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cxx98.re
// re2c $INPUT -o $OUTPUT -i #include <assert.h> #include <float.h> #include <limits.h> #include <stdio.h> #include <string.h> /*!max:re2c*/ static const size_t SIZE = 64 * 1024; struct input_t { unsigned char buf[SIZE + YYMAXFILL]; unsigned char *lim; unsigned char *cur; unsigned char *mar; unsigned char *tok; bool eof; FILE *const file; input_t(FILE *f) : buf() , lim(buf + SIZE) , cur(lim) , mar(lim) , tok(lim) , eof(false) , file(f) {} bool fill(size_t need) { if (eof) { return false; } const size_t free = tok - buf; if (free < need) { return false; } memmove(buf, tok, lim - tok); lim -= free; cur -= free; mar -= free; tok -= free; lim += fread(lim, 1, free, file); if (lim < buf + SIZE) { eof = true; memset(lim, 0, YYMAXFILL); lim += YYMAXFILL; } return true; } }; /*!re2c re2c:define:YYCTYPE = "unsigned char"; */ template<int base> static bool adddgt(unsigned long &u, unsigned long d) { if (u > (ULONG_MAX - d) / base) { return false; } u = u * base + d; return true; } static bool lex_oct(const unsigned char *s, const unsigned char *e, unsigned long &u) { for (u = 0, ++s; s < e; ++s) { if (!adddgt<8>(u, *s - 0x30u)) { return false; } } return true; } static bool lex_dec(const unsigned char *s, const unsigned char *e, unsigned long &u) { for (u = 0; s < e; ++s) { if (!adddgt<10>(u, *s - 0x30u)) { return false; } } return true; } static bool lex_hex(const unsigned char *s, const unsigned char *e, unsigned long &u) { for (u = 0, s += 2; s < e;) { /*!re2c re2c:yyfill:enable = 0; re2c:define:YYCURSOR = s; * { if (!adddgt<16>(u, s[-1] - 0x30u)) return false; continue; } [a-f] { if (!adddgt<16>(u, s[-1] - 0x61u + 10)) return false; continue; } [A-F] { if (!adddgt<16>(u, s[-1] - 0x41u + 10)) return false; continue; } */ } return true; } static bool lex_str(input_t &in, unsigned char q) { fprintf(stderr, "%c", q); for (unsigned long u = q;; fprintf(stderr, "\\x%lx", u)) { in.tok = in.cur; /*!re2c re2c:yyfill:enable = 1; re2c:define:YYCURSOR = in.cur; re2c:define:YYMARKER = in.mar; re2c:define:YYLIMIT = in.lim; re2c:define:YYFILL = "if (!in.fill(@@)) return false;"; re2c:define:YYFILL:naked = 1; * { return false; } [^\n\\] { u = in.tok[0]; if (u == q) break; continue; } "\\a" { u = '\a'; continue; } "\\b" { u = '\b'; continue; } "\\f" { u = '\f'; continue; } "\\n" { u = '\n'; continue; } "\\r" { u = '\r'; continue; } "\\t" { u = '\t'; continue; } "\\v" { u = '\v'; continue; } "\\\\" { u = '\\'; continue; } "\\'" { u = '\''; continue; } "\\\"" { u = '"'; continue; } "\\?" { u = '?'; continue; } "\\" [0-7]{1,3} { lex_oct(in.tok, in.cur, u); continue; } "\\u" [0-9a-fA-F]{4} { lex_hex(in.tok, in.cur, u); continue; } "\\U" [0-9a-fA-F]{8} { lex_hex(in.tok, in.cur, u); continue; } "\\x" [0-9a-fA-F]+ { if (!lex_hex(in.tok, in.cur, u)) return false; continue; } */ } fprintf(stderr, "%c", q); return true; } static bool lex_flt(const unsigned char *s) { double d = 0; double x = 1; int e = 0; /*!re2c re2c:yyfill:enable = 0; re2c:define:YYCURSOR = s; */ mant_int: /*!re2c "." { goto mant_frac; } [eE] { goto exp_sign; } * { d = (d * 10) + (s[-1] - '0'); goto mant_int; } */ mant_frac: /*!re2c "" { goto sfx; } [eE] { goto exp_sign; } [0-9] { d += (x /= 10) * (s[-1] - '0'); goto mant_frac; } */ exp_sign: /*!re2c "+"? { x = 1e+1; goto exp; } "-" { x = 1e-1; goto exp; } */ exp: /*!re2c "" { for (; e > 0; --e) d *= x; goto sfx; } [0-9] { e = (e * 10) + (s[-1] - '0'); goto exp; } */ sfx: /*!re2c * { goto end; } [fF] { if (d > FLT_MAX) return false; goto end; } */ end: fprintf(stderr, "%g", d); return true; } static bool lex(input_t &in) { unsigned long u; for (;;) { in.tok = in.cur; /*!re2c re2c:yyfill:enable = 1; re2c:define:YYCURSOR = in.cur; re2c:define:YYMARKER = in.mar; re2c:define:YYLIMIT = in.lim; re2c:define:YYFILL = "if (!in.fill(@@)) return false;"; re2c:define:YYFILL:naked = 1; end = "\x00"; * { return false; } end { fprintf(stderr, "\n"); return in.lim - in.tok == YYMAXFILL; } // macros macro = ("#" | "%:") ([^\n] | "\\\n")* "\n"; macro { continue; } // whitespaces mcm = "/*" ([^*] | ("*" [^/]))* "*""/"; scm = "//" [^\n]* "\n"; wsp = ([ \t\v\n\r] | scm | mcm)+; wsp { fprintf(stderr, " "); continue; } // character and string literals "L"? ['"] { if (!lex_str(in, in.cur[-1])) return false; continue; } "L"? "''" { return false; } // integer literals oct = "0" [0-7]*; dec = [1-9][0-9]*; hex = '0x' [0-9a-fA-F]+; oct { if (!lex_oct(in.tok, in.cur, u)) return false; goto sfx; } dec { if (!lex_dec(in.tok, in.cur, u)) return false; goto sfx; } hex { if (!lex_hex(in.tok, in.cur, u)) return false; goto sfx; } // floating literals frc = [0-9]* "." [0-9]+ | [0-9]+ "."; exp = 'e' [+-]? [0-9]+; flt = (frc exp? | [0-9]+ exp) [fFlL]?; flt { if (lex_flt(in.tok)) continue; return false; } // boolean literals "false" { fprintf(stderr, "false"); continue; } "true" { fprintf(stderr, "true"); continue; } // keywords "asm" { fprintf(stderr, "ASM"); continue; } "auto" { fprintf(stderr, "AUTO"); continue; } "bool" { fprintf(stderr, "BOOL"); continue; } "break" { fprintf(stderr, "BREAK"); continue; } "case" { fprintf(stderr, "CASE"); continue; } "catch" { fprintf(stderr, "CATCH"); continue; } "char" { fprintf(stderr, "CHAR"); continue; } "class" { fprintf(stderr, "CLASS"); continue; } "const" { fprintf(stderr, "CONST"); continue; } "const_cast" { fprintf(stderr, "CONST_CAST"); continue; } "continue" { fprintf(stderr, "CONTINUE"); continue; } "default" { fprintf(stderr, "DEFAULT"); continue; } "do" { fprintf(stderr, "DO"); continue; } "double" { fprintf(stderr, "DOUBLE"); continue; } "dynamic_cast" { fprintf(stderr, "DYNAMIC_CAST"); continue; } "else" { fprintf(stderr, "ELSE"); continue; } "enum" { fprintf(stderr, "ENUM"); continue; } "explicit" { fprintf(stderr, "EXPLICIT"); continue; } "export" { fprintf(stderr, "EXPORT"); continue; } "extern" { fprintf(stderr, "EXTERN"); continue; } "float" { fprintf(stderr, "FLOAT"); continue; } "for" { fprintf(stderr, "FOR"); continue; } "friend" { fprintf(stderr, "FRIEND"); continue; } "goto" { fprintf(stderr, "GOTO"); continue; } "if" { fprintf(stderr, "IF"); continue; } "inline" { fprintf(stderr, "INLINE"); continue; } "int" { fprintf(stderr, "INT"); continue; } "long" { fprintf(stderr, "LONG"); continue; } "mutable" { fprintf(stderr, "MUTABLE"); continue; } "namespace" { fprintf(stderr, "NAMESPACE"); continue; } "operator" { fprintf(stderr, "OPERATOR"); continue; } "private" { fprintf(stderr, "PRIVATE"); continue; } "protected" { fprintf(stderr, "PROTECTED"); continue; } "public" { fprintf(stderr, "PUBLIC"); continue; } "register" { fprintf(stderr, "REGISTER"); continue; } "reinterpret_cast" { fprintf(stderr, "REINTERPRET_CAST"); continue; } "return" { fprintf(stderr, "RETURN"); continue; } "short" { fprintf(stderr, "SHORT"); continue; } "signed" { fprintf(stderr, "SIGNED"); continue; } "sizeof" { fprintf(stderr, "SIZEOF"); continue; } "static" { fprintf(stderr, "STATIC"); continue; } "static_cast" { fprintf(stderr, "STATIC_CAST"); continue; } "struct" { fprintf(stderr, "STRUCT"); continue; } "switch" { fprintf(stderr, "SWITCH"); continue; } "template" { fprintf(stderr, "TEMPLATE"); continue; } "this" { fprintf(stderr, "THIS"); continue; } "throw" { fprintf(stderr, "THROW"); continue; } "try" { fprintf(stderr, "TRY"); continue; } "typedef" { fprintf(stderr, "TYPEDEF"); continue; } "typeid" { fprintf(stderr, "TYPEID"); continue; } "typename" { fprintf(stderr, "TYPENAME"); continue; } "union" { fprintf(stderr, "UNION"); continue; } "unsigned" { fprintf(stderr, "UNSIGNED"); continue; } "using" { fprintf(stderr, "USING"); continue; } "virtual" { fprintf(stderr, "VIRTUAL"); continue; } "void" { fprintf(stderr, "VOID"); continue; } "volatile" { fprintf(stderr, "VOLATILE"); continue; } "wchar_t" { fprintf(stderr, "WCHAR_T"); continue; } "while" { fprintf(stderr, "WHILE"); continue; } // operators and punctuation (including preprocessor) ("{" | "<%") { fprintf(stderr, "{"); continue; } ("}" | "%>") { fprintf(stderr, "}"); continue; } ("[" | "<:") { fprintf(stderr, "["); continue; } ("]" | ":>") { fprintf(stderr, "]"); continue; } "(" { fprintf(stderr, "("); continue; } ")" { fprintf(stderr, ")"); continue; } ";" { fprintf(stderr, ";"); continue; } ":" { fprintf(stderr, ":"); continue; } "..." { fprintf(stderr, "..."); continue; } "new" { fprintf(stderr, "new"); continue; } "delete" { fprintf(stderr, "delete"); continue; } "?" { fprintf(stderr, "?"); continue; } "::" { fprintf(stderr, "::"); continue; } "." { fprintf(stderr, "."); continue; } ".*" { fprintf(stderr, "."); continue; } "+" { fprintf(stderr, "+"); continue; } "-" { fprintf(stderr, "-"); continue; } "*" { fprintf(stderr, "*"); continue; } "/" { fprintf(stderr, "/"); continue; } "%" { fprintf(stderr, "%%"); continue; } ("^" | "xor") { fprintf(stderr, "^"); continue; } ("&" | "bitand") { fprintf(stderr, "&"); continue; } ("|" | "bitor") { fprintf(stderr, "|"); continue; } ("~" | "compl") { fprintf(stderr, "~"); continue; } ("!" | "not") { fprintf(stderr, "!"); continue; } "=" { fprintf(stderr, "="); continue; } "<" { fprintf(stderr, "<"); continue; } ">" { fprintf(stderr, ">"); continue; } "+=" { fprintf(stderr, "+="); continue; } "-=" { fprintf(stderr, "-="); continue; } "*=" { fprintf(stderr, "*="); continue; } "/=" { fprintf(stderr, "/="); continue; } "%=" { fprintf(stderr, "%%="); continue; } ("^=" | "xor_eq") { fprintf(stderr, "^="); continue; } ("&=" | "and_eq") { fprintf(stderr, "&="); continue; } ("|=" | "or_eq") { fprintf(stderr, "|="); continue; } "<<" { fprintf(stderr, "<<"); continue; } ">>" { fprintf(stderr, ">>"); continue; } ">>=" { fprintf(stderr, ">>="); continue; } "<<=" { fprintf(stderr, "<<="); continue; } "==" { fprintf(stderr, "=="); continue; } ("!=" | "not_eq") { fprintf(stderr, "!="); continue; } "<=" { fprintf(stderr, "<="); continue; } ">=" { fprintf(stderr, ">="); continue; } ("&&" | "and") { fprintf(stderr, "&&"); continue; } ("||" | "or") { fprintf(stderr, "||"); continue; } "++" { fprintf(stderr, "++"); continue; } "--" { fprintf(stderr, "--"); continue; } "," { fprintf(stderr, ","); continue; } "->*" { fprintf(stderr, "->*"); continue; } "->" { fprintf(stderr, "->"); continue; } // identifiers id = [a-zA-Z_][a-zA-Z_0-9]*; id { fprintf(stderr, "%.*s", (int)(in.cur - in.tok), in.tok); continue; } */ sfx: /*!re2c "" { if (u > INT_MAX) return false; fprintf(stderr, "%d", static_cast<int>(u)); continue; } 'u' { if (u > UINT_MAX) return false; fprintf(stderr, "%u", static_cast<unsigned>(u)); continue; } 'l' { if (u > LONG_MAX) return false; fprintf(stderr, "%ld", static_cast<long>(u)); continue; } 'ul' | 'lu' { fprintf(stderr, "%lu", u); continue; } */ } } int main() { const char *fname = "example.cpp"; FILE *f; // prepare input file f = fopen(fname, "w"); fprintf(f, "#include<stdio.h>\n" "\n" "int main()\n" "{\n" " int n;\n" " printf(\"Enter the number:\\n\");\n" " scanf(\"%%d\", &n);\n" "\n" " int f = 1;\n" " for(int i = 1; i <= n; ++i) {\n" " f *= i;\n" " }\n" "\n" " printf(\"Factorial of %%d is %%d\\n\", n, f);\n" " return 0;\n" "}\n" "\n"); fclose(f); f = fopen(fname, "rb"); input_t in(f); assert(lex(in)); fclose(f); // cleanup remove(fname); return 0; }