678 lines
17 KiB
Rust
678 lines
17 KiB
Rust
//! Eval is a powerful expression evaluator.
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//!
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//! Supported operators: `!` `!=` `""` `''` `()` `[]` `.` `,` `>` `<` `>=` `<=`
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//! `==` `+` `-` `*` `/` `%` `&&` `||` `n..m`.
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//!
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//! Built-in functions: `min()` `max()` `len()` `is_empty()` `array()`.
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//!
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//! ## Examples
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//!
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//! You can do mathematical calculations with supported operators:
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//!
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//! ```
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//! use eval::{eval, to_value};
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//!
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//! assert_eq!(eval("1 + 2 + 3"), Ok(to_value(6)));
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//! assert_eq!(eval("2 * 2 + 3"), Ok(to_value(7)));
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//! assert_eq!(eval("2 / 2 + 3"), Ok(to_value(4.0)));
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//! assert_eq!(eval("2 / 2 + 3 / 3"), Ok(to_value(2.0)));
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//! ```
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//!
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//! You can eval with context:
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//!
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//! ```
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//! use eval::{Expr, to_value};
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//!
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//! assert_eq!(Expr::new("foo == bar")
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//! .value("foo", true)
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//! .value("bar", true)
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//! .exec(),
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//! Ok(to_value(true)));
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//! ```
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//!
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//! You can access data like javascript by using `.` and `[]`. `[]` supports expression.
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//!
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//! ```
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//! use eval::{Expr, to_value};
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//! use std::collections::HashMap;
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//!
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//! let mut object = HashMap::new();
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//! object.insert("foos", vec!["Hello", "world", "!"]);
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//!
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//! assert_eq!(Expr::new("object.foos[2-1] == 'world'") // Access field `foos` and index `2-1`
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//! .value("object", object)
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//! .exec(),
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//! Ok(to_value(true)));
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//! ```
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//!
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//! You can eval with function:
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//!
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//! ```
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//! use eval::{Expr, to_value};
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//!
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//! assert_eq!(Expr::new("say_hello()")
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//! .function("say_hello", |_| Ok(to_value("Hello world!")))
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//! .exec(),
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//! Ok(to_value("Hello world!")));
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//! ```
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//!
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//! You can create an array with `array()`:
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//!
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//! ```
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//! use eval::{eval, to_value};
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//!
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//! assert_eq!(eval("array(1, 2, 3, 4, 5)"), Ok(to_value(vec![1, 2, 3, 4, 5])));
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//! ```
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//!
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//! You can create an integer array with `n..m`:
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//!
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//! ```
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//! use eval::{eval, to_value};
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//!
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//! assert_eq!(eval("0..5"), Ok(to_value(vec![0, 1, 2, 3, 4])));
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//! ```
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//!
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//! ## Built-in functions
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//!
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//! ### min()
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//! Accept multiple arguments and return the minimum value.
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//!
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//! ### max()
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//! Accept multiple arguments and return the maximum value.
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//!
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//! ### len()
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//! Accept single arguments and return the length of value. Only accept String, Array, Object and Null.
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//!
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//! ### is_empty()
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//! Accept single arguments and return a boolean. Check whether the value is empty or not.
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//!
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//! ### array()
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//! Accept multiple arguments and return an array.
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//!
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//!
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#![recursion_limit="100"]
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#![deny(missing_docs)]
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#![cfg_attr(all(feature = "unstable", test), feature(test))]
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#[macro_use]
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extern crate quick_error;
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extern crate serde;
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extern crate serde_json;
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mod math;
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mod function;
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mod operator;
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mod node;
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mod tree;
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mod error;
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mod builtin;
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mod expr;
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pub use expr::ExecOptions;
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pub use serde_json::Value;
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pub use error::Error;
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pub use function::Function;
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pub use expr::Expr;
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use std::collections::HashMap;
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use serde_json::to_value as json_to_value;
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use serde::Serialize;
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/// Convert variable to `serde_json::Value`
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pub fn to_value<S: Serialize>(v: S) -> Value {
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json_to_value(v).unwrap()
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}
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/// Custom context.
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pub type Context = HashMap<String, Value>;
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/// Custom contexts. The value of the last context is searched first.
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pub type Contexts = Vec<Context>;
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/// Custom functions.
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pub type Functions = HashMap<String, Function>;
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/// Evaluates the value of an expression.
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pub fn eval(expr: &str) -> Result<Value, Error> {
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Expr::new(expr).compile()?.exec()
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}
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type Compiled = Box<Fn(&[Context], &Functions) -> Result<Value, Error>>;
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#[cfg(test)]
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mod tests {
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use to_value;
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use error::Error;
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use Expr;
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use tree::Tree;
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use Value;
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use eval;
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use std::collections::HashMap;
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#[test]
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fn test_add() {
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assert_eq!(eval("2 + 3"), Ok(to_value(5)));
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}
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#[test]
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fn test_brackets_add() {
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assert_eq!(eval("(2 + 3) + (3 + 5)"), Ok(to_value(13)));
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}
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#[test]
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fn test_brackets_float_add() {
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assert_eq!(eval("(2 + 3.2) + (3 + 5)"), Ok(to_value(13.2)));
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}
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#[test]
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fn test_brackets_float_mul() {
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assert_eq!(eval("(2 + 3.2) * 5"), Ok(to_value(26.0)));
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}
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#[test]
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fn test_brackets_sub() {
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assert_eq!(eval("(4 - 3) * 5"), Ok(to_value(5)));
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}
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#[test]
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fn test_useless_brackets() {
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assert_eq!(eval("2 + 3 + (5)"), Ok(to_value(10)));
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}
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#[test]
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fn test_error_brackets_not_with_function() {
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assert_eq!(eval("5 + ()"), Err(Error::BracketNotWithFunction));
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}
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#[test]
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fn test_deep_brackets() {
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assert_eq!(eval("(2 + (3 + 4) + (6 + (6 + 7)) + 5)"), Ok(to_value(33)));
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}
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#[test]
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fn test_brackets_div() {
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assert_eq!(eval("(4 / (2 + 2)) * 5"), Ok(to_value(5.0)));
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}
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#[test]
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fn test_min() {
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assert_eq!(eval("min(30, 5, 245, 20)"), Ok(to_value(5)));
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}
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#[test]
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fn test_min_brackets() {
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assert_eq!(
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eval("(min(30, 5, 245, 20) * 10 + (5 + 5) * 5)"),
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Ok(to_value(100))
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);
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}
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#[test]
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fn test_min_and_mul() {
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assert_eq!(eval("min(30, 5, 245, 20) * 10"), Ok(to_value(50)));
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}
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#[test]
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fn test_max() {
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assert_eq!(eval("max(30, 5, 245, 20)"), Ok(to_value(245)));
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}
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#[test]
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fn test_max_brackets() {
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assert_eq!(
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eval("(max(30, 5, 245, 20) * 10 + (5 + 5) * 5)"),
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Ok(to_value(2500))
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);
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}
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#[test]
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fn test_max_and_mul() {
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assert_eq!(eval("max(30, 5, 245, 20) * 10"), Ok(to_value(2450)));
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}
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#[test]
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fn test_len_array() {
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assert_eq!(eval("len(array(2, 3, 4, 5, 6))"), Ok(to_value(5)));
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}
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#[test]
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fn test_null_and_number() {
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assert_eq!(eval("hos != 0"), Ok(to_value(true)));
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assert_eq!(eval("hos > 0"), Ok(to_value(false)));
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}
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#[test]
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fn test_len_string() {
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assert_eq!(eval("len('Hello world!')"), Ok(to_value(12)));
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}
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#[test]
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fn test_len_object() {
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let mut object = HashMap::new();
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object.insert("field1", "value1");
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object.insert("field2", "value2");
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object.insert("field3", "value3");
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assert_eq!(
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Expr::new("len(object)").value("object", object).exec(),
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Ok(to_value(3))
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);
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}
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#[test]
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fn test_brackets_1() {
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assert_eq!(eval("(5) + (min(3, 4, 5)) + 20"), Ok(to_value(28)));
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}
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#[test]
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fn test_brackets_2() {
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assert_eq!(eval("(((5) / 5))"), Ok(to_value(1.0)));
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}
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#[test]
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fn test_string_add() {
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assert_eq!(eval(r#""Hello"+", world!""#), Ok(to_value("Hello, world!")));
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}
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#[test]
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fn test_equal() {
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assert_eq!(eval("1 == 1"), Ok(to_value(true)));
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}
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#[test]
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fn test_not_equal() {
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assert_eq!(eval("1 != 2"), Ok(to_value(true)));
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}
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#[test]
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fn test_multiple_equal() {
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assert_eq!(eval("(1 == 2) == (2 == 3)"), Ok(to_value(true)));
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}
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#[test]
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fn test_multiple_not_equal() {
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assert_eq!(eval("(1 != 2) == (2 != 3)"), Ok(to_value(true)));
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}
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#[test]
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fn test_greater_than() {
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assert_eq!(eval("1 > 2"), Ok(to_value(false)));
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assert_eq!(eval("2 > 1"), Ok(to_value(true)));
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}
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#[test]
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fn test_less_than() {
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assert_eq!(eval("2 < 1"), Ok(to_value(false)));
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assert_eq!(eval("1 < 2"), Ok(to_value(true)));
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}
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#[test]
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fn test_greater_and_less() {
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assert_eq!(eval("(2 > 1) == (1 < 2)"), Ok(to_value(true)));
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}
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#[test]
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fn test_ge() {
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assert_eq!(eval("2 >= 1"), Ok(to_value(true)));
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assert_eq!(eval("2 >= 2"), Ok(to_value(true)));
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assert_eq!(eval("2 >= 3"), Ok(to_value(false)));
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}
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#[test]
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fn test_le() {
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assert_eq!(eval("2 <= 1"), Ok(to_value(false)));
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assert_eq!(eval("2 <= 2"), Ok(to_value(true)));
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assert_eq!(eval("2 <= 3"), Ok(to_value(true)));
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}
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#[test]
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fn test_quotes() {
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assert_eq!(eval(r#""1><2" + "3<>4""#), Ok(to_value("1><23<>4")));
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assert_eq!(eval(r#""1==2" + "3--4""#), Ok(to_value("1==23--4")));
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assert_eq!(eval(r#""1!=2" + "3>>4""#), Ok(to_value("1!=23>>4")));
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assert_eq!(eval(r#""><1!=2" + "3>>4""#), Ok(to_value("><1!=23>>4")));
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}
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#[test]
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fn test_single_quote() {
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assert_eq!(eval(r#"'1><2' + '3<>4'"#), Ok(to_value("1><23<>4")));
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assert_eq!(eval(r#"'1==2' + '3--4'"#), Ok(to_value("1==23--4")));
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assert_eq!(eval(r#"'1!=2' + '3>>4'"#), Ok(to_value("1!=23>>4")));
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assert_eq!(eval(r#"'!=1<>2' + '3>>4'"#), Ok(to_value("!=1<>23>>4")));
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}
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#[test]
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fn test_single_and_double_quote() {
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assert_eq!(
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eval(r#"' """" ' + ' """" '"#),
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Ok(to_value(r#" """" """" "#))
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);
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}
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#[test]
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fn test_double_and_single_quote() {
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assert_eq!(
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eval(r#"" '''' " + " '''' ""#),
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Ok(to_value(r#" '''' '''' "#))
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);
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}
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#[test]
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fn test_array() {
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assert_eq!(eval("array(1, 2, 3, 4)"), Ok(to_value(vec![1, 2, 3, 4])));
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}
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#[test]
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fn test_range() {
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assert_eq!(eval("0..5"), Ok(to_value(vec![0, 1, 2, 3, 4])));
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}
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#[test]
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fn test_range_and_min() {
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assert_eq!(eval("min(0..5)"), Ok(to_value(0)));
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}
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#[test]
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fn test_rem_1() {
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assert_eq!(eval("2 % 2"), Ok(to_value(0)));
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}
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#[test]
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fn test_rem_2() {
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assert_eq!(eval("5 % 56 % 5"), Ok(to_value(0)));
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}
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#[test]
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fn test_rem_3() {
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assert_eq!(eval("5.5 % 23"), Ok(to_value(5.5)));
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}
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#[test]
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fn test_rem_4() {
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assert_eq!(eval("23 % 5.5"), Ok(to_value(1.0)));
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}
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#[test]
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fn test_and_1() {
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assert_eq!(eval("3 > 2 && 2 > 1"), Ok(to_value(true)));
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}
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#[test]
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fn test_and_2() {
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assert_eq!(eval("3 == 2 && 2 == 1"), Ok(to_value(false)));
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}
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#[test]
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fn test_and_3() {
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assert_eq!(eval("3 > 2 && 2 == 1"), Ok(to_value(false)));
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}
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#[test]
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fn test_or_1() {
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assert_eq!(eval("3 > 2 || 2 > 1"), Ok(to_value(true)));
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}
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#[test]
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fn test_or_2() {
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assert_eq!(eval("3 < 2 || 2 < 1"), Ok(to_value(false)));
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}
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#[test]
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fn test_or_3() {
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assert_eq!(eval("3 > 2 || 2 < 1"), Ok(to_value(true)));
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}
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#[test]
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fn test_or_4() {
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assert_eq!(eval("3 < 2 || 2 > 1"), Ok(to_value(true)));
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}
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#[test]
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fn test_not() {
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assert_eq!(eval("!false"), Ok(to_value(true)));
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assert_eq!(eval("!true"), Ok(to_value(false)));
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assert_eq!(eval("!(1 != 2)"), Ok(to_value(false)));
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assert_eq!(eval("!(1 == 2)"), Ok(to_value(true)));
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assert_eq!(eval("!(1 == 2) == true"), Ok(to_value(true)));
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}
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#[test]
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fn test_not_and_brackets() {
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assert_eq!(eval("(!(1 == 2)) == true"), Ok(to_value(true)));
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}
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#[test]
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fn test_object_access() {
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let mut object = HashMap::new();
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object.insert("foo", "Foo, hello world!");
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object.insert("bar", "Bar, hello world!");
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assert_eq!(
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Expr::new("object.foo == 'Foo, hello world!'")
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.value("object", object)
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.exec(),
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Ok(to_value(true))
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);
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}
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#[test]
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fn test_object_dynamic_access() {
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let mut object = HashMap::new();
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object.insert("foo", "Foo, hello world!");
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object.insert("bar", "Bar, hello world!");
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assert_eq!(
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Expr::new("object['foo'] == 'Foo, hello world!'")
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.value("object", object)
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.exec(),
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Ok(to_value(true))
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);
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}
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#[test]
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fn test_object_dynamic_access_2() {
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let mut object = HashMap::new();
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object.insert("foo", "Foo, hello world!");
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object.insert("bar", "Bar, hello world!");
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assert_eq!(
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Expr::new("object[foo] == 'Foo, hello world!'")
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.value("object", object)
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.value("foo", "foo")
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.exec(),
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Ok(to_value(true))
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);
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}
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#[test]
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fn test_path() {
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assert_eq!(Expr::new("array[2-2].foo[2-2]").exec(), Ok(Value::Null));
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}
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#[test]
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fn test_array_access() {
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let array = vec!["hello", "world", "!"];
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assert_eq!(
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Expr::new(
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"array[1-1] == 'hello' && array[1] == 'world' && array[2] == '!'",
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).value("array", array)
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.exec(),
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Ok(to_value(true))
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);
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}
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#[test]
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fn test_builtin_is_empty() {
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assert_eq!(
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Expr::new("is_empty(array)")
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.value("array", Vec::<String>::new())
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.exec(),
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Ok(to_value(true))
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);
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}
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#[test]
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fn test_builtin_min() {
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assert_eq!(
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Expr::new("min(array)")
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.value("array", vec![23, 34, 45, 2])
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.exec(),
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Ok(to_value(2))
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);
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}
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#[test]
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fn test_custom_function() {
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assert_eq!(
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Expr::new("output()")
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.function(
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"output",
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|_| Ok(to_value("This is custom function's output")),
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)
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.exec(),
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|
Ok(to_value("This is custom function's output"))
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_error_start_with_non_value_operator() {
|
|
let mut tree = Tree {
|
|
raw: "+ + 5".to_owned(),
|
|
..Default::default()
|
|
};
|
|
|
|
tree.parse_pos().unwrap();
|
|
tree.parse_operators().unwrap();
|
|
|
|
assert_eq!(tree.parse_node(), Err(Error::StartWithNonValueOperator));
|
|
}
|
|
|
|
#[test]
|
|
fn test_error_duplicate_operator() {
|
|
let mut tree = Tree {
|
|
raw: "5 + + 5".to_owned(),
|
|
..Default::default()
|
|
};
|
|
|
|
tree.parse_pos().unwrap();
|
|
tree.parse_operators().unwrap();
|
|
|
|
assert_eq!(tree.parse_node(), Err(Error::DuplicateOperatorNode));
|
|
}
|
|
|
|
#[test]
|
|
fn test_error_duplicate_value() {
|
|
let mut tree = Tree {
|
|
raw: "2 + 6 5".to_owned(),
|
|
..Default::default()
|
|
};
|
|
|
|
tree.parse_pos().unwrap();
|
|
tree.parse_operators().unwrap();
|
|
|
|
assert_eq!(tree.parse_node(), Err(Error::DuplicateValueNode));
|
|
}
|
|
|
|
#[test]
|
|
fn test_error_unpaired_brackets() {
|
|
let mut tree = Tree {
|
|
raw: "(2 + 3)) * 5".to_owned(),
|
|
..Default::default()
|
|
};
|
|
|
|
tree.parse_pos().unwrap();
|
|
|
|
assert_eq!(tree.parse_operators(), Err(Error::UnpairedBrackets));
|
|
}
|
|
|
|
#[test]
|
|
fn test_error_comma() {
|
|
let mut tree = Tree {
|
|
raw: ", 2 + 5".to_owned(),
|
|
..Default::default()
|
|
};
|
|
|
|
tree.parse_pos().unwrap();
|
|
tree.parse_operators().unwrap();
|
|
|
|
assert_eq!(tree.parse_node(), Err(Error::CommaNotWithFunction));
|
|
}
|
|
|
|
#[test]
|
|
fn test_eval_issue_2() {
|
|
assert_eq!(eval("2 * (4 + 0) + 4"), Ok(to_value(12)));
|
|
assert_eq!(eval("2 * (2 + 2) + (1 + 3)"), Ok(to_value(12)));
|
|
assert_eq!(eval("2 * (4) + (4)"), Ok(to_value(12)));
|
|
}
|
|
}
|
|
|
|
#[cfg(all(feature = "unstable", test))]
|
|
mod benches {
|
|
extern crate test;
|
|
use eval;
|
|
use tree::Tree;
|
|
use Expr;
|
|
|
|
#[bench]
|
|
fn bench_deep_brackets(b: &mut test::Bencher) {
|
|
b.iter(|| eval("(2 + (3 + 4) + (6 + (6 + 7)) + 5)"));
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_parse_pos(b: &mut test::Bencher) {
|
|
let mut tree = Tree {
|
|
raw: "(2 + (3 + 4) + (6 + (6 + 7)) + 5)".to_owned(),
|
|
..Default::default()
|
|
};
|
|
|
|
b.iter(|| tree.parse_pos().unwrap());
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_parse_operators(b: &mut test::Bencher) {
|
|
let mut tree = Tree {
|
|
raw: "(2 + (3 + 4) + (6 + (6 + 7)) + 5)".to_owned(),
|
|
..Default::default()
|
|
};
|
|
|
|
tree.parse_pos().unwrap();
|
|
b.iter(|| tree.parse_operators().unwrap());
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_parse_nodes(b: &mut test::Bencher) {
|
|
let mut tree = Tree {
|
|
raw: "(2 + (3 + 4) + (6 + (6 + 7)) + 5)".to_owned(),
|
|
..Default::default()
|
|
};
|
|
|
|
tree.parse_pos().unwrap();
|
|
tree.parse_operators().unwrap();
|
|
b.iter(|| tree.parse_node().unwrap());
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_compile(b: &mut test::Bencher) {
|
|
b.iter(|| {
|
|
let mut tree = Tree {
|
|
raw: "(2 + (3 + 4) + (6 + (6 + 7)) + 5)".to_owned(),
|
|
..Default::default()
|
|
};
|
|
tree.parse_pos().unwrap();
|
|
tree.parse_operators().unwrap();
|
|
tree.parse_node().unwrap();
|
|
tree.compile().unwrap();
|
|
});
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_exec(b: &mut test::Bencher) {
|
|
let expr = Expr::new("(2 + (3 + 4) + (6 + (6 + 7)) + 5)")
|
|
.compile()
|
|
.unwrap();
|
|
b.iter(|| expr.exec().unwrap())
|
|
}
|
|
|
|
#[bench]
|
|
fn bench_eval(b: &mut test::Bencher) {
|
|
b.iter(|| eval("(2 + (3 + 4) + (6 + (6 + 7)) + 5)"));
|
|
}
|
|
}
|