2016-01-12 16:26:00

1 files changed, 119 insertions, 0 deletions

diff --git a/tex/context/base/mkiv/page-ins.lua b/tex/context/base/mkiv/page-ins.lua
new file mode 100644
index 000000000..235f586c6
--- /dev/null
+++ b/tex/context/base/mkiv/page-ins.lua
@@ -0,0 +1,119 @@
+if not modules then modules = { } end modules ['page-ins'] = {
+    version   = 1.001,
+    comment   = "companion to page-mix.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files",
+}
+
+local next = next
+
+structures           = structures or { }
+structures.inserts   = structures.inserts or { }
+local inserts        = structures.inserts
+
+local report_inserts = logs.reporter("inserts")
+
+local allocate       = utilities.storage.allocate
+
+inserts.stored       = inserts.stored or allocate { } -- combining them in one is inefficient in the
+inserts.data         = inserts.data   or allocate { } -- bytecode storage pool
+
+local variables      = interfaces.variables
+local v_page         = variables.page
+local v_columns      = variables.columns
+local v_firstcolumn  = variables.firstcolumn
+local v_lastcolumn   = variables.lastcolumn
+local v_text         = variables.text
+
+local context        = context
+local implement      = interfaces.implement
+
+storage.register("structures/inserts/stored", inserts.stored, "structures.inserts.stored")
+
+local data           = inserts.data
+local stored         = inserts.stored
+
+for name, specification in next, stored do
+    data[specification.number] = specification
+    data[name]                 = specification
+end
+
+function inserts.define(name,specification)
+    specification.name= name
+    local number = specification.number or 0
+    data[name]   = specification
+    data[number] = specification
+    -- only needed at runtime as this get stored in a bytecode register
+    stored[name] = specification
+    if not specification.location then
+        specification.location = v_page
+    end
+    return specification
+end
+
+function inserts.setup(name,settings)
+    local specification = data[name]
+    for k, v in next, settings do
+        -- maybe trace change
+        specification[k] = v
+    end
+    return specification
+end
+
+function inserts.setlocation(name,location) -- a practical fast one
+    data[name].location = location
+end
+
+function inserts.getlocation(name,location)
+    return data[name].location or v_page
+end
+
+function inserts.getdata(name) -- or number
+    return data[name]
+end
+
+function inserts.getname(number)
+    return data[name].name
+end
+
+function inserts.getnumber(name)
+    return data[name].number
+end
+
+-- interface
+
+implement {
+    name      = "defineinsertion",
+    actions   = inserts.define,
+    arguments = {
+        "string",
+        {
+            { "number", "integer" }
+        }
+    }
+}
+
+implement {
+    name      = "setupinsertion",
+    actions   = inserts.setup,
+    arguments = {
+        "string",
+        {
+            { "location" }
+        }
+    }
+}
+
+implement {
+    name      = "setinsertionlocation",
+    actions   = inserts.setlocation,
+    arguments = { "string", "string" }
+}
+
+implement {
+    name      = "insertionnumber",
+    actions   = function(name) context(data[name].number or 0) end,
+    arguments = "string"
+}
+