diff options
Diffstat (limited to 'Master/texmf-dist/tex/context/base/scrn-hlp.lua')
-rw-r--r-- | Master/texmf-dist/tex/context/base/scrn-hlp.lua | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/scrn-hlp.lua b/Master/texmf-dist/tex/context/base/scrn-hlp.lua new file mode 100644 index 00000000000..81d68840b15 --- /dev/null +++ b/Master/texmf-dist/tex/context/base/scrn-hlp.lua @@ -0,0 +1,120 @@ +if not modules then modules = { } end modules ['scrn-hlp'] = { + version = 1.001, + comment = "companion to scrn-hlp.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local format = string.format + +local help = { } +interactions.help = help + +local a_help = attributes.private("help") + +local has_attribute = node.has_attribute +local copy_nodelist = node.copy_list +local hpack_nodelist = node.hpack + +local register_list = nodes.pool.register + +local nodecodes = nodes.nodecodes + +local hlist_code = nodecodes.hlist +local vlist_code = nodecodes.vlist + +local data, references = { }, { } + +local helpscript = [[ + function Hide_All_Help(prefix) { + var n = 0 + while (true) { + n += 1 ; + v = this.getField(prefix + n) ; + if (v) { + v.hidden = true ; + this.dirty = false ; + } else { + return ; + } + } + } +]] + +local template = "javascript(Hide_All_Help{help:}),action(show{help:%s})" + +function help.register(number,name,box) + if helpscript then + interactions.javascripts.setpreamble("HelpTexts",helpscript) + helpscript = false + end + local b = copy_nodelist(tex.box[box]) + register_list(b) + data[number] = b + if name and name ~= "" then + references[name] = number + structures.references.define("",name,format(template,number)) + end +end + +local function collect(head,used) + while head do + local id = head.id + if id == hlist_code then + local a = has_attribute(head,a_help) + if a then + if not used then + used = { a } + else + used[#used+1] = a + end + else + used = collect(head.list,used) + end + elseif id == vlist_code then + used = collect(head.list,used) + end + head = head.next + end + return used +end + +function help.collect(box) + if next(data) then + return collect(tex.box[box].list) + end +end + +commands.registerhelp = help.register + +function commands.collecthelp(box) + local used = help.collect(box) + if used then + local done = { } + context.startoverlay() + for i=1,#used do + local d = data[used[i]] + if d and not done[d] then + local box = hpack_nodelist(copy_nodelist(d)) + context(false,box) + done[d] = true + else + -- error + end + end + context.stopoverlay() + end +end + +function help.reference(name) + return references[name] or tonumber(name) or 0 +end + +function commands.helpreference(name) + context(references[name] or tonumber(name) or 0) +end + +function commands.helpaction(name) + context(template,references[name] or tonumber(name) or 0) +end |