1 files changed, 114 insertions, 0 deletions
diff --git a/ext/fg/js/util.js b/ext/fg/js/util.js
new file mode 100644
index 00000000..176765fc
--- /dev/null
+++ b/ext/fg/js/util.js
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2016  Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+
+function sendMessage(action, params) {
+    return new Promise((resolve, reject) => chrome.runtime.sendMessage({action, params}, resolve));
+}
+
+function findTerm(text) {
+    return sendMessage('findTerm', {text});
+}
+
+function findKanji(text) {
+    return sendMessage('findKanji', {text});
+}
+
+function renderText(data, template) {
+    return sendMessage('renderText', {data, template});
+}
+
+function canAddDefinitions(definitions, modes) {
+    return sendMessage('canAddDefinitions', {definitions, modes});
+}
+
+function addDefinition(definition, mode) {
+    return sendMessage('addDefinition', {definition, mode});
+}
+
+function textSourceFromPoint(point) {
+    const element = document.elementFromPoint(point.x, point.y);
+    if (element !== null) {
+        const names = ['IMG', 'INPUT', 'BUTTON', 'TEXTAREA'];
+        if (names.includes(element.nodeName)) {
+            return new TextSourceElement(element);
+        }
+    }
+
+    const range = document.caretRangeFromPoint(point.x, point.y);
+    if (range !== null) {
+        return new TextSourceRange(range);
+    }
+
+    return null;
+}
+
+function extractSentence(source, extent) {
+    const quotesFwd = {'「': '」', '『': '』', "'": "'", '"': '"'};
+    const quotesBwd = {'」': '「', '』': '『', "'": "'", '"': '"'};
+    const terminators = '…。．.？?！!';
+
+    const sourceLocal = source.clone();
+    const position = sourceLocal.setStartOffset(extent);
+    sourceLocal.setEndOffset(position + extent);
+    const content = sourceLocal.text();
+
+    let quoteStack = [];
+
+    let startPos = 0;
+    for (let i = position; i >= startPos; --i) {
+        const c = content[i];
+
+        if (quoteStack.length === 0 && (terminators.includes(c) || c in quotesFwd)) {
+            startPos = i + 1;
+            break;
+        }
+
+        if (quoteStack.length > 0 && c === quoteStack[0]) {
+            quoteStack.pop();
+        } else if (c in quotesBwd) {
+            quoteStack = [quotesBwd[c]].concat(quoteStack);
+        }
+    }
+
+    quoteStack = [];
+
+    let endPos = content.length;
+    for (let i = position; i < endPos; ++i) {
+        const c = content[i];
+
+        if (quoteStack.length === 0) {
+            if (terminators.includes(c)) {
+                endPos = i + 1;
+                break;
+            }
+            else if (c in quotesBwd) {
+                endPos = i;
+                break;
+            }
+        }
+
+        if (quoteStack.length > 0 && c === quoteStack[0]) {
+            quoteStack.pop();
+        } else if (c in quotesFwd) {
+            quoteStack = [quotesFwd[c]].concat(quoteStack);
+        }
+    }
+
+    return content.substring(startPos, endPos).trim();
+}