/// <summary>
/// Parse a value.
/// </summary>
///
/// <param name="parser">The parser to use.</param>
/// <returns>The newly parsed value.</returns>
private static String ParseValue(SimpleParser parser)
{
bool quoted = false;
var str = new StringBuilder();
parser.EatWhiteSpace();
if (parser.Peek() == '\"')
{
quoted = true;
parser.Advance();
}
while (!parser.EOL())
{
if (parser.Peek() == '\"')
{
if (quoted)
{
parser.Advance();
if (parser.Peek() == '\"')
{
str.Append(parser.ReadChar());
}
else
{
break;
}
}
else
{
str.Append(parser.ReadChar());
}
}
else if (!quoted &&
(parser.IsWhiteSpace() || (parser.Peek() == ',')))
{
break;
}
else
{
str.Append(parser.ReadChar());
}
}
return(str.ToString());
}
/// <summary>
/// Parse a name.
/// </summary>
///
/// <param name="parser">The parser to use.</param>
/// <returns>The name.</returns>
private static String ParseName(SimpleParser parser)
{
var result = new StringBuilder();
parser.EatWhiteSpace();
while (parser.IsIdentifier())
{
result.Append(parser.ReadChar());
}
return(result.ToString());
}
/// <summary>
/// Read the specified parameter.
/// </summary>
/// <param name="parser">The parser to use.</param>
/// <returns>The parsed parameter.</returns>
private ParamTemplate ReadParam(SimpleParser parser)
{
var result = new ParamTemplate();
if (!parser.LookAhead("{", true))
{
throw new EACompileError("Expected {");
}
parser.Advance();
bool done = false;
var buffer = new StringBuilder();
while (!done)
{
if (parser.Peek() == '}')
{
done = true;
parser.Advance();
}
else if (parser.Peek() == '{')
{
throw new EACompileError("Unexpected {");
}
else if (parser.Peek() == '{')
{
done = true;
parser.Advance();
}
else if (parser.Peek() == ',')
{
result.AddType(buffer.ToString().Trim().ToLower());
parser.Advance();
buffer.Length = 0;
}
else
{
buffer.Append(parser.ReadChar());
}
}
String s = buffer.ToString().Trim();
if (s.Length > 0)
{
result.AddType(s);
}
return(result);
}
/// <summary>
/// Add events, as they are pased.
/// </summary>
/// <param name="parser">The parser.</param>
/// <param name="results">The events found.</param>
/// <param name="delim">The delimiter to use.</param>
private void AddEvents(SimpleParser parser, IList <ParsedEvent> results, String delim)
{
bool done = false;
StringBuilder l = new StringBuilder();
while (!done && !parser.EOL())
{
char ch = parser.Peek();
if (delim.IndexOf(ch) != -1)
{
if (ch == ')' || ch == '|')
{
done = true;
}
ParsedEvent parsedEvent;
// deal with a value specified by + or -
if (l.Length > 0 && l[0] == '+')
{
String l2 = l.ToString().Substring(1);
parsedEvent = new ParsedEvent(l2.Trim());
parsedEvent.Value = "true";
}
else if (l.Length > 0 && l[0] == '-')
{
String l2 = l.ToString().Substring(1);
parsedEvent = new ParsedEvent(l2.Trim());
parsedEvent.Value = "false";
}
else
{
String l2 = l.ToString();
parsedEvent = new ParsedEvent(l2.Trim());
}
// parse choices
if (ch == '[')
{
parser.Advance();
int index = 0;
while (ch != ']' && !parser.EOL())
{
String labelName = parser.ReadToChars(":,]");
if (parser.Peek() == ':')
{
parser.Advance();
parser.EatWhiteSpace();
double min = double.Parse(parser.ReadToWhiteSpace());
parser.EatWhiteSpace();
if (!parser.LookAhead("to", true))
{
throw new BayesianError("Expected \"to\" in probability choice range.");
}
parser.Advance(2);
double max = CSVFormat.EgFormat.Parse(parser.ReadToChars(",]"));
parsedEvent.ChoiceList.Add(new ParsedChoice(labelName, min, max));
}
else
{
parsedEvent.ChoiceList.Add(new ParsedChoice(labelName, index++));
}
parser.EatWhiteSpace();
ch = parser.Peek();
if (ch == ',')
{
parser.Advance();
}
}
}
// deal with a value specified by =
if (parser.Peek() == '=')
{
parser.ReadChar();
String value = parser.ReadToChars(delim);
// BayesianEvent evt = this.network.getEvent(parsedEvent.getLabel());
parsedEvent.Value = value;
}
if (ch == ',')
{
parser.Advance();
}
if (ch == ']')
{
parser.Advance();
}
if (parsedEvent.Label.Length > 0)
{
results.Add(parsedEvent);
}
l.Length = 0;
}
else
{
parser.Advance();
l.Append(ch);
}
}
}
private string ReadName(SimpleParser parser)
{
using (var la = parser.LookAround())
{
if (!parser.ReadChar('_')
&& !parser.ReadChar(UnicodeCategory.LowercaseLetter)
&& !parser.ReadChar(UnicodeCategory.UppercaseLetter))
return null;
parser.ReadWhileCharOrEof(IsIdentifierChar);
la.Success();
return la.Text;
}
}
private static object ReadMethodCall(SimpleParser parser, object prevData, string name)
{
using (var la = parser.LookAround())
{
parser.SkipSpaces();
if (parser.ReadChar('('))
{
var prevExecutor = (INode)prevData;
var type = prevData == null ? parser.GlobalType : prevExecutor.Compile(parser.GlobalType);
var isMethodGroup = type.GetMethods().Any(m => m.Name == name);
if (isMethodGroup)
{
var paramValues = parser.ReadList<ValueBuilder, INode>(ReadListSeparator);
if (paramValues.Count == 1 && paramValues[0] == null)
paramValues.Clear();
parser.SkipSpaces();
if (parser.ReadChar(')'))
{
la.Success();
return new Call { Element = prevExecutor, Name = name, Parameters = paramValues };
}
}
}
return null;
}
}
private static bool ReadListSeparator(SimpleParser parser)
{
parser.SkipSpaces();
return parser.ReadChar(',');
}
/// <summary>
/// Reads the code trying to extract the AST from it.
/// </summary>
/// <param name="parser">The parser object used to read the code.</param>
/// <param name="prevData">Previously parsed result. This is used to chain results together.</param>
/// <returns>Returns an object that results from parsing the code.</returns>
public override object Read(SimpleParser parser, object prevData)
{
var prevExecutor = (INode)prevData;
parser.SkipSpaces();
if (prevExecutor == null)
{
var name = this.ReadName(parser);
// this is a direct method call in the root
var call = ReadMethodCall(parser, null, name);
if (call != null)
return call;
// this is a global property
if (!string.IsNullOrWhiteSpace(name))
return new PropertyGet { Name = name, Element = null };
// this is an array construct
if (parser.ReadChar('{'))
{
var values = parser.ReadList<ValueBuilder, INode>(ReadListSeparator);
if (values.Count > 0)
{
parser.SkipSpaces();
if (!parser.ReadChar('}'))
return new Exception("Unterminated array construct.");
return new ArrayConstruct { Values = values };
}
}
// this is a precedence operator
if (parser.ReadChar('('))
{
var value = parser.Read<ValueBuilder, INode>();
if (value == null)
return new Exception("Syntax error.");
parser.SkipSpaces();
if (!parser.ReadChar(')'))
return new Exception("Unterminated precedence construct.");
return value;
}
// this is a number literal
var number = parser.ReadWhileCharOrEof(char.IsNumber);
if (number.Length > 0)
return new NumberLiteral { Data = number };
// this is a string literal
if (parser.ReadChar('"'))
{
var strBuilder = new StringBuilder();
while (true)
{
strBuilder.Append(parser.ReadWhileCharOrEof(ch => ch != '\\' && ch != '"'));
if (parser.Eof)
return new InvalidOperationException("String literal not terminated.");
if (parser.ReadChar('\\'))
{
if (parser.ReadChar('0')) strBuilder.Append('\0');
else if (parser.ReadChar('n')) strBuilder.Append('\n');
else if (parser.ReadChar('r')) strBuilder.Append('\r');
else if (parser.ReadChar('\\')) strBuilder.Append('\\');
else if (parser.ReadChar('"')) strBuilder.Append('"');
else
return new InvalidOperationException("Escape sequence not recognized.");
}
if (parser.ReadChar('"'))
break;
}
return new StringLiteral { Data = strBuilder.ToString() };
}
}
else
{
if (parser.ReadChar('.'))
{
var name = this.ReadName(parser);
// this is a direct method call in the previous element
var call = ReadMethodCall(parser, prevExecutor, name);
if (call != null)
return call;
if (!string.IsNullOrWhiteSpace(name))
return new PropertyGet { Name = name, Element = prevExecutor };
}
// indexer property
if (parser.ReadChar('['))
{
var indexValues = parser.ReadList<ValueBuilder, INode>(ReadListSeparator);
if (indexValues.Count == 0)
return new Exception("Index is missing.");
parser.SkipSpaces();
if (!parser.ReadChar(']'))
return new Exception("Unterminated indexer.");
return new IndexerGet { Element = prevExecutor, Indexes = indexValues };
}
// this only happens when calling a delegate
// direct method calls never fall here
if (parser.ReadChar('('))
{
var paramValues = parser.ReadList<ValueBuilder, INode>(ReadListSeparator);
parser.SkipSpaces();
if (parser.ReadChar(')'))
return new Call { Element = prevExecutor, Name = "Invoke", Parameters = paramValues };
}
if (parser.ReadChar('?'))
{
var trueValue = parser.Read<ValueBuilder, INode>();
parser.SkipSpaces();
if (!parser.ReadChar(':'))
throw new Exception("Missing ':' for ternary operator a?b:c.");
parser.SkipSpaces();
var falseValue = parser.Read<ValueBuilder, INode>();
return new TernaryInlineIf { Condition = prevExecutor, TrueValue = trueValue, FalseValue = falseValue };
}
var binOp = parser.ReadAnyStringAlternative("==", "!=", ">", "<", ">=", "<=", "&&", "||");
if (binOp != null)
{
var valueB = parser.Read<ValueBuilder, INode>();
return new BinaryBoolOps { ValueA = prevExecutor, ValueB = valueB, Operator = binOp };
}
}
return null;
}