mirror of
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614 lines
20 KiB
C++
614 lines
20 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "prefread.h"
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#include "nsString.h"
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#include "nsUTF8Utils.h"
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#ifdef TEST_PREFREAD
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#include <stdio.h>
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#define NS_WARNING(_s) printf(">>> " _s "!\n")
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#define NS_NOTREACHED(_s) NS_WARNING(_s)
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#else
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#include "nsDebug.h" // for NS_WARNING
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#endif
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/* pref parser states */
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enum {
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PREF_PARSE_INIT,
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PREF_PARSE_MATCH_STRING,
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PREF_PARSE_UNTIL_NAME,
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PREF_PARSE_QUOTED_STRING,
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PREF_PARSE_UNTIL_COMMA,
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PREF_PARSE_UNTIL_VALUE,
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PREF_PARSE_INT_VALUE,
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PREF_PARSE_COMMENT_MAYBE_START,
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PREF_PARSE_COMMENT_BLOCK,
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PREF_PARSE_COMMENT_BLOCK_MAYBE_END,
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PREF_PARSE_ESC_SEQUENCE,
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PREF_PARSE_HEX_ESCAPE,
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PREF_PARSE_UTF16_LOW_SURROGATE,
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PREF_PARSE_UNTIL_OPEN_PAREN,
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PREF_PARSE_UNTIL_CLOSE_PAREN,
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PREF_PARSE_UNTIL_SEMICOLON,
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PREF_PARSE_UNTIL_EOL
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};
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#define UTF16_ESC_NUM_DIGITS 4
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#define HEX_ESC_NUM_DIGITS 2
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#define BITS_PER_HEX_DIGIT 4
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static const char kUserPref[] = "user_pref";
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static const char kPref[] = "pref";
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static const char kPrefSticky[] = "sticky_pref";
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static const char kTrue[] = "true";
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static const char kFalse[] = "false";
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/**
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* pref_GrowBuf
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*
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* this function will increase the size of the buffer owned
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* by the given pref parse state. We currently use a simple
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* doubling algorithm, but the only hard requirement is that
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* it increase the buffer by at least the size of the ps->esctmp
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* buffer used for escape processing (currently 6 bytes).
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*
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* this buffer is used to store partial pref lines. it is
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* freed when the parse state is destroyed.
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*
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* @param ps
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* parse state instance
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*
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* this function updates all pointers that reference an
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* address within lb since realloc may relocate the buffer.
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*
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* @return false if insufficient memory.
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*/
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static bool
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pref_GrowBuf(PrefParseState *ps)
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{
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int bufLen, curPos, valPos;
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bufLen = ps->lbend - ps->lb;
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curPos = ps->lbcur - ps->lb;
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valPos = ps->vb - ps->lb;
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if (bufLen == 0)
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bufLen = 128; /* default buffer size */
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else
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bufLen <<= 1; /* double buffer size */
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#ifdef TEST_PREFREAD
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fprintf(stderr, ">>> realloc(%d)\n", bufLen);
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#endif
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ps->lb = (char*) realloc(ps->lb, bufLen);
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if (!ps->lb)
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return false;
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ps->lbcur = ps->lb + curPos;
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ps->lbend = ps->lb + bufLen;
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ps->vb = ps->lb + valPos;
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return true;
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}
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/**
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* pref_DoCallback
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*
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* this function is called when a complete pref name-value pair has
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* been extracted from the input data.
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*
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* @param ps
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* parse state instance
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*
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* @return false to indicate a fatal error.
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*/
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static bool
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pref_DoCallback(PrefParseState *ps)
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{
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PrefValue value;
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switch (ps->vtype) {
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case PREF_STRING:
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value.stringVal = ps->vb;
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break;
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case PREF_INT:
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if ((ps->vb[0] == '-' || ps->vb[0] == '+') && ps->vb[1] == '\0') {
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NS_WARNING("malformed integer value");
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return false;
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}
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value.intVal = atoi(ps->vb);
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break;
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case PREF_BOOL:
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value.boolVal = (ps->vb == kTrue);
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break;
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default:
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break;
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}
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(*ps->reader)(ps->closure, ps->lb, value, ps->vtype, ps->fdefault,
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ps->fstickydefault);
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return true;
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}
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void
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PREF_InitParseState(PrefParseState *ps, PrefReader reader, void *closure)
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{
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memset(ps, 0, sizeof(*ps));
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ps->reader = reader;
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ps->closure = closure;
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}
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void
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PREF_FinalizeParseState(PrefParseState *ps)
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{
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if (ps->lb)
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free(ps->lb);
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}
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/**
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* Pseudo-BNF
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* ----------
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* function = LJUNK function-name JUNK function-args
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* function-name = "user_pref" | "pref"
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* function-args = "(" JUNK pref-name JUNK "," JUNK pref-value JUNK ")" JUNK ";"
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* pref-name = quoted-string
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* pref-value = quoted-string | "true" | "false" | integer-value
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* JUNK = *(WS | comment-block | comment-line)
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* LJUNK = *(WS | comment-block | comment-line | bcomment-line)
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* WS = SP | HT | LF | VT | FF | CR
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* SP = <US-ASCII SP, space (32)>
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* HT = <US-ASCII HT, horizontal-tab (9)>
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* LF = <US-ASCII LF, linefeed (10)>
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* VT = <US-ASCII HT, vertical-tab (11)>
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* FF = <US-ASCII FF, form-feed (12)>
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* CR = <US-ASCII CR, carriage return (13)>
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* comment-block = <C/C++ style comment block>
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* comment-line = <C++ style comment line>
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* bcomment-line = <bourne-shell style comment line>
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*/
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bool
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PREF_ParseBuf(PrefParseState *ps, const char *buf, int bufLen)
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{
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const char *end;
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char c;
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char udigit;
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int state;
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state = ps->state;
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for (end = buf + bufLen; buf != end; ++buf) {
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c = *buf;
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switch (state) {
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/* initial state */
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case PREF_PARSE_INIT:
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if (ps->lbcur != ps->lb) { /* reset state */
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ps->lbcur = ps->lb;
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ps->vb = nullptr;
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ps->vtype = PREF_INVALID;
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ps->fdefault = false;
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ps->fstickydefault = false;
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}
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switch (c) {
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case '/': /* begin comment block or line? */
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state = PREF_PARSE_COMMENT_MAYBE_START;
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break;
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case '#': /* accept shell style comments */
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state = PREF_PARSE_UNTIL_EOL;
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break;
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case 'u': /* indicating user_pref */
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case 'p': /* indicating pref */
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case 's': /* indicating sticky_pref */
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ps->smatch = (c == 'u' ? kUserPref :
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(c == 's' ? kPrefSticky : kPref));
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ps->sindex = 1;
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ps->nextstate = PREF_PARSE_UNTIL_OPEN_PAREN;
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state = PREF_PARSE_MATCH_STRING;
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break;
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/* else skip char */
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}
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break;
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/* string matching */
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case PREF_PARSE_MATCH_STRING:
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if (c == ps->smatch[ps->sindex++]) {
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/* if we've matched all characters, then move to next state. */
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if (ps->smatch[ps->sindex] == '\0') {
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state = ps->nextstate;
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ps->nextstate = PREF_PARSE_INIT; /* reset next state */
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}
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/* else wait for next char */
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}
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else {
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NS_WARNING("malformed pref file");
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return false;
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}
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break;
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/* quoted string parsing */
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case PREF_PARSE_QUOTED_STRING:
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/* we assume that the initial quote has already been consumed */
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if (ps->lbcur == ps->lbend && !pref_GrowBuf(ps))
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return false; /* out of memory */
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if (c == '\\')
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state = PREF_PARSE_ESC_SEQUENCE;
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else if (c == ps->quotechar) {
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*ps->lbcur++ = '\0';
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state = ps->nextstate;
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ps->nextstate = PREF_PARSE_INIT; /* reset next state */
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}
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else
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*ps->lbcur++ = c;
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break;
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/* name parsing */
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case PREF_PARSE_UNTIL_NAME:
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if (c == '\"' || c == '\'') {
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ps->fdefault = (ps->smatch == kPref || ps->smatch == kPrefSticky);
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ps->fstickydefault = (ps->smatch == kPrefSticky);
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ps->quotechar = c;
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ps->nextstate = PREF_PARSE_UNTIL_COMMA; /* return here when done */
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state = PREF_PARSE_QUOTED_STRING;
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}
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else if (c == '/') { /* allow embedded comment */
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ps->nextstate = state; /* return here when done with comment */
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state = PREF_PARSE_COMMENT_MAYBE_START;
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}
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else if (!isspace(c)) {
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NS_WARNING("malformed pref file");
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return false;
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}
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break;
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/* parse until we find a comma separating name and value */
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case PREF_PARSE_UNTIL_COMMA:
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if (c == ',') {
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ps->vb = ps->lbcur;
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state = PREF_PARSE_UNTIL_VALUE;
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}
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else if (c == '/') { /* allow embedded comment */
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ps->nextstate = state; /* return here when done with comment */
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state = PREF_PARSE_COMMENT_MAYBE_START;
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}
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else if (!isspace(c)) {
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NS_WARNING("malformed pref file");
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return false;
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}
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break;
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/* value parsing */
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case PREF_PARSE_UNTIL_VALUE:
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/* the pref value type is unknown. so, we scan for the first
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* character of the value, and determine the type from that. */
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if (c == '\"' || c == '\'') {
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ps->vtype = PREF_STRING;
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ps->quotechar = c;
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ps->nextstate = PREF_PARSE_UNTIL_CLOSE_PAREN;
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state = PREF_PARSE_QUOTED_STRING;
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}
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else if (c == 't' || c == 'f') {
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ps->vb = (char *) (c == 't' ? kTrue : kFalse);
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ps->vtype = PREF_BOOL;
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ps->smatch = ps->vb;
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ps->sindex = 1;
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ps->nextstate = PREF_PARSE_UNTIL_CLOSE_PAREN;
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state = PREF_PARSE_MATCH_STRING;
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}
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else if (isdigit(c) || (c == '-') || (c == '+')) {
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ps->vtype = PREF_INT;
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/* write c to line buffer... */
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if (ps->lbcur == ps->lbend && !pref_GrowBuf(ps))
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return false; /* out of memory */
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*ps->lbcur++ = c;
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state = PREF_PARSE_INT_VALUE;
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}
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else if (c == '/') { /* allow embedded comment */
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ps->nextstate = state; /* return here when done with comment */
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state = PREF_PARSE_COMMENT_MAYBE_START;
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}
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else if (!isspace(c)) {
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NS_WARNING("malformed pref file");
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return false;
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}
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break;
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case PREF_PARSE_INT_VALUE:
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/* grow line buffer if necessary... */
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if (ps->lbcur == ps->lbend && !pref_GrowBuf(ps))
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return false; /* out of memory */
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if (isdigit(c))
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*ps->lbcur++ = c;
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else {
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*ps->lbcur++ = '\0'; /* stomp null terminator; we are done. */
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if (c == ')')
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state = PREF_PARSE_UNTIL_SEMICOLON;
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else if (c == '/') { /* allow embedded comment */
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ps->nextstate = PREF_PARSE_UNTIL_CLOSE_PAREN;
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state = PREF_PARSE_COMMENT_MAYBE_START;
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}
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else if (isspace(c))
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state = PREF_PARSE_UNTIL_CLOSE_PAREN;
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else {
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NS_WARNING("malformed pref file");
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return false;
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}
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}
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break;
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/* comment parsing */
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case PREF_PARSE_COMMENT_MAYBE_START:
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switch (c) {
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case '*': /* comment block */
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state = PREF_PARSE_COMMENT_BLOCK;
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break;
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case '/': /* comment line */
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state = PREF_PARSE_UNTIL_EOL;
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break;
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default:
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/* pref file is malformed */
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NS_WARNING("malformed pref file");
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return false;
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}
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break;
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case PREF_PARSE_COMMENT_BLOCK:
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if (c == '*')
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state = PREF_PARSE_COMMENT_BLOCK_MAYBE_END;
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break;
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case PREF_PARSE_COMMENT_BLOCK_MAYBE_END:
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switch (c) {
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case '/':
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state = ps->nextstate;
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ps->nextstate = PREF_PARSE_INIT;
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break;
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case '*': /* stay in this state */
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break;
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default:
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state = PREF_PARSE_COMMENT_BLOCK;
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}
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break;
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/* string escape sequence parsing */
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case PREF_PARSE_ESC_SEQUENCE:
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/* not necessary to resize buffer here since we should be writing
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* only one character and the resize check would have been done
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* for us in the previous state */
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switch (c) {
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case '\"':
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case '\'':
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case '\\':
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break;
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case 'r':
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c = '\r';
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break;
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case 'n':
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c = '\n';
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break;
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case 'x': /* hex escape -- always interpreted as Latin-1 */
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case 'u': /* UTF16 escape */
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ps->esctmp[0] = c;
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ps->esclen = 1;
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ps->utf16[0] = ps->utf16[1] = 0;
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ps->sindex = (c == 'x' ) ?
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HEX_ESC_NUM_DIGITS :
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UTF16_ESC_NUM_DIGITS;
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state = PREF_PARSE_HEX_ESCAPE;
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continue;
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default:
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NS_WARNING("preserving unexpected JS escape sequence");
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/* Invalid escape sequence so we do have to write more than
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* one character. Grow line buffer if necessary... */
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if ((ps->lbcur+1) == ps->lbend && !pref_GrowBuf(ps))
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return false; /* out of memory */
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*ps->lbcur++ = '\\'; /* preserve the escape sequence */
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break;
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}
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*ps->lbcur++ = c;
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state = PREF_PARSE_QUOTED_STRING;
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break;
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/* parsing a hex (\xHH) or utf16 escape (\uHHHH) */
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case PREF_PARSE_HEX_ESCAPE:
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if ( c >= '0' && c <= '9' )
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udigit = (c - '0');
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else if ( c >= 'A' && c <= 'F' )
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udigit = (c - 'A') + 10;
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else if ( c >= 'a' && c <= 'f' )
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udigit = (c - 'a') + 10;
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else {
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/* bad escape sequence found, write out broken escape as-is */
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NS_WARNING("preserving invalid or incomplete hex escape");
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*ps->lbcur++ = '\\'; /* original escape slash */
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if ((ps->lbcur + ps->esclen) >= ps->lbend && !pref_GrowBuf(ps))
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return false;
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for (int i = 0; i < ps->esclen; ++i)
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*ps->lbcur++ = ps->esctmp[i];
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/* push the non-hex character back for re-parsing. */
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/* (++buf at the top of the loop keeps this safe) */
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--buf;
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state = PREF_PARSE_QUOTED_STRING;
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continue;
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}
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/* have a digit */
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ps->esctmp[ps->esclen++] = c; /* preserve it */
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ps->utf16[1] <<= BITS_PER_HEX_DIGIT;
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ps->utf16[1] |= udigit;
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ps->sindex--;
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if (ps->sindex == 0) {
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/* have the full escape. Convert to UTF8 */
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int utf16len = 0;
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if (ps->utf16[0]) {
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/* already have a high surrogate, this is a two char seq */
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utf16len = 2;
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}
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else if (0xD800 == (0xFC00 & ps->utf16[1])) {
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/* a high surrogate, can't convert until we have the low */
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ps->utf16[0] = ps->utf16[1];
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ps->utf16[1] = 0;
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state = PREF_PARSE_UTF16_LOW_SURROGATE;
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break;
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}
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else {
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/* a single utf16 character */
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ps->utf16[0] = ps->utf16[1];
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utf16len = 1;
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}
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/* actual conversion */
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/* make sure there's room, 6 bytes is max utf8 len (in */
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/* theory; 4 bytes covers the actual utf16 range) */
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if (ps->lbcur+6 >= ps->lbend && !pref_GrowBuf(ps))
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return false;
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ConvertUTF16toUTF8 converter(ps->lbcur);
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converter.write(ps->utf16, utf16len);
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ps->lbcur += converter.Size();
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state = PREF_PARSE_QUOTED_STRING;
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}
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break;
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/* looking for beginning of utf16 low surrogate */
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case PREF_PARSE_UTF16_LOW_SURROGATE:
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if (ps->sindex == 0 && c == '\\') {
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++ps->sindex;
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}
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else if (ps->sindex == 1 && c == 'u') {
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/* escape sequence is correct, now parse hex */
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ps->sindex = UTF16_ESC_NUM_DIGITS;
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ps->esctmp[0] = 'u';
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ps->esclen = 1;
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state = PREF_PARSE_HEX_ESCAPE;
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}
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else {
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/* didn't find expected low surrogate. Ignore high surrogate
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* (it would just get converted to nothing anyway) and start
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* over with this character */
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--buf;
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if (ps->sindex == 1)
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state = PREF_PARSE_ESC_SEQUENCE;
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else
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state = PREF_PARSE_QUOTED_STRING;
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continue;
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}
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break;
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|
|
|
/* function open and close parsing */
|
|
case PREF_PARSE_UNTIL_OPEN_PAREN:
|
|
/* tolerate only whitespace and embedded comments */
|
|
if (c == '(')
|
|
state = PREF_PARSE_UNTIL_NAME;
|
|
else if (c == '/') {
|
|
ps->nextstate = state; /* return here when done with comment */
|
|
state = PREF_PARSE_COMMENT_MAYBE_START;
|
|
}
|
|
else if (!isspace(c)) {
|
|
NS_WARNING("malformed pref file");
|
|
return false;
|
|
}
|
|
break;
|
|
case PREF_PARSE_UNTIL_CLOSE_PAREN:
|
|
/* tolerate only whitespace and embedded comments */
|
|
if (c == ')')
|
|
state = PREF_PARSE_UNTIL_SEMICOLON;
|
|
else if (c == '/') {
|
|
ps->nextstate = state; /* return here when done with comment */
|
|
state = PREF_PARSE_COMMENT_MAYBE_START;
|
|
}
|
|
else if (!isspace(c)) {
|
|
NS_WARNING("malformed pref file");
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
/* function terminator ';' parsing */
|
|
case PREF_PARSE_UNTIL_SEMICOLON:
|
|
/* tolerate only whitespace and embedded comments */
|
|
if (c == ';') {
|
|
if (!pref_DoCallback(ps))
|
|
return false;
|
|
state = PREF_PARSE_INIT;
|
|
}
|
|
else if (c == '/') {
|
|
ps->nextstate = state; /* return here when done with comment */
|
|
state = PREF_PARSE_COMMENT_MAYBE_START;
|
|
}
|
|
else if (!isspace(c)) {
|
|
NS_WARNING("malformed pref file");
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
/* eol parsing */
|
|
case PREF_PARSE_UNTIL_EOL:
|
|
/* need to handle mac, unix, or dos line endings.
|
|
* PREF_PARSE_INIT will eat the next \n in case
|
|
* we have \r\n. */
|
|
if (c == '\r' || c == '\n' || c == 0x1A) {
|
|
state = ps->nextstate;
|
|
ps->nextstate = PREF_PARSE_INIT; /* reset next state */
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
ps->state = state;
|
|
return true;
|
|
}
|
|
|
|
#ifdef TEST_PREFREAD
|
|
|
|
static void
|
|
pref_reader(void *closure,
|
|
const char *pref,
|
|
PrefValue val,
|
|
PrefType type,
|
|
bool defPref)
|
|
{
|
|
printf("%spref(\"%s\", ", defPref ? "" : "user_", pref);
|
|
switch (type) {
|
|
case PREF_STRING:
|
|
printf("\"%s\");\n", val.stringVal);
|
|
break;
|
|
case PREF_INT:
|
|
printf("%i);\n", val.intVal);
|
|
break;
|
|
case PREF_BOOL:
|
|
printf("%s);\n", val.boolVal == false ? "false" : "true");
|
|
break;
|
|
}
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
PrefParseState ps;
|
|
char buf[4096]; /* i/o buffer */
|
|
FILE *fp;
|
|
int n;
|
|
|
|
if (argc == 1) {
|
|
printf("usage: prefread file.js\n");
|
|
return -1;
|
|
}
|
|
|
|
fp = fopen(argv[1], "r");
|
|
if (!fp) {
|
|
printf("failed to open file\n");
|
|
return -1;
|
|
}
|
|
|
|
PREF_InitParseState(&ps, pref_reader, nullptr);
|
|
|
|
while ((n = fread(buf, 1, sizeof(buf), fp)) > 0)
|
|
PREF_ParseBuf(&ps, buf, n);
|
|
|
|
PREF_FinalizeParseState(&ps);
|
|
|
|
fclose(fp);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* TEST_PREFREAD */
|