first commit

app_vue/node_modules/parse5/lib/extensions/position-tracking/preprocessor-mixin.js

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+'use strict';
+
+const Mixin = require('../../utils/mixin');
+
+class PositionTrackingPreprocessorMixin extends Mixin {
+    constructor(preprocessor) {
+        super(preprocessor);
+
+        this.preprocessor = preprocessor;
+        this.isEol = false;
+        this.lineStartPos = 0;
+        this.droppedBufferSize = 0;
+
+        this.offset = 0;
+        this.col = 0;
+        this.line = 1;
+    }
+
+    _getOverriddenMethods(mxn, orig) {
+        return {
+            advance() {
+                const pos = this.pos + 1;
+                const ch = this.html[pos];
+
+                //NOTE: LF should be in the last column of the line
+                if (mxn.isEol) {
+                    mxn.isEol = false;
+                    mxn.line++;
+                    mxn.lineStartPos = pos;
+                }
+
+                if (ch === '\n' || (ch === '\r' && this.html[pos + 1] !== '\n')) {
+                    mxn.isEol = true;
+                }
+
+                mxn.col = pos - mxn.lineStartPos + 1;
+                mxn.offset = mxn.droppedBufferSize + pos;
+
+                return orig.advance.call(this);
+            },
+
+            retreat() {
+                orig.retreat.call(this);
+
+                mxn.isEol = false;
+                mxn.col = this.pos - mxn.lineStartPos + 1;
+            },
+
+            dropParsedChunk() {
+                const prevPos = this.pos;
+
+                orig.dropParsedChunk.call(this);
+
+                const reduction = prevPos - this.pos;
+
+                mxn.lineStartPos -= reduction;
+                mxn.droppedBufferSize += reduction;
+                mxn.offset = mxn.droppedBufferSize + this.pos;
+            }
+        };
+    }
+}
+
+module.exports = PositionTrackingPreprocessorMixin;