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