'use strict';
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var Mixin = require('../../utils/mixin'),
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inherits = require('util').inherits,
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UNICODE = require('../../common/unicode');
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//Aliases
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var $ = UNICODE.CODE_POINTS;
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var PositionTrackingPreprocessorMixin = module.exports = function (preprocessor) {
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// NOTE: avoid installing tracker twice
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if (!preprocessor.__locTracker) {
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preprocessor.__locTracker = this;
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Mixin.call(this, 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.col = -1;
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this.line = 1;
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}
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return preprocessor.__locTracker;
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};
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inherits(PositionTrackingPreprocessorMixin, Mixin);
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Object.defineProperty(PositionTrackingPreprocessorMixin.prototype, 'offset', {
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get: function () {
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return this.droppedBufferSize + this.preprocessor.pos;
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}
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});
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PositionTrackingPreprocessorMixin.prototype._getOverriddenMethods = function (mxn, orig) {
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return {
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advance: function () {
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var cp = orig.advance.call(this);
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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 = mxn.offset;
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}
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if (cp === $.LINE_FEED)
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mxn.isEol = true;
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mxn.col = mxn.offset - mxn.lineStartPos + 1;
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return cp;
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},
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retreat: function () {
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orig.retreat.call(this);
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mxn.isEol = false;
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mxn.col = mxn.offset - mxn.lineStartPos + 1;
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},
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dropParsedChunk: function () {
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var prevPos = this.pos;
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orig.dropParsedChunk.call(this);
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mxn.droppedBufferSize += prevPos - this.pos;
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}
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};
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};
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