#include "Python.h"

#include "pgenheaders.h"

#include <ctype.h>

#include <assert.h>

#include "tokenizer.h"

#include "errcode.h"

#ifndef PGEN

#include "unicodeobject.h"

#include "stringobject.h"

#include "fileobject.h"

#include "codecs.h"

#include "abstract.h"

#include "pydebug.h"

#endif /* PGEN */

extern char *PyOS_Readline(FILE *, FILE *, char *);

#define TABSIZE 8

static struct tok_state *tok_new(void);

static int tok_nextc(struct tok_state *tok);

static void tok_backup(struct tok_state *tok, int c);

char *_PyParser_TokenNames[] = {

"ENDMARKER",

"NAME",

"NUMBER",

"STRING",

"NEWLINE",

"INDENT",

"DEDENT",

"LPAR",

"RPAR",

"LSQB",

"RSQB",

"COLON",

"COMMA",

"SEMI",

"PLUS",

"MINUS",

"STAR",

"SLASH",

"VBAR",

"AMPER",

"LESS",

"GREATER",

"EQUAL",

"DOT",

"PERCENT",

"BACKQUOTE",

"LBRACE",

"RBRACE",

"EQEQUAL",

"NOTEQUAL",

"LESSEQUAL",

"GREATEREQUAL",

"TILDE",

"CIRCUMFLEX",

"LEFTSHIFT",

"RIGHTSHIFT",

"DOUBLESTAR",

"PLUSEQUAL",

"MINEQUAL",

"STAREQUAL",

"SLASHEQUAL",

"PERCENTEQUAL",

"AMPEREQUAL",

"VBAREQUAL",

"CIRCUMFLEXEQUAL",

"LEFTSHIFTEQUAL",

"RIGHTSHIFTEQUAL",

"DOUBLESTAREQUAL",

"DOUBLESLASH",

"DOUBLESLASHEQUAL",

"AT",

/* This table must match the #defines in token.h! */

"OP",

"<ERRORTOKEN>",

"<N_TOKENS>"

};

static struct tok_state *

tok_new(void)

{

struct tok_state *tok = (struct tok_state *)PyMem_MALLOC(

sizeof(struct tok_state));

if (tok == NULL)

return NULL;

tok->buf = tok->cur = tok->end = tok->inp = tok->start = NULL;

tok->done = E_OK;

tok->fp = NULL;

tok->tabsize = TABSIZE;

tok->indent = 0;

tok->indstack[0] = 0;

tok->atbol = 1;

tok->pendin = 0;

tok->prompt = tok->nextprompt = NULL;

tok->lineno = 0;

tok->level = 0;

tok->filename = NULL;

tok->altwarning = 0;

tok->alterror = 0;

tok->alttabsize = 1;

tok->altindstack[0] = 0;

tok->decoding_state = 0;

tok->decoding_erred = 0;

tok->read_coding_spec = 0;

tok->encoding = NULL;

tok->cont_line = 0;

#ifndef PGEN

tok->decoding_readline = NULL;

tok->decoding_buffer = NULL;

return tok;

}

#ifdef PGEN

static char *

decoding_fgets(char *s, int size, struct tok_state *tok)

{

return fgets(s, size, tok->fp);

}

static int

decoding_feof(struct tok_state *tok)

{

return feof(tok->fp);

}

static const char *

decode_str(const char *str, struct tok_state *tok)

{

return str;

}

#else /* PGEN */

static char *

error_ret(struct tok_state *tok) /* XXX */

{

tok->decoding_erred = 1;

if (tok->fp != NULL && tok->buf != NULL) /* see PyTokenizer_Free */

PyMem_FREE(tok->buf);

tok->buf = NULL;

return NULL; /* as if it were EOF */

}

static char *

new_string(const char *s, Py_ssize_t len)

{

char* result = (char *)PyMem_MALLOC(len + 1);

if (result != NULL) {

memcpy(result, s, len);

result[len] = '\0';

}

return result;

}

static char *

get_normal_name(char *s) /* for utf-8 and latin-1 */

{

char buf[13];

int i;

for (i = 0; i < 12; i++) {

int c = s[i];

if (c == '\0') break;

else if (c == '_') buf[i] = '-';

else buf[i] = tolower(c);

}

buf[i] = '\0';

if (strcmp(buf, "utf-8") == 0 ||

strncmp(buf, "utf-8-", 6) == 0) return "utf-8";

else if (strcmp(buf, "latin-1") == 0 ||

strcmp(buf, "iso-8859-1") == 0 ||

strcmp(buf, "iso-latin-1") == 0 ||

strncmp(buf, "latin-1-", 8) == 0 ||

strncmp(buf, "iso-8859-1-", 11) == 0 ||

strncmp(buf, "iso-latin-1-", 12) == 0) return "iso-8859-1";

else return s;

}

static char *

get_coding_spec(const char *s, Py_ssize_t size)

{

Py_ssize_t i;

/* Coding spec must be in a comment, and that comment must be

for (i = 0; i < size - 6; i++) {

if (s[i] == '#')

break;

if (s[i] != ' ' && s[i] != '\t' && s[i] != '\014')

return NULL;

}

for (; i < size - 6; i++) { /* XXX inefficient search */

const char* t = s + i;

if (strncmp(t, "coding", 6) == 0) {

const char* begin = NULL;

t += 6;

if (t[0] != ':' && t[0] != '=')

continue;

do {

t++;

} while (t[0] == '\x20' || t[0] == '\t');

begin = t;

while (isalnum(Py_CHARMASK(t[0])) ||

t[0] == '-' || t[0] == '_' || t[0] == '.')

t++;

if (begin < t) {

char* r = new_string(begin, t - begin);

char* q = get_normal_name(r);

if (r != q) {

PyMem_FREE(r);

r = new_string(q, strlen(q));

}

return r;

}

}

}

return NULL;

}

static int

check_coding_spec(const char* line, Py_ssize_t size, struct tok_state *tok,

int set_readline(struct tok_state *, const char *))

{

char * cs;

int r = 1;

if (tok->cont_line)

/* It's a continuation line, so it can't be a coding spec. */

return 1;

cs = get_coding_spec(line, size);

if (cs != NULL) {

tok->read_coding_spec = 1;

if (tok->encoding == NULL) {

assert(tok->decoding_state == 1); /* raw */

if (strcmp(cs, "utf-8") == 0 ||

strcmp(cs, "iso-8859-1") == 0) {

tok->encoding = cs;

} else {

#ifdef Py_USING_UNICODE

r = set_readline(tok, cs);

if (r) {

tok->encoding = cs;

tok->decoding_state = -1;

}

else

PyMem_FREE(cs);

/* Without Unicode support, we cannot

PyMem_FREE(cs);

}

} else { /* then, compare cs with BOM */

r = (strcmp(tok->encoding, cs) == 0);

PyMem_FREE(cs);

}

}

if (!r) {

cs = tok->encoding;

if (!cs)

cs = "with BOM";

PyErr_Format(PyExc_SyntaxError, "encoding problem: %s", cs);

}

return r;

}

static int

check_bom(int get_char(struct tok_state *),

void unget_char(int, struct tok_state *),

int set_readline(struct tok_state *, const char *),

struct tok_state *tok)

{

int ch = get_char(tok);

tok->decoding_state = 1;

if (ch == EOF) {

return 1;

} else if (ch == 0xEF) {

ch = get_char(tok); if (ch != 0xBB) goto NON_BOM;

ch = get_char(tok); if (ch != 0xBF) goto NON_BOM;

#if 0

/* Disable support for UTF-16 BOMs until a decision

} else if (ch == 0xFE) {

ch = get_char(tok); if (ch != 0xFF) goto NON_BOM;

if (!set_readline(tok, "utf-16-be")) return 0;

tok->decoding_state = -1;

} else if (ch == 0xFF) {

ch = get_char(tok); if (ch != 0xFE) goto NON_BOM;

if (!set_readline(tok, "utf-16-le")) return 0;

tok->decoding_state = -1;

} else {

unget_char(ch, tok);

return 1;

}

if (tok->encoding != NULL)

PyMem_FREE(tok->encoding);

tok->encoding = new_string("utf-8", 5); /* resulting is in utf-8 */

return 1;

NON_BOM:

/* any token beginning with '\xEF', '\xFE', '\xFF' is a bad token */

unget_char(0xFF, tok); /* XXX this will cause a syntax error */

return 1;

}

static char *

fp_readl(char *s, int size, struct tok_state *tok)

{

#ifndef Py_USING_UNICODE

/* In a non-Unicode built, this should never be called. */

Py_FatalError("fp_readl should not be called in this build.");

return NULL; /* Keep compiler happy (not reachable) */

PyObject* utf8 = NULL;

PyObject* buf = tok->decoding_buffer;

char *str;

Py_ssize_t utf8len;

/* Ask for one less byte so we can terminate it */

assert(size > 0);

size--;

if (buf == NULL) {

buf = PyObject_CallObject(tok->decoding_readline, NULL);

if (buf == NULL)

return error_ret(tok);

} else {

tok->decoding_buffer = NULL;

if (PyString_CheckExact(buf))

utf8 = buf;

}

if (utf8 == NULL) {

utf8 = PyUnicode_AsUTF8String(buf);

Py_DECREF(buf);

if (utf8 == NULL)

return error_ret(tok);

}

str = PyString_AsString(utf8);

utf8len = PyString_GET_SIZE(utf8);

if (utf8len > size) {

tok->decoding_buffer = PyString_FromStringAndSize(str+size, utf8len-size);

if (tok->decoding_buffer == NULL) {

Py_DECREF(utf8);

return error_ret(tok);

}

utf8len = size;

}

memcpy(s, str, utf8len);

s[utf8len] = '\0';

Py_DECREF(utf8);

if (utf8len == 0) return NULL; /* EOF */

return s;

}

static int

fp_setreadl(struct tok_state *tok, const char* enc)

{

PyObject *reader, *stream, *readline;

/* XXX: constify filename argument. */

stream = PyFile_FromFile(tok->fp, (char*)tok->filename, "rb", NULL);

if (stream == NULL)

return 0;

reader = PyCodec_StreamReader(enc, stream, NULL);

Py_DECREF(stream);

if (reader == NULL)

return 0;

readline = PyObject_GetAttrString(reader, "readline");

Py_DECREF(reader);

if (readline == NULL)

return 0;

tok->decoding_readline = readline;

return 1;

}

static int fp_getc(struct tok_state *tok) {

return getc(tok->fp);

}

static void fp_ungetc(int c, struct tok_state *tok) {

ungetc(c, tok->fp);

}

static char *

decoding_fgets(char *s, int size, struct tok_state *tok)

{

char *line = NULL;

int badchar = 0;

for (;;) {

if (tok->decoding_state < 0) {

/* We already have a codec associated with

line = fp_readl(s, size, tok);

break;

} else if (tok->decoding_state > 0) {

/* We want a 'raw' read. */

line = Py_UniversalNewlineFgets(s, size,

tok->fp, NULL);

break;

} else {

/* We have not yet determined the encoding.

if (!check_bom(fp_getc, fp_ungetc, fp_setreadl, tok))

return error_ret(tok);

assert(tok->decoding_state != 0);

}

}

if (line != NULL && tok->lineno < 2 && !tok->read_coding_spec) {

if (!check_coding_spec(line, strlen(line), tok, fp_setreadl)) {

return error_ret(tok);

}

}

#ifndef PGEN

/* The default encoding is ASCII, so make sure we don't have any

if (line && !tok->encoding) {

unsigned char *c;

for (c = (unsigned char *)line; *c; c++)

if (*c > 127) {

badchar = *c;

break;

}

}

if (badchar) {

char buf[500];

/* Need to add 1 to the line number, since this line

sprintf(buf,

"Non-ASCII character '\\x%.2x' "

"in file %.200s on line %i, "

"but no encoding declared; "

"see http://www.python.org/peps/pep-0263.html for details",

badchar, tok->filename, tok->lineno + 1);

PyErr_SetString(PyExc_SyntaxError, buf);

return error_ret(tok);

}

return line;

}

static int

decoding_feof(struct tok_state *tok)

{

if (tok->decoding_state >= 0) {

return feof(tok->fp);

} else {

PyObject* buf = tok->decoding_buffer;

if (buf == NULL) {

buf = PyObject_CallObject(tok->decoding_readline, NULL);

if (buf == NULL) {

error_ret(tok);

return 1;

} else {

tok->decoding_buffer = buf;

}

}

return PyObject_Length(buf) == 0;

}

}

static int

buf_getc(struct tok_state *tok) {

return Py_CHARMASK(*tok->str++);

}

static void

buf_ungetc(int c, struct tok_state *tok) {

tok->str--;

assert(Py_CHARMASK(*tok->str) == c); /* tok->cur may point to read-only segment */

}

static int

buf_setreadl(struct tok_state *tok, const char* enc) {

tok->enc = enc;

return 1;

}

#ifdef Py_USING_UNICODE

static PyObject *

translate_into_utf8(const char* str, const char* enc) {

PyObject *utf8;

PyObject* buf = PyUnicode_Decode(str, strlen(str), enc, NULL);

if (buf == NULL)

return NULL;

utf8 = PyUnicode_AsUTF8String(buf);

Py_DECREF(buf);

return utf8;

}

static const char *

decode_str(const char *str, struct tok_state *tok)

{

PyObject* utf8 = NULL;

const char *s;

const char *newl[2] = {NULL, NULL};

int lineno = 0;

tok->enc = NULL;

tok->str = str;

if (!check_bom(buf_getc, buf_ungetc, buf_setreadl, tok))

return error_ret(tok);

str = tok->str; /* string after BOM if any */

assert(str);

#ifdef Py_USING_UNICODE

if (tok->enc != NULL) {

utf8 = translate_into_utf8(str, tok->enc);

if (utf8 == NULL)

return error_ret(tok);

str = PyString_AsString(utf8);

}

for (s = str;; s++) {

if (*s == '\0') break;

else if (*s == '\n') {

assert(lineno < 2);

newl[lineno] = s;

lineno++;

if (lineno == 2) break;

}

}

tok->enc = NULL;

/* need to check line 1 and 2 separately since check_coding_spec

if (newl[0]) {

if (!check_coding_spec(str, newl[0] - str, tok, buf_setreadl))

return error_ret(tok);

if (tok->enc == NULL && newl[1]) {

if (!check_coding_spec(newl[0]+1, newl[1] - newl[0],

tok, buf_setreadl))

return error_ret(tok);

}

}

#ifdef Py_USING_UNICODE

if (tok->enc != NULL) {

assert(utf8 == NULL);

utf8 = translate_into_utf8(str, tok->enc);

if (utf8 == NULL) {

PyErr_Format(PyExc_SyntaxError,

"unknown encoding: %s", tok->enc);

return error_ret(tok);

}

str = PyString_AsString(utf8);

}

assert(tok->decoding_buffer == NULL);

tok->decoding_buffer = utf8; /* CAUTION */

return str;

}

#endif /* PGEN */

struct tok_state *

PyTokenizer_FromString(const char *str)

{

struct tok_state *tok = tok_new();

if (tok == NULL)

return NULL;

str = (char *)decode_str(str, tok);

if (str == NULL) {

PyTokenizer_Free(tok);

return NULL;

}

/* XXX: constify members. */

tok->buf = tok->cur = tok->end = tok->inp = (char*)str;

return tok;

}

struct tok_state *

PyTokenizer_FromFile(FILE *fp, char *ps1, char *ps2)

{

struct tok_state *tok = tok_new();

if (tok == NULL)

return NULL;

if ((tok->buf = (char *)PyMem_MALLOC(BUFSIZ)) == NULL) {

PyTokenizer_Free(tok);

return NULL;

}

tok->cur = tok->inp = tok->buf;

tok->end = tok->buf + BUFSIZ;

tok->fp = fp;

tok->prompt = ps1;

tok->nextprompt = ps2;

return tok;

}

PyTokenizer_Free(struct tok_state *tok)

{

if (tok->encoding != NULL)

PyMem_FREE(tok->encoding);

#ifndef PGEN

Py_XDECREF(tok->decoding_readline);

Py_XDECREF(tok->decoding_buffer);

if (tok->fp != NULL && tok->buf != NULL)

PyMem_FREE(tok->buf);

PyMem_FREE(tok);

}

#if !defined(PGEN) && defined(Py_USING_UNICODE)

static int

tok_stdin_decode(struct tok_state *tok, char **inp)

{

PyObject *enc, *sysstdin, *decoded, *utf8;

const char *encoding;

char *converted;

if (PySys_GetFile((char *)"stdin", NULL) != stdin)

return 0;

sysstdin = PySys_GetObject("stdin");

if (sysstdin == NULL || !PyFile_Check(sysstdin))

return 0;

enc = ((PyFileObject *)sysstdin)->f_encoding;

if (enc == NULL || !PyString_Check(enc))

return 0;

Py_INCREF(enc);

encoding = PyString_AsString(enc);

decoded = PyUnicode_Decode(*inp, strlen(*inp), encoding, NULL);

if (decoded == NULL)

goto error_clear;

utf8 = PyUnicode_AsEncodedString(decoded, "utf-8", NULL);

Py_DECREF(decoded);

if (utf8 == NULL)

goto error_clear;

assert(PyString_Check(utf8));

converted = new_string(PyString_AS_STRING(utf8),

PyString_GET_SIZE(utf8));

Py_DECREF(utf8);

if (converted == NULL)

goto error_nomem;

PyMem_FREE(*inp);

*inp = converted;

if (tok->encoding != NULL)

PyMem_FREE(tok->encoding);

tok->encoding = new_string(encoding, strlen(encoding));

if (tok->encoding == NULL)

goto error_nomem;

Py_DECREF(enc);

return 0;

error_nomem:

Py_DECREF(enc);

tok->done = E_NOMEM;

return -1;

error_clear:

/* Fallback to iso-8859-1: for backward compatibility */

Py_DECREF(enc);

PyErr_Clear();

return 0;

}

static int

tok_nextc(register struct tok_state *tok)

{

for (;;) {

if (tok->cur != tok->inp) {

return Py_CHARMASK(*tok->cur++); /* Fast path */

}

if (tok->done != E_OK)

return EOF;

if (tok->fp == NULL) {

char *end = strchr(tok->inp, '\n');

if (end != NULL)

end++;

else {

end = strchr(tok->inp, '\0');

if (end == tok->inp) {

tok->done = E_EOF;

return EOF;

}

}

if (tok->start == NULL)

tok->buf = tok->cur;

tok->line_start = tok->cur;

tok->lineno++;

tok->inp = end;

return Py_CHARMASK(*tok->cur++);

}

if (tok->prompt != NULL) {

char *newtok = PyOS_Readline(stdin, stdout, tok->prompt);

if (tok->nextprompt != NULL)

tok->prompt = tok->nextprompt;

if (newtok == NULL)

tok->done = E_INTR;

else if (*newtok == '\0') {

PyMem_FREE(newtok);

tok->done = E_EOF;

}

#if !defined(PGEN) && defined(Py_USING_UNICODE)

else if (tok_stdin_decode(tok, &newtok) != 0)

PyMem_FREE(newtok);

else if (tok->start != NULL) {

size_t start = tok->start - tok->buf;

size_t oldlen = tok->cur - tok->buf;

size_t newlen = oldlen + strlen(newtok);

char *buf = tok->buf;

buf = (char *)PyMem_REALLOC(buf, newlen+1);

tok->lineno++;

if (buf == NULL) {

PyMem_FREE(tok->buf);

tok->buf = NULL;

PyMem_FREE(newtok);

tok->done = E_NOMEM;

return EOF;

}

tok->buf = buf;

tok->cur = tok->buf + oldlen;

tok->line_start = tok->cur;

strcpy(tok->buf + oldlen, newtok);

PyMem_FREE(newtok);

tok->inp = tok->buf + newlen;

tok->end = tok->inp + 1;

tok->start = tok->buf + start;

}

else {

tok->lineno++;

if (tok->buf != NULL)

PyMem_FREE(tok->buf);

tok->buf = newtok;

tok->line_start = tok->buf;

tok->cur = tok->buf;

tok->line_start = tok->buf;

tok->inp = strchr(tok->buf, '\0');

tok->end = tok->inp + 1;

}

}

else {

int done = 0;

Py_ssize_t cur = 0;

char *pt;

if (tok->start == NULL) {

if (tok->buf == NULL) {

tok->buf = (char *)

PyMem_MALLOC(BUFSIZ);

if (tok->buf == NULL) {

tok->done = E_NOMEM;

return EOF;

}

tok->end = tok->buf + BUFSIZ;

}

if (decoding_fgets(tok->buf, (int)(tok->end - tok->buf),

tok) == NULL) {

tok->done = E_EOF;

done = 1;

}

else {

tok->done = E_OK;

tok->inp = strchr(tok->buf, '\0');

done = tok->inp[-1] == '\n';

}

}

else {

cur = tok->cur - tok->buf;

if (decoding_feof(tok)) {

tok->done = E_EOF;

done = 1;

}

else

tok->done = E_OK;

}

tok->lineno++;

/* Read until '\n' or EOF */

while (!done) {

Py_ssize_t curstart = tok->start == NULL ? -1 :

tok->start - tok->buf;

Py_ssize_t curvalid = tok->inp - tok->buf;

Py_ssize_t newsize = curvalid + BUFSIZ;

char *newbuf = tok->buf;

newbuf = (char *)PyMem_REALLOC(newbuf,

newsize);

if (newbuf == NULL) {

tok->done = E_NOMEM;

tok->cur = tok->inp;

return EOF;

}

tok->buf = newbuf;

tok->inp = tok->buf + curvalid;

tok->end = tok->buf + newsize;

tok->start = curstart < 0 ? NULL :

tok->buf + curstart;

if (decoding_fgets(tok->inp,

(int)(tok->end - tok->inp),

tok) == NULL) {

/* Break out early on decoding

if (tok->decoding_erred)

return EOF;

/* Last line does not end in \n,

strcpy(tok->inp, "\n");

}

tok->inp = strchr(tok->inp, '\0');

done = tok->inp[-1] == '\n';

}

if (tok->buf != NULL) {

tok->cur = tok->buf + cur;

tok->line_start = tok->cur;

/* replace "\r\n" with "\n" */

/* For Mac leave the \r, giving a syntax error */

pt = tok->inp - 2;

if (pt >= tok->buf && *pt == '\r') {

*pt++ = '\n';

*pt = '\0';

tok->inp = pt;

}

}

}

if (tok->done != E_OK) {

if (tok->prompt != NULL)

PySys_WriteStderr("\n");

tok->cur = tok->inp;

return EOF;

}

}

/*NOTREACHED*/

}

static void

tok_backup(register struct tok_state *tok, register int c)

{

if (c != EOF) {

if (--tok->cur < tok->buf)

Py_FatalError("tok_backup: begin of buffer");

if (*tok->cur != c)

*tok->cur = c;

}

}

PyToken_OneChar(int c)

{

switch (c) {

case '(': return LPAR;

case ')': return RPAR;

case '[': return LSQB;

case ']': return RSQB;

case ':': return COLON;

case ',': return COMMA;

case ';': return SEMI;

case '+': return PLUS;

case '-': return MINUS;

case '*': return STAR;

case '/': return SLASH;

case '|': return VBAR;

case '&': return AMPER;

case '<': return LESS;

case '>': return GREATER;

case '=': return EQUAL;

case '.': return DOT;

case '%': return PERCENT;

case '`': return BACKQUOTE;

case '{': return LBRACE;

case '}': return RBRACE;

case '^': return CIRCUMFLEX;

case '~': return TILDE;

case '@': return AT;

default: return OP;

}

}

PyToken_TwoChars(int c1, int c2)

{

switch (c1) {

case '=':

switch (c2) {

case '=': return EQEQUAL;

}

break;

case '!':

switch (c2) {

case '=': return NOTEQUAL;

}

break;

case '<':

switch (c2) {

case '>': return NOTEQUAL;

case '=': return LESSEQUAL;

case '<': return LEFTSHIFT;

}

break;

case '>':

switch (c2) {

case '=': return GREATEREQUAL;

case '>': return RIGHTSHIFT;

}

break;