X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fparse-scm.cc;h=d18afa9d816219740e3de9d63930cbbbe330bc14;hb=47db9a3883d726ca53e2133a3b2298f78dd6a32e;hp=f55be9829d81635f017a5bddaefdc3aa1996ec16;hpb=e344ae579fa1d81fc6c6f3049494697872fd39f9;p=lilypond.git diff --git a/lily/parse-scm.cc b/lily/parse-scm.cc index f55be9829d..d18afa9d81 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--2015 Han-Wen Nienhuys - (c) 2004--2008 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" @@ -12,60 +23,58 @@ 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 */ SCM internal_ly_parse_scm (Parse_start *ps) { - Source_file *sf = ps->start_location_.get_source_file (); + Input &hi = ps->location_; + Source_file *sf = hi.get_source_file (); SCM port = sf->get_port (); - int off = ps->start_location_.start () - sf->c_str (); + long off = hi.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 form = scm_read (port); + scm_set_port_line_x (port, scm_from_int (hi.line_number () - 1)); + scm_set_port_column_x (port, scm_from_int (hi.column_number () - 1)); + + bool multiple = ly_is_equal (scm_peek_char (port), SCM_MAKE_CHAR ('@')); - /* Reset read_buf for scm_ftell. - Shouldn't scm_read () do this for us? */ - scm_fill_input (port); + 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. */ + hi.set (hi.get_source_file (), + hi.start (), + hi.start () + scm_to_int (scm_difference (to, from))); + 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); - } - - // 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()); - 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 form; } /* Don't close the port here; if we re-enter this function via a @@ -74,30 +83,53 @@ internal_ly_parse_scm (Parse_start *ps) 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 catch_protected_parse_body (void *p) { - Parse_start *ps = (Parse_start *) p; + return internal_ly_parse_scm (static_cast (p)); +} - return internal_ly_parse_scm (ps); +SCM +catch_protected_eval_body (void *p) +{ + return internal_ly_eval_scm (static_cast (p)); } SCM -parse_handler (void *data, SCM tag, SCM args) +parse_handler (void *data, SCM /*tag*/, SCM args) { Parse_start *ps = (Parse_start *) data; - ps->start_location_.error (_ ("GUILE signaled an error for the expression beginning here")); + ps->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 ()); - if (tag == ly_symbol2scm ("read-error")) - ps->nchars = 1; - return SCM_UNDEFINED; } @@ -107,30 +139,47 @@ 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); +} + +SCM +protected_ly_eval_scm (Parse_start *ps) +{ + /* + Catch #t : catch all Scheme level errors. + */ + return scm_internal_catch (SCM_BOOL_T, + catch_protected_eval_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, Lily_parser *parser) +ly_parse_scm (Input &i, bool safe, Lily_parser *parser) { - Parse_start ps; - ps.str = s; - ps.start_location_ = i; - ps.safe_ = safe; - ps.parser_ = parser; + Parse_start ps (SCM_UNDEFINED, i, safe, parser); SCM ans = parse_protect_global ? protected_ly_parse_scm (&ps) - : internal_ly_parse_scm (&ps); - *n = ps.nchars; + : internal_ly_parse_scm (&ps); return ans; } +SCM +ly_eval_scm (SCM form, Input i, bool safe, Lily_parser *parser) +{ + Parse_start ps (form, i, safe, parser); + + SCM ans = parse_protect_global ? protected_ly_eval_scm (&ps) + : internal_ly_eval_scm (&ps); + scm_remember_upto_here_1 (form); + return ans; +}