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Add raw API for custom syntax.

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This commit is contained in:
Stephen Chung
2020-10-25 21:57:18 +08:00
parent f670d55871
commit b607a3a9ba
11 changed files with 298 additions and 176 deletions
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51
tests/syntax.rs
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@@ -1,4 +1,4 @@
use rhai::{Engine, EvalAltResult, EvalContext, Expression, ParseErrorType, INT};
use rhai::{Engine, EvalAltResult, ParseError, ParseErrorType, Position, INT};
#[test]
fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
@@ -19,10 +19,10 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
engine.register_custom_syntax(
&[
"do", "|", "$ident$", "|", "->", "$block$", "while", "$expr$",
"exec", "|", "$ident$", "|", "->", "$block$", "while", "$expr$",
],
1,
|context: &mut EvalContext, inputs: &[Expression]| {
|context, inputs| {
let var_name = inputs[0].get_variable_name().unwrap().to_string();
let stmt = inputs.get(1).unwrap();
let condition = inputs.get(2).unwrap();
@@ -58,7 +58,7 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
assert_eq!(
engine.eval::<INT>(
r"
do |x| -> { x += 1 } while x < 42;
exec |x| -> { x += 1 } while x < 42;
x
"
)?,
@@ -71,7 +71,48 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
.register_custom_syntax(&["!"], 0, |_, _| Ok(().into()))
.expect_err("should error")
.0,
ParseErrorType::BadInput("Improper symbol for custom syntax: '!'".to_string())
ParseErrorType::BadInput(
"Improper symbol for custom syntax at position #1: '!'".to_string()
)
);
Ok(())
}
#[test]
fn test_custom_syntax_raw() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
engine.register_custom_syntax_raw(
"hello",
|stream| match stream.len() {
0 => unreachable!(),
1 => Ok(Some("$ident$".into())),
2 => match stream[1].as_str() {
"world" | "kitty" => Ok(None),
s => Err(ParseError(
Box::new(ParseErrorType::BadInput(s.to_string())),
Position::none(),
)),
},
_ => unreachable!(),
},
0,
|_, inputs| {
Ok(match inputs[0].get_variable_name().unwrap() {
"world" => 123 as INT,
"kitty" => 42 as INT,
_ => unreachable!(),
}
.into())
},
);
assert_eq!(engine.eval::<INT>("hello world")?, 123);
assert_eq!(engine.eval::<INT>("hello kitty")?, 42);
assert_eq!(
*engine.compile("hello hey").expect_err("should error").0,
ParseErrorType::BadInput("hey".to_string())
);
Ok(())