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Make API chainable.

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This commit is contained in:
Stephen Chung
2020-07-12 11:46:53 +08:00
parent 2a8d63fd5f
commit 8449f8c55e
22 changed files with 223 additions and 143 deletions
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18
doc/src/engine/custom-op.md
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@@ -17,12 +17,12 @@ use rhai::{Engine, RegisterFn};
let mut engine = Engine::new();
// Register a custom operator called 'foo' and give it
// a precedence of 160 (i.e. between +|- and *|/)
engine.register_custom_operator("foo", 160).unwrap();
// Register the implementation of the customer operator as a function
engine.register_fn("foo", |x: i64, y: i64| (x * y) - (x + y));
// Register a custom operator named 'foo' and give it a precedence of 160
// (i.e. between +|- and *|/)
// Also register the implementation of the customer operator as a function
engine
.register_custom_operator("foo", 160).unwrap()
.register_fn("foo", |x: i64, y: i64| (x * y) - (x + y));
// The custom operator can be used in expressions
let result = engine.eval_expression::<i64>("1 + 2 * 3 foo 4 - 5 / 6")?;
@@ -71,9 +71,9 @@ All custom operators must be _binary_ (i.e. they take two operands).
_Unary_ custom operators are not supported.
```rust
engine.register_custom_operator("foo", 160).unwrap();
engine.register_fn("foo", |x: i64| x * x);
engine
.register_custom_operator("foo", 160).unwrap()
.register_fn("foo", |x: i64| x * x);
engine.eval::<i64>("1 + 2 * 3 foo 4 - 5 / 6")?; // error: function 'foo (i64, i64)' not found
```

5
doc/src/engine/disable.md
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@@ -13,8 +13,9 @@ use rhai::Engine;
let mut engine = Engine::new();
engine.disable_symbol("if"); // disable the 'if' keyword
engine.disable_symbol("+="); // disable the '+=' operator
engine
.disable_symbol("if") // disable the 'if' keyword
.disable_symbol("+="); // disable the '+=' operator
// The following all return parse errors.