//------------------------------------------------------------
/// <summary>
/// 指定のトークンの種類であることを期待する。
/// 期待通りであればトークンを次に進めtrueを返す。
/// 期待通りでなければ指定のエラーを設定しfalseを返す。
/// </summary>
/// <param name="kind"></param>
/// <param name="errorKind"></param>
/// <returns></returns>
bool expectToken(Token.Kind aKind, ErrorKind aErrorKind)
{
if (currentToken().Value != aKind)
{
setErrorKind(aErrorKind);
return(false);
}
nextToken();
return(true);
}
void Expect(Token.Kind kind)
{
if (nextToken.kind == kind)
{
Next();
}
else
{
throw new SyntaxErrorException("saw " + nextToken.kind.ToString() + " where " +
kind.ToString() + " was expected");
}
}
public static bool IsLiteral(Token.Kind kind)
{
switch (kind)
{
case Token.Kind.Integer:
case Token.Kind.Float:
case Token.Kind.Boolean:
case Token.Kind.String:
case Token.Kind.Null:
case Token.Kind.Binary:
return(true);
default: return(false);
}
}
protected bool ExpectOptional(List <Token> tokens, ref int index, Token.Kind kind)
{
if (index >= tokens.Count)
{
throw new ParserException(tokens.Last(), ParserException.Kind.EndOfStream);
}
var token = tokens[index];
if (token.kind == kind)
{
index++;
return(true);
}
return(false);
}
protected string ExpectValue(List <Token> tokens, ref int index, Token.Kind kind, ParserException.Kind exception)
{
if (index >= tokens.Count)
{
throw new ParserException(tokens.Last(), ParserException.Kind.EndOfStream);
}
var token = tokens[index];
if (token.kind != kind)
{
throw new ParserException(token, exception);
}
index++;
return(token.text);
}
private void BreakIntoTokens(List <Token> tokens, ref string s, ref int baseIndex, ref int index, Token.Kind kind = Token.Kind.Invalid)
{
if (s.Length > 0)
{
var token = kind != Token.Kind.Invalid ? new Token(kind, s, baseIndex) : Tokenize(s, baseIndex);
tokens.Add(token);
s = "";
}
baseIndex = index;
}
//------------------------------------------------------------
// コンストラクタ。
public FirstTokenTestRecipe(string aCode, Token.Kind aTokenKind)
{
Code = aCode;
TokenKind = aTokenKind;
}
/// <summary>
/// Gets the <see cref="ParseRule"/> for a given kind of token.
/// </summary>
/// <param name="kind">The kind of token that is associated with the desired <see cref="ParseRule"/></param>
/// <returns>The <see cref="ParseRule"/> associated with the given kind of token.</returns>
private static ParseRule GetRule(Token.Kind kind)
{
return(parseRules[(int)kind]);
}
