113 lines
4.5 KiB
Dart
113 lines
4.5 KiB
Dart
class WritingCheckResult {
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const WritingCheckResult({required this.complete, required this.message});
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final bool complete;
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final String message;
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}
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/// A deliberately small offline checker for teaching tasks. It checks only
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/// the essential A0 information, accepts variable names/places, and never
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/// claims to grade pronunciation or nuanced grammar.
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class WritingFeedback {
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const WritingFeedback._();
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static WritingCheckResult check(
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String lessonId,
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String input, {
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String? segmentId,
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}) {
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final text = input.toLowerCase().replaceAll('’', "'");
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final words = RegExp(
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r"[a-z]+(?:'[a-z]+)?",
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).allMatches(text).map((match) => match.group(0)!).toSet();
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bool has(String word) => words.contains(word);
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bool hasPhrase(String phrase) => text.contains(phrase);
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bool hasAny(Iterable<String> choices) => choices.any(has);
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final hasIntroduction =
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hasPhrase("i'm") || hasPhrase('i am') || hasPhrase('my name is');
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final hasItIs = hasPhrase("it's") || hasPhrase('it is');
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final complete = switch (segmentId) {
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'a0-04-a' => hasAll(words, ['zero', 'one', 'two', 'three']),
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'a0-04-b' => hasAll(words, ['six', 'seven', 'eight']),
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'a0-04-c' =>
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RegExp(
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r'\b(one|two|three|four|five|six|seven|eight|nine|zero)\b',
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).allMatches(text).length >=
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3,
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'a0-08-a' => hasItIs && hasAny(['monday', 'tuesday', 'wednesday']),
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'a0-08-b' =>
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hasItIs && hasAny(['thursday', 'friday', 'saturday', 'sunday']),
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'a0-08-c' => hasItIs && (has('oclock') || text.contains("o'clock")),
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_ => switch (lessonId) {
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'a0-01' => hasAny(['hello', 'hi']) && hasIntroduction,
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'a0-02' =>
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(hasPhrase('my name') || hasIntroduction) &&
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RegExp(r'[a-z](?:[ -]?[a-z]){2,}').hasMatch(text),
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'a0-03' => hasIntroduction && hasAny(['good', 'okay', 'tired']),
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'a0-04' =>
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RegExp(
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r'\b(zero|one|two|three|four|five|six|seven|eight|nine|ten)\b',
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).allMatches(text).length >=
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3,
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'a0-05' => hasItIs && hasAny(['book', 'pen', 'bag', 'key']),
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'a0-06' => hasIntroduction && has('from') && words.length >= 3,
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'a0-07' =>
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hasPhrase('this is my') &&
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hasAny(['mother', 'father', 'sister', 'brother', 'friend']),
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'a0-08' =>
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hasItIs &&
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(hasAny([
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'monday',
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'tuesday',
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'wednesday',
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'thursday',
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'friday',
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'saturday',
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'sunday',
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]) ||
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has('clock')),
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'a0-09' => hasIntroduction && has('like') && words.length >= 3,
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'a0-10' => hasIntroduction && has('from') && has('like'),
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_ => words.length >= 2,
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},
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};
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if (complete) {
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return const WritingCheckResult(
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complete: true,
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message: '这句已经表达完整。继续在对话里用一次吧。',
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);
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}
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return WritingCheckResult(
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complete: false,
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message: _hintFor(segmentId ?? lessonId),
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);
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}
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static bool hasAll(Set<String> words, Iterable<String> required) =>
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required.every(words.contains);
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static String _hintFor(String lessonId) => switch (lessonId) {
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'a0-04-a' => '请写出 zero、one、two、three 四个数字。',
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'a0-04-b' => '请写出 six、seven、eight 三个数字。',
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'a0-04-c' => '用英文一个一个写出三个数字，例如 one-three-nine。',
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'a0-08-a' => '用 It is / It’s 加 Monday、Tuesday 或 Wednesday。',
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'a0-08-b' => '用 It is / It’s 加 Thursday、Friday、Saturday 或 Sunday。',
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'a0-08-c' => '用 It is / It’s 加数字和 o’clock，例如 It’s three o’clock。',
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'a0-01' => '试着同时写一句问候和姓名，例如：Hello. I’m …',
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'a0-02' => '写出姓名，并把至少三个字母用空格或连字符拼出来。',
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'a0-03' => '用 I’m / I am 加上你的状态，例如 good 或 tired。',
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'a0-04' => '用英文写出三个数字，例如 one-three-nine。',
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'a0-05' => '用 It’s / It is 加一个物品，例如 a pen。',
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'a0-06' => '用 I’m from … 写成一个完整句子。',
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'a0-07' => '用 This is my … 介绍一位家人或朋友。',
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'a0-08' => '用 It’s … 写一个星期或整点时间。',
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'a0-09' => '用 I like … 写出一种喜好。',
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'a0-10' => '分别写姓名、来自哪里和一项喜好三部分。',
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_ => '再补充一个完整英文句子。',
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};
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}
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