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 ly_import_module (safe_module, scm_c_resolve_module ("lily"));
40 answer = scm_eval (form, safe_module);
43 answer = scm_primitive_eval (form);
46 /* Reset read_buf for scm_ftell.
47 Shouldn't scm_read () do this for us? */
48 scm_fill_input (port);
49 SCM to = scm_ftell (port);
50 ps->nchars = ly_scm2int (to) - ly_scm2int (from);
52 /* Don't close the port here; if we re-enter this function via a
53 continuation, then the next time we enter it, we'll get an error.
54 It's a string port anyway, so there's no advantage to closing it
56 // scm_close_port (port);
62 catch_protected_parse_body (void *p)
64 Parse_start *ps = (Parse_start*) p;
65 return internal_ly_parse_scm (ps, false);
69 safe_catch_protected_parse_body (void *p)
71 Parse_start *ps = (Parse_start*) p;
72 return internal_ly_parse_scm (ps, true);
76 parse_handler (void * data, SCM tag, SCM args)
78 Parse_start* ps = (Parse_start*) data;
79 (void) tag; // prevent warning
81 ps->start_location_.error (_("GUILE signaled an error for the expression beginning here"));
83 if (scm_ilength (args) > 2)
84 scm_display_error_message (ly_cadr (args), ly_caddr (args), scm_current_error_port ());
87 The following is a kludge; we should probably search for
88 [a-z][0-9] (a note), and start before that.
96 Do some magical incantations: if not, lily will exit on the first
97 GUILE error, leaving no location trace.
101 #if GUILE_MINOR_VERSION < 7
102 #define READ_ERROR "misc-error"
104 #define READ_ERROR "read-error"
108 protected_ly_parse_scm (Parse_start *ps, bool safe)
110 return scm_internal_catch (ly_symbol2scm (READ_ERROR),
111 (safe ? &safe_catch_protected_parse_body
112 : catch_protected_parse_body),
114 &parse_handler, (void*) ps);
117 bool parse_protect_global = true;
119 /* Try parsing. Upon failure return SCM_UNDEFINED. */
121 ly_parse_scm (char const* s, int *n, Input i, bool safe)
125 ps.start_location_ = i;
127 SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps, safe)
128 : internal_ly_parse_scm (&ps, safe);