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Contents
require "jsduck/util/singleton"
require "jsduck/js/scoped_traverser"
module JsDuck
module Js
# Looks the AST of a FunctionDeclaration or FunctionExpression for
# uses of this.fireEvent().
class Fires
include Util::Singleton
# Returns array of event names fired by the given function.
# When no events fired, empty array is returned.
def detect(function_node)
@traverser = Js::ScopedTraverser.new
events = []
@traverser.traverse(function_node["body"]) do |node|
if fire_event?(node)
events << node["arguments"][0].to_value
end
end
events.sort.uniq
end
private
# True when node is this.fireEvent("name") call.
# Also true for me.fireEvent() when me == this.
def fire_event?(node)
node.call_expression? &&
node["callee"].member_expression? &&
@traverser.this?(node["callee"]["object"].to_s) &&
node["callee"]["property"].to_s == "fireEvent" &&
node["arguments"].length > 0 &&
node["arguments"][0].value_type == "String"
end
end
end
end
Version data entries
28 entries across 28 versions & 3 rubygems