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