kjuulh/rhai
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Refine docs and add custom syntax.

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This commit is contained in:
Stephen Chung
2020-07-10 22:01:47 +08:00
parent 7436fc1c05
commit ebffbf0f98
14 changed files with 391 additions and 51 deletions
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40
tests/syntax.rs
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@@ -7,9 +7,16 @@ use rhai::{
fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
// Disable 'while' and make sure it still works with custom syntax
engine.disable_symbol("while");
engine.consume("while false {}").expect_err("should error");
engine.consume("let while = 0")?;
engine
.add_custom_syntax(
&["do", "$ident$", "$block$", "while", "$expr$"],
.register_custom_syntax(
&[
"do", "|", "$ident$", "|", "->", "$block$", "while", "$expr$",
],
1,
|engine: &Engine,
scope: &mut Scope,
@@ -17,22 +24,19 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
state: &mut EvalState,
lib: &Module,
this_ptr: &mut Option<&mut Dynamic>,
exprs: &[Expr],
inputs: &[Expr],
level: usize| {
let var_name = match exprs.get(0).unwrap() {
Expr::Variable(s) => (s.0).0.clone(),
_ => unreachable!(),
};
let stmt = exprs.get(1).unwrap();
let expr = exprs.get(2).unwrap();
let var_name = inputs[0].get_variable_name().unwrap().to_string();
let stmt = inputs.get(1).unwrap();
let expr = inputs.get(2).unwrap();
scope.push(var_name, 0 as INT);
loop {
engine.eval_expr_from_ast(scope, mods, state, lib, this_ptr, stmt, level)?;
engine.eval_expression_tree(scope, mods, state, lib, this_ptr, stmt, level)?;
if !engine
.eval_expr_from_ast(scope, mods, state, lib, this_ptr, expr, level)?
.eval_expression_tree(scope, mods, state, lib, this_ptr, expr, level)?
.as_bool()
.map_err(|_| {
EvalAltResult::ErrorBooleanArgMismatch(
@@ -50,20 +54,24 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
)
.unwrap();
assert!(matches!(
*engine.add_custom_syntax(&["!"], 0, |_, _, _, _, _, _, _, _| Ok(().into())).expect_err("should error"),
LexError::ImproperSymbol(s) if s == "!"
));
// 'while' is now a custom keyword so this it can no longer be a variable
engine.consume("let while = 0").expect_err("should error");
assert_eq!(
engine.eval::<INT>(
r"
do x { x += 1 } while x < 42;
do |x| -> { x += 1 } while x < 42;
x
"
)?,
42
);
// The first symbol must be an identifier
assert!(matches!(
*engine.register_custom_syntax(&["!"], 0, |_, _, _, _, _, _, _, _| Ok(().into())).expect_err("should error"),
LexError::ImproperSymbol(s) if s == "!"
));
Ok(())
}