/// <summary>
/// Initialize a new instance of HtmlKeywordsReplacer class.
/// </summary>
/// <param name="providers">Keywords providers.</param>
/// <exception cref="System.ArgumentException"><paramref name="providers"/> is null or empty.</exception>
public HtmlKeywordsReplacer(params IHtmlKeywordReplacementProvider[] providers)
{
if (providers == null || providers.Length == 0)
{
throw new ArgumentException("Keywords providers is null or empty.", "providers");
}
StringBuilder pattern = new StringBuilder();
foreach (IHtmlKeywordReplacementProvider provider in providers)
{
if (provider == null)
{
continue;
}
foreach (HtmlKeywordReplacementInfo info in provider.Keywords)
{
pattern.AppendFormat("|{0}", RegexUtility.Encode(info.Keyword));
this.m_keywords[info.Keyword.ToLower()] = info;
}
this.m_providers.Add(provider);
}
if (pattern.Length > 0)
{
this.m_regex = new Regex(pattern.Remove(0, 1).ToString(), RegexOptions.IgnoreCase | RegexOptions.Compiled);
}
}
public OperationExpressionCalculator(IEnumerable <IOperationRule> rules)
{
if (rules == null || !rules.Any())
{
throw new ArgumentException("rules is null ro empty", "rules");
}
StringBuilder pattern = new StringBuilder(string.Format("(?:{0}[^{0}]*{0})", STRING_DELIMITER));
foreach (string item in rules.Select((item) => item.OperandPattern).Where((item) => item != null).OrderByDescending((item) => item.Length).Distinct(StringComparer.OrdinalIgnoreCase))
{
pattern.AppendFormat("|(?:{0})", item);
}
foreach (string item in rules.Select((item) => item.OperatorSymbol).OrderByDescending((item) => item.Length).Distinct(StringComparer.OrdinalIgnoreCase))
{
pattern.AppendFormat("|(?:{0})", RegexUtility.Encode(item));
}
this.m_whitespaceRegex = new Regex("\\s+", RegexOptions.Compiled);
this.m_expressionRegex = new Regex(pattern.ToString(), RegexOptions.Compiled | RegexOptions.IgnoreCase);
this.m_wellFormedRegex = new Regex(pattern.AppendFormat("|\\{0}|\\{1}", LEFT_BRACKET, RIGHT_BRACKET).ToString(), RegexOptions.Compiled | RegexOptions.IgnoreCase);
this.m_bracketRegex = new Regex(string.Format(
"(?>" +
"^{2}*" +
"(?:" +
"(?:(?'left'{0}){2}+)+" +
"(?:(?'inner-left'{1}){2}*)+" +
")*" +
"(?(left)(?!))$" +
")",
"\\" + LEFT_BRACKET,
"\\" + RIGHT_BRACKET,
string.Format("[^\\{0}\\{1}]", LEFT_BRACKET, RIGHT_BRACKET)), RegexOptions.Compiled);
this.m_rules = rules.ToIDictionary((item) => item.OperatorSymbol);
}
/// <summary>
/// Returns a new string in which all occurrences of the specified strings in the current instance are replaced with another specified strings.
/// </summary>
/// <param name="text"></param>
/// <param name="oldValues"></param>
/// <param name="newValueSelector"></param>
/// <param name="ignoreCase"></param>
/// <returns></returns>
public static string Replace(this string text, IEnumerable <string> oldValues, Func <string, string> newValueSelector, bool ignoreCase)
{
if (string.IsNullOrWhiteSpace(text))
{
return(text);
}
oldValues = new List <string>(oldValues.Where((item) => !string.IsNullOrEmpty(item)));
if (oldValues.Count() == 0)
{
return(text);
}
if (oldValues.Count() == 1)
{
string oldValue = oldValues.First();
return(Regex.Replace(text, RegexUtility.Encode(oldValue), newValueSelector(oldValue), ignoreCase ? RegexOptions.IgnoreCase : RegexOptions.None));
}
//search all occurrences of each old value
int groupIndex = 0;
StringBuilder pattern = new StringBuilder();
IDictionary <Range, string> replacement = new Dictionary <Range, string>();
foreach (string item in oldValues)
{
pattern.AppendFormat("({0})|", RegexUtility.Encode(item));
}
foreach (Match match in Regex.Matches(text, pattern.Remove(pattern.Length - 1, 1).ToString(), ignoreCase ? RegexOptions.IgnoreCase : RegexOptions.None))
{
groupIndex = -1;
for (int i = 1; i < match.Groups.Count; i++)
{
if (match.Groups[i].Success)
{
groupIndex = i;
break;
}
}
replacement[new Range(match.Index, match.Length)] = newValueSelector(oldValues.ElementAt(groupIndex - 1));
}
//replace all old values
int offset = 0;
Range key = null;
string value = null;
int index = 0, length = 0;
StringBuilder result = new StringBuilder(text);
foreach (KeyValuePair <Range, string> item in replacement)
{
key = item.Key;
value = item.Value;
index = Convert.ToInt32(key.StartIndex) + offset;
length = Convert.ToInt32(key.Length);
result.Remove(index, length);
result.Insert(index, value);
offset += value.Length - length;
}
return(result.ToString());
}
