slack-message-parser/script/combinator.js

Parser for Slack message

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.topOfLine = exports.explicit = exports.regexp = exports.oneOrMore = exports.or = void 0;
const or = (parsers) => {
    const { length } = parsers;
    return (text, position, rootParser) => {
        for (let i = 0; i < length; i++) {
            const match = parsers[i](text, position, rootParser);
            if (match) {
                return match;
            }
        }
        return null;
    };
};
exports.or = or;
const oneOrMore = (parser, andThen) => {
    const rec = (text, position, rootParser) => {
        const match = parser(text, position, rootParser);
        if (!match) {
            return [];
        }
        const [, nextPosition] = match;
        return [match, ...rec(text, nextPosition, rootParser)];
    };
    return (text, position, rootParser) => {
        const ret = rec(text, position, rootParser);
        if (ret.length === 0) {
            return null;
        }
        const [, lastPosition] = ret[ret.length - 1];
        return [andThen(ret.map(([a]) => a)), lastPosition];
    };
};
exports.oneOrMore = oneOrMore;
const regexp = (pattern, callback) => (text, position, parseText) => {
    const match = text.substring(position).match(pattern);
    if (!match) {
        return null;
    }
    return callback(match, text, position, parseText);
};
exports.regexp = regexp;
const explicit = (parser) => (text, position, parseText) => {
    const prevChar = text.charAt(position - 1);
    if (prevChar && !prevChar.match(/[\s.,([{!?\-=]/)) {
        return null;
    }
    return parser(text, position, parseText);
};
exports.explicit = explicit;
const topOfLine = (parser) => (text, position, parseText) => {
    if (position > 0 && text.charAt(position - 1) !== "\n") {
        return null;
    }
    return parser(text, position, parseText);
};
exports.topOfLine = topOfLine;