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Contents
require 'v8'
require 'jsduck/util/json'
require 'jsduck/util/singleton'
module JsDuck
# Runs Esprima.js through V8.
#
# Initialized as singleton to avoid loading the esprima.js more
# than once - otherwise performace will severely suffer.
class Esprima
include Util::Singleton
def initialize
@v8 = V8::Context.new
esprima = File.dirname(File.expand_path(__FILE__))+"/esprima/esprima.js";
# Esprima attempts to assign to window.esprima, but our v8
# engine has no global window variable defined. So define our
# own and then grab esprima out from it again.
@v8.eval("var window = {};")
@v8.load(esprima)
@v8.eval("var esprima = window.esprima;")
end
# Parses JavaScript source code using Esprima.js
#
# Returns the resulting AST
def parse(input)
@v8['js'] = input
json = @v8.eval("JSON.stringify(esprima.parse(js, {comment: true, range: true, raw: true}))")
return Util::Json.parse(json, :max_nesting => false)
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems