70 lines
2.2 KiB
Rust
70 lines
2.2 KiB
Rust
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//! End-to-end pipeline tests: lexer -> parser -> resolver -> interpreter.
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//!
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//! These verify chapter-11 resolution wired into execution: a variable's
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//! resolved scope distance is used for lookup (`get_at`), and resolution errors
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//! abort before running.
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use rlox::backend::interpreter::{EvaluateInterpreter, Interpreter};
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use rlox::common::base_value::BaseValue;
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use rlox::frontend::lexer::Lexer;
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use rlox::frontend::parser::Parser;
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use rlox::middleend::variable_resolution::Resolver;
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/// Run the whole pipeline, returning the value of the last statement.
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fn run(src: &str) -> Result<BaseValue, String> {
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let tokens = Lexer::new(src.to_string(), 0)
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.scans_tokens()
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.map_err(|e| e.to_string())?;
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let ast = Parser::new(tokens).parse().map_err(|e| e.to_string())?;
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let locals = Resolver::resolve_program(&ast)
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.map_err(|errors| errors.into_iter().next().unwrap().to_string())?;
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let mut interpreter = Interpreter::new();
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interpreter.set_locals(locals);
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let mut last = BaseValue::Nil;
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for stmt in ast {
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last = interpreter.evaluate(stmt).map_err(|e| e.to_string())?;
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}
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Ok(last)
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}
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#[test]
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fn block_local_variables_evaluate() {
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assert_eq!(run("do x := 10; x + 5; end").unwrap().to_string(), "15");
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}
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#[test]
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fn resolved_nested_closure_reads_captured_local() {
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// `count` is read from inside a nested function, two scopes up; the
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// resolver records distance 2 and the interpreter uses `get_at(2, ..)`.
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let src = "\
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make :: fn () do
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count := 10;
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get :: fn () do
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return count;
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end
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return get;
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end
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g := make();
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g();
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";
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assert_eq!(run(src).unwrap().to_string(), "10");
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}
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#[test]
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fn use_before_initializer_is_rejected() {
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let err = run("do x := x; end").expect_err("should be a resolution error");
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assert!(err.contains("its own initializer"));
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}
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#[test]
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fn top_level_return_is_rejected() {
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let err = run("return 1;").expect_err("should be a resolution error");
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assert!(err.contains("top-level"));
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}
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#[test]
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fn duplicate_declaration_in_block_is_rejected() {
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let err = run("do x := 1; x := 2; end").expect_err("should be a resolution error");
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assert!(err.contains("Already a variable"));
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}
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