715 lines
15 KiB
C
715 lines
15 KiB
C
/***********************************************************
|
|
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
|
|
The Netherlands.
|
|
|
|
All Rights Reserved
|
|
|
|
Permission to use, copy, modify, and distribute this software and its
|
|
documentation for any purpose and without fee is hereby granted,
|
|
provided that the above copyright notice appear in all copies and that
|
|
both that copyright notice and this permission notice appear in
|
|
supporting documentation, and that the names of Stichting Mathematisch
|
|
Centrum or CWI not be used in advertising or publicity pertaining to
|
|
distribution of the software without specific, written prior permission.
|
|
|
|
STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
|
|
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
|
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
|
|
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
|
|
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
******************************************************************/
|
|
|
|
/* Tokenizer implementation */
|
|
|
|
#include "pgenheaders.h"
|
|
|
|
#include <ctype.h>
|
|
|
|
#include "tokenizer.h"
|
|
#include "errcode.h"
|
|
|
|
extern char *my_readline PROTO((char *));
|
|
/* Return malloc'ed string including trailing \n;
|
|
empty malloc'ed string for EOF;
|
|
NULL if interrupted */
|
|
|
|
/* Don't ever change this -- it would break the portability of Python code */
|
|
#define TABSIZE 8
|
|
|
|
/* Forward */
|
|
static struct tok_state *tok_new PROTO((void));
|
|
static int tok_nextc PROTO((struct tok_state *tok));
|
|
static void tok_backup PROTO((struct tok_state *tok, int c));
|
|
|
|
/* Token names */
|
|
|
|
char *tok_name[] = {
|
|
"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",
|
|
/* This table must match the #defines in token.h! */
|
|
"OP",
|
|
"<ERRORTOKEN>",
|
|
"<N_TOKENS>"
|
|
};
|
|
|
|
|
|
/* Create and initialize a new tok_state structure */
|
|
|
|
static struct tok_state *
|
|
tok_new()
|
|
{
|
|
struct tok_state *tok = NEW(struct tok_state, 1);
|
|
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;
|
|
return tok;
|
|
}
|
|
|
|
|
|
/* Set up tokenizer for string */
|
|
|
|
struct tok_state *
|
|
tok_setups(str)
|
|
char *str;
|
|
{
|
|
struct tok_state *tok = tok_new();
|
|
if (tok == NULL)
|
|
return NULL;
|
|
tok->buf = tok->cur = tok->end = tok->inp = str;
|
|
return tok;
|
|
}
|
|
|
|
|
|
/* Set up tokenizer for file */
|
|
|
|
struct tok_state *
|
|
tok_setupf(fp, ps1, ps2)
|
|
FILE *fp;
|
|
char *ps1, *ps2;
|
|
{
|
|
struct tok_state *tok = tok_new();
|
|
if (tok == NULL)
|
|
return NULL;
|
|
if ((tok->buf = NEW(char, BUFSIZ)) == NULL) {
|
|
DEL(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;
|
|
}
|
|
|
|
|
|
/* Free a tok_state structure */
|
|
|
|
void
|
|
tok_free(tok)
|
|
struct tok_state *tok;
|
|
{
|
|
if (tok->fp != NULL && tok->buf != NULL)
|
|
DEL(tok->buf);
|
|
DEL(tok);
|
|
}
|
|
|
|
|
|
/* Get next char, updating state; error code goes into tok->done */
|
|
|
|
static int
|
|
tok_nextc(tok)
|
|
register struct tok_state *tok;
|
|
{
|
|
for (;;) {
|
|
if (tok->cur != tok->inp) {
|
|
return *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->lineno++;
|
|
tok->inp = end;
|
|
return *tok->cur++;
|
|
}
|
|
if (tok->prompt != NULL) {
|
|
char *new = my_readline(tok->prompt);
|
|
if (tok->nextprompt != NULL)
|
|
tok->prompt = tok->nextprompt;
|
|
if (new == NULL)
|
|
tok->done = E_INTR;
|
|
else if (*new == '\0') {
|
|
free(new);
|
|
tok->done = E_EOF;
|
|
}
|
|
else if (tok->start != NULL) {
|
|
int start = tok->start - tok->buf;
|
|
int oldlen = tok->cur - tok->buf;
|
|
int newlen = oldlen + strlen(new);
|
|
char *buf = realloc(tok->buf, newlen+1);
|
|
tok->lineno++;
|
|
if (buf == NULL) {
|
|
free(tok->buf);
|
|
tok->buf = NULL;
|
|
free(new);
|
|
tok->done = E_NOMEM;
|
|
return EOF;
|
|
}
|
|
tok->buf = buf;
|
|
tok->cur = tok->buf + oldlen;
|
|
strcpy(tok->buf + oldlen, new);
|
|
free(new);
|
|
tok->inp = tok->buf + newlen;
|
|
tok->end = tok->inp + 1;
|
|
tok->start = tok->buf + start;
|
|
}
|
|
else {
|
|
tok->lineno++;
|
|
if (tok->buf != NULL)
|
|
free(tok->buf);
|
|
tok->buf = new;
|
|
tok->cur = tok->buf;
|
|
tok->inp = strchr(tok->buf, '\0');
|
|
tok->end = tok->inp + 1;
|
|
}
|
|
}
|
|
else {
|
|
int done = 0;
|
|
int cur = 0;
|
|
if (tok->start == NULL) {
|
|
if (tok->buf == NULL) {
|
|
tok->buf = NEW(char, BUFSIZ);
|
|
if (tok->buf == NULL) {
|
|
tok->done = E_NOMEM;
|
|
return EOF;
|
|
}
|
|
tok->end = tok->buf + BUFSIZ;
|
|
}
|
|
if (fgets(tok->buf, (int)(tok->end - tok->buf),
|
|
tok->fp) == 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;
|
|
tok->done = E_OK;
|
|
}
|
|
tok->lineno++;
|
|
/* Read until '\n' or EOF */
|
|
while (!done) {
|
|
int curstart = tok->start == NULL ? -1 :
|
|
tok->start - tok->buf;
|
|
int curvalid = tok->inp - tok->buf;
|
|
int cursize = tok->end - tok->buf;
|
|
int newsize = cursize + BUFSIZ;
|
|
char *newbuf = tok->buf;
|
|
RESIZE(newbuf, char, 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 (fgets(tok->inp,
|
|
(int)(tok->end - tok->inp),
|
|
tok->fp) == NULL) {
|
|
/* Last line does not end in \n,
|
|
fake one */
|
|
strcpy(tok->inp, "\n");
|
|
}
|
|
tok->inp = strchr(tok->inp, '\0');
|
|
done = tok->inp[-1] == '\n';
|
|
}
|
|
tok->cur = tok->buf + cur;
|
|
}
|
|
if (tok->done != E_OK) {
|
|
if (tok->prompt != NULL)
|
|
fprintf(stderr, "\n");
|
|
tok->cur = tok->inp;
|
|
return EOF;
|
|
}
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
|
|
/* Back-up one character */
|
|
|
|
static void
|
|
tok_backup(tok, c)
|
|
register struct tok_state *tok;
|
|
register int c;
|
|
{
|
|
if (c != EOF) {
|
|
if (--tok->cur < tok->buf)
|
|
fatal("tok_backup: begin of buffer");
|
|
if (*tok->cur != c)
|
|
*tok->cur = c;
|
|
}
|
|
}
|
|
|
|
|
|
/* Return the token corresponding to a single character */
|
|
|
|
int
|
|
tok_1char(c)
|
|
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;
|
|
default: return OP;
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
tok_2char(c1, c2)
|
|
int c1, 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;
|
|
}
|
|
return OP;
|
|
}
|
|
|
|
|
|
/* Get next token, after space stripping etc. */
|
|
|
|
int
|
|
tok_get(tok, p_start, p_end)
|
|
register struct tok_state *tok; /* In/out: tokenizer state */
|
|
char **p_start, **p_end; /* Out: point to start/end of token */
|
|
{
|
|
register int c;
|
|
int blankline;
|
|
|
|
*p_start = *p_end = NULL;
|
|
nextline:
|
|
tok->start = NULL;
|
|
blankline = 0;
|
|
|
|
/* Get indentation level */
|
|
if (tok->atbol) {
|
|
register int col = 0;
|
|
tok->atbol = 0;
|
|
for (;;) {
|
|
c = tok_nextc(tok);
|
|
if (c == ' ')
|
|
col++;
|
|
else if (c == '\t')
|
|
col = (col/tok->tabsize + 1) * tok->tabsize;
|
|
else
|
|
break;
|
|
}
|
|
tok_backup(tok, c);
|
|
if (c == '#' || c == '\n') {
|
|
/* Lines with only whitespace and/or comments
|
|
shouldn't affect the indentation and are
|
|
not passed to the parser as NEWLINE tokens,
|
|
except *totally* empty lines in interactive
|
|
mode, which signal the end of a command group. */
|
|
if (col == 0 && c == '\n' && tok->prompt != NULL)
|
|
blankline = 0; /* Let it through */
|
|
else
|
|
blankline = 1; /* Ignore completely */
|
|
/* We can't jump back right here since we still
|
|
may need to skip to the end of a comment */
|
|
}
|
|
if (!blankline && tok->level == 0) {
|
|
if (col == tok->indstack[tok->indent]) {
|
|
/* No change */
|
|
}
|
|
else if (col > tok->indstack[tok->indent]) {
|
|
/* Indent -- always one */
|
|
if (tok->indent+1 >= MAXINDENT) {
|
|
fprintf(stderr, "excessive indent\n");
|
|
tok->done = E_TOKEN;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
tok->pendin++;
|
|
tok->indstack[++tok->indent] = col;
|
|
}
|
|
else /* col < tok->indstack[tok->indent] */ {
|
|
/* Dedent -- any number, must be consistent */
|
|
while (tok->indent > 0 &&
|
|
col < tok->indstack[tok->indent]) {
|
|
tok->indent--;
|
|
tok->pendin--;
|
|
}
|
|
if (col != tok->indstack[tok->indent]) {
|
|
fprintf(stderr, "inconsistent dedent\n");
|
|
tok->done = E_TOKEN;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
tok->start = tok->cur;
|
|
|
|
/* Return pending indents/dedents */
|
|
if (tok->pendin != 0) {
|
|
if (tok->pendin < 0) {
|
|
tok->pendin++;
|
|
return DEDENT;
|
|
}
|
|
else {
|
|
tok->pendin--;
|
|
return INDENT;
|
|
}
|
|
}
|
|
|
|
again:
|
|
tok->start = NULL;
|
|
/* Skip spaces */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (c == ' ' || c == '\t');
|
|
|
|
/* Set start of current token */
|
|
tok->start = tok->cur - 1;
|
|
|
|
/* Skip comment */
|
|
if (c == '#') {
|
|
/* Hack to allow overriding the tabsize in the file.
|
|
This is also recognized by vi, when it occurs near the
|
|
beginning or end of the file. (Will vi never die...?)
|
|
For Python it must be at the beginning of the file! */
|
|
/* XXX The real vi syntax is actually different :-( */
|
|
/* XXX Should recognize Emacs syntax, too */
|
|
int x;
|
|
if (sscanf(tok->cur,
|
|
" vi:set tabsize=%d:", &x) == 1 &&
|
|
x >= 1 && x <= 40) {
|
|
/* fprintf(stderr, "# vi:set tabsize=%d:\n", x); */
|
|
tok->tabsize = x;
|
|
}
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (c != EOF && c != '\n');
|
|
}
|
|
|
|
/* Check for EOF and errors now */
|
|
if (c == EOF) {
|
|
return tok->done == E_EOF ? ENDMARKER : ERRORTOKEN;
|
|
}
|
|
|
|
/* Identifier (most frequent token!) */
|
|
if (isalpha(c) || c == '_') {
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isalnum(c) || c == '_');
|
|
tok_backup(tok, c);
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return NAME;
|
|
}
|
|
|
|
/* Newline */
|
|
if (c == '\n') {
|
|
tok->atbol = 1;
|
|
if (blankline || tok->level > 0)
|
|
goto nextline;
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur - 1; /* Leave '\n' out of the string */
|
|
return NEWLINE;
|
|
}
|
|
|
|
/* Period or number starting with period? */
|
|
if (c == '.') {
|
|
c = tok_nextc(tok);
|
|
if (isdigit(c)) {
|
|
goto fraction;
|
|
}
|
|
else {
|
|
tok_backup(tok, c);
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return DOT;
|
|
}
|
|
}
|
|
|
|
/* Number */
|
|
if (isdigit(c)) {
|
|
if (c == '0') {
|
|
/* Hex or octal */
|
|
c = tok_nextc(tok);
|
|
if (c == '.')
|
|
goto fraction;
|
|
if (c == 'x' || c == 'X') {
|
|
/* Hex */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isxdigit(c));
|
|
}
|
|
else {
|
|
/* XXX This is broken! E.g.,
|
|
09.9 should be accepted as float! */
|
|
/* Octal; c is first char of it */
|
|
/* There's no 'isoctdigit' macro, sigh */
|
|
while ('0' <= c && c < '8') {
|
|
c = tok_nextc(tok);
|
|
}
|
|
}
|
|
if (c == 'l' || c == 'L')
|
|
c = tok_nextc(tok);
|
|
}
|
|
else {
|
|
/* Decimal */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isdigit(c));
|
|
if (c == 'l' || c == 'L')
|
|
c = tok_nextc(tok);
|
|
else {
|
|
/* Accept floating point numbers.
|
|
XXX This accepts incomplete things like
|
|
XXX 12e or 1e+; worry run-time */
|
|
if (c == '.') {
|
|
fraction:
|
|
/* Fraction */
|
|
do {
|
|
c = tok_nextc(tok);
|
|
} while (isdigit(c));
|
|
}
|
|
if (c == 'e' || c == 'E') {
|
|
/* Exponent part */
|
|
c = tok_nextc(tok);
|
|
if (c == '+' || c == '-')
|
|
c = tok_nextc(tok);
|
|
while (isdigit(c)) {
|
|
c = tok_nextc(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
tok_backup(tok, c);
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return NUMBER;
|
|
}
|
|
|
|
/* String */
|
|
if (c == '\'' || c == '"') {
|
|
int quote = c;
|
|
int triple = 0;
|
|
int tripcount = 0;
|
|
for (;;) {
|
|
c = tok_nextc(tok);
|
|
if (c == '\n') {
|
|
if (!triple) {
|
|
tok->done = E_TOKEN;
|
|
tok_backup(tok, c);
|
|
return ERRORTOKEN;
|
|
}
|
|
tripcount = 0;
|
|
}
|
|
else if (c == EOF) {
|
|
tok->done = E_TOKEN;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
else if (c == quote) {
|
|
tripcount++;
|
|
if (tok->cur == tok->start+2) {
|
|
c = tok_nextc(tok);
|
|
if (c == quote) {
|
|
triple = 1;
|
|
tripcount = 0;
|
|
continue;
|
|
}
|
|
tok_backup(tok, c);
|
|
}
|
|
if (!triple || tripcount == 3)
|
|
break;
|
|
}
|
|
else if (c == '\\') {
|
|
tripcount = 0;
|
|
c = tok_nextc(tok);
|
|
if (c == EOF) {
|
|
tok->done = E_TOKEN;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
}
|
|
else
|
|
tripcount = 0;
|
|
}
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return STRING;
|
|
}
|
|
|
|
/* Line continuation */
|
|
if (c == '\\') {
|
|
c = tok_nextc(tok);
|
|
if (c != '\n') {
|
|
tok->done = E_TOKEN;
|
|
tok->cur = tok->inp;
|
|
return ERRORTOKEN;
|
|
}
|
|
goto again; /* Read next line */
|
|
}
|
|
|
|
/* Check for two-character token */
|
|
{
|
|
int c2 = tok_nextc(tok);
|
|
int token = tok_2char(c, c2);
|
|
if (token != OP) {
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return token;
|
|
}
|
|
tok_backup(tok, c2);
|
|
}
|
|
|
|
/* Keep track of parentheses nesting level */
|
|
switch (c) {
|
|
case '(':
|
|
case '[':
|
|
case '{':
|
|
tok->level++;
|
|
break;
|
|
case ')':
|
|
case ']':
|
|
case '}':
|
|
tok->level--;
|
|
break;
|
|
}
|
|
|
|
/* Punctuation character */
|
|
*p_start = tok->start;
|
|
*p_end = tok->cur;
|
|
return tok_1char(c);
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
|
|
void
|
|
tok_dump(type, start, end)
|
|
int type;
|
|
char *start, *end;
|
|
{
|
|
printf("%s", tok_name[type]);
|
|
if (type == NAME || type == NUMBER || type == STRING || type == OP)
|
|
printf("(%.*s)", (int)(end - start), start);
|
|
}
|
|
|
|
#endif
|