| 1 | ;;; -*-lisp-*- |
| 2 | ;;; |
| 3 | ;;; Top-level parser for module syntax |
| 4 | ;;; |
| 5 | ;;; (c) 2010 Straylight/Edgeware |
| 6 | ;;; |
| 7 | |
| 8 | ;;;----- Licensing notice --------------------------------------------------- |
| 9 | ;;; |
| 10 | ;;; This file is part of the Sensble Object Design, an object system for C. |
| 11 | ;;; |
| 12 | ;;; SOD is free software; you can redistribute it and/or modify |
| 13 | ;;; it under the terms of the GNU General Public License as published by |
| 14 | ;;; the Free Software Foundation; either version 2 of the License, or |
| 15 | ;;; (at your option) any later version. |
| 16 | ;;; |
| 17 | ;;; SOD is distributed in the hope that it will be useful, |
| 18 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | ;;; GNU General Public License for more details. |
| 21 | ;;; |
| 22 | ;;; You should have received a copy of the GNU General Public License |
| 23 | ;;; along with SOD; if not, write to the Free Software Foundation, |
| 24 | ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | |
| 26 | (in-package #:sod) |
| 27 | |
| 28 | ;;;-------------------------------------------------------------------------- |
| 29 | ;;; Toplevel syntax. |
| 30 | |
| 31 | (export 'module) |
| 32 | |
| 33 | ;;; Type names. |
| 34 | |
| 35 | (define-pluggable-parser module typename (scanner) |
| 36 | ;; `typename' ID ( `,' ID )* `;' |
| 37 | |
| 38 | (with-parser-context (token-scanner-context :scanner scanner) |
| 39 | (parse (and "typename" |
| 40 | (skip-many (:min 1) |
| 41 | (seq ((id :id)) |
| 42 | (if (gethash id *module-type-map*) |
| 43 | (cerror* "Type `~A' already defined" id) |
| 44 | (add-to-module *module* |
| 45 | (make-instance 'type-item |
| 46 | :name id)))) |
| 47 | #\,) |
| 48 | #\;)))) |
| 49 | |
| 50 | ;;; Fragments. |
| 51 | |
| 52 | (define-pluggable-parser module code (scanner) |
| 53 | ;; `code' ID `:' ID [ CONSTRAINTS ] `{' C-FRAGMENT `}' |
| 54 | |
| 55 | (with-parser-context (token-scanner-context :scanner scanner) |
| 56 | (parse (seq ("code" |
| 57 | (reason :id) |
| 58 | #\: |
| 59 | (name :id) |
| 60 | (constraints (? (seq (#\[ |
| 61 | (constraints (list (:min 1) |
| 62 | (list (:min 1) :id) |
| 63 | #\,)) |
| 64 | #\]) |
| 65 | constraints))) |
| 66 | (fragment (parse-delimited-fragment scanner #\{ #\}))) |
| 67 | (add-to-module *module* (make-instance 'code-fragment-item |
| 68 | :fragment fragment |
| 69 | :constraints constraints |
| 70 | :reason reason |
| 71 | :name name)))))) |
| 72 | |
| 73 | ;;; External files. |
| 74 | |
| 75 | (defun read-module (pathname &key (truename (truename pathname)) location) |
| 76 | "Parse the file at PATHNAME as a module, returning it. |
| 77 | |
| 78 | This is the main entry point for parsing module files. You may well know |
| 79 | the file's TRUENAME already (e.g., because `probe-file' dropped it into |
| 80 | your lap) so you can avoid repeating the search by providing it. |
| 81 | |
| 82 | The LOCATION is the thing which wanted the module imported -- usually a |
| 83 | `file-location' object, though it might be anything other than `t' which |
| 84 | can be printed in the event of circular imports." |
| 85 | |
| 86 | (define-module (pathname :location location :truename truename) |
| 87 | (with-open-file (f-stream pathname :direction :input) |
| 88 | (let* ((*readtable* (copy-readtable)) |
| 89 | (char-scanner (make-instance 'charbuf-scanner |
| 90 | :stream f-stream)) |
| 91 | (scanner (make-instance 'sod-token-scanner |
| 92 | :char-scanner char-scanner))) |
| 93 | (with-default-error-location (scanner) |
| 94 | (with-parser-context (token-scanner-context :scanner scanner) |
| 95 | (parse (skip-many () (plug module scanner))))))))) |
| 96 | |
| 97 | (define-pluggable-parser module test (scanner) |
| 98 | ;; `demo' STRING `;' |
| 99 | |
| 100 | (with-parser-context (token-scanner-context :scanner scanner) |
| 101 | (parse (seq ("demo" (string :string) #\;) |
| 102 | (format t ";; DEMO ~S~%" string))))) |
| 103 | |
| 104 | (define-pluggable-parser module file (scanner) |
| 105 | ;; `import' STRING `;' |
| 106 | ;; `load' STRING `;' |
| 107 | |
| 108 | (flet ((common (name type what thunk) |
| 109 | (find-file scanner |
| 110 | (merge-pathnames name |
| 111 | (make-pathname :type type |
| 112 | :case :common)) |
| 113 | what |
| 114 | thunk))) |
| 115 | (with-parser-context (token-scanner-context :scanner scanner) |
| 116 | (parse (or (seq ("import" (name :string) #\;) |
| 117 | (common name "SOD" "module" |
| 118 | (lambda (path true) |
| 119 | (handler-case |
| 120 | (let ((module (read-module path |
| 121 | :truename true))) |
| 122 | (when module |
| 123 | (module-import module) |
| 124 | (pushnew module |
| 125 | (module-dependencies |
| 126 | *module*)))) |
| 127 | (file-error (error) |
| 128 | (cerror* "Error reading module ~S: ~A" |
| 129 | path error)))))) |
| 130 | (seq ("load" (name :string) #\;) |
| 131 | (common name "LISP" "Lisp file" |
| 132 | (lambda (path true) |
| 133 | (handler-case |
| 134 | (load true :verbose nil :print nil) |
| 135 | (error (error) |
| 136 | (cerror* "Error loading Lisp file ~S: ~A" |
| 137 | path error))))))))))) |
| 138 | |
| 139 | ;;; Lisp escape. |
| 140 | |
| 141 | (define-pluggable-parser module lisp (scanner) |
| 142 | ;; `lisp' s-expression `;' |
| 143 | |
| 144 | (with-parser-context (token-scanner-context :scanner scanner) |
| 145 | (parse (seq ((sexp (if (and (eql (token-type scanner) :id) |
| 146 | (string= (token-value scanner) "lisp")) |
| 147 | (let* ((stream (make-scanner-stream scanner)) |
| 148 | (sexp (read stream t))) |
| 149 | (scanner-step scanner) |
| 150 | (values sexp t t)) |
| 151 | (values '((:id "lisp")) nil nil))) |
| 152 | #\;) |
| 153 | (eval sexp))))) |
| 154 | |
| 155 | ;;;-------------------------------------------------------------------------- |
| 156 | ;;; Class declarations. |
| 157 | |
| 158 | (define-pluggable-parser module class (scanner) |
| 159 | ;; `class' id [`:' id-list] `{' class-item* `}' |
| 160 | |
| 161 | (with-parser-context (token-scanner-context :scanner scanner) |
| 162 | (labels ((parse-item () |
| 163 | ;; class-item ::= property-set |
| 164 | (parse (seq ("class" |
| 165 | (name :id) |
| 166 | (supers (? (seq (#\: (supers (list (:min 1) :id #\,))) |
| 167 | supers))) |
| 168 | #\{ |
| 169 | |
| 170 | |
| 171 | ;;;----- That's all, folks -------------------------------------------------- |