82 lines
2.9 KiB
TypeScript
82 lines
2.9 KiB
TypeScript
import {BadRequestError} from './errors.ts';
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import {dotNotation} from './objects.ts';
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import {matchAll} from './string.ts';
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import {formatDate} from './time.ts';
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export class TemplateError extends BadRequestError { }
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export async function renderTemplate(template: string, data: any, fetch?: (file: string) => Promise<string>) {
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let content = template, found: any;
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const now = new Date(), d = {
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date: {
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day: now.getDate(),
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month: now.toLocaleString('default', { month: 'long' }),
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year: now.getFullYear(),
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time: now.toLocaleTimeString(),
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format: formatDate
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},
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...(data || {}),
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};
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if(!fetch) fetch = (file) => {
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throw new TemplateError(`Unable to fetch template: ${file}`);
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}
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const evaluate = (code: string, data: object, fatal = true) => {
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try {
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return Function('data', `with(data) { return ${code}; }`)(data);
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} catch {
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if(fatal) throw new TemplateError(`Failed to evaluate: ${code}`);
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else return false;
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}
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}
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// If Statements - Optimize what we render: `{{ ? javascript }} TRUE CONTENT {{ !? }} FALSE CONTENT {{ /? }}`
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while(!!(found = /\{\{\s*?\?\s*?(.+?)\s*?}}([\s\S]*?)(?:\{\{\s*?!\?\s*?}}([\s\S]*?))?\{\{\s*?\/\?\s*?}}/g.exec(content))) {
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const nested = matchAll(found[0], /\{\{\s*?\?.+?}}/g).slice(-1)?.[0]?.index;
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if(nested != 0)
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found = /\{\{\s*?\?\s*?(.+?)\s*?}}([\s\S]*?)(?:\{\{\s*?!\?\s*?}}([\s\S]*?))?\{\{\s*?\/\?\s*?}}/g.exec(content.slice(found.index + nested))
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content = content.replace(found[0], (evaluate(found[1], d, false) ? found[2] : found[3]) || '');
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}
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// Imports - We render bottom up: `{{ < file.html }}`
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while(!!(found = /\{\{\s*?<\s*?(.+?)\s*?}}/g.exec(content))) {
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content = content.replace(found[0], await renderTemplate(await fetch(found[1].trim()), data, fetch));
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}
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// For Loops: `{{ * (row, index) in invoice }} CONTENT {{ /* }}`
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while(!!(found = /\{\{\s*?\*\s*?(.+?)\s+in\s+(.+?)\s*?}}([\s\S]*?)\{\{\s*?\/\*\s*?}}/g.exec(content))) {
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const split = found[1].replaceAll(/[()\s]/g, '').split(',');
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const element = split[0];
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const index = split[1] || 'index';
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const array: any[] = <any>dotNotation(data, found[2]);
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if(!array || typeof array != 'object')
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throw new TemplateError(`Cannot iterate: ${found[2]}`);
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let compiled = [];
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for(let i = 0; i < array.length; i++) {
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compiled.push(renderTemplate(found[3], {
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...d,
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[element]: array[i],
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[index]: i
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}, fetch))
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}
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content = content.replace(found[0], compiled.join('\n'));
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}
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// Evaluate whatever is left - Should come last: `{{ javascript }}`
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while(!!(found = /\{\{\s*([^<>\*\?!/}\s][^}]*?)\s*}}/g.exec(content))) {
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content = content.replace(found[0], evaluate(found[1].trim(), d) || '');
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}
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// Extends: `{{ > file.html:property }} CONTENT {{ /> }}`
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while(!!(found = /\{\{\s*?>\s*?(.+?):(.+?)\s*?}}([\s\S]*?)\{\{\s*?\/>\s*?}}/g.exec(content))) {
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content = content.replace(found[0], await renderTemplate(await fetch(found[1].trim()), {
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...data,
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[found[2].trim()]: found[3],
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}, fetch));
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}
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return content;
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}
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