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| 'use strict'
const _ = require('./util/underscore.js')
const lexical = require('./lexical.js')
const assert = require('./util/assert.js')
var Scope = {
getAll: function () {
return this.contexts.reduce((ctx, val) => Object.assign(ctx, val), Object.create(null))
},
get: function (path) {
let paths = this.propertyAccessSeq(path)
let scope = this.findContextFor(paths[0]) || _.last(this.contexts)
return paths.reduce((value, key) => this.readProperty(value, key), scope)
},
set: function (path, v) {
let paths = this.propertyAccessSeq(path)
let scope = this.findContextFor(paths[0]) || _.last(this.contexts)
paths.some((key, i) => {
if (!_.isObject(scope)) {
return true
}
if (i === paths.length - 1) {
scope[key] = v
return true
}
if (undefined === scope[key]) {
scope[key] = {}
}
scope = scope[key]
})
},
unshift: function (ctx) {
return this.contexts.unshift(ctx)
},
push: function (ctx) {
return this.contexts.push(ctx)
},
pop: function (ctx) {
if (!arguments.length) {
return this.contexts.pop()
}
let i = this.contexts.findIndex(scope => scope === ctx)
if (i === -1) {
throw new TypeError('scope not found, cannot pop')
}
return this.contexts.splice(i, 1)[0]
},
findContextFor: function (key, filter) {
filter = filter || (() => true)
for (let i = this.contexts.length - 1; i >= 0; i--) {
let candidate = this.contexts[i]
if (!filter(candidate)) continue
if (key in candidate) {
return candidate
}
}
return null
},
readProperty: function (obj, key) {
let val
if (_.isNil(obj)) {
val = undefined
} else {
if (typeof obj.to_liquid === 'function') {
obj = obj.to_liquid()
} else if (typeof obj.toLiquid === 'function') {
obj = obj.toLiquid()
}
if (key === 'size' && (_.isArray(obj) || _.isString(obj))) {
val = obj.length
} else {
val = obj[key]
}
}
if (_.isNil(val) && this.opts.strict_variables) {
throw new TypeError(`undefined variable: ${key}`)
}
return val
},
/*
* 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) {
str = String(str)
let seq = []
let name = ''
let j
let i = 0
while (i < str.length) {
switch (str[i]) {
case '[':
push()
let 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 []: ${str}`)
name = str.slice(i + 1, j)
if (!lexical.isInteger(name)) { // foo[bar] vs. foo[1]
name = this.get(name)
}
push()
i = j + 1
}
break
case '.':// foo.bar, foo[0].bar
push()
i++
break
default:// foo.bar
name += str[i]
i++
}
}
push()
if (!seq.length) {
throw new TypeError(`invalid path:"${str}"`)
}
return seq
function push () {
if (name.length) seq.push(name)
name = ''
}
}
}
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.contexts = [ctx || {}]
return scope
}
exports.types = {
AssignScope: Object.create(null),
CaptureScope: Object.create(null),
IncrementScope: Object.create(null),
DecrementScope: Object.create(null)
}
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