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-rw-r--r--ext/fg/js/source.js57
1 files changed, 47 insertions, 10 deletions
diff --git a/ext/fg/js/source.js b/ext/fg/js/source.js
index 664dbec7..bbf00e30 100644
--- a/ext/fg/js/source.js
+++ b/ext/fg/js/source.js
@@ -16,6 +16,9 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+// \u200c (Zero-width non-joiner) appears on Google Docs from Chrome 76 onwards
+const IGNORE_TEXT_PATTERN = /\u200c/;
+
/*
* TextSourceRange
@@ -124,11 +127,23 @@ class TextSourceRange {
static seekForwardHelper(node, state) {
if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
const offset = state.node === node ? state.offset : 0;
- const remaining = node.length - offset;
- const consumed = Math.min(remaining, state.remainder);
- state.content = state.content + node.nodeValue.substring(offset, offset + consumed);
+
+ let consumed = 0;
+ let stripped = 0;
+ while (state.remainder - consumed > 0) {
+ const currentChar = node.nodeValue[offset + consumed + stripped];
+ if (!currentChar) {
+ break;
+ } else if (currentChar.match(IGNORE_TEXT_PATTERN)) {
+ stripped++;
+ } else {
+ consumed++;
+ state.content += currentChar;
+ }
+ }
+
state.node = node;
- state.offset = offset + consumed;
+ state.offset = offset + consumed + stripped;
state.remainder -= consumed;
} else if (TextSourceRange.shouldEnter(node)) {
for (let i = 0; i < node.childNodes.length; ++i) {
@@ -161,11 +176,23 @@ class TextSourceRange {
static seekBackwardHelper(node, state) {
if (node.nodeType === 3 && node.parentElement && TextSourceRange.shouldEnter(node.parentElement)) {
const offset = state.node === node ? state.offset : node.length;
- const remaining = offset;
- const consumed = Math.min(remaining, state.remainder);
- state.content = node.nodeValue.substring(offset - consumed, offset) + state.content;
+
+ let consumed = 0;
+ let stripped = 0;
+ while (state.remainder - consumed > 0) {
+ const currentChar = node.nodeValue[offset - consumed - stripped]; // negative indices are undefined in JS
+ if (!currentChar) {
+ break;
+ } else if (currentChar.match(IGNORE_TEXT_PATTERN)) {
+ stripped++;
+ } else {
+ consumed++;
+ state.content = currentChar + state.content;
+ }
+ }
+
state.node = node;
- state.offset = offset - consumed;
+ state.offset = offset - consumed - stripped;
state.remainder -= consumed;
} else if (TextSourceRange.shouldEnter(node)) {
for (let i = node.childNodes.length - 1; i >= 0; --i) {
@@ -211,8 +238,18 @@ class TextSourceElement {
break;
}
- this.content = this.content || '';
- this.content = this.content.substring(0, length);
+ let consumed = 0;
+ let content = '';
+ for (let currentChar of this.content || '') {
+ if (consumed >= length) {
+ break;
+ } else if (!currentChar.match(IGNORE_TEXT_PATTERN)) {
+ consumed++;
+ content += currentChar;
+ }
+ }
+
+ this.content = content;
return this.content.length;
}