354 lines
10 KiB
Rust
354 lines
10 KiB
Rust
#![cfg(not(feature = "no_custom_syntax"))]
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use rhai::{
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Dynamic, Engine, EvalAltResult, ImmutableString, LexError, ParseErrorType, Position, Scope, INT,
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};
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#[test]
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fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
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let mut engine = Engine::new();
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engine.run("while false {}")?;
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// Disable 'while' and make sure it still works with custom syntax
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engine.disable_symbol("while");
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assert!(matches!(
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engine.compile("while false {}").expect_err("should error").err_type(),
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ParseErrorType::Reserved(err) if err == "while"
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));
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assert!(matches!(
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engine.compile("let while = 0").expect_err("should error").err_type(),
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ParseErrorType::Reserved(err) if err == "while"
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));
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// Implement ternary operator
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engine.register_custom_syntax(
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["iff", "$expr$", "?", "$expr$", ":", "$expr$"],
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false,
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|context, inputs| match context.eval_expression_tree(&inputs[0])?.as_bool() {
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Ok(true) => context.eval_expression_tree(&inputs[1]),
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Ok(false) => context.eval_expression_tree(&inputs[2]),
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Err(typ) => Err(Box::new(EvalAltResult::ErrorMismatchDataType(
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"bool".to_string(),
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typ.to_string(),
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inputs[0].position(),
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))),
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},
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)?;
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assert_eq!(
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engine.eval::<INT>(
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"
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let x = 42;
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let y = iff x > 40 ? 0 : 123;
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y
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"
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)?,
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0
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);
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assert_eq!(
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engine.eval::<INT>(
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"
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let x = 42;
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let y = iff x == 0 ? 0 : 123;
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y
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"
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)?,
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123
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);
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// Custom syntax
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engine.register_custom_syntax(
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[
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"exec", "[", "$ident$", "$symbol$", "$int$", "]", "->", "$block$", "while", "$expr$",
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],
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true,
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|context, inputs| {
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let var_name = inputs[0].get_string_value().unwrap();
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let op = inputs[1].get_literal_value::<ImmutableString>().unwrap();
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let max = inputs[2].get_literal_value::<INT>().unwrap();
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let stmt = &inputs[3];
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let condition = &inputs[4];
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context.scope_mut().push(var_name.to_string(), 0 as INT);
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let mut count: INT = 0;
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loop {
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let done = match op.as_str() {
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"<" => count >= max,
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"<=" => count > max,
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">" => count <= max,
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">=" => count < max,
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"==" => count != max,
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"!=" => count == max,
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_ => return Err(format!("Unsupported operator: {op}").into()),
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};
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if done {
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break;
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}
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// Do not rewind if the variable is upper-case
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if var_name.to_uppercase() == var_name {
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context.eval_expression_tree_raw(stmt, false)?;
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} else {
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context.eval_expression_tree(stmt)?;
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}
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count += 1;
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context
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.scope_mut()
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.push(format!("{var_name}{count}"), count);
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let stop = !context
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.eval_expression_tree(condition)?
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.as_bool()
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.map_err(|err| {
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Box::new(EvalAltResult::ErrorMismatchDataType(
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"bool".to_string(),
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err.to_string(),
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condition.position(),
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))
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})?;
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if stop {
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break;
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}
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}
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Ok(count.into())
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},
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)?;
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assert!(matches!(
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*engine
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.run("let foo = (exec [x<<15] -> { x += 2 } while x < 42) * 10;")
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.expect_err("should error"),
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EvalAltResult::ErrorRuntime(..)
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));
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assert_eq!(
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engine.eval::<INT>(
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"
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let x = 0;
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let foo = (exec [x<15] -> { x += 2 } while x < 42) * 10;
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foo
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"
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)?,
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150
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);
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assert_eq!(
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engine.eval::<INT>(
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"
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let x = 0;
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exec [x<100] -> { x += 1 } while x < 42;
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x
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"
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)?,
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42
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);
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assert_eq!(
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engine.eval::<INT>(
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"
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exec [x<100] -> { x += 1 } while x < 42;
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x
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"
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)?,
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42
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);
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assert_eq!(
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engine.eval::<INT>(
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"
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let foo = 123;
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exec [x<15] -> { x += 1 } while x < 42;
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foo + x + x1 + x2 + x3
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"
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)?,
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144
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);
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assert_eq!(
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engine.eval::<INT>(
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"
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let foo = 123;
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exec [x<15] -> { let foo = x; x += 1; } while x < 42;
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foo
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"
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)?,
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123
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);
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assert_eq!(
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engine.eval::<INT>(
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"
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let foo = 123;
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exec [ABC<15] -> { let foo = ABC; ABC += 1; } while ABC < 42;
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foo
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"
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)?,
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14
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);
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// The first symbol must be an identifier
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assert_eq!(
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*engine
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.register_custom_syntax(["!"], false, |_, _| Ok(Dynamic::UNIT))
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.expect_err("should error")
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.err_type(),
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ParseErrorType::BadInput(LexError::ImproperSymbol(
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"!".to_string(),
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"Improper symbol for custom syntax at position #1: '!'".to_string()
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))
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);
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// Check self-termination
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engine
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.register_custom_syntax(["test1", "$block$"], true, |_, _| Ok(Dynamic::UNIT))?
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.register_custom_syntax(["test2", "}"], true, |_, _| Ok(Dynamic::UNIT))?
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.register_custom_syntax(["test3", ";"], true, |_, _| Ok(Dynamic::UNIT))?;
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assert_eq!(engine.eval::<INT>("test1 { x = y + z; } 42")?, 42);
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assert_eq!(engine.eval::<INT>("test2 } 42")?, 42);
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assert_eq!(engine.eval::<INT>("test3; 42")?, 42);
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// Register the custom syntax: var x = ???
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engine.register_custom_syntax(
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["var", "$ident$", "=", "$expr$"],
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true,
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|context, inputs| {
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let var_name = inputs[0].get_string_value().unwrap();
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let expr = &inputs[1];
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// Evaluate the expression
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let value = context.eval_expression_tree(expr)?;
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if !context.scope().is_constant(var_name).unwrap_or(false) {
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context.scope_mut().set_value(var_name.to_string(), value);
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Ok(Dynamic::UNIT)
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} else {
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Err(format!("variable {var_name} is constant").into())
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}
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},
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)?;
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let mut scope = Scope::new();
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assert_eq!(
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engine.eval_with_scope::<INT>(&mut scope, "var foo = 42; foo")?,
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42
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);
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assert_eq!(scope.get_value::<INT>("foo"), Some(42));
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assert_eq!(scope.len(), 1);
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assert_eq!(
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engine.eval_with_scope::<INT>(&mut scope, "var foo = 123; foo")?,
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123
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);
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assert_eq!(scope.get_value::<INT>("foo"), Some(123));
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assert_eq!(scope.len(), 1);
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Ok(())
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}
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#[test]
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fn test_custom_syntax_raw() -> Result<(), Box<EvalAltResult>> {
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let mut engine = Engine::new();
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engine.register_custom_syntax_with_state_raw(
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"hello",
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|stream, look_ahead, state| match stream.len() {
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0 => unreachable!(),
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1 if look_ahead == "\"world\"" => {
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*state = Dynamic::TRUE;
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Ok(Some("$string$".into()))
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}
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1 => {
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*state = Dynamic::FALSE;
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Ok(Some("$ident$".into()))
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}
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2 => {
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match stream[1].as_str() {
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"world" if state.as_bool().unwrap_or(false) => Ok(Some("$$world".into())),
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"world" => Ok(Some("$$hello".into())),
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"kitty" => {
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*state = (42 as INT).into();
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Ok(None)
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}
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s => Err(LexError::ImproperSymbol(s.to_string(), String::new())
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.into_err(Position::NONE)),
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}
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}
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_ => unreachable!(),
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},
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true,
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|context, inputs, state| {
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context.scope_mut().push("foo", 999 as INT);
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Ok(match inputs[0].get_string_value().unwrap() {
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"world" => match inputs.last().unwrap().get_string_value().unwrap_or("") {
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"$$hello" => 0 as INT,
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"$$world" => 123456 as INT,
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_ => 123 as INT,
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},
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"kitty" if inputs.len() > 1 => 999 as INT,
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"kitty" => state.as_int().unwrap(),
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_ => unreachable!(),
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}
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.into())
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},
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);
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assert_eq!(engine.eval::<INT>(r#"hello "world""#)?, 123456);
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assert_eq!(engine.eval::<INT>("hello world")?, 0);
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assert_eq!(engine.eval::<INT>("hello kitty")?, 42);
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assert_eq!(
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engine.eval::<INT>("let foo = 0; (hello kitty) + foo")?,
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1041
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);
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assert_eq!(engine.eval::<INT>("(hello kitty) + foo")?, 1041);
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assert_eq!(
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*engine
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.compile("hello hey")
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.expect_err("should error")
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.err_type(),
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ParseErrorType::BadInput(LexError::ImproperSymbol("hey".to_string(), String::new()))
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);
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Ok(())
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}
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#[test]
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fn test_custom_syntax_raw2() -> Result<(), Box<EvalAltResult>> {
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let mut engine = Engine::new();
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engine.register_custom_syntax_with_state_raw(
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"#",
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|symbols, lookahead, _| match symbols.len() {
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1 if lookahead == "-" => Ok(Some("$symbol$".into())),
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1 => Ok(Some("$int$".into())),
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2 if symbols[1] == "-" => Ok(Some("$int$".into())),
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2 => Ok(None),
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3 => Ok(None),
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_ => unreachable!(),
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},
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false,
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move |_, inputs, _| {
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let id = if inputs.len() == 2 {
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-inputs[1].get_literal_value::<INT>().unwrap()
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} else {
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inputs[0].get_literal_value::<INT>().unwrap()
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};
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Ok(id.into())
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},
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);
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assert_eq!(engine.eval::<INT>("#-1")?, -1);
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assert_eq!(engine.eval::<INT>("let x = 41; x + #1")?, 42);
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#[cfg(not(feature = "no_object"))]
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assert_eq!(engine.eval::<INT>("#-42.abs()")?, 42);
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assert_eq!(engine.eval::<INT>("#42/2")?, 21);
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assert_eq!(engine.eval::<INT>("sign(#1)")?, 1);
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Ok(())
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}
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