// Stdlib golden: String_IsEmpty / IsBlank / Repeat / ReplaceAll
import Std::Io::{PrintLine};
import Std::String::{
    String_IsEmpty, String_IsBlank, String_Repeat, String_ReplaceAll,
    String_Eq, String_Len, String_Contains, String_StartsWith, String_EndsWith
};
import Std::Test::{
    Test_AssertTrue, Test_AssertFalse, Test_AssertEqInt, Test_AssertEqString, Test_Pass
};

func Main() -> int {
    Test_AssertTrue(String_IsEmpty(""));
    Test_AssertFalse(String_IsEmpty("x"));
    Test_AssertTrue(String_IsBlank(""));
    Test_AssertTrue(String_IsBlank("   \t\n"));
    Test_AssertFalse(String_IsBlank(" x "));

    Test_AssertEqString(String_Repeat(".", 5), ".....");
    Test_AssertEqInt(String_Len(String_Repeat("ab", 3)) as int, 6);
    Test_AssertEqString(String_Repeat("x", 0), "");
    Test_AssertEqString(String_Repeat("ok", 1), "ok");

    let multi: String = String_ReplaceAll("a-b-a-b-a", "a", "X");
    Test_AssertEqString(multi, "X-b-X-b-X");
    let safe: String = String_ReplaceAll("..", ".", "x.");
    Test_AssertEqString(safe, "x.x.");

    Test_AssertTrue(String_Contains("hello", "ell"));
    Test_AssertTrue(String_StartsWith("hello", "he"));
    Test_AssertTrue(String_EndsWith("hello", "lo"));

    PrintLine("stdlib_string: ok");
    Test_Pass("stdlib_string");
    return 0;
}