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60 lines
1.7 KiB
TypeScript
60 lines
1.7 KiB
TypeScript
import { getSequenceFromEmojiStringOrKeyword } from '../cleanup';
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import { convertEmojiSequenceToUTF32 } from '../convert';
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import { getQualifiedEmojiVariations } from '../test/variations';
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import { createEmojisTree, parseEmojiTree } from './tree';
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/**
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* Create optimised regex
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*/
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export function createOptimisedRegexForEmojiSequences(
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sequences: number[][]
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): string {
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// Convert to UTF-32
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sequences = sequences.map((item) => convertEmojiSequenceToUTF32(item));
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// Create tree
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const tree = createEmojisTree(sequences);
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// Optimise
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const regex = parseEmojiTree(tree);
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// Return regex
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return regex.regex;
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}
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/**
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* Create optimised regex for emojis
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*
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* First parameter is array of emojis, entry can be either list of
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* code points or emoji sequence as a string
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*
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* Examples of acceptable strings (case insensitive):
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* '1F636 200D 1F32B FE0F' - space separated UTF32 sequence
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* '1f636-200d-1f32b-fe0f' - dash separated UTF32 sequence
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* 'd83d-de36-200d-d83c-df2b-fe0f' - dash separated UTF16 sequence
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* '\\uD83D\\uDE36\\u200D\\uD83C\\uDF2B\\uFE0F' - UTF16 sequence escaped with '\\u'
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*
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* All examples above refer to the same emoji and will generate the same regex result
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*/
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export function createOptimisedRegex(emojis: (string | number[])[]): string {
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// Convert to numbers
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let sequences = emojis.map((item) =>
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typeof item === 'string'
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? getSequenceFromEmojiStringOrKeyword(item)
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: item
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);
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// Add variations
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// Temporary convert to object with 'sequence' property
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sequences = getQualifiedEmojiVariations(
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sequences.map((sequence) => {
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return {
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sequence,
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};
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})
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).map((item) => item.sequence);
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// Parse
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return createOptimisedRegexForEmojiSequences(sequences);
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}
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