1%option prefix="expr_"
  2%option reentrant
  3%option bison-bridge
  4
  5%{
  6#include <linux/compiler.h>
  7#include "expr.h"
  8#include "expr-bison.h"
  9
 10char *expr_get_text(yyscan_t yyscanner);
 11YYSTYPE *expr_get_lval(yyscan_t yyscanner);
 12
 13static double __value(YYSTYPE *yylval, char *str, int token)
 14{
 15	double num;
 16
 17	errno = 0;
 18	num = strtod(str, NULL);
 19	if (errno)
 20		return EXPR_ERROR;
 21
 22	yylval->num = num;
 23	return token;
 24}
 25
 26static int value(yyscan_t scanner)
 27{
 28	YYSTYPE *yylval = expr_get_lval(scanner);
 29	char *text = expr_get_text(scanner);
 30
 31	return __value(yylval, text, NUMBER);
 32}
 33
 34/*
 35 * Allow @ instead of / to be able to specify pmu/event/ without
 36 * conflicts with normal division.
 37 */
 38static char *normalize(char *str, int runtime)
 39{
 40	char *ret = str;
 41	char *dst = str;
 42
 43	while (*str) {
 44		if (*str == '@')
 45			*dst++ = '/';
 46		else if (*str == '\\')
 47			*dst++ = *++str;
 48		 else if (*str == '?') {
 49			char *paramval;
 50			int i = 0;
 51			int size = asprintf(&paramval, "%d", runtime);
 52
 53			if (size < 0)
 54				*dst++ = '0';
 55			else {
 56				while (i < size)
 57					*dst++ = paramval[i++];
 58				free(paramval);
 59			}
 60		}
 61		else
 62			*dst++ = *str;
 63		str++;
 64	}
 65
 66	*dst = 0x0;
 67	return ret;
 68}
 69
 70static int str(yyscan_t scanner, int token, int runtime)
 71{
 72	YYSTYPE *yylval = expr_get_lval(scanner);
 73	char *text = expr_get_text(scanner);
 74
 75	yylval->str = normalize(strdup(text), runtime);
 76	if (!yylval->str)
 77		return EXPR_ERROR;
 78
 79	yylval->str = normalize(yylval->str, runtime);
 80	return token;
 81}
 82%}
 83
 84number		([0-9]+\.?[0-9]*|[0-9]*\.?[0-9]+)
 85
 86sch		[-,=]
 87spec		\\{sch}
 88sym		[0-9a-zA-Z_\.:@?]+
 89symbol		({spec}|{sym})+
 90
 91%%
 92	struct expr_scanner_ctx *sctx = expr_get_extra(yyscanner);
 93
 94	{
 95		int start_token = sctx->start_token;
 96
 97		if (sctx->start_token) {
 98			sctx->start_token = 0;
 99			return start_token;
100		}
101	}
102
103d_ratio		{ return D_RATIO; }
104max		{ return MAX; }
105min		{ return MIN; }
106if		{ return IF; }
107else		{ return ELSE; }
108#smt_on		{ return SMT_ON; }
109{number}	{ return value(yyscanner); }
110{symbol}	{ return str(yyscanner, ID, sctx->runtime); }
111"|"		{ return '|'; }
112"^"		{ return '^'; }
113"&"		{ return '&'; }
114"<"		{ return '<'; }
115">"		{ return '>'; }
116"-"		{ return '-'; }
117"+"		{ return '+'; }
118"*"		{ return '*'; }
119"/"		{ return '/'; }
120"%"		{ return '%'; }
121"("		{ return '('; }
122")"		{ return ')'; }
123","		{ return ','; }
124.		{ }
125%%
126
127int expr_wrap(void *scanner __maybe_unused)
128{
129	return 1;
130}