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43abfba723
re2c instead of "Linking X". - Updated lemon and re2c to the latest versions and ported dehsupp to use them for code generation. (Xlatcc is next.) - Added function level linking for Makefile.mingw. SVN r144 (trunk)
368 lines
7.5 KiB
C++
368 lines
7.5 KiB
C++
/* $Id: scanner.re,v 1.42 2006/04/17 00:18:45 helly Exp $ */
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#include <stdlib.h>
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#include <string.h>
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#include <iostream>
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#include <sstream>
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#include "scanner.h"
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#include "parser.h"
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#include "y.tab.h"
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#include "globals.h"
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#include "dfa.h"
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extern YYSTYPE yylval;
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#ifndef MAX
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#define MAX(a,b) (((a)>(b))?(a):(b))
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#endif
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#define BSIZE 8192
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#define YYCTYPE char
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#define YYCURSOR cursor
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#define YYLIMIT lim
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#define YYMARKER ptr
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#define YYFILL(n) {cursor = fill(cursor);}
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#define RETURN(i) {cur = cursor; return i;}
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namespace re2c
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{
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Scanner::Scanner(const char *fn, std::istream& i, std::ostream& o)
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: in(i)
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, out(o)
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, bot(NULL), tok(NULL), ptr(NULL), cur(NULL), pos(NULL), lim(NULL)
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, top(NULL), eof(NULL), tchar(0), tline(0), cline(1), iscfg(0)
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, filename(fn)
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{
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;
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}
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char *Scanner::fill(char *cursor)
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{
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if(!eof)
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{
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uint cnt = tok - bot;
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if(cnt)
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{
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memcpy(bot, tok, lim - tok);
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tok = bot;
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ptr -= cnt;
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cursor -= cnt;
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pos -= cnt;
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lim -= cnt;
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}
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if((top - lim) < BSIZE)
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{
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char *buf = new char[(lim - bot) + BSIZE];
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memcpy(buf, tok, lim - tok);
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tok = buf;
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ptr = &buf[ptr - bot];
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cursor = &buf[cursor - bot];
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pos = &buf[pos - bot];
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lim = &buf[lim - bot];
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top = &lim[BSIZE];
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delete [] bot;
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bot = buf;
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}
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in.read(lim, BSIZE);
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if ((cnt = in.gcount()) != BSIZE )
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{
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eof = &lim[cnt]; *eof++ = '\0';
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}
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lim += cnt;
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}
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return cursor;
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}
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/*!re2c
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zero = "\000";
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any = [\000-\377];
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dot = any \ [\n];
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esc = dot \ [\\];
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istring = "[" "^" ((esc \ [\]]) | "\\" dot)* "]" ;
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cstring = "[" ((esc \ [\]]) | "\\" dot)* "]" ;
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dstring = "\"" ((esc \ ["] ) | "\\" dot)* "\"";
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sstring = "'" ((esc \ ['] ) | "\\" dot)* "'" ;
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letter = [a-zA-Z];
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digit = [0-9];
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number = "0" | ("-"? [1-9] digit*);
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name = letter (letter|digit)*;
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cname = ":" letter (letter|digit|"_")*;
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space = [ \t];
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eol = ("\r\n" | "\n");
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config = "re2c" cname+;
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value = [^\r\n; \t]* | dstring | sstring;
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*/
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int Scanner::echo()
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{
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char *cursor = cur;
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bool ignore_eoc = false;
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int ignore_cnt = 0;
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if (eof && cursor == eof) // Catch EOF
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{
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return 0;
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}
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tok = cursor;
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echo:
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/*!re2c
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"/*!re2c" {
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if (bUsedYYMaxFill && bSinglePass) {
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fatal("found scanner block after YYMAXFILL declaration");
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}
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out.write((const char*)(tok), (const char*)(&cursor[-7]) - (const char*)(tok));
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tok = cursor;
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RETURN(1);
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}
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"/*!max:re2c" {
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if (bUsedYYMaxFill) {
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fatal("cannot generate YYMAXFILL twice");
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}
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out << "#define YYMAXFILL " << maxFill << std::endl;
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tok = pos = cursor;
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ignore_eoc = true;
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bUsedYYMaxFill = true;
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goto echo;
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}
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"/*!getstate:re2c" {
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tok = pos = cursor;
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genGetState(out, topIndent, 0);
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ignore_eoc = true;
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goto echo;
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}
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"/*!ignore:re2c" {
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tok = pos = cursor;
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ignore_eoc = true;
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goto echo;
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}
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"*" "/" "\r"? "\n" {
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cline++;
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if (ignore_eoc) {
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if (ignore_cnt) {
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out << sourceFileInfo;
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}
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ignore_eoc = false;
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ignore_cnt = 0;
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} else {
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out.write((const char*)(tok), (const char*)(cursor) - (const char*)(tok));
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}
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tok = pos = cursor;
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goto echo;
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}
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"*" "/" {
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if (ignore_eoc) {
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if (ignore_cnt) {
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out << "\n" << sourceFileInfo;
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}
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ignore_eoc = false;
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ignore_cnt = 0;
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} else {
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out.write((const char*)(tok), (const char*)(cursor) - (const char*)(tok));
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}
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tok = pos = cursor;
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goto echo;
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}
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"\n" {
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if (ignore_eoc) {
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ignore_cnt++;
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} else {
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out.write((const char*)(tok), (const char*)(cursor) - (const char*)(tok));
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}
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tok = pos = cursor; cline++;
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goto echo;
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}
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zero {
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if (!ignore_eoc) {
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out.write((const char*)(tok), (const char*)(cursor) - (const char*)(tok) - 1); // -1 so we don't write out the \0
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}
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if(cursor == eof) {
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RETURN(0);
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}
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}
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any {
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goto echo;
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}
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*/
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}
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int Scanner::scan()
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{
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char *cursor = cur;
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uint depth;
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scan:
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tchar = cursor - pos;
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tline = cline;
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tok = cursor;
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if (iscfg == 1)
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{
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goto config;
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}
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else if (iscfg == 2)
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{
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goto value;
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}
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/*!re2c
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"{" { depth = 1;
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goto code;
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}
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"/*" { depth = 1;
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goto comment; }
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"*/" { tok = cursor;
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RETURN(0); }
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dstring { cur = cursor;
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yylval.regexp = strToRE(token());
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return STRING; }
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sstring { cur = cursor;
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yylval.regexp = strToCaseInsensitiveRE(token());
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return STRING; }
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"\"" { fatal("unterminated string constant (missing \")"); }
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"'" { fatal("unterminated string constant (missing ')"); }
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istring { cur = cursor;
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yylval.regexp = invToRE(token());
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return RANGE; }
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cstring { cur = cursor;
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yylval.regexp = ranToRE(token());
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return RANGE; }
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"[" { fatal("unterminated range (missing ])"); }
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[()|=;/\\] { RETURN(*tok); }
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[*+?] { yylval.op = *tok;
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RETURN(CLOSE); }
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"{0,}" { yylval.op = '*';
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RETURN(CLOSE); }
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"{" [0-9]+ "}" { yylval.extop.minsize = atoi((char *)tok+1);
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yylval.extop.maxsize = atoi((char *)tok+1);
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RETURN(CLOSESIZE); }
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"{" [0-9]+ "," [0-9]+ "}" { yylval.extop.minsize = atoi((char *)tok+1);
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yylval.extop.maxsize = MAX(yylval.extop.minsize,atoi(strchr((char *)tok, ',')+1));
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RETURN(CLOSESIZE); }
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"{" [0-9]+ ",}" { yylval.extop.minsize = atoi((char *)tok+1);
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yylval.extop.maxsize = -1;
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RETURN(CLOSESIZE); }
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"{" [0-9]* "," { fatal("illegal closure form, use '{n}', '{n,}', '{n,m}' where n and m are numbers"); }
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config { cur = cursor;
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tok+= 5; /* skip "re2c:" */
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iscfg = 1;
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yylval.str = new Str(token());
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return CONFIG;
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}
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name { cur = cursor;
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yylval.symbol = Symbol::find(token());
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return ID; }
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"." { cur = cursor;
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yylval.regexp = mkDot();
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return RANGE;
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}
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space+ { goto scan; }
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eol { if(cursor == eof) RETURN(0);
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pos = cursor; cline++;
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goto scan;
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}
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any { std::ostringstream msg;
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msg << "unexpected character: ";
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prtChOrHex(msg, *tok);
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fatal(msg.str().c_str());
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goto scan;
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}
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*/
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code:
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/*!re2c
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"}" { if(--depth == 0){
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cur = cursor;
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yylval.token = new Token(token(), tline);
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return CODE;
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}
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goto code; }
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"{" { ++depth;
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goto code; }
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"\n" { if(cursor == eof) fatal("missing '}'");
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pos = cursor; cline++;
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goto code;
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}
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dstring | sstring | any { goto code; }
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*/
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comment:
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/*!re2c
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"*/" { if(--depth == 0)
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goto scan;
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else
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goto comment; }
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"/*" { ++depth;
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fatal("ambiguous /* found");
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goto comment; }
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"\n" { if(cursor == eof) RETURN(0);
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tok = pos = cursor; cline++;
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goto comment;
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}
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any { if(cursor == eof) RETURN(0);
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goto comment; }
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*/
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config:
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/*!re2c
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space+ { goto config; }
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"=" space* { iscfg = 2;
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cur = cursor;
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RETURN('=');
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}
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any { fatal("missing '='"); }
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*/
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value:
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/*!re2c
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number { cur = cursor;
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yylval.number = atoi(token().to_string().c_str());
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iscfg = 0;
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return NUMBER;
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}
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value { cur = cursor;
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yylval.str = new Str(token());
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iscfg = 0;
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return VALUE;
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}
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*/
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}
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void Scanner::fatal(uint ofs, const char *msg) const
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{
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out.flush();
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#ifdef _MSC_VER
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std::cerr << filename << "(" << tline << "): error : "
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<< "column " << (tchar + ofs + 1) << ": "
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<< msg << std::endl;
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#else
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std::cerr << "re2c: error: "
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<< "line " << tline << ", column " << (tchar + ofs + 1) << ": "
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<< msg << std::endl;
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#endif
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exit(1);
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}
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} // end namespace re2c
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