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New custom syntax expression types.

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This commit is contained in:
Stephen Chung
2021-06-10 10:16:39 +08:00
parent c3eb6d65f6
commit a5031969ca
7 changed files with 113 additions and 28 deletions
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23
tests/syntax.rs
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@@ -19,19 +19,24 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
engine.register_custom_syntax(
&[
"exec", "[", "$ident$", "]", "->", "$block$", "while", "$expr$",
"exec", "[", "$ident$", ";", "$int$", "]", "->", "$block$", "while", "$expr$",
],
true,
|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();
let max = inputs[1].get_literal_value().unwrap().as_int().unwrap();
let stmt = inputs.get(2).unwrap();
let condition = inputs.get(3).unwrap();
context.scope_mut().push(var_name.clone(), 0 as INT);
let mut count: INT = 0;
loop {
if count >= max {
break;
}
context.eval_expression_tree(stmt)?;
count += 1;
@@ -63,17 +68,17 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
engine.eval::<INT>(
"
let x = 0;
let foo = (exec [x] -> { x += 2 } while x < 42) * 10;
let foo = (exec [x;15] -> { x += 2 } while x < 42) * 10;
foo
"
)?,
210
150
);
assert_eq!(
engine.eval::<INT>(
"
let x = 0;
exec [x] -> { x += 1 } while x < 42;
exec [x;100] -> { x += 1 } while x < 42;
x
"
)?,
@@ -82,7 +87,7 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
assert_eq!(
engine.eval::<INT>(
"
exec [x] -> { x += 1 } while x < 42;
exec [x;100] -> { x += 1 } while x < 42;
x
"
)?,
@@ -92,11 +97,11 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
engine.eval::<INT>(
"
let foo = 123;
exec [x] -> { x += 1 } while x < 42;
exec [x;15] -> { x += 1 } while x < 42;
foo + x + x1 + x2 + x3
"
)?,
171
144
);
// The first symbol must be an identifier