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(saved_doc_string*): New variables.

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(load_force_doc_strings): New variable.
(syms_of_lread): Set up Lisp var load-force-doc-strings.
(read_list): Handle load_force_doc_strings.
Use the saved_doc_string, if it's right; otherwise, reread from file.
(read1): Save last doc string in saved_doc_string.
This commit is contained in:
Richard M. Stallman 1995-08-05 22:51:17 +00:00
parent 03524be63a
commit b2a30870b0
1 changed files with 108 additions and 7 deletions
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115
src/lread.c
View file

@ -91,19 +91,31 @@ Lisp_Object Vload_file_name;
/* Function to use for reading, in `load' and friends. */
Lisp_Object Vload_read_function;
/* Nonzero means load should forcibly load all dynamic doc strings. */
static int load_force_doc_strings;
/* List of descriptors now open for Fload. */
static Lisp_Object load_descriptor_list;
/* File for get_file_char to read from. Use by load */
/* File for get_file_char to read from. Use by load. */
static FILE *instream;
/* When nonzero, read conses in pure space */
static int read_pure;
/* For use within read-from-string (this reader is non-reentrant!!) */
/* For use within read-from-string (this reader is non-reentrant!!) */
static int read_from_string_index;
static int read_from_string_limit;
/* This contains the last string skipped with #@. */
static char *saved_doc_string;
/* Length of buffer allocated in saved_doc_string. */
static int saved_doc_string_size;
/* Length of actual data in saved_doc_string. */
static int saved_doc_string_length;
/* This is the file position that string came from. */
static int saved_doc_string_position;
/* Nonzero means inside a new-style backquote
with no surrounding parentheses.
Fread initializes this to zero, so we need not specbind it
@ -462,6 +474,11 @@ Return t if file exists.")
Fprogn (Fcdr (temp));
UNGCPRO;
if (saved_doc_string)
free (saved_doc_string);
saved_doc_string = 0;
saved_doc_string_size = 0;
if (!noninteractive && NILP (nomessage))
message ("Loading %s...done", XSTRING (str)->data);
return Qt;
@ -1223,9 +1240,39 @@ read1 (readcharfun, pch, first_in_list)
if (c >= 0)
UNREAD (c);
/* Skip that many characters. */
for (i = 0; i < nskip && c >= 0; i++)
c = READCHAR;
#ifndef DOS_NT /* I don't know if filepos works right on MSDOS and Windoze. */
if (load_force_doc_strings && EQ (readcharfun, Qget_file_char))
{
/* If we are supposed to force doc strings into core right now,
record the last string that we skipped,
and record where in the file it comes from. */
if (saved_doc_string_size == 0)
{
saved_doc_string_size = nskip + 100;
saved_doc_string = (char *) malloc (saved_doc_string_size);
}
if (nskip > saved_doc_string_size)
{
saved_doc_string_size = nskip + 100;
saved_doc_string = (char *) realloc (saved_doc_string,
saved_doc_string_size);
}
saved_doc_string_position = ftell (instream);
/* Copy that many characters into saved_doc_string. */
for (i = 0; i < nskip && c >= 0; i++)
saved_doc_string[i] = c = READCHAR;
saved_doc_string_length = i;
}
else
#endif /* not DOS_NT */
{
/* Skip that many characters. */
for (i = 0; i < nskip && c >= 0; i++)
c = READCHAR;
}
goto retry;
}
if (c == '$')
@ -1565,7 +1612,8 @@ read_list (flag, readcharfun)
register Lisp_Object elt, tem;
struct gcpro gcpro1, gcpro2;
/* 0 is the normal case.
1 means this list is a doc reference; replace it with the number 0. */
1 means this list is a doc reference; replace it with the number 0.
2 means this list is a doc reference; replace it with the doc string. */
int doc_reference = 0;
/* Initialize this to 1 if we are reading a list. */
@ -1602,6 +1650,9 @@ read_list (flag, readcharfun)
elt = concat2 (build_string ("../lisp/"),
Ffile_name_nondirectory (elt));
}
else if (EQ (elt, Vload_file_name)
&& load_force_doc_strings)
doc_reference = 2;
if (ch)
{
@ -1627,6 +1678,46 @@ read_list (flag, readcharfun)
{
if (doc_reference == 1)
return make_number (0);
if (doc_reference == 2)
{
/* Get a doc string from the file we are loading.
If it's in saved_doc_string, get it from there. */
int pos = XINT (XCONS (val)->cdr);
if (pos >= saved_doc_string_position
&& pos < (saved_doc_string_position
+ saved_doc_string_length))
{
int start = pos - saved_doc_string_position;
int from, to;
/* Process quoting with ^A,
and find the end of the string,
which is marked with ^_ (037). */
for (from = start, to = start;
saved_doc_string[from] != 037;)
{
int c = saved_doc_string[from++];
if (c == 1)
{
c = saved_doc_string[from++];
if (c == 1)
saved_doc_string[to++] = c;
else if (c == '0')
saved_doc_string[to++] = 0;
else if (c == '_')
saved_doc_string[to++] = 037;
}
else
saved_doc_string[to++] = c;
}
return make_string (saved_doc_string + start,
to - start);
}
else
return read_doc_string (val);
}
return val;
}
return Fsignal (Qinvalid_read_syntax, Fcons (make_string (". in wrong context", 18), Qnil));
@ -1783,7 +1874,12 @@ OBARRAY defaults to the value of the variable `obarray'.")
hash = oblookup_last_bucket_number;
if (EQ (XVECTOR (obarray)->contents[hash], tem))
XSETSYMBOL (XVECTOR (obarray)->contents[hash], XSYMBOL (tem)->next);
{
if (XSYMBOL (tem)->next)
XSETSYMBOL (XVECTOR (obarray)->contents[hash], XSYMBOL (tem)->next);
else
XSETINT (XVECTOR (obarray)->contents[hash], 0);
}
else
{
Lisp_Object tail, following;
@ -2266,6 +2362,11 @@ or variables, and cons cells `(provide . FEATURE)' and `(require . FEATURE)'.");
The default is nil, which means use the function `read'.");
Vload_read_function = Qnil;
DEFVAR_BOOL ("load-force-doc-strings", &load_force_doc_strings,
"Non-nil means `load' should force-load all dynamic doc strings.\n\
This is useful when the file being loaded is a temporary copy.");
load_force_doc_strings = 0;
load_descriptor_list = Qnil;
staticpro (&load_descriptor_list);