1 files changed, 92 insertions, 0 deletions
diff --git a/tex/context/base/x-css.lua b/tex/context/base/x-css.lua
new file mode 100644
index 000000000..da21fd21b
--- /dev/null
+++ b/tex/context/base/x-css.lua
@@ -0,0 +1,92 @@
+if not modules then modules = { } end modules ['lxml-css'] = {
+    version   = 1.001,
+    comment   = "companion to lxml-css.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local tonumber = tonumber
+local P, S, C, R, Cb, Cg, Carg = lpeg.P, lpeg.S, lpeg.C, lpeg.R, lpeg.Cb, lpeg.Cg, lpeg.Carg
+local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
+
+local css        = { }
+local moduledata = moduledata or { }
+moduledata.css   = css
+
+local dimenfactors = number.dimenfactors
+
+local bpf, cmf, mmf, inf = 1/dimenfactors.bp, 1/dimenfactors.cm, 1/dimenfactors.mm, 1/dimenfactors["in"]
+
+local validdimen = Cg(lpegpatterns.number,'a') * (
+        Cb('a') * P("pt")           / function(s)     return tonumber(s) * bpf end
+      + Cb('a') * P("cm")           / function(s)     return tonumber(s) * cmf end
+      + Cb('a') * P("mm")           / function(s)     return tonumber(s) * mmf end
+      + Cb('a') * P("in")           / function(s)     return tonumber(s) * inf end
+      + Cb('a') * P("px") * Carg(1) / function(s,pxf) return tonumber(s) * pxf end
+      + Cb('a') * P("%")  * Carg(2) / function(s,pcf) return tonumber(s) * pcf end
+      + Cb('a') * P("ex") * Carg(3) / function(s,exf) return tonumber(s) * exf end
+      + Cb('a') * P("em") * Carg(4) / function(s,emf) return tonumber(s) * emf end
+      + Cb('a')           * Carg(1) / function(s,pxf) return tonumber(s) * pxf end
+    )
+
+local pattern = (validdimen * lpegpatterns.whitespace^0)^1
+
+-- todo: default if ""
+
+local function padding(str,pixel,percent,exheight,emwidth)
+    local top, bottom, left, right = lpegmatch(pattern,str,1,pixel,percent,exheight,emwidth)
+    if not bottom then
+        bottom, left, right = top, top, top
+    elseif not left then
+        bottom, left, right = top, bottom, bottom
+    elseif not right then
+        bottom, left, right = left, bottom, bottom
+    end
+    return top, bottom, left, right
+end
+
+css.padding = padding
+
+-- local hsize    = 655360*100
+-- local exheight = 65536*4
+-- local emwidth  = 65536*10
+-- local pixel    = emwidth/100
+--
+-- print(padding("10px",pixel,hsize,exheight,emwidth))
+-- print(padding("10px 20px",pixel,hsize,exheight,emwidth))
+-- print(padding("10px 20px 30px",pixel,hsize,exheight,emwidth))
+-- print(padding("10px 20px 30px 40px",pixel,hsize,exheight,emwidth))
+--
+-- print(padding("10%",pixel,hsize,exheight,emwidth))
+-- print(padding("10% 20%",pixel,hsize,exheight,emwidth))
+-- print(padding("10% 20% 30%",pixel,hsize,exheight,emwidth))
+-- print(padding("10% 20% 30% 40%",pixel,hsize,exheight,emwidth))
+--
+-- print(padding("10",pixel,hsize,exheight,emwidth))
+-- print(padding("10 20",pixel,hsize,exheight,emwidth))
+-- print(padding("10 20 30",pixel,hsize,exheight,emwidth))
+-- print(padding("10 20 30 40",pixel,hsize,exheight,emwidth))
+--
+-- print(padding("10pt",pixel,hsize,exheight,emwidth))
+-- print(padding("10pt 20pt",pixel,hsize,exheight,emwidth))
+-- print(padding("10pt 20pt 30pt",pixel,hsize,exheight,emwidth))
+-- print(padding("10pt 20pt 30pt 40pt",pixel,hsize,exheight,emwidth))
+
+local fontidentifiers = fonts.identifiers
+local currentfont = font.current
+local texdimen = tex.dimen
+
+local function padding(str)
+    local fnt = fontidentifiers[currentfont()]
+    local exheight = fnt.ex_height
+    local emwidth  = fnt.quad
+    local hsize    = texdimen.hsize/100
+    local pixel    = emwidth/100
+    return padding(str,pixel,hsize,exheight,emwidth)
+end
+
+--~ function css.simplepadding(str)
+--~     context("%ssp",padding(str,pixel,hsize,exheight,emwidth))
+--~ end
+