ropo v2.25.0
String replacement utilities with support for both synchronous and asynchronous replacements. Supports replacing regular expressions, HTML Elements, and comment elements. Compatible with async/await.
ropo
isreplace
in Yoruba
Usage
import { strictEqual } from 'assert'
import {
extractAttribute,
replaceSync,
replaceAsync,
replaceElementSync,
replaceElementAsync,
} from 'ropo'
async function main() {
// uppercase `bc` of `abcd`
console.log(
replaceSync('abcd', /bc/, function ({ content }) {
return content.toUpperCase()
}),
)
// => aBCd
// uppercase `bc` of `abcd` asynchronously
console.log(
await replaceAsync('abcd', /bc/, function ({ content }) {
return new Promise(function (resolve) {
process.nextTick(function () {
resolve(content.toUpperCase())
})
})
}),
)
// => aBCd
// use a RegExp named capture group to allow the inversion of content between BEGIN and END
// https://github.com/tc39/proposal-regexp-named-groups
console.log(
replaceSync(
'hello BEGIN good morning END world',
new RegExp('BEGIN (?<inside>.+?) END'),
function (section, captures) {
strictEqual(section.outer, 'BEGIN good morning END')
strictEqual(section.inner, null)
strictEqual(section.content, section.outer)
return captures.inside.split('').reverse().join('')
},
),
)
// => hello gninrom doog world
// for convenience, and some extra magic (magic explained in next example) we can call `inside` `inner` to have it used as a section
console.log(
replaceSync(
'hello BEGIN good morning END world',
new RegExp('BEGIN (?<inner>.+?) END'),
function (section, captures) {
strictEqual(section.outer, 'BEGIN good morning END')
strictEqual(section.inner, captures.inner)
strictEqual(section.content, captures.inner)
return section.content.split('').reverse().join('')
},
),
)
// => hello gninrom doog world
// invert anything between INVERT:<N> with recursive rendering
console.log(
replaceSync(
'hello INVERT:1 good INVERT:2 guten INVERT:3 gday /INVERT:3 morgen /INVERT:2 morning /INVERT:1 world',
new RegExp('(?<element>INVERT:\\d+) (?<inner>.+?) /\\k<element>'),
function ({ content }) {
return content.split('').reverse().join('')
},
),
)
// => hello gninrom guten yadg morgen doog world
// notice how the text is replaced correctly, gday has 3 inversions applied, so it is inverted
// whereas guten morgen has 2 inversions applied, so is reset
// the ability to perform this recursive replacement is possible because if the RegExp named capture group `inner` exists,
// then ropo will perform recursion on it inner, and return the result as the `content` section
// e.g. by doing this, the initial recursion will occur on: good INVERT:2 guten INVERT:3 gday /INVERT:3 morgen /INVERT:2 morning
// then on: guten INVERT:3 gday /INVERT:3 morgen
// and finally on: gday
// without doing this, recursion would have to happen on the outer, which would cause the replacement to recur infinitely against itself
// e.g. the initial recursion would occur on: INVERT:1 good INVERT:2 guten INVERT:3 gday /INVERT:3 morgen /INVERT:2 morning /INVERT:1
// and the second on: INVERT:1 good INVERT:2 guten INVERT:3 gday /INVERT:3 morgen /INVERT:2 morning /INVERT:1
// and the third on: INVERT:1 good INVERT:2 guten INVERT:3 gday /INVERT:3 morgen /INVERT:2 morning /INVERT:1
// and so on, so no progress is made
// as such, ropo will only allow recursion when it detects the `inner` named capture group
// invert anything between INVERT:<N>, without using the `inner` named capture group
console.log(
replaceSync(
'hello INVERT:1 good INVERT:2 guten INVERT:3 gday /INVERT:3 morgen /INVERT:2 morning /INVERT:1 world',
new RegExp(
'(?<element>INVERT:\\d+) (?<whatever>.+?) /\\k<element>',
),
function (sections, { whatever }) {
return whatever.split('').reverse().join('')
},
),
)
// => hello gninrom 2:TREVNI/ negrom 3:TREVNI/ yadg 3:TREVNI netug 2:TREVNI doog world
// as we can see, recursion was correctly disabled
// if it wasn't, we would end up with an error like:
// (node:7252) UnhandledPromiseRejectionWarning: RangeError: Maximum call stack size exceeded
// and if we used the `outer` section instead of the `whatever` capture group, we would have:
// => hello 1:TREVNI/ gninrom 2:TREVNI/ negrom 3:TREVNI/ yadg 3:TREVNI netug 2:TREVNI doog 1:TREVNI world
// ropo also has built in helpers for element replacements,
// such that we only need to specify the tag name/regexp,
// and ropo handles the replacement sections and capture groups for us
// uppercase the contents of <x-uppercase>
console.log(
replaceElementSync(
'<strong>I am <x-uppercase>awesome</x-uppercase></strong>',
/x-uppercase/,
function ({ content }) {
return content.toUpperCase()
},
),
)
// => <strong>I am AWESOME</strong>
// power the numbers of <power> together
console.log(
replaceElementSync(
'<x-pow>2 <x-power>3 4</x-power> 5</x-pow>',
/x-pow(?:er)?/,
function ({ content }) {
const result = content
.split(/[\n\s]+/)
.reduce((a, b) => Math.pow(a, b))
return result
},
),
)
// => 8.263199609878108e+121
// note that this is the correct result of: 2 ^ (3 ^ 4) ^ 5
// which means, the nested element is replaced first, then the parent element, as expected
// now as replace-element is just regex based, we must ensure that nested elements have unique tags
// this can be done as above with `x-pow` and `x-power`, but can also be done via a `:<N>` suffix to the tag
console.log(
replaceElementSync(
'<x-pow>2 <x-pow:2>3 4</x-pow:2> 5</x-pow>',
/x-pow(?::\d+)?/,
function ({ content }) {
const result = content
.split(/[\n\s]+/)
.reduce((a, b) => Math.pow(a, b))
return result
},
),
)
// => 8.263199609878108e+121
// we can even fetch attributes
console.log(
replaceElementSync(
'<x-pow power=10>2</x-pow>',
/x-pow/,
function ({ content }, { attributes }) {
const power = extractAttribute(attributes, 'power')
const result = Math.pow(content, power)
return result
},
),
)
// => 1024
// and even do asynchronous replacements
console.log(
await replaceElementAsync(
'<x-readfile>example-fixture.txt</x-readfile>',
/x-readfile/,
function ({ content }) {
return require('fs').promises.readFile(content, 'utf8')
},
),
)
// => hello world from example-fixture.txt
// and with support for self-closing elements
console.log(
replaceElementSync(
'<x-pow x=2 y=3 /> <x-pow>4 6</x-pow>',
/x-pow/,
function ({ content }, { attributes }) {
const x =
extractAttribute(attributes, 'x') || content.split(' ')[0]
const y =
extractAttribute(attributes, 'y') || content.split(' ')[1]
const result = Math.pow(x, y)
return result
},
),
)
// => 8 4096
}
main()
Which results in:
aBCd
aBCd
hello gninrom doog world
hello gninrom doog world
hello gninrom guten yadg morgen doog world
hello gninrom 2:TREVNI/ negrom 3:TREVNI/ yadg 3:TREVNI netug 2:TREVNI doog world
<strong>I am AWESOME</strong>
8.263199609878108e+121
8.263199609878108e+121
1024
hello world from example-fixture.txt
8 4096
npm
Skypack
<script type="module">
import * as pkg from '//cdn.skypack.dev/ropo@^2.25.0'
</script>
unpkg
<script type="module">
import * as pkg from '//unpkg.com/ropo@^2.25.0'
</script>
jspm
<script type="module">
import * as pkg from '//dev.jspm.io/ropo@2.25.0'
</script>
Discover the release history by heading on over to the HISTORY.md file.
Discover how you can contribute by heading on over to the CONTRIBUTING.md file.
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These amazing people have contributed code to this project:
Discover how you can contribute by heading on over to the CONTRIBUTING.md file.
Unless stated otherwise all works are:
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