
+
+setmetatableindex(tex.modes, function(t,k)
+ local m = modes[k]
+ if m then
+ return m()
+ else
+ local n = "mode" .. k
+ if csname_id(n) == undefined then
+ return false
+ else
+ modes[k] = function() return texcount[n] >= 1 end
+ return texcount[n] >= 1
+ end
+ end
+end)
+
+setmetatableindex(tex.systemmodes, function(t,k)
+ local m = systemmodes[k]
+ if m then
+ return m()
+ else
+ local n = "mode*" .. k
+ if csname_id(n) == undefined then
+ return false
+ else
+ systemmodes[k] = function() return texcount[n] >= 1 end
+ return texcount[n] >= 1
+ end
+ end
+end)
+
+setmetatableindex(tex.constants, function(t,k)
+ return csname_id(k) ~= undefined and texcount[k] or 0
+end)
+
+setmetatableindex(tex.conditionals, function(t,k) -- 0 == true
+ return csname_id(k) ~= undefined and texcount[k] == 0
+end)
+
+setmetatableindex(tex.ifs, function(t,k)
+ return csname_id(k) ~= undefined and create(k)[2] == iftrue -- inefficient, this create, we need a helper
+end)
+
+function tex.settrue(name)
+ texcount[name] = 0
+end
+
+function tex.setfalse(name)
+ texcount[name] = 1
+end
+
+---- arg = P("{") * C(patterns.nested) * P("}") + Cc("")
+
+local sep = S("), ")
+local str = C((1-sep)^1)
+local tag = P("(") * C((1-S(")" ))^1) * P(")")
+local arg = P("(") * C((1-S("){"))^1) * P("{") * C((1-P("}"))^0) * P("}") * P(")")
+
+local pattern = (
+ P("lua") * tag / context.luasetup
+ + P("xml") * arg / context.setupwithargument -- or xmlw as xmlsetup has swapped arguments
+ + (P("tex") * tag + str) / context.texsetup
+ + sep^1
+)^1
+
+function commands.autosetups(str)
+ lpegmatch(pattern,str)
+end