Module: Middleman::Util::Data

Extended by:
Memoist
Includes:
Contracts
Defined in:
middleman-core/lib/middleman-core/util/data.rb

Constant Summary

Constants included from Contracts

Contracts::PATH_MATCHER, Contracts::ResourceList, Contracts::VectorOf

Class Method Summary collapse

Methods included from Contracts

#Contract

Class Method Details

.build_regex(frontmatter_delims) ⇒ Object



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# File 'middleman-core/lib/middleman-core/util/data.rb', line 90

def build_regex(frontmatter_delims)
  start_delims, stop_delims = frontmatter_delims
                              .values
                              .flatten(1)
                              .transpose
                              .map(&::Regexp.method(:union))

  /
    \A(?:[^\r\n]*coding:[^\r\n]*\r?\n)?
    (?<start>#{start_delims})[ ]*\r?\n
    (?<frontmatter>.*?)[ ]*\r?\n?
    ^(?<stop>#{stop_delims})[ ]*\r?\n?
    \r?\n?
    (?<additional_content>.*)
  /mx
end

.parse(file, frontmatter_delims, known_type = nil) ⇒ Object



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# File 'middleman-core/lib/middleman-core/util/data.rb', line 49

def parse(file, frontmatter_delims, known_type=nil)
  full_path = file[:full_path]
  return [{}, nil] if ::Middleman::Util.binary?(full_path) || file[:types].include?(:binary)

  # Avoid weird race condition when a file is renamed
  begin
    content = file.read
  rescue EOFError, IOError, ::Errno::ENOENT
    return [{}, nil]
  end

  match = build_regex(frontmatter_delims).match(content) || {}

  unless match[:frontmatter]
    case known_type
    when :yaml
      return [parse_yaml(content, full_path), nil]
    when :json
      return [parse_json(content, full_path), nil]
    end
  end

  case [match[:start], match[:stop]]
  when *frontmatter_delims[:yaml]
    [
      parse_yaml(match[:frontmatter], full_path),
      match[:additional_content]
    ]
  when *frontmatter_delims[:json]
    [
      parse_json("{#{match[:frontmatter]}}", full_path),
      match[:additional_content]
    ]
  else
    [
      {},
      content
    ]
  end
end

.parse_json(content, full_path) ⇒ Object



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# File 'middleman-core/lib/middleman-core/util/data.rb', line 127

def parse_json(content, full_path)
  c = ::Middleman::Util.instrument 'parse.json' do
    ::JSON.parse(content)
  end
  c ? symbolize_recursive(c) : {}
rescue StandardError => error
  warn "JSON Exception parsing #{full_path}: #{error.message}"
  {}
end

.parse_yaml(content, full_path) ⇒ Object



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# File 'middleman-core/lib/middleman-core/util/data.rb', line 112

def parse_yaml(content, full_path)
  c = ::Middleman::Util.instrument 'parse.yaml' do
    ::YAML.load(content)
  end
  c ? symbolize_recursive(c) : {}
rescue StandardError, ::Psych::SyntaxError => error
  warn "YAML Exception parsing #{full_path}: #{error.message}"
  {}
end

.StringHash

Parse JSON frontmatter out of a string



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# File 'middleman-core/lib/middleman-core/util/data.rb', line 111

Contract String, Pathname => Hash

.symbolize_recursive(value) ⇒ Object



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# File 'middleman-core/lib/middleman-core/util/data.rb', line 138

def symbolize_recursive(value)
  case value
  when Hash
    value.map { |k, v| [k.to_sym, symbolize_recursive(v)] }.to_h
  when Array
    value.map { |v| symbolize_recursive(v) }
  else
    value
  end
end