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Date
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utils
[ DIR ]
drwxr-xr-x
2024-07-10 10:55
accessor-pairs.js
12.41
KB
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2019-09-14 01:35
array-bracket-newline.js
9.43
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2019-09-14 01:35
array-bracket-spacing.js
8.85
KB
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2019-09-14 01:35
array-callback-return.js
7.98
KB
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2019-09-14 01:35
array-element-newline.js
9.22
KB
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2023-12-15 20:21
arrow-body-style.js
10.27
KB
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2019-09-14 01:35
arrow-parens.js
6.38
KB
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2019-09-14 01:35
arrow-spacing.js
5.08
KB
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2019-09-14 01:35
block-scoped-var.js
3.58
KB
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2019-09-14 01:35
block-spacing.js
4.99
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2019-09-14 01:35
brace-style.js
7.71
KB
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2019-09-14 01:35
callback-return.js
6.33
KB
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2019-09-14 01:35
camelcase.js
8.29
KB
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2019-09-14 01:35
capitalized-comments.js
10.68
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2023-12-15 20:21
class-methods-use-this.js
3.81
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2019-09-14 01:35
comma-dangle.js
11.75
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2019-09-14 01:35
comma-spacing.js
6.53
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2019-09-14 01:35
comma-style.js
11.78
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2019-09-14 01:35
complexity.js
4.94
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2019-09-14 01:35
computed-property-spacing.js
7.17
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2019-09-14 01:35
consistent-return.js
6.59
KB
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2019-09-14 01:35
consistent-this.js
4.86
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2019-09-14 01:35
constructor-super.js
13.49
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2019-09-14 01:35
curly.js
16.24
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2019-09-14 01:35
default-case.js
2.76
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2019-09-14 01:35
default-param-last.js
1.5
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2019-09-14 01:35
dot-location.js
3.34
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2019-09-14 01:35
dot-notation.js
6.47
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2019-09-14 01:35
eol-last.js
3.79
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2019-09-14 01:35
eqeqeq.js
5.55
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2023-12-15 20:21
for-direction.js
4.27
KB
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2019-09-14 01:35
func-call-spacing.js
7.29
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2019-09-14 01:35
func-name-matching.js
9.84
KB
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2023-12-15 20:21
func-names.js
6.09
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2023-12-15 20:21
func-style.js
2.84
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2019-09-14 01:35
function-call-argument-newline.js
4.13
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2019-09-14 01:35
function-paren-newline.js
11.15
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2019-09-14 01:35
generator-star-spacing.js
6.98
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2019-09-14 01:35
getter-return.js
6.02
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2019-09-14 01:35
global-require.js
2.3
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2019-09-14 01:35
guard-for-in.js
2.3
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2019-09-14 01:35
handle-callback-err.js
2.92
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2019-09-14 01:35
id-blacklist.js
4.05
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2019-09-14 01:35
id-length.js
4.12
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2019-09-14 01:35
id-match.js
8.14
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2019-09-14 01:35
implicit-arrow-linebreak.js
2.79
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2019-09-14 01:35
indent-legacy.js
44.45
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2019-09-14 01:35
indent.js
68.68
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2019-09-14 01:35
index.js
16.34
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2019-09-14 01:35
init-declarations.js
4.37
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2019-09-14 01:35
jsx-quotes.js
2.89
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2019-09-14 01:35
key-spacing.js
24.82
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2019-09-14 01:35
keyword-spacing.js
21.2
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2019-09-14 01:35
line-comment-position.js
4.08
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2019-09-14 01:35
linebreak-style.js
3.17
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2019-09-14 01:35
lines-around-comment.js
15.54
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2019-09-14 01:35
lines-around-directive.js
7.58
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2019-09-14 01:35
lines-between-class-members.js
5.05
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2019-09-14 01:35
max-classes-per-file.js
1.73
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2019-09-14 01:35
max-depth.js
4.59
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2019-09-14 01:35
max-len.js
13.8
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2019-09-14 01:35
max-lines-per-function.js
6.89
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2019-09-14 01:35
max-lines.js
4.59
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2019-09-14 01:35
max-nested-callbacks.js
3.47
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2019-09-14 01:35
max-params.js
3.07
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2019-09-14 01:35
max-statements-per-line.js
7.31
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2019-09-14 01:35
max-statements.js
5.4
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2019-09-14 01:35
multiline-comment-style.js
14.42
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2019-09-14 01:35
multiline-ternary.js
3.42
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2019-09-14 01:35
new-cap.js
9.44
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2019-09-14 01:35
new-parens.js
3.14
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2019-09-14 01:35
newline-after-var.js
9.6
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2019-09-14 01:35
newline-before-return.js
7.89
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2019-09-14 01:35
newline-per-chained-call.js
3.56
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2019-09-14 01:35
no-alert.js
3.96
KB
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2019-09-14 01:35
no-array-constructor.js
1.36
KB
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2019-09-14 01:35
no-async-promise-executor.js
1.1
KB
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2019-09-14 01:35
no-await-in-loop.js
2.72
KB
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2019-09-14 01:35
no-bitwise.js
3.51
KB
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2019-09-14 01:35
no-buffer-constructor.js
1.31
KB
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2019-09-14 01:35
no-caller.js
1.17
KB
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2019-09-14 01:35
no-case-declarations.js
1.82
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2019-09-14 01:35
no-catch-shadow.js
2.44
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2019-09-14 01:35
no-class-assign.js
1.67
KB
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2019-09-14 01:35
no-compare-neg-zero.js
1.9
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2019-09-14 01:35
no-cond-assign.js
5.04
KB
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2019-09-14 01:35
no-confusing-arrow.js
2.55
KB
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2019-09-14 01:35
no-console.js
4.21
KB
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2019-09-14 01:35
no-const-assign.js
1.46
KB
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2019-09-14 01:35
no-constant-condition.js
8.48
KB
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2019-09-14 01:35
no-continue.js
875
B
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2019-09-14 01:35
no-control-regex.js
3.14
KB
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2019-09-14 01:35
no-debugger.js
947
B
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2019-09-14 01:35
no-delete-var.js
965
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2019-09-14 01:35
no-div-regex.js
1.42
KB
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2019-09-14 01:35
no-dupe-args.js
2.3
KB
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2019-09-14 01:35
no-dupe-class-members.js
3.58
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2019-09-14 01:35
no-dupe-keys.js
3.87
KB
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2019-09-14 01:35
no-duplicate-case.js
1.36
KB
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2019-09-14 01:35
no-duplicate-imports.js
4.43
KB
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2019-09-14 01:35
no-else-return.js
15.74
KB
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2019-09-14 01:35
no-empty-character-class.js
1.91
KB
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2019-09-14 01:35
no-empty-function.js
4.61
KB
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2019-09-14 01:35
no-empty-pattern.js
1.15
KB
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2019-09-14 01:35
no-empty.js
2.44
KB
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2019-09-14 01:35
no-eq-null.js
1.21
KB
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2019-09-14 01:35
no-eval.js
9.31
KB
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2019-09-14 01:35
no-ex-assign.js
1.37
KB
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2019-09-14 01:35
no-extend-native.js
6.95
KB
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2019-09-14 01:35
no-extra-bind.js
5.71
KB
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2019-09-14 01:35
no-extra-boolean-cast.js
6.52
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2019-09-14 01:35
no-extra-label.js
4.76
KB
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2019-09-14 01:35
no-extra-parens.js
39.11
KB
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2019-09-14 01:35
no-extra-semi.js
4.11
KB
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2019-09-14 01:35
no-fallthrough.js
4.78
KB
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2019-09-14 01:35
no-floating-decimal.js
2.33
KB
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2019-09-14 01:35
no-func-assign.js
1.96
KB
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2019-09-14 01:35
no-global-assign.js
2.76
KB
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2019-09-14 01:35
no-implicit-coercion.js
10.06
KB
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2019-09-14 01:35
no-implicit-globals.js
1.78
KB
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2019-09-14 01:35
no-implied-eval.js
5.99
KB
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2019-09-14 01:35
no-import-assign.js
6.92
KB
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2019-09-14 01:35
no-inline-comments.js
2.19
KB
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2019-09-14 01:35
no-inner-declarations.js
2.59
KB
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2019-09-14 01:35
no-invalid-regexp.js
4.01
KB
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2019-09-14 01:35
no-invalid-this.js
3.74
KB
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2019-09-14 01:35
no-irregular-whitespace.js
8.72
KB
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2019-09-14 01:35
no-iterator.js
1.08
KB
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2019-09-14 01:35
no-label-var.js
2.13
KB
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2019-09-14 01:35
no-labels.js
4.22
KB
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2019-09-14 01:35
no-lone-blocks.js
3.68
KB
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2019-09-14 01:35
no-lonely-if.js
3.62
KB
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2019-09-14 01:35
no-loop-func.js
6.16
KB
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2019-09-14 01:35
no-magic-numbers.js
5.8
KB
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2019-09-14 01:35
no-misleading-character-class.js
6.05
KB
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2019-09-14 01:35
no-mixed-operators.js
8.21
KB
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2019-09-14 01:35
no-mixed-requires.js
6.91
KB
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2019-09-14 01:35
no-mixed-spaces-and-tabs.js
4.54
KB
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2019-09-14 01:35
no-multi-assign.js
1.18
KB
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2019-09-14 01:35
no-multi-spaces.js
4.85
KB
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2019-09-14 01:35
no-multi-str.js
1.64
KB
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2019-09-14 01:35
no-multiple-empty-lines.js
5.75
KB
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2019-09-14 01:35
no-native-reassign.js
2.86
KB
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2019-09-14 01:35
no-negated-condition.js
2.68
KB
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2019-09-14 01:35
no-negated-in-lhs.js
1.08
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2019-09-14 01:35
no-nested-ternary.js
986
B
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2019-09-14 01:35
no-new-func.js
1.24
KB
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2019-09-14 01:35
no-new-object.js
923
B
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2019-09-14 01:35
no-new-require.js
960
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2019-09-14 01:35
no-new-symbol.js
1.27
KB
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2019-09-14 01:35
no-new-wrappers.js
1.05
KB
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2019-09-14 01:35
no-new.js
913
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2019-09-14 01:35
no-obj-calls.js
1.84
KB
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2019-09-14 01:35
no-octal-escape.js
1.42
KB
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2019-09-14 01:35
no-octal.js
886
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2019-09-14 01:35
no-param-reassign.js
6.8
KB
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2019-09-14 01:35
no-path-concat.js
1.44
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2019-09-14 01:35
no-plusplus.js
1.66
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2019-09-14 01:35
no-process-env.js
1.01
KB
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2019-09-14 01:35
no-process-exit.js
1.08
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2019-09-14 01:35
no-proto.js
1.07
KB
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2019-09-14 01:35
no-prototype-builtins.js
1.63
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2019-09-14 01:35
no-redeclare.js
5.6
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2019-09-14 01:35
no-regex-spaces.js
3.73
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2019-09-14 01:35
no-restricted-globals.js
3.76
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2019-09-14 01:35
no-restricted-imports.js
11.43
KB
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2023-12-15 20:21
no-restricted-modules.js
5.9
KB
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2023-12-15 20:21
no-restricted-properties.js
6.46
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2019-09-14 01:35
no-restricted-syntax.js
1.97
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2019-09-14 01:35
no-return-assign.js
2.49
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2019-09-14 01:35
no-return-await.js
3.73
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2019-09-14 01:35
no-script-url.js
1.05
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2019-09-14 01:35
no-self-assign.js
6.79
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2019-09-14 01:35
no-self-compare.js
1.72
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2019-09-14 01:35
no-sequences.js
3.94
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2019-09-14 01:35
no-shadow-restricted-names.js
2
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2019-09-14 01:35
no-shadow.js
6.81
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2019-09-14 01:35
no-spaced-func.js
2.34
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2019-09-14 01:35
no-sparse-arrays.js
1.07
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2019-09-14 01:35
no-sync.js
1.52
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2019-09-14 01:35
no-tabs.js
2.01
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2019-09-14 01:35
no-template-curly-in-string.js
1.04
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2019-09-14 01:35
no-ternary.js
793
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2019-09-14 01:35
no-this-before-super.js
9.95
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2019-09-14 01:35
no-throw-literal.js
1.26
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2019-09-14 01:35
no-trailing-spaces.js
6.13
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2019-09-14 01:35
no-undef-init.js
2.01
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2019-09-14 01:35
no-undef.js
2.24
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2019-09-14 01:35
no-undefined.js
2.07
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2019-09-14 01:35
no-underscore-dangle.js
7.44
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2019-09-14 01:35
no-unexpected-multiline.js
3.59
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2019-09-14 01:35
no-unmodified-loop-condition.js
11.65
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2019-09-14 01:35
no-unneeded-ternary.js
6.58
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2019-09-14 01:35
no-unreachable.js
6.29
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2019-09-14 01:35
no-unsafe-finally.js
3.87
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2019-09-14 01:35
no-unsafe-negation.js
2.36
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2019-09-14 01:35
no-unused-expressions.js
4.7
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2019-09-14 01:35
no-unused-labels.js
3.22
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2019-09-14 01:35
no-unused-vars.js
23.08
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2019-09-14 01:35
no-use-before-define.js
7.45
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2019-09-14 01:35
no-useless-call.js
2.78
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2019-09-14 01:35
no-useless-catch.js
1.55
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2019-09-14 01:35
no-useless-computed-key.js
3.19
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2019-09-14 01:35
no-useless-concat.js
3.16
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2019-09-14 01:35
no-useless-constructor.js
5.46
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2019-09-14 01:35
no-useless-escape.js
8.98
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2019-09-14 01:35
no-useless-rename.js
5.08
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2019-09-14 01:35
no-useless-return.js
11.77
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2019-09-14 01:35
no-var.js
12.13
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2019-09-14 01:35
no-void.js
1.03
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2019-09-14 01:35
no-warning-comments.js
5.4
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2019-09-14 01:35
no-whitespace-before-property.js
3.33
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2019-09-14 01:35
no-with.js
784
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2019-09-14 01:35
nonblock-statement-body-position.js
4.41
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2023-12-15 20:21
object-curly-newline.js
10.69
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2019-09-14 01:35
object-curly-spacing.js
11.27
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2019-09-14 01:35
object-property-newline.js
3.59
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2019-09-14 01:35
object-shorthand.js
20.66
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2019-09-14 01:35
one-var-declaration-per-line.js
2.74
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2019-09-14 01:35
one-var.js
21
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2019-09-14 01:35
operator-assignment.js
7.73
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Save
Rename
/** * @fileoverview Rule to require or disallow yoda comparisons * @author Nicholas C. Zakas */ "use strict"; //-------------------------------------------------------------------------- // Requirements //-------------------------------------------------------------------------- const astUtils = require("./utils/ast-utils"); //-------------------------------------------------------------------------- // Helpers //-------------------------------------------------------------------------- /** * Determines whether an operator is a comparison operator. * @param {string} operator The operator to check. * @returns {boolean} Whether or not it is a comparison operator. */ function isComparisonOperator(operator) { return (/^(==|===|!=|!==|<|>|<=|>=)$/u).test(operator); } /** * Determines whether an operator is an equality operator. * @param {string} operator The operator to check. * @returns {boolean} Whether or not it is an equality operator. */ function isEqualityOperator(operator) { return (/^(==|===)$/u).test(operator); } /** * Determines whether an operator is one used in a range test. * Allowed operators are `<` and `<=`. * @param {string} operator The operator to check. * @returns {boolean} Whether the operator is used in range tests. */ function isRangeTestOperator(operator) { return ["<", "<="].indexOf(operator) >= 0; } /** * Determines whether a non-Literal node is a negative number that should be * treated as if it were a single Literal node. * @param {ASTNode} node Node to test. * @returns {boolean} True if the node is a negative number that looks like a * real literal and should be treated as such. */ function looksLikeLiteral(node) { return (node.type === "UnaryExpression" && node.operator === "-" && node.prefix && node.argument.type === "Literal" && typeof node.argument.value === "number"); } /** * Attempts to derive a Literal node from nodes that are treated like literals. * @param {ASTNode} node Node to normalize. * @param {number} [defaultValue] The default value to be returned if the node * is not a Literal. * @returns {ASTNode} One of the following options. * 1. The original node if the node is already a Literal * 2. A normalized Literal node with the negative number as the value if the * node represents a negative number literal. * 3. The Literal node which has the `defaultValue` argument if it exists. * 4. Otherwise `null`. */ function getNormalizedLiteral(node, defaultValue) { if (node.type === "Literal") { return node; } if (looksLikeLiteral(node)) { return { type: "Literal", value: -node.argument.value, raw: `-${node.argument.value}` }; } if (defaultValue) { return { type: "Literal", value: defaultValue, raw: String(defaultValue) }; } return null; } /** * Checks whether two expressions reference the same value. For example: * a = a * a.b = a.b * a[0] = a[0] * a['b'] = a['b'] * @param {ASTNode} a Left side of the comparison. * @param {ASTNode} b Right side of the comparison. * @returns {boolean} True if both sides match and reference the same value. */ function same(a, b) { if (a.type !== b.type) { return false; } switch (a.type) { case "Identifier": return a.name === b.name; case "Literal": return a.value === b.value; case "MemberExpression": { const nameA = astUtils.getStaticPropertyName(a); // x.y = x["y"] if (nameA !== null) { return ( same(a.object, b.object) && nameA === astUtils.getStaticPropertyName(b) ); } /* * x[0] = x[0] * x[y] = x[y] * x.y = x.y */ return ( a.computed === b.computed && same(a.object, b.object) && same(a.property, b.property) ); } case "ThisExpression": return true; default: return false; } } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ module.exports = { meta: { type: "suggestion", docs: { description: "require or disallow \"Yoda\" conditions", category: "Best Practices", recommended: false, url: "https://eslint.org/docs/rules/yoda" }, schema: [ { enum: ["always", "never"] }, { type: "object", properties: { exceptRange: { type: "boolean", default: false }, onlyEquality: { type: "boolean", default: false } }, additionalProperties: false } ], fixable: "code", messages: { expected: "Expected literal to be on the {{expectedSide}} side of {{operator}}." } }, create(context) { // Default to "never" (!always) if no option const always = (context.options[0] === "always"); const exceptRange = (context.options[1] && context.options[1].exceptRange); const onlyEquality = (context.options[1] && context.options[1].onlyEquality); const sourceCode = context.getSourceCode(); /** * Determines whether node represents a range test. * A range test is a "between" test like `(0 <= x && x < 1)` or an "outside" * test like `(x < 0 || 1 <= x)`. It must be wrapped in parentheses, and * both operators must be `<` or `<=`. Finally, the literal on the left side * must be less than or equal to the literal on the right side so that the * test makes any sense. * @param {ASTNode} node LogicalExpression node to test. * @returns {boolean} Whether node is a range test. */ function isRangeTest(node) { const left = node.left, right = node.right; /** * Determines whether node is of the form `0 <= x && x < 1`. * @returns {boolean} Whether node is a "between" range test. */ function isBetweenTest() { let leftLiteral, rightLiteral; return (node.operator === "&&" && (leftLiteral = getNormalizedLiteral(left.left)) && (rightLiteral = getNormalizedLiteral(right.right, Number.POSITIVE_INFINITY)) && leftLiteral.value <= rightLiteral.value && same(left.right, right.left)); } /** * Determines whether node is of the form `x < 0 || 1 <= x`. * @returns {boolean} Whether node is an "outside" range test. */ function isOutsideTest() { let leftLiteral, rightLiteral; return (node.operator === "||" && (leftLiteral = getNormalizedLiteral(left.right, Number.NEGATIVE_INFINITY)) && (rightLiteral = getNormalizedLiteral(right.left)) && leftLiteral.value <= rightLiteral.value && same(left.left, right.right)); } /** * Determines whether node is wrapped in parentheses. * @returns {boolean} Whether node is preceded immediately by an open * paren token and followed immediately by a close * paren token. */ function isParenWrapped() { return astUtils.isParenthesised(sourceCode, node); } return (node.type === "LogicalExpression" && left.type === "BinaryExpression" && right.type === "BinaryExpression" && isRangeTestOperator(left.operator) && isRangeTestOperator(right.operator) && (isBetweenTest() || isOutsideTest()) && isParenWrapped()); } const OPERATOR_FLIP_MAP = { "===": "===", "!==": "!==", "==": "==", "!=": "!=", "<": ">", ">": "<", "<=": ">=", ">=": "<=" }; /** * Returns a string representation of a BinaryExpression node with its sides/operator flipped around. * @param {ASTNode} node The BinaryExpression node * @returns {string} A string representation of the node with the sides and operator flipped */ function getFlippedString(node) { const tokenBefore = sourceCode.getTokenBefore(node); const operatorToken = sourceCode.getFirstTokenBetween(node.left, node.right, token => token.value === node.operator); const textBeforeOperator = sourceCode.getText().slice(sourceCode.getTokenBefore(operatorToken).range[1], operatorToken.range[0]); const textAfterOperator = sourceCode.getText().slice(operatorToken.range[1], sourceCode.getTokenAfter(operatorToken).range[0]); const leftText = sourceCode.getText().slice(node.range[0], sourceCode.getTokenBefore(operatorToken).range[1]); const firstRightToken = sourceCode.getTokenAfter(operatorToken); const rightText = sourceCode.getText().slice(firstRightToken.range[0], node.range[1]); let prefix = ""; if (tokenBefore && tokenBefore.range[1] === node.range[0] && !astUtils.canTokensBeAdjacent(tokenBefore, firstRightToken)) { prefix = " "; } return prefix + rightText + textBeforeOperator + OPERATOR_FLIP_MAP[operatorToken.value] + textAfterOperator + leftText; } //-------------------------------------------------------------------------- // Public //-------------------------------------------------------------------------- return { BinaryExpression(node) { const expectedLiteral = always ? node.left : node.right; const expectedNonLiteral = always ? node.right : node.left; // If `expectedLiteral` is not a literal, and `expectedNonLiteral` is a literal, raise an error. if ( (expectedNonLiteral.type === "Literal" || looksLikeLiteral(expectedNonLiteral)) && !(expectedLiteral.type === "Literal" || looksLikeLiteral(expectedLiteral)) && !(!isEqualityOperator(node.operator) && onlyEquality) && isComparisonOperator(node.operator) && !(exceptRange && isRangeTest(context.getAncestors().pop())) ) { context.report({ node, messageId: "expected", data: { operator: node.operator, expectedSide: always ? "left" : "right" }, fix: fixer => fixer.replaceText(node, getFlippedString(node)) }); } } }; } };