142 lines
4.5 KiB
Markdown
142 lines
4.5 KiB
Markdown
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# anynum
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Normalize Unicode decimal digits and minus signs to ASCII.
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Converts digits from any script — Devanagari, Arabic-Indic, Thai, Bengali, Fullwidth, and [50+ others](#supported-scripts) — to their ASCII equivalents (`0`–`9`). Also normalizes Unicode minus variants (`−`, `－`, `﹣`) to ASCII `-`.
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Pairs naturally with [`strnum`](https://github.com/nicolo-ribaudo/strnum) — use `anynum` to normalize first, then `strnum` to detect the numeric type.
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```js
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import anynum from 'anynum';
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anynum('१२.३४') // → '12.34' (Devanagari)
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anynum('٣٫١٤') // → '3.14' (Arabic-Indic)
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anynum('−४२') // → '-42' (Unicode minus + Devanagari)
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anynum('－９９.５') // → '-99.5' (Fullwidth minus + Fullwidth digits)
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anynum('hello') // → 'hello' (no digits — zero allocation)
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anynum('100') // → '100' (already ASCII — zero allocation)
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```
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---
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## Install
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```bash
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npm install anynum
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```
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---
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## Usage
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```js
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// ESM
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import anynum from 'anynum';
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import { anynum } from 'anynum';
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```
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### API
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```ts
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anynum(str: string): string
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```
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- Accepts a `string`, returns a `string`.
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- Non-string values are returned as-is (no throw).
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- Non-digit characters pass through unchanged.
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- If no conversion is needed, the **original string is returned** (zero allocation).
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---
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## What gets converted
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### Decimal digits
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Any Unicode character in category `Nd` (decimal digit) is mapped to its ASCII equivalent. This covers all positional decimal digit scripts — every script whose digits represent `0`–`9` by position.
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```js
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anynum('๑๒๓') // Thai → '123'
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anynum('੧੨੩') // Gurmukhi → '123'
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anynum('᠑᠒᠓') // Mongolian → '123'
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anynum('𝟏𝟐𝟑') // Math Bold → '123'
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```
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### Unicode minus variants
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Three Unicode characters are normalized to ASCII `-` (`U+002D`):
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| Code point | Character | Name |
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|---|---|---|
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| `U+2212` | `−` | MINUS SIGN (mathematical) |
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| `U+FF0D` | `－` | FULLWIDTH HYPHEN-MINUS |
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| `U+FE63` | `﹣` | SMALL HYPHEN-MINUS |
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Dashes used for punctuation — EN DASH (`–`), EM DASH (`—`), HYPHEN (`‐`) — are intentionally **not** converted.
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```js
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anynum('−42') // U+2212 MINUS SIGN → '-42'
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anynum('－42') // U+FF0D FULLWIDTH → '-42'
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anynum('–42') // U+2013 EN DASH → '–42' (unchanged)
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```
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---
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## Use with strnum
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`anynum` and `strnum` compose cleanly:
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```js
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import anynum from 'anynum';
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import strnum from 'strnum';
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strnum(anynum('१२.३४')) // → 12.34 (number, float)
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strnum(anynum('−४२')) // → '-42' (string; strnum handles sign detection)
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strnum(anynum('hello')) // → 'hello'
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```
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---
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## Supported scripts
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50+ decimal digit scripts from Unicode `Nd` category, including:
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| Script | Zero | Sample |
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|---|---|---|
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| Devanagari (Hindi/Marathi/Nepali) | `U+0966` | `०१२३४५६७८९` |
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| Arabic-Indic | `U+0660` | `٠١٢٣٤٥٦٧٨٩` |
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| Extended Arabic-Indic (Urdu/Persian) | `U+06F0` | `۰۱۲۳۴۵۶۷۸۹` |
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| Bengali | `U+09E6` | `০১২৩৪৫৬৭৮৯` |
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| Gurmukhi | `U+0A66` | `੦੧੨੩੪੫੬੭੮੯` |
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| Gujarati | `U+0AE6` | `૦૧૨૩૪૫૬૭૮૯` |
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| Odia | `U+0B66` | `୦୧୨୩୪୫୬୭୮୯` |
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| Tamil | `U+0BE6` | `௦௧௨௩௪௫௬௭௮௯` |
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| Telugu | `U+0C66` | `౦౧౨౩౪౫౬౭౮౯` |
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| Kannada | `U+0CE6` | `೦೧೨೩೪೫೬೭೮೯` |
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| Malayalam | `U+0D66` | `൦൧൨൩൪൫൬൭൮൯` |
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| Thai | `U+0E50` | `๐๑๒๓๔๕๖๗๘๙` |
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| Lao | `U+0ED0` | `໐໑໒໓໔໕໖໗໘໙` |
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| Tibetan | `U+0F20` | `༠༡༢༣༤༥༦༧༨༩` |
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| Myanmar | `U+1040` | `၀၁၂၃၄၅၆၇၈၉` |
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| Khmer | `U+17E0` | `០១២៣៤៥៦៧៨៩` |
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| Mongolian | `U+1810` | `᠐᠑᠒᠓᠔᠕᠖᠗᠘᠙` |
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| Fullwidth (CJK context) | `U+FF10` | `０１２３４５６７８９` |
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| Mathematical Bold | `U+1D7CE` | `𝟎𝟏𝟐𝟑𝟒𝟓𝟔𝟕𝟖𝟗` |
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| Adlam | `U+1E950` | `𞥐𞥑𞥒𞥓𞥔𞥕𞥖𞥗𞥘𞥙` |
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| … and 30+ more | | |
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---
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## What it does NOT convert
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- **Kanji/Chinese numeral words** (`三`, `百`, `万`) — these are ideographic numerals, not decimal digits. Each language has its own positional system requiring separate parsing logic.
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- **Roman numerals** (`Ⅳ`, `Ⅻ`) — not decimal digits.
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- **Punctuation dashes** (`–` EN, `—` EM, `‐` HYPHEN) — not numeric signs.
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- **Decimal separators** — commas, periods, Arabic decimal comma (`٫`) are passed through as-is. Separator normalization is the caller's responsibility.
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---
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## License
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MIT
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