#include <stdio.h>
#include "_scm.h"
#include "libpath.h"
+#include "fports.h"
+#include "read.h"
+#include "eval.h"
+#include "throw.h"
+
+#include "load.h"
#include <sys/types.h>
#include <sys/stat.h>
\f
/* Loading a file, given an absolute filename. */
-SCM_PROC(s_sys_try_load, "%try-load", 1, 2, 0, scm_sys_try_load);
+/* Hook to run when we load a file, perhaps to announce the fact somewhere.
+ Applied to the full name of the file. */
+static SCM *scm_loc_load_hook;
+
+SCM_PROC(s_primitive_load, "primitive-load", 1, 2, 0, scm_primitive_load);
SCM
-scm_sys_try_load (filename, case_insensitive_p, sharp)
+scm_primitive_load (filename, case_insensitive_p, sharp)
SCM filename;
SCM case_insensitive_p;
SCM sharp;
{
+ SCM hook = *scm_loc_load_hook;
SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
- SCM_ARG1, s_sys_try_load);
+ SCM_ARG1, s_primitive_load);
+ SCM_ASSERT (hook == SCM_BOOL_F
+ || (scm_procedure_p (hook) == SCM_BOOL_T),
+ hook, "value of %load-hook is neither a procedure nor #f",
+ s_primitive_load);
+
+ if (hook != SCM_BOOL_F)
+ scm_apply (hook, scm_listify (filename, SCM_UNDEFINED), SCM_EOL);
+
{
SCM form, port;
port = scm_open_file (filename,
scm_makfromstr ("r", (scm_sizet) sizeof (char), 0));
- if (SCM_FALSEP (port))
- return SCM_BOOL_F;
while (1)
{
form = scm_read (port, case_insensitive_p, sharp);
}
scm_close_port (port);
}
- return SCM_BOOL_T;
+ return SCM_UNSPECIFIED;
+}
+
+\f
+/* Builtin path to scheme library files. */
+#ifdef SCM_PKGDATA_DIR
+SCM_PROC (s_sys_package_data_dir, "%package-data-dir", 0, 0, 0, scm_sys_package_data_dir);
+SCM
+scm_sys_package_data_dir ()
+{
+ return scm_makfrom0str (SCM_PKGDATA_DIR);
}
+#endif /* SCM_PKGDATA_DIR */
\f
/* Initializing the load path, and searching it. */
+/* List of names of directories we search for files to load. */
static SCM *scm_loc_load_path;
+/* List of extensions we try adding to the filenames. */
+static SCM *scm_loc_load_extensions;
+
/* Initialize the global variable %load-path, given the value of the
- LIBRARY_PATH preprocessor symbol and the SCHEME_LOAD_PATH
- environment variable. */
+ SCM_SITE_DIR and SCM_LIBRARY_DIR preprocessor symbols and the
+ SCHEME_LOAD_PATH environment variable. */
void
scm_init_load_path ()
{
SCM path = SCM_EOL;
-#ifdef LIBRARY_PATH
- path = scm_cons (scm_makfrom0str (LIBRARY_PATH), path);
-#endif /* LIBRARY_PATH */
+#ifdef SCM_LIBRARY_DIR
+ path = scm_cons2 (scm_makfrom0str (SCM_SITE_DIR),
+ scm_makfrom0str (SCM_LIBRARY_DIR),
+ path);
+#endif /* SCM_LIBRARY_DIR */
{
char *path_string = getenv ("SCHEME_LOAD_PATH");
/* Search %load-path for a directory containing a file named FILENAME.
The file must be readable, and not a directory.
- If we find one, return its full filename; otherwise, return #f. */
+ If we find one, return its full filename; otherwise, return #f.
+ If FILENAME is absolute, return it unchanged. */
SCM_PROC(s_sys_search_load_path, "%search-load-path", 1, 0, 0, scm_sys_search_load_path);
SCM
scm_sys_search_load_path (filename)
SCM filename;
{
SCM path = *scm_loc_load_path;
+ SCM exts = *scm_loc_load_extensions;
char *buf;
- int buf_size;
int filename_len;
+ int max_path_len;
+ int max_ext_len;
SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
SCM_ARG1, s_sys_search_load_path);
+ SCM_ASSERT (scm_ilength (path) >= 0, path, "load path is not a proper list",
+ s_sys_search_load_path);
+ SCM_ASSERT (scm_ilength (exts) >= 0, exts,
+ "load extension list is not a proper list",
+ s_sys_search_load_path);
filename_len = SCM_ROLENGTH (filename);
+ /* If FILENAME is absolute, return it unchanged. */
+ if (filename_len >= 1
+ && SCM_ROCHARS (filename)[0] == '/')
+ return filename;
+
+ /* Find the length of the longest element of path. */
+ {
+ SCM walk;
+
+ max_path_len = 0;
+ for (walk = path; SCM_NIMP (walk); walk = SCM_CDR (walk))
+ {
+ SCM elt = SCM_CAR (walk);
+ SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt,
+ "load path is not a list of strings",
+ s_sys_search_load_path);
+ if (SCM_LENGTH (elt) > max_path_len)
+ max_path_len = SCM_LENGTH (elt);
+ }
+ }
+
+ /* Find the length of the longest element of the load extensions
+ list. */
+ {
+ SCM walk;
+
+ max_ext_len = 0;
+ for (walk = exts; SCM_NIMP (walk); walk = SCM_CDR (walk))
+ {
+ SCM elt = SCM_CAR (walk);
+ SCM_ASSERT (SCM_NIMP (elt) && SCM_ROSTRINGP (elt), elt,
+ "load extension list is not a list of strings",
+ s_sys_search_load_path);
+ if (SCM_LENGTH (elt) > max_ext_len)
+ max_ext_len = SCM_LENGTH (elt);
+ }
+ }
+
SCM_DEFER_INTS;
- buf_size = 80;
- buf = scm_must_malloc (buf_size, s_sys_search_load_path);
+ buf = scm_must_malloc (max_path_len + 1 + filename_len + max_ext_len + 1,
+ s_sys_search_load_path);
- while (SCM_NIMP (path) && SCM_CONSP (path))
+ /* Try every path element. At this point, we know it's a proper
+ list of strings. */
+ for (; SCM_NIMP (path); path = SCM_CDR (path))
{
- SCM elt = SCM_CAR (path);
- if (SCM_NIMP (elt) && SCM_ROSTRINGP (elt))
+ SCM path_elt = SCM_CAR (path);
+
+ /* Try every extension. At this point, we know it's a proper
+ list of strings. */
+ for (exts = *scm_loc_load_extensions;
+ SCM_NIMP (exts);
+ exts = SCM_CDR (exts))
{
- int len = SCM_ROLENGTH (elt) + 1 + filename_len;
-
- if (len + 1 > buf_size)
- {
- int old_size = buf_size;
- buf_size = len + 50;
- buf = scm_must_realloc (buf, old_size, buf_size,
- s_sys_search_load_path);
- }
-
- memcpy (buf, SCM_ROCHARS (elt), SCM_ROLENGTH (elt));
- buf[SCM_ROLENGTH (elt)] = '/';
- memcpy (buf + SCM_ROLENGTH (elt) + 1,
- SCM_ROCHARS (filename), filename_len);
- buf[len] = '\0';
+ SCM ext_elt = SCM_CAR (exts);
+ int i;
+
+ /* Concatenate the path name, the filename, and the extension. */
+ i = SCM_ROLENGTH (path_elt);
+ memcpy (buf, SCM_ROCHARS (path_elt), i);
+ if (i >= 1 && buf[i - 1] != '/')
+ buf[i++] = '/';
+ memcpy (buf + i, SCM_ROCHARS (filename), filename_len);
+ i += filename_len;
+ memcpy (buf + i, SCM_ROCHARS (ext_elt), SCM_LENGTH (ext_elt));
+ i += SCM_LENGTH (ext_elt);
+ buf[i] = '\0';
{
struct stat mode;
&& ! (mode.st_mode & S_IFDIR)
&& access (buf, R_OK) == 0)
{
- SCM result = scm_makfromstr (buf, len, 0);
+ SCM result = scm_makfromstr (buf, i, 0);
scm_must_free (buf);
SCM_ALLOW_INTS;
return result;
}
}
}
-
- path = SCM_CDR (path);
}
scm_must_free (buf);
}
-SCM_PROC(s_sys_try_load_path, "%try-load-path", 1, 2, 0,scm_sys_try_load_path);
+SCM_PROC(s_primitive_load_path, "primitive-load-path", 1, 2, 0, scm_primitive_load_path);
SCM
-scm_sys_try_load_path (filename, case_insensitive_p, sharp)
+scm_primitive_load_path (filename, case_insensitive_p, sharp)
SCM filename;
SCM case_insensitive_p;
SCM sharp;
{
- SCM full_filename = scm_sys_search_load_path (filename);
+ SCM full_filename;
+
+ SCM_ASSERT (SCM_NIMP (filename) && SCM_ROSTRINGP (filename), filename,
+ SCM_ARG1, s_primitive_load_path);
+
+ full_filename = scm_sys_search_load_path (filename);
+
+ if (SCM_FALSEP (full_filename))
+ {
+ int absolute = (SCM_LENGTH (filename) >= 1
+ && SCM_ROCHARS (filename)[0] == '/');
+ scm_misc_error (s_primitive_load_path,
+ (absolute
+ ? "Unable to load file %S"
+ : "Unable to find file %S in load path"),
+ scm_listify (filename, SCM_UNDEFINED));
+ }
+
+ return scm_primitive_load (full_filename, case_insensitive_p, sharp);
+}
+
+/* The following function seems trivial - and indeed it is. Its
+ * existence is motivated by its ability to evaluate expressions
+ * without copying them first (as is done in "eval").
+ */
- if (SCM_NIMP (full_filename) && SCM_ROSTRINGP (full_filename))
- return scm_sys_try_load (full_filename, case_insensitive_p, sharp);
- else
- return scm_sys_try_load (filename, case_insensitive_p, sharp);
+SCM_SYMBOL (scm_end_of_file_key, "end-of-file");
+
+SCM_PROC (s_read_and_eval_x, "read-and-eval!", 0, 3, 0, scm_read_and_eval_x);
+
+SCM
+scm_read_and_eval_x (port, case_insensitive_p, sharp)
+ SCM port;
+ SCM case_insensitive_p;
+ SCM sharp;
+{
+ SCM form = scm_read (port, case_insensitive_p, sharp);
+ if (form == SCM_EOF_VAL)
+ scm_ithrow (scm_end_of_file_key, SCM_EOL, 1);
+ return scm_eval_x (form);
}
\f
void
scm_init_load ()
{
- scm_loc_load_path = &SCM_CDR(scm_sysintern("%load-path", SCM_EOL));
+ scm_loc_load_path = SCM_CDRLOC(scm_sysintern("%load-path", SCM_EOL));
+ scm_loc_load_extensions
+ = SCM_CDRLOC(scm_sysintern("%load-extensions",
+ scm_listify (scm_makfrom0str (""),
+ scm_makfrom0str (".scm"),
+ SCM_UNDEFINED)));
+ scm_loc_load_hook = SCM_CDRLOC(scm_sysintern("%load-hook", SCM_BOOL_F));
#include "load.x"
}
HCoop / bpt / guile.git / blobdiff