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| const _ = require('./util/underscore.js')
const lexical = require('./lexical.js')
const assert = require('./util/assert.js')
var Scope = {
getAll: function () {
var ctx = {}
for (var i = this.scopes.length - 1; i >= 0; i--) {
_.assign(ctx, this.scopes[i])
}
return ctx
},
get: function (str) {
try {
return this.getPropertyByPath(this.scopes, str)
} catch (e) {
if (!/undefined variable/.test(e.message) || this.opts.strict_variables) {
throw e
}
}
},
set: function (k, v) {
var scope = this.findScopeFor(k)
setPropertyByPath(scope, k, v)
return this
},
push: function (ctx) {
assert(ctx, `trying to push ${ctx} into scopes`)
return this.scopes.push(ctx)
},
pop: function () {
return this.scopes.pop()
},
findScopeFor: function (key) {
var i = this.scopes.length - 1
while (i >= 0 && !(key in this.scopes[i])) {
i--
}
if (i < 0) {
i = this.scopes.length - 1
}
return this.scopes[i]
},
unshift: function (ctx) {
assert(ctx, `trying to push ${ctx} into scopes`)
return this.scopes.unshift(ctx)
},
shift: function () {
return this.scopes.shift()
},
getPropertyByPath: function (scopes, path) {
var paths = this.propertyAccessSeq(path + '')
if (!paths.length) {
throw new TypeError('undefined variable: ' + path)
}
var key = paths.shift()
var value = getValueFromScopes(key, scopes)
return paths.reduce(
(value, key) => {
if (_.isNil(value)) {
throw new TypeError('undefined variable: ' + key)
}
return getValueFromParent(key, value)
},
value
)
},
/*
* Parse property access sequence from access string
* @example
* accessSeq("foo.bar") // ['foo', 'bar']
* accessSeq("foo['bar']") // ['foo', 'bar']
* accessSeq("foo['b]r']") // ['foo', 'b]r']
* accessSeq("foo[bar.coo]") // ['foo', 'bar'], for bar.coo == 'bar'
*/
propertyAccessSeq: function (str) {
var seq = []
var name = ''
var j
var i = 0
while (i < str.length) {
switch (str[i]) {
case '[':
push()
var delemiter = str[i + 1]
if (/['"]/.test(delemiter)) { // foo["bar"]
j = str.indexOf(delemiter, i + 2)
assert(j !== -1, `unbalanced ${delemiter}: ${str}`)
name = str.slice(i + 2, j)
push()
i = j + 2
} else { // foo[bar.coo]
j = matchRightBracket(str, i + 1)
assert(j !== -1, `unbalanced []: ${str}`)
name = str.slice(i + 1, j)
if (!lexical.isInteger(name)) { // foo[bar] vs. foo[1]
name = this.get(name)
}
push()
i = j + 1
}
break
case '.':// foo.bar, foo[0].bar
push()
i++
break
default:// foo.bar
name += str[i]
i++
}
}
push()
return seq
function push () {
if (name.length) seq.push(name)
name = ''
}
}
}
function setPropertyByPath (obj, path, val) {
var paths = (path + '').replace(/\[/g, '.').replace(/\]/g, '').split('.')
for (var i = 0; i < paths.length; i++) {
var key = paths[i]
if (!_.isObject(obj)) {
// cannot set property of non-object
return
}
// for end point
if (i === paths.length - 1) {
return (obj[key] = val)
}
// if path not exist
if (undefined === obj[key]) {
obj[key] = {}
}
obj = obj[key]
}
}
function getValueFromParent (key, value) {
return (key === 'size' && (_.isArray(value) || _.isString(value)))
? value.length
: value[key]
}
function getValueFromScopes (key, scopes) {
for (var i = scopes.length - 1; i > -1; i--) {
var scope = scopes[i]
if (scope.hasOwnProperty(key)) {
return scope[key]
}
}
throw new TypeError('undefined variable: ' + key)
}
function matchRightBracket (str, begin) {
var stack = 1 // count of '[' - count of ']'
for (var i = begin; i < str.length; i++) {
if (str[i] === '[') {
stack++
}
if (str[i] === ']') {
stack--
if (stack === 0) {
return i
}
}
}
return -1
}
exports.factory = function (ctx, opts) {
var defaultOptions = {
dynamicPartials: true,
strict_variables: false,
strict_filters: false,
blocks: {},
root: []
}
var scope = Object.create(Scope)
scope.opts = _.assign(defaultOptions, opts)
scope.scopes = [ctx || {}]
return scope
}
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