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var StringSource = module.exports = function(string, description) {
    var self = {
        asString: function() {
            return string;
        },
        range: function(startIndex, endIndex) {
            return new StringSourceRange(string, description, startIndex, endIndex);
        }
    };
    return self;
};

var StringSourceRange = function(string, description, startIndex, endIndex) {
    this._string = string;
    this._description = description;
    this._startIndex = startIndex;
    this._endIndex = endIndex;
};

StringSourceRange.prototype.to = function(otherRange) {
    // TODO: Assert that tokens are the same across both iterators
    return new StringSourceRange(this._string, this._description, this._startIndex, otherRange._endIndex);
};

StringSourceRange.prototype.describe = function() {
    var position = this._position();
    var description = this._description ? this._description + "\n" : "";
    return description + "Line number: " + position.lineNumber + "\nCharacter number: " + position.characterNumber;
};

StringSourceRange.prototype.lineNumber = function() {
    return this._position().lineNumber;
};

StringSourceRange.prototype.characterNumber = function() {
    return this._position().characterNumber;
};

StringSourceRange.prototype._position = function() {
    var self = this;
    var index = 0;
    var nextNewLine = function() {
        return self._string.indexOf("\n", index);
    };

    var lineNumber = 1;
    while (nextNewLine() !== -1 && nextNewLine() < this._startIndex) {
        index = nextNewLine() + 1;
        lineNumber += 1;
    }
    var characterNumber = this._startIndex - index + 1;
    return {lineNumber: lineNumber, characterNumber: characterNumber};
};