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Update: support numeric-separator in no-loss-of-precision (refs #13568)…
… (#13574)

* Update: support numeric-separator in no-loss-of-precision (refs #13568)

* Chore: changed the function jsdocs description

* Chore: removed extra getRaw calls

* Chore: update lib/rules/no-loss-of-precision.js

Co-authored-by: Milos Djermanovic <milos.djermanovic@gmail.com>

Co-authored-by: Milos Djermanovic <milos.djermanovic@gmail.com>
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anikethsaha and mdjermanovic committed Aug 29, 2020
1 parent ed64767 commit 3439fea
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Showing 3 changed files with 130 additions and 6 deletions.
2 changes: 2 additions & 0 deletions docs/rules/no-loss-of-precision.md
Expand Up @@ -16,6 +16,7 @@ const x = 5123000000000000000000000000001
const x = 1230000000000000000000000.0
const x = .1230000000000000000000000
const x = 0X20000000000001
const x = 0X2_000000000_0001;
```

Examples of **correct** code for this rule:
Expand All @@ -29,4 +30,5 @@ const x = 123e34
const x = 12300000000000000000000000
const x = 0x1FFFFFFFFFFFFF
const x = 9007199254740991
const x = 9007_1992547409_91
```
12 changes: 10 additions & 2 deletions lib/rules/no-loss-of-precision.js
Expand Up @@ -36,6 +36,14 @@ module.exports = {
return typeof node.value === "number";
}

/**
* Gets the source code of the given number literal. Removes `_` numeric separators from the result.
* @param {Node} node the number `Literal` node
* @returns {string} raw source code of the literal, without numeric separators
*/
function getRaw(node) {
return node.raw.replace(/_/gu, "");
}

/**
* Checks whether the number is base ten
Expand All @@ -55,7 +63,7 @@ module.exports = {
* @returns {boolean} true if they do not match
*/
function notBaseTenLosesPrecision(node) {
const rawString = node.raw.toUpperCase();
const rawString = getRaw(node).toUpperCase();
let base = 0;

if (rawString.startsWith("0B")) {
Expand Down Expand Up @@ -161,7 +169,7 @@ module.exports = {
* @returns {boolean} true if they do not match
*/
function baseTenLosesPrecision(node) {
const normalizedRawNumber = convertNumberToScientificNotation(node.raw);
const normalizedRawNumber = convertNumberToScientificNotation(getRaw(node));
const requestedPrecision = normalizedRawNumber.split("e")[0].replace(".", "").length;

if (requestedPrecision > 100) {
Expand Down
122 changes: 118 additions & 4 deletions tests/lib/rules/no-loss-of-precision.js
Expand Up @@ -47,14 +47,33 @@ ruleTester.run("no-loss-of-precision", rule, {
"var x = 0195",
"var x = 0e5",

{ code: "var x = 12_34_56", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 12_3.4_56", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = -12_3.4_56", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = -12_34_56", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 12_3e3_4", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 123.0e3_4", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 12_3e-3_4", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 12_3.0e-3_4", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = -1_23e-3_4", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = -1_23.8e-3_4", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 1_230000000_00000000_00000_000", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = -1_230000000_00000000_00000_000", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 0.0_00_000000000_000000000_00123", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = -0.0_00_000000000_000000000_00123", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 0e5_3", parserOptions: { ecmaVersion: 2021 } },

{ code: "var x = 0b11111111111111111111111111111111111111111111111111111", parserOptions: { ecmaVersion: 6 } },
{ code: "var x = 0b111_111_111_111_1111_11111_111_11111_1111111111_11111111_111_111", parserOptions: { ecmaVersion: 2021 } },

{ code: "var x = 0B11111111111111111111111111111111111111111111111111111", parserOptions: { ecmaVersion: 6 } },
{ code: "var x = 0B111_111_111_111_1111_11111_111_11111_1111111111_11111111_111_111", parserOptions: { ecmaVersion: 2021 } },

{ code: "var x = 0o377777777777777777", parserOptions: { ecmaVersion: 6 } },
{ code: "var x = 0o3_77_777_777_777_777_777", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 0O377777777777777777", parserOptions: { ecmaVersion: 6 } },
"var x = 0377777777777777777",

"var x = 0377777777777777777",
"var x = 0x1FFFFFFFFFFFFF",
"var x = 0X1FFFFFFFFFFFFF",
"var x = true",
Expand All @@ -65,8 +84,10 @@ ruleTester.run("no-loss-of-precision", rule, {
"var x = {}",
"var x = ['a', 'b']",
"var x = new Date()",
"var x = '9007199254740993'"
"var x = '9007199254740993'",

{ code: "var x = 0x1FFF_FFFF_FFF_FFF", parserOptions: { ecmaVersion: 2021 } },
{ code: "var x = 0X1_FFF_FFFF_FFF_FFF", parserOptions: { ecmaVersion: 2021 } }
],
invalid: [
{
Expand All @@ -93,7 +114,36 @@ ruleTester.run("no-loss-of-precision", rule, {
code: "var x = -900719.9254740994",
errors: [{ messageId: "noLossOfPrecision" }]
},

{
code: "var x = 900719925474099_3",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 90_0719925_4740.9_93e3",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 9.0_0719925_474099_3e15",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = -9_00719_9254_740993",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 900_719.92_54740_994",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = -900_719.92_5474_0994",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 5123000000000000000000000000001",
errors: [{ messageId: "noLossOfPrecision" }]
Expand Down Expand Up @@ -153,7 +203,71 @@ ruleTester.run("no-loss-of-precision", rule, {
{
code: "var x = 0X20000000000001",
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 5123_00000000000000000000000000_1",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = -5_12300000000000000000000_0000001",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 123_00000000000000000000_00.0_0",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 1.0_00000000000000000_0000123",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 174_980057982_640953949800178169_409709228253554471456994_914061648512796239935950073857881054_1618443059_2",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 2e9_99",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = .1_23000000000000_00000_0000_0",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 0b1_0000000000000000000000000000000000000000000000000000_1",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 0B10000000000_0000000000000000000000000000_000000000000001",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 0o4_00000000000000_001",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 0O4_0000000000000000_1",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 0x2_0000000000001",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
},
{
code: "var x = 0X200000_0000000_1",
parserOptions: { ecmaVersion: 2021 },
errors: [{ messageId: "noLossOfPrecision" }]
}

]
});

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