Light-weight, non-const reader class for a UCharsTrie. More...

#include <ucharstrie.h>

Inheritance diagram for icu::UCharsTrie:

Data Structures
class	Iterator
	Iterator for all of the (string, value) pairs in a UCharsTrie. More...

class	State
	UCharsTrie state object, for saving a trie's current state and resetting the trie back to this state later. More...

Public Member Functions
	UCharsTrie (ConstChar16Ptr trieUChars)
	Constructs a UCharsTrie reader instance. More...

	~UCharsTrie ()
	Destructor. More...

	UCharsTrie (const UCharsTrie &other)
	Copy constructor, copies the other trie reader object and its state, but not the char16_t array which will be shared. More...

UCharsTrie &	reset ()
	Resets this trie to its initial state. More...

uint64_t	getState64 () const
	Returns the state of this trie as a 64-bit integer. More...

UCharsTrie &	resetToState64 (uint64_t state)
	Resets this trie to the saved state. More...

const UCharsTrie &	saveState (State &state) const
	Saves the state of this trie. More...

UCharsTrie &	resetToState (const State &state)
	Resets this trie to the saved state. More...

UStringTrieResult	current () const
	Determines whether the string so far matches, whether it has a value, and whether another input char16_t can continue a matching string. More...

UStringTrieResult	first (int32_t uchar)
	Traverses the trie from the initial state for this input char16_t. More...

UStringTrieResult	firstForCodePoint (UChar32 cp)
	Traverses the trie from the initial state for the one or two UTF-16 code units for this input code point. More...

UStringTrieResult	next (int32_t uchar)
	Traverses the trie from the current state for this input char16_t. More...

UStringTrieResult	nextForCodePoint (UChar32 cp)
	Traverses the trie from the current state for the one or two UTF-16 code units for this input code point. More...

UStringTrieResult	next (ConstChar16Ptr s, int32_t length)
	Traverses the trie from the current state for this string. More...

int32_t	getValue () const
	Returns a matching string's value if called immediately after current()/first()/next() returned USTRINGTRIE_INTERMEDIATE_VALUE or USTRINGTRIE_FINAL_VALUE. More...

UBool	hasUniqueValue (int32_t &uniqueValue) const
	Determines whether all strings reachable from the current state map to the same value. More...

int32_t	getNextUChars (Appendable &out) const
	Finds each char16_t which continues the string from the current state. More...

Friends
class	UCharsTrieBuilder

Detailed Description

Light-weight, non-const reader class for a UCharsTrie.

Traverses a char16_t-serialized data structure with minimal state, for mapping strings (16-bit-unit sequences) to non-negative integer values.

This class owns the serialized trie data only if it was constructed by the builder's build() method. The public constructor and the copy constructor only alias the data (only copy the pointer). There is no assignment operator.

This class is not intended for public subclassing.

Stable:: ICU 4.8

Definition at line 53 of file ucharstrie.h.

Constructor & Destructor Documentation

◆ UCharsTrie() [1/2]

icu::UCharsTrie::UCharsTrie ( ConstChar16Ptr trieUChars )

inline

Constructs a UCharsTrie reader instance.

The trieUChars must contain a copy of a char16_t sequence from the UCharsTrieBuilder, starting with the first char16_t of that sequence. The UCharsTrie object will not read more char16_ts than the UCharsTrieBuilder generated in the corresponding build() call.

The array is not copied/cloned and must not be modified while the UCharsTrie object is in use.

Parameters

trieUChars The char16_t array that contains the serialized trie.

Stable:: ICU 4.8

Definition at line 69 of file ucharstrie.h.

◆ ~UCharsTrie()

icu::UCharsTrie::~UCharsTrie ( )

Destructor.

Stable:: ICU 4.8

◆ UCharsTrie() [2/2]

icu::UCharsTrie::UCharsTrie ( const UCharsTrie & other )

inline

Copy constructor, copies the other trie reader object and its state, but not the char16_t array which will be shared.

(Shallow copy.)

Parameters

other Another UCharsTrie object.

Stable:: ICU 4.8

Definition at line 85 of file ucharstrie.h.

Member Function Documentation

◆ current()

UStringTrieResult icu::UCharsTrie::current ( ) const

Determines whether the string so far matches, whether it has a value, and whether another input char16_t can continue a matching string.

Returns: The match/value Result.

Stable:: ICU 4.8

◆ first()

UStringTrieResult icu::UCharsTrie::first ( int32_t uchar )

inline

Traverses the trie from the initial state for this input char16_t.

Equivalent to reset().next(uchar).

Parameters

uchar Input char value. Values below 0 and above 0xffff will never match.

Returns: The match/value Result.

Stable:: ICU 4.8

Definition at line 202 of file ucharstrie.h.

◆ firstForCodePoint()

UStringTrieResult icu::UCharsTrie::firstForCodePoint ( UChar32 cp )

Traverses the trie from the initial state for the one or two UTF-16 code units for this input code point.

Equivalent to reset().nextForCodePoint(cp).

Parameters

cp	A Unicode code point 0..0x10ffff.

Returns: The match/value Result.

Stable:: ICU 4.8

◆ getNextUChars()

int32_t icu::UCharsTrie::getNextUChars ( Appendable & out ) const

Finds each char16_t which continues the string from the current state.

That is, each char16_t c for which it would be next(c)!=USTRINGTRIE_NO_MATCH now.

Parameters

out	Each next char16_t is appended to this object.

Returns: the number of char16_ts which continue the string from here

Stable:: ICU 4.8

◆ getState64()

uint64_t icu::UCharsTrie::getState64 ( ) const

inline

Returns the state of this trie as a 64-bit integer.

The state value is never 0.

Returns: opaque state value

See also: resetToState64

Draft:: This API may be changed in the future versions and was introduced in ICU 65

Definition at line 109 of file ucharstrie.h.

◆ getValue()

int32_t icu::UCharsTrie::getValue ( ) const

inline

Returns a matching string's value if called immediately after current()/first()/next() returned USTRINGTRIE_INTERMEDIATE_VALUE or USTRINGTRIE_FINAL_VALUE.

getValue() can be called multiple times.

Do not call getValue() after USTRINGTRIE_NO_MATCH or USTRINGTRIE_NO_VALUE!

Returns: The value for the string so far.

Stable:: ICU 4.8

Definition at line 260 of file ucharstrie.h.

◆ hasUniqueValue()

UBool icu::UCharsTrie::hasUniqueValue ( int32_t & uniqueValue ) const

inline

Determines whether all strings reachable from the current state map to the same value.

Parameters

uniqueValue Receives the unique value, if this function returns TRUE. (output-only)

Returns: TRUE if all strings reachable from the current state map to the same value.

Stable:: ICU 4.8

Definition at line 277 of file ucharstrie.h.

References FALSE, and NULL.

◆ next() [1/2]

UStringTrieResult icu::UCharsTrie::next ( int32_t uchar )

Traverses the trie from the current state for this input char16_t.

Parameters

uchar Input char value. Values below 0 and above 0xffff will never match.

Returns: The match/value Result.

Stable:: ICU 4.8

◆ next() [2/2]

UStringTrieResult icu::UCharsTrie::next	(	ConstChar16Ptr	s,
		int32_t	length
	)

Traverses the trie from the current state for this string.

Equivalent to

Result result=current();
for(each c in s)
  if(!USTRINGTRIE_HAS_NEXT(result)) return USTRINGTRIE_NO_MATCH;
  result=next(c);
return result;

Parameters

s	A string. Can be NULL if length is 0.
length	The length of the string. Can be -1 if NUL-terminated.

Returns: The match/value Result.

Stable:: ICU 4.8

◆ nextForCodePoint()

UStringTrieResult icu::UCharsTrie::nextForCodePoint ( UChar32 cp )

Traverses the trie from the current state for the one or two UTF-16 code units for this input code point.

Parameters

cp	A Unicode code point 0..0x10ffff.

Returns: The match/value Result.

Stable:: ICU 4.8

◆ reset()

UCharsTrie& icu::UCharsTrie::reset ( void )

inline

Resets this trie to its initial state.

Returns: *this

Stable:: ICU 4.8

Definition at line 94 of file ucharstrie.h.

◆ resetToState()

UCharsTrie& icu::UCharsTrie::resetToState ( const State & state )

inline

Resets this trie to the saved state.

If the state object contains no state, or the state of a different trie, then this trie remains unchanged.

Parameters

state The State object which holds a saved trie state.

Returns: *this

See also: saveState; reset

Stable:: ICU 4.8

Definition at line 179 of file ucharstrie.h.

References NULL.

◆ resetToState64()

UCharsTrie& icu::UCharsTrie::resetToState64 ( uint64_t state )

inline

Resets this trie to the saved state.

Unlike resetToState(State), the 64-bit state value must be from getState64() from the same trie object or from one initialized the exact same way. Because of no validation, this method is faster.

Parameters

state The opaque trie state value from getState64().

Returns: *this

See also: getState64; resetToState; reset

Draft:: This API may be changed in the future versions and was introduced in ICU 65

Definition at line 128 of file ucharstrie.h.

◆ saveState()

const UCharsTrie& icu::UCharsTrie::saveState ( State & state ) const

inline

Saves the state of this trie.

Parameters

state The State object to hold the trie's state.

Returns: *this

See also: resetToState

Stable:: ICU 4.8

Definition at line 162 of file ucharstrie.h.

The documentation for this class was generated from the following file:

ucharstrie.h

Data Structures

Public Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

◆ UCharsTrie() [1/2]

◆ ~UCharsTrie()

◆ UCharsTrie() [2/2]

Member Function Documentation

◆ current()

◆ first()

◆ firstForCodePoint()

◆ getNextUChars()

◆ getState64()

◆ getValue()

◆ hasUniqueValue()

◆ next() [1/2]

◆ next() [2/2]

◆ nextForCodePoint()

◆ reset()

◆ resetToState()

◆ resetToState64()

◆ saveState()