2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 2004--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
6 LilyPond is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 LilyPond is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
20 #include "parse-scm.hh"
25 #include "lily-parser.hh"
26 #include "international.hh"
28 #include "paper-book.hh"
29 #include "source-file.hh"
31 /* Pass string to scm parser, evaluate one expression.
32 Return result value and #chars read.
34 Thanks to Gary Houston <ghouston@freewire.co.uk> */
36 internal_ly_parse_scm (Parse_start *ps)
38 Source_file *sf = ps->start_location_.get_source_file ();
39 SCM port = sf->get_port ();
41 int off = ps->start_location_.start () - sf->c_str ();
43 scm_seek (port, scm_from_long (off), scm_from_long (SEEK_SET));
44 SCM from = scm_ftell (port);
46 scm_set_port_line_x (port, scm_from_int (ps->start_location_.line_number () - 1));
47 scm_set_port_column_x (port, scm_from_int (ps->start_location_.column_number () - 1));
49 SCM answer = SCM_UNSPECIFIED;
50 SCM form = scm_read (port);
52 SCM to = scm_ftell (port);
53 ps->nchars = scm_to_int (to) - scm_to_int (from);
55 /* Read expression from port. */
56 if (!SCM_EOF_OBJECT_P (form))
58 if (ps->parser_ && !SCM_UNBNDP (ps->parser_->local_environment_))
59 answer = scm_local_eval (form, ps->parser_->local_environment_);
62 static SCM module = SCM_BOOL_F;
63 if (module == SCM_BOOL_F)
65 SCM function = ly_lily_module_constant ("make-safe-lilypond-module");
66 module = scm_call_0 (function);
69 // We define the parser so trusted Scheme functions can
70 // access the real namespace underlying the parser.
72 scm_module_define (module, ly_symbol2scm ("parser"),
73 ps->parser_->self_scm ());
74 answer = scm_eval (form, module);
77 answer = scm_primitive_eval (form);
80 /* Don't close the port here; if we re-enter this function via a
81 continuation, then the next time we enter it, we'll get an error.
82 It's a string port anyway, so there's no advantage to closing it
84 // scm_close_port (port);
90 catch_protected_parse_body (void *p)
92 Parse_start *ps = (Parse_start *) p;
94 return internal_ly_parse_scm (ps);
98 parse_handler (void *data, SCM tag, SCM args)
100 Parse_start *ps = (Parse_start *) data;
102 ps->start_location_.error (_ ("GUILE signaled an error for the expression beginning here"));
104 if (scm_ilength (args) > 2)
105 scm_display_error_message (scm_cadr (args), scm_caddr (args), scm_current_error_port ());
107 if (tag == ly_symbol2scm ("read-error"))
110 return SCM_UNDEFINED;
114 protected_ly_parse_scm (Parse_start *ps)
117 Catch #t : catch all Scheme level errors.
119 return scm_internal_catch (SCM_BOOL_T,
120 &catch_protected_parse_body,
122 &parse_handler, (void *) ps);
125 bool parse_protect_global = true;
126 bool parsed_objects_should_be_dead = false;
128 /* Try parsing. Upon failure return SCM_UNDEFINED.
129 FIXME: shouldn't we return SCM_UNSCPECIFIED -- jcn */
131 ly_parse_scm (char const *s, int *n, Input i, bool safe, Lily_parser *parser)
135 ps.start_location_ = i;
139 SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps)
140 : internal_ly_parse_scm (&ps);