/// <summary>
/// Determines if a signature matches the block type of the parser
/// </summary>
/// <param name="signatureBody">The signature body</param>
/// <returns>True, if it matches; otherwise false</returns>
/// <remarks>
/// The rules for matching a variable adjuster are as follows:
///
/// - The trimmed signature body must not contain spaces
/// - The variable name must be valid
/// - Must end with the adjuster operand signature
/// </remarks>
public virtual bool Matches
(
string signatureBody
)
{
// Rule: must not contain spaces
if (signatureBody.Contains(" "))
{
return(false);
}
// Rule: the variable name must be valid
var variableName = ExtractVariableName
(
signatureBody
);
var isValidName = VariableParser.IsValidVariableName
(
variableName
);
// Rule: must end with the adjuster signature
var hasAdjuster = signatureBody.EndsWith
(
this.AdjusterSignature
);
if (false == hasAdjuster)
{
return(false);
}
return(true);
}
/// <summary>
/// Parses the code block signature into a code block object
/// </summary>
/// <param name="templateContent">The template content</param>
/// <param name="positionOffSet">The position offset index</param>
/// <param name="signature">The block signature</param>
/// <returns>The parsed code block</returns>
public virtual CodeBlock Parse
(
ref string templateContent,
ref int positionOffSet,
string signature
)
{
var body = UnwrapSignatureBody(signature);
var nameIndex = this.Prefix.Length;
var equalsIndex = body.IndexOf('=');
if (equalsIndex == -1)
{
var message = "The variable declaration '{0}' has invalid syntax.";
throw new NettleParseException
(
message.With(signature),
positionOffSet
);
}
// Extract the variable name and value signature
var variableName = body.Crop(nameIndex, equalsIndex - 1).Trim();
var valueSignature = body.Crop(equalsIndex + 1).Trim();
var type = ResolveType(valueSignature);
var value = type.ParseValue(valueSignature);
var isValidName = VariableParser.IsValidVariableName
(
variableName
);
if (false == isValidName)
{
var message = "The variable name '{0}' is invalid.";
throw new NettleParseException
(
message.With(variableName),
positionOffSet
);
}
var startPosition = positionOffSet;
var endPosition = (startPosition + signature.Length);
TrimTemplate
(
ref templateContent,
ref positionOffSet,
signature
);
var declaration = new VariableDeclaration()
{
Signature = signature,
StartPosition = startPosition,
EndPosition = endPosition,
VariableName = variableName,
AssignedValueSignature = valueSignature,
AssignedValue = value,
ValueType = type
};
return(declaration);
}