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;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: LW-ADD-ONS; Base: 10 -*-
;;; $Header: /usr/local/cvsrep/lw-add-ons/completions.lisp,v 1.14 2015/03/06 12:54:25 edi Exp $
;;; Copyright (c) 2005-2015, Dr. Edmund Weitz. All rights reserved.
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;; * Redistributions in binary form must reproduce the above
;;; copyright notice, this list of conditions and the following
;;; disclaimer in the documentation and/or other materials
;;; provided with the distribution.
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;; This code copied almost verbatim from SLIME, see
;;; <http://common-lisp.net/project/slime/>
(in-package :lw-add-ons)
(defun compound-prefix-match (prefix target)
"Return true if PREFIX is a compound-prefix of TARGET.
Viewing each of PREFIX and TARGET as a series of substrings delimited
by hyphens, if each substring of PREFIX is a prefix of the
corresponding substring in TARGET then we call PREFIX a
compound-prefix of TARGET.
Examples:
\(compound-prefix-match \"foo\" \"foobar\") => t
\(compound-prefix-match \"m--b\" \"multiple-value-bind\") => t
\(compound-prefix-match \"m-v-c\" \"multiple-value-bind\") => NIL"
(declare (type simple-string prefix target))
(loop for ch across prefix
with tpos = 0
always (and (< tpos (length target))
(if (char= ch #\-)
(setf tpos (position #\- target :start tpos))
(char= ch (aref target tpos))))
do (incf tpos)))
;; FIXME: deal with #\| etc. hard to do portably.
(defun tokenize-symbol (string)
(let ((package (let ((pos (position #\: string)))
(if pos (subseq string 0 pos) nil)))
(symbol (let ((pos (position #\: string :from-end t)))
(if pos (subseq string (1+ pos)) string)))
(internp (search "::" string)))
(values symbol package internp)))
(defun parse-package (string)
"Find the package named STRING.
Return the package or nil."
(multiple-value-bind (name pos)
(if (zerop (length string))
(values :|| 0)
(let ((*package* +keyword-package+))
(ignore-errors* (read-from-string string))))
(if (and (or (keywordp name) (stringp name))
(= (length string) pos))
(find-package name))))
(defun guess-package-from-string (name &optional (default-package *package*))
(or (and name
(or (parse-package name)
(find-package (string-upcase name))
(parse-package (substitute #\- #\! name))))
default-package))
(defun carefully-find-package (name default-package-name)
"Find the package with name NAME, or DEFAULT-PACKAGE-NAME, or
the CL-USER package. NAME and DEFAULT-PACKAGE-NAME can be nil."
(let ((string (cond ((equal name "") "KEYWORD")
(t (or name default-package-name)))))
(if string
(guess-package-from-string string nil)
+cl-user-package+)))
(defun parse-completion-arguments (string default-package-name)
"Parse STRING as a symbol designator.
Return these values:
SYMBOL-NAME
PACKAGE-NAME, or nil if the designator does not include an explicit package.
PACKAGE, the package to complete in
INTERNAL-P, if the symbol is qualified with `::'."
(multiple-value-bind (name package-name internal-p)
(tokenize-symbol string)
(let ((package (carefully-find-package package-name default-package-name)))
(values name package-name package internal-p))))
(defun determine-case (string)
"Return two booleans LOWER and UPPER indicating whether STRING
contains lower or upper case characters."
(values (some #'lower-case-p string)
(some #'upper-case-p string)))
(defun output-case-converter (input)
"Return a function to case convert strings for output.
INPUT is used to guess the preferred case."
(ecase (readtable-case *readtable*)
(:upcase (if (some #'lower-case-p input) #'string-downcase #'identity))
(:invert (lambda (output)
(multiple-value-bind (lower upper) (determine-case output)
(cond ((and lower upper) output)
(lower (string-upcase output))
(upper (string-downcase output))
(t output)))))
(:downcase (if (some #'upper-case-p input) #'string-upcase #'identity))
(:preserve #'identity)))
(defun symbol-external-p (symbol &optional (package (symbol-package symbol)))
"True if SYMBOL is external in PACKAGE.
If PACKAGE is not specified, the home package of SYMBOL is used."
(unless package
(setq package (symbol-package symbol)))
(when package
(multiple-value-bind (_ status)
(find-symbol (symbol-name symbol) package)
(declare (ignore _))
(eq status :external))))
(defun find-matching-symbols (string package external test)
"Return a list of symbols in PACKAGE matching STRING.
TEST is called with two strings. If EXTERNAL is true, only external
symbols are returned."
(let ((completions '())
(converter (output-case-converter string)))
(flet ((symbol-matches-p (symbol)
(and (or (not external)
(symbol-external-p symbol package))
(funcall test string
(funcall converter (symbol-name symbol))))))
(do-symbols (symbol package)
(when (symbol-matches-p symbol)
(push symbol completions))))
(delete-duplicates completions)))
(defun find-matching-packages (name matcher)
"Return a list of package names matching NAME using the fuzzy
completion algorithm."
(let ((to-match (string-upcase name)))
(remove-if-not (lambda (x) (funcall matcher to-match x))
(mapcar (lambda (pkgname)
(concatenate 'string pkgname ":"))
(loop for package in (list-all-packages)
collect (package-name package)
append (package-nicknames package))))))
(defun format-completion-result (string internal-p package-name)
(let ((prefix (cond (internal-p (format nil "~A::" package-name))
(package-name (format nil "~A:" package-name))
(t ""))))
(values (concatenate 'string prefix string)
(length prefix))))
(defun format-completion-set (strings internal-p package-name)
"Format a set of completion strings.
Returns a list of completions with package qualifiers if needed."
(mapcar (lambda (string)
(format-completion-result string internal-p package-name))
(sort strings #'string<)))
(defun completion-set (string default-package-name matchp)
"Return the set of completion-candidates as strings."
(multiple-value-bind (name package-name package internal-p)
(parse-completion-arguments string default-package-name)
(let* ((symbols (and package
(find-matching-symbols name
package
(and (not internal-p)
package-name)
matchp)))
(packs (and (not package-name)
(find-matching-packages name matchp)))
(converter (output-case-converter name))
(strings
(mapcar converter
(nconc (mapcar #'symbol-name symbols) packs))))
(format-completion-set strings internal-p package-name))))
(defun longest-common-prefix (strings)
"Return the longest string that is a common prefix of STRINGS."
(if (null strings)
""
(flet ((common-prefix (s1 s2)
(let ((diff-pos (mismatch s1 s2)))
(if diff-pos (subseq s1 0 diff-pos) s1))))
(reduce #'common-prefix strings))))
(defun transpose-lists (lists)
"Turn a list-of-lists on its side.
If the rows are of unequal length, truncate uniformly to the shortest.
For example:
\(transpose-lists '((ONE TWO THREE) (1 2)))
=> ((ONE 1) (TWO 2))"
(cond ((null lists) '())
((some #'null lists) '())
(t (cons (mapcar #'car lists)
(transpose-lists (mapcar #'cdr lists))))))
(defun untokenize-completion (tokens)
(format nil "~{~A~^-~}" tokens))
(defun tokenize-completion (string)
"Return all substrings of STRING delimited by #\-."
(loop with end
for start = 0 then (1+ end)
until (> start (length string))
do (setq end (or (position #\- string :start start) (length string)))
collect (subseq string start end)))
(defun longest-completion (completions)
"Return the longest prefix for all COMPLETIONS.
COMPLETIONS is a list of strings."
(untokenize-completion
(mapcar #'longest-common-prefix
(transpose-lists (mapcar #'tokenize-completion completions)))))
(defun completions (string default-package-name)
"Return a list of completions for a symbol designator STRING.
The result is the list \(COMPLETION-SET
COMPLETED-PREFIX). COMPLETION-SET is the list of all matching
completions, and COMPLETED-PREFIX is the best (partial)
completion of the input string.
If STRING is package qualified the result list will also be
qualified. If string is non-qualified the result strings are
also not qualified and are considered relative to
DEFAULT-PACKAGE-NAME.
The way symbols are matched depends on the symbol designator's
format. The cases are as follows:
FOO - Symbols with matching prefix and accessible in the buffer package.
PKG:FOO - Symbols with matching prefix and external in package PKG.
PKG::FOO - Symbols with matching prefix and accessible in package PKG."
(let ((completion-set (completion-set string default-package-name
*completion-match-function*)))
(values completion-set (longest-completion completion-set))))
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