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index.js
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index.js
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'use strict'
const ast = require('./lib/ast')
const S = ast.statement
const E = ast.expression
const D = ast.declaration
const id = ast.identifier
Builder.array = E.ARRAY
Builder.ast = ast
Builder.id = id
Builder.number = ast.number
Builder.string = ast.string
Builder.this = E.THIS
Builder.objectPath = ast.objectPath
Builder.class = require('./lib/class')
module.exports = Builder
function Builder() {
if (!(this instanceof Builder))
return new Builder()
this.body = []
}
Builder.prototype.push = function push() {
for (var i = 0; i < arguments.length; i++) {
this.body.push(arguments[i])
}
return this
}
Builder.prototype.build = function build() {
return this.body
}
Builder.prototype.reset = function reset() {
return new Builder()
}
Builder.prototype.program = function program() {
this.type = 'Program'
return this
}
// Please do not add any additional helpers above this line.
// When adding a new helper, please put them in alphabetical order.
// It makes digging through the code significantly easier.
Builder.and = function() {
if (arguments.length < 2) {
throw new Error('and requires two arguments')
}
if (arguments.length === 2) {
return E.LOGICAL(arguments[0], '&&', arguments[1])
}
const args = new Array(arguments.length)
for (let i = 0; i < arguments.length; i++) {
args[i] = arguments[i]
}
return AND(args)
}
Builder.prototype.and = function and(left, right) {
return this.push(Builder.and(left, right))
}
Builder.assign = function(key, val, op) {
op = op || '='
return S.EXPRESSION(E.ASSIGNMENT(
ast.objectPath(key)
, op
, val
))
}
Builder.prototype.assign = function assign(key, val, op) {
return this.push(Builder.assign(key, val, op))
}
Builder.prototype.array = function array(items) {
return this.push(Builder.array(items))
}
Builder.block = function(body) {
if (body && !Array.isArray(body)) {
body = [body]
}
return S.BLOCK(body)
}
Builder.prototype.block = function block(body) {
return this.push(Builder.block(body))
}
Builder.callFunction = function(fnName, args) {
return E.CALL(ast.objectPath(fnName), args)
}
Builder.prototype.callFunction = function callFunction(fnName, args) {
return this.push(Builder.callFunction(fnName, args))
}
Builder.declare = function(type, name, val) {
return D.VARIABLE([
{ type: 'VariableDeclarator'
, id: ast.identifier(name)
, init: val
}
], type)
}
Builder.prototype.declare = function declare(type, name, val) {
return this.push(Builder.declare(type, name, val))
}
Builder.equals = function(left, right) {
return E.BINARY(left, '===', right)
}
Builder.prototype.equals = function equals(left, right) {
return this.push(Builder.equals(left, right))
}
Builder.function = function(name, args, body) {
if (!Array.isArray(args)) {
throw new TypeError('args must be an array')
}
args = args.map((item) => {
return id(item)
})
name = name ? id(name) : null
return D.FUNCTION(name, args, S.BLOCK(body))
}
Builder.prototype.function = function(name, args, body) {
return this.push(Builder.function(name, args, body))
}
Builder.if = function(test, block, alt) {
return S.IF(test, block, alt)
}
Builder.prototype.if = function(test, block, alt) {
return this.push(Builder.if(test, block, alt))
}
Builder.ifNot = function(test, block, alt) {
return Builder.if(Builder.not(test), block, alt)
}
Builder.prototype.ifNot = function ifNot(test, block, alt) {
return this.push(Builder.ifNot(test, block, alt))
}
Builder.instanceOf = function(left, right) {
return E.BINARY(left, 'instanceof', right)
}
Builder.prototype.instanceOf = function instanceOf(left, right) {
return this.push(Buffer.instanceOf(left, right))
}
Builder.module = function(name) {
const assignment = typeof name === 'string'
? id(name)
: name
return S.EXPRESSION(E.ASSIGNMENT(
E.MEMBER(id('module'), id('exports'), false)
, '='
, assignment
))
}
Builder.prototype.module = function(name) {
return this.push(Builder.module(name))
}
Builder.new = function(fnName, args) {
args = (args || []).map((item) => {
if (typeof item === 'string')
return id(item)
return item
})
return E.NEW(id(fnName), args)
}
Builder.prototype.new = function(fnName, args) {
return this.push(Builder.new(fnName, args))
}
Builder.not = function(arg) {
return E.UNARY('!', arg, true)
}
Builder.prototype.not = function not(arg) {
return this.push(Builder.not(arg))
}
Builder.notEquals = function(left, right) {
return E.BINARY(left, '!==', right)
}
Builder.prototype.notEquals = function notEquals(left, right) {
return this.push(Builder.notEquals(left, right))
}
Builder.prototype.number = function number(val) {
return this.push(Builder.number(val))
}
Builder.object = function(properties) {
return E.OBJECT(Object.keys(properties).map((key) => {
const keyExpression = ast.utils.validIdentifier(key)
? id(key) : ast.string(key)
return ast.property(keyExpression, properties[key])
}))
}
Builder.or = function(left, right) {
return E.LOGICAL(left, '||', right)
}
Builder.prototype.or = function or(left, right) {
return this.push(Builder.or(left, right))
}
Builder.regex = function(re) {
const str = re.toString()
let pattern = str.slice(1)
const flags = str.match(/[gimuy]*$/)[0]
if (flags.length) {
pattern = pattern.slice(0, -flags.length - 1)
} else {
pattern = pattern.slice(0, -1)
}
const r = new RegExp(pattern, flags)
return ast.regex(r, str, pattern, flags)
}
Builder.prototype.regex = function regex(re) {
return this.push(Builder.regex(re))
}
Builder.require = function(str, prop) {
const callee = ast.identifier('require')
const c = E.CALL(callee, [
Builder.string(str)
])
if (prop) {
return E.MEMBER(c, ast.identifier(prop), false)
}
return c
}
Builder.prototype.require = function(str, prop) {
return this.push(Builder.require(str, prop))
}
Builder.returns = function(arg) {
return S.RETURN(arg)
}
Builder.prototype.returns = function returns(arg) {
return this.push(Builder.returns(arg))
}
Builder.prototype.string = function string(val) {
return this.push(Builder.string(val))
}
Builder.ternary = function(test, block, alt) {
return S.EXPRESSION(E.CONDITIONAL(test, block, alt))
}
Builder.prototype.ternary = function ternary(test, block, alt) {
return this.push(Builder.ternary(test, block, alt))
}
Builder.prototype.throws = function throws(arg) {
return this.push(S.THROWS(arg))
}
Builder.typeof = function(str) {
return E.TYPEOF(ast.objectPath(str))
}
Builder.prototype.typeof = function(str) {
return this.push(Builder.typeof(str))
}
Builder.prototype.use = function use(n) {
const str = `use ${n}`
const ele = S.EXPRESSION(ast.string(str))
return this.push(ele)
}
Builder.Error = function(msg) {
return genError('Error', msg)
}
Builder.TypeError = function(msg) {
return genError('TypeError', msg)
}
Builder.RangeError = function(msg) {
return genError('RangeError', msg)
}
function genError(type, arg) {
if (typeof arg === 'string') {
return Builder.new(type, [
Builder.string(arg)
])
}
return Builder.new(type, [arg])
}
// say we have args.length === 3
// we will end up with this
// E.LOGICAL(args[0], '&&', E.LOGICAL(
// args[1], '&&', args[2]
// ))
function AND(args) {
args = args.slice()
let right
let left = args.shift()
while (args.length) {
right = args.shift()
left = E.LOGICAL(left, '&&', right)
}
return left
}