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August 16, 2024 10:00
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| // https://github.com/evanw/esbuild/blob/main/internal/helpers/dataurl.go | |
| const CharCode = { | |
| Tab: 9, | |
| LineFeed: 10, | |
| CarriageReturn: 13, | |
| Space: 32, | |
| Hash: 35, | |
| PercentSign: 37, | |
| } | |
| function isHex(c: number) { | |
| return c >= '0'.charCodeAt(0) && c <= '9'.charCodeAt(0) || c >= 'A'.charCodeAt(0) && c <= 'F'.charCodeAt(0) || c >= 'a'.charCodeAt(0) && c <= 'f'.charCodeAt(0) | |
| } | |
| function escape(text: string) { | |
| const hex = '0123456789ABCDEF' | |
| const n = text.length | |
| let result = '' | |
| // Spaces can be safely emitted for usage like `url()`, however it should always be escaped at the end | |
| let trailingStart = n | |
| for (; trailingStart > 0; trailingStart--) { | |
| const c = text.charCodeAt(trailingStart - 1) | |
| if (c > CharCode.Space || c === CharCode.Tab || c === CharCode.LineFeed || c === CharCode.CarriageReturn) | |
| break | |
| } | |
| let runStart = 0 | |
| for (let i = 0; i < n; i++) { | |
| const c = text.charCodeAt(i) | |
| if (c === CharCode.Tab || c === CharCode.LineFeed || c === CharCode.CarriageReturn || c === CharCode.Hash | |
| || i >= trailingStart | |
| || (c === CharCode.PercentSign && i + 2 < n && isHex(text.charCodeAt(i + 1)) && isHex(text.charCodeAt(i + 2))) | |
| ) { | |
| if (runStart < i) | |
| result += text.slice(runStart, i) | |
| result += `%${hex[c >> 4]}${hex[c & 15]}` | |
| runStart = i + 1 | |
| } | |
| } | |
| if (runStart < n) | |
| result += text.slice(runStart) | |
| return result | |
| } |
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