139 lines
2.6 KiB
Plaintext
139 lines
2.6 KiB
Plaintext
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%option prefix="expr_"
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%option reentrant
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%option bison-bridge
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%{
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#include <linux/compiler.h>
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#include "expr.h"
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#include "expr-bison.h"
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#include <math.h>
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char *expr_get_text(yyscan_t yyscanner);
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YYSTYPE *expr_get_lval(yyscan_t yyscanner);
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static double __value(YYSTYPE *yylval, char *str, int token)
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{
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double num;
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errno = 0;
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num = strtod(str, NULL);
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if (errno)
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return EXPR_ERROR;
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yylval->num = num;
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return token;
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}
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static int value(yyscan_t scanner)
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{
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YYSTYPE *yylval = expr_get_lval(scanner);
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char *text = expr_get_text(scanner);
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return __value(yylval, text, NUMBER);
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}
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/*
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* Allow @ instead of / to be able to specify pmu/event/ without
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* conflicts with normal division.
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*/
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static char *normalize(char *str, int runtime)
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{
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char *ret = str;
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char *dst = str;
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while (*str) {
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if (*str == '\\') {
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*dst++ = *++str;
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if (!*str)
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break;
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}
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else if (*str == '?') {
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char *paramval;
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int i = 0;
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int size = asprintf(¶mval, "%d", runtime);
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if (size < 0)
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*dst++ = '0';
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else {
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while (i < size)
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*dst++ = paramval[i++];
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free(paramval);
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}
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}
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else
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*dst++ = *str;
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str++;
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}
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*dst = 0x0;
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return ret;
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}
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static int str(yyscan_t scanner, int token, int runtime)
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{
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YYSTYPE *yylval = expr_get_lval(scanner);
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char *text = expr_get_text(scanner);
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yylval->str = normalize(strdup(text), runtime);
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if (!yylval->str)
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return EXPR_ERROR;
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yylval->str = normalize(yylval->str, runtime);
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return token;
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}
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static int literal(yyscan_t scanner, const struct expr_scanner_ctx *sctx)
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{
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YYSTYPE *yylval = expr_get_lval(scanner);
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yylval->num = expr__get_literal(expr_get_text(scanner), sctx);
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if (isnan(yylval->num)) {
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if (!sctx->is_test)
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return EXPR_ERROR;
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yylval->num = 1;
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}
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return LITERAL;
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}
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%}
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number ([0-9]+\.?[0-9]*|[0-9]*\.?[0-9]+)(e-?[0-9]+)?
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sch [-,=]
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spec \\{sch}
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sym [0-9a-zA-Z_\.:@?]+
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symbol ({spec}|{sym})+
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literal #[0-9a-zA-Z_\.\-]+
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%%
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struct expr_scanner_ctx *sctx = expr_get_extra(yyscanner);
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d_ratio { return D_RATIO; }
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max { return MAX; }
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min { return MIN; }
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if { return IF; }
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else { return ELSE; }
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source_count { return SOURCE_COUNT; }
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{literal} { return literal(yyscanner, sctx); }
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{number} { return value(yyscanner); }
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{symbol} { return str(yyscanner, ID, sctx->runtime); }
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"|" { return '|'; }
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"^" { return '^'; }
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"&" { return '&'; }
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"<" { return '<'; }
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">" { return '>'; }
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"-" { return '-'; }
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"+" { return '+'; }
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"*" { return '*'; }
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"/" { return '/'; }
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"%" { return '%'; }
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"(" { return '('; }
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")" { return ')'; }
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"," { return ','; }
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. { }
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%%
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int expr_wrap(void *scanner __maybe_unused)
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{
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return 1;
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}
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