3 #include "lily-guile.hh"
4 #include "parse-scm.hh"
6 #include "source-file.hh"
8 /* Pass string to scm parser, evaluate one expression.
9 Return result value and #chars read.
11 Thanks to Gary Houston <ghouston@freewire.co.uk> */
13 internal_ly_parse_scm (Parse_start * ps, bool safe)
15 Source_file* sf =ps->start_location_.source_file_;
16 SCM port = sf->get_port ();
18 int off = ps->start_location_.defined_str0_ - sf->to_str0();
20 scm_seek (port, scm_long2num (off), scm_long2num (SEEK_SET));
21 SCM from = scm_ftell (port);
24 SCM answer = SCM_UNSPECIFIED;
26 /* Read expression from port */
27 if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
31 static SCM safe_module;
33 safe_module = scm_primitive_eval (ly_symbol2scm ("safe-module"));
34 answer = scm_eval (form, safe_module);
37 answer = scm_primitive_eval (form);
40 /* Reset read_buf for scm_ftell.
41 Shouldn't scm_read () do this for us? */
42 scm_fill_input (port);
43 SCM to = scm_ftell (port);
44 ps->nchars = gh_scm2int (to) - gh_scm2int (from);
46 /* Don't close the port here; if we re-enter this function via a
47 continuation, then the next time we enter it, we'll get an error.
48 It's a string port anyway, so there's no advantage to closing it
50 // scm_close_port (port);
56 catch_protected_parse_body (void *p)
58 Parse_start *ps = (Parse_start*) p;
59 return internal_ly_parse_scm (ps, false);
63 safe_catch_protected_parse_body (void *p)
65 Parse_start *ps = (Parse_start*) p;
66 return internal_ly_parse_scm (ps, true);
70 parse_handler (void * data, SCM tag, SCM args)
72 Parse_start* ps = (Parse_start*) data;
74 ps->start_location_.error (_("GUILE signaled an error for the expression beginning here"));
76 if (scm_ilength (args) > 2)
77 scm_display_error_message (gh_cadr (args), gh_caddr (args), scm_current_error_port ());
80 The following is a kludge; we should probably search for
81 [a-z][0-9] (a note), and start before that.
89 Do some magical incantations: if not, lily will exit on the first
90 GUILE error, leaving no location trace.
94 #if GUILE_MINOR_VERSION < 7
95 #define READ_ERROR "misc-error"
97 #define READ_ERROR "read-error"
101 protected_ly_parse_scm (Parse_start *ps, bool safe)
103 return scm_internal_catch (ly_symbol2scm (READ_ERROR),
104 (safe ? &safe_catch_protected_parse_body
105 : catch_protected_parse_body),
107 &parse_handler, (void*)ps);
110 bool parse_protect_global = true;
113 Try parsing. If failure, then return SCM_UNDEFINED.
116 ly_parse_scm (char const* s, int *n, Input i, bool safe)
121 ps.start_location_ = i;
123 SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps, safe)
124 : internal_ly_parse_scm (&ps, safe);