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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;
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