nsAutoString

In This Article
  1. Method Overview
  2. Base Classes
  3. Data Members
  4. Methods
    1. Constructors
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
      5. Parameters
    2. operator=
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
      5. Parameters
      6. Parameters
    3. get
    4. Find
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
    5. RFind
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
    6. RFindChar
      1. Parameters
    7. FindCharInSet
      1. Parameters
      2. Parameters
      3. Parameters
    8. RFindCharInSet
      1. Parameters
      2. Parameters
    9. EqualsIgnoreCase
      1. Parameters
    10. ToFloat
      1. Parameters
    11. ToInteger
      1. Parameters
    12. Mid
      1. Parameters
    13. Left
      1. Parameters
    14. Right
      1. Parameters
    15. SetCharAt
      1. Parameters
    16. StripChars
      1. Parameters
    17. StripWhitespace
    18. ReplaceChar
      1. Parameters
      2. Parameters
    19. ReplaceSubstring
      1. Parameters
      2. Parameters
    20. Trim
      1. Parameters
    21. CompressWhitespace
      1. Parameters
    22. AssignWithConversion
      1. Parameters
      2. Parameters
    23. AppendWithConversion
      1. Parameters
      2. Parameters
    24. AppendInt
      1. Parameters
      2. Parameters
      3. Parameters
    25. AppendFloat
      1. Parameters
      2. Parameters
    26. BeginReading
      1. Parameters
      2. Parameters
    27. EndReading
      1. Parameters
      2. Parameters
    28. BeginWriting
      1. Parameters
      2. Parameters
    29. EndWriting
      1. Parameters
      2. Parameters
    30. Data
    31. Length
    32. IsEmpty
    33. IsVoid
    34. IsTerminated
    35. CharAt
      1. Parameters
    36. operator[]
      1. Parameters
    37. First
    38. Last
    39. CountChar
      1. Parameters
    40. FindChar
      1. Parameters
    41. Equals
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
    42. EqualsASCII
      1. Parameters
      2. Parameters
    43. EqualsLiteral(const char
    44. EqualsLiteral(char
    45. LowerCaseEqualsASCII
      1. Parameters
      2. Parameters
    46. LowerCaseEqualsLiteral(const char
    47. LowerCaseEqualsLiteral(char
    48. Assign
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
    49. AssignASCII
      1. Parameters
      2. Parameters
    50. AssignLiteral(const char
    51. AssignLiteral(char
    52. Adopt
      1. Parameters
    53. Replace
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
    54. ReplaceASCII
      1. Parameters
    55. Append
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
    56. AppendASCII
      1. Parameters
    57. AppendLiteral(const char
    58. AppendLiteral(char
    59. operator+=
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
    60. Insert
      1. Parameters
      2. Parameters
      3. Parameters
      4. Parameters
    61. Cut
      1. Parameters
    62. SetCapacity
      1. Parameters
    63. SetLength
      1. Parameters
    64. Truncate
      1. Parameters
    65. GetData
      1. Parameters
    66. GetMutableData
      1. Parameters
    67. SetIsVoid
      1. Parameters
    68. StripChar
      1. Parameters
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Class Declaration

nsTAutoString_CharT

Subclass of nsTString_CharT that adds support for stack-based string
allocation.  It is normally not a good idea to use this class on the
heap, because it will allocate space which may be wasted if the string
it contains is significantly smaller or any larger than 64 characters.

NAMES:
nsAutoString for wide characters
nsCAutoString for narrow characters

Method Overview

Constructors
operator=
get
Find
RFind
RFindChar
FindCharInSet
RFindCharInSet
EqualsIgnoreCase
ToFloat
ToInteger
Mid
Left
Right
SetCharAt
StripChars
StripWhitespace
ReplaceChar
ReplaceSubstring
Trim
CompressWhitespace
AssignWithConversion
AppendWithConversion
AppendInt
AppendFloat
BeginReading
EndReading
BeginWriting
EndWriting
Data
Length
IsEmpty
IsVoid
IsTerminated
CharAt
operator[]
First
Last
CountChar
FindChar
Equals
EqualsASCII
EqualsLiteral(const char
EqualsLiteral(char
LowerCaseEqualsASCII
LowerCaseEqualsLiteral(const char
LowerCaseEqualsLiteral(char
Assign
AssignASCII
AssignLiteral(const char
AssignLiteral(char
Adopt
Replace
ReplaceASCII
Append
AppendASCII
AppendLiteral(const char
AppendLiteral(char
operator+=
Insert
Cut
SetCapacity
SetLength
Truncate
GetData
GetMutableData
SetIsVoid
StripChar

Base Classes

Data Members

No public members.

Methods

Constructors

void nsAutoString() - source
constructors
void nsAutoString(PRUnichar) - source

Parameters

  • PRUnichar c
void nsAutoString(const PRUnichar*, PRUint32) - source

Parameters

  • PRUnichar* data
  • PRUint32 length
void nsAutoString(const nsAutoString&) - source

Parameters

  • nsAutoString& str
void nsAutoString(const nsAString_internal&) - source

Parameters

  • nsAString_internal& str
void nsAutoString(const nsSubstringTuple&) - source

Parameters

  • nsSubstringTuple& tuple

operator=

nsAutoString& operator=(const nsAutoString&) - source

Parameters

  • nsAutoString& str
nsString& operator=(const nsString&) - source

Parameters

  • nsString& str
nsAString_internal& operator=(PRUnichar) - source

Parameters

  • PRUnichar c
nsAString_internal& operator=(const PRUnichar*) - source

Parameters

  • PRUnichar* data
nsAString_internal& operator=(const nsAString_internal&) - source

Parameters

  • nsAString_internal& str
nsAString_internal& operator=(const nsSubstringTuple&) - source

Parameters

  • nsSubstringTuple& tuple

get

PRUnichar* get() const - source
returns the null-terminated string

Find

PRInt32 Find(const nsCString&, PRBool, PRInt32, PRInt32) const - source
Search for the given substring within this string.

@param   aString is substring to be sought in this
@param   aIgnoreCase selects case sensitivity
@param   aOffset tells us where in this string to start searching
@param   aCount tells us how far from the offset we are to search. Use
-1 to search the whole string.
@return  offset in string, or kNotFound

Parameters

  • nsCString& aString
  • PRBool aIgnoreCase
  • PRInt32 aOffset
  • PRInt32 aCount
PRInt32 Find(const char*, PRBool, PRInt32, PRInt32) const - source

Parameters

  • char* aString
  • PRBool aIgnoreCase
  • PRInt32 aOffset
  • PRInt32 aCount
PRInt32 Find(const nsAFlatString&, PRInt32, PRInt32) const - source

Parameters

  • nsAFlatString& aString
  • PRInt32 aOffset
  • PRInt32 aCount
PRInt32 Find(const PRUnichar*, PRInt32, PRInt32) const - source

Parameters

  • PRUnichar* aString
  • PRInt32 aOffset
  • PRInt32 aCount

RFind

PRInt32 RFind(const nsCString&, PRBool, PRInt32, PRInt32) const - source
This methods scans the string backwards, looking for the given string

@param   aString is substring to be sought in this
@param   aIgnoreCase tells us whether or not to do caseless compare
@param   aOffset tells us where in this string to start searching.
Use -1 to search from the end of the string.
@param   aCount tells us how many iterations to make starting at the
given offset.
@return  offset in string, or kNotFound

Parameters

  • nsCString& aString
  • PRBool aIgnoreCase
  • PRInt32 aOffset
  • PRInt32 aCount
PRInt32 RFind(const char*, PRBool, PRInt32, PRInt32) const - source

Parameters

  • char* aCString
  • PRBool aIgnoreCase
  • PRInt32 aOffset
  • PRInt32 aCount
PRInt32 RFind(const nsAFlatString&, PRInt32, PRInt32) const - source

Parameters

  • nsAFlatString& aString
  • PRInt32 aOffset
  • PRInt32 aCount
PRInt32 RFind(const PRUnichar*, PRInt32, PRInt32) const - source

Parameters

  • PRUnichar* aString
  • PRInt32 aOffset
  • PRInt32 aCount

RFindChar

PRInt32 RFindChar(PRUnichar, PRInt32, PRInt32) const - source

Parameters

  • PRUnichar aChar
  • PRInt32 aOffset
  • PRInt32 aCount

FindCharInSet

PRInt32 FindCharInSet(const char*, PRInt32) const - source
This method searches this string for the first character found in
the given string.

@param aString contains set of chars to be found
@param aOffset tells us where in this string to start searching
(counting from left)
@return offset in string, or kNotFound

Parameters

  • char* aString
  • PRInt32 aOffset
PRInt32 FindCharInSet(const nsString&, PRInt32) const - source

Parameters

  • nsString& aString
  • PRInt32 aOffset
PRInt32 FindCharInSet(const PRUnichar*, PRInt32) const - source

Parameters

  • PRUnichar* aString
  • PRInt32 aOffset

RFindCharInSet

PRInt32 RFindCharInSet(const PRUnichar*, PRInt32) const - source
This method searches this string for the last character found in
the given string.

@param aString contains set of chars to be found
@param aOffset tells us where in this string to start searching
(counting from left)
@return offset in string, or kNotFound

Parameters

  • PRUnichar* aString
  • PRInt32 aOffset
PRInt32 RFindCharInSet(const nsString&, PRInt32) const - source

Parameters

  • nsString& aString
  • PRInt32 aOffset

EqualsIgnoreCase

PRBool EqualsIgnoreCase(const char*, PRInt32) const - source

Parameters

  • char* aString
  • PRInt32 aCount

ToFloat

float ToFloat(PRInt32*) const - source
Perform string to float conversion.

@param   aErrorCode will contain error if one occurs
@return  float rep of string value

Parameters

  • PRInt32* aErrorCode

ToInteger

PRInt32 ToInteger(PRInt32*, PRUint32) const - source

Parameters

  • PRInt32* aErrorCode
  • PRUint32 aRadix

Mid

PRUint32 Mid(nsString&, PRUint32, PRUint32) const - source

Parameters

  • nsString& aResult
  • PRUint32 aStartPos
  • PRUint32 aCount

Left

PRUint32 Left(nsString&, PRUint32) const - source

Parameters

  • nsString& aResult
  • PRUint32 aCount
PRUint32 Right(nsString&, PRUint32) const - source

Parameters

  • nsString& aResult
  • PRUint32 aCount

SetCharAt

PRBool SetCharAt(PRUnichar, PRUint32) - source
Set a char inside this string at given index

@param aChar is the char you want to write into this string
@param anIndex is the ofs where you want to write the given char
@return TRUE if successful

Parameters

  • PRUnichar aChar
  • PRUint32 aIndex

StripChars

void StripChars(const char*) - source
These methods are used to remove all occurrences of the
characters found in aSet from this string.

@param  aSet -- characters to be cut from this

Parameters

  • char* aSet

StripWhitespace

void StripWhitespace() - source
This method strips whitespace throughout the string.

ReplaceChar

void ReplaceChar(PRUnichar, PRUnichar) - source
swaps occurence of 1 string for another

Parameters

  • PRUnichar aOldChar
  • PRUnichar aNewChar
void ReplaceChar(const char*, PRUnichar) - source

Parameters

  • char* aSet
  • PRUnichar aNewChar

ReplaceSubstring

void ReplaceSubstring(const nsString&, const nsString&) - source

Parameters

  • nsString& aTarget
  • nsString& aNewValue
void ReplaceSubstring(const PRUnichar*, const PRUnichar*) - source

Parameters

  • PRUnichar* aTarget
  • PRUnichar* aNewValue

Trim

void Trim(const char*, PRBool, PRBool, PRBool) - source
This method trims characters found in aTrimSet from
either end of the underlying string.

@param   aSet -- contains chars to be trimmed from both ends
@param   aEliminateLeading
@param   aEliminateTrailing
@param   aIgnoreQuotes -- if true, causes surrounding quotes to be ignored
@return  this

Parameters

  • char* aSet
  • PRBool aEliminateLeading
  • PRBool aEliminateTrailing
  • PRBool aIgnoreQuotes

CompressWhitespace

void CompressWhitespace(PRBool, PRBool) - source
This method strips whitespace from string.
You can control whether whitespace is yanked from start and end of
string as well.

@param   aEliminateLeading controls stripping of leading ws
@param   aEliminateTrailing controls stripping of trailing ws

Parameters

  • PRBool aEliminateLeading
  • PRBool aEliminateTrailing

AssignWithConversion

void AssignWithConversion(const nsACString_internal&) - source
assign/append/insert with _LOSSY_ conversion

Parameters

  • nsACString_internal& aString
void AssignWithConversion(const char*, PRInt32) - source

Parameters

  • char* aData
  • PRInt32 aLength

AppendWithConversion

void AppendWithConversion(const nsACString_internal&) - source

Parameters

  • nsACString_internal& aString
void AppendWithConversion(const char*, PRInt32) - source

Parameters

  • char* aData
  • PRInt32 aLength

AppendInt

void AppendInt(PRInt32, PRInt32) - source
Append the given integer to this string

Parameters

  • PRInt32 aInteger
  • PRInt32 aRadix
void AppendInt(PRUint32, PRInt32) - source
Append the given unsigned integer to this string

Parameters

  • PRUint32 aInteger
  • PRInt32 aRadix
void AppendInt(PRInt64, PRInt32) - source

Parameters

  • PRInt64 aInteger
  • PRInt32 aRadix

AppendFloat

void AppendFloat(float) - source
Append the given float to this string

Parameters

  • float aFloat
void AppendFloat(double) - source

Parameters

  • double aFloat

BeginReading

PRUnichar* BeginReading() const - source
reading iterators
nsReadingIterator<short unsigned int>& BeginReading(nsReadingIterator<short unsigned int>&) const - source
deprecated reading iterators

Parameters

  • nsReadingIterator<short unsigned int>& iter
PRUnichar*& BeginReading(const PRUnichar*&) const - source

Parameters

  • PRUnichar*& iter

EndReading

PRUnichar* EndReading() const - source
nsReadingIterator<short unsigned int>& EndReading(nsReadingIterator<short unsigned int>&) const - source

Parameters

  • nsReadingIterator<short unsigned int>& iter
PRUnichar*& EndReading(const PRUnichar*&) const - source

Parameters

  • PRUnichar*& iter

BeginWriting

PRUnichar* BeginWriting() - source
writing iterators
nsWritingIterator<short unsigned int>& BeginWriting(nsWritingIterator<short unsigned int>&) - source
deprecated writing iterators

Parameters

  • nsWritingIterator<short unsigned int>& iter
PRUnichar*& BeginWriting(PRUnichar*&) - source

Parameters

  • PRUnichar*& iter

EndWriting

PRUnichar* EndWriting() - source
nsWritingIterator<short unsigned int>& EndWriting(nsWritingIterator<short unsigned int>&) - source

Parameters

  • nsWritingIterator<short unsigned int>& iter
PRUnichar*& EndWriting(PRUnichar*&) - source

Parameters

  • PRUnichar*& iter

Data

PRUnichar* Data() const - source
accessors

Length

PRUint32 Length() const - source

IsEmpty

PRBool IsEmpty() const - source

IsVoid

PRBool IsVoid() const - source

IsTerminated

PRBool IsTerminated() const - source

CharAt

PRUnichar CharAt(PRUint32) const - source

Parameters

  • PRUint32 i

operator[]

PRUnichar operator[](PRUint32) const - source

Parameters

  • PRUint32 i

First

PRUnichar First() const - source

Last

PRUnichar Last() const - source

CountChar

PRUint32 CountChar(PRUnichar) const - source

Parameters

  • PRUnichar <anonymous>

FindChar

PRInt32 FindChar(PRUnichar, PRUint32) const - source

Parameters

  • PRUnichar <anonymous>
  • PRUint32 offset

Equals

PRBool Equals(const nsAString_internal&) const - source
equality

Parameters

  • nsAString_internal& <anonymous>
PRBool Equals(const nsAString_internal&, const nsStringComparator&) const - source

Parameters

  • nsAString_internal& <anonymous>
  • nsStringComparator& <anonymous>
PRBool Equals(const PRUnichar*) const - source

Parameters

  • PRUnichar* data
PRBool Equals(const PRUnichar*, const nsStringComparator&) const - source

Parameters

  • PRUnichar* data
  • nsStringComparator& comp

EqualsASCII

PRBool EqualsASCII(const char*, PRUint32) const - source
An efficient comparison with ASCII that can be used even
for wide strings. Call this version when you know the
length of 'data'.

Parameters

  • char* data
  • PRUint32 len
PRBool EqualsASCII(const char*) const - source
An efficient comparison with ASCII that can be used even
for wide strings. Call this version when 'data' is
null-terminated.

Parameters

  • char* data

EqualsLiteral(const char

PRBool EqualsLiteral(const char (&)[N]) const - source

EqualsLiteral(char

PRBool EqualsLiteral(char (&)[N]) const - source

LowerCaseEqualsASCII

PRBool LowerCaseEqualsASCII(const char*, PRUint32) const - source

Parameters

  • char* data
  • PRUint32 len
PRBool LowerCaseEqualsASCII(const char*) const - source

Parameters

  • char* data

LowerCaseEqualsLiteral(const char

PRBool LowerCaseEqualsLiteral(const char (&)[N]) const - source

LowerCaseEqualsLiteral(char

PRBool LowerCaseEqualsLiteral(char (&)[N]) const - source

Assign

void Assign(PRUnichar) - source
assignment

Parameters

  • PRUnichar c
void Assign(const PRUnichar*, PRUint32) - source

Parameters

  • PRUnichar* data
  • PRUint32 length
void Assign(const nsAString_internal&) - source

Parameters

  • nsAString_internal& <anonymous>
void Assign(const nsSubstringTuple&) - source

Parameters

  • nsSubstringTuple& <anonymous>

AssignASCII

void AssignASCII(const char*, PRUint32) - source

Parameters

  • char* data
  • PRUint32 length
void AssignASCII(const char*) - source

Parameters

  • char* data

AssignLiteral(const char

void AssignLiteral(const char (&)[N]) - source

AssignLiteral(char

void AssignLiteral(char (&)[N]) - source

Adopt

void Adopt(PRUnichar*, PRUint32) - source

Parameters

  • PRUnichar* data
  • PRUint32 length

Replace

void Replace(PRUint32, PRUint32, PRUnichar) - source
buffer manipulation

Parameters

  • PRUint32 cutStart
  • PRUint32 cutLength
  • PRUnichar c
void Replace(PRUint32, PRUint32, const PRUnichar*, PRUint32) - source

Parameters

  • PRUint32 cutStart
  • PRUint32 cutLength
  • PRUnichar* data
  • PRUint32 length
void Replace(PRUint32, PRUint32, const nsAString_internal&) - source

Parameters

  • PRUint32 cutStart
  • PRUint32 cutLength
  • nsAString_internal& str
void Replace(PRUint32, PRUint32, const nsSubstringTuple&) - source

Parameters

  • PRUint32 cutStart
  • PRUint32 cutLength
  • nsSubstringTuple& tuple

ReplaceASCII

void ReplaceASCII(PRUint32, PRUint32, const char*, PRUint32) - source

Parameters

  • PRUint32 cutStart
  • PRUint32 cutLength
  • char* data
  • PRUint32 length

Append

void Append(PRUnichar) - source

Parameters

  • PRUnichar c
void Append(const PRUnichar*, PRUint32) - source

Parameters

  • PRUnichar* data
  • PRUint32 length
void Append(const nsAString_internal&) - source

Parameters

  • nsAString_internal& str
void Append(const nsSubstringTuple&) - source

Parameters

  • nsSubstringTuple& tuple

AppendASCII

void AppendASCII(const char*, PRUint32) - source

Parameters

  • char* data
  • PRUint32 length

AppendLiteral(const char

void AppendLiteral(const char (&)[N]) - source

AppendLiteral(char

void AppendLiteral(char (&)[N]) - source

operator+=

nsAString_internal& operator+=(PRUnichar) - source

Parameters

  • PRUnichar c
nsAString_internal& operator+=(const PRUnichar*) - source

Parameters

  • PRUnichar* data
nsAString_internal& operator+=(const nsAString_internal&) - source

Parameters

  • nsAString_internal& str
nsAString_internal& operator+=(const nsSubstringTuple&) - source

Parameters

  • nsSubstringTuple& tuple

Insert

void Insert(PRUnichar, PRUint32) - source

Parameters

  • PRUnichar c
  • PRUint32 pos
void Insert(const PRUnichar*, PRUint32, PRUint32) - source

Parameters

  • PRUnichar* data
  • PRUint32 pos
  • PRUint32 length
void Insert(const nsAString_internal&, PRUint32) - source

Parameters

  • nsAString_internal& str
  • PRUint32 pos
void Insert(const nsSubstringTuple&, PRUint32) - source

Parameters

  • nsSubstringTuple& tuple
  • PRUint32 pos

Cut

void Cut(PRUint32, PRUint32) - source

Parameters

  • PRUint32 cutStart
  • PRUint32 cutLength

SetCapacity

void SetCapacity(PRUint32) - source
buffer sizing

Parameters

  • PRUint32 newCapacity

SetLength

void SetLength(PRUint32) - source

Parameters

  • PRUint32 newLength

Truncate

void Truncate(PRUint32) - source

Parameters

  • PRUint32 newLength

GetData

PRUint32 GetData(const PRUnichar**) const - source
Get a const pointer to the string's internal buffer.  The caller
MUST NOT modify the characters at the returned address.

@returns The length of the buffer in characters.

Parameters

  • PRUnichar** data

GetMutableData

PRUint32 GetMutableData(PRUnichar**, PRUint32) - source
Get a pointer to the string's internal buffer, optionally resizing
the buffer first.  If size_type(-1) is passed for newLen, then the
current length of the string is used.  The caller MAY modify the
characters at the returned address (up to but not exceeding the
length of the string).

@returns The length of the buffer in characters or 0 if unable to
satisfy the request due to low-memory conditions.

Parameters

  • PRUnichar** data
  • PRUint32 newLen

SetIsVoid

void SetIsVoid(PRBool) - source
string data is never null, but can be marked void.  if true, the
string will be truncated.  @see nsTSubstring::IsVoid

Parameters

  • PRBool <anonymous>

StripChar

void StripChar(PRUnichar, PRInt32) - source
This method is used to remove all occurrences of aChar from this
string.

@param  aChar -- char to be stripped
@param  aOffset -- where in this string to start stripping chars

Parameters

  • PRUnichar aChar
  • PRInt32 aOffset

Document Tags and Contributors

Contributors to this page: Benjamin Smedberg
最終更新者: Benjamin Smedberg,