| 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170 |
1×
1×
1×
1×
16×
319×
315×
401×
11×
11×
11×
17×
1×
16×
10×
10×
6×
3×
6×
11×
182×
124×
2×
308×
122×
1×
121×
367×
367×
441×
441×
417×
333×
34×
401×
401×
2×
399×
2×
397×
401×
6×
395×
337×
337×
337×
337×
337×
337×
1896×
27×
27×
27×
6×
6×
4×
4×
4×
21×
21×
20×
20×
5×
20×
20×
24×
79×
79×
79×
1790×
1790×
334×
334×
1×
333×
1×
464×
464×
1×
21×
21×
78×
2×
78×
22×
22×
20×
1×
1×
396×
396×
396×
396×
396×
1×
| '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 (key === 'size' && (_.isArray(obj) || _.isString(obj))) {
val = obj.length
} else if (_.isNil(obj)) {
val = undefined
} 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)
}
|