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pct.ts
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pct.ts
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const RESERVED = [
":",
"/",
"?",
"#",
"[",
"]",
"@",
"!",
"$",
"&",
"(",
")",
"*",
"+",
",",
";",
"=",
"'",
];
function isAlpha(char: string): boolean {
return (char >= "a" && char <= "z") || ((char >= "A" && char <= "Z"));
}
function isDigit(char: string): boolean {
return char >= "0" && char <= "9";
}
function pctEncodeChar(char: string) {
const charCode = char.charCodeAt(0);
const encoded: number[] = [];
if (charCode < 128) {
encoded.push(charCode);
} else if ((128 <= charCode && charCode < 2048)) {
encoded.push((charCode >> 6) | 192);
encoded.push((charCode & 63) | 128);
} else {
encoded.push((charCode >> 12) | 224);
encoded.push(((charCode >> 6) & 63) | 128);
encoded.push((charCode & 63) | 128);
}
return encoded.map((char) => `%${char.toString(16).toUpperCase()}`).join("");
}
export interface PctEncodeOptions {
allowReserved: boolean;
}
function pctEncode(
input: string,
{ allowReserved }: PctEncodeOptions,
): string {
const {
prototype: {
map,
},
} = Array;
return map.call(input, (char: string): string => {
if (
isAlpha(char) ||
isDigit(char) ||
["-", ".", "_", "~"].includes(char) ||
allowReserved && RESERVED.includes(char)
) {
return char;
}
return pctEncodeChar(char);
}).join("");
}
export { pctEncode, pctEncodeChar };