pinetto/dist/printf/printf.js

Isomorphic, opinionated logging library focusing on simplicity and readability. Supports child loggers.

/*
 * Initially vendored from the "fast-printf" package
 * by Gajus Kuizinas, released under the BSD-3-Clause license,
 * at commit 8372e5cbc7d4f16a655fd4c42077db0147c077af.
 *
 * https://github.com/gajus/fast-printf/blob/8372e5cbc7d4f16a655fd4c42077db0147c077af
 */
import { boolean } from './boolean.js';
import { tokenize } from './tokenize.js';
const padValue = (value, width, flag) => {
    if (flag === '-') {
        return value.padEnd(width, ' ');
    }
    else if (flag === '-+') {
        return ((Number(value) >= 0 ? '+' : '') + value).padEnd(width, ' ');
    }
    else if (flag === '+') {
        return ((Number(value) >= 0 ? '+' : '') + value).padStart(width, ' ');
    }
    else if (flag === '0') {
        return value.padStart(width, '0');
    }
    else {
        return value.padStart(width, ' ');
    }
};
const cache = {};
export const printf = (subject, boundValues) => {
    let tokens = cache[subject];
    if (!tokens) {
        tokens = cache[subject] = tokenize(subject);
    }
    let result = '';
    for (const token of tokens) {
        if (token.type === 'literal') {
            result += token.literal;
        }
        else {
            let boundValue = boundValues[token.position];
            if (typeof boundValue === 'function') {
                boundValue = boundValue();
            }
            if (boundValue === undefined) {
                result += token.placeholder;
            }
            else if (token.conversion === 'b') {
                result += boolean(boundValue) ? 'true' : 'false';
            }
            else if (token.conversion === 'B') {
                result += boolean(boundValue) ? 'TRUE' : 'FALSE';
            }
            else if (token.conversion === 'c') {
                result += boundValue;
            }
            else if (token.conversion === 'C') {
                result += String(boundValue).toUpperCase();
            }
            else if (token.conversion === 'i' || token.conversion === 'd') {
                boundValue = String(Math.trunc(boundValue));
                if (token.width !== null) {
                    boundValue = padValue(boundValue, token.width, token.flag);
                }
                result += boundValue;
            }
            else if (token.conversion === 'e') {
                result += Number(boundValue)
                    .toExponential();
            }
            else if (token.conversion === 'E') {
                result += Number(boundValue)
                    .toExponential()
                    .toUpperCase();
            }
            else if (token.conversion === 'f') {
                if (token.precision !== null) {
                    boundValue = Number(boundValue).toFixed(token.precision);
                }
                if (token.width !== null) {
                    boundValue = padValue(String(boundValue), token.width, token.flag);
                }
                result += boundValue;
            }
            else if (token.conversion === 'o') {
                result += (Number.parseInt(String(boundValue), 10) >>> 0).toString(8);
            }
            else if (token.conversion === 's') {
                if (token.width !== null) {
                    boundValue = padValue(String(boundValue), token.width, token.flag);
                }
                result += boundValue;
            }
            else if (token.conversion === 'S') {
                if (token.width !== null) {
                    boundValue = padValue(String(boundValue), token.width, token.flag);
                }
                result += String(boundValue).toUpperCase();
            }
            else if (token.conversion === 'u') {
                result += Number.parseInt(String(boundValue), 10) >>> 0;
            }
            else if (token.conversion === 'x') {
                boundValue = (Number.parseInt(String(boundValue), 10) >>> 0).toString(16);
                if (token.width !== null) {
                    boundValue = padValue(String(boundValue), token.width, token.flag);
                }
                result += boundValue;
            }
            else {
                throw new Error('Unknown format specifier.');
            }
        }
    }
    return result;
};
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