var schema = require('boolean-json-schema')
The package exports a JSON Schema. You will need a compatible library to validate objects:
var validate = require('tv4').validate
The simplest valid expression is just a variable name:
var assert = require('assert')
assert(validate('first', schema))
The syntax is very minimal. The schema permits negation, conjunction, disjunction, and arbitrary combinations:
assert(validate({ not: 'x' }, schema))
assert(validate({ and: [ 'x', 'y' ] }, schema))
assert(validate({ or: [ 'x', 'y' ] }, schema))
assert(validate({ and: [ { or: [ 'x', 'y' ] }, { not: 'z' } ] }, schema))
Conjunctions and disjunctions must have at least two operands:
assert(validate({ and: [ 'x' ]}, schema) === false)
assert(validate({ and: [ 'x', 'y', 'z' ]}, schema) === true)
assert(validate({ or: [ 'x' ]}, schema) === false)
assert(validate({ or: [ 'x', 'y', 'z' ]}, schema) === true)