+/*
+ parse-scm -- Parse a single SCM expression exactly.
+
+ source file of the GNU LilyPond music typesetter
+
+ (c) 2004--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
+*/
-#include "lily-guile.hh"
#include "parse-scm.hh"
-#include "string.hh"
+#include <cstdio>
+using namespace std;
-/*
- Pass string to scm parser, evaluate one expression.
- Return result value and #chars read.
+#include "lily-parser.hh"
+#include "international.hh"
+#include "main.hh"
+#include "paper-book.hh"
+#include "source-file.hh"
- Thanks to Gary Houston <ghouston@freewire.co.uk>
+/* Pass string to scm parser, evaluate one expression.
+ Return result value and #chars read.
- Need guile-1.3.4 (>1.3 anyway) for ftell on str ports -- jcn
-*/
+ Thanks to Gary Houston <ghouston@freewire.co.uk> */
SCM
-internal_ly_parse_scm (Parse_start * ps)
+internal_ly_parse_scm (Parse_start *ps)
{
- SCM str = ly_str02scm (ps->str);
- SCM port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_RDNG,
- "ly_eval_scm_0str");
+ Source_file *sf = ps->start_location_.get_source_file ();
+ SCM port = sf->get_port ();
- scm_set_port_filename_x (port, scm_makfrom0str (ps->start_location.file_string ().get_str0()));
- scm_set_port_line_x (port, gh_int2scm (ps->start_location.line_number ()));
- scm_set_port_column_x (port, gh_int2scm (ps->start_location.column_number()));
-
+ int off = ps->start_location_.start () - sf->c_str ();
+
+ scm_seek (port, scm_long2num (off), scm_long2num (SEEK_SET));
SCM from = scm_ftell (port);
- SCM form;
+ scm_set_port_line_x (port, scm_from_int (ps->start_location_.line_number () -1));
+ scm_set_port_column_x (port, scm_from_int (ps->start_location_.column_number () -1));
+
SCM answer = SCM_UNSPECIFIED;
+ SCM form = scm_read (port);
- /* Read expression from port */
- if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
- answer = scm_primitive_eval (form);
-
- /*
- After parsing
-
- (begin (foo 1 2))
-
- all seems fine, but after parsing
-
- (foo 1 2)
-
- read_buf has been advanced to read_pos - 1,
- so that scm_ftell returns 1, instead of #parsed chars
- */
-
- /*
- urg: reset read_buf for scm_ftell
- shouldn't scm_read () do this for us?
- */
+ /* Reset read_buf for scm_ftell.
+ Shouldn't scm_read () do this for us? */
scm_fill_input (port);
SCM to = scm_ftell (port);
- ps->nchars = gh_scm2int (to) - gh_scm2int (from);
+ ps->nchars = scm_to_int (to) - scm_to_int (from);
+
+
+ /* Read expression from port. */
+ if (!SCM_EOF_OBJECT_P (form))
+ {
+ if (ps->safe_)
+ {
+ static SCM module = SCM_BOOL_F;
+ if (module == SCM_BOOL_F)
+ {
+ SCM function = ly_lily_module_constant ("make-safe-lilypond-module");
+ module = scm_call_0 (function);
+ }
+
+ // We define the parser so trusted Scheme functions can
+ // access the real namespace underlying the parser.
+ if (ps->parser_)
+ scm_module_define (module, ly_symbol2scm ("parser"),
+ ps->parser_->self_scm());
+ answer = scm_eval (form, module);
+ }
+ else
+ answer = scm_primitive_eval (form);
+ }
/* Don't close the port here; if we re-enter this function via a
continuation, then the next time we enter it, we'll get an error.
It's a string port anyway, so there's no advantage to closing it
- early.
-
- scm_close_port (port);
- */
+ early. */
+ // scm_close_port (port);
return answer;
}
-
SCM
catch_protected_parse_body (void *p)
{
- Parse_start *ps = (Parse_start*) p;
+ Parse_start *ps = (Parse_start *) p;
+
return internal_ly_parse_scm (ps);
}
-SCM
-parse_handler (void * data, SCM tag, SCM args)
+SCM
+parse_handler (void *data, SCM tag, SCM args)
{
- Parse_start* ps = (Parse_start*) data;
+ Parse_start *ps = (Parse_start *) data;
- ps->start_location.error (_("GUILE signaled an error for the expression begining here"));
+ ps->start_location_.error (_ ("GUILE signaled an error for the expression beginning here"));
if (scm_ilength (args) > 2)
- scm_display_error_message (gh_cadr (args), gh_caddr(args), scm_current_error_port());
+ scm_display_error_message (scm_cadr (args), scm_caddr (args), scm_current_error_port ());
- /*
- The following is a kludge; we should probably search for
- [a-z][0-9] (a note), and start before that.
- */
- ps->nchars = 1;
-
- return SCM_EOL;
+ if (tag == ly_symbol2scm ("read-error"))
+ ps->nchars = 1;
+
+ return SCM_UNDEFINED;
}
-/*
- Do some magical incantations: if not, lily will exit on the first
- GUILE error, leaving no location trace.
- */
SCM
protected_ly_parse_scm (Parse_start *ps)
{
- return scm_internal_catch (ly_symbol2scm ("misc-error"), &catch_protected_parse_body,
- (void*)ps,
- &parse_handler, (void*)ps);
-
+ /*
+ Catch #t : catch all Scheme level errors.
+ */
+ return scm_internal_catch (SCM_BOOL_T,
+ &catch_protected_parse_body,
+ (void *) ps,
+ &parse_handler, (void *) ps);
}
+bool parse_protect_global = true;
+bool parsed_objects_should_be_dead = false;
+/* Try parsing. Upon failure return SCM_UNDEFINED.
+ FIXME: shouldn't we return SCM_UNSCPECIFIED -- jcn */
SCM
-ly_parse_scm (char const* s, int *n, Input i)
+ly_parse_scm (char const *s, int *n, Input i, bool safe, Lily_parser *parser)
{
- Parse_start ps ;
+ Parse_start ps;
ps.str = s;
- ps.start_location = i;
+ ps.start_location_ = i;
+ ps.safe_ = safe;
+ ps.parser_ = parser;
- SCM ans = protected_ly_parse_scm (&ps);
+ SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps)
+ : internal_ly_parse_scm (&ps);
*n = ps.nchars;
- return ans;
+
+ return ans;
}
projects / lilypond.git / blobdiff