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[ruby/yarp] Add Node#copy and MutationVisitor
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Original file line number | Diff line number | Diff line change |
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module YARP | ||
# This visitor walks through the tree and copies each node as it is being | ||
# visited. This is useful for consumers that want to mutate the tree, as you | ||
# can change subtrees in place without effecting the rest of the tree. | ||
class MutationVisitor < BasicVisitor | ||
<%- nodes.each_with_index do |node, index| -%> | ||
<%= "\n" if index != 0 -%> | ||
# Copy a <%= node.name %> node | ||
def visit_<%= node.human %>(node) | ||
<%- params = node.params.select { |param| [NodeParam, OptionalNodeParam, NodeListParam].include?(param.class) } -%> | ||
<%- if params.any? -%> | ||
node.copy(<%= params.map { |param| "#{param.name}: visit(node.#{param.name})" }.join(", ") %>) | ||
<%- else -%> | ||
node.copy | ||
<%- end -%> | ||
end | ||
<%- end -%> | ||
end | ||
end |
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