3 #include "ly-module.hh"
4 #include "lily-guile.hh"
6 #include "paper-book.hh"
7 #include "parse-scm.hh"
9 #include "source-file.hh"
11 /* Pass string to scm parser, evaluate one expression.
12 Return result value and #chars read.
14 Thanks to Gary Houston <ghouston@freewire.co.uk> */
16 internal_ly_parse_scm (Parse_start * ps)
18 Source_file *sf =ps->start_location_.source_file_;
19 SCM port = sf->get_port ();
21 int off = ps->start_location_.defined_str0_ - sf->to_str0 ();
23 scm_seek (port, scm_long2num (off), scm_long2num (SEEK_SET));
24 SCM from = scm_ftell (port);
27 SCM answer = SCM_UNSPECIFIED;
29 /* Read expression from port. */
30 if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
32 SCM function = ly_scheme_function ("make-safe-lilypond-module");
34 answer = scm_eval (form, function);
36 answer = scm_primitive_eval (form);
39 /* Reset read_buf for scm_ftell.
40 Shouldn't scm_read () do this for us? */
41 scm_fill_input (port);
42 SCM to = scm_ftell (port);
43 ps->nchars = ly_scm2int (to) - ly_scm2int (from);
45 /* Don't close the port here; if we re-enter this function via a
46 continuation, then the next time we enter it, we'll get an error.
47 It's a string port anyway, so there's no advantage to closing it
49 // scm_close_port (port);
55 catch_protected_parse_body (void *p)
57 Parse_start *ps = (Parse_start*) p;
59 return internal_ly_parse_scm (ps);
63 parse_handler (void *data, SCM tag, SCM args)
65 Parse_start* ps = (Parse_start *) data;
68 ps->start_location_.error (_("GUILE signaled an error for the expression beginning here"));
70 if (scm_ilength (args) > 2)
71 scm_display_error_message (ly_cadr (args), ly_caddr (args), scm_current_error_port ());
74 The following is a kludge; we should probably search for
75 [a-z][0-9] (a note), and start before that.
83 Do some magical incantations: if not, lily will exit on the first
84 GUILE error, leaving no location trace.
88 #if GUILE_MINOR_VERSION < 7
89 #define READ_ERROR "misc-error"
91 #define READ_ERROR "read-error"
95 protected_ly_parse_scm (Parse_start *ps)
97 return scm_internal_catch (ly_symbol2scm (READ_ERROR),
98 &catch_protected_parse_body,
100 &parse_handler, (void*) ps);
103 bool parse_protect_global = true;
105 /* Try parsing. Upon failure return SCM_UNDEFINED.
106 FIXME: shouldn't we return SCM_UNSCPECIFIED -- jcn */
108 ly_parse_scm (char const *s, int *n, Input i, bool safe)
112 ps.start_location_ = i;
115 SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps)
116 : internal_ly_parse_scm (&ps);