esfuzz

Fuzzer for generative testing of ECMAScript parsers, especially those that
implement the SpiderMonkey Reflect.parse API.

Install

npm install -g esfuzz

Usage

$3

$ esfuzz --help

Usage: esfuzz OPT*

-n, --iterations NUM use at most NUM programs; default: unlimited
-d, --max-depth NUM create ASTs with a height no greater than NUM; default: 8
--acorn enable marijnh/acorn parser; default: on
--es6 allow ECMAScript 6 features in generated programs
--esprima enable ariya/esprima parser; default: on
--help display this help message and exit
--reflect enable Reflect.parse parser; default: on if it exists
--reflectjs enable zaach/reflect.js parser
--uglifyjs enable limited support for mishoo/UglifyJS2
--version display the version number and exit
--zeparser enable limited support for qfox/ZeParser

$3

#### generate(options) -> SpiderMonkey_AST

Generate a random SpiderMonkey AST that represents a valid ECMAScript program.
Available options:

* maxDepth: create ASTs with a height no greater than this value

#### render(programAST, format) -> String (JS program)

Render a SpiderMonkey AST as an ECMAScript program. If the format argument is
omitted, a random format will be used. Otherwise, the given object must be in
the format of escodegen's format option.

#### fuzz(programAST, parsers) -> void

Takes a SpiderMonkey AST and a list of objects that have a parse method that
obeys the SpiderMonkey Reflect.parse API. This function will generate concrete
syntax and run it through each parser. If any of the parsers fail to parse the
program, an error will be thrown.

#### fuzzAndRoundtrip(programAST, parsers) -> void

Identical to fuzz, except additionally compares the outputs of each parser to
the generated program. If any of the parsers fail to parse the program or fail
to generate an AST equivalent to the given one, an error will be thrown.