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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the JavaScript 2 Prototype.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef strings_h___
#define strings_h___
#include <string>
#include "utilities.h"
#include "mem.h"
namespace JavaScript
{
// Special char16s
namespace uni {
const char16 null = '\0';
const char16 cr = '\r';
const char16 lf = '\n';
const char16 space = ' ';
const char16 ls = 0x2028;
const char16 ps = 0x2029;
}
const uint16 firstFormatChar = 0x200C; // Lowest Unicode Cf character
inline char16 widen(char ch) {return static_cast<char16>(static_cast<uchar>(ch));}
// Use char16Value to compare char16's for inequality because an
// implementation may have char16's be either signed or unsigned.
inline uint16 char16Value(char16 ch) {return static_cast<uint16>(ch);}
// A type that can hold any char16 plus one special value: ueof.
typedef uint32 char16orEOF;
const char16orEOF char16eof = static_cast<char16orEOF>(-1);
// If c is a char16, return it; if c is char16eof, return the character \uFFFF.
inline char16 char16orEOFToChar16(char16orEOF c) {return static_cast<char16>(c);}
//
// Unicode UTF-16 characters and strings
//
// A string of UTF-16 characters. Nulls are allowed just like any other
// character. The string is not null-terminated.
// Use wstring if char16 is wchar_t. Otherwise use basic_string<uint16>.
//
// Eventually we'll want to use a custom class better suited for JavaScript that
// generates less code bloat and separates the concepts of a fixed, read-only
// string from a mutable buffer that is expanding. For now, though, we use the
// standard basic_string.
typedef std::basic_string<char16> String;
typedef String string16;
typedef string16::const_iterator string16_citer;
typedef string string8;
typedef string8::const_iterator string8_citer;
String &newArenaString(Arena &arena);
String &newArenaString(Arena &arena, const String &str);
#ifndef _WIN32
// Return a String containing the characters of the null-terminated C
// string cstr (without the trailing null).
//
// This function is inline in the vain hope that some compiler would do a return
// value optimization and avoid creating and destroying a temporary String when
// widenCString is called. We can still hope....
inline String widenCString(const char *cstr) {
size_t len = strlen(cstr);
const uchar *ucstr = reinterpret_cast<const uchar *>(cstr);
return String(ucstr, ucstr+len);
}
// Widen and append length characters starting at chars to the end of str.
inline void appendChars(String &str, const char *chars, size_t length) {
const uchar *uchars = reinterpret_cast<const uchar *>(chars);
str.append(uchars, uchars + length);
}
// Widen and append characters between begin and end to the end of str.
inline void appendChars(String &str, const char *begin, const char *end) {
ASSERT(begin <= end);
str.append(reinterpret_cast<const uchar *>(begin), reinterpret_cast<const uchar *>(end));
}
// Widen and insert length characters starting at chars into the given
// position of str.
inline void insertChars(String &str, String::size_type pos, const char *chars, size_t length) {
ASSERT(pos <= str.size());
const uchar *uchars = reinterpret_cast<const uchar *>(chars);
str.insert(str.begin() + pos, uchars, uchars + length);
}
#else
// Microsoft VC6 bug: String constructor and append limited to char16 iterators
String widenCString(const char *cstr);
void appendChars(String &str, const char *chars, size_t length);
inline void appendChars(String &str, const char *begin, const char *end) {
ASSERT(begin <= end);
appendChars(str, begin, toSize_t(end - begin));
}
void insertChars(String &str, String::size_type pos, const char *chars, size_t length);
#endif
void insertChars(String &str, String::size_type pos, const char *cstr);
// Compare a region of string 1, starting at offset 1 with string 2, offset 2
// for a maximum of count characters and return true or false if the regions match
bool regionMatches(const String &str1, uint32 offset1, const String &str2, uint32 offset2, uint32 count, bool ignoreCase);
// ditto, only string 1 is a char* and offset 1 is zero
bool regionMatches(const char *str1, const String &str2, uint32 offset2, uint32 count, bool ignoreCase);
String &operator+=(String &str, const char *cstr);
String operator+(const String &str, const char *cstr);
String operator+(const char *cstr, const String &str);
inline String &operator+=(String &str, char c) {return str += widen(c);}
inline void clear(String &s) {s.resize(0);}
class CharInfo {
uint32 info; // Word from table a.
// Unicode character attribute lookup tables
static const uint8 x[];
static const uint8 y[];
static const uint32 a[];
public:
// Enumerated Unicode general category types
enum Type {
Unassigned = 0, // Cn
UppercaseLetter = 1, // Lu
LowercaseLetter = 2, // Ll
TitlecaseLetter = 3, // Lt
ModifierLetter = 4, // Lm
OtherLetter = 5, // Lo
NonSpacingMark = 6, // Mn
EnclosingMark = 7, // Me
CombiningSpacingMark = 8, // Mc
DecimalDigitNumber = 9, // Nd
LetterNumber = 10, // Nl
OtherNumber = 11, // No
SpaceSeparator = 12, // Zs
LineSeparator = 13, // Zl
ParagraphSeparator = 14, // Zp
Control = 15, // Cc
Format = 16, // Cf
PrivateUse = 18, // Co
Surrogate = 19, // Cs
DashPunctuation = 20, // Pd
StartPunctuation = 21, // Ps
EndPunctuation = 22, // Pe
ConnectorPunctuation = 23, // Pc
OtherPunctuation = 24, // Po
MathSymbol = 25, // Sm
CurrencySymbol = 26, // Sc
ModifierSymbol = 27, // Sk
OtherSymbol = 28 // So
};
enum Group {
NonIdGroup, // 0 May not be part of an identifier
FormatGroup, // 1 Format control
IdGroup, // 2 May start or continue a JS identifier (includes $ and _)
IdContinueGroup, // 3 May continue a JS identifier [(IdContinueGroup & -2) == IdGroup]
WhiteGroup, // 4 White space character (but not line break)
LineBreakGroup // 5 Line break character [(LineBreakGroup & -2) == WhiteGroup]
};
CharInfo() {}
CharInfo(char16 c): info(a[y[x[static_cast<uint16>(c)>>6]<<6 | c&0x3F]]) {}
CharInfo(const CharInfo &ci): info(ci.info) {}
friend Type cType(const CharInfo &ci) {return static_cast<Type>(ci.info & 0x1F);}
friend Group cGroup(const CharInfo &ci) {return static_cast<Group>(ci.info >> 16 & 7);}
friend bool isAlpha(const CharInfo &ci) {
return ((1<<UppercaseLetter | 1<<LowercaseLetter | 1<<TitlecaseLetter | 1<<ModifierLetter | 1<<OtherLetter) >> cType(ci) & 1) != 0;
}
friend bool isAlphanumeric(const CharInfo &ci) {
return ((1<<UppercaseLetter | 1<<LowercaseLetter | 1<<TitlecaseLetter | 1<<ModifierLetter | 1<<OtherLetter |
1<<DecimalDigitNumber | 1<<LetterNumber) >> cType(ci) & 1) != 0;
}
// Return true if this character can start a JavaScript identifier
friend bool isIdLeading(const CharInfo &ci) {return cGroup(ci) == IdGroup;}
// Return true if this character can continue a JavaScript identifier
friend bool isIdContinuing(const CharInfo &ci) {return (cGroup(ci) & -2) == IdGroup;}
// Return true if this character is a Unicode decimal digit (Nd) character
friend bool isDecimalDigit(const CharInfo &ci) {return cType(ci) == DecimalDigitNumber;}
// Return true if this character is a Unicode white space or line break character
friend bool isSpace(const CharInfo &ci) {return (cGroup(ci) & -2) == WhiteGroup;}
// Return true if this character is a Unicode line break character (LF, CR, LS, or PS)
friend bool isLineBreak(const CharInfo &ci) {return cGroup(ci) == LineBreakGroup;}
// Return true if this character is a Unicode format control character (Cf)
friend bool isFormat(const CharInfo &ci) {return cGroup(ci) == FormatGroup;}
friend bool isUpper(const CharInfo &ci) {return cType(ci) == UppercaseLetter;}
friend bool isLower(const CharInfo &ci) {return cType(ci) == LowercaseLetter;}
friend char16 toUpper(char16 c);
friend char16 toLower(char16 c);
};
inline bool isASCIIDecimalDigit(char16 c) {return c >= '0' && c <= '9';}
inline bool isASCIIOctalDigit(char16 c) {return c >= '0' && c <= '7';}
bool isASCIIHexDigit(char16 c, uint &digit);
const char16 *skipWhiteSpace(const char16 *str, const char16 *strEnd);
}
#define JS7_ISHEX(c) ((c) < 128 && isxdigit(c))
#define JS7_UNHEX(c) (uint32)(isdigit(c) ? (c) - '0' : 10 + tolower(c) - 'a')
#endif /* strings_h___ */
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