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 "lily-lexer.hh"
27 #include "international.hh"
29 #include "paper-book.hh"
30 #include "source-file.hh"
32 /* Pass string to scm parser, read one expression.
33 Return result value and #chars read.
35 Thanks to Gary Houston <ghouston@freewire.co.uk> */
37 internal_ly_parse_scm (Parse_start *ps)
39 Source_file *sf = ps->start_location_.get_source_file ();
40 SCM port = sf->get_port ();
42 long off = ps->start_location_.start () - sf->c_str ();
44 scm_seek (port, scm_from_long (off), scm_from_long (SEEK_SET));
45 SCM from = scm_ftell (port);
47 scm_set_port_line_x (port, scm_from_int (ps->start_location_.line_number () - 1));
48 scm_set_port_column_x (port, scm_from_int (ps->start_location_.column_number () - 1));
50 SCM form = scm_read (port);
52 SCM to = scm_ftell (port);
53 ps->nchars = scm_to_int (to) - scm_to_int (from);
55 if (!SCM_EOF_OBJECT_P (form))
57 if (ps->parser_->lexer_->top_input ())
59 // Find any precompiled form.
60 SCM c = scm_assv_ref (ps->parser_->closures_, from);
62 // Replace form with a call to previously compiled closure
63 form = scm_list_1 (c);
65 return scm_cons (form, make_input (ps->start_location_));
68 /* Don't close the port here; if we re-enter this function via a
69 continuation, then the next time we enter it, we'll get an error.
70 It's a string port anyway, so there's no advantage to closing it
72 // scm_close_port (port);
78 internal_ly_eval_scm (Parse_start *ps)
82 static SCM module = SCM_BOOL_F;
83 if (module == SCM_BOOL_F)
85 SCM function = ly_lily_module_constant ("make-safe-lilypond-module");
86 module = scm_gc_protect_object (scm_call_0 (function));
89 // We define the parser so trusted Scheme functions can
90 // access the real namespace underlying the parser.
92 scm_module_define (module, ly_symbol2scm ("parser"),
93 ps->parser_->self_scm ());
94 return scm_eval (ps->form_, module);
96 return scm_primitive_eval (ps->form_);
100 catch_protected_parse_body (void *p)
102 Parse_start *ps = (Parse_start *) p;
104 return (*ps->func_) (ps);
108 parse_handler (void *data, SCM tag, SCM args)
110 Parse_start *ps = (Parse_start *) data;
112 ps->start_location_.error (_ ("GUILE signaled an error for the expression beginning here"));
114 if (scm_ilength (args) > 2)
115 scm_display_error_message (scm_cadr (args), scm_caddr (args), scm_current_error_port ());
117 if (tag == ly_symbol2scm ("read-error"))
120 return SCM_UNDEFINED;
124 protected_ly_parse_scm (Parse_start *ps)
127 Catch #t : catch all Scheme level errors.
129 return scm_internal_catch (SCM_BOOL_T,
130 &catch_protected_parse_body,
132 &parse_handler, (void *) ps);
135 bool parse_protect_global = true;
136 bool parsed_objects_should_be_dead = false;
138 /* Try parsing. Upon failure return SCM_UNDEFINED. */
141 ly_parse_scm (char const *s, int *n, Input i, bool safe, Lily_parser *parser)
145 ps.start_location_ = i;
147 ps.form_ = SCM_UNDEFINED;
149 ps.func_ = internal_ly_parse_scm;
151 SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps)
152 : internal_ly_parse_scm (&ps);
159 ly_eval_scm (SCM form, Input i, bool safe, Lily_parser *parser)
163 ps.start_location_ = i;
167 ps.func_ = internal_ly_eval_scm;
169 SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps)
170 : internal_ly_eval_scm (&ps);
171 scm_remember_upto_here_1 (form);