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