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-rw-r--r--ext/fg/js/source-input.js8
1 files changed, 6 insertions, 2 deletions
diff --git a/ext/fg/js/source-input.js b/ext/fg/js/source-input.js
index 9f5a76a0..d3c92793 100644
--- a/ext/fg/js/source-input.js
+++ b/ext/fg/js/source-input.js
@@ -18,9 +18,13 @@
class TextSourceInput {
- constructor(input) {
+ constructor(input, length=-1) {
this.input = input;
- this.length = -1;
+ this.length = length;
+ }
+
+ clone() {
+ return new TextSourceInput(this.input, this.length);
}
text() {