1 files changed, 84 insertions, 0 deletions
diff --git a/src/geiser/xref.scm b/src/geiser/xref.scm
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+;;; xref.scm -- cross-referencing utilities
+
+;; Copyright (C) 2009, 2010, 2020 Jose Antonio Ortega Ruiz
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the Modified BSD License. You should
+;; have received a copy of the license along with this program. If
+;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
+
+;; Start date: Mon Mar 02, 2009 02:37
+
+(define-module (geiser xref)
+  #:export (symbol-location
+            generic-methods
+            callers
+            callees
+            find-file)
+  #:use-module (geiser utils)
+  #:use-module (geiser modules)
+  #:use-module (geiser doc)
+  #:use-module (oop goops)
+  #:use-module (system xref)
+  #:use-module (system vm program))
+
+(define (symbol-location sym)
+  (let ((obj (symbol->object sym)))
+    (cond ((program? obj) (program-location obj))
+          ((symbol-module sym) => module-location)
+          (else '()))))
+
+(define (generic-methods sym)
+  (let* ((gen (symbol->object sym))
+         (methods (if (is-a? gen <generic>)
+                      (generic-function-methods gen)
+                      '())))
+    (filter (lambda (x) (not (null? x)))
+            (map (lambda (m)
+                   (make-xref (method-procedure m) sym (symbol-module sym)))
+                 methods))))
+
+(define (make-xref proc name module)
+  (and proc
+       `(("location" . ,(or (program-location proc) (symbol-location name)))
+         ("signature" . ,(object-signature name proc))
+         ("module" . ,(or module '())))))
+
+(define (program-location p)
+  (cond ((not (program? p)) #f)
+        ((program-source p 0) =>
+         (lambda (s) (make-location (program-path p) (source:line s))))
+        ((program-path p) => (lambda (s) (make-location s #f)))
+        (else #f)))
+
+(define (program-path p)
+  (let* ((mod (program-module p))
+         (name (and (module? mod) (module-name mod))))
+    (and name (module-path name))))
+
+(define (procedure-xref proc . mod-name)
+  (let* ((proc-name (or (procedure-name proc) '<anonymous>))
+         (mod-name (if (null? mod-name)
+                       (symbol-module proc-name)
+                       (car mod-name))))
+    (make-xref proc proc-name mod-name)))
+
+(define (callers sym)
+  (let ((mod (symbol-module sym #t)))
+    (and mod
+         (apply append (map (lambda (procs)
+                              (map (lambda (proc)
+                                     (procedure-xref proc (car procs)))
+                                   (cdr procs)))
+                            (procedure-callers (cons mod sym)))))))
+
+(define (callees sym)
+  (let ((obj (symbol->object sym)))
+    (and obj
+         (map procedure-xref (procedure-callees obj)))))
+
+(define (find-file path)
+  (let loop ((dirs %load-path))
+    (if (null? dirs) #f
+        (let ((candidate (string-append (car dirs) "/" path)))
+          (if (file-exists? candidate) candidate (loop (cdr dirs)))))))