blog/_plugins/latex.rb

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Ruby
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2018-05-28 12:33:21 +00:00
require "mathematical"
# module Jekyll
# class LatexGenerator < Generator
# safe true
# def generate(site)
# blockRgx = /\$\$[^\$]+\$\$/
# site.posts.each do |post|
# buf = StringIO.new
# prev = 0
# post.content.to_enum(:match, blockRgx).with_index.each do |match, i|
# a, b = match.offset(i)
# buf << post.content[prev..a]
# render = Mathematical.new.render(match[i])
# buf << render[:data]
# prev = b
# end
# buf << post.content[prev..post.content.length]
# p buf.string
# end
# inlineRgx = /[^\$]\$[^\$]+\$[^\$]/
# site.posts.each do |post|
# p post.content.scan(inlineRgx)
# end
# end
# end
# end
$blockRgx = /((?<block>\$\$[^\$]+\$\$)|[^\$](?<inline>\$[^\$]+\$)[^\$])/
module Jekyll
class InlineLatex < Converter
safe true
priority :high
def matches(ext)
ext =~ /^\.md$/i
end
def output_ext(ext)
".md"
end
def convert(content)
# first pass
buf = StringIO.new
prev = 0
renderer = Mathematical.new({:base64 => true, :format => :svg})
content.to_enum(:scan, $blockRgx).map { Regexp.last_match }.to_enum.with_index.each do |match, i|
if match[:block] != nil
code = match[:block]
a, b = match.offset(:block)
else
code = match[:inline]
a, b = match.offset(:inline)
end
buf << content[prev..a].gsub(/^\$?\$/, "").gsub(/\$?\$$/, "")
render = renderer.render(code)
buf << "<img src='" + render[:data] + "' />"
prev = b - 1
end
buf << content[prev..content.length].gsub(/^\$?\$/, "")
return buf.string
end
end
end