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#!/usr/bin/env texlua
--------------------------------------------------------------------------------
-- FILE: rst_directives.lua
-- USAGE: called by rst_parser.lua
-- DESCRIPTION: Complement to the reStructuredText parser
-- AUTHOR: Philipp Gesang (Phg), <megas.kapaneus@gmail.com>
-- CHANGED: 2011-05-08 17:56:25+0200
--------------------------------------------------------------------------------
--
local helpers = helpers or thirddata and thirddata.rst_helpers
--------------------------------------------------------------------------------
-- Directives for use with |substitutions|
--------------------------------------------------------------------------------
local rst_directives = { }
thirddata.rst_directives = rst_directives
local rst_context = thirddata.rst
rst_directives.anonymous = 0
rst_directives.images = {}
rst_directives.images.done = {}
rst_directives.images.values = {}
rst_directives.images.keys = {
["width"] = "width",
["size"] = "width",
["caption"] = "caption",
["alt"] = "caption",
["scale"] = "scale",
}
rst_directives.images.values.scale = function (orig)
-- http://wiki.contextgarden.net/Reference/en/useexternalfigure
-- scale=1000 is original size; to get 72%, use scale=720.
return tonumber(orig) * 1000
end
rst_directives.images.values.width = {
["fit"] = "\\hsize",
["hsize"] = "\\hsize",
["broad"] = "\\hsize",
["normal"] = "local",
["normal"] = "local",
}
-- we won't allow passing arbitrary setups to context
rst_directives.images.permitted_setups = {
"width", "scale"
}
local function img_setup (properties)
local result = ""
for _, prop in next, rst_directives.images.permitted_setups do
if properties[prop] then
result = result .. prop .. "=" .. properties[prop] .. ","
end
end
if result ~= "" then
result = "[" .. result .. "]"
end
return result
end
rst_directives.image = function(name, data)
local inline_parser = rst_context.inline_parser
local properties = {}
local anon = false
local rd = rst_directives
if not data then -- this makes the “name” argument optional
data = name
rd.anonymous = rd.anonymous + 1
anon = true -- indicates a nameless picture
name = "anonymous" .. rd.anonymous
end
properties.caption = name
--properties.width = "\\local"
local processed = "" -- stub; TODO do something useful with optional dimension specifications
if type(data) == "table" then -- should always be true
local p = helpers.patterns
for _, str in ipairs(data) do
local key, val
key, val = p.colon_keyval:match(str)
local rdi = rst_directives.images
if key and val then
key = rdi.keys[key] -- sanitize key expression
if type(rdi.values[key]) == "table" then
val = rdi.values[key][val]
elseif type(rdi.values[key]) == "function" then
val = rdi.values[key](val)
end
properties[key] = val
else
processed = processed .. (str and str ~= "" and string.strip(str))
end
end
end
properties.setup = img_setup(properties) or ""
data = processed
processed = nil
local img = ""
local images_done = rd.images.done
if not anon then
if not images_done[name] then
img = img .. string.format([[
\useexternalfigure[%s][%s][]
]], name, data)
images_done[name] = true
end
img = img .. string.format([[
\def\RSTsubstitution%s{%%
\placefigure[here]{%s}{\externalfigure[%s]%s}
}
]], name, rst_context.escape(inline_parser:match(properties.caption)), name, properties.setup)
else -- image won't be referenced but used instantly
img = img .. string.format([[
\placefigure[here]{%s}{\externalfigure[%s]%s}
]], rst_context.escape(inline_parser:match(properties.caption)), data, properties.setup)
end
return img
end
rst_directives.caution = function(raw)
local inline_parser = rst_context.inline_parser
rst_context.addsetups("dbend")
rst_context.addsetups("caution")
local text
local first = true
for _, line in ipairs(raw) do
if not helpers.patterns.spacesonly:match(line) then
if first then
text = line
first = false
else
text = text .. " " .. line
end
end
end
text = rst_context.escape(helpers.string.wrapat(inline_parser:match(text)))
return string.format([[
\startRSTcaution
%s
\stopRSTcaution
]], text)
end
rst_directives.danger = function(raw)
local inline_parser = rst_context.inline_parser
rst_context.addsetups("dbend")
rst_context.addsetups("danger")
local text
local first = true
for _, line in ipairs(raw) do
if not helpers.patterns.spacesonly:match(line) then
if first then
text = line
first = false
else
text = text .. " " .. line
end
end
end
text = rst_context.escape(helpers.string.wrapat(inline_parser:match(text)))
return string.format([[
\startRSTdanger
%s
\stopRSTdanger
]], text)
end
-- http://docutils.sourceforge.net/docs/ref/rst/directives.html
rst_directives.DANGER = function(addendum)
local result = ""
for _,str in ipairs(addendum) do
result = result .. (string.strip(str))
end
return string.format([[
%% The Rabbit of Caerbannog
\startlinecorrection
\blank[force,big]
\framed[frame=on,
corner=round,
rulethickness=5pt,
align=middle,
width=\hsize,
frameoffset=.5em,
backgroundoffset=1em,
background=color,
backgroundcolor=red,
foreground=color,
foregroundcolor=black]{%%
\language[en-gb]\tfb\bf
Follow only if ye be men of valour, for the entrance to this cave is guarded
by a creature so foul, so cruel that no man yet has fought with it and lived.
Bones of full fifty men lie strewn about its lair. So, brave knights, if you
do doubt your courage or your strength, come no further, for death awaits you
all with nasty, big, pointy teeth.%%
\blank[force,big]
%s%%
}
\blank[force,big]
\stoplinecorrection
]], result)
end
rst_directives.mp = function(name, data)
local mpcode = string.format([[
\startreusableMPgraphic{%s}
%s
\stopreusableMPgraphic
]], name, data)
mpcode = mpcode .. string.format([[
\def\RSTsubstitution%s{%%
\reuseMPgraphic{%s}%%
}
]], name, name)
return mpcode
end
rst_directives.ctx = function(name, data)
local ctx = string.format([[
\startbuffer[%s]
%s\stopbuffer
\def\RSTsubstitution%s{%%
\getbuffer[%s]%%
}
]], name, data, name, name)
return ctx
end
rst_directives.lua = function(name, data)
local luacode = string.format([[
\startbuffer[%s]
\startluacode
%s
\stopluacode
\stopbuffer
\def\RSTsubstitution%s{%%
\getbuffer[%s]%%
}
]], name, data, name, name)
return luacode
end
rst_directives.replace = function(name, data)
return string.format([[
\def\RSTsubstitution%s{%s}
]], name, data)
end
|