lex.c

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#include <string.h>
#include <stdlib.h>

#include "eval.h"
#include "evaltype.h"
#include "evalparse.h"

static int lex_pos;

static int char2int(char a, int base)
{
	int i;
	if ((a>='A') && (a<='Z')) {
		i=a-'A'+10;
	} else if ((a>='a') && (a<='z')) {
		i=a-'a'+10;
	} else if ((a>='0') && (a<='9')) {
		i=a-'0';
	} else return -1;
	if (i>=base) return -1;
	return i;
}

static int parse_float(eval_scalar *f, char *fpn)
{
	char *end;
	double d;
	d=strtod(fpn, &end);
	if (*end == 0) {
        	f->type=SCALAR_FLOAT;
        	f->scalar.floatnum.value=d;
		return 1;
	}
	return 0;
}

static int parse_integer(eval_scalar *i, char *num, int base, int lenmod)
{
	uint64 k = 0;
	int l = strlen(num) + lenmod;
	while (l--) {
		int c=char2int(*num, base);
		if (c==-1) return 0;
		k *= base;
		k += c;
		num++;
	}
	i->type=SCALAR_INT;
	i->scalar.integer.value=k;
	i->scalar.integer.type=TYPE_UNKNOWN;
	return 1;
}

static int parse_cstring(eval_scalar *r, char *s, int len)
{
	char *result;

	int alloclen = len;
	if (alloclen < 1) alloclen = 1;

	r->type = SCALAR_STR;
	r->scalar.str.value = (char*)malloc(alloclen);
	if (!r->scalar.str.value) return 0;

	result = r->scalar.str.value;

	// may not end with '\\'
	if (len && s[len-1] == '\\') return 0;

	while (s && *s && len) {
		if (*s == '\\') {
			s++;len--;if (!len) break;
			switch (*s) {
				case '0':
					*result++='\0';
					break;
				case 'a':
					*result++='\a';
					break;
				case 'b':
					*result++='\b';
					break;
				case 'e':
					*result++='\e';
					break;
				case 'f':
					*result++='\f';
					break;
				case 'n':
					*result++='\n';
					break;
				case 'r':
					*result++='\r';
					break;
				case 't':
					*result++='\t';
					break;
				case 'v':
					*result++='\v';
					break;
				case '\"':
					*result++='"';
					break;
				case '\\':
					*result++='\\';
					break;
				case 'x': {
					int p, q;
					s++;len--;if (!len) break;
					p=char2int(*s, 16);
					if (p==-1)  return 0;
					s++;len--;if (!len) break;
					q=char2int(*s, 16);
					if (q==-1) return 0;
					*result++=(char)p*16+q;
					break;
				}
				default:
					*result++='\\';
					if (len) *result++=*s;
					break;
			}
		} else {
			*result++ = *s;
		}
		s++;len--;
	}
	
	r->scalar.str.len=result-r->scalar.str.value;
	
	return 1;
}

static int parse_pstring(eval_scalar *s, char *cstr, int len)
{
	int alloclen=len;
	if (!len) alloclen=1;
	
	s->type=SCALAR_STR;
	s->scalar.str.value=(char*)malloc(alloclen);
	memcpy(s->scalar.str.value, cstr, len);
	s->scalar.str.len=len;
	return 1;
}

void *lex_current_buffer()
{
	return (void*)YY_CURRENT_BUFFER;
}

int lex_current_buffer_pos()
{
	return lex_pos;
}

void lex_switch_buffer(void *buffer)
{
	yy_switch_to_buffer(buffer);	
}

void lex_delete_buffer(void *buffer)
{
	yy_delete_buffer(buffer);	
}

void *lex_scan_string_buffer(const char *str)
{
	return yy_scan_string(str);
}

/*
*/
#line 700 "lex.c"

#define INITIAL 0

#ifndef YY_NO_UNISTD_H
/* Special case for "unistd.h", since it is non-ANSI. We include it way
 * down here because we want the user's section 1 to have been scanned first.
 * The user has a chance to override it with an option.
 */
#include <unistd.h>
#endif

#ifndef YY_EXTRA_TYPE
#define YY_EXTRA_TYPE void *
#endif

static int yy_init_globals (void );

/* Macros after this point can all be overridden by user definitions in
 * section 1.
 */

#ifndef YY_SKIP_YYWRAP
#ifdef __cplusplus
extern "C" int yywrap (void );
#else
extern int yywrap (void );
#endif
#endif

    static void yyunput (int c,char *buf_ptr  );
    
#ifndef yytext_ptr
static void yy_flex_strncpy (char *,yyconst char *,int );
#endif

#ifdef YY_NEED_STRLEN
static int yy_flex_strlen (yyconst char * );
#endif

#ifndef YY_NO_INPUT

#ifdef __cplusplus
static int yyinput (void );
#else
static int input (void );
#endif

#endif

/* Amount of stuff to slurp up with each read. */
#ifndef YY_READ_BUF_SIZE
#define YY_READ_BUF_SIZE 8192
#endif

/* Copy whatever the last rule matched to the standard output. */
#ifndef ECHO
/* This used to be an fputs(), but since the string might contain NUL's,
 * we now use fwrite().
 */
#define ECHO (void) fwrite( yytext, yyleng, 1, yyout )
#endif

/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
 * is returned in "result".
 */
#ifndef YY_INPUT
#define YY_INPUT(buf,result,max_size) \
	if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
		{ \
		int c = '*'; \
		size_t n; \
		for ( n = 0; n < max_size && \
			     (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
			buf[n] = (char) c; \
		if ( c == '\n' ) \
			buf[n++] = (char) c; \
		if ( c == EOF && ferror( yyin ) ) \
			YY_FATAL_ERROR( "input in flex scanner failed" ); \
		result = n; \
		} \
	else \
		{ \
		errno=0; \
		while ( (result = fread(buf, 1, max_size, yyin))==0 && ferror(yyin)) \
			{ \
			if( errno != EINTR) \
				{ \
				YY_FATAL_ERROR( "input in flex scanner failed" ); \
				break; \
				} \
			errno=0; \
			clearerr(yyin); \
			} \
		}\
\

#endif

/* No semi-colon after return; correct usage is to write "yyterminate();" -
 * we don't want an extra ';' after the "return" because that will cause
 * some compilers to complain about unreachable statements.
 */
#ifndef yyterminate
#define yyterminate() return YY_NULL
#endif

/* Number of entries by which start-condition stack grows. */
#ifndef YY_START_STACK_INCR
#define YY_START_STACK_INCR 25
#endif

/* Report a fatal error. */
#ifndef YY_FATAL_ERROR
#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
#endif

/* end tables serialization structures and prototypes */

/* Default declaration of generated scanner - a define so the user can
 * easily add parameters.
 */
#ifndef YY_DECL
#define YY_DECL_IS_OURS 1

extern int yylex (void);

#define YY_DECL int yylex (void)
#endif /* !YY_DECL */

/* Code executed at the beginning of each rule, after yytext and yyleng
 * have been set up.
 */
#ifndef YY_USER_ACTION
#define YY_USER_ACTION
#endif

/* Code executed at the end of each rule. */
#ifndef YY_BREAK
#define YY_BREAK break;
#endif

#define YY_RULE_SETUP \
	YY_USER_ACTION

/** The main scanner function which does all the work.
 */
YY_DECL
{
	register yy_state_type yy_current_state;
	register char *yy_cp, *yy_bp;
	register int yy_act;
    
#line 192 "lex.l"


#line 856 "lex.c"

	if ( !(yy_init) )
		{
		(yy_init) = 1;

#ifdef YY_USER_INIT
		YY_USER_INIT;
#endif

		if ( ! (yy_start) )
			(yy_start) = 1;	/* first start state */

		if ( ! yyin )
			yyin = stdin;

		if ( ! yyout )
			yyout = stdout;

		if ( ! YY_CURRENT_BUFFER ) {
			yyensure_buffer_stack ();
			YY_CURRENT_BUFFER_LVALUE =
				yy_create_buffer(yyin,YY_BUF_SIZE );
		}

		yy_load_buffer_state( );
		}

	while ( 1 )		/* loops until end-of-file is reached */
		{
		yy_cp = (yy_c_buf_p);

		/* Support of yytext. */
		*yy_cp = (yy_hold_char);

		/* yy_bp points to the position in yy_ch_buf of the start of
		 * the current run.
		 */
		yy_bp = yy_cp;

		yy_current_state = (yy_start);
yy_match:
		do
			{
			register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)];
			if ( yy_accept[yy_current_state] )
				{
				(yy_last_accepting_state) = yy_current_state;
				(yy_last_accepting_cpos) = yy_cp;
				}
			while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
				{
				yy_current_state = (int) yy_def[yy_current_state];
				if ( yy_current_state >= 66 )
					yy_c = yy_meta[(unsigned int) yy_c];
				}
			yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
			++yy_cp;
			}
		while ( yy_base[yy_current_state] != 130 );

yy_find_action:
		yy_act = yy_accept[yy_current_state];
		if ( yy_act == 0 )
			{ /* have to back up */
			yy_cp = (yy_last_accepting_cpos);
			yy_current_state = (yy_last_accepting_state);
			yy_act = yy_accept[yy_current_state];
			}

		YY_DO_BEFORE_ACTION;

do_action:	/* This label is used only to access EOF actions. */

		switch ( yy_act )
	{ /* beginning of action switch */
			case 0: /* must back up */
			/* undo the effects of YY_DO_BEFORE_ACTION */
			*yy_cp = (yy_hold_char);
			yy_cp = (yy_last_accepting_cpos);
			yy_current_state = (yy_last_accepting_state);
			goto yy_find_action;

case 1:
YY_RULE_SETUP
#line 194 "lex.l"
/* nop */
	YY_BREAK
case 2:
/* rule 2 can match eol */
YY_RULE_SETUP
#line 195 "lex.l"
if (parse_cstring(&YY_LVALP->scalar, yytext+1, strlen(yytext+1)-1)) return EVAL_STR;
	YY_BREAK
case 3:
/* rule 3 can match eol */
YY_RULE_SETUP
#line 196 "lex.l"
if (parse_pstring(&YY_LVALP->scalar, yytext+1, strlen(yytext+1)-1)) return EVAL_STR;
	YY_BREAK
case 4:
YY_RULE_SETUP
#line 197 "lex.l"
return EVAL_STR_LT;
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 198 "lex.l"
return EVAL_STR_LE;
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 199 "lex.l"
return EVAL_STR_GT;
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 200 "lex.l"
return EVAL_STR_GE;
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 201 "lex.l"
return EVAL_STR_EQ;
	YY_BREAK
case 9:
YY_RULE_SETUP
#line 202 "lex.l"
return EVAL_STR_NE;
	YY_BREAK
case 10:
YY_RULE_SETUP
#line 203 "lex.l"
return EVAL_POW;
	YY_BREAK
case 11:
YY_RULE_SETUP
#line 204 "lex.l"
return EVAL_SHL;
	YY_BREAK
case 12:
YY_RULE_SETUP
#line 205 "lex.l"
return EVAL_SHR;
	YY_BREAK
case 13:
YY_RULE_SETUP
#line 206 "lex.l"
return EVAL_LT;
	YY_BREAK
case 14:
YY_RULE_SETUP
#line 207 "lex.l"
return EVAL_LE;
	YY_BREAK
case 15:
YY_RULE_SETUP
#line 208 "lex.l"
return EVAL_GT;
	YY_BREAK
case 16:
YY_RULE_SETUP
#line 209 "lex.l"
return EVAL_GE;
	YY_BREAK
case 17:
YY_RULE_SETUP
#line 210 "lex.l"
return EVAL_EQ;
	YY_BREAK
case 18:
YY_RULE_SETUP
#line 211 "lex.l"
return EVAL_NE;
	YY_BREAK
case 19:
YY_RULE_SETUP
#line 212 "lex.l"
return EVAL_LAND;
	YY_BREAK
case 20:
YY_RULE_SETUP
#line 213 "lex.l"
return EVAL_LOR;
	YY_BREAK
case 21:
YY_RULE_SETUP
#line 214 "lex.l"
return EVAL_LXOR;
	YY_BREAK
case 22:
YY_RULE_SETUP
#line 215 "lex.l"
YY_LVALP->ident=strdup(yytext); return EVAL_IDENT;
	YY_BREAK
case 23:
YY_RULE_SETUP
#line 216 "lex.l"