vitaly-z/nlcst-search

utility to search for patterns in an nlcst tree

nlcst-search

nlcst utility to search for phrases in a tree.

Contents

• What is this?
• When should I use this?
• Install
• Use
• API
  • search(tree, phrases, handler[, allowApostrophes|options])
  • Handler
  • Options
  • PhrasesList
  • PhrasesMap
• Types
• Compatibility
• Related
• Contribute
• License

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 only. In Node.js (version 14.14+ and 16.0+), install with npm:

npm install nlcst-search

In Deno with esm.sh:

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

In browsers with esm.sh:

<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 search. There is no default export.

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

Search for phrases in a tree.

Parameters

• tree (Node) — tree to search
• phrases (PhrasesList or PhrasesMap) — phrases to search for
• handler (Handler) — handle a match
• allowApostrophes (boolean) — shortcut for options of {allowApostrophes: boolean}
• options (Options) — configuration

Returns

Nothing (void).

Handler

Handle a match (TypeScript type).

Parameters

• nodes (Array<Node>) — match
• index (number) — index of first node of nodes in parent
• parent (Node) — parent of nodes
• phrase (string) — the phrase that matched

Returns

Nothing (void).

Options

Configuration (TypeScript type).

Fields

allowApostrophes

Passed to nlcst-normalize (boolean, default: false).

allowDashes

Passed to nlcst-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 normalized 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 Handler, Options, PhrasesList, and PhrasesMap.

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

• nlcst-normalize — normalize a word for easier comparison
• nlcst-is-literal — check whether a node is meant literally

Contribute

See contributing.md in syntax-tree/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MIT © Titus Wormer