X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fparse-scm.cc;h=58348dc63274ec4f82ea2f75c0b79c2c2d6606ea;hb=9e781b7dc83b60a543ce218aa1a5f139f74c760f;hp=c4d535d85dbe94b3be7833b40997bc16d06c7479;hpb=bc01e841f1a486ec8bf55010af3f987a7df5caad;p=lilypond.git diff --git a/lily/parse-scm.cc b/lily/parse-scm.cc index c4d535d85d..58348dc632 100644 --- a/lily/parse-scm.cc +++ b/lily/parse-scm.cc @@ -1,9 +1,20 @@ /* - parse-scm -- Parse a single SCM expression exactly. + This file is part of LilyPond, the GNU music typesetter. - source file of the GNU LilyPond music typesetter + Copyright (C) 2004--2014 Han-Wen Nienhuys - (c) 2004--2007 Han-Wen Nienhuys + LilyPond is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + LilyPond is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with LilyPond. If not, see . */ #include "parse-scm.hh" @@ -11,12 +22,14 @@ #include using namespace std; +#include "lily-parser.hh" +#include "lily-lexer.hh" #include "international.hh" #include "main.hh" #include "paper-book.hh" #include "source-file.hh" -/* Pass string to scm parser, evaluate one expression. +/* Pass string to scm parser, read one expression. Return result value and #chars read. Thanks to Gary Houston */ @@ -26,47 +39,70 @@ internal_ly_parse_scm (Parse_start *ps) Source_file *sf = ps->start_location_.get_source_file (); SCM port = sf->get_port (); - int off = ps->start_location_.start () - sf->c_str (); + long off = ps->start_location_.start () - sf->c_str (); - scm_seek (port, scm_long2num (off), scm_long2num (SEEK_SET)); + scm_seek (port, scm_from_long (off), scm_from_long (SEEK_SET)); SCM from = scm_ftell (port); - scm_set_port_line_x (port, scm_from_int (ps->start_location_.line_number () -1)); - scm_set_port_column_x (port, scm_from_int (ps->start_location_.column_number () -1)); - - SCM answer = SCM_UNSPECIFIED; + scm_set_port_line_x (port, scm_from_int (ps->start_location_.line_number () - 1)); + scm_set_port_column_x (port, scm_from_int (ps->start_location_.column_number () - 1)); + + bool multiple = ly_is_equal (scm_peek_char (port), SCM_MAKE_CHAR ('@')); + + if (multiple) + (void) scm_read_char (port); + SCM form = scm_read (port); + SCM to = scm_ftell (port); + + ps->nchars = scm_to_int (to) - scm_to_int (from); - /* Read expression from port. */ if (!SCM_EOF_OBJECT_P (form)) { - if (ps->safe_) - { - static SCM module = SCM_BOOL_F; - if (module == SCM_BOOL_F) - { - SCM function = ly_lily_module_constant ("make-safe-lilypond-module"); - module = scm_call_0 (function); - } - answer = scm_eval (form, module); - } - else - answer = scm_primitive_eval (form); + if (ps->parser_->lexer_->top_input ()) + { + // Find any precompiled form. + SCM c = scm_assv_ref (ps->parser_->closures_, from); + if (scm_is_true (c)) + // Replace form with a call to previously compiled closure + form = scm_list_1 (c); + } + if (multiple) + form = scm_list_3 (ly_symbol2scm ("apply"), + ly_symbol2scm ("values"), + form); + return scm_cons (form, make_input (ps->start_location_)); } - /* Reset read_buf for scm_ftell. - Shouldn't scm_read () do this for us? */ - scm_fill_input (port); - SCM to = scm_ftell (port); - ps->nchars = scm_to_int (to) - scm_to_int (from); - /* Don't close the port here; if we re-enter this function via a continuation, then the next time we enter it, we'll get an error. It's a string port anyway, so there's no advantage to closing it early. */ // scm_close_port (port); - return answer; + return SCM_UNDEFINED; +} + +SCM +internal_ly_eval_scm (Parse_start *ps) +{ + if (ps->safe_) + { + static SCM module = SCM_BOOL_F; + if (module == SCM_BOOL_F) + { + SCM function = ly_lily_module_constant ("make-safe-lilypond-module"); + module = scm_gc_protect_object (scm_call_0 (function)); + } + + // We define the parser so trusted Scheme functions can + // access the real namespace underlying the parser. + if (ps->parser_) + scm_module_define (module, ly_symbol2scm ("parser"), + ps->parser_->self_scm ()); + return scm_eval (ps->form_, module); + } + return scm_primitive_eval (ps->form_); } SCM @@ -74,25 +110,21 @@ catch_protected_parse_body (void *p) { Parse_start *ps = (Parse_start *) p; - return internal_ly_parse_scm (ps); + return (*ps->func_) (ps); } SCM parse_handler (void *data, SCM tag, SCM args) { Parse_start *ps = (Parse_start *) data; - (void) tag; ps->start_location_.error (_ ("GUILE signaled an error for the expression beginning here")); if (scm_ilength (args) > 2) scm_display_error_message (scm_cadr (args), scm_caddr (args), scm_current_error_port ()); - /* - The following is a kludge; we should probably search for - [a-z][0-9] (a note), and start before that. - */ - ps->nchars = 1; + if (tag == ly_symbol2scm ("read-error")) + ps->nchars = 1; return SCM_UNDEFINED; } @@ -103,29 +135,48 @@ protected_ly_parse_scm (Parse_start *ps) /* Catch #t : catch all Scheme level errors. */ - return scm_internal_catch (SCM_BOOL_T, - &catch_protected_parse_body, - (void *) ps, - &parse_handler, (void *) ps); + return scm_internal_catch (SCM_BOOL_T, + &catch_protected_parse_body, + (void *) ps, + &parse_handler, (void *) ps); } bool parse_protect_global = true; bool parsed_objects_should_be_dead = false; -/* Try parsing. Upon failure return SCM_UNDEFINED. - FIXME: shouldn't we return SCM_UNSCPECIFIED -- jcn */ +/* Try parsing. Upon failure return SCM_UNDEFINED. */ + SCM -ly_parse_scm (char const *s, int *n, Input i, bool safe) +ly_parse_scm (char const *s, int *n, Input i, bool safe, Lily_parser *parser) { Parse_start ps; ps.str = s; ps.start_location_ = i; ps.safe_ = safe; + ps.form_ = SCM_UNDEFINED; + ps.parser_ = parser; + ps.func_ = internal_ly_parse_scm; SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps) - : internal_ly_parse_scm (&ps); + : internal_ly_parse_scm (&ps); *n = ps.nchars; return ans; } +SCM +ly_eval_scm (SCM form, Input i, bool safe, Lily_parser *parser) +{ + Parse_start ps; + ps.str = 0; + ps.start_location_ = i; + ps.safe_ = safe; + ps.form_ = form; + ps.parser_ = parser; + ps.func_ = internal_ly_eval_scm; + + SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps) + : internal_ly_eval_scm (&ps); + scm_remember_upto_here_1 (form); + return ans; +}