1 files changed, 24 insertions, 0 deletions
diff --git a/node_modules/parse5/lib/extensions/error-reporting/preprocessor-mixin.js b/node_modules/parse5/lib/extensions/error-reporting/preprocessor-mixin.js
new file mode 100644
index 0000000..398c966
--- /dev/null
+++ b/node_modules/parse5/lib/extensions/error-reporting/preprocessor-mixin.js
@@ -0,0 +1,24 @@
+'use strict';
+
+const ErrorReportingMixinBase = require('./mixin-base');
+const PositionTrackingPreprocessorMixin = require('../position-tracking/preprocessor-mixin');
+const Mixin = require('../../utils/mixin');
+
+class ErrorReportingPreprocessorMixin extends ErrorReportingMixinBase {
+    constructor(preprocessor, opts) {
+        super(preprocessor, opts);
+
+        this.posTracker = Mixin.install(preprocessor, PositionTrackingPreprocessorMixin);
+        this.lastErrOffset = -1;
+    }
+
+    _reportError(code) {
+        //NOTE: avoid reporting error twice on advance/retreat
+        if (this.lastErrOffset !== this.posTracker.offset) {
+            this.lastErrOffset = this.posTracker.offset;
+            super._reportError(code);
+        }
+    }
+}
+
+module.exports = ErrorReportingPreprocessorMixin;