public static AST.HashValue.Item Parse(CharStream stream)
{
var startingPos = stream.Position;
try
{
// check if a hash item is supposed to be a default
bool isDefault = stream.SkipIfPossible('*');
// parse the raw identifier (key)
var identifier = Identifier.Parse(stream, false);
// whitespace is optional
WhiteSpace.Parse(stream, true);
// the seperator char is required as it seperates the key and the value
stream.SkipCharacter(':');
// more optional whitespace
WhiteSpace.Parse(stream, true);
// get the actual value, which is identified by the key
var value = Value.Parse(stream);
return new AST.HashValue.Item(identifier, value, isDefault);
} catch (Exception e)
{
string msg = String.Format(
"something went wrong parsing a <hash_item> starting at {0}",
stream.ComputeDetailedPosition(startingPos));
throw new Exceptions.ParseException(msg, e);
}
}
public static AST.INode Parse(CharStream stream)
{
var startingPos = stream.Position;
try
{
// skip open char
stream.SkipCharacter('[');
// we need at least one index
var index = new AST.Index(ParseExpression(stream));
// others are optional
while (stream.SkipIfPossible(','))
{
index.AddIndex(ParseExpression(stream));
}
// skip close char
stream.SkipCharacter(']');
return index;
} catch (Exception e)
{
string msg = String.Format(
"something went wrong parsing an <index> starting at {0}",
stream.ComputeDetailedPosition(startingPos));
throw new Exceptions.ParseException(msg, e);
}
}
public static void Parse(
CharStream stream,
string identifier, Internal.LocaleContext.Builder builder)
{
var startingPos = stream.Position;
try
{
var macroAST = new AST.Macro(identifier);
stream.SkipCharacter('(');
WhiteSpace.Parse(stream, true);
// variables are optional,
// but we do have them, we need at least one (duh)
if (Expressions.Variable.Peek(stream))
{
macroAST.AddParameter(Macro.ParseVariable(stream));
// more than 1 is possible as well
while (stream.SkipIfPossible(','))
{
WhiteSpace.Parse(stream, true);
macroAST.AddParameter(Macro.ParseVariable(stream));
}
}
stream.SkipCharacter(')');
WhiteSpace.Parse(stream, false);
stream.SkipCharacter('{');
WhiteSpace.Parse(stream, true);
// Parse the Actual Macro Expression
macroAST.SetExpression(Expression.Parse(stream));
WhiteSpace.Parse(stream, true);
stream.SkipCharacter('}');
WhiteSpace.Parse(stream, true);
stream.SkipCharacter('>');
// return the fully parsed macro
try
{
var macro = (Objects.Macro)macroAST.Eval();
builder.AddMacro(identifier, macro);
} catch (Exception e)
{
throw new Exceptions.EvaluateException(
String.Format("couldn't evaluate `{0}`", macroAST.Display()),
e);
}
} catch (Exception e)
{
string msg = String.Format(
"something went wrong parsing a <macro> starting at {0}",
stream.ComputeDetailedPosition(startingPos));
throw new Exceptions.ParseException(msg, e);
}
}
public static AST.INode Parse(CharStream stream)
{
var startingPos = stream.Position;
try
{
AST.INode root;
if(!Property.PeekAndParse(stream, out root)) {
root = IdentifierExpression.Parse(stream);
}
stream.SkipString("::");
// we either have an expression or a simple identifier
AST.INode identifier;
if (stream.SkipIfPossible('['))
{
identifier = Expression.Parse(stream);
stream.SkipCharacter(']');
} else
{
identifier = new AST.Identifier(Identifier.Parse(stream, false));
}
// We can also have optionally a property expression,
// starting with a simple identifier or straight away with an expression
AST.PropertyExpression propertyExpression = null;
if (stream.SkipIfPossible('.'))
{
propertyExpression = Property.Parse(stream) as AST.PropertyExpression;
}
else if (stream.SkipIfPossible('['))
{
var expression = Expression.Parse(stream);
propertyExpression = new AST.PropertyExpression(expression);
stream.SkipCharacter(']');
Property.Parse(stream, propertyExpression);
}
return new AST.AttributeExpression(root, identifier, propertyExpression);
} catch (Exception e)
{
string msg = String.Format(
"something went wrong parsing an <property_expression> starting at {0}",
stream.ComputeDetailedPosition(startingPos));
throw new Exceptions.ParseException(msg, e);
}
}
public static void Parse(CharStream stream)
{
if (!stream.SkipIfPossible('/') || !(stream.SkipIfPossible('*')))
{
throw stream.CreateException(
"a comment has to be opened with '/*'");
}
char c;
string content = "";
while (stream.ReadNext(out c))
{
if (c == '*' && stream.SkipIfPossible('/'))
{
return;
}
content += c;
}
throw new ParseException(
"a comment entry was opened, but not closed",
stream.CreateEOFException());
}
public static AST.INode Parse(CharStream stream, AST.INode member)
{
var startingPos = stream.Position;
try
{
// skip opening tag
stream.SkipCharacter('(');
WhiteSpace.Parse(stream, true);
var call = new AST.CallExpression(member);
// parse arguments if possible
if (!stream.SkipIfPossible(')'))
{
call.AddParameter(ParseExpression(stream));
// but we can also have moreß
while (stream.SkipIfPossible(','))
{
call.AddParameter(ParseExpression(stream));
}
// skip closing tag
stream.SkipCharacter(')');
}
return call;
} catch (Exception e)
{
string msg = String.Format(
"something went wrong parsing an <call_expression> starting at {0}",
stream.ComputeDetailedPosition(startingPos));
throw new Exceptions.ParseException(msg, e);
}
}
public static AST.INode Parse(CharStream stream)
{
var startingPos = stream.Position;
try
{
if (stream.SkipIfPossible('('))
{
var e = Expression.Parse(stream);
stream.SkipCharacter(')');
return e;
} else
{ // than we /should/ have a primary expressions
return Primary.Parse(stream);
}
} catch (Exception e)
{
string msg = String.Format(
"something went wrong parsing an <parenthesis_expression> starting at {0}",
stream.ComputeDetailedPosition(startingPos));
throw new Exceptions.ParseException(msg, e);
}
}
public static AST.INode Parse(CharStream stream)
{
var startingPos = stream.Position;
try
{
// skip opening tag
stream.SkipCharacter('{');
// at least 1 hashItem is required with optional whitespace surrounding it
var hashValue = new AST.HashValue();
WhiteSpace.Parse(stream, true);
hashValue.AddItem(HashItem.Parse(stream));
WhiteSpace.Parse(stream, true);
// parse all other (optional) hashItems
while (stream.SkipIfPossible(','))
{
if (!HashValue.ParseHashItem(stream, hashValue))
{
// if we have a trailing comma, it will be break here
break;
}
}
// skip closing tag
stream.SkipCharacter('}');
return hashValue;
} catch (Exception e)
{
string msg = String.Format(
"something went wrong parsing a <hash_value> starting at {0}",
stream.ComputeDetailedPosition(startingPos));
throw new Exceptions.ParseException(msg, e);
}
}
public static void Parse(CharStream stream, Internal.LocaleContext.Builder builder)
{
var startingPos = stream.Position;
try
{
if (Comment.PeekAndParse(stream))
return;
// normally we keep the requirements of a format for a parser internal,
// but in this case we have the same start for both a <macro> and an <entity>
// so we simply have to make an exception in this case for performance reasons
if (stream.SkipIfPossible('<'))
{
var identifier = Identifier.Parse(stream, true);
if (Macro.PeekAndParse(stream, identifier, builder))
return;
// now it NEEDS to be a entitiy, else our input is simply invalid
// knowing that we are already on a path of no return
// because of the fact that we started parsing '<' and an identifier.
Entity.Parse(stream, identifier, builder);
} else
{
// it has to be an import statement at this point
ImportStatement.Parse(stream, builder);
}
} catch (Exception e)
{
string msg = String.Format(
"something went wrong parsing an <entry> starting at {0}",
stream.ComputeDetailedPosition(startingPos));
throw new ParseException(msg, e);
}
}
