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lexer.c
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lexer.c
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#include <stdlib.h>
#include <assert.h>
//#include <math.h>
#include "lexer.h"
#include "lxrctype.h"
typedef LXR_Token Token;
typedef LXR_TokenPtr TokenPtr;
typedef LXR_StrToken StrToken;
typedef LXR_StrTokenPtr StrTokenPtr;
typedef LXR_IntToken IntToken;
typedef LXR_IntTokenPtr IntTokenPtr;
typedef LXR_FloatToken FloatToken;
typedef LXR_FloatTokenPtr FloatTokenPtr;
#define LXR_MAX_WORD_SIZE 500
#define LXR_MAX_STR_WIDTH 4095
Lexer lexer;
char lxr_buff[LXR_MAX_STR_WIDTH];
char *buff = lxr_buff;
Token lxr_EOF = {LXRE_EOF, 0, 0};
TokenPtr lxr_lastToken;
#define LXR_GETCHAR (lexer.col++, getc(lexer.f))
#define LXR_UNGETC(c) (ungetc(c, lexer.f), lexer.col--)
#define LXR_FEED(c, len) (buff[len++] = c, c = LXR_GETCHAR)
#define LXR_FEED_WHILE(c, cond, len) while(cond)LXR_FEED(c, len)
#define LXR_FEED_IF(c, cond, len) ((cond) ? (LXR_FEED(c, len), true) : false)
#define LXR_THROW_ERROR_FMT(fmt, ...) { \
sprintf(buff, fmt, __VA_ARGS__); \
lexer.last = LXR_GETCHAR; \
return newErrorToken(); \
}
inline static void provokeLineFeed();
inline static TokenPtr initToken(TokenPtr, LXR_TokenType);
static TokenPtr initStrToken(StrTokenPtr, LXR_TokenType, int);
static TokenPtr initIntToken(IntTokenPtr, int);
inline static TokenPtr initFloatToken(FloatTokenPtr, int);
static TokenPtr newErrorToken();
static TokenPtr readNum(char);
static TokenPtr readId();
//static TokenPtr readPreproc();
static bool missComments();
static TokenPtr throwErrorFmtExpect(char expect[], char but, int len){
char p[len+1];
memcpy(p, buff, len);
p[len] = 0;
char butStr[2] = {but, 0};
LXR_THROW_ERROR_FMT("After %s: %s expected, but '%s'(%hhu) found", p, expect, isblank(but) ? butStr : "\\n", but)
}
void provokeLineFeed(){
lexer.str++;
lexer.col = 0;
}
TokenPtr initToken(TokenPtr tok, LXR_TokenType type){
tok->type = type;
tok->line = lexer.str;
tok->col = lexer.start;
lxr_lastToken = tok;
return tok;
}
TokenPtr initStrToken(StrTokenPtr tok, LXR_TokenType type, int len){
initToken((TokenPtr)tok, type);
tok->buff = NEW_SEQ(char, len + 1);
for(int i = 0; i < len; i++) tok->buff[i] = buff[i];
tok->buff[len] = 0;
tok->length = len;
return (TokenPtr)tok;
}
TokenPtr initIntToken(IntTokenPtr tok, int len){
char *proto = buff;
initStrToken((StrTokenPtr)tok, LXRE_INT_CONST, len);
int mult = proto[0] == '0' ? 8 : 10, start = (int)proto[0] == '0';
if(mult == 8 && tolower(proto[1]) == 'x'){
mult *= 2;
start++;
}
unsigned result = 0;
for(int i = start; i < len; i++){
result *= mult;
result += xToInt(proto[i]);
}
tok->value = result;
return (TokenPtr)tok;
}
TokenPtr initFloatToken(FloatTokenPtr tok, int len){
initStrToken((StrTokenPtr)tok, LXRE_FLOAT_CONST, len);
#ifdef LXR_DONT_USE_STDLIB_ATOF
char *proto = buff;
bool isHex = tolower(proto[1]) == 'x';
assert(proto[0] == '0' || !isHex);
if(isHex) proto += 2, len -= 2;
int dotPos = 0;
for(; dotPos < len && proto[dotPos] != '.'; dotPos++);
//assert(dotPos == len); && epos == len
char e = isHex ? 'p' : 'e';
int ePos = 0;
for(; ePos < len && tolower(proto[ePos]) != e; ePos++);
assert(ePos != len || !isHex && dotPos != len);
assert(dotPos == len || dotPos < ePos);
double res = 0;
int mult = isHex ? 16 : 10, base = isHex ? 2 : 10;
for(int i = ePos - 1; i > dotPos; i--)
res /= mult += xToInt(proto[i]);
for(int i = min(dotPos, ePos) -1; i >= 0; i--)
res /= mult += xToInt(proto[i]);
//это всё не компилируется
#else
tok->value = atof(tok->parent.buff);
#endif
return (TokenPtr)tok;
}
TokenPtr newErrorToken(){
return initStrToken(NEW(StrToken), LXRE_TOKEN_INVALID, strlen(buff));
}
#define LXR_THROW_ERROR_FMT_EXPECT(expect, but) return throwErrorFmtExpect(expect, but, len);
TokenPtr readNum(char c){
int len = c != '.';
TokenPtr tok = NULL;
bool isHexNum = c == '0' && lexer.last == 'x';
buff[0] = c;
if(isHexNum){
/*
0x(\h*\.)?\h*(p[+-]?\d+)?
*/
buff[1] = 'x';
len++;
c = LXR_GETCHAR;
if(!isxdigit(c) && c != '.')
LXR_THROW_ERROR_FMT_EXPECT("hex digit or '.'", c)
LXR_FEED_WHILE(c, isxdigit(c), len);
if(LXR_FEED_IF(c, c == '.', len)){
if(!isxdigit(c))
LXR_THROW_ERROR_FMT_EXPECT("hex digit or 'p'", c)
LXR_FEED_WHILE(c, isxdigit(c), len);
if(LXR_FEED_IF(c, tolower(c) == 'p', len)){
LXR_FEED_IF(c, isSign(c), len);
if(!isdigit(c))
LXR_THROW_ERROR_FMT_EXPECT("digit", c);
LXR_FEED_WHILE(c, isdigit(c), len);
}
tok = initFloatToken(NEW(FloatToken), len);
} else{
tok = initIntToken(NEW(IntToken), len);
}
} else if(c == '0' && isdigit(lexer.last)){
if(!isOct(lexer.last))
LXR_THROW_ERROR_FMT_EXPECT("octal digit", c);
buff[1] = lexer.last;
c = LXR_GETCHAR;
LXR_FEED_WHILE(c, isOct(c), len);
if(isdigit(c))
LXR_THROW_ERROR_FMT_EXPECT("octal digit", c);
tok = initIntToken(NEW(IntToken), len);
} else if(!isalpha(lexer.last) || lexer.last == 'e'){
if(c != '.'){
c = lexer.last;
LXR_FEED_WHILE(c, isdigit(c), len);
} else LXR_UNGETC(lexer.last);
if(c == '.' || tolower(c) == 'e'){
if(LXR_FEED_IF(c, c == '.', len)){
LXR_FEED_WHILE(c, isdigit(c), len);
}
if(LXR_FEED_IF(c, tolower(c) == 'e', len)){
LXR_FEED_IF(c, isSign(c), len);
if(!isdigit(c))
LXR_THROW_ERROR_FMT_EXPECT("digit", c);
LXR_FEED_WHILE(c, isdigit(c), len);
}
tok = initFloatToken(NEW(FloatToken), len);
} else{
tok = initIntToken(NEW(IntToken), len);
}
} else
LXR_THROW_ERROR_FMT_EXPECT("digit or e", c);
lexer.last = c;
return tok;
}
TokenPtr readId(){
char c = lexer.last;
int len = 0;
LXR_FEED_WHILE(c, isId(c), len);
buff[len] = 0;
lexer.last = c;
static char *kws[LXR_KEYWORDS_COUNT] = {
"auto", "break", "case", "char", "const", "continue",
"default", "do", "double", "else", "enum", "extern",
"float", "for", "goto", "if", "inline", "int", "long",
"register", "restrict", "return", "short", "signed",
"sizeof", "static", "struct", "switch", "typedef",
"union", "unsigned", "void", "volatile", "while",
};
for(int i = 0; i < LXR_KEYWORDS_COUNT; i++)
if(!strcmp(buff, kws[i]))
return initToken(NEW(Token), i + LXRE_KEYWORDS_START);
return initStrToken(NEW(StrToken), LXRE_IDENTIFIER, len);
}
bool missComments(){
while(lexer.last == '/'){
char c = LXR_GETCHAR;
switch(c){
case '*':
lexer.last = LXR_GETCHAR;
while(1){
c = lexer.last;
lexer.last = LXR_GETCHAR;
if(c == '*' && lexer.last == '/') break;
if(lexer.last == EOF) return true;
}
lexer.last = LXR_GETCHAR;
return true;
case '/':
fgets(buff, LXR_MAX_STR_WIDTH, lexer.f);
provokeLineFeed();
lexer.last = LXR_GETCHAR;
return true;
default:
lexer.last = '/';
LXR_UNGETC(c);
return false;
}
}
return false;
}
static inline int errorChar(char c){
return -(int)(unsigned)(unsigned char)c;
}
static int readChar(int len){
char c = lexer.last;
if(c == '\\'){
char res = c = LXR_GETCHAR;
switch(c){
case '\'': case '?': case '\\': case '"':
res = c; c = LXR_GETCHAR; break;
case 'a': res = '\a'; c = LXR_GETCHAR; break;
case 'b': res = '\b'; c = LXR_GETCHAR; break;
case 'f': res = '\f'; c = LXR_GETCHAR; break;
case 'n': res = '\n'; c = LXR_GETCHAR; break;
case 'r': res = '\r'; c = LXR_GETCHAR; break;
case 't': res = '\t'; c = LXR_GETCHAR; break;
case 'v': res = '\v'; c = LXR_GETCHAR; break;
case 'x':
c = LXR_GETCHAR;
if(!isxdigit(c)) return errorChar('x');
res = xToInt(c);
c = LXR_GETCHAR;
if(isxdigit(c)){
res = res << 4 | (char)xToInt(c);
c = LXR_GETCHAR;
}
break;
default:
if(isOct(c)){
res = c - '0';
if(isOct(c = LXR_GETCHAR)){
res = (res << 3) | (c - '0');
if(isOct(c = LXR_GETCHAR)){
res = (res << 3) | (c - '0');
c = LXR_GETCHAR;
}
}
} else return errorChar(c);
}
buff[len++] = res;
} else LXR_FEED(c, len);
lexer.last = c;
return len;
}
static TokenPtr readString(char term){
int len = 0;
while(lexer.last != term && !isNewline(lexer.last) && lexer.last != EOF){
len = readChar(len);
if(len < 0){
char c = -len;
while(lexer.last != term && !isNewline(lexer.last) && lexer.last != EOF) lexer.last = LXR_GETCHAR;
LXR_THROW_ERROR_FMT("At position %d: unexpected character '%c'(%hhu) occured in escape sequence", lexer.col, c, c)
}
}
if(isNewline(lexer.last)){
LXR_UNGETC(lexer.last);
LXR_THROW_ERROR_FMT("Terminal character expected before end of line%c", 0)
}
if(lexer.last == EOF)
LXR_THROW_ERROR_FMT("Unexpected end of file%c", 0)
lexer.last = LXR_GETCHAR;
if(term == '\''){
if(len > 1)
LXR_THROW_ERROR_FMT("Character sequence is too long%c", 0)
if(len < 1)
LXR_THROW_ERROR_FMT("Character sequence is empty%c", 0)
IntTokenPtr t = NEW(IntToken);
t->value = buff[0];
buff[1] = buff[0];
buff[0] = buff[2] = term;
return initStrToken((StrTokenPtr)t, LXRE_INT_CONST, 3);
}
return initStrToken(NEW(StrToken), LXRE_STRING_CONST, len);
}
LXR_TokenPtr lxr_nextToken(){
char c = lexer.last;
do{
c = lexer.last;
while(isspace(c)){
if(!isblank(c)) provokeLineFeed();
c = LXR_GETCHAR;
}
if(c == EOF) return initToken(&lxr_EOF, LXRE_EOF);
lexer.last = c;
} while(missComments());
lexer.start = lexer.col;
if(isdigit(c) || c == '.'){
lexer.last = tolower(LXR_GETCHAR);
if(c == '.' && !isdigit(lexer.last)){
if(lexer.last == '.'){
lexer.last = LXR_GETCHAR;
if(lexer.last != '.')
LXR_THROW_ERROR_FMT("Unrecognized token '..'. Did you mean '...'?%c", 0)
lexer.last = LXR_GETCHAR;
return initToken(NEW(Token), LXRE_ELLIPSIS);
}
else return initToken(NEW(Token), LXRE_DOT);
}
return readNum(c);
}
else if(isIdNondigit(c)) return readId();
else{
LXR_TokenType t = LXRE_TOKEN_INVALID;
lexer.last = LXR_GETCHAR;
bool q = c == lexer.last, w = lexer.last == '=', e = false;
#define LXR_OP1(x, a, b, c) \
case x: \
t = q ? LXRE_##a : w ? LXRE_##b##_##c : LXRE_##b;\
e = q||w; \
break
#define LXR_OP2(x, a) \
case x: \
t = w ? LXRE_##a##_ASSIGN : LXRE_##a; \
e = w; \
break
#define LXR_OP(x, a) case x: t = a; break
switch(c){
//case '#': LXR_THROW_ERROR_FMT("Unexpected macro%c", 0)
case '\'': case '\"':
return readString(c);
LXR_OP1('+', INCREASE, ADD, ASSIGN);
LXR_OP1('-', DECREASE, SUB, ASSIGN);
LXR_OP1('&', LOGICAL_AND, AND, ASSIGN);
LXR_OP1('|', LOGICAL_OR, OR, ASSIGN);
LXR_OP1('^', LOGICAL_XOR, XOR, ASSIGN);
LXR_OP1('<', SHL, LT, EQUAL);
LXR_OP1('>', SHR, GT, EQUAL);
LXR_OP2('/', DIV);
LXR_OP2('*', MULT);
LXR_OP2('%', MOD);
case '=':
t = w ? LXRE_EQ : LXRE_ASSIGN;
e = w;
break;
LXR_OP('.', LXRE_DOT);
LXR_OP(',', LXRE_COMMA);
LXR_OP('!', LXRE_NOT);
LXR_OP('{', LXRE_LEFT_CURLY_BRACKET);
LXR_OP('}', LXRE_RIGHT_CURLY_BRACKET);
LXR_OP('[', LXRE_LEFT_SQUARE_BRACKET);
LXR_OP(']', LXRE_RIGHT_SQUARE_BRACKET);
LXR_OP('(', LXRE_LEFT_ROUND_BRACKET);
LXR_OP(')', LXRE_RIGHT_ROUND_BRACKET);
LXR_OP(';', LXRE_SEMICOLON);
LXR_OP('~', LXRE_TILDA);
LXR_OP(':', LXRE_COLON);
LXR_OP('?', LXRE_QUESTION);
default:
LXR_THROW_ERROR_FMT("Unrecognized symbol '%c'", c);
}
if(e){
lexer.last = LXR_GETCHAR;
if((c == '<' || c == '>') && lexer.last == '=')
t = c == '<' ? LXRE_SHL_ASSIGN : LXRE_SHR_ASSIGN;
} else if (c == '-' && lexer.last == '>'){
lexer.last = LXR_GETCHAR;
t = LXRE_ARROW;
}
return initToken(NEW(Token), t);
}
}
void lxr_initLexer(FILE *f){
lexer.f = f;
lexer.str = 1;
lexer.col = 0;
lexer.last = LXR_GETCHAR;
}
void lxr_deinitializeLexer(){
fclose(lexer.f);
}
char* lxr_opTokenValues[LXRE_VALID_TOKENS_COUNT] = {
"->", ".", "(", "[", "++", "--", "!", "~", "&", "+", "-", "*",
"/", "%", "<<", ">>", "<", ">", "<=", ">=", "==",
"^", "|", "&&", "^^", "||",
",",
"=", "+=", "-=", "/=", "*=", "%=", "&=", "|=", "^=",
"<<=", ">>=",
"?", ":", "...", ";",
"{", "}", "]", ")",
0, 0, 0, 0,
"auto", "break", "case", "char", "const", "continue",
"default", "do", "double", "else", "enum", "extern",
"float", "for", "goto", "if", "inline", "int", "long",
"register", "restrict", "return", "short", "signed",
"sizeof", "static", "struct", "switch", "typedef",
"union", "unsigned", "void", "volatile", "while",
};
int lxr_runtest(char *filename, FILE *f, bool printDebug){
if(f == NULL){
printf("%s: no such file or directory\n", filename);
exit(1);
}
lxr_initLexer(f);
LXR_TokenPtr t = NULL;
while((t = lxr_nextToken()) != &lxr_EOF) if(printDebug){
printf("%s:%d:%d: ", filename, t->line, t->col);
switch(t->type){
case LXRE_IDENTIFIER:
printf("identifier | '%s'", LXR_GETBUF(t));
break;
case LXRE_INT_CONST:
printf("int | '%s' | %d", LXR_GETBUF(t), LXR_GET_INT_VAL(t));
break;
case LXRE_FLOAT_CONST:
printf("float | '%s' | %.12f", LXR_GETBUF(t), LXR_GET_FLOAT_VAL(t));
break;
case LXRE_TOKEN_INVALID:
printf("Invalid token | %s", LXR_GETBUF(t));
break;
case LXRE_STRING_CONST:
printf("string constant | \"%s\"", LXR_GETBUF(t));
break;
default:
assert(t->type < LXRE_VALID_TOKENS_COUNT);
char *typestr = LXR_IS_IN_OP_CLASS(t, KEYWORDS) ? "keyword" : "operator";
printf("%s token | '%s'", typestr, lxr_opTokenValues[t->type]);
}
printf("\n");
}
lxr_deinitializeLexer();
return 0;
}
#ifdef CCC_TEST
int main(int argc, char **argv){
for(int i = 1; i < argc; i++){
bool printDebug = strcmp(argv[i], "--no-debug-print");
if(!printDebug) i++;
lxr_runtest(argv[i], fopen(argv[i], "r"), printDebug);
}
return 0;
}
#endif