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-rw-r--r--tex/context/base/typo-pag.lua358
1 files changed, 179 insertions, 179 deletions
diff --git a/tex/context/base/typo-pag.lua b/tex/context/base/typo-pag.lua
index d39748d26..0dd75ddf9 100644
--- a/tex/context/base/typo-pag.lua
+++ b/tex/context/base/typo-pag.lua
@@ -1,179 +1,179 @@
-if not modules then modules = { } end modules ['typo-pag'] = {
- version = 1.001,
- comment = "companion to typo-pag.mkiv",
- author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
- copyright = "PRAGMA ADE / ConTeXt Development Team",
- license = "see context related readme files"
-}
-
-local nodecodes = nodes.nodecodes
-
-local hlist_code = nodecodes.hlist
-local vlist_code = nodecodes.vlist
-local glue_code = nodecodes.glue
-local kern_code = nodecodes.kern
-local penalty_code = nodecodes.penalty
-
-local insert_node_after = node.insert_after
-local new_penalty = nodes.pool.penalty
-
-local unsetvalue = attributes.unsetvalue
-
-local a_keeptogether = attributes.private("keeptogether")
-
-local trace_keeptogether = false
-local report_keeptogether = logs.reporter("parbuilders","keeptogether")
-
-local cache = { }
-local last = 0
-local enabled = false
-
-trackers.register("parbuilders.keeptogether", function(v) trace_keeptogether = v end)
-
--- todo: also support lines = 3 etc (e.g. dropped caps) but how to set that
--- when no hlists are there ? ... maybe the local_par
-
-function builders.paragraphs.registertogether(line,specification) -- might change
- if not enabled then
- nodes.tasks.enableaction("finalizers","builders.paragraphs.keeptogether")
- end
- local a = line[a_keeptogether]
- local c = a and cache[a]
- if c then
- local height = specification.height
- local depth = specification.depth
- local slack = specification.slack
- if height and height > c.height then
- c.height = height
- end
- if depth and depth > c.depth then
- c.depth = depth
- end
- if slack and slack > c.slack then
- c.slack = slack
- end
- else
- last = last + 1
- cache[last] = specification
- if not specification.height then
- specification.height = 0
- end
- if not specification.depth then
- specification.depth = 0
- end
- if not specification.slack then
- specification.slack = 0
- end
- line[a_keeptogether] = last
- end
- if trace_keeptogether then
- local a = a or last
- local c = cache[a]
- if trace_keeptogether then
- local noflines = specification.lineheight
- local height = c.height
- local depth = c.depth
- local slack = c.slack
- if not noflines or noflines == 0 then
- noflines = "unknown"
- else
- noflines = math.round((height + depth - slack) / noflines)
- end
- report_keeptogether("registered, index %s, height %p, depth %p, slack %p, noflines %a",a,height,depth,slack,noflines)
- end
- end
-end
-
-local function keeptogether(start,a)
- if start then
- local specification = cache[a]
- if a then
- local current = start.next
- local previous = start
- local total = previous.depth
- local slack = specification.slack
- local threshold = specification.depth - slack
- if trace_keeptogether then
- report_keeptogether("%s, index %s, total %p, threshold %p, slack %p","list",a,total,threshold,slack)
- end
- while current do
- local id = current.id
- if id == vlist_code or id == hlist_code then
- total = total + current.height + current.depth
- if trace_keeptogether then
- report_keeptogether("%s, index %s, total %p, threshold %p","list",a,total,threshold)
- end
- if total <= threshold then
- if previous.id == penalty_code then
- previous.penalty = 10000
- else
- insert_node_after(head,previous,new_penalty(10000))
- end
- else
- break
- end
- elseif id == glue_code then
- -- hm, breakpoint, maybe turn this into kern
- total = total + current.spec.width
- if trace_keeptogether then
- report_keeptogether("%s, index %s, total %p, threshold %p","glue",a,total,threshold)
- end
- if total <= threshold then
- if previous.id == penalty_code then
- previous.penalty = 10000
- else
- insert_node_after(head,previous,new_penalty(10000))
- end
- else
- break
- end
- elseif id == kern_code then
- total = total + current.kern
- if trace_keeptogether then
- report_keeptogether("%s, index %s, total %s, threshold %s","kern",a,total,threshold)
- end
- if total <= threshold then
- if previous.id == penalty_code then
- previous.penalty = 10000
- else
- insert_node_after(head,previous,new_penalty(10000))
- end
- else
- break
- end
- elseif id == penalty_code then
- if total <= threshold then
- if previous.id == penalty_code then
- previous.penalty = 10000
- end
- current.penalty = 10000
- else
- break
- end
- end
- previous = current
- current = current.next
- end
- end
- end
-end
-
--- also look at first non glue/kern node e.g for a dropped caps
-
-function builders.paragraphs.keeptogether(head)
- local done = false
- local current = head
- while current do
- if current.id == hlist_code then
- local a = current[a_keeptogether]
- if a and a > 0 then
- keeptogether(current,a)
- current[a_keeptogether] = unsetvalue
- cache[a] = nil
- done = true
- end
- end
- current = current.next
- end
- return head, done
-end
+if not modules then modules = { } end modules ['typo-pag'] = {
+ version = 1.001,
+ comment = "companion to typo-pag.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+local nodecodes = nodes.nodecodes
+
+local hlist_code = nodecodes.hlist
+local vlist_code = nodecodes.vlist
+local glue_code = nodecodes.glue
+local kern_code = nodecodes.kern
+local penalty_code = nodecodes.penalty
+
+local insert_node_after = node.insert_after
+local new_penalty = nodes.pool.penalty
+
+local unsetvalue = attributes.unsetvalue
+
+local a_keeptogether = attributes.private("keeptogether")
+
+local trace_keeptogether = false
+local report_keeptogether = logs.reporter("parbuilders","keeptogether")
+
+local cache = { }
+local last = 0
+local enabled = false
+
+trackers.register("parbuilders.keeptogether", function(v) trace_keeptogether = v end)
+
+-- todo: also support lines = 3 etc (e.g. dropped caps) but how to set that
+-- when no hlists are there ? ... maybe the local_par
+
+function builders.paragraphs.registertogether(line,specification) -- might change
+ if not enabled then
+ nodes.tasks.enableaction("finalizers","builders.paragraphs.keeptogether")
+ end
+ local a = line[a_keeptogether]
+ local c = a and cache[a]
+ if c then
+ local height = specification.height
+ local depth = specification.depth
+ local slack = specification.slack
+ if height and height > c.height then
+ c.height = height
+ end
+ if depth and depth > c.depth then
+ c.depth = depth
+ end
+ if slack and slack > c.slack then
+ c.slack = slack
+ end
+ else
+ last = last + 1
+ cache[last] = specification
+ if not specification.height then
+ specification.height = 0
+ end
+ if not specification.depth then
+ specification.depth = 0
+ end
+ if not specification.slack then
+ specification.slack = 0
+ end
+ line[a_keeptogether] = last
+ end
+ if trace_keeptogether then
+ local a = a or last
+ local c = cache[a]
+ if trace_keeptogether then
+ local noflines = specification.lineheight
+ local height = c.height
+ local depth = c.depth
+ local slack = c.slack
+ if not noflines or noflines == 0 then
+ noflines = "unknown"
+ else
+ noflines = math.round((height + depth - slack) / noflines)
+ end
+ report_keeptogether("registered, index %s, height %p, depth %p, slack %p, noflines %a",a,height,depth,slack,noflines)
+ end
+ end
+end
+
+local function keeptogether(start,a)
+ if start then
+ local specification = cache[a]
+ if a then
+ local current = start.next
+ local previous = start
+ local total = previous.depth
+ local slack = specification.slack
+ local threshold = specification.depth - slack
+ if trace_keeptogether then
+ report_keeptogether("%s, index %s, total %p, threshold %p, slack %p","list",a,total,threshold,slack)
+ end
+ while current do
+ local id = current.id
+ if id == vlist_code or id == hlist_code then
+ total = total + current.height + current.depth
+ if trace_keeptogether then
+ report_keeptogether("%s, index %s, total %p, threshold %p","list",a,total,threshold)
+ end
+ if total <= threshold then
+ if previous.id == penalty_code then
+ previous.penalty = 10000
+ else
+ insert_node_after(head,previous,new_penalty(10000))
+ end
+ else
+ break
+ end
+ elseif id == glue_code then
+ -- hm, breakpoint, maybe turn this into kern
+ total = total + current.spec.width
+ if trace_keeptogether then
+ report_keeptogether("%s, index %s, total %p, threshold %p","glue",a,total,threshold)
+ end
+ if total <= threshold then
+ if previous.id == penalty_code then
+ previous.penalty = 10000
+ else
+ insert_node_after(head,previous,new_penalty(10000))
+ end
+ else
+ break
+ end
+ elseif id == kern_code then
+ total = total + current.kern
+ if trace_keeptogether then
+ report_keeptogether("%s, index %s, total %s, threshold %s","kern",a,total,threshold)
+ end
+ if total <= threshold then
+ if previous.id == penalty_code then
+ previous.penalty = 10000
+ else
+ insert_node_after(head,previous,new_penalty(10000))
+ end
+ else
+ break
+ end
+ elseif id == penalty_code then
+ if total <= threshold then
+ if previous.id == penalty_code then
+ previous.penalty = 10000
+ end
+ current.penalty = 10000
+ else
+ break
+ end
+ end
+ previous = current
+ current = current.next
+ end
+ end
+ end
+end
+
+-- also look at first non glue/kern node e.g for a dropped caps
+
+function builders.paragraphs.keeptogether(head)
+ local done = false
+ local current = head
+ while current do
+ if current.id == hlist_code then
+ local a = current[a_keeptogether]
+ if a and a > 0 then
+ keeptogether(current,a)
+ current[a_keeptogether] = unsetvalue
+ cache[a] = nil
+ done = true
+ end
+ end
+ current = current.next
+ end
+ return head, done
+end
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