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Put comments into example scripts.

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This commit is contained in:
Stephen Chung 2020-03-16 14:50:12 +08:00
parent 42ecae4366
commit d4311bddb0
17 changed files with 119 additions and 68 deletions
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46
README.md
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@ -50,8 +50,8 @@ Optional features
| `no_index` | Disable arrays and indexing features if not needed. |
| `no_float` | Disable floating-point numbers and math if not needed. |
| `no_optimize` | Disable the script optimizer. |
| `only_i32` | Set the system integer type to `i32` and disable all other integer types. |
| `only_i64` | Set the system integer type to `i64` and disable all other integer types. |
| `only_i32` | Set the system integer type to `i32` and disable all other integer types. `INT` is set to `i32`. |
| `only_i64` | Set the system integer type to `i64` and disable all other integer types. `INT` is set to `i64`. |
By default, Rhai includes all the standard functionalities in a small, tight package. Most features are here to opt-**out** of certain functionalities that are not needed.
Excluding unneeded functionalities can result in smaller, faster builds as well as less bugs due to a more restricted language.
@ -94,26 +94,26 @@ Example Scripts
There are also a number of examples scripts that showcase Rhai's features, all in the `scripts` folder:
| Language feature scripts | Description |
| ------------------------ | ------------------------------------------------------------- |
| `array.rhai` | arrays in Rhai |
| `assignment.rhai` | variable declarations |
| `comments.rhai` | just comments |
| `for1.rhai` | for loops |
| `function_decl1.rhai` | a function without parameters |
| `function_decl2.rhai` | a function with two parameters |
| `function_decl3.rhai` | a function with many parameters |
| `if1.rhai` | if example |
| `loop.rhai` | endless loop in Rhai, this example emulates a do..while cycle |
| `op1.rhai` | just a simple addition |
| `op2.rhai` | simple addition and multiplication |
| `op3.rhai` | change evaluation order with parenthesis |
| `string.rhai` | string operations |
| `while.rhai` | while loop |
| ---------------------------------------------------- | ------------------------------------------------------------- |
| [`array.rhai`](scripts/array.rhai) | arrays in Rhai |
| [`assignment.rhai`](scripts/assignment.rhai) | variable declarations |
| [`comments.rhai`](scripts/comments.rhai) | just comments |
| [`for1.rhai`](scripts/for1.rhai) | for loops |
| [`function_decl1.rhai`](scripts/function_decl1.rhai) | a function without parameters |
| [`function_decl2.rhai`](scripts/function_decl2.rhai) | a function with two parameters |
| [`function_decl3.rhai`](scripts/function_decl3.rhai) | a function with many parameters |
| [`if1.rhai`](scripts/if1.rhai) | if example |
| [`loop.rhai`](scripts/loop.rhai) | endless loop in Rhai, this example emulates a do..while cycle |
| [`op1.rhai`](scripts/op1.rhai) | just a simple addition |
| [`op2.rhai`](scripts/op2.rhai) | simple addition and multiplication |
| [`op3.rhai`](scripts/op3.rhai) | change evaluation order with parenthesis |
| [`string.rhai`](scripts/string.rhai) | string operations |
| [`while.rhai`](scripts/while.rhai) | while loop |
| Example scripts | Description |
| ----------------- | ---------------------------------------------------------------------------------- |
| `speed_test.rhai` | a simple program to measure the speed of Rhai's interpreter (1 million iterations) |
| `primes.rhai` | use Sieve of Eratosthenes to find all primes smaller than a limit |
| -------------------------------------------- | ---------------------------------------------------------------------------------- |
| [`speed_test.rhai`](scripts/speed_test.rhai) | a simple program to measure the speed of Rhai's interpreter (1 million iterations) |
| [`primes.rhai`](scripts/primes.rhai) | use Sieve of Eratosthenes to find all primes smaller than a limit |
To run the scripts, either make a tiny program or use of the `rhai_runner` example:
@ -740,7 +740,9 @@ The following standard functions (defined in the standard library but excluded i
Strings and Chars
-----------------
String and char literals follow C-style formatting, with support for Unicode ('`\u`') and hex ('`\x`') escape sequences.
String and char literals follow C-style formatting, with support for Unicode ('`\u`_xxxx_' or '`\U`_xxxxxxxx_') and hex ('`\x`_xx_') escape sequences.
Hex sequences map to ASCII characters, while '`\u`' maps to 16-bit common Unicode code points and '`\U`' maps the full, 32-bit extended Unicode code points.
Although internally Rhai strings are stored as UTF-8 just like in Rust (they _are_ Rust `String`s),
in the Rhai language they can be considered a stream of Unicode characters, and can be directly indexed (unlike Rust).
@ -1051,7 +1053,7 @@ for x in array {
if x == 42 { break; }
}
// The 'range' function allows iterating from first..last
// The 'range' function allows iterating from first to last-1
for x in range(0, 50) {
print(x);
if x == 42 { break; }

7
scripts/array.rhai
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@ -1,4 +1,7 @@
let x = [1, 2, 3];
print(x[1]);
print(x[1]); // prints 2
x[1] = 5;
print(x[1]);
print(x[1]); // prints 5

2
scripts/assignment.rhai
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@ -1,2 +1,2 @@
let x = 78;
print(x)
print(x);

6
scripts/comments.rhai
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@ -3,8 +3,8 @@
let /* I am a spy in a variable declaration! */ x = 5;
/* I am a simple
multiline comment */
multi-line comment */
/* look /* at /* that, /* multiline */ comments */ can be */ nested */
/* look /* at /* that, /* multi-line */ comments */ can be */ nested */
/* sorrounded by */ x // comments
/* surrounded by */ x // comments

28
scripts/for1.rhai
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@ -1,15 +1,17 @@
let arr = [1,2,3,4]
for a in arr {
for b in [10,20] {
print(a)
print(b)
}
if a == 3 {
break;
}
}
//print(a)
// This script runs for-loops
for i in range(0,5) {
print(i)
let arr = [1,2,3,4];
for a in arr {
for b in [10, 20] {
print(a + "," + b);
}
if a == 3 { break; }
}
//print(a); // <- if you uncomment this line, the script will fail to run
// because 'a' is not defined here
for i in range(0, 5) { // runs through a range from 1 to 5 exclusive
print(i);
}

6
scripts/function_decl1.rhai
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@ -1,5 +1,7 @@
// This script defines a function and calls it
fn bob() {
3
return 3;
}
print(bob())
print(bob()); // should print 3

11
scripts/function_decl2.rhai
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@ -1,5 +1,12 @@
// This script defines a function with two parameters
let a = 3;
fn addme(a, b) {
a+b
a = 42; // notice that 'a' is passed by value
a + b; // notice that the last value is returned even if terminated by a semicolon
}
print(addme(3, 4))
print(addme(a, 4)); // should print 46
print(a); // should print 3 - 'a' is never changed

4
scripts/function_decl3.rhai
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@ -1,5 +1,7 @@
// This script defines a function with many parameters and calls it
fn f(a, b, c, d, e, f) {
a - b * c - d * e - f
}
print(f(100, 5, 2, 9, 6, 32))
print(f(100, 5, 2, 9, 6, 32)); // should print 4

17
scripts/if1.rhai
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@ -1,5 +1,14 @@
let a = true;
if (a) {
let x = 56;
print(x);
let a = 42;
let b = 123;
let x = 999;
if a > b {
print("a > b");
} else if a < b {
print("a < b");
let x = 0; // this 'x' shadows the global 'x'
print(x); // should print 0
} else {
print("a == b");
}

4
scripts/loop.rhai
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@ -1,8 +1,12 @@
// This script runs an infinite loop, ending it with a break statement
let x = 10;
// simulate do..while using loop
loop {
print(x);
x = x - 1;
if x <= 0 { break; }
}

2
scripts/op1.rhai
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@ -1 +1 @@
print(34 + 12)
print(34 + 12); // should be 46

3
scripts/op2.rhai
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@ -1 +1,2 @@
print(12 + 34 * 5)
let x = 12 + 34 * 5;
print(x); // should be 182

3
scripts/op3.rhai
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@ -1 +1,2 @@
print(0 + (12 + 34) * 5)
let x = (12 + 34) * 5;
print(x); // should be 230

5
scripts/primes.rhai
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@ -1,6 +1,6 @@
// This is a script to calculate prime numbers.
// This script uses the Sieve of Eratosthenes to calculate prime numbers.
const MAX_NUMBER_TO_CHECK = 10000; // 1229 primes
const MAX_NUMBER_TO_CHECK = 10_000; // 1229 primes <= 10000
let prime_mask = [];
prime_mask.pad(MAX_NUMBER_TO_CHECK, true);
@ -24,4 +24,3 @@ for p in range(2, MAX_NUMBER_TO_CHECK) {
}
print("Total " + total_primes_found + " primes.");

11
scripts/speed_test.rhai
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@ -1,5 +1,12 @@
let x = 1000000;
// This script runs 1 million iterations
// to test the speed of the scripting engine.
let x = 1_000_000;
print("Ready... Go!");
while x > 0 {
x = x - 1;
}
print(x);
print("Finished.");

22
scripts/string.rhai
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@ -1,7 +1,17 @@
// This script tests string operations
print("hello");
print("this\nis \\ nice");
print("40 hex is \x40");
print("fun with unicode: \u2764 and \U0001F603");
print("foo" + " " + "bar");
print("foo" < "bar");
print("foo" >= "bar");
print("this\nis \\ nice"); // escape sequences
print("40 hex is \x40"); // hex escape sequence
print("unicode fun: \u2764"); // Unicode escape sequence
print("more fun: \U0001F603"); // Unicode escape sequence
print("foo" + " " + "bar"); // string building using strings
print("foo" < "bar"); // string comparison
print("foo" >= "bar"); // string comparison
print("the answer is " + 42); // string building using non-string types
let s = "hello, world!"; // string variable
print("length=" + s.len()); // should be 13
s[s.len()-1] = '?'; // change the string
print(s); // should print 'hello, world?'

2
scripts/while.rhai
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@ -1,3 +1,5 @@
// This script runs a while loop
let x = 10;
while x > 0 {