271 lines
8.6 KiB
C++
271 lines
8.6 KiB
C++
// © 2017 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#ifndef __NUMBER_STRINGBUILDER_H__
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#define __NUMBER_STRINGBUILDER_H__
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#include <cstdint>
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#include <type_traits>
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#include "cstring.h"
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#include "uassert.h"
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#include "fphdlimp.h"
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U_NAMESPACE_BEGIN
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class FormattedValueStringBuilderImpl;
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/**
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* A StringBuilder optimized for formatting. It implements the following key
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* features beyond a UnicodeString:
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*
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* <ol>
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* <li>Efficient prepend as well as append.
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* <li>Keeps track of Fields in an efficient manner.
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* </ol>
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*
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* See also FormattedValueStringBuilderImpl.
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*
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* @author sffc (Shane Carr)
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*/
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class U_I18N_API FormattedStringBuilder : public UMemory {
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private:
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static const int32_t DEFAULT_CAPACITY = 40;
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template<typename T>
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union ValueOrHeapArray {
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T value[DEFAULT_CAPACITY];
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struct {
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T *ptr;
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int32_t capacity;
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} heap;
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};
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public:
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FormattedStringBuilder();
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~FormattedStringBuilder();
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FormattedStringBuilder(const FormattedStringBuilder &other);
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// Convention: bottom 4 bits for field, top 4 bits for field category.
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// Field category 0 implies the number category so that the number field
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// literals can be directly passed as a Field type.
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// Exported as U_I18N_API so it can be used by other exports on Windows.
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struct U_I18N_API Field {
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uint8_t bits;
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Field() = default;
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constexpr Field(uint8_t category, uint8_t field);
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inline UFieldCategory getCategory() const;
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inline int32_t getField() const;
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inline bool isNumeric() const;
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inline bool isUndefined() const;
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inline bool operator==(const Field& other) const;
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inline bool operator!=(const Field& other) const;
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};
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FormattedStringBuilder &operator=(const FormattedStringBuilder &other);
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int32_t length() const;
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int32_t codePointCount() const;
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inline char16_t charAt(int32_t index) const {
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U_ASSERT(index >= 0);
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U_ASSERT(index < fLength);
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return getCharPtr()[fZero + index];
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}
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inline Field fieldAt(int32_t index) const {
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U_ASSERT(index >= 0);
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U_ASSERT(index < fLength);
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return getFieldPtr()[fZero + index];
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}
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UChar32 getFirstCodePoint() const;
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UChar32 getLastCodePoint() const;
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UChar32 codePointAt(int32_t index) const;
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UChar32 codePointBefore(int32_t index) const;
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FormattedStringBuilder &clear();
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/** Appends a UTF-16 code unit. */
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inline int32_t appendChar16(char16_t codeUnit, Field field, UErrorCode& status) {
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// appendCodePoint handles both code units and code points.
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return insertCodePoint(fLength, codeUnit, field, status);
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}
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/** Inserts a UTF-16 code unit. Note: insert at index 0 is very efficient. */
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inline int32_t insertChar16(int32_t index, char16_t codeUnit, Field field, UErrorCode& status) {
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// insertCodePoint handles both code units and code points.
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return insertCodePoint(index, codeUnit, field, status);
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}
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/** Appends a Unicode code point. */
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inline int32_t appendCodePoint(UChar32 codePoint, Field field, UErrorCode &status) {
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return insertCodePoint(fLength, codePoint, field, status);
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}
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/** Inserts a Unicode code point. Note: insert at index 0 is very efficient. */
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int32_t insertCodePoint(int32_t index, UChar32 codePoint, Field field, UErrorCode &status);
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/** Appends a string. */
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inline int32_t append(const UnicodeString &unistr, Field field, UErrorCode &status) {
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return insert(fLength, unistr, field, status);
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}
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/** Inserts a string. Note: insert at index 0 is very efficient. */
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int32_t insert(int32_t index, const UnicodeString &unistr, Field field, UErrorCode &status);
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/** Inserts a substring. Note: insert at index 0 is very efficient.
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*
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* @param start Start index of the substring of unistr to be inserted.
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* @param end End index of the substring of unistr to be inserted (exclusive).
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*/
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int32_t insert(int32_t index, const UnicodeString &unistr, int32_t start, int32_t end, Field field,
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UErrorCode &status);
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/** Deletes a substring and then inserts a string at that same position.
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* Similar to JavaScript Array.prototype.splice().
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*
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* @param startThis Start of the span to delete.
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* @param endThis End of the span to delete (exclusive).
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* @param unistr The string to insert at the deletion position.
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* @param startOther Start index of the substring of unistr to be inserted.
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* @param endOther End index of the substring of unistr to be inserted (exclusive).
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*/
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int32_t splice(int32_t startThis, int32_t endThis, const UnicodeString &unistr,
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int32_t startOther, int32_t endOther, Field field, UErrorCode& status);
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/** Appends a formatted string. */
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int32_t append(const FormattedStringBuilder &other, UErrorCode &status);
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/** Inserts a formatted string. Note: insert at index 0 is very efficient. */
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int32_t insert(int32_t index, const FormattedStringBuilder &other, UErrorCode &status);
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/**
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* Ensures that the string buffer contains a NUL terminator. The NUL terminator does
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* not count toward the string length. Any further changes to the string (insert or
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* append) may invalidate the NUL terminator.
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*
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* You should call this method after the formatted string is completely built if you
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* plan to return a pointer to the string from a C API.
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*/
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void writeTerminator(UErrorCode& status);
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/**
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* Gets a "safe" UnicodeString that can be used even after the FormattedStringBuilder is destructed.
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*/
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UnicodeString toUnicodeString() const;
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/**
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* Gets an "unsafe" UnicodeString that is valid only as long as the FormattedStringBuilder is alive and
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* unchanged. Slightly faster than toUnicodeString().
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*/
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const UnicodeString toTempUnicodeString() const;
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UnicodeString toDebugString() const;
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const char16_t *chars() const;
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bool contentEquals(const FormattedStringBuilder &other) const;
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bool containsField(Field field) const;
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private:
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bool fUsingHeap = false;
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ValueOrHeapArray<char16_t> fChars;
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ValueOrHeapArray<Field> fFields;
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int32_t fZero = DEFAULT_CAPACITY / 2;
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int32_t fLength = 0;
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inline char16_t *getCharPtr() {
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return fUsingHeap ? fChars.heap.ptr : fChars.value;
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}
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inline const char16_t *getCharPtr() const {
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return fUsingHeap ? fChars.heap.ptr : fChars.value;
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}
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inline Field *getFieldPtr() {
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return fUsingHeap ? fFields.heap.ptr : fFields.value;
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}
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inline const Field *getFieldPtr() const {
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return fUsingHeap ? fFields.heap.ptr : fFields.value;
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}
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inline int32_t getCapacity() const {
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return fUsingHeap ? fChars.heap.capacity : DEFAULT_CAPACITY;
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}
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int32_t prepareForInsert(int32_t index, int32_t count, UErrorCode &status);
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int32_t prepareForInsertHelper(int32_t index, int32_t count, UErrorCode &status);
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int32_t remove(int32_t index, int32_t count);
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friend class FormattedValueStringBuilderImpl;
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};
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static_assert(
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std::is_pod<FormattedStringBuilder::Field>::value,
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"Field should be a POD type for efficient initialization");
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constexpr FormattedStringBuilder::Field::Field(uint8_t category, uint8_t field)
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: bits((
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U_ASSERT(category <= 0xf),
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U_ASSERT(field <= 0xf),
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static_cast<uint8_t>((category << 4) | field)
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)) {}
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/**
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* Internal constant for the undefined field for use in FormattedStringBuilder.
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*/
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constexpr FormattedStringBuilder::Field kUndefinedField = {UFIELD_CATEGORY_UNDEFINED, 0};
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/**
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* Internal field to signal "numeric" when fields are not supported in NumberFormat.
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*/
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constexpr FormattedStringBuilder::Field kGeneralNumericField = {UFIELD_CATEGORY_UNDEFINED, 1};
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inline UFieldCategory FormattedStringBuilder::Field::getCategory() const {
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return static_cast<UFieldCategory>(bits >> 4);
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}
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inline int32_t FormattedStringBuilder::Field::getField() const {
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return bits & 0xf;
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}
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inline bool FormattedStringBuilder::Field::isNumeric() const {
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return getCategory() == UFIELD_CATEGORY_NUMBER || *this == kGeneralNumericField;
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}
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inline bool FormattedStringBuilder::Field::isUndefined() const {
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return getCategory() == UFIELD_CATEGORY_UNDEFINED;
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}
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inline bool FormattedStringBuilder::Field::operator==(const Field& other) const {
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return bits == other.bits;
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}
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inline bool FormattedStringBuilder::Field::operator!=(const Field& other) const {
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return bits != other.bits;
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}
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U_NAMESPACE_END
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#endif //__NUMBER_STRINGBUILDER_H__
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#endif /* #if !UCONFIG_NO_FORMATTING */
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