Comments (6)
Oh yes. It does indeed work. Sorry for the noise. And thanks for catching the implementation error :)
from expression.
This works for me. It seems like you were originally trying with infix (which wouldn't have worked), but postfix should (and does, when I tried it).
from expression.
(Also, it's not related to the question, but your implementation of fact() will never terminate if you give it a negative number)
from expression.
However it seems like plus operators afterwards aren't tolerated after a postfix:
let expression = Expression(
optimized,
constants: [
"π": Double.pi,
"ℇ": Darwin.M_E,
],
symbols: [
.function("log10", arity: 1): { log10($0[0]) },
.infix("()"): { $0[0] * $0[1] },
.infix("^"): { pow($0[0], $0[1]) },
.postfix("!"): { Double(fact(Int($0[0]))) },
.postfix("π"): { $0[0] * Double.pi },
.postfix("ℇ"): { $0[0] * Darwin.M_E },
.prefix("√"): { sqrt($0[0]) },
]
)
9!+1
should yield 362881
but it throws an error: Expression.Expression.Error error 3.
from expression.
This is a limitation of the parser. Because it supports arbitrary operators it can't tell that !+
isn't meant to be an infix operator in its own right.
I'll see if there's a way to make it more flexible, but in the meantime adding spaces should solve it:
9! + 1
from expression.
Yes adding spaces does the trick.
from expression.
Related Issues (20)
- Question: Overloading existing operators HOT 2
- Usage for macOS Apps (Swift 5.1/Xcode 11.2.1) HOT 3
- Equality of strings, substrings and characters HOT 1
- Order of operations question HOT 3
- Square brackets HOT 1
- when using the sample code it won't execute HOT 4
- Expression.parse("'\\n'") fails HOT 2
- AnyExpression using array variables can't be evaluated with error 0 HOT 1
- Expose AST HOT 1
- Test suite crashes on Xcode 13.3 / Swift 5.6 HOT 7
- Ability to use ^ instead of pow(x, y) HOT 4
- Question: Can multiplication be done with parentheses? HOT 1
- Function expression failed with string paramater which contains \ HOT 1
- Crash in Swift 5.7 when creating stringBounds error HOT 4
- Getting sub expressions during evaluation HOT 1
- Lazy evaluation of ternary operator's true/false cases HOT 1
- Question: Is implicit multiplication possible with Expression? HOT 5
- Support ^ as pow operator HOT 2
- Complex expressions are not working HOT 6
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from expression.