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# frozen_string_literal: true
module Synvert::Core::NodeQuery::Compiler
# Selector used to match nodes, it combines by node type and/or attribute list, plus index or has expression.
class Selector
# Initialize a Selector.
# @param node_type [String] the node type
# @param attribute_list [Synvert::Core::NodeQuery::Compiler::AttributeList] the attribute list
# @param index [Integer] the index
# @param has_expression [Synvert::Core::NodeQuery::Compiler::Expression] the has expression
def initialize(node_type: nil, attribute_list: nil, index: nil, has_expression: nil)
@node_type = node_type
@attribute_list = attribute_list
@index = index
@has_expression = has_expression
end
# Filter nodes by index.
def filter(nodes)
return nodes if @index.nil?
nodes[@index] ? [nodes[@index]] : []
end
# Check if node matches the selector.
# @param node [Parser::AST::Node] the node
def match?(node, _operator = :==)
(!@node_type || (node.is_a?(::Parser::AST::Node) && @node_type.to_sym == node.type)) &&
(!@attribute_list || @attribute_list.match?(node)) &&
(!@has_expression || @has_expression.match?(node))
end
def to_s
str = ".#{@node_type}#{@attribute_list}"
return str if !@index && !@has_expression
return "#{str}:has(#{@has_expression})" if @has_expression
case @index
when 0
str + ':first-child'
when -1
str + ':last-child'
when (1..)
str + ":nth-child(#{@index + 1})"
else # ...-1
str + ":nth-last-child(#{-@index})"
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems