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https://github.com/ivabus/feval
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7.7 KiB
7.7 KiB
fEval
Fast EVALuator
Simple command line tool, that helps you to fastly evaluate expressions. Based on evalexpr crate.
Operators
Supported binary operators:
| Operator | Precedence | Description |
|---|---|---|
| ^ | 120 | Exponentiation |
| * | 100 | Product |
| / | 100 | Division (integer if both arguments are integers, otherwise float) |
| % | 100 | Modulo (integer if both arguments are integers, otherwise float) |
| + | 95 | Sum or String Concatenation |
| - | 95 | Difference |
| < | 80 | Lower than |
| > | 80 | Greater than |
| <= | 80 | Lower than or equal |
| >= | 80 | Greater than or equal |
| == | 80 | Equal |
| != | 80 | Not equal |
| && | 75 | Logical and |
| || | 70 | Logical or |
| = | 50 | Assignment |
| += | 50 | Sum-Assignment or String-Concatenation-Assignment |
| -= | 50 | Difference-Assignment |
| *= | 50 | Product-Assignment |
| /= | 50 | Division-Assignment |
| %= | 50 | Modulo-Assignment |
| ^= | 50 | Exponentiation-Assignment |
| &&= | 50 | Logical-And-Assignment |
| ||= | 50 | Logical-Or-Assignment |
| , | 40 | Aggregation |
| ; | 0 | Expression Chaining |
Supported unary operators:
| Operator | Precedence | Description |
|---|---|---|
| - | 110 | Negation |
| ! | 110 | Logical not |
Functions
| Identifier | Argument Amount | Argument Types | Description |
|---|---|---|---|
min |
>= 1 | Numeric | Returns the minimum of the arguments |
max |
>= 1 | Numeric | Returns the maximum of the arguments |
len |
1 | String/Tuple | Returns the character length of a string, or the amount of elements in a tuple (not recursively) |
floor |
1 | Numeric | Returns the largest integer less than or equal to a number |
round |
1 | Numeric | Returns the nearest integer to a number. Rounds half-way cases away from 0.0 |
ceil |
1 | Numeric | Returns the smallest integer greater than or equal to a number |
if |
3 | Boolean, Any, Any | If the first argument is true, returns the second argument, otherwise, returns the third |
typeof |
1 | Any | returns "string", "float", "int", "boolean", "tuple", or "empty" depending on the type of the argument |
math::is_nan |
1 | Numeric | Returns true if the argument is the floating-point value NaN, false if it is another floating-point value, and throws an error if it is not a number |
math::is_finite |
1 | Numeric | Returns true if the argument is a finite floating-point number, false otherwise |
math::is_infinite |
1 | Numeric | Returns true if the argument is an infinite floating-point number, false otherwise |
math::is_normal |
1 | Numeric | Returns true if the argument is a floating-point number that is neither zero, infinite, subnormal, or NaN, false otherwise |
math::ln |
1 | Numeric | Returns the natural logarithm of the number |
math::log |
2 | Numeric, Numeric | Returns the logarithm of the number with respect to an arbitrary base |
math::log2 |
1 | Numeric | Returns the base 2 logarithm of the number |
math::log10 |
1 | Numeric | Returns the base 10 logarithm of the number |
math::exp |
1 | Numeric | Returns e^(number), (the exponential function) |
math::exp2 |
1 | Numeric | Returns 2^(number) |
math::pow |
2 | Numeric, Numeric | Raises a number to the power of the other number |
math::cos |
1 | Numeric | Computes the cosine of a number (in radians) |
math::acos |
1 | Numeric | Computes the arccosine of a number. The return value is in radians in the range [0, pi] or NaN if the number is outside the range [-1, 1] |
math::cosh |
1 | Numeric | Hyperbolic cosine function |
math::acosh |
1 | Numeric | Inverse hyperbolic cosine function |
math::sin |
1 | Numeric | Computes the sine of a number (in radians) |
math::asin |
1 | Numeric | Computes the arcsine of a number. The return value is in radians in the range [-pi/2, pi/2] or NaN if the number is outside the range [-1, 1] |
math::sinh |
1 | Numeric | Hyperbolic sine function |
math::asinh |
1 | Numeric | Inverse hyperbolic sine function |
math::tan |
1 | Numeric | Computes the tangent of a number (in radians) |
math::atan |
1 | Numeric | Computes the arctangent of a number. The return value is in radians in the range [-pi/2, pi/2] |
math::atan2 |
2 | Numeric, Numeric | Computes the four quadrant arctangent in radians |
math::tanh |
1 | Numeric | Hyperbolic tangent function |
math::atanh |
1 | Numeric | Inverse hyperbolic tangent function. |
math::sqrt |
1 | Numeric | Returns the square root of a number. Returns NaN for a negative number |
math::cbrt |
1 | Numeric | Returns the cube root of a number |
math::hypot |
2 | Numeric | Calculates the length of the hypotenuse of a right-angle triangle given legs of length given by the two arguments |
str::to_lowercase |
1 | String | Returns the lower-case version of the string |
str::to_uppercase |
1 | String | Returns the upper-case version of the string |
str::trim |
1 | String | Strips whitespace from the start and the end of the string |
str::from |
>= 0 | Any | Returns passed value as string |
bitand |
2 | Int | Computes the bitwise and of the given integers |
bitor |
2 | Int | Computes the bitwise or of the given integers |
bitxor |
2 | Int | Computes the bitwise xor of the given integers |
bitnot |
1 | Int | Computes the bitwise not of the given integer |
shl |
2 | Int | Computes the given integer bitwise shifted left by the other given integer |
shr |
2 | Int | Computes the given integer bitwise shifted right by the other given integer |
Constants
| Identifier | Value | Description |
|---|---|---|
math::pi |
3.141592653589793 (std::f64::consts::PI) |
Pi |
math::e |
2.718281828459045 (std::f64::consts::E) |
Euler's number |
License
This project is primarily distributed under the terms of the MIT license.