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//------------------------------------------------------------------------------
// <copyright file="JavaScriptString.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Script.Serialization {
using System;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Text;
internal class JavaScriptString {
private string _s;
private int _index;
internal JavaScriptString(string s) {
_s = s;
}
internal Nullable<char> GetNextNonEmptyChar() {
while (_s.Length > _index) {
char c = _s[_index++];
if (!Char.IsWhiteSpace(c)) {
return c;
}
}
return null;
}
internal Nullable<char> MoveNext() {
if (_s.Length > _index) {
return _s[_index++];
}
return null;
}
internal string MoveNext(int count) {
if (_s.Length >= _index + count) {
string result = _s.Substring(_index, count);
_index += count;
return result;
}
return null;
}
internal void MovePrev() {
if (_index > 0) {
_index--;
}
}
internal void MovePrev(int count) {
while (_index > 0 && count > 0) {
_index--;
count--;
}
}
public override string ToString() {
if (_s.Length > _index) {
return _s.Substring(_index);
}
return String.Empty;
}
internal string GetDebugString(string message) {
return message + " (" + _index + "): " + _s;
}
internal int IndexOf(string substr) {
if (_s.Length > _index) {
return _s.IndexOf(substr, _index, StringComparison.CurrentCulture) - _index;
}
return -1;
}
internal string Substring(int length) {
if (_s.Length > _index + length) {
return _s.Substring(_index, length);
}
return ToString();
}
}
}
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