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scanner.c
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scanner.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <ctype.h>
#include "mas.h"
#include "y.tab.h"
#include "keyword.h"
#include "info.h"
#define ISASCII(c) isascii((unsigned char)(c))
#define ISALNUM(c) (ISASCII(c) && isalnum((unsigned char)(c)))
#define SIGN_EXTEND_CHAR(c) ((signed char)(c))
#define is_identchar(c) (SIGN_EXTEND_CHAR(c)!=-1&&(ISALNUM(c) || (c) == '_'))
extern struct OPE *in_word_set(char*, unsigned int);
#define FALSE 0
#define TRUE 1
#define BUFSIZE 1024
FILE *yyin;
uint8_t *yytext = NULL;
int ytp = 0;
int yt_max = 0;
static uint8_t *buffer = NULL;
static uint32_t ptr;
static uint32_t limit = 0;
typedef enum {
INITIAL_STATUS,
IN_INT_PART_STATUS,
DOT_STATUS,
IN_FRAC_PART_STATUS
} LexerStatus;
static void real_read() {
// printf("real read\n");
if (buffer == NULL) {
buffer = (uint8_t*)malloc(BUFSIZE);
}
if (yytext == NULL) {
yytext = (uint8_t*)malloc(BUFSIZE);
yt_max += BUFSIZE;
}
ptr = 0;
limit = fread(buffer, 1, BUFSIZE, yyin);
// printf("limit = %d\n", (int)limit);
}
uint8_t read() {
if (ptr == limit) real_read();
if (limit == 0) {
return EOF;
}
return buffer[ptr++];
}
void done() {
free(buffer);
free(yytext);
}
static void pushback(int c) {
if (c == -1) return;
if (ptr > 0) --ptr;
}
/* Dynamically extend yytext */
static void addtext(char c) {
if (ytp == (yt_max - 1)) {
yt_max += BUFSIZE;
yytext = (uint8_t*)realloc(yytext, yt_max);
}
yytext[ytp++] = c;
yytext[ytp] = 0;
}
static void error() {
fprintf(stderr, "cannot understand character: %s\n", yytext);
exit(1);
}
int yylex() {
char c;
ytp = 0;
// char *v = "ab\"c";
// fprintf(stderr, "yylex\n");
retry:
switch(c = read()) {
case '#': {
while ((c = read()) != '\n');
mas_get_localinfo()->line_number++;
goto retry;
}
case ' ':
case '\t': { // skip space
goto retry;
}
case '\n': {
// mas_get_localinfo()->line_number++;
mas_get_localinfo()->line_number++;
goto retry;
}
case EOF: {
// printf("eof\n");
return EOF;
}
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9': {
addtext(c);
if (c == '0') { // can be double
c = read();
if (c != '.' && isdigit(c)) {
error();
} else if (c == '.') { // double
addtext(c);
while (isdigit(c = read())) {
addtext(c);
}
pushback(c);
double d_value;
// sscanf((char*)yytext, "%lf", &yylval.double_value);
sscanf((char*)yytext, "%lf", &d_value);
Expression* expr = mas_create_double_expression(d_value);
yylval.expression = expr;
return DOUBLE_LITERAL;
} else {
pushback(c);
int i_value;
sscanf((char*)yytext, "%d", &i_value);
Expression* expr = mas_create_int_expression(i_value);
yylval.expression = expr;
// printf("int value = %d\n", yylval.int_value);
return INT_LITERAL;
}
} else { // int
while(isdigit(c = read())) {
addtext(c);
}
if (c == '.') {
addtext(c);
while(isdigit(c = read())) {
addtext(c);
}
double d_value;
pushback(c);
// sscanf((char*)yytext, "%lf", &yylval.double_value);
sscanf((char*)yytext, "%lf", &d_value);
Expression* expr = mas_create_double_expression(d_value);
yylval.expression = expr;
return DOUBLE_LITERAL;
} else {
pushback(c);
int i_value;
sscanf((char*)yytext, "%d", &i_value);
Expression* expr = mas_create_int_expression(i_value);
// sscanf((char*)yytext, "%d", &yylval.int_value);
yylval.expression = expr;
return INT_LITERAL;
}
}
break;
}
case '(': {
addtext(c);
return LP;
}
case ')': {
addtext(c);
return RP;
}
case '{': {
addtext(c);
return LC;
}
case '}': {
addtext(c);
return RC;
}
case ';': {
addtext(c);
return SEMICOLON;
}
case ',': {
addtext(c);
return COMMA;
}
case '&': {
addtext(c);
c = read();
if (c == '&') {
addtext(c);
return LOGICAL_AND;
} else {
error();
}
}
case '|': {
addtext(c);
c = read();
if (c == '|') {
addtext(c);
return LOGICAL_OR;
} else {
error();
}
}
case '=': {
addtext(c);
if ((c = read()) == '=') {
addtext(c);
return EQ;
} else {
pushback(c);
return ASSIGN;
}
}
case '!': {
addtext(c);
if ((c = read()) == '=') {
addtext(c);
return NE;
} else {
error();
}
}
case '>': {
addtext(c);
if ((c = read()) == '=') {
addtext(c);
return GE;
} else {
pushback(c);
return GT;
}
}
case '<': {
addtext(c);
if ((c = read()) == '=') {
addtext(c);
return LE;
} else {
pushback(c);
return LT;
}
}
case '.': {
addtext(c);
return DOT;
}
case '[': {
addtext(c);
return LB;
}
case ']': {
addtext(c);
return RB;
}
case '+': {
addtext(c);
c = read();
if (c == '+') {
addtext(c);
return INCREMENT;
} else {
pushback(c);
return ADD;
}
}
case '-': {
addtext(c);
c = read();
if (c == '-') {
addtext(c);
return DECREMENT;
} else {
pushback(c);
return SUB;
}
}
case '*': {
addtext(c);
return MUL;
}
case '/': {
addtext(c);
return DIV;
}
case '%': {
addtext(c);
return MOD;
}
case '"': {
mas_open_string_literal();
int flg = FALSE;
while(1) {
c = read();
// fprintf(stderr, "c = %c\n", c);
switch (c) {
case 'n': {
// fprintf(stderr, "match n\n");
// if (yytext[ytp - 1] == '\\') {
if (mas_read_previous() == '\\') {
// fprintf(stderr, "match previous slash\n");
if (flg == TRUE) {
mas_add_string_literal(c);
// addtext(c);
flg = FALSE;
} else {
// --ytp;
// mas_add_string_literal('\n');
mas_add_previous('\n');
// addtext('\n');
}
continue;
}
}
case 't': {
if (mas_read_previous() == '\\') {
// if (yytext[ytp - 1] == '\\') {
if (flg == TRUE) {
mas_add_string_literal(c);
// addtext(c);
flg = FALSE;
} else {
--ytp;
// mas_add_string_literal('\t');
mas_add_previous('\t');
// addtext('\t');
}
continue;
}
}
case '"': {
if (mas_read_previous() == '\\') {
// if (yytext[ytp - 1] == '\\') {
// --ytp;
// mas_add_string_literal('"');
mas_add_previous('"');
// addtext('"');
continue;
}
}
case '\\': {
if (mas_read_previous() == '\\') {
// if (yytext[ytp - 1] == '\\') {
// --ytp;
// addtext('\\');
// fprintf(stderr, "slash herere\n");
// mas_add_string_literal('\\');
mas_add_previous('\\');
flg = TRUE;
continue;
}
}
}
if (c == '"') {
// yylval.identifier = (char*)yytext;
// yylval.identifier = mas_create_identifier((char*)yytext);
// yylval.identifier = mas_close_string_literal();
/*
int p;
char* tmp = mas_close_string_literal();
fprintf(stderr, "tmp char len = %d\n", (int)strlen(tmp));
for (p = 0; p < strlen(tmp); ++p) {
fprintf(stderr, "%02x\n", tmp[p]);
}
Expression* expr = mas_create_string_expression(tmp);
*/
Expression* expr = mas_create_string_expression(mas_close_string_literal());
yylval.expression = expr;
return STRING_LITERAL;
}
mas_add_string_literal(c);
// addtext(c);
}
error();
}
default: {
// printf("end of switch: %c\n", c);
break;
}
}
while (is_identchar(c)) {
addtext(c);
c = read();
}
pushback(c);
struct OPE *op = in_word_set((char*)yytext, strlen((char*)yytext));
if (op != NULL) {
return op->type;
}
//yylval.identifier = (char*)yytext;
yylval.identifier = mas_create_identifier((char*)yytext);
// printf("%s\n", yytext);
return IDENTIFIER;
// exit(1);
// return EOF;
}
/*
int main(void) {
int i;
char c;
yyin = fopen("rtest.ma", "r");
if (yyin == NULL) {
printf("error\n");
exit(1);
}
for (i = 0; i < 3; ++i) {
c = read();
printf("char = %c\n", c);
}
printf("ptr = %d\n", ptr);
c = read();
printf("char = %c\n", c);
printf("ptr = %d\n", ptr);
pushback(c);
printf("ptr = %d\n", ptr);
c = read();
printf("char = %c\n", c);
c = read();
printf("char = %c\n", c);
printf("ptr = %d\n", ptr);
c = read();
printf("char = %d\n", c);
printf("EOF = %d\n", EOF);
return 0;
}
*/