crazy-parser/src/void.js

A light-weight parser combinator

import { Parser } from "./index";
export function char(c) {
    return new Parser((input, state) => {
        if (state.index >= input.length)
            return new Error();
        const char = String.fromCodePoint(input[state.index]);
        if (char != c)
            return new Error();
        state.index += 1;
    });
}
export function str(s) {
    const buffer = Uint32Array.from(Array.from(s).map(c => c.codePointAt(0)));
    return new Parser((input, state) => {
        if (state.index + buffer.length > input.length)
            return new Error();
        for (let i = 0; i < buffer.length; i += 1)
            if (input[state.index + i] != buffer[i])
                return new Error();
        state.index += buffer.length;
    });
}