Class: Synvert::Core::NodeQuery::Compiler::Expression

Inherits:
Object
  • Object
show all
Defined in:
lib/synvert/core/node_query/compiler/expression.rb

Overview

Expression represents a node query expression.

Instance Method Summary collapse

Constructor Details

#initialize(selector: nil, rest: nil) ⇒ Expression

Initialize a Expression.

Parameters:



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# File 'lib/synvert/core/node_query/compiler/expression.rb', line 9

def initialize(selector: nil, rest: nil)
  @selector = selector
  @rest = rest
end

Instance Method Details

#match?(node) ⇒ Boolean

Check if the node matches the expression.

Parameters:

Returns:



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# File 'lib/synvert/core/node_query/compiler/expression.rb', line 17

def match?(node)
  !query_nodes(node).empty?
end

#query_nodes(node) ⇒ Array<Parser::AST::Node>

Query nodes by the selector and the rest expression.

Parameters:

Returns:



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# File 'lib/synvert/core/node_query/compiler/expression.rb', line 25

def query_nodes(node)
  matching_nodes = @selector.query_nodes(node)
  return matching_nodes if @rest.nil?

  matching_nodes.flat_map do |matching_node|
    @rest.query_nodes(matching_node)
  end
end

#to_s ⇒ Object 



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# File 'lib/synvert/core/node_query/compiler/expression.rb', line 34

def to_s
  result = []
  result << @selector.to_s if @selector
  result << @rest.to_s if @rest
  result.join(' ')
end