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Fix issue where original ATN would be damaged by IntervalSet operations. Foxes #3216

This commit is contained in:
Eric Vergnaud 2021-03-19 00:11:03 +08:00
parent 20a4d9d138
commit d82e8921a6
1 changed files with 7 additions and 2 deletions
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9
runtime/JavaScript/src/antlr4/IntervalSet.js
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@ -7,11 +7,16 @@ const {Token} = require('./Token');
/* stop is not included! */ /* stop is not included! */
class Interval { class Interval {
constructor(start, stop) { constructor(start, stop) {
this.start = start; this.start = start;
this.stop = stop; this.stop = stop;
} }
clone() {
return new Interval(this.start, this.stop);
}
contains(item) { contains(item) {
return item >= this.start && item < this.stop; return item >= this.start && item < this.stop;
} }
@ -55,7 +60,7 @@ class IntervalSet {
addInterval(toAdd) { addInterval(toAdd) {
if (this.intervals === null) { if (this.intervals === null) {
this.intervals = []; this.intervals = [];
this.intervals.push(toAdd); this.intervals.push(toAdd.clone());
} else { } else {
// find insert pos // find insert pos
for (let pos = 0; pos < this.intervals.length; pos++) { for (let pos = 0; pos < this.intervals.length; pos++) {
@ -78,7 +83,7 @@ class IntervalSet {
} }
} }
// greater than any existing // greater than any existing
this.intervals.push(toAdd); this.intervals.push(toAdd.clone());
} }
} }