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pjs/js/src/jsstr.h

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/* -*- Mode: C; tab-width: 8; 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 or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* 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.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
#ifndef jsstr_h___
#define jsstr_h___
/*
* JS string type implementation.
*
* A JS string is a counted array of unicode characters. To support handoff
* of API client memory, the chars are allocated separately from the length,
* necessitating a pointer after the count, to form a separately allocated
* string descriptor. String descriptors are GC'ed, while their chars are
* allocated from the malloc heap.
*
* When a string is treated as an object (by following it with . or []), the
* runtime wraps it with a JSObject whose valueOf method returns the unwrapped
* string descriptor.
*/
#include <ctype.h>
#include "jspubtd.h"
#include "jsprvtd.h"
#include "jshash.h"
JS_BEGIN_EXTERN_C
/*
* The original GC-thing "string" type, a flat character string owned by its
* GC-thing descriptor. The chars member points to a vector having byte size
* (length + 1) * sizeof(jschar), terminated at index length by a zero jschar.
* The terminator is purely a backstop, in case the chars pointer flows out to
* native code that requires \u0000 termination.
*
* NB: Always use the JSSTRING_LENGTH and JSSTRING_CHARS accessor macros,
* unless you guard str->member uses with !JSSTRING_IS_DEPENDENT(str).
*/
struct JSString {
size_t length;
jschar *chars;
};
/*
* Overlay structure for a string that depends on another string's characters.
* Distinguished by the JSSTRFLAG_DEPENDENT bit being set in length. The base
* member may point to another dependent string if JSSTRING_CHARS has not been
* called yet. The length chars in a dependent string are stored starting at
* base->chars + start, and are not necessarily zero-terminated. If start is
* 0, it is not stored, length is a full size_t (minus the JSSTRFLAG_* bits in
* the high two positions), and the JSSTRFLAG_PREFIX flag is set.
*/
struct JSDependentString {
size_t length;
JSString *base;
};
/* Definitions for flags stored in the high order bits of JSString.length. */
#define JSSTRFLAG_BITS 2
#define JSSTRFLAG_SHIFT(flg) ((size_t)(flg) << JSSTRING_LENGTH_BITS)
#define JSSTRFLAG_MASK JSSTRFLAG_SHIFT(JS_BITMASK(JSSTRFLAG_BITS))
#define JSSTRFLAG_DEPENDENT JSSTRFLAG_SHIFT(1)
#define JSSTRFLAG_PREFIX JSSTRFLAG_SHIFT(2)
/* Universal JSString type inquiry and accessor macros. */
#define JSSTRING_BIT(n) ((size_t)1 << (n))
#define JSSTRING_BITMASK(n) (JSSTRING_BIT(n) - 1)
#define JSSTRING_HAS_FLAG(str,flg) ((str)->length & (flg))
#define JSSTRING_IS_DEPENDENT(str) JSSTRING_HAS_FLAG(str, JSSTRFLAG_DEPENDENT)
#define JSSTRING_IS_PREFIX(str) JSSTRING_HAS_FLAG(str, JSSTRFLAG_PREFIX)
#define JSSTRING_CHARS(str) (JSSTRING_IS_DEPENDENT(str) \
? JSSTRDEP_CHARS(str) \
: (str)->chars)
#define JSSTRING_LENGTH(str) (JSSTRING_IS_DEPENDENT(str) \
? JSSTRDEP_LENGTH(str) \
: (str)->length)
#define JSSTRING_LENGTH_BITS (sizeof(size_t) * JS_BITS_PER_BYTE \
- JSSTRFLAG_BITS)
#define JSSTRING_LENGTH_MASK JSSTRING_BITMASK(JSSTRING_LENGTH_BITS)
/* Specific JSDependentString shift/mask accessor and mutator macros. */
#define JSSTRDEP_START_BITS (JSSTRING_LENGTH_BITS-JSSTRDEP_LENGTH_BITS)
#define JSSTRDEP_START_SHIFT JSSTRDEP_LENGTH_BITS
#define JSSTRDEP_START_MASK JSSTRING_BITMASK(JSSTRDEP_START_BITS)
#define JSSTRDEP_LENGTH_BITS (JSSTRING_LENGTH_BITS / 2)
#define JSSTRDEP_LENGTH_MASK JSSTRING_BITMASK(JSSTRDEP_LENGTH_BITS)
#define JSSTRDEP(str) ((JSDependentString *)(str))
#define JSSTRDEP_START(str) (JSSTRING_IS_PREFIX(str) ? 0 \
: ((JSSTRDEP(str)->length \
>> JSSTRDEP_START_SHIFT) \
& JSSTRDEP_START_MASK))
#define JSSTRDEP_LENGTH(str) (JSSTRDEP(str)->length \
& (JSSTRING_IS_PREFIX(str) \
? JSSTRING_LENGTH_MASK \
: JSSTRDEP_LENGTH_MASK))
#define JSSTRDEP_SET_START_AND_LENGTH(str,off,len) \
(JSSTRDEP(str)->length = JSSTRFLAG_DEPENDENT \
| ((off) << JSSTRDEP_START_SHIFT) \
| (len))
#define JSPREFIX_SET_LENGTH(str,len) \
(JSSTRDEP(str)->length = JSSTRFLAG_DEPENDENT | JSSTRFLAG_PREFIX | (len))
#define JSSTRDEP_BASE(str) (JSSTRDEP(str)->base)
#define JSSTRDEP_SET_BASE(str,bstr) (JSSTRDEP(str)->base = (bstr))
#define JSPREFIX_BASE(str) JSSTRDEP_BASE(str)
#define JSPREFIX_SET_BASE(str,bstr) JSSTRDEP_SET_BASE(str,bstr)
#define JSSTRDEP_CHARS(str) \
(JSSTRING_IS_DEPENDENT(JSSTRDEP_BASE(str)) \
? js_GetDependentStringChars(str) \
: JSSTRDEP_BASE(str)->chars + JSSTRDEP_START(str))
extern size_t
js_MinimizeDependentStrings(JSString *str, int level, JSString **basep);
extern jschar *
js_GetDependentStringChars(JSString *str);
extern jschar *
js_GetStringChars(JSString *str);
extern JSString *
js_ConcatStrings(JSContext *cx, JSString *left, JSString *right);
extern const jschar *
js_UndependString(JSContext *cx, JSString *str);
struct JSSubString {
size_t length;
const jschar *chars;
};
extern jschar js_empty_ucstr[];
extern JSSubString js_EmptySubString;
/* Unicode character attribute lookup tables. */
extern const uint8 js_X[];
extern const uint8 js_Y[];
extern const uint32 js_A[];
/* Enumerated Unicode general category types. */
typedef enum JSCharType {
JSCT_UNASSIGNED = 0,
JSCT_UPPERCASE_LETTER = 1,
JSCT_LOWERCASE_LETTER = 2,
JSCT_TITLECASE_LETTER = 3,
JSCT_MODIFIER_LETTER = 4,
JSCT_OTHER_LETTER = 5,
JSCT_NON_SPACING_MARK = 6,
JSCT_ENCLOSING_MARK = 7,
JSCT_COMBINING_SPACING_MARK = 8,
JSCT_DECIMAL_DIGIT_NUMBER = 9,
JSCT_LETTER_NUMBER = 10,
JSCT_OTHER_NUMBER = 11,
JSCT_SPACE_SEPARATOR = 12,
JSCT_LINE_SEPARATOR = 13,
JSCT_PARAGRAPH_SEPARATOR = 14,
JSCT_CONTROL = 15,
JSCT_FORMAT = 16,
JSCT_PRIVATE_USE = 18,
JSCT_SURROGATE = 19,
JSCT_DASH_PUNCTUATION = 20,
JSCT_START_PUNCTUATION = 21,
JSCT_END_PUNCTUATION = 22,
JSCT_CONNECTOR_PUNCTUATION = 23,
JSCT_OTHER_PUNCTUATION = 24,
JSCT_MATH_SYMBOL = 25,
JSCT_CURRENCY_SYMBOL = 26,
JSCT_MODIFIER_SYMBOL = 27,
JSCT_OTHER_SYMBOL = 28
} JSCharType;
/* Character classifying and mapping macros, based on java.lang.Character. */
#define JS_CCODE(c) (js_A[js_Y[(js_X[(uint16)(c)>>6]<<6)|((c)&0x3F)]])
#define JS_CTYPE(c) (JS_CCODE(c) & 0x1F)
#define JS_ISALPHA(c) ((((1 << JSCT_UPPERCASE_LETTER) | \
(1 << JSCT_LOWERCASE_LETTER) | \
(1 << JSCT_TITLECASE_LETTER) | \
(1 << JSCT_MODIFIER_LETTER) | \
(1 << JSCT_OTHER_LETTER)) \
>> JS_CTYPE(c)) & 1)
#define JS_ISALNUM(c) ((((1 << JSCT_UPPERCASE_LETTER) | \
(1 << JSCT_LOWERCASE_LETTER) | \
(1 << JSCT_TITLECASE_LETTER) | \
(1 << JSCT_MODIFIER_LETTER) | \
(1 << JSCT_OTHER_LETTER) | \
(1 << JSCT_DECIMAL_DIGIT_NUMBER)) \
>> JS_CTYPE(c)) & 1)
/* A unicode letter, suitable for use in an identifier. */
#define JS_ISUC_LETTER(c) ((((1 << JSCT_UPPERCASE_LETTER) | \
(1 << JSCT_LOWERCASE_LETTER) | \
(1 << JSCT_TITLECASE_LETTER) | \
(1 << JSCT_MODIFIER_LETTER) | \
(1 << JSCT_OTHER_LETTER) | \
(1 << JSCT_LETTER_NUMBER)) \
>> JS_CTYPE(c)) & 1)
/*
* 'IdentifierPart' from ECMA grammar, is Unicode letter or
* combining mark or digit or connector punctuation.
*/
#define JS_ISID_PART(c) ((((1 << JSCT_UPPERCASE_LETTER) | \
(1 << JSCT_LOWERCASE_LETTER) | \
(1 << JSCT_TITLECASE_LETTER) | \
(1 << JSCT_MODIFIER_LETTER) | \
(1 << JSCT_OTHER_LETTER) | \
(1 << JSCT_LETTER_NUMBER) | \
(1 << JSCT_NON_SPACING_MARK) | \
(1 << JSCT_COMBINING_SPACING_MARK) | \
(1 << JSCT_DECIMAL_DIGIT_NUMBER) | \
(1 << JSCT_CONNECTOR_PUNCTUATION)) \
>> JS_CTYPE(c)) & 1)
/* Unicode control-format characters, ignored in input */
#define JS_ISFORMAT(c) (((1 << JSCT_FORMAT) >> JS_CTYPE(c)) & 1)
#define JS_ISWORD(c) (JS_ISALNUM(c) || (c) == '_')
/* XXXbe unify on A/X/Y tbls, avoid ctype.h? */
#define JS_ISIDENT_START(c) (JS_ISUC_LETTER(c) || (c) == '_' || (c) == '$')
#define JS_ISIDENT(c) (JS_ISID_PART(c) || (c) == '_' || (c) == '$')
#define JS_ISDIGIT(c) (JS_CTYPE(c) == JSCT_DECIMAL_DIGIT_NUMBER)
/* XXXbe fs, etc. ? */
#define JS_ISSPACE(c) ((JS_CCODE(c) & 0x00070000) == 0x00040000)
#define JS_ISPRINT(c) ((c) < 128 && isprint(c))
#define JS_ISUPPER(c) (JS_CTYPE(c) == JSCT_UPPERCASE_LETTER)
#define JS_ISLOWER(c) (JS_CTYPE(c) == JSCT_LOWERCASE_LETTER)
#define JS_TOUPPER(c) ((JS_CCODE(c) & 0x00100000) ? (c) - ((int32)JS_CCODE(c) >> 22) : (c))
#define JS_TOLOWER(c) ((JS_CCODE(c) & 0x00200000) ? (c) + ((int32)JS_CCODE(c) >> 22) : (c))
#define JS_TOCTRL(c) ((c) ^ 64) /* XXX unsafe! requires uppercase c */
/* Shorthands for ASCII (7-bit) decimal and hex conversion. */
#define JS7_ISDEC(c) ((c) < 128 && isdigit(c))
#define JS7_UNDEC(c) ((c) - '0')
#define JS7_ISHEX(c) ((c) < 128 && isxdigit(c))
#define JS7_UNHEX(c) (uintN)(isdigit(c) ? (c) - '0' : 10 + tolower(c) - 'a')
#define JS7_ISLET(c) ((c) < 128 && isalpha(c))
/* Initialize truly global state associated with JS strings. */
extern JSBool
js_InitStringGlobals(void);
extern void
js_FreeStringGlobals(void);
extern void
js_PurgeDeflatedStringCache(JSString *str);
/* Initialize per-runtime string state for the first context in the runtime. */
extern JSBool
js_InitRuntimeStringState(JSContext *cx);
extern void
js_FinishRuntimeStringState(JSContext *cx);
/* Initialize the String class, returning its prototype object. */
extern JSObject *
js_InitStringClass(JSContext *cx, JSObject *obj);
extern const char js_escape_str[];
extern const char js_unescape_str[];
extern const char js_uneval_str[];
extern const char js_decodeURI_str[];
extern const char js_encodeURI_str[];
extern const char js_decodeURIComponent_str[];
extern const char js_encodeURIComponent_str[];
/* GC-allocate a string descriptor for the given malloc-allocated chars. */
extern JSString *
js_NewString(JSContext *cx, jschar *chars, size_t length, uintN gcflag);
extern JSString *
js_NewDependentString(JSContext *cx, JSString *base, size_t start,
size_t length, uintN gcflag);
/* Copy a counted string and GC-allocate a descriptor for it. */
extern JSString *
js_NewStringCopyN(JSContext *cx, const jschar *s, size_t n, uintN gcflag);
/* Copy a C string and GC-allocate a descriptor for it. */
extern JSString *
js_NewStringCopyZ(JSContext *cx, const jschar *s, uintN gcflag);
/* Free the chars held by str when it is finalized by the GC. */
extern void
js_FinalizeString(JSContext *cx, JSString *str);
extern void
js_FinalizeStringRT(JSRuntime *rt, JSString *str);
/* Wrap a string value in a String object. */
extern JSObject *
js_StringToObject(JSContext *cx, JSString *str);
/*
* Convert a value to a string, returning null after reporting an error,
* otherwise returning a new string reference.
*/
extern JSString *
js_ValueToString(JSContext *cx, jsval v);
/*
* Convert a value to its source expression, returning null after reporting
* an error, otherwise returning a new string reference.
*/
extern JSString *
js_ValueToSource(JSContext *cx, jsval v);
#ifdef HT_ENUMERATE_NEXT /* XXX don't require jshash.h */
/*
* Compute a hash function from str.
*/
extern JSHashNumber
js_HashString(JSString *str);
#endif
/*
* Return less than, equal to, or greater than zero depending on whether
* str1 is less than, equal to, or greater than str2.
*/
extern intN
js_CompareStrings(JSString *str1, JSString *str2);
/*
* Boyer-Moore-Horspool superlinear search for pat:patlen in text:textlen.
* The patlen argument must be positive and no greater than BMH_PATLEN_MAX.
* The start argument tells where in text to begin the search.
*
* Return the index of pat in text, or -1 if not found.
*/
#define BMH_CHARSET_SIZE 256 /* ISO-Latin-1 */
#define BMH_PATLEN_MAX 255 /* skip table element is uint8 */
#define BMH_BAD_PATTERN (-2) /* return value if pat is not ISO-Latin-1 */
extern jsint
js_BoyerMooreHorspool(const jschar *text, jsint textlen,
const jschar *pat, jsint patlen,
jsint start);
extern size_t
js_strlen(const jschar *s);
extern jschar *
js_strchr(const jschar *s, jschar c);
extern jschar *
js_strchr_limit(const jschar *s, jschar c, const jschar *limit);
#define js_strncpy(t, s, n) memcpy((t), (s), (n) * sizeof(jschar))
/*
* Return s advanced past any Unicode white space characters.
*/
extern const jschar *
js_SkipWhiteSpace(const jschar *s);
/*
* Inflate bytes to JS chars and vice versa. Report out of memory via cx
* and return null on error, otherwise return the jschar or byte vector that
* was JS_malloc'ed.
*/
extern jschar *
js_InflateString(JSContext *cx, const char *bytes, size_t length);
extern char *
js_DeflateString(JSContext *cx, const jschar *chars, size_t length);
/*
* Inflate bytes to JS chars into a buffer.
* 'chars' must be large enough for 'length'+1 jschars.
*/
extern void
js_InflateStringToBuffer(jschar *chars, const char *bytes, size_t length);
/*
* Associate bytes with str in the deflated string cache, returning true on
* successful association, false on out of memory.
*/
extern JSBool
js_SetStringBytes(JSString *str, char *bytes, size_t length);
/*
* Find or create a deflated string cache entry for str that contains its
* characters chopped from Unicode code points into bytes.
*/
extern char *
js_GetStringBytes(JSString *str);
JSBool
js_str_escape(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval);
JS_END_EXTERN_C
#endif /* jsstr_h___ */
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