nlcst-search

nlcst utility to search for patterns in a tree

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nlcst-search
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nlcst utility to search for phrases in a tree.

Contents

*   [`search(tree, phrases, handler[, allowApostrophes|options])`](#searchtree-phrases-handler-allowapostrophesoptions)
*   [`Handler`](#handler)
*   [`Options`](#options)
*   [`PhrasesList`](#phraseslist)
*   [`PhrasesMap`](#phrasesmap)

What is this?

This utility can search for phrases (words and phrases) in trees.

When should I use this?

This package is a tiny utility that helps when you’re searching for words and phrases.

Install

This package is ESM onlyesm. In Node.js (version 14.14+ and 16.0+), install with npm:
npm install nlcst-search

In Deno with esm.shesmsh:
import {search} from 'https://esm.sh/nlcst-search@3'

In browsers with esm.shesmsh:
<script type="module">
  import {search} from 'https://esm.sh/nlcst-search@3?bundle'
</script>

Use

import {search} from 'nlcst-search'
import {toString} from 'nlcst-to-string'

const tree = {
  type: 'SentenceNode',
  children: [
    {
      type: 'WordNode',
      children: [
        {type: 'TextNode', value: 'Don'},
        {type: 'PunctuationNode', value: '’'},
        {type: 'TextNode', value: 't'}
      ]
    },
    {type: 'WhiteSpaceNode', value: ' '},
    {
      type: 'WordNode',
      children: [{type: 'TextNode', value: 'do'}]
    },
    {type: 'WhiteSpaceNode', value: ' '},
    {
      type: 'WordNode',
      children: [
        {type: 'TextNode', value: 'Block'},
        {type: 'PunctuationNode', value: '-'},
        {type: 'TextNode', value: 'level'}
      ]
    }
  ]
}

search(tree, ['dont'], function(nodes) {
  console.log(toString(nodes))
})
// `Don’t`

search(tree, ['do blocklevel'], function(nodes) {
  console.log(toString(nodes))
})
// `do Block-level`

API

This package exports the identifier searchsearch. There is no default export.

search(tree, phrases, handler[, allowApostrophes|options])

Search for phrases in a tree.
Parameters
— tree to search
— phrases to search for
— handle a match
  • allowApostrophes (boolean)
— shortcut for `options` of `{allowApostrophes: boolean}`
— configuration
Returns
Nothing (void).

Handler

Handle a match (TypeScript type).
Parameters
— match
  • index (number)
— index of first node of `nodes` in `parent`
— parent of `nodes`
  • phrase (string)
— the phrase that matched
Returns
Nothing (void).

Options

Configuration (TypeScript type).
Fields
allowApostrophes
Passed to nlcst-normalizenlcst-normalize (boolean, default: false).
allowDashes
Passed to nlcst-normalizenlcst-normalize (boolean, default: false).
allowLiterals
Include literal phrases (boolean, default: false).

PhrasesList

List of phrases (TypeScript type).
Each phrase is a space-separated list of words, where each word will be normalizednlcst-normalize to remove casing, apostrophes, and dashes. Spaces in a pattern mean one or more whitespace nodes in the tree. Instead of a word with letters, it’s also possible to use a wildcard symbol (*, an asterisk) which will match any word in a pattern (alpha * charlie).
Type
type PhrasesList = Array<string>

PhrasesMap

Map of phrases (TypeScript type).
Type
type PhrasesMap = Record<string, unknown>

Types

This package is fully typed with TypeScript. It exports the additional types Handlerhandler, Optionsoptions, PhrasesListphraseslist, and PhrasesMapphrasesmap.

Compatibility

Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 14.14+ and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.

Related

— normalize a word for easier comparison
— check whether a node is meant literally

Contribute

See contributing.mdcontributing in syntax-tree/.githubhealth for ways to get started. See support.mdsupport for ways to get help.
This project has a code of conductcoc. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MITlicense © Titus Wormerauthor