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'use strict';
var Mixin = require('../../utils/mixin'),
inherits = require('util').inherits,
UNICODE = require('../../common/unicode');
//Aliases
var $ = UNICODE.CODE_POINTS;
var PositionTrackingPreprocessorMixin = module.exports = function (preprocessor) {
// NOTE: avoid installing tracker twice
if (!preprocessor.__locTracker) {
preprocessor.__locTracker = this;
Mixin.call(this, preprocessor);
this.preprocessor = preprocessor;
this.isEol = false;
this.lineStartPos = 0;
this.droppedBufferSize = 0;
this.col = -1;
this.line = 1;
}
return preprocessor.__locTracker;
};
inherits(PositionTrackingPreprocessorMixin, Mixin);
Object.defineProperty(PositionTrackingPreprocessorMixin.prototype, 'offset', {
get: function () {
return this.droppedBufferSize + this.preprocessor.pos;
}
});
PositionTrackingPreprocessorMixin.prototype._getOverriddenMethods = function (mxn, orig) {
return {
advance: function () {
var cp = orig.advance.call(this);
//NOTE: LF should be in the last column of the line
if (mxn.isEol) {
mxn.isEol = false;
mxn.line++;
mxn.lineStartPos = mxn.offset;
}
if (cp === $.LINE_FEED)
mxn.isEol = true;
mxn.col = mxn.offset - mxn.lineStartPos + 1;
return cp;
},
retreat: function () {
orig.retreat.call(this);
mxn.isEol = false;
mxn.col = mxn.offset - mxn.lineStartPos + 1;
},
dropParsedChunk: function () {
var prevPos = this.pos;
orig.dropParsedChunk.call(this);
mxn.droppedBufferSize += prevPos - this.pos;
}
};
};
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