z3/src/test/zstring.cpp

#include "util/debug.h"
#include "util/trace.h"
#include "util/zstring.h"
#include <iostream>

// Encode and check for roundtrip all printable ASCII characters.
static void tst_ascii_roundtrip() {
    unsigned ascii_min = 0x20; // ' '
    unsigned ascii_max = 0x7E; // '~'

    for (unsigned i = ascii_min; i <= ascii_max; ++i) {
        zstring input(i);
        std::string expected(1, i);
        bool roundtrip_ok = input.encode() == expected;

        if (!roundtrip_ok) {
            std::cout << "Failed to roundtrip printable ASCII char: " << expected
                      << "\n" << std::flush;
            ENSURE(roundtrip_ok);
        }
    }
}

// Test that control characters are properly escaped.
static void tst_control_chars_escaped() {
    // Test DEL character (0x7F / 127)
    zstring del_char(0x7Fu);
    std::string del_encoded = del_char.encode();
    bool del_ok = del_encoded == "\\u{7f}";
    
    if (!del_ok) {
        std::cout << "Failed to escape DEL character (0x7F): got '" << del_encoded 
                  << "', expected '\\u{7f}'\n" << std::flush;
        ENSURE(del_ok);
    }
    
    // Test a few other control characters below 0x20
    zstring null_char(0x00u);
    std::string null_encoded = null_char.encode();
    bool null_ok = null_encoded == "\\u{0}";
    
    if (!null_ok) {
        std::cout << "Failed to escape NULL character (0x00): got '" << null_encoded 
                  << "', expected '\\u{0}'\n" << std::flush;
        ENSURE(null_ok);
    }
    
    zstring tab_char(0x09u);
    std::string tab_encoded = tab_char.encode();
    bool tab_ok = tab_encoded == "\\u{9}";
    
    if (!tab_ok) {
        std::cout << "Failed to escape TAB character (0x09): got '" << tab_encoded 
                  << "', expected '\\u{9}'\n" << std::flush;
        ENSURE(tab_ok);
    }
}

void tst_zstring() {
    tst_ascii_roundtrip();
    tst_control_chars_escaped();
}