@github/template-parts/lib/template-string-parser.js

An implementation of the TemplateInstance proposal (https://github.com/w3c/webcomponents/blob/159b1600bab02fe9cd794825440a98537d53b389/proposals/Template-Instantiation.md)

const mem = new Map();
export function parse(text) {
    if (mem.has(text))
        return mem.get(text);
    const length = text.length;
    let lastPos = 0;
    let tokenStart = 0;
    let open = 0;
    const items = [];
    for (let i = 0; i < length; i += 1) {
        const char = text[i];
        const lookAhead = text[i + 1];
        const lookBehind = text[i - 1];
        if (char === '{' && lookAhead === '{' && lookBehind !== '\\') {
            open += 1;
            if (open === 1)
                tokenStart = i;
            i += 1;
        }
        else if (char === '}' && lookAhead === '}' && lookBehind !== '\\' && open) {
            open -= 1;
            if (open === 0) {
                if (tokenStart > lastPos) {
                    items.push(Object.freeze({
                        type: 'string',
                        start: lastPos,
                        end: tokenStart,
                        value: text.slice(lastPos, tokenStart),
                    }));
                    lastPos = tokenStart;
                }
                items.push(Object.freeze({
                    type: 'part',
                    start: tokenStart,
                    end: i + 2,
                    value: text.slice(lastPos + 2, i).trim(),
                }));
                i += 1;
                lastPos = i + 1;
            }
        }
    }
    if (lastPos < length)
        items.push(Object.freeze({ type: 'string', start: lastPos, end: length, value: text.slice(lastPos, length) }));
    mem.set(text, Object.freeze(items));
    return mem.get(text);
}
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