public Variable(string markup)
{
_markup = markup;
Name = null;
Filters = new List <Filter>();
Match match = MyRegex.Match(markup, string.Format(R.Q(@"\s*({0})(.*)"), Liquid.QuotedAssignFragment));
if (match.Success)
{
Name = match.Groups[1].Value;
Match filterMatch = MyRegex.Match(match.Groups[2].Value, string.Format(R.Q(@"{0}\s*(.*)"), Liquid.FilterSeparator));
if (filterMatch.Success)
{
foreach (string f in R.Scan(filterMatch.Value, FilterParser))
{
Match filterNameMatch = MyRegex.Match(f, R.Q(@"\s*(\w+)"));
if (filterNameMatch.Success)
{
string filterName = filterNameMatch.Groups[1].Value;
List <string> filterArgs = R.Scan(f, string.Format(R.Q(@"(?:{0}|{1})\s*({2})"), Liquid.FilterArgumentSeparator, Liquid.ArgumentSeparator, Liquid.QuotedFragment));
Filters.Add(new Filter(filterName, filterArgs.ToArray()));
}
}
}
}
}
/// <summary>
/// Uses the <tt>Liquid::TemplateParser</tt> regexp to tokenize the passed source
/// </summary>
/// <param name="source"></param>
/// <returns></returns>
internal static List <string> Tokenize(string source)
{
if (string.IsNullOrEmpty(source))
{
return(new List <string>());
}
// Trim leading whitespace.
source = MyRegex.Replace(source, string.Format(@"([ \t]+)?({0}|{1})-", Liquid.VariableStart, Liquid.TagStart), "$2");
// Trim trailing whitespace.
source = MyRegex.Replace(source, string.Format(@"-({0}|{1})(\n|\r\n|[ \t]+)?", Liquid.VariableEnd, Liquid.TagEnd), "$1");
List <string> tokens = Regex.Split(source, Liquid.TemplateParser).ToList();
// Trim any whitespace elements from the end of the array.
for (int i = tokens.Count - 1; i > 0; --i)
{
if (tokens[i] == string.Empty)
{
tokens.RemoveAt(i);
}
}
// Removes the rogue empty element at the beginning of the array
if (tokens[0] != null && tokens[0] == string.Empty)
{
tokens.Shift();
}
return(tokens);
}
/// <summary>
/// Remove all newlines from the string
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string StripNewlines(string input)
{
return(input.IsNullOrWhiteSpace()
? input
: MyRegex.Replace(input, @"(\r?\n)", String.Empty));
//: Regex.Replace(input, Environment.NewLine, string.Empty);
}
/// <summary>
/// Replace occurrences of a string with another
/// </summary>
/// <param name="input"></param>
/// <param name="string"></param>
/// <param name="replacement"></param>
/// <returns></returns>
public static string Replace(string input, string @string, string replacement = "")
{
if (string.IsNullOrEmpty(input) || string.IsNullOrEmpty(@string))
{
return(input);
}
return(string.IsNullOrEmpty(input)
? input
: MyRegex.Replace(input, @string, replacement));
}
/// <summary>
/// Add <br /> tags in front of all newlines in input string
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string NewlineToBr(string input)
{
return(input.IsNullOrWhiteSpace()
? input
: MyRegex.Replace(input, @"(\r?\n)", "<br />$1"));
}
public static string StripHtml(string input)
{
return(input.IsNullOrWhiteSpace()
? input
: MyRegex.Replace(input, @"<.*?>", string.Empty));
}
/// <summary>
/// Resolves namespaced queries gracefully.
///
/// Example
///
/// @context['hash'] = {"name" => 'tobi'}
/// assert_equal 'tobi', @context['hash.name']
/// assert_equal 'tobi', @context['hash["name"]']
/// </summary>
/// <param name="markup"></param>
/// <returns></returns>
private object Variable(string markup)
{
List <string> parts = R.Scan(markup, Liquid.VariableParser);
Regex squareBracketed = MyRegex.GetCachedRegex(R.Q(@"^\[(.*)\]$"));
string firstPart = parts.Shift();
Match firstPartSquareBracketedMatch = squareBracketed.Match(firstPart);
if (firstPartSquareBracketedMatch.Success)
{
firstPart = Resolve(firstPartSquareBracketedMatch.Groups[1].Value).ToString();
}
object @object;
if ((@object = FindVariable(firstPart)) != null)
{
foreach (string forEachPart in parts)
{
Match partSquareBracketedMatch = squareBracketed.Match(forEachPart);
bool partResolved = partSquareBracketedMatch.Success;
object part = forEachPart;
if (partResolved)
{
part = Resolve(partSquareBracketedMatch.Groups[1].Value);
}
// If object is a KeyValuePair, we treat it a bit differently - we might be rendering
// an included template.
if (@object is KeyValuePair <string, object> && ((KeyValuePair <string, object>)@object).Key == (string)part)
{
object res = ((KeyValuePair <string, object>)@object).Value;
@object = Liquidize(res);
}
// If object is a hash- or array-like object we look for the
// presence of the key and if its available we return it
else if (IsHashOrArrayLikeObject(@object, part))
{
// If its a proc we will replace the entry with the proc
object res = LookupAndEvaluate(@object, part);
@object = Liquidize(res);
}
// Some special cases. If the part wasn't in square brackets and
// no key with the same name was found we interpret following calls
// as commands and call them on the current object
else if (!partResolved && (@object is IEnumerable) && ((part as string) == "size" || (part as string) == "first" || (part as string) == "last"))
{
var castCollection = ((IEnumerable)@object).Cast <object>();
if ((part as string) == "size")
{
@object = castCollection.Count();
}
else if ((part as string) == "first")
{
@object = castCollection.FirstOrDefault();
}
else if ((part as string) == "last")
{
@object = castCollection.LastOrDefault();
}
}
// No key was present with the desired value and it wasn't one of the directly supported
// keywords either. The only thing we got left is to return nil
else
{
return(null);
}
// If we are dealing with a drop here we have to
if (@object is IContextAware)
{
((IContextAware)@object).Context = this;
}
}
}
return(@object);
}
/// <summary>
/// Look up variable, either resolve directly after considering the name. We can directly handle
/// Strings, digits, floats and booleans (true,false). If no match is made we lookup the variable in the current scope and
/// later move up to the parent blocks to see if we can resolve the variable somewhere up the tree.
/// Some special keywords return symbols. Those symbols are to be called on the rhs object in expressions
///
/// Example:
///
/// products == empty #=> products.empty?
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
private object Resolve(string key)
{
switch (key)
{
case null:
case "nil":
case "null":
case "":
return(null);
case "true":
return(true);
case "false":
return(false);
case "blank":
return(new Symbol(o => o is IEnumerable && !((IEnumerable)o).Cast <object>().Any()));
case "empty":
return(new Symbol(o => o is IEnumerable && !((IEnumerable)o).Cast <object>().Any()));
}
// Single quoted strings.
Match match = MyRegex.Match(key, R.Q(@"^'(.*)'$"));
if (match.Success)
{
return(match.Groups[1].Value);
}
// Double quoted strings.
match = MyRegex.Match(key, R.Q(@"^""(.*)""$"));
if (match.Success)
{
return(match.Groups[1].Value);
}
// Integer.
match = MyRegex.Match(key, R.Q(@"^([+-]?\d+)$"));
if (match.Success)
{
return(Convert.ToInt32(match.Groups[1].Value));
}
// Ranges.
match = MyRegex.Match(key, R.Q(@"^\((\S+)\.\.(\S+)\)$"));
if (match.Success)
{
return(Range.Inclusive(Convert.ToInt32(Resolve(match.Groups[1].Value)),
Convert.ToInt32(Resolve(match.Groups[2].Value))));
}
// Floats.
match = MyRegex.Match(key, R.Q(@"^([+-]?\d[\d\.|\,]+)$"));
if (match.Success)
{
// For cultures with "," as the decimal separator, allow
// both "," and "." to be used as the separator.
// First try to parse using current culture.
float result;
if (float.TryParse(match.Groups[1].Value, out result))
{
return(result);
}
// If that fails, try to parse using invariant culture.
return(float.Parse(match.Groups[1].Value, CultureInfo.InvariantCulture));
}
return(Variable(key));
}
