| 1 | ## our_shell: ysh
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| 2 | ## oils_failures_allowed: 1
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| 3 |
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| 4 | #### Object() creates prototype chain
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| 5 |
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| 6 | func Rect_area(this) {
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| 7 | return (this.x * this.y)
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| 8 | }
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| 9 |
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| 10 | var Rect = Object(null, {area: Rect_area})
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| 11 |
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| 12 | var rect1 = Object(Rect, {x: 3, y: 4})
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| 13 | var rect2 = Object(Rect, {x: 10, y: 20})
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| 14 |
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| 15 | # This could change to show the object?
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| 16 | # pp test_ (rect)
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| 17 |
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| 18 | # TODO: This should be a bound function
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| 19 | #pp asdl_ (rect)
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| 20 | #pp (rect.area)
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| 21 | #pp (rect->area)
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| 22 |
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| 23 | var area1 = rect1.area()
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| 24 | var area2 = rect2.area()
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| 25 |
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| 26 | pp test_ ([rect1.x, rect1.y])
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| 27 | echo "area1 = $area1"
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| 28 |
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| 29 | pp test_ ([rect2.x, rect2.y])
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| 30 | echo "area2 = $area2"
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| 31 |
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| 32 | #pp test_ (rect1.nonexistent)
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| 33 |
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| 34 | ## STDOUT:
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| 35 | (List) [3,4]
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| 36 | area1 = 12
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| 37 | (List) [10,20]
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| 38 | area2 = 200
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| 39 | ## END
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| 40 |
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| 41 | #### prototype()
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| 42 |
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| 43 | func Rect_area(this) {
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| 44 | return (this.x * this.y)
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| 45 | }
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| 46 |
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| 47 | var Rect = Object(null, {area: Rect_area})
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| 48 |
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| 49 | var obj = Object(Rect, {x: 3, y: 4})
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| 50 |
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| 51 | pp test_ (prototype(Rect))
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| 52 | pp test_ (prototype(obj))
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| 53 |
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| 54 | ## STDOUT:
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| 55 | (Null) null
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| 56 | (Obj) ("area":<Func>)
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| 57 | ## END
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| 58 |
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| 59 | #### propView()
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| 60 |
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| 61 | var obj = Object(null, {x: 3, y: 4})
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| 62 | var props = propView(obj)
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| 63 |
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| 64 | pp test_ (props)
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| 65 |
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| 66 | # object can be mutated
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| 67 | setvar props.x = 99
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| 68 |
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| 69 | pp test_ (props)
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| 70 |
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| 71 | var e = propView(null) # error
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| 72 |
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| 73 | ## status: 3
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| 74 | ## STDOUT:
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| 75 | (Dict) {"x":3,"y":4}
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| 76 | (Dict) {"x":99,"y":4}
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| 77 | ## END
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| 78 |
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| 79 | #### Mutating method lookup with ->
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| 80 |
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| 81 | func inc(self, n) {
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| 82 | setvar self.i += n
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| 83 | }
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| 84 | var Counter_methods = Object(null, {'M/inc': inc})
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| 85 |
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| 86 | var c = Object(Counter_methods, {i: 5})
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| 87 |
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| 88 | echo $[c.i]
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| 89 | call c->inc(3)
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| 90 | echo $[c.i]
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| 91 |
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| 92 | ## STDOUT:
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| 93 | 5
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| 94 | 8
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| 95 | ## END
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| 96 |
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| 97 | #### Mutating method must be up the prototype chain, not on the object
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| 98 |
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| 99 | func inc(self, n) {
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| 100 | setvar self.i += n
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| 101 | }
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| 102 | var c = Object(null, {'M/inc': inc, i: 0})
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| 103 |
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| 104 | call c->inc(3)
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| 105 |
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| 106 | ## status: 3
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| 107 | ## STDOUT:
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| 108 | ## END
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| 109 |
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| 110 |
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| 111 | #### Copy to Dict with dict(), and mutate
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| 112 |
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| 113 | var rect = Object(null, {x: 3, y: 4})
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| 114 | var d = dict(rect)
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| 115 |
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| 116 | pp test_ (rect)
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| 117 | pp test_ (d)
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| 118 |
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| 119 | setvar rect.x = 99
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| 120 | setvar d.x = 100
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| 121 |
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| 122 | pp test_ (rect)
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| 123 | pp test_ (d)
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| 124 | ## STDOUT:
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| 125 | (Obj) ("x":3,"y":4)
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| 126 | (Dict) {"x":3,"y":4}
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| 127 | (Obj) ("x":99,"y":4)
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| 128 | (Dict) {"x":100,"y":4}
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| 129 | ## END
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| 130 |
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| 131 | #### setvar obj.attr = and += and ...
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| 132 |
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| 133 | var rect = Object(null, {x: 3, y: 4})
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| 134 | pp test_ (rect)
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| 135 |
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| 136 | setvar rect.y = 99
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| 137 | pp test_ (rect)
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| 138 |
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| 139 | setvar rect.y += 3
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| 140 | pp test_ (rect)
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| 141 |
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| 142 | setvar rect.x *= 5
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| 143 | pp test_ (rect)
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| 144 |
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| 145 | ## STDOUT:
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| 146 | (Obj) ("x":3,"y":4)
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| 147 | (Obj) ("x":3,"y":99)
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| 148 | (Obj) ("x":3,"y":102)
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| 149 | (Obj) ("x":15,"y":102)
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| 150 | ## END
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| 151 |
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| 152 | #### obj['attr'] not allowed (for now)
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| 153 |
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| 154 | var rect = Object(null, {x: 3, y: 4})
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| 155 |
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| 156 | pp test_ ([rect['x'], rect['y']])
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| 157 |
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| 158 | ## status: 3
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| 159 | ## STDOUT:
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| 160 | ## END
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| 161 |
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| 162 | #### setvar obj['attr'] = 3 ?
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| 163 |
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| 164 | var rect = Object(null, {x: 3, y: 4})
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| 165 |
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| 166 | setvar rect['x'] = 99
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| 167 |
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| 168 | pp test_ (rect)
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| 169 |
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| 170 | # The reason this is allowed is because setvar does EvalLhsExpr(), which
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| 171 | # handles:
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| 172 | #
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| 173 | # - y_lhs.SubScript -> y_lvalue.Container
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| 174 | # - y_lhs.Attribute -> y_lvalue.Container
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| 175 | #
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| 176 | # So that means obj['x'] is allowed too?
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| 177 | # We could possible add y_lvalue.Container(is_subscript)
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| 178 |
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| 179 | ## status: 3
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| 180 | ## STDOUT:
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| 181 | ## END
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| 182 |
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| 183 | #### can't encode objects as JSON
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| 184 |
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| 185 | var Rect = Object(null, {})
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| 186 |
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| 187 | json write (Rect)
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| 188 | echo 'nope'
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| 189 |
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| 190 | ## status: 1
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| 191 | ## STDOUT:
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| 192 | ## END
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| 193 |
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| 194 | #### Can all builtin methods with s.upper()
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| 195 |
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| 196 | var s = 'foo'
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| 197 | var x = s.upper()
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| 198 | var y = "--$[x.lower()]"
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| 199 |
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| 200 | pp test_ (x)
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| 201 | pp test_ (y)
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| 202 |
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| 203 | ## STDOUT:
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| 204 | (Str) "FOO"
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| 205 | (Str) "--foo"
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| 206 | ## END
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| 207 |
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| 208 | #### invokable Obj must be have prototype containing __invoke__ of value.Proc - type -t
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| 209 |
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| 210 | proc p (w; self) {
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| 211 | pp test_ ([w, self])
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| 212 | }
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| 213 | p a ({x: 5, y: 6})
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| 214 | echo
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| 215 |
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| 216 | var methods = Object(null, {__invoke__: p})
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| 217 |
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| 218 | var o1 = Object(methods, {})
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| 219 | type -t o1
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| 220 | echo
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| 221 |
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| 222 | # errors
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| 223 |
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| 224 | var o2 = Object(null, {})
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| 225 | if ! type -t o2 {
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| 226 | echo 'no prototype'
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| 227 | }
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| 228 |
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| 229 | var o3 = Object(Object(null, {}), {})
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| 230 | if ! type -t o3 {
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| 231 | echo 'no __invoke__ method in prototype'
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| 232 | }
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| 233 |
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| 234 | var bad_methods = Object(null, {__invoke__: 42})
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| 235 | var o4 = Object(bad_methods, {})
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| 236 | if ! type -t o4 {
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| 237 | echo '__invoke__ of wrong type'
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| 238 | }
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| 239 |
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| 240 | ## STDOUT:
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| 241 | (List) ["a",{"x":5,"y":6}]
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| 242 |
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| 243 | invokable
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| 244 |
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| 245 | no prototype
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| 246 | no __invoke__ method in prototype
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| 247 | __invoke__ of wrong type
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| 248 | ## END
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| 249 |
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| 250 | #### Object with longer prototype chain
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| 251 |
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| 252 | # prototypal inheritance pattern
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| 253 | var superClassMethods = Object(null, {foo: 'zz'})
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| 254 | var methods = Object(superClassMethods, {foo: 42, bar: [1,2]})
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| 255 | var instance = Object(methods, {foo: 1, bar: 2, x: 3})
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| 256 |
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| 257 | pp test_ (instance)
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| 258 | pp value (instance)
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| 259 |
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| 260 | ## STDOUT:
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| 261 | (Obj) ("foo":1,"bar":2,"x":3) --> ("foo":42,"bar":[1,2]) --> ("foo":"zz")
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| 262 | (Obj) (foo: 1, bar: 2, x: 3) --> (foo: 42, bar: [1, 2]) --> (foo: 'zz')
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| 263 | ## END
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