private static void GenerateFromPattern(StringBuilder sb, string pattern, NamedPatterns namedPatterns = null, GenerationConfig config = null, Random random = null)
{
if (pattern == null || string.IsNullOrEmpty(pattern))
{
throw new GenerationException("Argument 'pattern' cannot be null.");
}
if (namedPatterns == null)
{
namedPatterns = LoadDefaultNamedPatterns(config);
}
if (config != null && config.PatternFiles != null)
{
// Load all from the PatternFiles in config
AppendPatternsFromConfigToCollection(config, namedPatterns);
}
if (config == null)
{
config = new GenerationConfig();
}
if (random == null)
{
random = config.Random;
}
ProcessPattern(sb, pattern, namedPatterns, random);
}
public static string GenerateFromPattern(string pattern, NamedPatterns namedPatterns, GenerationConfig config)
{
var sb = new StringBuilder();
InternalGenerateFromPattern(sb, pattern, namedPatterns, config, null);
return(sb.ToString());
}
public static string GenerateFromPattern(string pattern, NamedPatterns namedPatterns = null, GenerationConfig config = null, Random random = null)
{
var sb = new StringBuilder();
GenerateFromPattern(sb, pattern, namedPatterns, config, random);
return(sb.ToString());
}
private static void ProcessPattern(StringBuilder sb, string exp, NamedPatterns namedPatterns, Random random)
{
bool isEscaped = false;
var curNdx = 0;
while (curNdx < exp.Length)
{
var chx = exp[curNdx];
if (chx == _Escape)
{
if (isEscaped)
{
// "\\" handling
isEscaped = false;
}
else
{
// "...\..." detected, entering escaped symbol handling on next pass.
isEscaped = true;
curNdx++;
continue;
}
}
if (!isEscaped && chx == _Section_Start)
{
AppendContentFromSectionExpression(sb, exp, ref curNdx, namedPatterns, random);
continue; // skip to next character - index has already been forwarded to new position
}
// check are we entering a set pattern that may include a quantifier
// Format = "[Vv]{4}" = generate 4 random ordered characters comprising of either V or v characters
if (!isEscaped && chx == _Set_Start)
{
AppendContentFromSetExpression(sb, exp, ref curNdx, random);
continue; // skip to next character - index has already been forwarded to new position
}
if (!isEscaped && chx == _NamedPattern_Start)
{
AppendContentFromNamedPattern(sb, exp, ref curNdx, namedPatterns, random);
continue;
}
// check are we entering a repeat symbol section
// Format = "L{4}" = repeat L symbol 4 times.
// Format = "\\{4}" = repeat \ symbol 4 times.
bool repeatSymbol = curNdx < exp.Length - 1 && exp[curNdx + 1] == _Quantifier_Start;
if (repeatSymbol)
{
AppendRepeatedSymbol(sb, exp, ref curNdx, isEscaped, random);
isEscaped = false;
continue; // skip to next character - index has already been forwarded to new position
}
AppendCharacterDerivedFromSymbol(sb, chx, isEscaped, random);
curNdx++; // increment to move to next character.
isEscaped = false;
}
}
private static void GenerateFromAlternatedPattern(StringBuilder sb, NamedPatterns namedPatterns, string exp, ContentOptions contentOptions, Random random)
{
var alternates = exp.Split(_Alternation);
for (int x = 0; x < contentOptions.Repeat; x++)
{
exp = alternates[random.Next(0, alternates.Length)];
GenerateFromPattern(sb, exp, namedPatterns, null, random);
}
}
public ValidityChain Match(NamedPatterns name)
{
Regex pattern = null;
switch (name)
{
case NamedPatterns.Date:
pattern = new Regex(@"^([01]?\d)\/([012]?\d|30|31)\/\d{1,4}$");
break;
case NamedPatterns.Email:
pattern = new Regex(@"^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$", RegexOptions.IgnoreCase);
break;
case NamedPatterns.Guid:
pattern = new Regex(@"^(\{?([0-9a-fA-F]){8}-(([0-9a-fA-F]){4}-){3}([0-9a-fA-F]){12}\}?)$");
break;
case NamedPatterns.Integer:
pattern = new Regex(@"^\d+$");
break;
case NamedPatterns.Number:
pattern = new Regex(@"^[+-]?(\d+(\.\d*)?|\.\d+)([Ee]\d+)?$");
break;
case NamedPatterns.Phone:
pattern = new Regex(@"^[2-9]\d{2}-\d{3}-\d{4}$");
break;
case NamedPatterns.Time12:
pattern = new Regex(@"^[01]?\d:[0-5]\d?\s?[aApP]\.?[mM]\.?$");
break;
case NamedPatterns.Time24:
pattern = new Regex(@"^(20|21|22|23|[01]\d|\d)(([:][0-5]\d){1,2})$");
break;
case NamedPatterns.URL:
pattern = new Regex(@"^(https?|ftp):\/\/(((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:)*@)?(((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?)(:\d*)?)(\/((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)?)?(\?((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|[\uE000-\uF8FF]|\/|\?)*)?(\#((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|\/|\?)*)?$", RegexOptions.IgnoreCase);
break;
case NamedPatterns.USD:
pattern = new Regex(@"^\$?(\d{1,3},?(\d{3},?)*\d{3}(\.\d{0,2})?|\d{1,3}(\.\d{0,2})?|\.\d{1,2}?)$");
break;
case NamedPatterns.Zip:
pattern = new Regex(@"^\d{5}(-\d{4})?$");
break;
}
return(Validate(s => pattern.IsMatch(s)));
}
private static NamedPatterns LoadDefaultNamedPatterns()
{
var patterns = new NamedPatterns();
var path = FileReader.GetPatternFilePath("default");
if (File.Exists(path))
{
patterns = FileReader.LoadNamedPatterns(path, false);
}
return(patterns);
}
/// <summary>
/// Takes in a string that contains 0 or more <<placeholder>> values and replaces the placeholder item with the expression it defines.
/// </summary>
/// <param name="template"></param>
/// <param name="namedPatterns"></param>
/// <returns></returns>
public static string GenerateFromTemplate(string template, NamedPatterns namedPatterns)
{
var sb = new StringBuilder();
int index = 0;
while (index < template.Length)
{
// Find our next placeholder
int start = FindPositionOfNext(template, index, _Placeholder_Start, _Placeholder_End);
if (start == -1)
{
sb.Append(template.Substring(index)); //add remaining string.
break; // all done!
}
bool isEscaped = start > 2 && template[start - 1].Equals(_Escape) && template[start - 2].Equals(_Escape);
if (isEscaped)
{
start = start - 2;
}
sb.Append(template.Substring(index, start - index)); // Append everything up to start as it is.
if (isEscaped)
{
start = start + 2;
}
start = start + 2; // move past '<<' to start of expression
int end = FindPositionOfNext(template, start, _Placeholder_End, _Placeholder_Start); // find end of placeholder
if (end == -1)
{
throw new GenerationException("Unable to find closing placeholder after " + start);
}
var pattern = template.Substring(start, end - start); // grab our expression
if (isEscaped)
{
sb.Append("<<" + pattern + ">>");
}
else
{
sb.Append(GenerateFromPattern(pattern, namedPatterns)); // generate value from expression
}
index = end + 2; // update our index.
}
return(sb.ToString());
}
private static NamedPatterns LoadDefaultNamedPatterns(GenerationConfig generationConfig)
{
var patterns = new NamedPatterns();
if (generationConfig == null || generationConfig.LoadDefaultPatternFile == false)
{
return(patterns); // Dont attempt to load default pattern files with every execution -- too slow.
}
var path = FileReader.GetPatternFilePath("default");
if (File.Exists(path))
{
patterns = FileReader.LoadNamedPatterns(path, false);
}
return(patterns);
}
public void Can_Generate_NamedPatterns_All_Defaults_Name()
{
var sw = new System.Diagnostics.Stopwatch();
sw.Start();
var namedPatterns = FileReader.LoadNamedPatterns(@"default.tdg-patterns");
var nps = new NamedPatterns();
nps.CollectionName = "Test";
foreach (var dic in namedPatterns.Patterns)
{
var text = AlphaNumericGenerator.GenerateFromPattern("@" + dic.Name + "@");
Console.WriteLine("'{0}' produced '{1}'", dic.Name, text);
Assert.IsTrue(text.Length > 0);
}
sw.Stop();
Console.WriteLine("All {0} default patterns generated in {1} milliseconds.\n"
, namedPatterns.Patterns.Count
, sw.ElapsedMilliseconds);
}
private static void AppendContentFromNamedPattern(StringBuilder sb, string characters, ref int index, NamedPatterns namedPatterns, Random random)
{
var ndx = index;
var tuple = GetContentOptions(characters, ref index, _NamedPattern_Start.ToString(CultureInfo.InvariantCulture), _NamedPattern_End.ToString(CultureInfo.InvariantCulture), random);
if (namedPatterns.HasPattern(tuple.Content)) // $namedPattern;
{
GenerateFromPattern(sb, namedPatterns.GetPattern(tuple.Content).Pattern, namedPatterns, null, random);
}
else
{
var msg = BuildErrorSnippet(characters, ndx);
msg = "Found named pattern placeholder '" + tuple.Content + "' but was not provided with a corresponding pattern Check Named Patterns file." + Environment.NewLine + msg;
throw new GenerationException(msg);
}
}
/// <summary>
///
/// </summary>
/// <param name="pattern">
/// The format of the text produced. 15 random characters is the default.
/// . - An uppercase or lowercase letter or number.
/// w - Any Letter.
/// L - An uppercase Letter.
/// l - A lowercase letter.
/// V - An uppercase Vowel.
/// v - A lowercase vowel.
/// C - An uppercase Consonant.
/// c - A lowercase consonant.
/// n - Any number, 1-9.
/// d - Any number, 0-9.
/// -------
/// Patterns can be produced:
/// "\.{10}" will produce a random string 10 characters long.
/// </param>
/// <param name="namedPatterns"></param>
/// <returns></returns>
public static string GenerateFromPattern(string pattern, NamedPatterns namedPatterns)
{
if(pattern == null)
throw new GenerationException("Argument 'pattern' cannot be null.");
var sb = new StringBuilder();
bool isEscaped = false;
int index = 0;
while(index < pattern.Length)
{
char ch = pattern[index];
// check for escape chars for next part
if (ch == _Escape)
{
if (isEscaped)
{
sb.Append(@"\");
isEscaped = false;
index++;
continue;
}
isEscaped = true;
index++;
continue;
}
// check are we entering a repeat pattern section that may include a quantifier
// Format = "(LL){n,m}" = repeat xx pattern 4 times.
if (!isEscaped && ch == _Section_Start)
{
AppendContentFromSectionExpression(sb, pattern, ref index, namedPatterns);
continue; // skip to next character - index has already been forwarded to new position
}
// check are we entering a set pattern that may include a quantifier
// Format = "[Vv]{4}" = generate 4 random ordered characters comprising of either V or v characters
if (!isEscaped && ch == _Set_Start)
{
AppendContentFromSetExpression(sb, pattern, ref index);
continue; // skip to next character - index has already been forwarded to new position
}
// check are we entering a repeat symbol section
// Format = "L{4}" = repeat L symbol 4 times.
bool repeatSymbol = index < pattern.Length -1 && pattern[index + 1] == _Quantifier_Start;
if (repeatSymbol)
{
AppendRepeatedSymbol(sb, pattern, ref index, isEscaped);
isEscaped = false;
continue; // skip to next character - index has already been forwarded to new position
}
// check if we have encountered a named pattern.
if (!isEscaped && ch == _NamedPattern_Start)
{
AppendContentFromNamedPattern(sb, pattern, ref index, namedPatterns);
continue;
}
AppendCharacterDerivedFromSymbol(sb, ch, isEscaped);
isEscaped = false;
index++;
}
return sb.ToString();
}
/// <summary>
/// Calculates the content from a repeated expression when the following form is enountered '[exp]{repeat}'.
/// </summary>
/// <param name="sb"></param>
/// <param name="characters"></param>
/// <param name="index"></param>
/// <param name="namedPatterns"></param>
private static void AppendContentFromSectionExpression(StringBuilder sb, string characters, ref int index, NamedPatterns namedPatterns)
{
var contentOptions = GetContentOptions(characters, ref index, _Section_Start, _Section_End);
var exp = contentOptions.Content;
if (contentOptions.ContainsAlternation) // containse alternations
{
GenerateFromAlternatedPattern(sb, namedPatterns, exp, contentOptions);
return;
}
if (contentOptions.IsNegated) // containse alternations
{
GenerateFromNegatedSet(sb, contentOptions);
return;
}
bool isEscaped = false;
for (int x = 0; x < contentOptions.Repeat; x++)
{
var curNdx = 0;
while (curNdx < exp.Length)
{
var chx = exp[curNdx];
if (chx == _Escape)
{
if (isEscaped)
{
isEscaped = false;
sb.Append(chx); // append escaped character.
curNdx++;
continue;
}
isEscaped = true;
curNdx++;
continue;
}
if (!isEscaped && chx == _Section_Start)
{
AppendContentFromSectionExpression(sb, exp, ref curNdx, namedPatterns);
continue; // skip to next character - index has already been forwarded to new position
}
// check are we entering a set pattern that may include a quantifier
// Format = "[Vv]{4}" = generate 4 random ordered characters comprising of either V or v characters
if (!isEscaped && chx == _Set_Start)
{
AppendContentFromSetExpression(sb, exp, ref curNdx);
continue; // skip to next character - index has already been forwarded to new position
}
if (!isEscaped && chx == _NamedPattern_Start)
{
AppendContentFromNamedPattern(sb, exp, ref curNdx, namedPatterns);
continue;
}
// check are we entering a repeat symbol section
// Format = "L{4}" = repeat L symbol 4 times.
bool repeatSymbol = curNdx < exp.Length - 1 && exp[curNdx + 1] == _Quantifier_Start;
if (repeatSymbol)
{
AppendRepeatedSymbol(sb, exp, ref curNdx, isEscaped);
isEscaped = false;
continue; // skip to next character - index has already been forwarded to new position
}
AppendCharacterDerivedFromSymbol(sb, chx, isEscaped);
curNdx++; // increment to move to next character.
isEscaped = false;
}
}
}
/// <summary>
/// Calculates the content from a repeated expression when the following form is enountered '[exp]{repeat}'.
/// </summary>
/// <param name="sb"></param>
/// <param name="characters"></param>
/// <param name="index"></param>
/// <param name="namedPatterns"></param>
private static void AppendContentFromSectionExpression(StringBuilder sb, string characters, ref int index, NamedPatterns namedPatterns)
{
var contentOptions = GetContentOptions(characters, ref index, _Section_Start, _Section_End);
var exp = contentOptions.Content;
if (contentOptions.ContainsAlternation) // containse alternations
{
GenerateFromAlternatedPattern(sb, namedPatterns, exp, contentOptions);
return;
}
if (contentOptions.IsNegated) // containse alternations
{
GenerateFromNegatedSet(sb, contentOptions);
return;
}
bool isEscaped = false;
for (int x = 0; x < contentOptions.Repeat; x++)
{
var curNdx = 0;
while(curNdx < exp.Length)
{
var chx = exp[curNdx];
if (chx == _Escape)
{
if (isEscaped)
{
isEscaped = false;
sb.Append(chx); // append escaped character.
curNdx++;
continue;
}
isEscaped = true;
curNdx++;
continue;
}
if (!isEscaped && chx == _Section_Start)
{
AppendContentFromSectionExpression(sb, exp, ref curNdx, namedPatterns);
continue; // skip to next character - index has already been forwarded to new position
}
// check are we entering a set pattern that may include a quantifier
// Format = "[Vv]{4}" = generate 4 random ordered characters comprising of either V or v characters
if (!isEscaped && chx == _Set_Start)
{
AppendContentFromSetExpression(sb, exp, ref curNdx);
continue; // skip to next character - index has already been forwarded to new position
}
if (!isEscaped && chx == _NamedPattern_Start)
{
AppendContentFromNamedPattern(sb, exp, ref curNdx, namedPatterns);
continue;
}
// check are we entering a repeat symbol section
// Format = "L{4}" = repeat L symbol 4 times.
bool repeatSymbol = curNdx < exp.Length - 1 && exp[curNdx + 1] == _Quantifier_Start;
if (repeatSymbol)
{
AppendRepeatedSymbol(sb, exp, ref curNdx, isEscaped);
isEscaped = false;
continue; // skip to next character - index has already been forwarded to new position
}
AppendCharacterDerivedFromSymbol(sb, chx, isEscaped);
curNdx++; // increment to move to next character.
isEscaped = false;
}
}
}
/// <summary>
/// Calculates the content from a repeated expression when the following form is enountered '[exp]{repeat}'.
/// </summary>
/// <param name="sb"></param>
/// <param name="characters"></param>
/// <param name="index"></param>
/// <param name="namedPatterns"></param>
/// <param name="random"></param>
private static void AppendContentFromSectionExpression(StringBuilder sb, string characters, ref int index, NamedPatterns namedPatterns, Random random)
{
var contentOptions = GetContentOptions(characters, ref index, _Section_Start.ToString(CultureInfo.InvariantCulture), _Section_End.ToString(CultureInfo.InvariantCulture), random);
var exp = contentOptions.Content;
if (contentOptions.ContainsAlternation) // contains alternations
{
GenerateFromAlternatedPattern(sb, namedPatterns, exp, contentOptions, random);
return;
}
for (int x = 0; x < contentOptions.Repeat; x++)
{
ProcessPattern(sb, exp, namedPatterns, random);
}
}
private static void AppendContentFromNamedPattern(StringBuilder sb, string characters, ref int index, NamedPatterns namedPatterns)
{
var ndx = index;
var tuple = GetContentOptions(characters, ref index, _NamedPattern_Start, _NamedPattern_End);
if (namedPatterns.HasPattern(tuple.Content)) // $namedPattern;
{
sb.Append(GenerateFromPattern(namedPatterns.GetPattern(tuple.Content).Pattern, namedPatterns));
}
else
{
var msg = BuildErrorSnippet(characters, ndx);
msg = "Found named pattern placeholder '" + tuple.Content + "' but was not provided with a corresponding pattern Check Named Patterns file." + Environment.NewLine + msg;
throw new GenerationException(msg);
}
}
private static void GenerateFromAlternatedPattern(StringBuilder sb, NamedPatterns namedPatterns, string exp, ContentOptions contentOptions)
{
var alternates = exp.Split(_Alternation);
for (int x = 0; x < contentOptions.Repeat; x++)
{
exp = alternates[Random.Next(0, alternates.Length)];
sb.Append(GenerateFromPattern(exp, namedPatterns));
}
}
private static void AppendPatternsFromConfigToCollection(GenerationConfig config, NamedPatterns patternCollection)
{
if (config.PatternFiles == null)
{
return;
}
foreach (var patternFile in config.PatternFiles)
{
var correctedPath = FileReader.GetPatternFilePath(patternFile);
try
{
var patt = FileReader.LoadNamedPatterns(correctedPath);
foreach (var pattern in patt.Patterns)
{
patternCollection.Patterns.Add(pattern);
}
}
catch (Exception ex)
{
throw new GenerationException("Error loading PatternFile:" + patternFile + "\n\n" + ex.Message);
}
}
}
/// <summary>
/// Takes in a string that contains 0 or more <<placeholder>> values and replaces the placeholder item with the expression it defines.
/// </summary>
/// <param name="template"></param>
/// <param name="namedPatterns"></param>
/// <param name="generationConfig"></param>
/// <returns></returns>
public static string GenerateFromTemplate(string template, NamedPatterns namedPatterns, GenerationConfig generationConfig)
{
int index = 0;
// CONFIG
if (generationConfig == null)
{
generationConfig = LoadAndRemoveConfigFromTemplate(ref template);
}
if (generationConfig == null)
{
generationConfig = new GenerationConfig();
}
var random = generationConfig.Random;
// PATTERNS
var generationPatterns = LoadDefaultNamedPatterns(generationConfig);
// Load provided ones as well if there are any.
if (namedPatterns != null && namedPatterns.Patterns != null)
{
namedPatterns.Patterns.ForEach(generationPatterns.Patterns.Add);
}
// Load all from the PatternFiles in config
AppendPatternsFromConfigToCollection(generationConfig, generationPatterns);
var sb = new StringBuilder();
while (index < template.Length)
{
// Find our next placeholder
int start = FindPositionOfNext(template, index, _Placeholder_Start, _Placeholder_End);
if (start == -1)
{
sb.Append(template.Substring(index)); //add remaining string.
break; // all done!
}
bool isEscaped = IsEscaped(template, start); //start >= 1 && template[start - 1].Equals(_Escape);
if (isEscaped)
{
start = start - 1;
}
sb.Append(template.Substring(index, start - index)); // Append everything up to start as it is.
if (isEscaped)
{
start = start + 1;
}
start = start + _Placeholder_Start.Length; // move past '<<' to start of expression
int end = FindPositionOfNext(template, start, _Placeholder_End, _Placeholder_Start); // find end of placeholder
if (end == -1)
{
throw new GenerationException("Unable to find closing placeholder after " + start);
}
var pattern = template.Substring(start, end - start); // grab our expression
if (isEscaped)
{
sb.Append("<<" + pattern + ">>");
}
else
{
GenerateFromPattern(sb, pattern, generationPatterns, null, random); // generate value from expression
}
index = end + 2; // update our index.
}
return(sb.ToString());
}
/// <summary>
/// Takes in a string that contains 0 or more <<placeholder>> values and replaces the placeholder item with the expression it defines.
/// </summary>
/// <param name="template"></param>
/// <param name="namedPatterns"></param>
/// <returns></returns>
public static string GenerateFromTemplate(string template, NamedPatterns namedPatterns)
{
return(GenerateFromTemplate(template, namedPatterns, null));
}
/// <summary>
///
/// </summary>
/// <param name="pattern">
/// The format of the text produced. 15 random characters is the default.
/// . - An uppercase or lowercase letter or number.
/// w - Any Letter.
/// L - An uppercase Letter.
/// l - A lowercase letter.
/// V - An uppercase Vowel.
/// v - A lowercase vowel.
/// C - An uppercase Consonant.
/// c - A lowercase consonant.
/// n - Any number, 1-9.
/// d - Any number, 0-9.
/// -------
/// Patterns can be produced:
/// "\.{10}" will produce a random string 10 characters long.
/// </param>
/// <param name="namedPatterns"></param>
/// <returns></returns>
public static string GenerateFromPattern(string pattern, NamedPatterns namedPatterns)
{
if (pattern == null)
{
throw new GenerationException("Argument 'pattern' cannot be null.");
}
var sb = new StringBuilder();
bool isEscaped = false;
int index = 0;
while (index < pattern.Length)
{
char ch = pattern[index];
// check for escape chars for next part
if (ch == _Escape)
{
if (isEscaped)
{
sb.Append(@"\");
isEscaped = false;
index++;
continue;
}
isEscaped = true;
index++;
continue;
}
// check are we entering a repeat pattern section that may include a quantifier
// Format = "(LL){n,m}" = repeat xx pattern 4 times.
if (!isEscaped && ch == _Section_Start)
{
AppendContentFromSectionExpression(sb, pattern, ref index, namedPatterns);
continue; // skip to next character - index has already been forwarded to new position
}
// check are we entering a set pattern that may include a quantifier
// Format = "[Vv]{4}" = generate 4 random ordered characters comprising of either V or v characters
if (!isEscaped && ch == _Set_Start)
{
AppendContentFromSetExpression(sb, pattern, ref index);
continue; // skip to next character - index has already been forwarded to new position
}
// check are we entering a repeat symbol section
// Format = "L{4}" = repeat L symbol 4 times.
bool repeatSymbol = index < pattern.Length - 1 && pattern[index + 1] == _Quantifier_Start;
if (repeatSymbol)
{
AppendRepeatedSymbol(sb, pattern, ref index, isEscaped);
isEscaped = false;
continue; // skip to next character - index has already been forwarded to new position
}
// check if we have encountered a named pattern.
if (!isEscaped && ch == _NamedPattern_Start)
{
AppendContentFromNamedPattern(sb, pattern, ref index, namedPatterns);
continue;
}
AppendCharacterDerivedFromSymbol(sb, ch, isEscaped);
isEscaped = false;
index++;
}
return(sb.ToString());
}
/// <summary>
/// Takes in a string that contains 0 or more <<placeholder>> values and replaces the placeholder item with the expression it defines.
/// </summary>
/// <param name="template"></param>
/// <param name="namedPatterns"></param>
/// <returns></returns>
public static string GenerateFromTemplate(string template, NamedPatterns namedPatterns)
{
var sb = new StringBuilder();
int index = 0;
while (index < template.Length)
{
// Find our next placeholder
int start = FindPositionOfNext(template, index, _Placeholder_Start, _Placeholder_End);
if (start == -1)
{
sb.Append(template.Substring(index)); //add remaining string.
break; // all done!
}
bool isEscaped = start > 2 && template[start - 1].Equals(_Escape) && template[start - 2].Equals(_Escape);
if (isEscaped) start = start - 2;
sb.Append(template.Substring(index, start - index)); // Append everything up to start as it is.
if (isEscaped) start = start + 2;
start = start + 2; // move past '<<' to start of expression
int end = FindPositionOfNext(template, start, _Placeholder_End, _Placeholder_Start); // find end of placeholder
if (end == -1)
{
throw new GenerationException("Unable to find closing placeholder after "+start);
}
var pattern = template.Substring(start, end - start); // grab our expression
if (isEscaped)
sb.Append("<<"+pattern+">>");
else
sb.Append(GenerateFromPattern(pattern, namedPatterns)); // generate value from expression
index = end+2; // update our index.
}
return sb.ToString();
}
