mirror of
https://github.com/WinampDesktop/winamp.git
synced 2024-09-24 15:54:12 +00:00
447 lines
11 KiB
C
447 lines
11 KiB
C
/*
|
|
Expression Evaluator Library (NS-EEL) v2
|
|
Copyright (C) 2004-2013 Cockos Incorporated
|
|
Copyright (C) 1999-2003 Nullsoft, Inc.
|
|
|
|
nseel-eval.c
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include "ns-eel-int.h"
|
|
#include "wdlcstring.h"
|
|
|
|
|
|
static const char *nseel_skip_space_and_comments(const char *p, const char *endptr)
|
|
{
|
|
for (;;)
|
|
{
|
|
while (p < endptr && isspace(p[0])) p++;
|
|
if (p >= endptr-1 || *p != '/') return p;
|
|
|
|
if (p[1]=='/')
|
|
{
|
|
while (p < endptr && *p != '\r' && *p != '\n') p++;
|
|
}
|
|
else if (p[1] == '*')
|
|
{
|
|
p+=2;
|
|
while (p < endptr-1 && (p[0] != '*' || p[1] != '/')) p++;
|
|
p+=2;
|
|
if (p>=endptr) return endptr;
|
|
}
|
|
else return p;
|
|
}
|
|
}
|
|
|
|
// removes any escaped characters, also will convert pairs delim_char into single delim_chars
|
|
int nseel_filter_escaped_string(char *outbuf, int outbuf_sz, const char *rdptr, size_t rdptr_size, char delim_char)
|
|
{
|
|
int outpos = 0;
|
|
const char *rdptr_end = rdptr + rdptr_size;
|
|
while (rdptr < rdptr_end && outpos < outbuf_sz-1)
|
|
{
|
|
char thisc=*rdptr;
|
|
if (thisc == '\\' && rdptr < rdptr_end-1)
|
|
{
|
|
const char nc = rdptr[1];
|
|
if (nc == 'r' || nc == 'R') { thisc = '\r'; }
|
|
else if (nc == 'n' || nc == 'N') { thisc = '\n'; }
|
|
else if (nc == 't' || nc == 'T') { thisc = '\t'; }
|
|
else if (nc == 'b' || nc == 'B') { thisc = '\b'; }
|
|
else if ((nc >= '0' && nc <= '9') || nc == 'x' || nc == 'X')
|
|
{
|
|
unsigned char c=0;
|
|
char base_shift = 3;
|
|
char num_top = '7';
|
|
|
|
rdptr++; // skip backslash
|
|
if (nc > '9') // implies xX
|
|
{
|
|
base_shift = 4;
|
|
num_top = '9';
|
|
rdptr ++; // skip x
|
|
}
|
|
|
|
while (rdptr < rdptr_end)
|
|
{
|
|
char tc=*rdptr;
|
|
if (tc >= '0' && tc <= num_top)
|
|
{
|
|
c = (c<<base_shift) + tc - '0';
|
|
}
|
|
else if (base_shift==4)
|
|
{
|
|
if (tc >= 'a' && tc <= 'f')
|
|
{
|
|
c = (c<<base_shift) + (tc - 'a' + 10);
|
|
}
|
|
else if (tc >= 'A' && tc <= 'F')
|
|
{
|
|
c = (c<<base_shift) + (tc - 'A' + 10);
|
|
}
|
|
else break;
|
|
}
|
|
else break;
|
|
|
|
rdptr++;
|
|
}
|
|
outbuf[outpos++] = (char)c;
|
|
continue;
|
|
}
|
|
else // \c where c is an unknown character drops the backslash -- works for \, ', ", etc
|
|
{
|
|
thisc = nc;
|
|
}
|
|
rdptr+=2;
|
|
}
|
|
else
|
|
{
|
|
if (thisc == delim_char) break;
|
|
rdptr++;
|
|
}
|
|
outbuf[outpos++] = thisc;
|
|
}
|
|
outbuf[outpos]=0;
|
|
return outpos;
|
|
}
|
|
|
|
int nseel_stringsegments_tobuf(char *bufOut, int bufout_sz, struct eelStringSegmentRec *list) // call with NULL to calculate size, or non-null to generate to buffer (returning size used)
|
|
{
|
|
int pos=0;
|
|
while (list)
|
|
{
|
|
if (!bufOut)
|
|
{
|
|
pos += list->str_len;
|
|
}
|
|
else if (list->str_len > 1)
|
|
{
|
|
if (pos >= bufout_sz) break;
|
|
pos += nseel_filter_escaped_string(bufOut + pos, bufout_sz-pos, list->str_start+1, list->str_len-1, list->str_start[0]);
|
|
}
|
|
list = list->_next;
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
|
|
|
|
// state can be NULL, it will be set if finished with unterminated thing: 1 for multiline comment, ' or " for string
|
|
const char *nseel_simple_tokenizer(const char **ptr, const char *endptr, int *lenOut, int *state)
|
|
{
|
|
const char *p = *ptr;
|
|
const char *rv = p;
|
|
|
|
if (state) // if state set, returns comments as tokens
|
|
{
|
|
if (*state == 1) goto in_comment;
|
|
|
|
#ifndef NSEEL_EEL1_COMPAT_MODE
|
|
if (*state == '\'' || *state == '\"')
|
|
{
|
|
delim = (char)*state;
|
|
goto in_string;
|
|
}
|
|
#endif
|
|
|
|
// skip any whitespace
|
|
while (p < endptr && isspace(p[0])) p++;
|
|
}
|
|
else
|
|
{
|
|
// state not passed, skip comments (do not return them as tokens)
|
|
p = nseel_skip_space_and_comments(p,endptr);
|
|
}
|
|
|
|
if (p >= endptr)
|
|
{
|
|
*ptr = endptr;
|
|
*lenOut = 0;
|
|
return NULL;
|
|
}
|
|
|
|
rv=p;
|
|
|
|
if (*p == '$' && p+3 < endptr && p[1] == '\'' && p[3] == '\'')
|
|
{
|
|
p+=4;
|
|
}
|
|
else if (state && *p == '/' && p < endptr-1 && (p[1] == '/' || p[1] == '*'))
|
|
{
|
|
if (p[1] == '/')
|
|
{
|
|
while (p < endptr && *p != '\r' && *p != '\n') p++; // advance to end of line
|
|
}
|
|
else
|
|
{
|
|
if (state) *state=1;
|
|
p+=2;
|
|
in_comment:
|
|
while (p < endptr)
|
|
{
|
|
const char c = *p++;
|
|
if (c == '*' && p < endptr && *p == '/')
|
|
{
|
|
p++;
|
|
if (state) *state=0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
else if (isalnum(*p) || *p == '_' || *p == '#' || *p == '$')
|
|
{
|
|
if (*p == '$' && p < endptr-1 && p[1] == '~') p++;
|
|
p++;
|
|
while (p < endptr && (isalnum(*p) || *p == '_' || *p == '.')) p++;
|
|
}
|
|
#ifndef NSEEL_EEL1_COMPAT_MODE
|
|
else if (*p == '\'' || *p == '\"')
|
|
{
|
|
delim = *p++;
|
|
if (state) *state=delim;
|
|
in_string:
|
|
|
|
while (p < endptr)
|
|
{
|
|
const char c = *p++;
|
|
if (p < endptr && c == '\\') p++; // skip escaped characters
|
|
else if (c == delim)
|
|
{
|
|
if (state) *state=0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
else
|
|
{
|
|
p++;
|
|
}
|
|
*ptr = p;
|
|
*lenOut = (int) (p - rv);
|
|
return p>rv ? rv : NULL;
|
|
}
|
|
|
|
|
|
|
|
#ifdef NSEEL_SUPER_MINIMAL_LEXER
|
|
|
|
int nseellex(opcodeRec **output, YYLTYPE * yylloc_param, compileContext *scctx)
|
|
{
|
|
int rv=0,toklen=0;
|
|
const char *rdptr = scctx->rdbuf;
|
|
const char *endptr = scctx->rdbuf_end;
|
|
const char *tok = nseel_simple_tokenizer(&rdptr,endptr,&toklen,NULL);
|
|
*output = 0;
|
|
if (tok)
|
|
{
|
|
rv = tok[0];
|
|
if (rv == '$')
|
|
{
|
|
if (rdptr != tok+1)
|
|
{
|
|
*output = nseel_translate(scctx,tok,rdptr-tok);
|
|
if (*output) rv=VALUE;
|
|
}
|
|
}
|
|
#ifndef NSEEL_EEL1_COMPAT_MODE
|
|
else if (rv == '#' && scctx->onNamedString)
|
|
{
|
|
*output = nseel_translate(scctx,tok,rdptr-tok);
|
|
if (*output) rv=STRING_IDENTIFIER;
|
|
}
|
|
else if (rv == '\'')
|
|
{
|
|
if (toklen > 1 && tok[toklen-1] == '\'')
|
|
{
|
|
*output = nseel_translate(scctx, tok, toklen);
|
|
if (*output) rv = VALUE;
|
|
}
|
|
else scctx->gotEndOfInput|=8;
|
|
}
|
|
else if (rv == '\"' && scctx->onString)
|
|
{
|
|
if (toklen > 1 && tok[toklen-1] == '\"')
|
|
{
|
|
*output = (opcodeRec *)nseel_createStringSegmentRec(scctx,tok,toklen);
|
|
if (*output) rv = STRING_LITERAL;
|
|
}
|
|
else scctx->gotEndOfInput|=16;
|
|
}
|
|
#endif
|
|
else if (isalpha(rv) || rv == '_')
|
|
{
|
|
// toklen already valid
|
|
char buf[NSEEL_MAX_VARIABLE_NAMELEN*2];
|
|
if (toklen > sizeof(buf) - 1) toklen=sizeof(buf) - 1;
|
|
memcpy(buf,tok,toklen);
|
|
buf[toklen]=0;
|
|
*output = nseel_createCompiledValuePtr(scctx, NULL, buf);
|
|
if (*output) rv = IDENTIFIER;
|
|
}
|
|
else if ((rv >= '0' && rv <= '9') || (rv == '.' && (rdptr < endptr && rdptr[0] >= '0' && rdptr[0] <= '9')))
|
|
{
|
|
if (rv == '0' && rdptr < endptr && (rdptr[0] == 'x' || rdptr[0] == 'X'))
|
|
{
|
|
rdptr++;
|
|
while (rdptr < endptr && (rv=rdptr[0]) && ((rv>='0' && rv<='9') || (rv>='a' && rv<='f') || (rv>='A' && rv<='F'))) rdptr++;
|
|
}
|
|
else
|
|
{
|
|
int pcnt=rv == '.';
|
|
while (rdptr < endptr && (rv=rdptr[0]) && ((rv>='0' && rv<='9') || (rv == '.' && !pcnt++))) rdptr++;
|
|
}
|
|
*output = nseel_translate(scctx,tok,rdptr-tok);
|
|
if (*output) rv=VALUE;
|
|
}
|
|
else if (rv == '<')
|
|
{
|
|
const char nc=*rdptr;
|
|
if (nc == '<')
|
|
{
|
|
rdptr++;
|
|
rv=TOKEN_SHL;
|
|
}
|
|
else if (nc == '=')
|
|
{
|
|
rdptr++;
|
|
rv=TOKEN_LTE;
|
|
}
|
|
}
|
|
else if (rv == '>')
|
|
{
|
|
const char nc=*rdptr;
|
|
if (nc == '>')
|
|
{
|
|
rdptr++;
|
|
rv=TOKEN_SHR;
|
|
}
|
|
else if (nc == '=')
|
|
{
|
|
rdptr++;
|
|
rv=TOKEN_GTE;
|
|
}
|
|
}
|
|
else if (rv == '&' && *rdptr == '&')
|
|
{
|
|
rdptr++;
|
|
rv = TOKEN_LOGICAL_AND;
|
|
}
|
|
else if (rv == '|' && *rdptr == '|')
|
|
{
|
|
rdptr++;
|
|
rv = TOKEN_LOGICAL_OR;
|
|
}
|
|
else if (*rdptr == '=')
|
|
{
|
|
switch (rv)
|
|
{
|
|
case '+': rv=TOKEN_ADD_OP; rdptr++; break;
|
|
case '-': rv=TOKEN_SUB_OP; rdptr++; break;
|
|
case '%': rv=TOKEN_MOD_OP; rdptr++; break;
|
|
case '|': rv=TOKEN_OR_OP; rdptr++; break;
|
|
case '&': rv=TOKEN_AND_OP; rdptr++; break;
|
|
case '~': rv=TOKEN_XOR_OP; rdptr++; break;
|
|
case '/': rv=TOKEN_DIV_OP; rdptr++; break;
|
|
case '*': rv=TOKEN_MUL_OP; rdptr++; break;
|
|
case '^': rv=TOKEN_POW_OP; rdptr++; break;
|
|
case '!':
|
|
rdptr++;
|
|
if (rdptr < endptr && *rdptr == '=')
|
|
{
|
|
rdptr++;
|
|
rv=TOKEN_NE_EXACT;
|
|
}
|
|
else
|
|
rv=TOKEN_NE;
|
|
break;
|
|
case '=':
|
|
rdptr++;
|
|
if (rdptr < endptr && *rdptr == '=')
|
|
{
|
|
rdptr++;
|
|
rv=TOKEN_EQ_EXACT;
|
|
}
|
|
else
|
|
rv=TOKEN_EQ;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
scctx->rdbuf = rdptr;
|
|
yylloc_param->first_column = (int)(tok - scctx->rdbuf_start);
|
|
return rv;
|
|
}
|
|
|
|
|
|
void nseelerror(YYLTYPE *pos,compileContext *ctx, const char *str)
|
|
{
|
|
ctx->errVar=pos->first_column>0?pos->first_column:(int)(ctx->rdbuf_end - ctx->rdbuf_start);
|
|
}
|
|
|
|
|
|
#else
|
|
|
|
int nseel_gets(compileContext *ctx, char *buf, size_t sz)
|
|
{
|
|
int n=0;
|
|
const char *endptr = ctx->rdbuf_end;
|
|
const char *rdptr = ctx->rdbuf;
|
|
if (!rdptr) return 0;
|
|
|
|
while (n < sz && rdptr < endptr) buf[n++] = *rdptr++;
|
|
ctx->rdbuf=rdptr;
|
|
return n;
|
|
|
|
}
|
|
|
|
|
|
//#define EEL_TRACE_LEX
|
|
|
|
#ifdef EEL_TRACE_LEX
|
|
#define nseellex nseellex2
|
|
|
|
#endif
|
|
#include "lex.nseel.c"
|
|
|
|
#ifdef EEL_TRACE_LEX
|
|
|
|
#undef nseellex
|
|
|
|
int nseellex(YYSTYPE * yylval_param, YYLTYPE * yylloc_param , yyscan_t yyscanner)
|
|
{
|
|
int a=nseellex2(yylval_param,yylloc_param,yyscanner);
|
|
|
|
char buf[512];
|
|
sprintf(buf,"tok: %c (%d)\n",a,a);
|
|
OutputDebugString(buf);
|
|
return a;
|
|
}
|
|
#endif//EEL_TRACE_LEX
|
|
|
|
|
|
void nseelerror(YYLTYPE *pos,compileContext *ctx, const char *str)
|
|
{
|
|
ctx->errVar=pos->first_column>0?pos->first_column:(int)(ctx->rdbuf_end - ctx->rdbuf_start);
|
|
}
|
|
#endif // !NSEEL_SUPER_MINIMAL_LEXER
|