mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-08 12:37:37 +00:00
408 lines
13 KiB
C++
408 lines
13 KiB
C++
// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
//
|
|
// The contents of this file are subject to the Netscape 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/NPL/
|
|
//
|
|
// Software distributed under the License is distributed on an "AS
|
|
// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
|
|
// 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 Netscape are
|
|
// Copyright (C) 1998 Netscape Communications Corporation. All
|
|
// Rights Reserved.
|
|
|
|
#ifndef utilities_h
|
|
#define utilities_h
|
|
|
|
#include "systemtypes.h"
|
|
#include <memory>
|
|
#include <string>
|
|
#include <iostream>
|
|
|
|
#ifndef _WIN32 // Microsoft VC6 bug: standard identifiers should be in std namespace
|
|
using std::size_t;
|
|
using std::ptrdiff_t;
|
|
using std::strlen;
|
|
using std::strcpy;
|
|
#define STD std
|
|
#else
|
|
#define STD
|
|
#endif
|
|
using std::string;
|
|
using std::istream;
|
|
using std::ostream;
|
|
using std::auto_ptr;
|
|
|
|
namespace JavaScript {
|
|
|
|
|
|
//
|
|
// Assertions
|
|
//
|
|
|
|
#ifdef DEBUG
|
|
void Assert(const char *s, const char *file, int line);
|
|
|
|
#define ASSERT(_expr) ((_expr) ? (void)0 : JavaScript::Assert(#_expr, __FILE__, __LINE__))
|
|
#define NOT_REACHED(_reasonStr) JavaScript::Assert(_reasonStr, __FILE__, __LINE__)
|
|
#define DEBUG_ONLY(_stmt) _stmt
|
|
#else
|
|
#define ASSERT(expr)
|
|
#define NOT_REACHED(reasonStr)
|
|
#define DEBUG_ONLY(_stmt)
|
|
#endif
|
|
|
|
|
|
//
|
|
// Numerics
|
|
//
|
|
|
|
template<class N> N min(N v1, N v2) {return v1 <= v2 ? v1 : v2;}
|
|
template<class N> N max(N v1, N v2) {return v1 >= v2 ? v1 : v2;}
|
|
|
|
//
|
|
// Bit manipulation
|
|
//
|
|
|
|
#define JS_BIT(n) ((uint32)1 << (n))
|
|
#define JS_BITMASK(n) (JS_BIT(n) - 1)
|
|
|
|
uint ceilingLog2(uint32 n);
|
|
uint floorLog2(uint32 n);
|
|
|
|
|
|
//
|
|
// 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 uint32 char16orEOF; // A type that can hold any char16 plus one special value: ueof.
|
|
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);}
|
|
|
|
// Special char16s
|
|
namespace uni {
|
|
const char16 null = '\0';
|
|
const char16 cr = '\r';
|
|
const char16 lf = '\n';
|
|
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));}
|
|
|
|
#ifndef _WIN32
|
|
// Return a String containing the characters of the null-terminated C string cstr
|
|
// (without the trailing null).
|
|
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);
|
|
}
|
|
#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);
|
|
#endif
|
|
|
|
|
|
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';}
|
|
bool isASCIIHexDigit(char16 c, uint &digit);
|
|
|
|
const char16 *skipWhiteSpace(const char16 *str, const char16 *strEnd);
|
|
|
|
|
|
//
|
|
// Array auto_ptr's
|
|
//
|
|
|
|
// An ArrayAutoPtr holds a pointer to an array initialized by new T[x].
|
|
// A regular auto_ptr cannot be used here because it deletes its pointer using
|
|
// delete rather than delete[].
|
|
// An appropriate operator[] is also provided.
|
|
template <typename T>
|
|
class ArrayAutoPtr {
|
|
T *ptr;
|
|
|
|
public:
|
|
explicit ArrayAutoPtr(T *p = 0): ptr(p) {}
|
|
ArrayAutoPtr(ArrayAutoPtr &a): ptr(a.ptr) {a.ptr = 0;}
|
|
ArrayAutoPtr &operator=(ArrayAutoPtr &a) {reset(a.release());}
|
|
~ArrayAutoPtr() {delete[] ptr;}
|
|
|
|
T &operator*() const {return *ptr;}
|
|
T &operator->() const {return *ptr;}
|
|
template<class N> T &operator[](N i) const {return ptr[i];}
|
|
T *get() const {return ptr;}
|
|
T *release() {T *p = ptr; ptr = 0; return p;}
|
|
void reset(T *p = 0) {delete[] ptr; ptr = p;}
|
|
};
|
|
|
|
typedef ArrayAutoPtr<char> CharAutoPtr;
|
|
|
|
|
|
//
|
|
// Growable arrays
|
|
//
|
|
|
|
// private
|
|
template <typename T>
|
|
class ProtoArrayBuffer {
|
|
protected:
|
|
T *buffer;
|
|
int32 length;
|
|
int32 bufferSize;
|
|
|
|
void append(const T *elts, int32 nElts, T *cache);
|
|
};
|
|
|
|
|
|
// private
|
|
template <typename T>
|
|
void ProtoArrayBuffer<T>::append(const T *elts, int32 nElts, T *cache)
|
|
{
|
|
assert(nElts >= 0);
|
|
int32 newLength = length + nElts;
|
|
if (newLength > bufferSize) {
|
|
// Allocate a new buffer and copy the current buffer's contents there.
|
|
int32 newBufferSize = newLength + bufferSize;
|
|
auto_ptr<T> newBuffer = new T[newBufferSize];
|
|
T *p = buffer;
|
|
T *pLimit = old + length;
|
|
T *q = newBuffer.get();
|
|
while (p != pLimit)
|
|
*q++ = *p++;
|
|
if (buffer != cache)
|
|
delete buffer;
|
|
buffer = newBuffer.release();
|
|
bufferSize = newBufferSize;
|
|
}
|
|
length = newLength;
|
|
}
|
|
|
|
|
|
// An ArrayBuffer represents an array of elements of type T. The ArrayBuffer contains
|
|
// storage for a fixed size array of cacheSize elements; if this size is exceeded, the
|
|
// ArrayBuffer allocates the array from the heap.
|
|
// Use append to append nElts elements to the end of the ArrayBuffer.
|
|
template <typename T, int32 cacheSize>
|
|
class ArrayBuffer: public ProtoArrayBuffer<T> {
|
|
T cache[cacheSize];
|
|
|
|
public:
|
|
ArrayBuffer() {buffer = &cache; length = cacheSize; bufferSize = cacheSize;}
|
|
~ArrayBuffer() {if (buffer != &cache) delete buffer;}
|
|
|
|
int32 size() const {return length;}
|
|
T *front() const {return buffer;}
|
|
void append(const T *elts, int32 nElts) {ProtoArrayBuffer<T>::append(elts, nElts, cache);}
|
|
};
|
|
|
|
|
|
|
|
//
|
|
// Algorithms
|
|
//
|
|
|
|
// Assign zero to every element between first inclusive and last exclusive.
|
|
// This is equivalent ot fill(first, last, 0) but may be more efficient.
|
|
template<class For>
|
|
inline void zero(For first, For last)
|
|
{
|
|
while (first != last)
|
|
*first++ = 0;
|
|
}
|
|
|
|
|
|
// Assign zero to n elements starting at first.
|
|
// This is equivalent ot fill_n(first, n, 0) but may be more efficient.
|
|
template<class For, class Size>
|
|
inline void zero_n(For first, Size n)
|
|
{
|
|
while (n--)
|
|
*first++ = 0;
|
|
}
|
|
|
|
|
|
//
|
|
// C++ I/O
|
|
//
|
|
|
|
|
|
// A class to remember the format of an ostream so that a function may modify it internally
|
|
// without changing it for the caller.
|
|
class SaveFormat {
|
|
#ifndef __GNUC__ // The GCC libraries don't support ios_base yet.
|
|
ostream &o;
|
|
std::ios_base::fmtflags flags;
|
|
char fill;
|
|
#endif
|
|
public:
|
|
explicit SaveFormat(ostream &out);
|
|
~SaveFormat();
|
|
};
|
|
|
|
|
|
void showChar(ostream &out, char16 ch);
|
|
|
|
template<class In>
|
|
void showString(ostream &out, In begin, In end)
|
|
{
|
|
while (begin != end)
|
|
showChar(out, *begin++);
|
|
}
|
|
void showString(ostream &out, const String &str);
|
|
|
|
|
|
//
|
|
// Exceptions
|
|
//
|
|
|
|
// A JavaScript exception (other than out-of-memory, for which we use the standard C++
|
|
// exception bad_alloc).
|
|
struct Exception {
|
|
enum Kind {
|
|
SyntaxError
|
|
};
|
|
|
|
Kind kind; // The exception's kind
|
|
String message; // The detailed message
|
|
String sourceFile; // A description of the source code that caused the error
|
|
uint32 lineNum; // One-based source line number; 0 if unknown
|
|
uint32 charPos; // Zero-based character offset within the line
|
|
String sourceLine; // The text of the source line
|
|
|
|
Exception(Kind kind, const String &message): kind(kind), message(message), lineNum(0) {}
|
|
Exception(Kind kind, const String &message, const String &sourceFile, uint32 lineNum, uint32 charPos, const String sourceLine):
|
|
kind(kind), message(message), sourceFile(sourceFile), lineNum(lineNum), charPos(charPos), sourceLine(sourceLine) {}
|
|
|
|
const char *kindString() const;
|
|
String fullMessage() const;
|
|
};
|
|
}
|
|
#endif
|