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Merge pull request #181 from siikamiika/fix-zwnj

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ignore zero-width non-joiner
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Alex Yatskov 2019-08-17 09:03:26 -07:00 committed by GitHub
commit 6a96555d4c
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1 changed files with 47 additions and 10 deletions
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57
ext/fg/js/source.js
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@ -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;
}