feat(parser/keyword): show occurrences summary

internal/parser/keyword/parser.go

@@ -2,6 +2,7 @@ package keyword
 
 import (
 	"fmt"
+	"sort"
 	"strings"
 
 	"github.com/joint-online-judge/JOJ3/internal/stage"
@@ -27,24 +28,48 @@ type Keyword struct{}
 func Parse(executorResult stage.ExecutorResult, conf Conf) stage.ParserResult {
 	score := conf.Score
 	comment := ""
+	matchCount := make(map[string]int)
+	scoreChange := make(map[string]int)
 	for _, match := range conf.Matches {
 		for _, keyword := range match.Keywords {
-			keywordMatchCount := 0
 			for _, file := range conf.Files {
 				content := executorResult.Files[file]
-				keywordMatchCount += strings.Count(content, keyword)
+				matchCount[keyword] += strings.Count(content, keyword)
 			}
 			if match.MaxMatchCount > 0 {
-				keywordMatchCount = min(keywordMatchCount, match.MaxMatchCount)
-			}
-			if keywordMatchCount > 0 {
-				score -= keywordMatchCount * match.Score
-				comment += fmt.Sprintf(
-					"Matched keyword %d time(s): %s\n",
-					keywordMatchCount, keyword)
+				matchCount[keyword] = min(
+					matchCount[keyword], match.MaxMatchCount)
 			}
+			score += -match.Score * matchCount[keyword]
+			scoreChange[keyword] = -match.Score * matchCount[keyword]
 		}
 	}
+	type Result struct {
+		Keyword     string
+		Count       int
+		ScoreChange int
+	}
+	var results []Result
+	for keyword, count := range matchCount {
+		results = append(results, Result{
+			Keyword:     keyword,
+			Count:       count,
+			ScoreChange: scoreChange[keyword],
+		})
+	}
+	sort.Slice(results, func(i, j int) bool {
+		if results[i].ScoreChange != results[j].ScoreChange {
+			return results[i].ScoreChange < results[j].ScoreChange
+		}
+		if results[i].Count != results[j].Count {
+			return results[i].Count > results[j].Count
+		}
+		return results[i].Keyword < results[j].Keyword
+	})
+	for i, result := range results {
+		comment += fmt.Sprintf("%d. `%s`: %d occurrence(s), %d point(s)\n",
+			i+1, result.Keyword, result.Count, result.ScoreChange)
+	}
 	return stage.ParserResult{
 		Score:   score,
 		Comment: comment,