45 lines
1 KiB
Dart
45 lines
1 KiB
Dart
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// For some reason, this cannot be run in checked mode???
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import 'dart:io';
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import 'package:combinator/combinator.dart';
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import 'package:string_scanner/string_scanner.dart';
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final Parser<String> key =
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match<String>(RegExp(r'[^=&\n]+'), errorMessage: 'Missing k/v')
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.value((r) => r.span.text);
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final Parser value = key.map((r) => Uri.decodeQueryComponent(r.value));
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final Parser pair = chain([
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key,
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match('='),
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value,
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]).map((r) {
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return {
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r.value[0]: r.value[2],
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};
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});
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final Parser pairs = pair
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.separatedBy(match(r'&'))
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.map((r) => r.value.reduce((a, b) => a..addAll(b)));
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final Parser queryString = pairs.opt();
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main() {
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while (true) {
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stdout.write('Enter a query string: ');
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var line = stdin.readLineSync();
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var scanner = new SpanScanner(line, sourceUrl: 'stdin');
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var result = pairs.parse(scanner);
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if (!result.successful) {
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for (var error in result.errors) {
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print(error.toolString);
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print(error.span.highlight(color: true));
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}
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} else
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print(result.value);
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}
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}
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