viem/_esm/utils/hash/normalizeSignature.js

TypeScript Interface for Ethereum

import { BaseError } from '../../errors/base.js';
export function normalizeSignature(signature) {
    let active = true;
    let current = '';
    let level = 0;
    let result = '';
    let valid = false;
    for (let i = 0; i < signature.length; i++) {
        const char = signature[i];
        // If the character is a separator, we want to reactivate.
        if (['(', ')', ','].includes(char))
            active = true;
        // If the character is a "level" token, we want to increment/decrement.
        if (char === '(')
            level++;
        if (char === ')')
            level--;
        // If we aren't active, we don't want to mutate the result.
        if (!active)
            continue;
        // If level === 0, we are at the definition level.
        if (level === 0) {
            if (char === ' ' && ['event', 'function', ''].includes(result))
                result = '';
            else {
                result += char;
                // If we are at the end of the definition, we must be finished.
                if (char === ')') {
                    valid = true;
                    break;
                }
            }
            continue;
        }
        // Ignore spaces
        if (char === ' ') {
            // If the previous character is a separator, and the current section isn't empty, we want to deactivate.
            if (signature[i - 1] !== ',' && current !== ',' && current !== ',(') {
                current = '';
                active = false;
            }
            continue;
        }
        result += char;
        current += char;
    }
    if (!valid)
        throw new BaseError('Unable to normalize signature.');
    return result;
}
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