Module: JekyllHighlightCards::PolaroidMarkup

Defined in:
lib/jekyll-highlight-cards/polaroid_markup.rb

Overview

Shared structural parser for {% polaroid %} markup.

Used by PolaroidTag at render time (with Liquid evaluation applied by the tag) and by freeze-archives analysis on unevaluated tokens.

Class Method Summary collapse

Class Method Details

.parse(markup) ⇒ Hash

Parse polaroid markup into image URL and named parameters (unevaluated)



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# File 'lib/jekyll-highlight-cards/polaroid_markup.rb', line 15

def parse(markup)
  tokens = tokenize(markup)

  image_url_token = tokens.shift
  result = { image_url: image_url_token }
  tokens.each do |token|
    next unless token =~ /\A(\w+)=(.+)\z/

    key = Regexp.last_match(1).to_sym
    value_token = Regexp.last_match(2)
    result[key] = value_token
  end

  result
end

.tokenize(markup) ⇒ Array<String>

Tokenize markup respecting quotes (single or double) and Liquid brace depth



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# File 'lib/jekyll-highlight-cards/polaroid_markup.rb', line 35

def tokenize(markup)
  tokens = []
  current = ""
  in_quotes = false
  quote_char = nil
  in_liquid = 0
  escaped = false

  # Trailing space flushes the final token through the whitespace branch
  "#{markup} ".each_char do |char|
    if escaped
      current += char
      escaped = false
      next
    end

    if char == "\\" && in_quotes
      escaped = true
      next
    end

    if char == "{" && !in_quotes
      in_liquid += 1
      current += char
    elsif char == "}" && in_liquid.positive? && !in_quotes
      in_liquid -= 1
      current += char
    elsif ['"', "'"].include?(char) && !in_quotes
      in_quotes = true
      quote_char = char
      current += char
    elsif char == quote_char
      in_quotes = false
      current += char
      quote_char = nil
    elsif char.match?(/\s/) && !in_quotes && in_liquid.zero?
      tokens << current
      current = ""
    else
      current += char
    end
  end

  tokens
end