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authorMojca Miklavec <mojca.miklavec@gmail.com>2012-05-14 17:38:55 +0000
committerMojca Miklavec <mojca.miklavec@gmail.com>2012-05-14 17:38:55 +0000
commit15995e10bfc68edf79970c4ea4fbb6678566c46e (patch)
tree2de7ca2a83f2d37ef043ad7429a5cb945bb79ddb /Master/texmf-dist/tex/context/base/typo-itc.lua
parentc9a39f716f1e5ec820ed3aab2c9aef25c5a9d730 (diff)
ConTeXt 2012.05.14 16:00
git-svn-id: svn://tug.org/texlive/trunk@26371 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/texmf-dist/tex/context/base/typo-itc.lua')
-rw-r--r--Master/texmf-dist/tex/context/base/typo-itc.lua255
1 files changed, 255 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/typo-itc.lua b/Master/texmf-dist/tex/context/base/typo-itc.lua
new file mode 100644
index 00000000000..d294dd60a2e
--- /dev/null
+++ b/Master/texmf-dist/tex/context/base/typo-itc.lua
@@ -0,0 +1,255 @@
+if not modules then modules = { } end modules ['typo-itc'] = {
+ version = 1.001,
+ comment = "companion to typo-itc.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+local utfchar = utf.char
+
+local trace_italics = false trackers.register("typesetters.italics", function(v) trace_italics = v end)
+
+local report_italics = logs.reporter("nodes","italics")
+
+typesetters.italics = typesetters.italics or { }
+local italics = typesetters.italics
+
+local nodecodes = nodes.nodecodes
+local glyph_code = nodecodes.glyph
+local kern_code = nodecodes.kern
+local glue_code = nodecodes.glue
+local disc_code = nodecodes.disc
+
+local tasks = nodes.tasks
+
+local insert_node_after = node.insert_after
+local delete_node = nodes.delete
+local has_attribute = node.has_attribute
+
+local texattribute = tex.attribute
+local a_italics = attributes.private("italics")
+local unsetvalue = attributes.unsetvalue
+
+local new_correction_kern = nodes.pool.fontkern
+local new_correction_glue = nodes.pool.glue
+
+local points = number.points
+
+local fonthashes = fonts.hashes
+local fontdata = fonthashes.identifiers
+local italicsdata = fonthashes.italics
+
+local forcedvariant = false
+
+function typesetters.italics.forcevariant(variant)
+ forcedvariant = variant
+end
+
+local function setitalicinfont(font,char)
+ local tfmdata = fontdata[font]
+ local character = tfmdata.characters[char]
+ if character then
+ local italic = character.italic_correction
+ if not italic then
+ local autoitalicamount = tfmdata.properties.autoitalicamount or 0
+ if autoitalicamount ~= 0 then
+ local description = tfmdata.descriptions[char]
+ if description then
+ italic = description.italic
+ if not italic then
+ local boundingbox = description.boundingbox
+ italic = boundingbox[3] - description.width + autoitalicamount
+ if italic < 0 then -- < 0 indicates no overshoot or a very small auto italic
+ italic = 0
+ end
+ end
+ if italic ~= 0 then
+ italic = italic * tfmdata.parameters.hfactor
+ end
+ end
+ end
+ if trace_italics then
+ report_italics("setting italic correction of %s (U+%05X) of font %s to %s",utfchar(char),char,font,points(italic))
+ end
+ character.italic_correction = italic or 0
+ end
+ return italic
+ else
+ return 0
+ end
+end
+
+-- todo: clear attribute
+
+local function process(namespace,attribute,head)
+ local done = false
+ local italic = 0
+ local lastfont = nil
+ local lastattr = nil
+ local previous = nil
+ local prevchar = nil
+ local current = head
+ local inserted = nil
+ while current do
+ local id = current.id
+ if id == glyph_code then
+ local font = current.font
+ local char = current.char
+ local data = italicsdata[font]
+ if font ~= lastfont then
+ if italic ~= 0 then
+ if data then
+ if trace_italics then
+ report_italics("ignoring %s between italic %s and italic %s",points(italic),utfchar(prevchar),utfchar(char))
+ end
+ else
+ if trace_italics then
+ report_italics("inserting %s between italic %s and regular %s",points(italic),utfchar(prevchar),utfchar(char))
+ end
+ insert_node_after(head,previous,new_correction_kern(italic))
+ done = true
+ end
+ elseif inserted and data then
+ if trace_italics then
+ report_italics("deleting last correction before %s",utfchar(char))
+ end
+ delete_node(head,inserted)
+ else
+ -- nothing
+ end
+ lastfont = font
+ end
+ if data then
+ local attr = forcedvariant or has_attribute(current,attribute)
+ if attr and attr > 0 then
+ local cd = data[char]
+ if not cd then
+ -- this really can happen
+ italic = 0
+ else
+ italic = cd.italic or cd.italic_correction
+ if not italic then
+ italic = setitalicinfont(font,char) -- calculated once
+ -- italic = 0
+ end
+ if italic ~= 0 then
+ lastfont = font
+ lastattr = attr
+ previous = current
+ prevchar = char
+ end
+ end
+ else
+ italic = 0
+ end
+ else
+ italic = 0
+ end
+ inserted = nil
+ elseif id == disc_code then
+ -- skip
+ elseif id == kern_code then
+ inserted = nil
+ italic = 0
+ elseif id == glue_code then
+ if italic ~= 0 then
+ if trace_italics then
+ report_italics("inserting %s between italic %s and glue",points(italic),utfchar(prevchar))
+ end
+ inserted = new_correction_glue(italic) -- maybe just add ? else problem with penalties
+ insert_node_after(head,previous,inserted)
+ italic = 0
+ done = true
+ end
+ elseif italic ~= 0 then
+ if trace_italics then
+ report_italics("inserting %s between italic %s and whatever",points(italic),utfchar(prevchar))
+ end
+ inserted = nil
+ insert_node_after(head,previous,new_correction_kern(italic))
+ italic = 0
+ done = true
+ end
+ current = current.next
+ end
+ if italic ~= 0 and lastattr > 1 then -- more control is needed here
+ if trace_italics then
+ report_italics("inserting %s between italic %s and end of list",points(italic),utfchar(prevchar))
+ end
+ insert_node_after(head,previous,new_correction_kern(italic))
+ done = true
+ end
+ return head, done
+end
+
+local enable
+
+enable = function()
+ tasks.enableaction("processors","typesetters.italics.handler")
+ if trace_italics then
+ report_italics("enabling text italics")
+ end
+ enable = false
+end
+
+function italics.set(n)
+ if enable then
+ enable()
+ end
+ if n == variables.reset then
+ texattribute[a_italics] = unsetvalue
+ else
+ texattribute[a_italics] = tonumber(n) or unsetvalue
+ end
+end
+
+function italics.reset()
+ texattribute[a_italics] = unsetvalue
+end
+
+italics.handler = nodes.installattributehandler {
+ name = "italics",
+ namespace = italics,
+ processor = process,
+}
+
+local variables = interfaces.variables
+local settings_to_hash = utilities.parsers.settings_to_hash
+
+function commands.setupitaliccorrection(option) -- no grouping !
+ if enable then
+ enable()
+ end
+ local options = settings_to_hash(option)
+ local variant = unsetvalue
+ if options[variables.text] then
+ variant = 1
+ elseif options[variables.always] then
+ variant = 2
+ end
+ if options[variables.global] then
+ forcedvariant = variant
+ texattribute[a_italics] = unsetvalue
+ else
+ forcedvariant = false
+ texattribute[a_italics] = variant
+ end
+ if trace_italics then
+ report_italics("force: %s, variant: %s",tostring(forcedvariant),tostring(variant ~= unsetvalue and variant))
+ end
+end
+
+-- for manuals:
+
+local stack = { }
+
+function commands.pushitaliccorrection()
+ table.insert(stack,{forcedvariant, texattribute[a_italics] })
+end
+
+function commands.popitaliccorrection()
+ local top = table.remove(stack)
+ forcedvariant = top[1]
+ texattribute[a_italics] = top[2]
+end