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-rw-r--r--ext/js/data/sandbox/string-util.js69
-rw-r--r--ext/js/dom/dom-text-scanner.js46
2 files changed, 75 insertions, 40 deletions
diff --git a/ext/js/data/sandbox/string-util.js b/ext/js/data/sandbox/string-util.js
new file mode 100644
index 00000000..65d73eef
--- /dev/null
+++ b/ext/js/data/sandbox/string-util.js
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2022 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 containing generic string utility functions.
+ */
+class StringUtil {
+ /**
+ * Reads code points from a string in the forward direction.
+ * @param {string} text The text to read the code points from.
+ * @param {number} position The index of the first character to read.
+ * @param {number} count The number of code points to read.
+ * @returns {string} The code points from the string.
+ */
+ static readCodePointsForward(text, position, count) {
+ let result = '';
+ for (; count > 0; --count) {
+ const char = text[position];
+ const charCode = char.charCodeAt(0);
+ result += char;
+ if (charCode >= 0xd800 && charCode < 0xdc00 && ++position < text.length) {
+ const char2 = text[position];
+ const charCode2 = char2.charCodeAt(0);
+ if (charCode2 >= 0xdc00 && charCode2 < 0xe000) {
+ result += char2;
+ }
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Reads code points from a string in the backward direction.
+ * @param {string} text The text to read the code points from.
+ * @param {number} position The index of the first character to read.
+ * @param {number} count The number of code points to read.
+ * @returns {string} The code points from the string.
+ */
+ static readCodePointsBackward(text, position, count) {
+ let result = '';
+ for (; count > 0; --count) {
+ const char = text[position];
+ const charCode = char.charCodeAt(0);
+ result = char + result;
+ if (charCode >= 0xdc00 && charCode < 0xe000 && position > 0) {
+ const char2 = text[position - 1];
+ const charCode2 = char2.charCodeAt(0);
+ if (charCode2 >= 0xd800 && charCode2 < 0xdc00) {
+ result = char2 + result;
+ }
+ }
+ }
+ return result;
+ }
+}
diff --git a/ext/js/dom/dom-text-scanner.js b/ext/js/dom/dom-text-scanner.js
index 7bed94a9..20aec9af 100644
--- a/ext/js/dom/dom-text-scanner.js
+++ b/ext/js/dom/dom-text-scanner.js
@@ -15,6 +15,10 @@
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
+/* global
+ * StringUtil
+ */
+
/**
* A class used to scan text in a document.
*/
@@ -146,44 +150,6 @@ class DOMTextScanner {
// Private
/**
- * Reads a code point in a string in the forward direction.
- * @param {string} text The text to read the code point from.
- * @param {number} position The index of the first character to read.
- * @returns {string} The code point from the string.
- */
- _readCodePointForward(text, position) {
- let char = text[position];
- const charCode = char.charCodeAt(0);
- if (charCode >= 0xd800 && charCode < 0xdc00 && ++position < text.length) {
- const char2 = text[position];
- const charCode2 = char2.charCodeAt(0);
- if (charCode2 >= 0xdc00 && charCode2 < 0xe000) {
- char += char2;
- }
- }
- return char;
- }
-
- /**
- * Reads a code point in a string in the backward direction.
- * @param {string} text The text to read the code point from.
- * @param {number} position The index of the first character to read.
- * @returns {string} The code point from the string.
- */
- _readCodePointBackward(text, position) {
- let char = text[position];
- const charCode = char.charCodeAt(0);
- if (charCode >= 0xdc00 && charCode < 0xe000 && position > 0) {
- const char2 = text[position - 1];
- const charCode2 = char2.charCodeAt(0);
- if (charCode2 >= 0xd800 && charCode2 < 0xdc00) {
- char = char2 + char;
- }
- }
- return char;
- }
-
- /**
* Seeks forward in a text node.
* @param {Text} textNode The text node to use.
* @param {boolean} resetOffset Whether or not the text offset should be reset.
@@ -202,7 +168,7 @@ class DOMTextScanner {
let newlines = this._newlines;
while (offset < nodeValueLength) {
- const char = this._readCodePointForward(nodeValue, offset);
+ const char = StringUtil.readCodePointsForward(nodeValue, offset, 1);
offset += char.length;
const charAttributes = DOMTextScanner.getCharacterAttributes(char, preserveNewlines, preserveWhitespace);
@@ -288,7 +254,7 @@ class DOMTextScanner {
let newlines = this._newlines;
while (offset > 0) {
- const char = this._readCodePointBackward(nodeValue, offset - 1);
+ const char = StringUtil.readCodePointsBackward(nodeValue, offset - 1, 1);
offset -= char.length;
const charAttributes = DOMTextScanner.getCharacterAttributes(char, preserveNewlines, preserveWhitespace);