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require 'yaml'
module KramdownRFC
module YAMLcheck
def self.short_name(node)
if node.scalar?
node.value
else
node.children&.map {|nm| short_name(nm)}&.join("_")
end
end
# Does not follow aliases.
def self.check_dup_keys1(node, path)
if YAML::Nodes::Mapping === node
children = node.children.each_slice(2)
duplicates = children.map { |key_node, _value_node|
key_node }.group_by{|nm| short_name(nm)}.select { |_value, nodes| nodes.size > 1 }
duplicates.each do |key, nodes|
name = (path + [key]).join("/")
lines = nodes.map { |occurrence| occurrence.start_line + 1 }.join(", ")
warn "** duplicate map key >#{name}< in YAML, lines #{lines}"
end
children.each do |key_node, value_node|
newname = short_name(key_node)
check_dup_keys1(value_node, path + Array(newname))
end
else
node.children.to_a.each { |child| check_dup_keys1(child, path) }
end
end
def self.check_dup_keys(data)
ast = YAML.parse_stream(data)
check_dup_keys1(ast, [])
end
# check_dup_keys(DATA)
end
end
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