8 unstable releases (3 breaking)
| 0.4.2 | Jun 4, 2023 |
|---|---|
| 0.4.1 | May 31, 2023 |
| 0.3.0 | Jan 25, 2023 |
| 0.2.0 | Jan 25, 2023 |
| 0.1.2 | Jan 25, 2023 |
#1557 in Command line utilities
18KB
68 lines
fEval 
Fast EVALuator
Simple command line tool, that helps you to fastly evaluate expressions. Based on evalexpr crate.
Installation
cargo install feval
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 |
exit |
0 | None | Exits |
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.
Dependencies
~6.5MB
~129K SLoC