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|
/* Generated by re2c */
#line 1 "push.fg.re"
/*
* A push-model scanner example for re2c -f
* Written Mon Apr 11 2005 by mgix@mgix.com
* This file is in the public domain.
*
*/
// ----------------------------------------------------------------------
#include <fcntl.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#if defined(WIN32)
typedef signed char int8_t;
typedef signed short int16_t;
typedef signed int int32_t;
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
#else
#include <stdint.h>
#include <unistd.h>
#ifndef O_BINARY
#define O_BINARY 0
#endif
#endif
// ----------------------------------------------------------------------
#define TOKENS \
\
TOK(kEOF) \
TOK(kEOL) \
TOK(kUnknown) \
TOK(kIdentifier) \
TOK(kDecimalConstant) \
\
TOK(kEqual) \
TOK(kLeftParen) \
TOK(kRightParen) \
TOK(kMinus) \
TOK(kPlus) \
TOK(kStar) \
TOK(kSlash) \
\
TOK(kIf) \
TOK(kFor) \
TOK(kElse) \
TOK(kGoto) \
TOK(kBreak) \
TOK(kWhile) \
TOK(kReturn) \
// ----------------------------------------------------------------------
static const char *tokenNames[] =
{
#define TOK(x) #x,
TOKENS
#undef TOK
};
// ----------------------------------------------------------------------
class PushScanner
{
public:
enum Token
{
#define TOK(x) x,
TOKENS
#undef TOK
};
private:
bool eof;
int32_t state;
uint8_t *limit;
uint8_t *start;
uint8_t *cursor;
uint8_t *marker;
uint8_t *buffer;
uint8_t *bufferEnd;
uint8_t yych;
uint32_t yyaccept;
public:
// ----------------------------------------------------------------------
PushScanner()
{
limit = 0;
start = 0;
state = -1;
cursor = 0;
marker = 0;
buffer = 0;
eof = false;
bufferEnd = 0;
}
// ----------------------------------------------------------------------
~PushScanner()
{
}
// ----------------------------------------------------------------------
void send(
Token token
)
{
size_t tokenSize = cursor-start;
const char *tokenName = tokenNames[token];
printf(
"scanner is pushing out a token of type %d (%s)",
token,
tokenName
);
if(token==kEOF) putchar('\n');
else
{
size_t tokenNameSize = strlen(tokenNames[token]);
size_t padSize = 20-(20<tokenNameSize ? 20 : tokenNameSize);
for(size_t i=0; i<padSize; ++i) putchar(' ');
printf(" : ---->");
fwrite(
start,
tokenSize,
1,
stdout
);
printf("<----\n");
}
}
// ----------------------------------------------------------------------
uint32_t push(
const void *input,
ssize_t inputSize
)
{
printf(
"scanner is receiving a new data batch of length %d\n"
"scanner continues with saved state = %d\n",
inputSize,
state
);
/*
* Data source is signaling end of file when batch size
* is less than maxFill. This is slightly annoying because
* maxFill is a value that can only be known after re2c does
* its thing. Practically though, maxFill is never bigger than
* the longest keyword, so given our grammar, 32 is a safe bet.
*/
uint8_t null[64];
const ssize_t maxFill = 32;
if(inputSize<maxFill)
{
eof = true;
input = null;
inputSize = sizeof(null);
memset(null, 0, sizeof(null));
}
/*
* When we get here, we have a partially
* consumed buffer which is in the following state:
* last valid char last valid buffer spot
* v v
* +-------------------+-------------+---------------+-------------+----------------------+
* ^ ^ ^ ^ ^ ^
* buffer start marker cursor limit bufferEnd
*
* We need to stretch the buffer and concatenate the new chunk of input to it
*
*/
size_t used = limit-buffer;
size_t needed = used+inputSize;
size_t allocated = bufferEnd-buffer;
if(allocated<needed)
{
size_t limitOffset = limit-buffer;
size_t startOffset = start-buffer;
size_t markerOffset = marker-buffer;
size_t cursorOffset = cursor-buffer;
buffer = (uint8_t*)realloc(buffer, needed);
bufferEnd = needed+buffer;
marker = markerOffset + buffer;
cursor = cursorOffset + buffer;
start = buffer + startOffset;
limit = limitOffset + buffer;
}
memcpy(limit, input, inputSize);
limit += inputSize;
// The scanner starts here
#define YYLIMIT limit
#define YYCURSOR cursor
#define YYMARKER marker
#define YYCTYPE uint8_t
#define SKIP(x) { start = cursor; goto yy0; }
#define SEND(x) { send(x); SKIP(); }
#define YYFILL(n) { goto fill; }
#define YYGETSTATE() state
#define YYSETSTATE(x) { state = (x); }
start:
#line 233 "push.fg.c"
{
static const unsigned char yybm[] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
192, 192, 192, 192, 192, 192, 192, 192,
192, 192, 0, 0, 0, 0, 0, 0,
0, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 0, 0, 0, 0, 128,
0, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
};
switch (YYGETSTATE()) {
default: goto yy0;
case 0: goto yyFillLabel0;
case 1: goto yyFillLabel1;
case 2: goto yyFillLabel2;
}
yy0:
YYSETSTATE(0);
if ((YYLIMIT - YYCURSOR) < 7) YYFILL(7);
yyFillLabel0:
yych = *YYCURSOR;
{
static void *yytarget[256] = {
&&yy2, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy6, &&yy8, &&yy6, &&yy6, &&yy6, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy6, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy10, &&yy12, &&yy14, &&yy16, &&yy4, &&yy18, &&yy4, &&yy20,
&&yy22, &&yy22, &&yy22, &&yy22, &&yy22, &&yy22, &&yy22, &&yy22,
&&yy22, &&yy22, &&yy4, &&yy4, &&yy4, &&yy25, &&yy4, &&yy4,
&&yy4, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27,
&&yy27, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27,
&&yy27, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27,
&&yy27, &&yy27, &&yy27, &&yy4, &&yy4, &&yy4, &&yy4, &&yy27,
&&yy4, &&yy27, &&yy30, &&yy27, &&yy27, &&yy31, &&yy32, &&yy33,
&&yy27, &&yy34, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27, &&yy27,
&&yy27, &&yy27, &&yy35, &&yy27, &&yy27, &&yy27, &&yy27, &&yy36,
&&yy27, &&yy27, &&yy27, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4,
&&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4, &&yy4
};
goto *yytarget[yych];
}
yy2:
++YYCURSOR;
#line 259 "push.fg.re"
{ send(kEOF); return 1; }
#line 322 "push.fg.c"
yy4:
++YYCURSOR;
#line 260 "push.fg.re"
{ SEND(kUnknown); }
#line 327 "push.fg.c"
yy6:
++YYCURSOR;
#line 258 "push.fg.re"
{ SKIP(); }
#line 332 "push.fg.c"
yy8:
++YYCURSOR;
#line 257 "push.fg.re"
{ SKIP(); }
#line 337 "push.fg.c"
yy10:
++YYCURSOR;
#line 250 "push.fg.re"
{ SEND(kLeftParen); }
#line 342 "push.fg.c"
yy12:
++YYCURSOR;
#line 251 "push.fg.re"
{ SEND(kRightParen); }
#line 347 "push.fg.c"
yy14:
++YYCURSOR;
#line 254 "push.fg.re"
{ SEND(kStar); }
#line 352 "push.fg.c"
yy16:
++YYCURSOR;
#line 253 "push.fg.re"
{ SEND(kPlus); }
#line 357 "push.fg.c"
yy18:
++YYCURSOR;
#line 252 "push.fg.re"
{ SEND(kMinus); }
#line 362 "push.fg.c"
yy20:
++YYCURSOR;
#line 255 "push.fg.re"
{ SEND(kSlash); }
#line 367 "push.fg.c"
yy22:
++YYCURSOR;
YYSETSTATE(1);
if (YYLIMIT <= YYCURSOR) YYFILL(1);
yyFillLabel1:
yych = *YYCURSOR;
if (yybm[0+yych] & 64) {
goto yy22;
}
#line 247 "push.fg.re"
{ SEND(kDecimalConstant);}
#line 379 "push.fg.c"
yy25:
++YYCURSOR;
#line 249 "push.fg.re"
{ SEND(kEqual); }
#line 384 "push.fg.c"
yy27:
++YYCURSOR;
YYSETSTATE(2);
if (YYLIMIT <= YYCURSOR) YYFILL(1);
yyFillLabel2:
yych = *YYCURSOR;
yy28:
if (yybm[0+yych] & 128) {
goto yy27;
}
#line 246 "push.fg.re"
{ SEND(kIdentifier); }
#line 397 "push.fg.c"
yy30:
yych = *++YYCURSOR;
if (yych == 'r') goto yy37;
goto yy28;
yy31:
yych = *++YYCURSOR;
if (yych == 'l') goto yy38;
goto yy28;
yy32:
yych = *++YYCURSOR;
if (yych == 'o') goto yy39;
goto yy28;
yy33:
yych = *++YYCURSOR;
if (yych == 'o') goto yy40;
goto yy28;
yy34:
yych = *++YYCURSOR;
if (yych == 'f') goto yy41;
goto yy28;
yy35:
yych = *++YYCURSOR;
if (yych == 'e') goto yy43;
goto yy28;
yy36:
yych = *++YYCURSOR;
if (yych == 'h') goto yy44;
goto yy28;
yy37:
yych = *++YYCURSOR;
if (yych == 'e') goto yy45;
goto yy28;
yy38:
yych = *++YYCURSOR;
if (yych == 's') goto yy46;
goto yy28;
yy39:
yych = *++YYCURSOR;
if (yych == 'r') goto yy47;
goto yy28;
yy40:
yych = *++YYCURSOR;
if (yych == 't') goto yy49;
goto yy28;
yy41:
yych = *++YYCURSOR;
if (yybm[0+yych] & 128) {
goto yy27;
}
#line 239 "push.fg.re"
{ SEND(kIf); }
#line 449 "push.fg.c"
yy43:
yych = *++YYCURSOR;
if (yych == 't') goto yy50;
goto yy28;
yy44:
yych = *++YYCURSOR;
if (yych == 'i') goto yy51;
goto yy28;
yy45:
yych = *++YYCURSOR;
if (yych == 'a') goto yy52;
goto yy28;
yy46:
yych = *++YYCURSOR;
if (yych == 'e') goto yy53;
goto yy28;
yy47:
yych = *++YYCURSOR;
if (yybm[0+yych] & 128) {
goto yy27;
}
#line 240 "push.fg.re"
{ SEND(kFor); }
#line 473 "push.fg.c"
yy49:
yych = *++YYCURSOR;
if (yych == 'o') goto yy55;
goto yy28;
yy50:
yych = *++YYCURSOR;
if (yych == 'u') goto yy57;
goto yy28;
yy51:
yych = *++YYCURSOR;
if (yych == 'l') goto yy58;
goto yy28;
yy52:
yych = *++YYCURSOR;
if (yych == 'k') goto yy59;
goto yy28;
yy53:
yych = *++YYCURSOR;
if (yybm[0+yych] & 128) {
goto yy27;
}
#line 241 "push.fg.re"
{ SEND(kElse); }
#line 497 "push.fg.c"
yy55:
yych = *++YYCURSOR;
if (yybm[0+yych] & 128) {
goto yy27;
}
#line 242 "push.fg.re"
{ SEND(kGoto); }
#line 505 "push.fg.c"
yy57:
yych = *++YYCURSOR;
if (yych == 'r') goto yy61;
goto yy28;
yy58:
yych = *++YYCURSOR;
if (yych == 'e') goto yy62;
goto yy28;
yy59:
yych = *++YYCURSOR;
if (yybm[0+yych] & 128) {
goto yy27;
}
#line 243 "push.fg.re"
{ SEND(kBreak); }
#line 521 "push.fg.c"
yy61:
yych = *++YYCURSOR;
if (yych == 'n') goto yy64;
goto yy28;
yy62:
yych = *++YYCURSOR;
if (yybm[0+yych] & 128) {
goto yy27;
}
#line 244 "push.fg.re"
{ SEND(kWhile); }
#line 533 "push.fg.c"
yy64:
yych = *++YYCURSOR;
if (yybm[0+yych] & 128) {
goto yy27;
}
#line 245 "push.fg.re"
{ SEND(kReturn); }
#line 541 "push.fg.c"
}
#line 261 "push.fg.re"
fill:
ssize_t unfinishedSize = cursor-start;
printf(
"scanner needs a refill. Exiting for now with:\n"
" saved fill state = %d\n"
" unfinished token size = %d\n",
state,
unfinishedSize
);
if(0<unfinishedSize && start<limit)
{
printf(" unfinished token is :");
fwrite(start, 1, cursor-start, stdout);
putchar('\n');
}
putchar('\n');
/*
* Once we get here, we can get rid of
* everything before start and after limit.
*/
if(eof==true) goto start;
if(buffer<start)
{
size_t startOffset = start-buffer;
memmove(buffer, start, limit-start);
marker -= startOffset;
cursor -= startOffset;
limit -= startOffset;
start -= startOffset;
}
return 0;
}
};
// ----------------------------------------------------------------------
int main(
int argc,
char **argv
)
{
// Parse cmd line
int input = 0;
if(1<argc)
{
input = open(argv[1], O_RDONLY | O_BINARY);
if(input<0)
{
fprintf(
stderr,
"could not open file %s\n",
argv[1]
);
exit(1);
}
}
/*
* Tokenize input file by pushing batches
* of data one by one into the scanner.
*/
const size_t batchSize = 256;
uint8_t buffer[batchSize];
PushScanner scanner;
while(1)
{
ssize_t n = read(input, buffer, batchSize);
scanner.push(buffer, n);
if(n<batchSize) break;
}
scanner.push(0, -1);
close(input);
// Done
return 0;
}
re2c: warning: line 237: column 22: escape has no effect: '\h' [-Wuseless-escape]
|
