public void TestCommasAndCurlyBraces()
{
var expression = "{0,1} + {0.5*2, (0.5 + 0.5)}";
var expected = new Token[] {
new Token { Type = TokenType.Paren, Text = "{" },
new Token { Type = TokenType.Number, Text = "0" },
new Token { Type = TokenType.Comma, Text = "," },
new Token { Type = TokenType.Number, Text = "1" },
new Token { Type = TokenType.Paren, Text = "}" },
new Token { Type = TokenType.Operator, Text = "+" },
new Token { Type = TokenType.Paren, Text = "{" },
new Token { Type = TokenType.Number, Text = "0.5" },
new Token { Type = TokenType.Operator, Text = "*" },
new Token { Type = TokenType.Number, Text = "2" },
new Token { Type = TokenType.Comma, Text = "," },
new Token { Type = TokenType.Paren, Text = "(" },
new Token { Type = TokenType.Number, Text = "0.5" },
new Token { Type = TokenType.Operator, Text = "+" },
new Token { Type = TokenType.Number, Text = "0.5" },
new Token { Type = TokenType.Paren, Text = ")" },
new Token { Type = TokenType.Paren, Text = "}" },
};
var tokens = Parser.Parse(expression).ToArray();
Assert.AreEqual(expected, tokens);
}
public void TestBasicExpression()
{
var expression = "a + b / c * d";
var expected = new Token[] {
new Token { Type = TokenType.Identifier, Text = "a" },
new Token { Type = TokenType.Operator, Text = "+" },
new Token { Type = TokenType.Identifier, Text = "b" },
new Token { Type = TokenType.Operator, Text = "/" },
new Token { Type = TokenType.Identifier, Text = "c" },
new Token { Type = TokenType.Operator, Text = "*" },
new Token { Type = TokenType.Identifier, Text = "d" }
};
var tokens = Parser.Parse(expression).ToArray();
Assert.AreEqual(expected, tokens);
}
public void TestMultiCharacterOperators()
{
var expression = "a >= b != c";
var expected = new Token[] {
new Token { Type = TokenType.Identifier, Text = "a" },
new Token { Type = TokenType.Operator, Text = ">=" },
new Token { Type = TokenType.Identifier, Text = "b" },
new Token { Type = TokenType.Operator, Text = "!=" },
new Token { Type = TokenType.Identifier, Text = "c" }
};
var tokens = Parser.Parse(expression).ToArray();
Assert.AreEqual(expected, tokens);
}
public void TestComplexExpression()
{
var expression = "(obj.field + (4 * 2)) > 0.5";
var expected = new Token[] {
new Token { Type = TokenType.Paren, Text = "(" },
new Token { Type = TokenType.Identifier, Text = "obj" },
new Token { Type = TokenType.Operator, Text = "." },
new Token { Type = TokenType.Identifier, Text = "field" },
new Token { Type = TokenType.Operator, Text = "+" },
new Token { Type = TokenType.Paren, Text = "(" },
new Token { Type = TokenType.Number, Text = "4" },
new Token { Type = TokenType.Operator, Text = "*" },
new Token { Type = TokenType.Number, Text = "2" },
new Token { Type = TokenType.Paren, Text = ")" },
new Token { Type = TokenType.Paren, Text = ")" },
new Token { Type = TokenType.Operator, Text = ">" },
new Token { Type = TokenType.Number, Text = "0.5" }
};
var tokens = Parser.Parse(expression).ToArray();
Assert.AreEqual(expected, tokens);
}
public void TestNumbers()
{
var expression = "1 + 2.503 + -37 - -15.6";
var expected = new Token[] {
new Token { Type = TokenType.Number, Text = "1" },
new Token { Type = TokenType.Operator, Text = "+" },
new Token { Type = TokenType.Number, Text = "2.503" },
new Token { Type = TokenType.Operator, Text = "+" },
new Token { Type = TokenType.Number, Text = "-37" },
new Token { Type = TokenType.Operator, Text = "-" },
new Token { Type = TokenType.Number, Text = "-15.6" }
};
var tokens = Parser.Parse(expression).ToArray();
Assert.AreEqual(expected, tokens);
}
public IEnumerable<Token> Parse (string expression) {
var current = new Token();
var matches = _Regex.Matches(expression);
foreach (var match in matches.Cast<Match>()) {
current.Text = match.ToString();
if (match.Groups[_Group_Number].Success)
current.Type = TokenType.Number;
else if (match.Groups[_Group_Identifier].Success)
current.Type = TokenType.Identifier;
else if (match.Groups[_Group_Operator].Success)
current.Type = TokenType.Operator;
else if (match.Groups[_Group_Paren].Success)
current.Type = TokenType.Paren;
else if (match.Groups[_Group_Comma].Success)
current.Type = TokenType.Comma;
yield return current;
}
}