1 files changed, 109 insertions, 0 deletions
diff --git a/tex/context/base/syst-lua.lua b/tex/context/base/syst-lua.lua
new file mode 100644
index 000000000..640282953
--- /dev/null
+++ b/tex/context/base/syst-lua.lua
@@ -0,0 +1,109 @@
+if not modules then modules = { } end modules ['syst-lua'] = {
+    version   = 1.001,
+    comment   = "companion to syst-lua.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local texsprint, texprint, texwrite, texiowrite_nl = tex.sprint, tex.print, tex.write, texio.write_nl
+local format, find = string.format, string.find
+local lpegmatch = lpeg.match
+
+local ctxcatcodes = tex.ctxcatcodes
+
+commands = commands or { } cs = commands -- shorter
+
+function commands.writestatus(a,b,c,...)
+    if c then
+        texiowrite_nl(format("%-16s: %s\n",a,format(b,c,...)))
+    else
+        texiowrite_nl(format("%-16s: %s\n",a,b)) -- b can have %'s
+    end
+end
+function commands.writedebug(a,b,c,...)
+    if c then
+        texiowrite_nl(format("%-16s| %s\n",a,format(b,c,...)))
+    else
+        texiowrite_nl(format("%-16s| %s\n",a,b)) -- b can have %'s
+    end
+end
+
+function commands.report(s,t,...)
+    commands.writestatus("!"..s,format(t,...))
+end
+
+local function testcase(b)
+    if b then -- faster with if than with expression
+        texsprint(ctxcatcodes,"\\firstoftwoarguments")
+    else
+        texsprint(ctxcatcodes,"\\secondoftwoarguments")
+    end
+end
+
+commands.testcase = testcase
+commands.doifelse = testcase
+
+function commands.doif(b)
+    if b then
+        texsprint(ctxcatcodes,"\\firstofoneargument")
+    else
+        texsprint(ctxcatcodes,"\\gobbleoneargument")
+    end
+end
+function commands.doifnot(b)
+    if b then
+        texsprint(ctxcatcodes,"\\gobbleoneargument")
+    else
+        texsprint(ctxcatcodes,"\\firstofoneargument")
+    end
+end
+
+function commands.boolcase(b)
+    if b then texwrite(1) else texwrite(0) end
+end
+
+function commands.doifelsespaces(str)
+    return commands.doifelse(find(str,"^ +$"))
+end
+
+local s = lpeg.Ct(lpeg.splitat(","))
+local h = { }
+
+function commands.doifcommonelse(a,b)
+    local ha = h[a]
+    local hb = h[b]
+    if not ha then ha = lpegmatch(s,a) h[a] = ha end
+    if not hb then hb = lpegmatch(s,b) h[b] = hb end
+    for i=1,#ha do
+        for j=1,#hb do
+            if ha[i] == hb[j] then
+                return testcase(true)
+            end
+        end
+    end
+    return testcase(false)
+end
+
+function commands.doifinsetelse(a,b)
+    local hb = h[b]
+    if not hb then hb = lpegmatch(s,b) h[b] = hb end
+    for i=1,#hb do
+        if a == hb[i] then
+            return testcase(true)
+        end
+    end
+    return testcase(false)
+end
+
+function commands. def   (cs,value) texsprint(ctxcatcodes,format( "\\def\\%s{%s}",cs,value)) end
+function commands.edef   (cs,value) texsprint(ctxcatcodes,format("\\edef\\%s{%s}",cs,value)) end
+function commands.gdef   (cs,value) texsprint(ctxcatcodes,format("\\gdef\\%s{%s}",cs,value)) end
+function commands.xdef   (cs,value) texsprint(ctxcatcodes,format("\\xdef\\%s{%s}",cs,value)) end
+function commands.chardef(cs,value) texsprint(ctxcatcodes,format("\\chardef\\%s=%s\\relax",cs,value)) end
+
+local pattern = lpeg.patterns.validdimen
+
+function commands.doifdimenstringelse(str)
+    testcase(lpegmatch(pattern,str))
+end