2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 2004--2015 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 "lily-lexer.hh"
27 #include "international.hh"
29 #include "paper-book.hh"
30 #include "source-file.hh"
31 #include "lily-imports.hh"
33 /* Pass string to scm parser, read one expression.
34 Return result value and #chars read.
36 Thanks to Gary Houston <ghouston@freewire.co.uk> */
38 internal_ly_parse_scm (Parse_start *ps)
40 Input &hi = ps->location_;
41 Source_file *sf = hi.get_source_file ();
42 SCM port = sf->get_port ();
44 long off = hi.start () - sf->c_str ();
46 scm_seek (port, scm_from_long (off), scm_from_long (SEEK_SET));
47 SCM from = scm_ftell (port);
49 scm_set_port_line_x (port, scm_from_int (hi.line_number () - 1));
50 scm_set_port_column_x (port, scm_from_int (hi.column_number () - 1));
52 bool multiple = ly_is_equal (scm_peek_char (port), SCM_MAKE_CHAR ('@'));
55 (void) scm_read_char (port);
57 SCM form = scm_read (port);
58 SCM to = scm_ftell (port);
60 hi.set (hi.get_source_file (),
62 hi.start () + scm_to_int (scm_difference (to, from)));
64 if (!SCM_EOF_OBJECT_P (form))
66 if (ps->parser_->lexer_->top_input ())
68 // Find any precompiled form.
69 SCM c = scm_assv_ref (ps->parser_->closures_, from);
71 // Replace form with a call to previously compiled closure
72 form = scm_list_1 (c);
75 form = scm_list_3 (ly_symbol2scm ("apply"),
76 ly_symbol2scm ("values"),
81 /* Don't close the port here; if we re-enter this function via a
82 continuation, then the next time we enter it, we'll get an error.
83 It's a string port anyway, so there's no advantage to closing it
85 // scm_close_port (port);
91 internal_ly_eval_scm (Parse_start *ps)
95 static SCM module = SCM_BOOL_F;
96 if (scm_is_false (module))
98 module = scm_gc_protect_object (Lily::make_safe_lilypond_module ());
101 return scm_eval (ps->form_, module);
103 return scm_primitive_eval (ps->form_);
107 catch_protected_parse_body (void *p)
109 return internal_ly_parse_scm (static_cast<Parse_start *> (p));
113 catch_protected_eval_body (void *p)
115 return internal_ly_eval_scm (static_cast<Parse_start *> (p));
119 parse_handler (void *data, SCM /*tag*/, SCM args)
121 Parse_start *ps = (Parse_start *) data;
123 ps->location_.non_fatal_error
124 (_ ("GUILE signaled an error for the expression beginning here"));
126 if (scm_ilength (args) > 2)
127 scm_display_error_message (scm_cadr (args), scm_caddr (args), scm_current_error_port ());
129 return SCM_UNDEFINED;
133 protected_ly_parse_scm (Parse_start *ps)
136 Catch #t : catch all Scheme level errors.
138 return scm_internal_catch (SCM_BOOL_T,
139 catch_protected_parse_body,
141 &parse_handler, (void *) ps);
145 protected_ly_eval_scm (void *ps)
148 Catch #t : catch all Scheme level errors.
150 return scm_internal_catch (SCM_BOOL_T,
151 catch_protected_eval_body,
156 bool parse_protect_global = true;
157 bool parsed_objects_should_be_dead = false;
159 /* Try parsing. Upon failure return SCM_UNDEFINED. */
162 ly_parse_scm (Input &i, bool safe, Lily_parser *parser)
164 Parse_start ps (SCM_UNDEFINED, i, safe, parser);
166 SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps)
167 : internal_ly_parse_scm (&ps);
173 ly_eval_scm (SCM form, Input i, bool safe, Lily_parser *parser)
175 Parse_start ps (form, i, safe, parser);
177 SCM ans = scm_c_with_fluid
180 parse_protect_global ? protected_ly_eval_scm
181 : catch_protected_eval_body, (void *) &ps);
183 scm_remember_upto_here_1 (form);