summaryrefslogtreecommitdiffstats
path: root/intl/icu/source/common/uvector.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /intl/icu/source/common/uvector.h
parentInitial commit. (diff)
downloadfirefox-esr-upstream.tar.xz
firefox-esr-upstream.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--intl/icu/source/common/uvector.h386
1 files changed, 386 insertions, 0 deletions
diff --git a/intl/icu/source/common/uvector.h b/intl/icu/source/common/uvector.h
new file mode 100644
index 0000000000..1b2a58da86
--- /dev/null
+++ b/intl/icu/source/common/uvector.h
@@ -0,0 +1,386 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+**********************************************************************
+* Copyright (C) 1999-2016, International Business Machines
+* Corporation and others. All Rights Reserved.
+**********************************************************************
+* Date Name Description
+* 10/22/99 alan Creation. This is an internal header.
+* It should not be exported.
+**********************************************************************
+*/
+
+#ifndef UVECTOR_H
+#define UVECTOR_H
+
+#include "unicode/utypes.h"
+#include "unicode/uobject.h"
+#include "cmemory.h"
+#include "uarrsort.h"
+#include "uelement.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ * Ultralightweight C++ implementation of a `void*` vector
+ * that is (mostly) compatible with java.util.Vector.
+ *
+ * This is a very simple implementation, written to satisfy an
+ * immediate porting need. As such, it is not completely fleshed out,
+ * and it aims for simplicity and conformity. Nonetheless, it serves
+ * its purpose (porting code from java that uses java.util.Vector)
+ * well, and it could be easily made into a more robust vector class.
+ *
+ * *Design notes*
+ *
+ * There is index bounds checking, but little is done about it. If
+ * indices are out of bounds, either nothing happens, or zero is
+ * returned. We *do* avoid indexing off into the weeds.
+ *
+ * Since we don't have garbage collection, UVector was given the
+ * option to *own* its contents. To employ this, set a deleter
+ * function. The deleter is called on a `void *` pointer when that
+ * pointer is released by the vector, either when the vector itself is
+ * destructed, or when a call to `setElementAt()` overwrites an element,
+ * or when a call to remove()` or one of its variants explicitly
+ * removes an element. If no deleter is set, or the deleter is set to
+ * zero, then it is assumed that the caller will delete elements as
+ * needed.
+ *
+ * *Error Handling* Functions that can fail, from out of memory conditions
+ * for example, include a UErrorCode parameter. Any function called
+ * with an error code already indicating a failure will not modify the
+ * vector in any way.
+ *
+ * For vectors that have a deleter function, any failure in inserting
+ * an element into the vector will instead delete the element that
+ * could not be adopted. This simplifies object ownership
+ * management around calls to `addElement()` and `insertElementAt()`;
+ * error or no, the function always takes ownership of an incoming object
+ * from the caller.
+ *
+ * In order to implement methods such as `contains()` and `indexOf()`,
+ * UVector needs a way to compare objects for equality. To do so, it
+ * uses a comparison function, or "comparer." If the comparer is not
+ * set, or is set to zero, then all such methods will act as if the
+ * vector contains no element. That is, indexOf() will always return
+ * -1, contains() will always return false, etc.
+ *
+ * <p><b>To do</b>
+ *
+ * <p>Improve the handling of index out of bounds errors.
+ *
+ * @author Alan Liu
+ */
+class U_COMMON_API UVector : public UObject {
+ // NOTE: UVector uses the UElement (union of void* and int32_t) as
+ // its basic storage type. It uses UElementsAreEqual as its
+ // comparison function. It uses UObjectDeleter as its deleter
+ // function. This allows sharing of support functions with UHashtable.
+
+private:
+ int32_t count = 0;
+
+ int32_t capacity = 0;
+
+ UElement* elements = nullptr;
+
+ UObjectDeleter *deleter = nullptr;
+
+ UElementsAreEqual *comparer = nullptr;
+
+public:
+ UVector(UErrorCode &status);
+
+ UVector(int32_t initialCapacity, UErrorCode &status);
+
+ UVector(UObjectDeleter *d, UElementsAreEqual *c, UErrorCode &status);
+
+ UVector(UObjectDeleter *d, UElementsAreEqual *c, int32_t initialCapacity, UErrorCode &status);
+
+ virtual ~UVector();
+
+ /**
+ * Assign this object to another (make this a copy of 'other').
+ * Use the 'assign' function to assign each element.
+ */
+ void assign(const UVector& other, UElementAssigner *assign, UErrorCode &ec);
+
+ /**
+ * Compare this vector with another. They will be considered
+ * equal if they are of the same size and all elements are equal,
+ * as compared using this object's comparer.
+ */
+ bool operator==(const UVector& other) const;
+
+ /**
+ * Equivalent to !operator==()
+ */
+ inline bool operator!=(const UVector& other) const {return !operator==(other);}
+
+ //------------------------------------------------------------
+ // java.util.Vector API
+ //------------------------------------------------------------
+
+ /**
+ * Add an element at the end of the vector.
+ * For use only with vectors that do not adopt their elements, which is to say,
+ * have not set an element deleter function. See `adoptElement()`.
+ */
+ void addElement(void *obj, UErrorCode &status);
+
+ /**
+ * Add an element at the end of the vector.
+ * For use only with vectors that adopt their elements, which is to say,
+ * have set an element deleter function. See `addElement()`.
+ *
+ * If the element cannot be successfully added, it will be deleted. This is
+ * normal ICU _adopt_ behavior - one way or another ownership of the incoming
+ * object is transferred from the caller.
+ *
+ * `addElement()` and `adoptElement()` are separate functions to make it easier
+ * to see what the function is doing at call sites. Having a single combined function,
+ * as in earlier versions of UVector, had proved to be error-prone.
+ */
+ void adoptElement(void *obj, UErrorCode &status);
+
+ void addElement(int32_t elem, UErrorCode &status);
+
+ void setElementAt(void* obj, int32_t index);
+
+ void setElementAt(int32_t elem, int32_t index);
+
+ void insertElementAt(void* obj, int32_t index, UErrorCode &status);
+
+ void insertElementAt(int32_t elem, int32_t index, UErrorCode &status);
+
+ void* elementAt(int32_t index) const;
+
+ int32_t elementAti(int32_t index) const;
+
+ UBool equals(const UVector &other) const;
+
+ inline void* firstElement() const {return elementAt(0);}
+
+ inline void* lastElement() const {return elementAt(count-1);}
+
+ inline int32_t lastElementi() const {return elementAti(count-1);}
+
+ int32_t indexOf(void* obj, int32_t startIndex = 0) const;
+
+ int32_t indexOf(int32_t obj, int32_t startIndex = 0) const;
+
+ inline UBool contains(void* obj) const {return indexOf(obj) >= 0;}
+
+ inline UBool contains(int32_t obj) const {return indexOf(obj) >= 0;}
+
+ UBool containsAll(const UVector& other) const;
+
+ UBool removeAll(const UVector& other);
+
+ UBool retainAll(const UVector& other);
+
+ void removeElementAt(int32_t index);
+
+ UBool removeElement(void* obj);
+
+ void removeAllElements();
+
+ inline int32_t size() const {return count;}
+
+ inline UBool isEmpty() const {return count == 0;}
+
+ UBool ensureCapacity(int32_t minimumCapacity, UErrorCode &status);
+
+ /**
+ * Change the size of this vector as follows: If newSize is
+ * smaller, then truncate the array, possibly deleting held
+ * elements for i >= newSize. If newSize is larger, grow the
+ * array, filling in new slots with nullptr.
+ */
+ void setSize(int32_t newSize, UErrorCode &status);
+
+ /**
+ * Fill in the given array with all elements of this vector.
+ */
+ void** toArray(void** result) const;
+
+ //------------------------------------------------------------
+ // New API
+ //------------------------------------------------------------
+
+ UObjectDeleter *setDeleter(UObjectDeleter *d);
+ bool hasDeleter() {return deleter != nullptr;}
+
+ UElementsAreEqual *setComparer(UElementsAreEqual *c);
+
+ inline void* operator[](int32_t index) const {return elementAt(index);}
+
+ /**
+ * Removes the element at the given index from this vector and
+ * transfer ownership of it to the caller. After this call, the
+ * caller owns the result and must delete it and the vector entry
+ * at 'index' is removed, shifting all subsequent entries back by
+ * one index and shortening the size of the vector by one. If the
+ * index is out of range or if there is no item at the given index
+ * then 0 is returned and the vector is unchanged.
+ */
+ void* orphanElementAt(int32_t index);
+
+ /**
+ * Returns true if this vector contains none of the elements
+ * of the given vector.
+ * @param other vector to be checked for containment
+ * @return true if the test condition is met
+ */
+ UBool containsNone(const UVector& other) const;
+
+ /**
+ * Insert the given object into this vector at its sorted position
+ * as defined by 'compare'. The current elements are assumed to
+ * be sorted already.
+ */
+ void sortedInsert(void* obj, UElementComparator *compare, UErrorCode& ec);
+
+ /**
+ * Insert the given integer into this vector at its sorted position
+ * as defined by 'compare'. The current elements are assumed to
+ * be sorted already.
+ */
+ void sortedInsert(int32_t obj, UElementComparator *compare, UErrorCode& ec);
+
+ /**
+ * Sort the contents of the vector, assuming that the contents of the
+ * vector are of type int32_t.
+ */
+ void sorti(UErrorCode &ec);
+
+ /**
+ * Sort the contents of this vector, using a caller-supplied function
+ * to do the comparisons. (It's confusing that
+ * UVector's UElementComparator function is different from the
+ * UComparator function type defined in uarrsort.h)
+ */
+ void sort(UElementComparator *compare, UErrorCode &ec);
+
+ /**
+ * Stable sort the contents of this vector using a caller-supplied function
+ * of type UComparator to do the comparison. Provides more flexibility
+ * than UVector::sort() because an additional user parameter can be passed to
+ * the comparison function.
+ */
+ void sortWithUComparator(UComparator *compare, const void *context, UErrorCode &ec);
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for this class.
+ */
+ static UClassID U_EXPORT2 getStaticClassID();
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for the actual class.
+ */
+ virtual UClassID getDynamicClassID() const override;
+
+private:
+ int32_t indexOf(UElement key, int32_t startIndex = 0, int8_t hint = 0) const;
+
+ void sortedInsert(UElement e, UElementComparator *compare, UErrorCode& ec);
+
+public:
+ // Disallow
+ UVector(const UVector&) = delete;
+
+ // Disallow
+ UVector& operator=(const UVector&) = delete;
+
+};
+
+
+/**
+ * Ultralightweight C++ implementation of a `void*` stack
+ * that is (mostly) compatible with java.util.Stack. As in java, this
+ * is merely a paper thin layer around UVector. See the UVector
+ * documentation for further information.
+ *
+ * *Design notes*
+ *
+ * The element at index `n-1` is (of course) the top of the
+ * stack.
+ *
+ * The poorly named `empty()` method doesn't empty the
+ * stack; it determines if the stack is empty.
+ *
+ * @author Alan Liu
+ */
+class U_COMMON_API UStack : public UVector {
+public:
+ UStack(UErrorCode &status);
+
+ UStack(int32_t initialCapacity, UErrorCode &status);
+
+ UStack(UObjectDeleter *d, UElementsAreEqual *c, UErrorCode &status);
+
+ UStack(UObjectDeleter *d, UElementsAreEqual *c, int32_t initialCapacity, UErrorCode &status);
+
+ virtual ~UStack();
+
+ // It's okay not to have a virtual destructor (in UVector)
+ // because UStack has no special cleanup to do.
+
+ inline UBool empty() const {return isEmpty();}
+
+ inline void* peek() const {return lastElement();}
+
+ inline int32_t peeki() const {return lastElementi();}
+
+ /**
+ * Pop and return an element from the stack.
+ * For stacks with a deleter function, the caller takes ownership
+ * of the popped element.
+ */
+ void* pop();
+
+ int32_t popi();
+
+ inline void* push(void* obj, UErrorCode &status) {
+ if (hasDeleter()) {
+ adoptElement(obj, status);
+ return (U_SUCCESS(status)) ? obj : nullptr;
+ } else {
+ addElement(obj, status);
+ return obj;
+ }
+ }
+
+ inline int32_t push(int32_t i, UErrorCode &status) {
+ addElement(i, status);
+ return i;
+ }
+
+ /*
+ If the object o occurs as an item in this stack,
+ this method returns the 1-based distance from the top of the stack.
+ */
+ int32_t search(void* obj) const;
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for this class.
+ */
+ static UClassID U_EXPORT2 getStaticClassID();
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for the actual class.
+ */
+ virtual UClassID getDynamicClassID() const override;
+
+ // Disallow
+ UStack(const UStack&) = delete;
+
+ // Disallow
+ UStack& operator=(const UStack&) = delete;
+};
+
+U_NAMESPACE_END
+
+#endif