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Move built-in functions into separate module.

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This commit is contained in:
Stephen Chung 2020-03-01 17:37:47 +08:00
parent e93fd7d3fe
commit b152ed88f0
4 changed files with 345 additions and 307 deletions
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25
README.md
View File

@ -474,6 +474,7 @@ The following standard functions operate on arrays:
* `shift` - removes the first element and returns it (() if empty)
* `len` - returns the number of elements
* `pad` - pads the array with an element until a specified length
* `clear` - empties the array
* `truncate` - cuts off the array at exactly a specified length (discarding all subsequent elements)
```rust
@ -506,6 +507,10 @@ print(y.len()); // prints 10
y.truncate(5); // truncate the array to 5 elements
print(y.len()); // prints 5
y.clear(); // empty the array
print(y.len()); // prints 0
```
`push` and `pad` are only defined for standard built-in types. If you want to use them with
@ -574,24 +579,36 @@ The following standard functions operate on strings:
* `len` - returns the number of characters (not number of bytes) in the string
* `pad` - pads the string with an character until a specified number of characters
* `clear` - empties the string
* `truncate` - cuts off the string at exactly a specified number of characters
* `contains` - checks if a certain character or sub-string occurs in the string
* `replace` - replaces a substring with another
* `trim` - trims the string
```rust
let full_name == "Bob C. Davis";
let full_name == " Bob C. Davis ";
full_name.len() == 14;
full_name.trim();
full_name.len() == 12;
full_name.pad(15, '$');
full_name.len() = 15;
full_name.len() == 15;
full_name == "Bob C. Davis$$$";
full_name.truncate(6);
full_name.len() = 6;
full_name.len() == 6;
full_name == "Bob C.";
full_name.replace("Bob", "John");
full_name.len() = 7;
full_name.len() == 7;
full_name = "John C.";
full_name.contains('C') == true;
full_name.contains("John") == true;
full_name.clear();
full_name.len() == 0;
```
## Print and Debug

312
src/builtin.rs Normal file
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@ -0,0 +1,312 @@
use crate::{any::Any, Array, Dynamic, Engine, RegisterDynamicFn, RegisterFn};
use std::fmt::{Debug, Display};
use std::ops::{Add, BitAnd, BitOr, BitXor, Div, Mul, Neg, Rem, Shl, Shr, Sub};
macro_rules! reg_op {
($self:expr, $x:expr, $op:expr, $( $y:ty ),*) => (
$(
$self.register_fn($x, $op as fn(x: $y, y: $y)->$y);
)*
)
}
macro_rules! reg_un {
($self:expr, $x:expr, $op:expr, $( $y:ty ),*) => (
$(
$self.register_fn($x, $op as fn(x: $y)->$y);
)*
)
}
macro_rules! reg_cmp {
($self:expr, $x:expr, $op:expr, $( $y:ty ),*) => (
$(
$self.register_fn($x, $op as fn(x: $y, y: $y)->bool);
)*
)
}
macro_rules! reg_func1 {
($self:expr, $x:expr, $op:expr, $r:ty, $( $y:ty ),*) => (
$(
$self.register_fn($x, $op as fn(x: $y)->$r);
)*
)
}
macro_rules! reg_func2x {
($self:expr, $x:expr, $op:expr, $v:ty, $r:ty, $( $y:ty ),*) => (
$(
$self.register_fn($x, $op as fn(x: $v, y: $y)->$r);
)*
)
}
macro_rules! reg_func2y {
($self:expr, $x:expr, $op:expr, $v:ty, $r:ty, $( $y:ty ),*) => (
$(
$self.register_fn($x, $op as fn(y: $y, x: $v)->$r);
)*
)
}
macro_rules! reg_func3 {
($self:expr, $x:expr, $op:expr, $v:ty, $w:ty, $r:ty, $( $y:ty ),*) => (
$(
$self.register_fn($x, $op as fn(x: $v, y: $w, z: $y)->$r);
)*
)
}
impl Engine {
/// Register the built-in library.
pub(crate) fn register_builtins(&mut self) {
fn add<T: Add>(x: T, y: T) -> <T as Add>::Output {
x + y
}
fn sub<T: Sub>(x: T, y: T) -> <T as Sub>::Output {
x - y
}
fn mul<T: Mul>(x: T, y: T) -> <T as Mul>::Output {
x * y
}
fn div<T: Div>(x: T, y: T) -> <T as Div>::Output {
x / y
}
fn neg<T: Neg>(x: T) -> <T as Neg>::Output {
-x
}
fn lt<T: PartialOrd>(x: T, y: T) -> bool {
x < y
}
fn lte<T: PartialOrd>(x: T, y: T) -> bool {
x <= y
}
fn gt<T: PartialOrd>(x: T, y: T) -> bool {
x > y
}
fn gte<T: PartialOrd>(x: T, y: T) -> bool {
x >= y
}
fn eq<T: PartialEq>(x: T, y: T) -> bool {
x == y
}
fn ne<T: PartialEq>(x: T, y: T) -> bool {
x != y
}
fn and(x: bool, y: bool) -> bool {
x && y
}
fn or(x: bool, y: bool) -> bool {
x || y
}
fn not(x: bool) -> bool {
!x
}
fn concat(x: String, y: String) -> String {
x + &y
}
fn binary_and<T: BitAnd>(x: T, y: T) -> <T as BitAnd>::Output {
x & y
}
fn binary_or<T: BitOr>(x: T, y: T) -> <T as BitOr>::Output {
x | y
}
fn binary_xor<T: BitXor>(x: T, y: T) -> <T as BitXor>::Output {
x ^ y
}
fn left_shift<T: Shl<T>>(x: T, y: T) -> <T as Shl<T>>::Output {
x.shl(y)
}
fn right_shift<T: Shr<T>>(x: T, y: T) -> <T as Shr<T>>::Output {
x.shr(y)
}
fn modulo<T: Rem<T>>(x: T, y: T) -> <T as Rem<T>>::Output {
x % y
}
fn pow_i64_i64(x: i64, y: i64) -> i64 {
x.pow(y as u32)
}
fn pow_f64_f64(x: f64, y: f64) -> f64 {
x.powf(y)
}
fn pow_f64_i64(x: f64, y: i64) -> f64 {
x.powi(y as i32)
}
fn unit_eq(_a: (), _b: ()) -> bool {
true
}
reg_op!(self, "+", add, i32, i64, u32, u64, f32, f64);
reg_op!(self, "-", sub, i32, i64, u32, u64, f32, f64);
reg_op!(self, "*", mul, i32, i64, u32, u64, f32, f64);
reg_op!(self, "/", div, i32, i64, u32, u64, f32, f64);
reg_cmp!(self, "<", lt, i32, i64, u32, u64, String, char, f32, f64);
reg_cmp!(self, "<=", lte, i32, i64, u32, u64, String, char, f32, f64);
reg_cmp!(self, ">", gt, i32, i64, u32, u64, String, char, f32, f64);
reg_cmp!(self, ">=", gte, i32, i64, u32, u64, String, char, f32, f64);
reg_cmp!(self, "==", eq, i32, i64, u32, u64, bool, String, char, f32, f64);
reg_cmp!(self, "!=", ne, i32, i64, u32, u64, bool, String, char, f32, f64);
reg_op!(self, "||", or, bool);
reg_op!(self, "&&", and, bool);
reg_op!(self, "|", binary_or, i32, i64, u32, u64);
reg_op!(self, "|", or, bool);
reg_op!(self, "&", binary_and, i32, i64, u32, u64);
reg_op!(self, "&", and, bool);
reg_op!(self, "^", binary_xor, i32, i64, u32, u64);
reg_op!(self, "<<", left_shift, i32, i64, u32, u64);
reg_op!(self, ">>", right_shift, i32, i64, u32, u64);
reg_op!(self, "%", modulo, i32, i64, u32, u64);
self.register_fn("~", pow_i64_i64);
self.register_fn("~", pow_f64_f64);
self.register_fn("~", pow_f64_i64);
reg_un!(self, "-", neg, i32, i64, f32, f64);
reg_un!(self, "!", not, bool);
self.register_fn("+", concat);
self.register_fn("==", unit_eq);
// self.register_fn("[]", idx);
// FIXME? Registering array lookups are a special case because we want to return boxes
// directly let ent = self.fns.entry("[]".to_string()).or_insert_with(Vec::new);
// (*ent).push(FnType::ExternalFn2(Box::new(idx)));
// Register conversion functions
self.register_fn("to_float", |x: i32| x as f64);
self.register_fn("to_float", |x: u32| x as f64);
self.register_fn("to_float", |x: i64| x as f64);
self.register_fn("to_float", |x: u64| x as f64);
self.register_fn("to_float", |x: f32| x as f64);
self.register_fn("to_int", |x: i32| x as i64);
self.register_fn("to_int", |x: u32| x as i64);
self.register_fn("to_int", |x: u64| x as i64);
self.register_fn("to_int", |x: f32| x as i64);
self.register_fn("to_int", |x: f64| x as i64);
self.register_fn("to_int", |ch: char| ch as i64);
// Register print and debug
fn print_debug<T: Debug>(x: T) -> String {
format!("{:?}", x)
}
fn print<T: Display>(x: T) -> String {
format!("{}", x)
}
reg_func1!(self, "print", print, String, i32, i64, u32, u64);
reg_func1!(self, "print", print, String, f32, f64, bool, char, String);
reg_func1!(self, "print", print_debug, String, Array);
self.register_fn("print", |_: ()| println!());
reg_func1!(self, "debug", print_debug, String, i32, i64, u32, u64);
reg_func1!(self, "debug", print_debug, String, f32, f64, bool, char);
reg_func1!(self, "debug", print_debug, String, String, Array, ());
// Register array utility functions
fn push<T: Any>(list: &mut Array, item: T) {
list.push(Box::new(item));
}
fn pad<T: Any + Clone>(list: &mut Array, len: i64, item: T) {
if len >= 0 {
while list.len() < len as usize {
push(list, item.clone());
}
}
}
reg_func2x!(self, "push", push, &mut Array, (), i32, i64, u32, u64);
reg_func2x!(self, "push", push, &mut Array, (), f32, f64, bool, char);
reg_func2x!(self, "push", push, &mut Array, (), String, Array, ());
reg_func3!(self, "pad", pad, &mut Array, i64, (), i32, u32, f32);
reg_func3!(self, "pad", pad, &mut Array, i64, (), i64, u64, f64);
reg_func3!(self, "pad", pad, &mut Array, i64, (), bool, char);
reg_func3!(self, "pad", pad, &mut Array, i64, (), String, Array, ());
self.register_dynamic_fn("pop", |list: &mut Array| list.pop().unwrap_or(Box::new(())));
self.register_dynamic_fn("shift", |list: &mut Array| {
if list.len() > 0 {
list.remove(0)
} else {
Box::new(())
}
});
self.register_fn("len", |list: &mut Array| list.len() as i64);
self.register_fn("clear", |list: &mut Array| list.clear());
self.register_fn("truncate", |list: &mut Array, len: i64| {
if len >= 0 {
list.truncate(len as usize);
}
});
// Register string concatenate functions
fn prepend<T: Display>(x: T, y: String) -> String {
format!("{}{}", x, y)
}
fn append<T: Display>(x: String, y: T) -> String {
format!("{}{}", x, y)
}
reg_func2x!(self, "+", append, String, String, i32, i64, u32, u64, f32, f64, bool, char);
self.register_fn("+", |x: String, y: Array| format!("{}{:?}", x, y));
self.register_fn("+", |x: String, _: ()| format!("{}", x));
reg_func2y!(self, "+", prepend, String, String, i32, i64, u32, u64, f32, f64, bool, char);
self.register_fn("+", |x: Array, y: String| format!("{:?}{}", x, y));
self.register_fn("+", |_: (), y: String| format!("{}", y));
// Register string utility functions
self.register_fn("len", |s: &mut String| s.chars().count() as i64);
self.register_fn("contains", |s: &mut String, ch: char| s.contains(ch));
self.register_fn("contains", |s: &mut String, find: String| s.contains(&find));
self.register_fn("clear", |s: &mut String| s.clear());
self.register_fn("truncate", |s: &mut String, len: i64| {
if len >= 0 {
let chars: Vec<_> = s.chars().take(len as usize).collect();
s.clear();
chars.iter().for_each(|&ch| s.push(ch));
} else {
s.clear();
}
});
self.register_fn("pad", |s: &mut String, len: i64, ch: char| {
for _ in 0..s.chars().count() - len as usize {
s.push(ch);
}
});
self.register_fn("replace", |s: &mut String, find: String, sub: String| {
let new_str = s.replace(&find, &sub);
s.clear();
s.push_str(&new_str);
});
self.register_fn("trim", |s: &mut String| {
let trimmed = s.trim();
if trimmed.len() < s.len() {
let chars: Vec<_> = trimmed.chars().collect();
s.clear();
chars.iter().for_each(|&ch| s.push(ch));
}
});
// Register array iterator
self.register_iterator::<Array, _>(|a| {
Box::new(a.downcast_ref::<Array>().unwrap().clone().into_iter())
});
// Register range function
use std::ops::Range;
self.register_iterator::<Range<i64>, _>(|a| {
Box::new(
a.downcast_ref::<Range<i64>>()
.unwrap()
.clone()
.map(|n| Box::new(n) as Dynamic),
)
});
self.register_fn("range", |i1: i64, i2: i64| (i1..i2));
}
}

314
src/engine.rs
View File

@ -3,14 +3,13 @@ use std::cmp::{PartialEq, PartialOrd};
use std::collections::HashMap;
use std::error::Error;
use std::fmt;
use std::ops::{Add, BitAnd, BitOr, BitXor, Div, Mul, Neg, Rem, Shl, Shr, Sub};
use std::sync::Arc;
use crate::any::{Any, AnyExt, Dynamic, Variant};
use crate::call::FunArgs;
use crate::fn_register::{RegisterDynamicFn, RegisterFn};
use crate::fn_register::RegisterFn;
use crate::parser::{lex, parse, Expr, FnDef, ParseError, Stmt, AST};
use fmt::{Debug, Display};
use fmt::Debug;
pub type Array = Vec<Dynamic>;
pub type FnCallArgs<'a> = Vec<&'a mut Variant>;
@ -214,7 +213,7 @@ impl Engine {
/// Universal method for calling functions, that are either
/// registered with the `Engine` or written in Rhai
pub fn call_fn_raw(&self, ident: String, args: FnCallArgs) -> Result<Dynamic, EvalAltResult> {
fn call_fn_raw(&self, ident: String, args: FnCallArgs) -> Result<Dynamic, EvalAltResult> {
debug_println!(
"Trying to call function {:?} with args {:?}",
ident,
@ -286,7 +285,12 @@ impl Engine {
})
}
pub fn register_fn_raw(&mut self, ident: String, args: Option<Vec<TypeId>>, f: Box<FnAny>) {
pub(crate) fn register_fn_raw(
&mut self,
ident: String,
args: Option<Vec<TypeId>>,
f: Box<FnAny>,
) {
debug_println!("Register; {:?} with args {:?}", ident, args);
let spec = FnSpec { ident, args };
@ -501,7 +505,7 @@ impl Engine {
// Collect all the characters after the index
let mut chars: Vec<char> = s.chars().collect();
chars[idx] = new_ch;
s.truncate(0);
s.clear();
chars.iter().for_each(|&ch| s.push(ch));
}
@ -1008,302 +1012,6 @@ impl Engine {
}
}
/// Register the default library. That means, numeric types, char, bool
/// String, arithmetics and string concatenations.
pub fn register_default_lib(engine: &mut Engine) {
macro_rules! reg_op {
($engine:expr, $x:expr, $op:expr, $( $y:ty ),*) => (
$(
$engine.register_fn($x, $op as fn(x: $y, y: $y)->$y);
)*
)
}
macro_rules! reg_un {
($engine:expr, $x:expr, $op:expr, $( $y:ty ),*) => (
$(
$engine.register_fn($x, $op as fn(x: $y)->$y);
)*
)
}
macro_rules! reg_cmp {
($engine:expr, $x:expr, $op:expr, $( $y:ty ),*) => (
$(
$engine.register_fn($x, $op as fn(x: $y, y: $y)->bool);
)*
)
}
macro_rules! reg_func1 {
($engine:expr, $x:expr, $op:expr, $r:ty, $( $y:ty ),*) => (
$(
$engine.register_fn($x, $op as fn(x: $y)->$r);
)*
)
}
macro_rules! reg_func2x {
($engine:expr, $x:expr, $op:expr, $v:ty, $r:ty, $( $y:ty ),*) => (
$(
$engine.register_fn($x, $op as fn(x: $v, y: $y)->$r);
)*
)
}
macro_rules! reg_func2y {
($engine:expr, $x:expr, $op:expr, $v:ty, $r:ty, $( $y:ty ),*) => (
$(
$engine.register_fn($x, $op as fn(y: $y, x: $v)->$r);
)*
)
}
macro_rules! reg_func3 {
($engine:expr, $x:expr, $op:expr, $v:ty, $w:ty, $r:ty, $( $y:ty ),*) => (
$(
$engine.register_fn($x, $op as fn(x: $v, y: $w, z: $y)->$r);
)*
)
}
fn add<T: Add>(x: T, y: T) -> <T as Add>::Output {
x + y
}
fn sub<T: Sub>(x: T, y: T) -> <T as Sub>::Output {
x - y
}
fn mul<T: Mul>(x: T, y: T) -> <T as Mul>::Output {
x * y
}
fn div<T: Div>(x: T, y: T) -> <T as Div>::Output {
x / y
}
fn neg<T: Neg>(x: T) -> <T as Neg>::Output {
-x
}
fn lt<T: PartialOrd>(x: T, y: T) -> bool {
x < y
}
fn lte<T: PartialOrd>(x: T, y: T) -> bool {
x <= y
}
fn gt<T: PartialOrd>(x: T, y: T) -> bool {
x > y
}
fn gte<T: PartialOrd>(x: T, y: T) -> bool {
x >= y
}
fn eq<T: PartialEq>(x: T, y: T) -> bool {
x == y
}
fn ne<T: PartialEq>(x: T, y: T) -> bool {
x != y
}
fn and(x: bool, y: bool) -> bool {
x && y
}
fn or(x: bool, y: bool) -> bool {
x || y
}
fn not(x: bool) -> bool {
!x
}
fn concat(x: String, y: String) -> String {
x + &y
}
fn binary_and<T: BitAnd>(x: T, y: T) -> <T as BitAnd>::Output {
x & y
}
fn binary_or<T: BitOr>(x: T, y: T) -> <T as BitOr>::Output {
x | y
}
fn binary_xor<T: BitXor>(x: T, y: T) -> <T as BitXor>::Output {
x ^ y
}
fn left_shift<T: Shl<T>>(x: T, y: T) -> <T as Shl<T>>::Output {
x.shl(y)
}
fn right_shift<T: Shr<T>>(x: T, y: T) -> <T as Shr<T>>::Output {
x.shr(y)
}
fn modulo<T: Rem<T>>(x: T, y: T) -> <T as Rem<T>>::Output {
x % y
}
fn pow_i64_i64(x: i64, y: i64) -> i64 {
x.pow(y as u32)
}
fn pow_f64_f64(x: f64, y: f64) -> f64 {
x.powf(y)
}
fn pow_f64_i64(x: f64, y: i64) -> f64 {
x.powi(y as i32)
}
fn unit_eq(_a: (), _b: ()) -> bool {
true
}
reg_op!(engine, "+", add, i32, i64, u32, u64, f32, f64);
reg_op!(engine, "-", sub, i32, i64, u32, u64, f32, f64);
reg_op!(engine, "*", mul, i32, i64, u32, u64, f32, f64);
reg_op!(engine, "/", div, i32, i64, u32, u64, f32, f64);
reg_cmp!(engine, "<", lt, i32, i64, u32, u64, String, char, f32, f64);
reg_cmp!(engine, "<=", lte, i32, i64, u32, u64, String, char, f32, f64);
reg_cmp!(engine, ">", gt, i32, i64, u32, u64, String, char, f32, f64);
reg_cmp!(engine, ">=", gte, i32, i64, u32, u64, String, char, f32, f64);
reg_cmp!(engine, "==", eq, i32, i64, u32, u64, bool, String, char, f32, f64);
reg_cmp!(engine, "!=", ne, i32, i64, u32, u64, bool, String, char, f32, f64);
reg_op!(engine, "||", or, bool);
reg_op!(engine, "&&", and, bool);
reg_op!(engine, "|", binary_or, i32, i64, u32, u64);
reg_op!(engine, "|", or, bool);
reg_op!(engine, "&", binary_and, i32, i64, u32, u64);
reg_op!(engine, "&", and, bool);
reg_op!(engine, "^", binary_xor, i32, i64, u32, u64);
reg_op!(engine, "<<", left_shift, i32, i64, u32, u64);
reg_op!(engine, ">>", right_shift, i32, i64, u32, u64);
reg_op!(engine, "%", modulo, i32, i64, u32, u64);
engine.register_fn("~", pow_i64_i64);
engine.register_fn("~", pow_f64_f64);
engine.register_fn("~", pow_f64_i64);
reg_un!(engine, "-", neg, i32, i64, f32, f64);
reg_un!(engine, "!", not, bool);
engine.register_fn("+", concat);
engine.register_fn("==", unit_eq);
// engine.register_fn("[]", idx);
// FIXME? Registering array lookups are a special case because we want to return boxes
// directly let ent = engine.fns.entry("[]".to_string()).or_insert_with(Vec::new);
// (*ent).push(FnType::ExternalFn2(Box::new(idx)));
// Register conversion functions
engine.register_fn("to_float", |x: i32| x as f64);
engine.register_fn("to_float", |x: u32| x as f64);
engine.register_fn("to_float", |x: i64| x as f64);
engine.register_fn("to_float", |x: u64| x as f64);
engine.register_fn("to_float", |x: f32| x as f64);
engine.register_fn("to_int", |x: i32| x as i64);
engine.register_fn("to_int", |x: u32| x as i64);
engine.register_fn("to_int", |x: u64| x as i64);
engine.register_fn("to_int", |x: f32| x as i64);
engine.register_fn("to_int", |x: f64| x as i64);
engine.register_fn("to_int", |ch: char| ch as i64);
// Register print and debug
fn print_debug<T: Debug>(x: T) -> String {
format!("{:?}", x)
}
fn print<T: Display>(x: T) -> String {
format!("{}", x)
}
reg_func1!(engine, "print", print, String, i32, i64, u32, u64);
reg_func1!(engine, "print", print, String, f32, f64, bool, char, String);
reg_func1!(engine, "print", print_debug, String, Array);
engine.register_fn("print", |_: ()| println!());
reg_func1!(engine, "debug", print_debug, String, i32, i64, u32, u64);
reg_func1!(engine, "debug", print_debug, String, f32, f64, bool, char);
reg_func1!(engine, "debug", print_debug, String, String, Array, ());
// Register array utility functions
fn push<T: Any>(list: &mut Array, item: T) {
list.push(Box::new(item));
}
fn pad<T: Any + Clone>(list: &mut Array, len: i64, item: T) {
if len >= 0 {
while list.len() < len as usize {
push(list, item.clone());
}
}
}
reg_func2x!(engine, "push", push, &mut Array, (), i32, i64, u32, u64);
reg_func2x!(engine, "push", push, &mut Array, (), f32, f64, bool, char);
reg_func2x!(engine, "push", push, &mut Array, (), String, Array, ());
reg_func3!(engine, "pad", pad, &mut Array, i64, (), i32, u32, f32);
reg_func3!(engine, "pad", pad, &mut Array, i64, (), i64, u64, f64);
reg_func3!(engine, "pad", pad, &mut Array, i64, (), bool, char);
reg_func3!(engine, "pad", pad, &mut Array, i64, (), String, Array, ());
engine.register_dynamic_fn("pop", |list: &mut Array| list.pop().unwrap_or(Box::new(())));
engine.register_dynamic_fn("shift", |list: &mut Array| {
if list.len() > 0 {
list.remove(0)
} else {
Box::new(())
}
});
engine.register_fn("len", |list: &mut Array| -> i64 { list.len() as i64 });
engine.register_fn("truncate", |list: &mut Array, len: i64| {
if len >= 0 {
list.truncate(len as usize);
}
});
// Register string concatenate functions
fn prepend<T: Display>(x: T, y: String) -> String {
format!("{}{}", x, y)
}
fn append<T: Display>(x: String, y: T) -> String {
format!("{}{}", x, y)
}
reg_func2x!(engine, "+", append, String, String, i32, i64, u32, u64, f32, f64, bool, char);
engine.register_fn("+", |x: String, y: Array| format!("{}{:?}", x, y));
engine.register_fn("+", |x: String, _: ()| format!("{}", x));
reg_func2y!(engine, "+", prepend, String, String, i32, i64, u32, u64, f32, f64, bool, char);
engine.register_fn("+", |x: Array, y: String| format!("{:?}{}", x, y));
engine.register_fn("+", |_: (), y: String| format!("{}", y));
// Register string utility functions
engine.register_fn("len", |s: &mut String| -> i64 { s.chars().count() as i64 });
engine.register_fn("truncate", |s: &mut String, len: i64| {
if len >= 0 {
s.truncate(len as usize);
}
});
engine.register_fn("pad", |s: &mut String, len: i64, ch: char| {
let gap = s.chars().count() - len as usize;
for _ in 0..gap {
s.push(ch);
}
});
engine.register_fn(
"replace",
|s: &mut String, pattern: String, replace: String| {
let new_str = s.replace(&pattern, &replace);
s.truncate(0);
s.push_str(&new_str);
},
);
// Register array iterator
engine.register_iterator::<Array, _>(|a| {
Box::new(a.downcast_ref::<Array>().unwrap().clone().into_iter())
});
// Register range function
use std::ops::Range;
engine.register_iterator::<Range<i64>, _>(|a| {
Box::new(
a.downcast_ref::<Range<i64>>()
.unwrap()
.clone()
.map(|n| Box::new(n) as Dynamic),
)
});
engine.register_fn("range", |i1: i64, i2: i64| (i1..i2));
}
/// Make a new engine
pub fn new() -> Engine {
let mut engine = Engine {
@ -1313,7 +1021,7 @@ impl Engine {
on_debug: Box::new(|x: &str| println!("{}", x)),
};
Engine::register_default_lib(&mut engine);
engine.register_builtins();
engine
}

1
src/lib.rs
View File

@ -40,6 +40,7 @@ macro_rules! debug_println {
}
mod any;
mod builtin;
mod call;
mod engine;
mod fn_register;