element-vir/dist/util/lit-template.js

Heroic. Reactive. Declarative. Type safe. Web components without compromise.

import { collapseWhiteSpace } from '@augment-vir/common';
/**
 * Converts an HTML or SVG template into a raw string.
 *
 * @category Util
 */
export function convertTemplateToString(template) {
    if ('templateString' in template) {
        return template.templateString;
    }
    const { strings, values } = template;
    if (!strings?.length && !values?.length) {
        return '';
    }
    const valueList = [
        ...(values || []),
        '', // this last empty string is so it's easier to deal with indexes
    ];
    const stringsList = strings ?? [''];
    const all = stringsList.map((stringValue, index) => {
        const value = extractValue(stringValue, valueList[index]);
        return `${stringValue}${value}`;
    });
    return collapseWhiteSpace(all.join(''));
}
function extractValue(previousString, value) {
    if (value._$litType$ != undefined || value._$litDirective$ != undefined) {
        // nested templates
        return convertTemplateToString(value);
    }
    else if (Array.isArray(value)) {
        // array of strings or templates.
        const values = value.map((innerValue) => convertTemplateToString(innerValue));
        return values.join('');
    }
    else if (previousString.endsWith('=')) {
        return `"${value}"`;
    }
    else {
        return value;
    }
}