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feat: support /* v8 ignore ignore hints (#228)
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@AriPerkkio
AriPerkkio committed Nov 22, 2023
1 parent 0a44bda commit f8757c0
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Showing 3 changed files with 104 additions and 99 deletions.
14 changes: 8 additions & 6 deletions README.md
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Expand Up @@ -40,21 +40,23 @@ Sometimes you might find yourself wanting to ignore uncovered lines
in your application (for example, perhaps you run your tests in Linux, but
there's code that only executes on Windows).

To ignore lines, use the special comment `/* c8 ignore next */`.
To ignore lines, use the special comment `/* v8 ignore next */`.

**NOTE**: Before version `9.2.0` the ignore hint had to contain `c8` keyword, e.g. `/* c8 ignore ...`.

### ignoring the next line

```js
const myVariable = 99
/* c8 ignore next */
/* v8 ignore next */
if (process.platform === 'win32') console.info('hello world')
```

### ignoring the next N lines

```js
const myVariable = 99
/* c8 ignore next 3 */
/* v8 ignore next 3 */
if (process.platform === 'win32') {
console.info('hello world')
}
Expand All @@ -63,18 +65,18 @@ if (process.platform === 'win32') {
### ignoring all lines until told

```js
/* c8 ignore start */
/* v8 ignore start */
function dontMindMe() {
// ...
}
/* c8 ignore stop */
/* v8 ignore stop */
```

### ignoring the same line as the comment

```js
const myVariable = 99
const os = process.platform === 'darwin' ? 'OSXy' /* c8 ignore next */ : 'Windowsy'
const os = process.platform === 'darwin' ? 'OSXy' /* v8 ignore next */ : 'Windowsy'
```

## Testing
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9 changes: 5 additions & 4 deletions lib/source.js
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Expand Up @@ -47,26 +47,27 @@ module.exports = class CovSource {
* c8 ignore next 3
* c8 ignore start
* c8 ignore stop
* And equivalent ones for v8, e.g. v8 ignore next.
* @param {string} lineStr
* @return {{count?: number, start?: boolean, stop?: boolean}|undefined}
*/
_parseIgnore (lineStr) {
const testIgnoreNextLines = lineStr.match(/^\W*\/\* c8 ignore next (?<count>[0-9]+)/)
const testIgnoreNextLines = lineStr.match(/^\W*\/\* [c|v]8 ignore next (?<count>[0-9]+)/)
if (testIgnoreNextLines) {
return { count: Number(testIgnoreNextLines.groups.count) }
}

// Check if comment is on its own line.
if (lineStr.match(/^\W*\/\* c8 ignore next/)) {
if (lineStr.match(/^\W*\/\* [c|v]8 ignore next/)) {
return { count: 1 }
}

if (lineStr.match(/\/\* c8 ignore next/)) {
if (lineStr.match(/\/\* [c|v]8 ignore next/)) {
// Won't ignore successive lines, but the current line will be ignored.
return { count: 0 }
}

const testIgnoreStartStop = lineStr.match(/\/\* c8 ignore (?<mode>start|stop)/)
const testIgnoreStartStop = lineStr.match(/\/\* [c|v]8 ignore (?<mode>start|stop)/)
if (testIgnoreStartStop) {
if (testIgnoreStartStop.groups.mode === 'start') return { start: true }
if (testIgnoreStartStop.groups.mode === 'stop') return { stop: true }
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180 changes: 91 additions & 89 deletions test/source.js
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Expand Up @@ -70,101 +70,103 @@ describe('Source', () => {
})
})

describe('ignore', () => {
it('ignores the next line if /* c8 ignore next */ is on its own line', () => {
const sourceRaw = `
const a = 33
/* c8 ignore next */
const a = 99
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(false)
source.lines[2].ignore.should.equal(true)
source.lines[3].ignore.should.equal(true)
})

it('ignores the next N lines if /* c8 ignore next N */ is used', () => {
const sourceRaw = `
/* c8 ignore next 2 */
const a = 33
const a = 99
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(true)
source.lines[2].ignore.should.equal(true)
source.lines[3].ignore.should.equal(true)
})
for (const prefix of ['c8', 'v8']) {
describe(`ignore hint ${prefix}`, () => {
it(`ignores the next line if /* ${prefix} ignore next */ is on its own line`, () => {
const sourceRaw = `
const a = 33
/* ${prefix} ignore next */
const a = 99
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(false)
source.lines[2].ignore.should.equal(true)
source.lines[3].ignore.should.equal(true)
})

it('ignores a line that contains /* c8 ignore next */', () => {
const sourceRaw = `
const a = foo ? true /* c8 ignore next */ : false
const b = 99
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(true)
source.lines[2].ignore.should.equal(false)
})
it(`ignores the next N lines if /* ${prefix} ignore next N */ is used`, () => {
const sourceRaw = `
/* ${prefix} ignore next 2 */
const a = 33
const a = 99
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(true)
source.lines[2].ignore.should.equal(true)
source.lines[3].ignore.should.equal(true)
})

it('ignores lines between start and stop', () => {
const sourceRaw = `
/* c8 ignore start */
function ignoreMe() {
// ...
}
/* c8 ignore stop */
function doNotIgnoreMe() {
// ...
}
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(true)
source.lines[2].ignore.should.equal(true)
source.lines[3].ignore.should.equal(true)
source.lines[4].ignore.should.equal(true)
source.lines[5].ignore.should.equal(true)
source.lines[6].ignore.should.equal(false)
source.lines[7].ignore.should.equal(false)
source.lines[8].ignore.should.equal(false)
source.lines[9].ignore.should.equal(false)
})
it(`ignores a line that contains /* ${prefix} ignore next */`, () => {
const sourceRaw = `
const a = foo ? true /* ${prefix} ignore next */ : false
const b = 99
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(true)
source.lines[2].ignore.should.equal(false)
})

it('ignore hint accepts other text content', () => {
const sourceRaw = `
const a = 33
it('ignores lines between start and stop', () => {
const sourceRaw = `
/* ${prefix} ignore start */
function ignoreMe() {
// ...
}
/* ${prefix} ignore stop */
/* c8 ignore next -- reasoning why this is ignored */
const b = 99
function doNotIgnoreMe() {
// ...
}
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(true)
source.lines[2].ignore.should.equal(true)
source.lines[3].ignore.should.equal(true)
source.lines[4].ignore.should.equal(true)
source.lines[5].ignore.should.equal(true)
source.lines[6].ignore.should.equal(false)
source.lines[7].ignore.should.equal(false)
source.lines[8].ignore.should.equal(false)
source.lines[9].ignore.should.equal(false)
})

/* c8 ignore start: reasoning here */
function ignoreMe() {
// ...
}
/* c8 ignore stop -- @preserve */
it('ignore hint accepts other text content', () => {
const sourceRaw = `
const a = 33
const c = a ? true /* c8 ignore next reasoning here */ : false
/* ${prefix} ignore next -- reasoning why this is ignored */
const b = 99
/* c8 ignore next 2 -- ignores next two lines */
const a = 33
const a = 99
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(false)
source.lines[2].ignore.should.equal(false)
source.lines[3].ignore.should.equal(true)
source.lines[4].ignore.should.equal(true)
source.lines[5].ignore.should.equal(false)
source.lines[6].ignore.should.equal(true)
source.lines[7].ignore.should.equal(true)
source.lines[8].ignore.should.equal(true)
source.lines[9].ignore.should.equal(true)
source.lines[10].ignore.should.equal(true)
source.lines[11].ignore.should.equal(false)
source.lines[12].ignore.should.equal(true)
source.lines[13].ignore.should.equal(false)
source.lines[14].ignore.should.equal(true)
source.lines[15].ignore.should.equal(true)
source.lines[16].ignore.should.equal(true)
/* ${prefix} ignore start: reasoning here */
function ignoreMe() {
// ...
}
/* ${prefix} ignore stop -- @preserve */
const c = a ? true /* ${prefix} ignore next reasoning here */ : false
/* ${prefix} ignore next 2 -- ignores next two lines */
const a = 33
const a = 99
`
const source = new CovSource(sourceRaw, 0)
source.lines[1].ignore.should.equal(false)
source.lines[2].ignore.should.equal(false)
source.lines[3].ignore.should.equal(true)
source.lines[4].ignore.should.equal(true)
source.lines[5].ignore.should.equal(false)
source.lines[6].ignore.should.equal(true)
source.lines[7].ignore.should.equal(true)
source.lines[8].ignore.should.equal(true)
source.lines[9].ignore.should.equal(true)
source.lines[10].ignore.should.equal(true)
source.lines[11].ignore.should.equal(false)
source.lines[12].ignore.should.equal(true)
source.lines[13].ignore.should.equal(false)
source.lines[14].ignore.should.equal(true)
source.lines[15].ignore.should.equal(true)
source.lines[16].ignore.should.equal(true)
})
})
})
}
})

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