(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define(["require", "exports"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.joinExpression = exports.splitExpression = exports.escapeCode = void 0;
    const OPEN_BRACKET = /(?<escape>\\|)(?<brackets>\{\{)/;
    const CLOSE_BRACKET = /(?<escape>\\|)(?<brackets>\}\})/;
    const escapeCode = (text) => {
        return text.replace('\\}}', '}}');
    };
    exports.escapeCode = escapeCode;
    const splitExpression = (expression) => {
        const chunks = [];
        let searchingFor = 'open';
        let activeRegex = OPEN_BRACKET;
        let buffer = '';
        let index = 0;
        while (index < expression.length) {
            const expr = expression.slice(index);
            const res = activeRegex.exec(expr);
            // No more brackets. If it's a closing bracket
            // this is sort of valid so we accept it but mark
            // that it has no closing bracket.
            if (!res?.groups) {
                buffer += expr;
                if (searchingFor === 'open') {
                    chunks.push({
                        type: 'text',
                        text: buffer,
                    });
                }
                else {
                    chunks.push({
                        type: 'code',
                        text: (0, exports.escapeCode)(buffer),
                        hasClosingBrackets: false,
                    });
                }
                break;
            }
            if (res.groups.escape) {
                buffer += expr.slice(0, res.index + 3);
                index += res.index + 3;
            }
            else {
                buffer += expr.slice(0, res.index);
                if (searchingFor === 'open') {
                    chunks.push({
                        type: 'text',
                        text: buffer,
                    });
                    searchingFor = 'close';
                    activeRegex = CLOSE_BRACKET;
                }
                else {
                    chunks.push({
                        type: 'code',
                        text: (0, exports.escapeCode)(buffer),
                        hasClosingBrackets: true,
                    });
                    searchingFor = 'open';
                    activeRegex = OPEN_BRACKET;
                }
                index += res.index + 2;
                buffer = '';
            }
        }
        return chunks;
    };
    exports.splitExpression = splitExpression;
    // Expressions only have closing brackets escaped
    const escapeTmplExpression = (part) => {
        return part.replace('}}', '\\}}');
    };
    const joinExpression = (parts) => {
        return parts
            .map((chunk) => {
            if (chunk.type === 'code') {
                return `{{${escapeTmplExpression(chunk.text)}${chunk.hasClosingBrackets ? '}}' : ''}`;
            }
            return chunk.text;
        })
            .join('');
    };
    exports.joinExpression = joinExpression;
});
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