107 lines
3.0 KiB
Ruby
107 lines
3.0 KiB
Ruby
require 'yaml'
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require 'json'
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require 'pathname'
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require 'middleman-core/util'
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require 'middleman-core/contracts'
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require 'backports/2.1.0/array/to_h'
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module Middleman
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module Util
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module Data
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include Contracts
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module_function
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# Get the frontmatter and plain content from a file
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# @param [String] path
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# @return [Array<Hash, String>]
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Contract Pathname, Maybe[Symbol] => [Hash, Maybe[String]]
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def parse(full_path, frontmatter_delims, known_type=nil)
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return [{}, nil] if ::Middleman::Util.binary?(full_path)
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# Avoid weird race condition when a file is renamed
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begin
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content = File.read(full_path)
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rescue EOFError, IOError, Errno::ENOENT
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return [{}, nil]
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end
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start_delims, stop_delims = frontmatter_delims
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.values
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.flatten(1)
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.transpose
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.map(&Regexp.method(:union))
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match = /
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\A(?:[^\r\n]*coding:[^\r\n]*\r?\n)?
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(?<start>#{start_delims})[ ]*\r?\n
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(?<frontmatter>.*?)[ ]*\r?\n?
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^(?<stop>#{stop_delims})[ ]*\r?\n?
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\r?\n?
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(?<additional_content>.*)
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/mx.match(content) || {}
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unless match[:frontmatter]
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case known_type
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when :yaml
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return [parse_yaml(content, full_path), nil]
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when :json
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return [parse_json(content, full_path), nil]
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end
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end
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case [match[:start], match[:stop]]
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when *frontmatter_delims[:yaml]
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[
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parse_yaml(match[:frontmatter], full_path),
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match[:additional_content]
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]
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when *frontmatter_delims[:json]
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[
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parse_json("{#{match[:frontmatter]}}", full_path),
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match[:additional_content]
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]
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else
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[
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{},
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content
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]
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end
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end
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# Parse YAML frontmatter out of a string
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# @param [String] content
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# @return [Hash]
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Contract String, Pathname, Bool => Hash
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def parse_yaml(content, full_path)
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symbolize_recursive(::YAML.load(content) || {})
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rescue StandardError, ::Psych::SyntaxError => error
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warn "YAML Exception parsing #{full_path}: #{error.message}"
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{}
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end
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# Parse JSON frontmatter out of a string
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# @param [String] content
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# @return [Hash]
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Contract String, Pathname => Hash
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def parse_json(content, full_path)
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symbolize_recursive(::JSON.parse(content) || {})
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rescue StandardError => error
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warn "JSON Exception parsing #{full_path}: #{error.message}"
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{}
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end
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def symbolize_recursive(value)
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case value
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when Hash
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value.map { |k, v| [k.to_sym, symbolize_recursive(v)] }.to_h
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when Array
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value.map { |v| symbolize_recursive(v) }
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else
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value
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end
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end
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end
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end
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end
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