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fix: 字符串关系比较统一按 UTF-16 码元序

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彭俊皓
2026-09-17 17:54:29 +00:00
parent 133542d439
commit eb2fb00249
2 changed files with 39 additions and 4 deletions
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crates/oxide_vm/tests/comparison_tests.rs
+33
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@@ -124,3 +124,36 @@ fn eval_unary_plus_nan() {
fn eval_unary_plus_false() {
assert_eq!(eval("+false"), "0");
}
#[test]
fn eval_string_relational_utf16_code_unit_order() {
// 字符串关系比较按 UTF-16 码元序：补充平面字符（首码元 D800..DBFF）小于
// U+E000..U+FFFF 的 BMP 字符。覆盖双 Flat、单侧 rope、ASCII 与等值边界。
let cases = [
// 超平面 vs BMP 高区，四运算符双向。
(r#""\u{10000}" < "\uFFFF""#, "true"),
(r#""\u{10000}" > "\uFFFF""#, "false"),
(r#""\u{10000}" <= "\uFFFF""#, "true"),
(r#""\u{10000}" >= "\uFFFF""#, "false"),
(r#""\uFFFF" < "\u{10000}""#, "false"),
(r#""\u{10000}" < "\uE000""#, "true"),
(r#""\uE000" < "\u{10000}""#, "false"),
// 等值边界：代理对写法与转义写法内容相同。
(r#""\u{10000}" < "\u{10000}""#, "false"),
(r#""\u{10000}" <= "\u{10000}""#, "true"),
(r#""\u{10000}" >= "\uD800\uDC00""#, "true"),
// 单侧非 Flat：左侧 rope 首码元为 D800，兜底单元通道结果与双 Flat 一致。
(r#""\u{10000}" + "a".repeat(200) < "\uFFFF""#, "true"),
(r#""\uFFFF" < "\u{10000}" + "a".repeat(200)"#, "false"),
// ASCII 与公共前缀：字节序与码元序一致。
(r#""a" < "b""#, "true"),
(r#""abc" < "abd""#, "true"),
(r#""abc" < "abc""#, "false"),
(r#""abc" <= "abc""#, "true"),
(r#""b" > "a""#, "true"),
("\"\" < \"a\"", "true"),
];
for (source, expected) in cases {
assert_eq!(eval(source), expected, "source: {source}");
}
}