3 #include "lily-guile.hh"
4 #include "parse-scm.hh"
6 #include "source-file.hh"
9 Pass string to scm parser, evaluate one expression.
10 Return result value and #chars read.
12 Thanks to Gary Houston <ghouston@freewire.co.uk>
14 Need guile-1.3.4 (>1.3 anyway) for ftell on str ports -- jcn
17 internal_ly_parse_scm (Parse_start * ps, bool safe)
19 Source_file* sf =ps->start_location_.source_file_;
20 SCM port = sf->get_port();
22 int off = ps->start_location_.defined_str0_ - sf->to_str0();
24 scm_seek (port, scm_long2num (off), scm_long2num (SEEK_SET));
25 SCM from = scm_ftell (port);
28 SCM answer = SCM_UNSPECIFIED;
30 /* Read expression from port */
31 if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
35 SCM safe_module = scm_primitive_eval (ly_symbol2scm ("safe-module"));
36 answer = scm_eval (form, safe_module);
39 answer = scm_primitive_eval (form);
42 /* Reset read_buf for scm_ftell.
43 Shouldn't scm_read () do this for us? */
44 scm_fill_input (port);
45 SCM to = scm_ftell (port);
46 ps->nchars = gh_scm2int (to) - gh_scm2int (from);
48 /* Don't close the port here; if we re-enter this function via a
49 continuation, then the next time we enter it, we'll get an error.
50 It's a string port anyway, so there's no advantage to closing it
52 // scm_close_port (port);
58 catch_protected_parse_body (void *p)
60 Parse_start *ps = (Parse_start*) p;
61 return internal_ly_parse_scm (ps, false);
65 safe_catch_protected_parse_body (void *p)
67 Parse_start *ps = (Parse_start*) p;
68 return internal_ly_parse_scm (ps, true);
72 parse_handler (void * data, SCM tag, SCM args)
74 Parse_start* ps = (Parse_start*) data;
76 ps->start_location_.error (_("GUILE signaled an error for the expression beginning here"));
78 if (scm_ilength (args) > 2)
79 scm_display_error_message (gh_cadr (args), gh_caddr(args), scm_current_error_port());
82 The following is a kludge; we should probably search for
83 [a-z][0-9] (a note), and start before that.
91 Do some magical incantations: if not, lily will exit on the first
92 GUILE error, leaving no location trace.
96 #if GUILE_MINOR_VERSION < 7
97 #define READ_ERROR "misc-error"
99 #define READ_ERROR "read-error"
103 protected_ly_parse_scm (Parse_start *ps, bool safe)
105 return scm_internal_catch (ly_symbol2scm (READ_ERROR),
106 (safe ? &safe_catch_protected_parse_body
107 : catch_protected_parse_body),
109 &parse_handler, (void*)ps);
112 bool parse_protect_global = true;
115 Try parsing. If failure, then return SCM_UNDEFINED.
118 ly_parse_scm (char const* s, int *n, Input i, bool safe)
123 ps.start_location_ = i;
125 SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps, safe)
126 : internal_ly_parse_scm (&ps, safe);