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# coding: utf-8
require 'open3'
require 'json'
module Pandoc
def self.prog
@prog ||= 'pandoc'
end
def self.prog=(val)
@prog = val
end
def self.load(fmt, input)
cmd = Pandoc::prog + " -t json"
unless fmt.nil?
cmd += " -f " + fmt
end
str = input
if str.respond_to? :read
str = str.read
end
json = ''
errors = ''
Open3::popen3(cmd) do |stdin, stdout, stderr|
stdin.puts(str)
stdin.close
json = stdout.read
errors = stderr.read
end
unless errors.empty?
raise errors
end
return Pandoc::AST::new(json)
end
class AST
def initialize(json)
@js = JSON::parse(json)
end
def [](key)
Pandoc::AST::js2sane(@js["meta"][key])
end
def js
@js
end
def to(format)
cmd = Pandoc::prog + " -f json -t " + format.to_s
output = ''
errors = ''
Open3::popen3(cmd) do |stdin, stdout, stderr|
stdin.puts @js.to_json
stdin.close
output = stdout.read
errors = stderr.read
end
unless errors.empty?
raise errors
end
return output
end
def self.js2sane(js)
if js.nil?
return js
end
case js["t"]
when "MetaMap"
Hash[js["c"].map{|k,v| [k, js2sane(v)]}]
when "MetaList"
js["c"].map{|c| js2sane(c)}
when "MetaBool"
js["c"]
when "MetaString"
js["c"]
when "MetaInlines"
js["c"].map{|c| js2sane(c)}.join()
when "MetaBlocks"
js["c"].map{|c| js2sane(c)}.join("\n")
when "Str"
js["c"]
when "Space"
" "
when "RawInline"
js["c"][1]
when "RawBlock"
js["c"][1]
when "Para"
js["c"].map{|c| js2sane(c)}.join()
else
raise "Unexpected AST node type '#{js["t"]}'"
end
end
end
end
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