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Size: 1.25 KB
Versions: 12
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Contents
# frozen_string_literal: true
module Synvert::Core
# QueryScope finds out nodes by using node query language, then changes its scope to matching node.
class Rewriter::QueryScope < Rewriter::Scope
# Initialize a QueryScope.
#
# @param instance [Synvert::Core::Rewriter::Instance]
# @param query_string [String]
# @yield run on all matching nodes
def initialize(instance, query_string, &block)
super(instance, &block)
@query_string = query_string
end
# Find out the matching nodes.
#
# It checks the current node and iterates all child nodes,
# then run the block code on each matching node.
# @raise [Synvert::Core::NodeQuery::Compiler::ParseError] if the query string is invalid.
def process
current_node = @instance.current_node
return unless current_node
@instance.process_with_node(current_node) do
NodeQuery::Parser.new.parse(@query_string).query_nodes(current_node).each do |node|
@instance.process_with_node(node) do
@instance.instance_eval(&@block)
end
end
end
rescue NodeQuery::Lexer::ScanError, Racc::ParseError => e
raise NodeQuery::Compiler::ParseError, "Invalid query string: #{@query_string}"
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems