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Implement variable resolver.

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This commit is contained in:
Stephen Chung
2020-10-11 21:58:11 +08:00
parent 9d93dac8e7
commit fd5a932611
18 changed files with 511 additions and 237 deletions
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23
tests/syntax.rs
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@@ -22,21 +22,28 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
"do", "|", "$ident$", "|", "->", "$block$", "while", "$expr$",
],
1,
|engine: &Engine, context: &mut EvalContext, scope: &mut Scope, inputs: &[Expression]| {
|scope: &mut Scope, context: &mut EvalContext, inputs: &[Expression]| {
let var_name = inputs[0].get_variable_name().unwrap().to_string();
let stmt = inputs.get(1).unwrap();
let expr = inputs.get(2).unwrap();
let condition = inputs.get(2).unwrap();
scope.push(var_name, 0 as INT);
loop {
engine.eval_expression_tree(context, scope, stmt)?;
context.eval_expression_tree(scope, stmt)?;
if !engine
.eval_expression_tree(context, scope, expr)?
let stop = !context
.eval_expression_tree(scope, condition)?
.as_bool()
.map_err(|err| engine.make_type_mismatch_err::<bool>(err, expr.position()))?
{
.map_err(|err| {
Box::new(EvalAltResult::ErrorMismatchDataType(
"bool".to_string(),
err.to_string(),
condition.position(),
))
})?;
if stop {
break;
}
}
@@ -61,7 +68,7 @@ fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
// The first symbol must be an identifier
assert_eq!(
*engine
.register_custom_syntax(&["!"], 0, |_, _, _, _| Ok(().into()))
.register_custom_syntax(&["!"], 0, |_, _, _| Ok(().into()))
.expect_err("should error")
.0,
ParseErrorType::BadInput("Improper symbol for custom syntax: '!'".to_string())