stable 2010-05-24 13:10

1 files changed, 69 insertions, 0 deletions

diff --git a/tex/context/base/lxml-ent.lua b/tex/context/base/lxml-ent.lua
new file mode 100644
index 000000000..193611937
--- /dev/null
+++ b/tex/context/base/lxml-ent.lua
@@ -0,0 +1,69 @@
+if not modules then modules = { } end modules ['lxml-ent'] = {
+    version   = 1.001,
+    comment   = "this module is the basis for the lxml-* ones",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local type, next, tonumber =  type, next, tonumber
+local texsprint, ctxcatcodes = tex.sprint, tex.ctxcatcodes
+local utf = unicode.utf8
+local byte, format = string.byte, string.format
+local utfupper, utfchar = utf.upper, utf.char
+local lpegmatch = lpeg.match
+
+--[[ldx--
+<p>We provide (at least here) two entity handlers. The more extensive
+resolver consults a hash first, tries to convert to <l n='utf'/> next,
+and finaly calls a handler when defines. When this all fails, the
+original entity is returned.</p>
+
+<p>We do things different now but it's still somewhat experimental</p>
+--ldx]]--
+
+local trace_entities = false  trackers.register("xml.entities", function(v) trace_entities = v end)
+
+xml.entities = xml.entities or { } -- xml.entity_handler == function
+
+storage.register("xml/entities",xml.entities,"xml.entities") -- this will move to lxml
+
+local entities = xml.entities -- this is a shared hash
+
+xml.unknown_any_entity_format = nil -- has to be per xml
+
+local parsedentity = xml.parsedentitylpeg
+
+function xml.register_entity(key,value)
+    entities[key] = value
+    if trace_entities then
+        logs.report("xml","registering entity '%s' as: %s",key,value)
+    end
+end
+
+function xml.resolved_entity(str)
+    local e = entities[str]
+    if e then
+        local te = type(e)
+        if te == "function" then
+            e(str)
+        elseif e then
+            texsprint(ctxcatcodes,e)
+        end
+    else
+        -- resolve hex and dec, todo: escape # & etc for ctxcatcodes
+        -- normally this is already solved while loading the file
+        local chr, err = lpegmatch(parsedentity,str)
+        if chr then
+            texsprint(ctxcatcodes,chr)
+        elseif err then
+            texsprint(ctxcatcodes,err)
+        else
+            texsprint(ctxcatcodes,"\\xmle{",str,"}{",utfupper(str),"}") -- we need to use our own upper
+        end
+    end
+end
+
+entities.amp = function() tex.write("&") end
+entities.lt  = function() tex.write("<") end
+entities.gt  = function() tex.write(">") end