Nlcst-search NPM

nlcst-search

nlcst utility to search for phrases in a tree.

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 16+), install with npm:

npm install nlcst-search

In Deno with esm.sh:

import {search} from 'https://esm.sh/nlcst-search@4'

In browsers with esm.sh:

<script type="module">
  import {search} from 'https://esm.sh/nlcst-search@4?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[, options])`

Search for phrases in a tree.

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).

Parameters

tree (Node) — tree to search
phrases (Array<string>) — phrases to search for
handler (Handler) — handle a match
options (Options) — configuration

Returns

Nothing (undefined).

`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 (undefined).

`Options`

Configuration (TypeScript type).

Fields

allowApostrophes (boolean, default: false) — passed to nlcst-normalize
allowDashes (boolean, default: false) — passed to nlcst-normalize
allowLiterals (boolean, default: false) — include literal phrases

Types

This package is fully typed with TypeScript. It exports the additional types Handler and Options.

Compatibility

Projects maintained by the unified collective are compatible with maintained versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of Node. This means we try to keep the current release line, nlcst-search@^4, compatible with Node.js 16.