| public LookAhead ( String str, bool ignoreCase ) : bool | ||
| str | String | The string searching for. |
| ignoreCase | bool | True if case is to be ignored. |
| Результат | bool | |
/// <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);
}
}
}
/// <summary>
/// Parse the given line.
/// </summary>
/// <param name="line">The line to parse.</param>
/// <returns>The parsed probability.</returns>
public ParsedProbability Parse(String line)
{
ParsedProbability result = new ParsedProbability();
SimpleParser parser = new SimpleParser(line);
parser.EatWhiteSpace();
if (!parser.LookAhead("P(", true))
{
throw new EncogError("Bayes table lines must start with P(");
}
parser.Advance(2);
// handle base
AddEvents(parser, result.BaseEvents, "|,)=[]");
// handle conditions
if (parser.Peek() == '|')
{
parser.Advance();
AddEvents(parser, result.GivenEvents, ",)=[]");
}
if (parser.Peek() != ')')
{
throw new BayesianError("Probability not properly terminated.");
}
return result;
}
/// <summary>
/// Construct a basic template object.
/// </summary>
/// <param name="thePrecedence">The precedence.</param>
/// <param name="theSignature">The opcode signature.</param>
/// <param name="theType">The opcode type.</param>
/// <param name="isVariable">True, if this opcode is a variable.</param>
/// <param name="theDataSize">The data size kept for this opcode.</param>
/// <param name="theEvaluate">The evaluator delegate.</param>
/// <param name="theIsPossibleReturnType">The return type delegate.</param>
/// <param name="theRandomize">The randomizer delegate.</param>
public BasicTemplate(int thePrecedence, String theSignature,
NodeType theType, bool isVariable,
int theDataSize,
DelEvaluate theEvaluate,
DelIsPossibleReturnType theIsPossibleReturnType,
DelRandomize theRandomize)
{
_precedence = thePrecedence;
_signature = theSignature;
_varValue = isVariable;
_dataSize = theDataSize;
_nodeType = theType;
_delEvaluate = theEvaluate;
_delIsPossibleReturnType = theIsPossibleReturnType;
_delRandomize = theRandomize;
if (theSignature.Trim().Equals("("))
{
// special case, we add a left-paren for the shunting yard alg.
_name = theSignature;
_returnValue = null;
}
else
{
// non-special case, find the name of the function/operator
var parser = new SimpleParser(theSignature);
bool pass = false;
parser.EatWhiteSpace();
_name = parser.ReadToChars("(").Trim();
parser.Advance();
bool done = false;
while (!done)
{
if (parser.Peek() == ')')
{
parser.Advance();
done = true;
}
else if (parser.Peek() == ':')
{
parser.Advance();
pass = true;
}
else if (parser.Peek() == '{')
{
ParamTemplate temp = ReadParam(parser);
temp.PassThrough = pass;
pass = false;
_param.Add(temp);
}
else
{
parser.Advance();
if (parser.EOL())
{
throw new EncogError("Invalid opcode template.");
}
}
}
// get the return type
parser.EatWhiteSpace();
if (!parser.LookAhead(":", true))
{
throw new EACompileError("Return type not specified.");
}
parser.Advance();
parser.EatWhiteSpace();
_returnValue = ReadParam(parser);
}
}
/// <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>
/// Parse parameters.
/// </summary>
///
/// <param name="line">The line to parse.</param>
/// <returns>The parsed values.</returns>
public static IDictionary<String, String> ParseParams(String line)
{
IDictionary<String, String> result = new Dictionary<String, String>();
var parser = new SimpleParser(line);
while (!parser.EOL())
{
String name = ParseName(parser)
.ToUpper();
parser.EatWhiteSpace();
if (!parser.LookAhead("=", false))
{
throw new EncogError("Missing equals(=) operator.");
}
parser.Advance();
String v = ParseValue(parser);
result[name.ToUpper()] = v;
if (!parser.ParseThroughComma())
{
break;
}
}
return result;
}