46 lines
1.2 KiB
TypeScript
46 lines
1.2 KiB
TypeScript
// deno-fmt-ignore
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const charVal: {[key: string]: number} = {
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"0": 0, "1": 1, "2": 2, "3": 3,
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"4": 4, "5": 5, "6": 6, "7": 7,
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"8": 8, "9": 9, "a": 10, "b": 11,
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"c": 12, "d": 13, "e": 14, "f": 15,
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};
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const base2Digits = ["0", "1"];
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const base8Digits = [...base2Digits, "2", "3", "4", "5", "6", "7"];
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const base10Digits = [...base8Digits, "8", "9"];
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const base16Digits = [...base10Digits, "a", "b", "c", "d", "e", "f"];
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export function stringToInt(text: string): number {
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if (text.length === 0) {
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return NaN;
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}
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if (text[0] === "0") {
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if (text.length === 1) {
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return 0;
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} else if (text[1] == "b") {
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return parseDigits(text.slice(2), 2, base2Digits);
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} else if (text[1] == "x") {
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return parseDigits(text.slice(2), 16, base16Digits);
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} else {
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return parseDigits(text.slice(1), 8, base8Digits);
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}
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}
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return parseDigits(text, 10, base10Digits);
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}
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function parseDigits(
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numberText: string,
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base: number,
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digitSet: string[],
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): number {
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let value = 0;
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for (const ch of numberText) {
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value *= base;
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if (!digitSet.includes(ch)) {
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return NaN;
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}
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value += charVal[ch];
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}
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return value;
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}
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