// What:  Unit testing for lightweight, regular-expression pattern matcher
// Where: Published in Application Development Advisor, "Put to the Test"
// When:  November 2002 (updated February 2006)
// Who:   Kevlin Henney

#include "regex-lite.hpp"
#include <cassert>
#include <iostream>
#include <string>

int main()
{
    // test regex_match with pattern defined by a string literal
    const std::string text = "the cat sat on the mat";
    assert(regex_match(text.begin(), text.end(), "the"));
    assert(!regex_match(text.begin(), text.end(), "foo"));
    assert(regex_match(text.begin(), text.end(), "c.t"));
    assert(!regex_match(text.begin(), text.end(), "t.t"));
    assert(regex_match(text.begin(), text.end(), "^t"));
    assert(!regex_match(text.begin(), text.end(), "^c"));
    assert(regex_match(text.begin(), text.end(), "^t.*t"));
    assert(!regex_match(text.begin(), text.end(), "^t.*f"));
    assert(regex_match(text.begin(), text.end(), "t$"));
    assert(!regex_match(text.begin(), text.end(), "a$"));
    assert(regex_match(text.begin(), text.end(), "^t.*t$"));
    assert(!regex_match(text.begin(), text.end(), "^t.*f$"));
    assert(regex_match(text.begin(), text.end(), "t.*cat.*o"));
    assert(!regex_match(text.begin(), text.end(), "t.*rat.*o"));

    // test regex_match with pattern defined by an iterator range
    const std::string pattern = "s.*o";
    assert(regex_match(text.begin(), text.end(), pattern.begin(), pattern.end()));

    // test regex_match across embedded null character
    std::string next = "abcd";
    next += '\0';
    next += "efgh";
    assert(regex_match(next.begin(), next.end(), "fg"));
    assert(regex_match(next.begin(), next.end(), "d.e"));

    // test regex_match on empty ranges
    const std::string empty, non_empty = "cheshire cat";
    assert(regex_match(non_empty.begin(), non_empty.end(), ""));
    assert(regex_match(non_empty.begin(), non_empty.end(), empty.begin(), empty.end()));
    assert(!regex_match(empty.begin(), empty.end(), non_empty.begin(), non_empty.end()));

    // test regex_match with wide-character strings (optional)
    #ifndef INCOMPLETE_WCHAR_SUPPORT
    const std::wstring wtext = L"the cat sat on the mat";
    assert(regex_match(wtext.begin(), wtext.end(), L"^t.*t$"));
    assert(!regex_match(wtext.begin(), wtext.end(), L"^t.*f$"));
    assert(regex_match(wtext.begin(), wtext.end(), "t.*cat.*o"));
    assert(!regex_match(wtext.begin(), wtext.end(), "t.*rat.*o"));
    #endif

    std::cout << "Tests completed OK" << std::endl;
    return 0;
}