1 files changed, 106 insertions, 0 deletions
diff --git a/ext/js/language/de/german-transforms.js b/ext/js/language/de/german-transforms.js
new file mode 100644
index 00000000..d05ca874
--- /dev/null
+++ b/ext/js/language/de/german-transforms.js
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2024  Yomitan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {prefixInflection, suffixInflection} from '../language-transforms.js';
+
+// https://www.dartmouth.edu/~deutsch/Grammatik/Wortbildung/Separables.html
+const separablePrefixes = ['ab', 'an', 'auf', 'aus', 'auseinander', 'bei', 'da', 'dabei', 'dar', 'daran', 'dazwischen', 'durch', 'ein', 'empor', 'entgegen', 'entlang', 'entzwei', 'fehl', 'fern', 'fest', 'fort', 'frei', 'gegenüber', 'gleich', 'heim', 'her', 'herab', 'heran', 'herauf', 'heraus', 'herbei', 'herein', 'herüber', 'herum', 'herunter', 'hervor', 'hin', 'hinab', 'hinauf', 'hinaus', 'hinein', 'hinterher', 'hinunter', 'hinweg', 'hinzu', 'hoch', 'los', 'mit', 'nach', 'nebenher', 'nieder', 'statt', 'um', 'vor', 'voran', 'voraus', 'vorbei', 'vorüber', 'vorweg', 'weg', 'weiter', 'wieder', 'zu', 'zurecht', 'zurück', 'zusammen'];
+
+/**
+ * @param {string} prefix
+ * @param {string[]} conditionsIn
+ * @param {string[]} conditionsOut
+ * @returns {import('language-transformer').Rule}
+ */
+function separatedPrefix(prefix, conditionsIn, conditionsOut) {
+    const germanLetters = 'a-zA-ZäöüßÄÖÜẞ';
+    const regex = new RegExp(`^([${germanLetters}]+) .+ ${prefix}$`);
+    return {
+        type: 'other',
+        isInflected: regex,
+        deinflect: (term) => {
+            return term.replace(regex, '$1 ' + prefix);
+        },
+        conditionsIn,
+        conditionsOut
+    };
+}
+
+const separatedPrefixInflections = separablePrefixes.map((prefix) => {
+    return separatedPrefix(prefix, [], []);
+});
+
+const zuInfinitiveInflections = separablePrefixes.map((prefix) => {
+    return prefixInflection(prefix + 'zu', prefix, [], ['v']);
+});
+
+export const germanTransforms = {
+    language: 'de',
+    conditions: {
+        v: {
+            name: 'Verb',
+            isDictionaryForm: true
+        },
+        n: {
+            name: 'Noun',
+            isDictionaryForm: true
+        },
+        adj: {
+            name: 'Adjective',
+            isDictionaryForm: true
+        }
+    },
+    transforms: [
+        {
+            name: 'nominalization',
+            description: 'Noun formed from a verb',
+            rules: [
+                suffixInflection('ung', 'en', [], []),
+                suffixInflection('lung', 'eln', [], [])
+            ]
+        },
+        {
+            name: '-bar',
+            description: '-able adjective from a verb',
+            rules: [
+                suffixInflection('bar', 'en', [], ['v']),
+                suffixInflection('bar', 'n', [], ['v']) // Lieferbar
+            ]
+        },
+        {
+            name: 'negative',
+            description: 'Negation',
+            rules: [
+                prefixInflection('un', '', [], ['adj'])
+            ]
+        },
+        {
+            name: 'separated prefix',
+            description: 'Separable prefix',
+            rules: [
+                ...separatedPrefixInflections
+            ]
+        },
+        {
+            name: 'zu-infinitive',
+            description: 'zu-infinitive',
+            rules: [
+                ...zuInfinitiveInflections
+            ]
+        }
+    ]
+};