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|
%option noyywrap reentrant bison-bridge
%option outfile="lex.yy.c"
%option prefix="ccmmc_parser_"
%{
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "common.h"
#include "state.h"
#include "libparser_a-parser.h"
#include <assert.h>
#include <limits.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#define YYSTYPE CCMMC_PARSER_STYPE
%}
letter [A-Za-z]
digit [0-9]
ID {letter}({letter}|{digit}|"_")*
WS [ \t]+
/* You need to define the following RE's */
CONST_INT {digit}+
CONST_FLOAT (([0-9]+\.?|[0-9]*\.[0-9]+)([eE][-+]?[0-9]+)?)
CONST_STRING \"([^\"\n]|(\\.))*\"
COMMENT \/\*([^*]|\n|(\*+([^*/]|\n)))*\*+\/
/* operators */
OP_ASSIGN "="
OP_OR "||"
OP_AND "&&"
OP_NOT "!"
OP_ADD "+"
OP_SUB "-"
OP_MUL "*"
OP_DIV "/"
OP_GT ">"
OP_LT "<"
OP_GE ">="
OP_LE "<="
OP_NE "!="
OP_EQ "=="
NEWLINE "\n"
/* separators */
DL_LPAREN "("
DL_RPAREN ")"
DL_LBRACK "["
DL_RBRACK "]"
DL_LBRACE "{"
DL_RBRACE "}"
DL_COMMA ","
DL_SEMICOL ";"
DL_DOT "."
ERROR .
%%
{WS} {}
{ID} {
size_t i;
char *reserved[] = {"return", "typedef", "if", "else",
"int", "float", "for", "void", "while"};
enum ccmmc_parser_tokentype reserved_token[] = {RETURN,
TYPEDEF, IF, ELSE, INT, FLOAT, FOR, VOID, WHILE};
static_assert(
SIZEOF_ARRAY(reserved) == SIZEOF_ARRAY(reserved_token),
"Reserved words array and reserved tokens array "
"must have the same size");
for (i = 0; i < SIZEOF_ARRAY(reserved); i++)
if (strcmp(yytext, reserved[i]) == 0)
return reserved_token[i];
yylval->lexeme = strdup(yytext);
ERR_FATAL_CHECK(yylval->lexeme, strdup);
return ID;
}
{CONST_INT} {
CcmmcState *state = yyextra;
int errno_save = errno;
errno = 0;
long value = strtol(yytext, NULL, 10);
if (value > INT_MAX ||
(errno == ERANGE && value == LONG_MAX)) {
fprintf(stderr, "%zu: error: `%s' overflows\n",
state->line_number, yytext);
exit(1);
}
if (value < INT_MIN ||
(errno == ERANGE && value == LONG_MIN)) {
fprintf(stderr, "%zu: error: `%s' underflows\n",
state->line_number, yytext);
exit(1);
}
if (errno != 0) {
ERR_DECL;
fprintf(stderr, "%zu: error: unexpected interger "
"conversion failure: %s\n",
state->line_number, ERR_MSG);
exit(1);
}
yylval->value_const.kind = CCMMC_KIND_CONST_INT;
yylval->value_const.const_int = value;
errno = errno_save;
return CONST;
}
{CONST_FLOAT} {
CcmmcState *state = yyextra;
int errno_save = errno;
errno = 0;
float value = strtof(yytext, NULL);
if (errno == ERANGE && value == HUGE_VAL) {
fprintf(stderr, "%zu: error: `%s' overflows\n",
state->line_number, yytext);
exit(1);
}
if (errno == ERANGE && value == 0.0) {
fprintf(stderr, "%zu: error: `%s' underflows\n",
state->line_number, yytext);
exit(1);
}
if (errno != 0) {
ERR_DECL;
fprintf(stderr, "%zu: error: unexpected floating point "
"conversion failure: %s\n",
state->line_number, ERR_MSG);
exit(1);
}
yylval->value_const.kind = CCMMC_KIND_CONST_FLOAT;
yylval->value_const.const_float = value;
errno = errno_save;
return CONST;
}
{CONST_STRING} {
size_t len = strlen(yytext);
yylval->value_const.kind = CCMMC_KIND_CONST_STRING;
yylval->value_const.const_string = strndup(yytext + 1, len - 2);
ERR_FATAL_CHECK(yylval->value_const.const_string, strdup);
return CONST;
}
{COMMENT} {
CcmmcState *state = yyextra;
for (size_t i = 0; yytext[i] != '\0'; i++)
if (yytext[i] == '\n')
state->line_number++;
}
{OP_ASSIGN} return OP_ASSIGN;
{OP_OR} return OP_OR;
{OP_AND} return OP_AND;
{OP_NOT} return OP_NOT;
{OP_ADD} return OP_ADD;
{OP_SUB} return OP_SUB;
{OP_MUL} return OP_MUL;
{OP_DIV} return OP_DIV;
{OP_GT} return OP_GT;
{OP_LT} return OP_LT;
{OP_GE} return OP_GE;
{OP_LE} return OP_LE;
{OP_NE} return OP_NE;
{OP_EQ} return OP_EQ;
{NEWLINE} {
CcmmcState *state = yyextra;
state->line_number++;
}
{DL_LPAREN} return DL_LPAREN;
{DL_RPAREN} return DL_RPAREN;
{DL_LBRACK} return DL_LBRACK;
{DL_RBRACK} return DL_RBRACK;
{DL_LBRACE} return DL_LBRACE;
{DL_RBRACE} return DL_RBRACE;
{DL_COMMA} return DL_COMMA;
{DL_SEMICOL} return DL_SEMICOL;
{DL_DOT} return DL_DOT;
{ERROR} {
CcmmcState *state = yyextra;
fprintf(stderr, "%zu: error: undefined character `%s'\n",
state->line_number, yytext);
exit(1);
}
%%
// vim: set sw=4 ts=4 sts=4 et:
|
