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Ruby 2.5 compatibility #12

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Ruby 2.5 compatibility #12

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15 changes: 14 additions & 1 deletion lib/front_matter_parser/loader/yaml.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,20 @@ def initialize(allowlist_classes: [])
# @param string [String] front matter string representation
# @return [Hash] front matter hash representation
def call(string)
YAML.safe_load(string, permitted_classes: allowlist_classes)
if safe_load_with_permitted_classes_arg?
YAML.safe_load(string, permitted_classes: allowlist_classes)
else
YAML.safe_load(string, allowlist_classes)
end
end

def safe_load_with_permitted_classes_arg?
# This `permitted_classes` keyword argument was
# introduced in Ruby 2.6, and therefore is not
# compatible with Ruby 2.5 and earlier.
YAML
.public_method(:safe_load).parameters
.any? { |type, name| type == :key && name == :permitted_classes }
end
end
end
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