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authortoasted-nutbread <toasted-nutbread@users.noreply.github.com>2021-01-28 21:17:10 -0500
committerGitHub <noreply@github.com>2021-01-28 21:17:10 -0500
commite610a62ceb07313c581a0bd2d5c8ebbc7c39ba4f (patch)
tree2c798350f52f47cc64353c12e54c43ebf2a535fc /ext/bg/js/template-patcher.js
parented0c0c20c095ac693dac3f1c4145e4c8dc83601a (diff)
Refactor anki field templates (#1323)
* Update glossary and glossary-single * Define patch * Create TemplatePatcher * Add test
Diffstat (limited to 'ext/bg/js/template-patcher.js')
-rw-r--r--ext/bg/js/template-patcher.js92
1 files changed, 92 insertions, 0 deletions
diff --git a/ext/bg/js/template-patcher.js b/ext/bg/js/template-patcher.js
new file mode 100644
index 00000000..57178957
--- /dev/null
+++ b/ext/bg/js/template-patcher.js
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2021 Yomichan 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/>.
+ */
+
+class TemplatePatcher {
+ constructor() {
+ this._diffPattern1 = /\n?\{\{<<<<<<<\}\}\n/g;
+ this._diffPattern2 = /\n\{\{=======\}\}\n/g;
+ this._diffPattern3 = /\n\{\{>>>>>>>\}\}\n*/g;
+ this._lookupMarkerPattern = /[ \t]*\{\{~?>\s*\(\s*lookup\s*\.\s*"marker"\s*\)\s*~?\}\}/g;
+ }
+
+ parsePatch(content) {
+ const diffPattern1 = this._diffPattern1;
+ const diffPattern2 = this._diffPattern2;
+ const diffPattern3 = this._diffPattern3;
+ const modifications = [];
+ let index = 0;
+
+ while (true) {
+ // Find modification boundaries
+ diffPattern1.lastIndex = index;
+ const m1 = diffPattern1.exec(content);
+ if (m1 === null) { break; }
+
+ diffPattern2.lastIndex = m1.index + m1[0].length;
+ const m2 = diffPattern2.exec(content);
+ if (m2 === null) { break; }
+
+ diffPattern3.lastIndex = m2.index + m2[0].length;
+ const m3 = diffPattern3.exec(content);
+ if (m3 === null) { break; }
+
+ // Construct
+ const current = content.substring(m1.index + m1[0].length, m2.index);
+ const replacement = content.substring(m2.index + m2[0].length, m3.index);
+
+ if (current.length > 0) {
+ modifications.push({current, replacement});
+ }
+
+ // Update
+ content = content.substring(0, m1.index) + content.substring(m3.index + m3[0].length);
+ index = m1.index;
+ }
+
+ return {addition: content, modifications};
+ }
+
+ applyPatch(template, patch) {
+ for (const {current, replacement} of patch.modifications) {
+ let fromIndex = 0;
+ while (true) {
+ const index = template.indexOf(current, fromIndex);
+ if (index < 0) { break; }
+ template = template.substring(0, index) + replacement + template.substring(index + current.length);
+ fromIndex = index + replacement.length;
+ }
+ }
+ template = this._addFieldTemplatesBeforeEnd(template, patch.addition);
+ return template;
+ }
+
+ // Private
+
+ _addFieldTemplatesBeforeEnd(template, addition) {
+ const newline = '\n';
+ let replaced = false;
+ template = template.replace(this._lookupMarkerPattern, (g0) => {
+ replaced = true;
+ return `${addition}${newline}${g0}`;
+ });
+ if (!replaced) {
+ template += newline;
+ template += addition;
+ }
+ return template;
+ }
+}