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Contents
module JsDuck
module Js
# Traverses syntax tree while keeping track of variables that are
# bound to `this`.
class ScopedTraverser
def initialize
@this_map = {
"this" => true
}
end
# Loops recursively over all the sub-nodes of the given node,
# calling the provided block for each sub-node.
def traverse(node, &block)
node.body.each do |child|
yield child
if this_var?(child)
var_name = child["id"].to_s
@this_map[var_name] = true
end
traverse(child, &block)
end
end
# True when variable with given name is bound to `this`.
def this?(var_name)
@this_map[var_name]
end
private
# True when initialization of variable with `this`
def this_var?(node)
node.type == "VariableDeclarator" && node["init"].type == "ThisExpression"
end
end
end
end
Version data entries
28 entries across 28 versions & 3 rubygems