3 #include "ly-module.hh"
4 #include "lily-guile.hh"
5 #include "parse-scm.hh"
7 #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 internal_ly_parse_scm (Parse_start * ps, bool safe)
16 Source_file* sf =ps->start_location_.source_file_;
17 SCM port = sf->get_port ();
19 int off = ps->start_location_.defined_str0_ - sf->to_str0();
21 scm_seek (port, scm_long2num (off), scm_long2num (SEEK_SET));
22 SCM from = scm_ftell (port);
25 SCM answer = SCM_UNSPECIFIED;
27 /* Read expression from port */
28 if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
32 static SCM safe_module;
35 safe_module = scm_primitive_eval (ly_symbol2scm ("safe-module"));
36 if (output_format_global == PAGE_LAYOUT)
37 ly_import_module (safe_module, scm_c_resolve_module ("lily"));
39 answer = scm_eval (form, safe_module);
42 answer = scm_primitive_eval (form);
45 /* Reset read_buf for scm_ftell.
46 Shouldn't scm_read () do this for us? */
47 scm_fill_input (port);
48 SCM to = scm_ftell (port);
49 ps->nchars = gh_scm2int (to) - gh_scm2int (from);
51 /* Don't close the port here; if we re-enter this function via a
52 continuation, then the next time we enter it, we'll get an error.
53 It's a string port anyway, so there's no advantage to closing it
55 // scm_close_port (port);
61 catch_protected_parse_body (void *p)
63 Parse_start *ps = (Parse_start*) p;
64 return internal_ly_parse_scm (ps, false);
68 safe_catch_protected_parse_body (void *p)
70 Parse_start *ps = (Parse_start*) p;
71 return internal_ly_parse_scm (ps, true);
75 parse_handler (void * data, SCM tag, SCM args)
77 Parse_start* ps = (Parse_start*) data;
79 ps->start_location_.error (_("GUILE signaled an error for the expression beginning here"));
81 if (scm_ilength (args) > 2)
82 scm_display_error_message (gh_cadr (args), gh_caddr (args), scm_current_error_port ());
85 The following is a kludge; we should probably search for
86 [a-z][0-9] (a note), and start before that.
94 Do some magical incantations: if not, lily will exit on the first
95 GUILE error, leaving no location trace.
99 #if GUILE_MINOR_VERSION < 7
100 #define READ_ERROR "misc-error"
102 #define READ_ERROR "read-error"
106 protected_ly_parse_scm (Parse_start *ps, bool safe)
108 return scm_internal_catch (ly_symbol2scm (READ_ERROR),
109 (safe ? &safe_catch_protected_parse_body
110 : catch_protected_parse_body),
112 &parse_handler, (void*)ps);
115 bool parse_protect_global = true;
118 Try parsing. If failure, then return SCM_UNDEFINED.
121 ly_parse_scm (char const* s, int *n, Input i, bool safe)
126 ps.start_location_ = i;
128 SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps, safe)
129 : internal_ly_parse_scm (&ps, safe);