luau-syntax 0.732.0

Luau lexer, parser, AST, CST, and source utilities
Documentation 
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use super::*;

// Parser.test.cpp: parse_error_function_call
#[test]
fn parse_error_function_call() {
    let errors = parse_errors(
        r#"
function stringifyTable(t)
    local foo = t:Parse 2
    return foo
end
        "#,
    );

    assert_eq!(errors[0].location.begin.line, 2);
    assert_eq!(
        errors[0].message,
        "Expected '(', '{' or <string> when parsing function call, got '2'"
    );
}

// Parser.test.cpp: parse_error_function_call_newline
#[test]
fn parse_error_function_call_newline() {
    let errors = parse_errors(
        r#"
function stringifyTable(t)
    local foo = t:Parse
    return foo
end
        "#,
    );

    assert_eq!(errors[0].location.begin.line, 2);
    assert_eq!(
        errors[0].message,
        "Expected function call arguments after '('"
    );
}
// Parser.test.cpp: parse_error_confusing_function_call
#[test]
fn parse_error_confusing_function_call() {
    for source in [
        r#"
function add(x, y) return x + y end
add
(4, 7)
"#,
        r#"
function add(x, y) return x + y end
local f = add
(f :: any)['x'] = 2
"#,
        r#"
local x = {}
function x:add(a, b) return a + b end
x:add
(1, 2)
"#,
        r#"
local t = {}
function f() return t end
t.x, (f)
().y = 5, 6
"#,
    ] {
        let errors = parse_errors(source);
        assert_eq!(errors.len(), 1);
        errors.assert_first_message(
            "Ambiguous syntax: this looks like an argument list for a function call, but could also be a start of new statement; use ';' to separate statements",
        );
    }
}

// Parser.test.cpp: get_a_nice_error_when_there_is_an_extra_comma_at_the_end_of_a_function_argument_list
#[test]
fn get_a_nice_error_when_there_is_an_extra_comma_at_the_end_of_a_function_argument_list() {
    let errors = parse_errors(
        r#"
        foo(a, b, c,)
    "#,
    );
    assert_eq!(errors.len(), 1);
    assert_eq!(errors[0].location, loc!(pos!(1, 20), pos!(1, 21)));
    assert_eq!(
        errors[0].message,
        "Expected expression after ',' but got ')' instead"
    );
}