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// Package vocab reads language-agnostic vocabulary files.
package vocab
import (
"fmt"
"os"
"strings"
)
// CardType identifies the semantic shape of a vocabulary entry.
type CardType string
const (
// CardTypeTranslation marks a standard word-to-translation entry.
CardTypeTranslation CardType = "translation"
// CardTypeDefinition marks a same-language word-to-definition entry.
CardTypeDefinition CardType = "definition"
)
// WordEntry represents a vocabulary entry with an optional translation.
type WordEntry struct {
Word string
Translation string
NeedsTranslation bool
CardType CardType
}
// ReadVocabularyFile reads vocabulary entries from a file and returns the parsed slice.
func ReadVocabularyFile(filename string) ([]WordEntry, error) {
content, err := os.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("read vocabulary file: %w", err)
}
normalized := strings.ReplaceAll(string(content), "\r\n", "\n")
lines := strings.Split(normalized, "\n")
entries := make([]WordEntry, 0, len(lines))
for _, line := range lines {
if entry := parseLine(line); entry != nil {
entries = append(entries, *entry)
}
}
if len(entries) == 0 {
return nil, nil
}
return entries, nil
}
func parseLine(line string) *WordEntry {
trimmed := strings.TrimSpace(line)
if trimmed == "" {
return nil
}
if strings.Contains(trimmed, "==") {
parts := strings.SplitN(trimmed, "==", 2)
if len(parts) != 2 {
return nil
}
word := strings.TrimSpace(parts[0])
translation := strings.TrimSpace(parts[1])
if word == "" || translation == "" {
return nil
}
return &WordEntry{
Word: word,
Translation: translation,
NeedsTranslation: false,
CardType: CardTypeDefinition,
}
}
if strings.Contains(trimmed, "=") {
parts := strings.SplitN(trimmed, "=", 2)
if len(parts) != 2 {
return nil
}
word := strings.TrimSpace(parts[0])
translation := strings.TrimSpace(parts[1])
if word == "" && translation != "" {
return &WordEntry{
Word: "",
Translation: translation,
NeedsTranslation: true,
CardType: CardTypeTranslation,
}
}
if word != "" && translation != "" {
return &WordEntry{
Word: word,
Translation: translation,
NeedsTranslation: false,
CardType: CardTypeTranslation,
}
}
return nil
}
return &WordEntry{
Word: trimmed,
Translation: "",
NeedsTranslation: false,
CardType: CardTypeTranslation,
}
}
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