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, bool safe)
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)))
34 static SCM safe_module;
37 safe_module = scm_primitive_eval (ly_symbol2scm ("safe-module"));
38 if (output_format_global == PAGE_LAYOUT)
39 ly_import_module (safe_module, scm_c_resolve_module ("lily"));
41 answer = scm_eval (form, safe_module);
44 answer = scm_primitive_eval (form);
47 /* Reset read_buf for scm_ftell.
48 Shouldn't scm_read () do this for us? */
49 scm_fill_input (port);
50 SCM to = scm_ftell (port);
51 ps->nchars = ly_scm2int (to) - ly_scm2int (from);
53 /* Don't close the port here; if we re-enter this function via a
54 continuation, then the next time we enter it, we'll get an error.
55 It's a string port anyway, so there's no advantage to closing it
57 // scm_close_port (port);
63 catch_protected_parse_body (void *p)
65 Parse_start *ps = (Parse_start*) p;
66 return internal_ly_parse_scm (ps, false);
70 safe_catch_protected_parse_body (void *p)
72 Parse_start *ps = (Parse_start*) p;
73 return internal_ly_parse_scm (ps, true);
77 parse_handler (void * data, SCM tag, SCM args)
79 Parse_start* ps = (Parse_start*) data;
80 (void) tag; // prevent warning
82 ps->start_location_.error (_("GUILE signaled an error for the expression beginning here"));
84 if (scm_ilength (args) > 2)
85 scm_display_error_message (ly_cadr (args), ly_caddr (args), scm_current_error_port ());
88 The following is a kludge; we should probably search for
89 [a-z][0-9] (a note), and start before that.
97 Do some magical incantations: if not, lily will exit on the first
98 GUILE error, leaving no location trace.
102 #if GUILE_MINOR_VERSION < 7
103 #define READ_ERROR "misc-error"
105 #define READ_ERROR "read-error"
109 protected_ly_parse_scm (Parse_start *ps, bool safe)
111 return scm_internal_catch (ly_symbol2scm (READ_ERROR),
112 (safe ? &safe_catch_protected_parse_body
113 : catch_protected_parse_body),
115 &parse_handler, (void*) ps);
118 bool parse_protect_global = true;
120 /* Try parsing. Upon failure return SCM_UNDEFINED. */
122 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);