diff options
Diffstat (limited to 'tex/context/base/typo-par.lua')
| -rw-r--r-- | tex/context/base/typo-par.lua | 362 |
1 files changed, 181 insertions, 181 deletions
diff --git a/tex/context/base/typo-par.lua b/tex/context/base/typo-par.lua index b25ae4a5b..0449becbf 100644 --- a/tex/context/base/typo-par.lua +++ b/tex/context/base/typo-par.lua @@ -1,181 +1,181 @@ -if not modules then modules = { } end modules ['typo-par'] = { - version = 1.001, - comment = "companion to typo-par.mkiv", - author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", - copyright = "PRAGMA ADE / ConTeXt Development Team", - license = "see context related readme files" -} - --- A playground for experiments. - -local utfbyte = utf.byte -local utfchar = utf.char - -local trace_paragraphs = false trackers.register("typesetters.paragraphs", function(v) trace_paragraphs = v end) -local trace_dropper = false trackers.register("typesetters.paragraphs.dropper",function(v) trace_dropper = v end) - -local report_paragraphs = logs.reporter("nodes","paragraphs") -local report_dropper = logs.reporter("nodes","dropped") - -typesetters.paragraphs = typesetters.paragraphs or { } -local paragraphs = typesetters.paragraphs - -local nodecodes = nodes.nodecodes -local whatsitcodes = nodes.whatsitcodes -local tasks = nodes.tasks - -local variables = interfaces.variables - -local texattribute = tex.attribute -local unsetvalue = attributes.unsetvalue - -local glyph_code = nodecodes.glyph -local hlist_code = nodecodes.hlist -local kern_node = nodecodes.kern -local whatsit_code = nodecodes.whatsit -local localpar_code = whatsitcodes.localpar - -local a_paragraph = attributes.private("paragraphspecial") -local a_color = attributes.private('color') -local a_transparency = attributes.private('transparency') -local a_colorspace = attributes.private('colormodel') - -local dropper = { - enabled = false, - -- font = 0, - -- n = 0, - -- distance = 0, - -- hoffset = 0, - -- voffset = 0, -} - -local droppers = { } - -typesetters.paragraphs.droppers = droppers - -function droppers.set(specification) - dropper = specification or { } -end - -function droppers.freeze() - if dropper.enabled then - dropper.font = font.current() - end -end - --- dropped caps experiment (will be done properly when luatex --- stores the state in the local par node) .. btw, search still --- works with dropped caps, as does an export - --- we need a 'par' attribute and in fact for dropped caps we don't need --- need an attribute ... dropit will become s state counter (or end up --- in the localpar user data - --- for the moment, each paragraph gets a number as id (attribute) ..problem --- with nesting .. or anyhow, needed for tagging anyway - --- todo: prevent linebreak .. but normally a dropper ends up atthe top of --- a page so this has a low priority - -local function process(namespace,attribute,head) - local done = false - if head.id == whatsit_code and head.subtype == localpar_code then - -- begin of par - local a = head[attribute] - if a and a > 0 then - if dropper.enabled then - dropper.enabled = false -- dangerous for e.g. nested || in tufte - local first = head.next - if first and first.id == hlist_code then - -- parbox .. needs to be set at 0 - first = first.next - end - if first and first.id == glyph_code then --- if texattribute[a_paragraph] >= 0 then --- texattribute[a_paragraph] = unsetvalue --- end - local char = first.char - local prev = first.prev - local next = first.next - -- if prev.id == hlist_code then - -- -- set the width to 0 - -- end - if next and next.id == kern_node then - next.kern = 0 - end - first.font = dropper.font or first.font - -- can be a helper - local ma = dropper.ma or 0 - local ca = dropper.ca - local ta = dropper.ta - if ca and ca > 0 then - first[a_colorspace] = ma == 0 and 1 or ma - first[a_color] = ca - end - if ta and ta > 0 then - first[a_transparency] = ta - end - -- - local width = first.width - local height = first.height - local depth = first.depth - local distance = dropper.distance or 0 - local voffset = dropper.voffset or 0 - local hoffset = dropper.hoffset or 0 - first.xoffset = - width - hoffset - distance - first.yoffset = - height - voffset - if true then - -- needed till we can store parindent with localpar - first.prev = nil - first.next = nil - local h = node.hpack(first) - h.width = 0 - h.height = 0 - h.depth = 0 - prev.next = h - next.prev = h - h.next = next - h.prev = prev - end - if dropper.location == variables.margin then - -- okay - else - local lines = tonumber(dropper.n) or 0 - if lines == 0 then -- safeguard, not too precise - lines = math.ceil((height+voffset) / tex.baselineskip.width) - end - tex.hangafter = - lines - tex.hangindent = width + distance - end - done = true - end - end - end - end - return head, done -end - -local enabled = false - -function paragraphs.set(n) - if n == variables.reset or not tonumber(n) or n == 0 then - texattribute[a_paragraph] = unsetvalue - else - if not enabled then - tasks.enableaction("processors","typesetters.paragraphs.handler") - if trace_paragraphs then - report_paragraphs("enabling paragraphs") - end - enabled = true - end - texattribute[a_paragraph] = n - end -end - -paragraphs.attribute = a_paragraph - -paragraphs.handler = nodes.installattributehandler { - name = "paragraphs", - namespace = paragraphs, - processor = process, -} +if not modules then modules = { } end modules ['typo-par'] = {
+ version = 1.001,
+ comment = "companion to typo-par.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+-- A playground for experiments.
+
+local utfbyte = utf.byte
+local utfchar = utf.char
+
+local trace_paragraphs = false trackers.register("typesetters.paragraphs", function(v) trace_paragraphs = v end)
+local trace_dropper = false trackers.register("typesetters.paragraphs.dropper",function(v) trace_dropper = v end)
+
+local report_paragraphs = logs.reporter("nodes","paragraphs")
+local report_dropper = logs.reporter("nodes","dropped")
+
+typesetters.paragraphs = typesetters.paragraphs or { }
+local paragraphs = typesetters.paragraphs
+
+local nodecodes = nodes.nodecodes
+local whatsitcodes = nodes.whatsitcodes
+local tasks = nodes.tasks
+
+local variables = interfaces.variables
+
+local texattribute = tex.attribute
+local unsetvalue = attributes.unsetvalue
+
+local glyph_code = nodecodes.glyph
+local hlist_code = nodecodes.hlist
+local kern_node = nodecodes.kern
+local whatsit_code = nodecodes.whatsit
+local localpar_code = whatsitcodes.localpar
+
+local a_paragraph = attributes.private("paragraphspecial")
+local a_color = attributes.private('color')
+local a_transparency = attributes.private('transparency')
+local a_colorspace = attributes.private('colormodel')
+
+local dropper = {
+ enabled = false,
+ -- font = 0,
+ -- n = 0,
+ -- distance = 0,
+ -- hoffset = 0,
+ -- voffset = 0,
+}
+
+local droppers = { }
+
+typesetters.paragraphs.droppers = droppers
+
+function droppers.set(specification)
+ dropper = specification or { }
+end
+
+function droppers.freeze()
+ if dropper.enabled then
+ dropper.font = font.current()
+ end
+end
+
+-- dropped caps experiment (will be done properly when luatex
+-- stores the state in the local par node) .. btw, search still
+-- works with dropped caps, as does an export
+
+-- we need a 'par' attribute and in fact for dropped caps we don't need
+-- need an attribute ... dropit will become s state counter (or end up
+-- in the localpar user data
+
+-- for the moment, each paragraph gets a number as id (attribute) ..problem
+-- with nesting .. or anyhow, needed for tagging anyway
+
+-- todo: prevent linebreak .. but normally a dropper ends up atthe top of
+-- a page so this has a low priority
+
+local function process(namespace,attribute,head)
+ local done = false
+ if head.id == whatsit_code and head.subtype == localpar_code then
+ -- begin of par
+ local a = head[attribute]
+ if a and a > 0 then
+ if dropper.enabled then
+ dropper.enabled = false -- dangerous for e.g. nested || in tufte
+ local first = head.next
+ if first and first.id == hlist_code then
+ -- parbox .. needs to be set at 0
+ first = first.next
+ end
+ if first and first.id == glyph_code then
+-- if texattribute[a_paragraph] >= 0 then
+-- texattribute[a_paragraph] = unsetvalue
+-- end
+ local char = first.char
+ local prev = first.prev
+ local next = first.next
+ -- if prev.id == hlist_code then
+ -- -- set the width to 0
+ -- end
+ if next and next.id == kern_node then
+ next.kern = 0
+ end
+ first.font = dropper.font or first.font
+ -- can be a helper
+ local ma = dropper.ma or 0
+ local ca = dropper.ca
+ local ta = dropper.ta
+ if ca and ca > 0 then
+ first[a_colorspace] = ma == 0 and 1 or ma
+ first[a_color] = ca
+ end
+ if ta and ta > 0 then
+ first[a_transparency] = ta
+ end
+ --
+ local width = first.width
+ local height = first.height
+ local depth = first.depth
+ local distance = dropper.distance or 0
+ local voffset = dropper.voffset or 0
+ local hoffset = dropper.hoffset or 0
+ first.xoffset = - width - hoffset - distance
+ first.yoffset = - height - voffset
+ if true then
+ -- needed till we can store parindent with localpar
+ first.prev = nil
+ first.next = nil
+ local h = node.hpack(first)
+ h.width = 0
+ h.height = 0
+ h.depth = 0
+ prev.next = h
+ next.prev = h
+ h.next = next
+ h.prev = prev
+ end
+ if dropper.location == variables.margin then
+ -- okay
+ else
+ local lines = tonumber(dropper.n) or 0
+ if lines == 0 then -- safeguard, not too precise
+ lines = math.ceil((height+voffset) / tex.baselineskip.width)
+ end
+ tex.hangafter = - lines
+ tex.hangindent = width + distance
+ end
+ done = true
+ end
+ end
+ end
+ end
+ return head, done
+end
+
+local enabled = false
+
+function paragraphs.set(n)
+ if n == variables.reset or not tonumber(n) or n == 0 then
+ texattribute[a_paragraph] = unsetvalue
+ else
+ if not enabled then
+ tasks.enableaction("processors","typesetters.paragraphs.handler")
+ if trace_paragraphs then
+ report_paragraphs("enabling paragraphs")
+ end
+ enabled = true
+ end
+ texattribute[a_paragraph] = n
+ end
+end
+
+paragraphs.attribute = a_paragraph
+
+paragraphs.handler = nodes.installattributehandler {
+ name = "paragraphs",
+ namespace = paragraphs,
+ processor = process,
+}
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