UT_StringArray.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        UT library (C++)
 *
 */

#ifndef __UT_StringArray_h__
#define __UT_StringArray_h__

#include "UT_API.h"
#include "UT_Array.h"
#include "UT_String.h"
#include "UT_StringHolder.h"
#include "UT_Swap.h"

#include <iosfwd>
#include <string>
#include <type_traits>


class UT_API UT_StringArray : public UT_Array<UT_StringHolder>
{
public:
    using               Parent = UT_Array<UT_StringHolder>;

    // Inherit constructors
    using               Parent::Parent;

                        UT_StringArray() {}
        
    explicit            UT_StringArray(const char **src);

    // Allow move/construction from parent type since we're just a wrapper
                        UT_StringArray(const Parent &src)
                            : Parent::UT_Array(src) {}

                        UT_StringArray(Parent &&src) noexcept
                            : Parent::UT_Array(std::move(src)) {}

    // Copy/move constructors are not inherited and need to be specified
                         UT_StringArray(UT_StringArray &&src) noexcept
                            = default;

                         UT_StringArray(const UT_StringArray &src) = default;

    UT_StringArray      &operator=(const UT_StringArray &src) = default;
    UT_StringArray      &operator=(UT_StringArray &&src) = default;

    UT_StringArray      &operator+=(const UT_StringArray &src);

    exint                remove(exint idx);

    exint                find(const UT_StringRef &str, exint s=0) const
                             { return UT_Array<UT_StringHolder>::find(
                                 UTmakeUnsafeRef(str), s); }

    exint                sortedFind(const UT_StringRef &str,
                                    Comparator compare) const
                            { return UT_Array<UT_StringHolder>::sortedFind(
                                 UTmakeUnsafeRef(str), compare); }

    void                 sort(bool forward, bool numbered);

    // We specialize the default case explicitly instead of using default
    // parameters or else someone calling the sort(Comparator) method 
    // can unexpectedly call the wrong sort function if given the wrong
    // comparison function pointer. This way, we can get a compiler error.
    void                 sort() { sort(true, true); }

    SYS_PRAGMA_PUSH_WARN()
    SYS_PRAGMA_DISABLE_DEPRECATED()

    // This method allows arbitrary sorting of the array.
    SYS_DEPRECATED_HDK_REPLACE(19.5, "Use ComparatorBool variant")
    void                 sort(Comparator compare)
                             { UT_Array<UT_StringHolder>::sort(compare); }

    SYS_PRAGMA_POP_WARN()

private:
    // SFINAE constraint for bool comparators to avoid ambiguity
    template <typename F>
    using IsBoolComp = decltype(std::declval<F>()(UT_StringHolder{},
                                                  UT_StringHolder{}), void());
public:

    /// Sort string array using custom comparator
    template <typename ComparatorBool,
              typename = IsBoolComp<ComparatorBool>>
    void                 sort(ComparatorBool is_less)
                            { UT_Array<UT_StringHolder>::sort(is_less); }

    exint                sortedInsert(const char *str,
                             bool forward = true,
                             bool numbered = true);

    template <typename Compare>
    void                 sortedInsert(const char *str, Compare is_less)
                         { 
                            UT_StringHolder entry(str);
                            UT_Array<UT_StringHolder>::sortedInsert(
                                entry, is_less);
                         }

    exint                sortedFind(const char *str,
                             bool forward = true,
                             bool numbered = true) const;

    exint                getLongestPrefixLength() const;

    // Join the string array elements together, using the passed string
    // as a separator between elements, and return the result.
    void                 join(const char *sep, UT_String &result) const;
    void                 join(const char *sep, UT_WorkBuffer &result) const;

    // Join the string array elements together, using the first passed string
    // as a separator between all elements except the last pair, in which case
    // the second separator string is used, and return the result.
    // (This can be used to create English join strings 'foo, bar and baz')
    void                 join(const char *sep, const char *sep_last,
                             UT_String &result) const;
    void                 join(const char *sep, const char *sep_last,
                             UT_WorkBuffer &result) const;

    // Compute a hash value from the hash for each string in the array.
    // The hash value is order-independent - that is {"Cf", "Of"} will hash
    // to the same value as {"Of", "Cf"}.
    unsigned             hash() const;

    template <typename I>
    class IndexedCompare
    {
    public:
        IndexedCompare(const UT_StringArray &values)
            : myValues(values)
        {}
        bool operator()(I a, I b) const
        { return ::strcmp(myValues(a), myValues(b)) < 0; }
    private:
        const UT_StringArray &myValues;
    };

    template <typename I>
    void        stableSortIndices(UT_Array<I> &indices) const
    {
        IndexedCompare<I> compare(*this);
        std::stable_sort(indices.getArray(),
                         indices.getArray() + indices.size(), compare);
    }
};

// For UT::ArraySet.
namespace UT
{
template <typename T>
struct DefaultClearer;

template <>
struct DefaultClearer<UT_StringArray>
{
    static void clear(UT_StringArray &v) { v.setCapacity(0); }
    static bool isClear(const UT_StringArray &v) { return v.capacity() == 0; }
    static void clearConstruct(UT_StringArray *p)
    {
        new ((void *)p) UT_StringArray();
    }
    static const bool clearNeedsDestruction = false;
};
}

#endif // __UT_StringArray_h__