2017-09-30 23:01:30 +00:00
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import 'dart:convert';
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import 'package:angel_framework/angel_framework.dart';
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import 'package:code_buffer/code_buffer.dart';
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import 'package:file/file.dart';
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import 'package:jael/jael.dart';
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import 'package:jael_preprocessor/jael_preprocessor.dart';
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import 'package:symbol_table/symbol_table.dart';
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2017-10-01 03:14:44 +00:00
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/// Configures an Angel server to use Jael to render templates.
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///
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/// To enable "minified" output, you need to override the [createBuffer] function,
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/// to instantiate a [CodeBuffer] that emits no spaces or line breaks.
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2017-10-02 16:12:51 +00:00
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///
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/// To apply additional transforms to parsed documents, provide a set of [patch] functions.
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2017-09-30 23:01:30 +00:00
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AngelConfigurer jael(Directory viewsDirectory,
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2017-10-02 16:12:51 +00:00
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{String fileExtension, bool cacheViews: false, Iterable<Patcher> patch, CodeBuffer createBuffer()}) {
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2017-10-01 03:14:44 +00:00
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var cache = <String, Document>{};
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2017-09-30 23:01:30 +00:00
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fileExtension ??= '.jl';
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createBuffer ??= () => new CodeBuffer();
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return (Angel app) async {
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app.viewGenerator = (String name, [Map locals]) async {
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var errors = <JaelError>[];
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2017-10-01 03:14:44 +00:00
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Document processed;
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if (cacheViews == true && cache.containsKey(name)) {
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processed = cache[name];
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} else {
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var file = viewsDirectory.childFile(name + fileExtension);
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var contents = await file.readAsString();
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var doc =
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parseDocument(contents, sourceUrl: file.uri, onError: errors.add);
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processed = doc;
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try {
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2017-10-02 16:12:51 +00:00
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processed = await resolve(doc, viewsDirectory, patch: patch, onError: errors.add);
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2017-10-01 03:14:44 +00:00
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} catch (_) {
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// Ignore these errors, so that we can show syntax errors.
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}
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if (cacheViews == true) {
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cache[name] = processed;
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}
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2017-09-30 23:01:30 +00:00
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}
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var buf = createBuffer();
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var scope = new SymbolTable(values: locals ?? {});
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if (errors.isEmpty) {
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try {
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const Renderer().render(processed, buf, scope);
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return buf.toString();
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} on JaelError catch (e) {
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errors.add(e);
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}
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}
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buf
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..writeln('<!DOCTYPE html>')
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..writeln('<html lang="en">')
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..indent()
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..writeln('<head>')
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..indent()
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..writeln(
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'<meta name="viewport" content="width=device-width, initial-scale=1">',
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)
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..writeln('<title>${errors.length} Error(s)</title>')
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..outdent()
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..writeln('</head>')
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..writeln('<body>')
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..writeln('<h1>${errors.length} Error(s)</h1>')
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..writeln('<ul>')
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..indent();
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for (var error in errors) {
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var type =
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error.severity == JaelErrorSeverity.warning ? 'warning' : 'error';
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buf
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..writeln('<li>')
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..indent()
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..writeln(
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'<b>$type:</b> ${error.span.start.toolString}: ${error.message}')
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..writeln('<br>')
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..writeln(
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'<span style="color: red;">' +
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HTML_ESCAPE
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.convert(error.span.highlight(color: false))
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.replaceAll('\n', '<br>') +
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'</span>',
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)
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..outdent()
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..writeln('</li>');
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}
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buf
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..outdent()
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..writeln('</ul>')
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..writeln('</body>')
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..writeln('</html>');
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return buf.toString();
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};
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};
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}
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