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Document the aggregation operator

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Documents #4
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Sebastian Schmidt 2019-03-19 18:49:59 +02:00
parent 55e8b51228
commit 8e898044c0
2 changed files with 19 additions and 4 deletions
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6
README.md
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@ -104,8 +104,9 @@ Supported binary operators:
| * | 100 | Product | | <= | 80 | Lower than or equal |
| / | 100 | Division | | \>= | 80 | Greater than or equal |
| % | 100 | Modulo | | == | 80 | Equal |
| && | 75 | Logical and | | != | 80 | Not equal |
| &#124;&#124; | 70 | Logical or | ^ | 120 | Exponentiation |
| ^ | 120 | Exponentiation | | != | 80 | Not equal |
| && | 75 | Logical and | | , | 40 | Aggregation |
| &#124;&#124; | 70 | Logical or | | | | |
Supported unary operators:
@ -131,6 +132,7 @@ Integers are internally represented as `i64`, and floating point numbers are rep
Operators that take numbers as arguments can either take integers or floating point numbers.
If one of the arguments is a floating point number, all others are converted to floating point numbers as well, and the resulting value is a floating point number as well.
Otherwise, the result is an integer.
An exception to this is the exponentiation operator that always returns a floating point number.
Values have a precedence of 200.

17
src/lib.rs
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@ -93,8 +93,9 @@
//! | * | 100 | Product | | <= | 80 | Lower than or equal |
//! | / | 100 | Division | | \>= | 80 | Greater than or equal |
//! | % | 100 | Modulo | | == | 80 | Equal |
//! | && | 75 | Logical and | | != | 80 | Not equal |
//! | &#124;&#124; | 70 | Logical or | ^ | 120 | Exponentiation |
//! | ^ | 120 | Exponentiation | | != | 80 | Not equal |
//! | && | 75 | Logical and | | , | 40 | Aggregation |
//! | &#124;&#124; | 70 | Logical or | | | | |
//!
//! Supported unary operators:
//!
@ -103,6 +104,18 @@
//! | - | 110 | Negation |
//! | ! | 110 | Logical not |
//!
//! #### The Aggregation Operator
//!
//! The aggregation operator aggregates two values into a tuple.
//! If one of the values is a tuple already, the resulting tuple will be flattened.
//! Example:
//!
//! ```rust
//! use evalexpr::*;
//!
//! assert_eq!(eval("1, 2, 3"), Ok(Value::from(vec![Value::from(1), Value::from(2), Value::from(3)])));
//! ```
//!
//! ### Values
//!
//! Operators take values as arguments and produce values as results.