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#!/usr/bin/env texlua
--------------------------------------------------------------------------------
-- FILE: rst_context.lua
-- USAGE: ./rst_context.lua
-- DESCRIPTION:
-- OPTIONS: ---
-- REQUIREMENTS: ---
-- AUTHOR: Philipp Gesang (Phg), <megas.kapaneus@gmail.com>
-- VERSION: 1.0
-- CREATED: 31/08/10 19:35:15 CEST
--------------------------------------------------------------------------------
--
require "lpeg"
local C, Cb, Cc, Cg, Cmt, Cp, Cs, Ct, P, R, S, V, match = lpeg.C, lpeg.Cb, lpeg.Cc, lpeg.Cg, lpeg.Cmt, lpeg.Cp, lpeg.Cs, lpeg.Ct, lpeg.P, lpeg.R, lpeg.S, lpeg.V, lpeg.match
if not context then -- standard context lpeg stripper from l-string.lua
local stripper = P{
[1] = "stripper",
stripper = V"space"^0 * C((V"space"^0 * V"nospace"^1)^0),
space = S(" \t\v\n"),
nospace = 1 - V"space",
}
function string.strip(str)
return stripper:match(str) or ""
end
end
local rst_context = {}
rst_context.collected_references = {}
rst_context.collected_adornments = {}
rst_context.last_section_level = 0
rst_context.anonymous_links = 0
rst_context.context_references = {}
-- So we can use crefs[n][2] to refer to the place where the reference was
-- created.
local function get_context_reference (str)
local crefs = rst_context.context_references
refstring = "__contextref__" .. tostring(#crefs + 1)
crefs[#crefs + 1] = { refstring, str }
return refstring
end
function rst_context.emphasis (str)
return [[{\\em ]] .. str .. [[}]]
end
function rst_context.strong_emphasis (str)
return [[{\\sc ]] .. str .. [[}]]
end
function rst_context.paragraph (str)
return "\n" .. [[\\startparagraph]] .. "\n" .. str .. "\n".. [[\\stopparagraph]] .. "\n"
end
function rst_context.literal (str)
str = str:gsub([[\]], [[\\]]) -- evade escaping of backslashes
return [[\\type{]] .. str .. [[}]]
end
function rst_context.interpreted_text (...)
local tab = { ... }
--print (tab, #tab, tab[1], tab[2], tab[3])
local role, str
role = tab[1]:match("^:(.*):$") or tab[3]:match("^:(.*):$")
str = tab[2]
if not role then -- implicit role
role = "emphasis"
end
--print(role, str)
return rst_context[role](str)
end
function rst_context.link_standalone (str)
return "\n"
.. [[\\goto{\\hyphenatedurl{]]
.. str
.. [[}}[url(]]
.. str
.. [=[)]]=]
end
function rst_context.reference (str)
str = str:match("[^_]*")
local link = rst_context.collected_references[str]
if not link then -- TODO make warning instead
return([[{\\sc UNDEFINED REFERENCE ]] .. str .. [[}.]])
end
return [[\\goto{]]
.. str
.. [[}[url(]]
.. link
.. [=[)]]=]
end
function rst_context.target (tab)
--print("GOT ONE!")
--local tab = { ... }
local refs = rst_context.collected_references
local target = tab[#tab] -- Ct + C could be clearer but who cares
tab[#tab] = nil
local function resolve_indirect (r)
if r and r:match(".*_$") then -- pointing elsewhere
return resolve_indirect (refs[r:match("(.*)_$")]) or "need another run!" -- TODO multiple runs && data collection
end
return r
end
local function create_anonymous ()
rst_context.anonymous_links = rst_context.anonymous_links + 1
return "__anon__" .. rst_context.anonymous_links
end
target = resolve_indirect (target)
for i=1,#tab do
local id = tab[i]:gsub("\\:",":") -- deescaping
id = id ~= "" and id or create_anonymous ()
refs[id] = refs[id] or target
end
return ""
end
function rst_context.escape (str)
return str:gsub("\\(.)", "%1")
end
function rst_context.joinindented (tab)
return table.concat (tab, "")
end
local sectionlevels = {
[1] = "chapter",
[2] = "section",
[3] = "subsection",
[4] = "subsubsection",
[5] = "subsubsubsection",
}
local function get_line_pattern (chr)
return P(chr)^1 * (-P(1))
end
function rst_context.section (...) -- TODO general cleanup; move validity
local tab = { ... } -- checking to parser.
local section, str = true, ""
local adornchar
if #tab == 3 then -- TODO use unicode length with ConTeXt
--print(">>"..tab[1].."<>"..tab[2].."<<")
adornchar = tab[1]:sub(1,1)
-- overline == underline && len(overline) = len(sectionstring)
section = tab[1] == tab[3] and #tab[1] >= #tab[2]
-- if overline consists only of one char then keep truth value else
-- false
section = get_line_pattern(adornchar):match(tab[1]) ~= nil and section
str = string.strip(tab[2])
else -- no overline
--print(">>"..tab[1].."<>"..tab[2].."<<")
adornchar = tab[2]:sub(1,1)
section = #tab[1] <= #tab[2]
section = get_line_pattern(adornchar):match(tab[2]) ~= nil and section
str = tab[1]
end
if section then -- determine level
local level = rst_context.last_section_level
local rca = rst_context.collected_adornments
if rca[adornchar] then
level = rca[adornchar]
else
level = level + 1
rca[adornchar] = level
rst_context.last_section_level = level
end
ref = get_context_reference (str)
str = string.format("\n\\\\%s[%s]{%s}\n", sectionlevels[level], ref, str)
end
return section and str or ""
end
-- Prime time for the fancybreak module.
function rst_context.transition (str)
return "\n\\hrule\n"
end
function rst_context.bullet_list (str)
return [[
\\startitemize
]] .. str .. [[
\\stopitemize
]]
end
function rst_context.bullet_item (str)
return [[
\\item ]] .. str .. [[
]]
end
return rst_context
|
