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680155d3f0
* lisp/editorconfig-conf-mode.el: * lisp/editorconfig-core-handle.el: * lisp/editorconfig-core.el: * lisp/editorconfig-fnmatch.el: * lisp/editorconfig-tools.el: Declare library as part of the 'editorconfig' package.
295 lines
11 KiB
EmacsLisp
295 lines
11 KiB
EmacsLisp
;;; editorconfig-fnmatch.el --- Glob pattern matching -*- lexical-binding: t -*-
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;; Copyright (C) 2011-2024 Free Software Foundation, Inc.
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;; Author: EditorConfig Team <editorconfig@googlegroups.com>
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;; Package: editorconfig
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;; See
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;; https://github.com/editorconfig/editorconfig-emacs/graphs/contributors or
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;; https://github.com/editorconfig/editorconfig-emacs/blob/master/CONTRIBUTORS
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;; for the list of contributors.
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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;; See the GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; editorconfig-fnmatch.el provides a fnmatch implementation with a few
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;; extensions.
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;; The main usage of this library is glob pattern matching for EditorConfig, but
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;; it can also act solely.
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;; editorconfig-fnmatch-p (name pattern)
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;; Test whether NAME match PATTERN.
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;; PATTERN should be a shell glob pattern, and some zsh-like wildcard matchings
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;; can be used:
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;; * Matches any string of characters, except path separators (/)
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;; ** Matches any string of characters
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;; ? Matches any single character
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;; [name] Matches any single character in name
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;; [^name] Matches any single character not in name
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;; {s1,s2,s3} Matches any of the strings given (separated by commas)
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;; {min..max} Matches any number between min and max
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;; This library is a port from editorconfig-core-py library.
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;; https://github.com/editorconfig/editorconfig-core-py/blob/master/editorconfig/fnmatch.py
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;;; Code:
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(require 'cl-lib)
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(defvar editorconfig-fnmatch--cache-hashtable
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nil
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"Cache of shell pattern and its translation.")
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;; Clear cache on file reload
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(setq editorconfig-fnmatch--cache-hashtable
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(make-hash-table :test 'equal))
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(defconst editorconfig-fnmatch--left-brace-regexp
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"\\(^\\|[^\\]\\){"
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"Regular expression for left brace ({).")
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(defconst editorconfig-fnmatch--right-brace-regexp
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"\\(^\\|[^\\]\\)}"
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"Regular expression for right brace (}).")
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(defconst editorconfig-fnmatch--numeric-range-regexp
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"\\([+-]?[0-9]+\\)\\.\\.\\([+-]?[0-9]+\\)"
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"Regular expression for numeric range (like {-3..+3}).")
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(defun editorconfig-fnmatch--match-num (regexp string)
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"Return how many times REGEXP is found in STRING."
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(let ((num 0))
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;; START arg does not work as expected in this case
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(while (string-match regexp string)
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(setq num (1+ num)
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string (substring string (match-end 0))))
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num))
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(defun editorconfig-fnmatch-p (string pattern)
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"Test whether STRING match PATTERN.
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Matching ignores case if `case-fold-search' is non-nil.
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PATTERN should be a shell glob pattern, and some zsh-like wildcard matchings can
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be used:
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* Matches any string of characters, except path separators (/)
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** Matches any string of characters
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? Matches any single character
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[name] Matches any single character in name
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[^name] Matches any single character not in name
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{s1,s2,s3} Matches any of the strings given (separated by commas)
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{min..max} Matches any number between min and max"
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(string-match (editorconfig-fnmatch-translate pattern)
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string))
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;;(editorconfig-fnmatch-translate "{a,{-3..3}}.js")
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;;(editorconfig-fnmatch-p "1.js" "{a,{-3..3}}.js")
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(defun editorconfig-fnmatch-translate (pattern)
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"Translate a shell PATTERN to a regular expression.
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Translation result will be cached, so same translation will not be done twice."
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(let ((cached (gethash pattern
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editorconfig-fnmatch--cache-hashtable)))
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(or cached
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(puthash pattern
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(editorconfig-fnmatch--do-translate pattern)
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editorconfig-fnmatch--cache-hashtable))))
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(defun editorconfig-fnmatch--do-translate (pattern &optional nested)
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"Translate a shell PATTERN to a regular expression.
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Set NESTED to t when this function is called from itself.
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This function is called from `editorconfig-fnmatch-translate', when no cached
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translation is found for PATTERN."
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(let ((index 0)
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(length (length pattern))
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(brace-level 0)
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(in-brackets nil)
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;; List of strings of resulting regexp, in reverse order.
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(result ())
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(is-escaped nil)
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(matching-braces (= (editorconfig-fnmatch--match-num
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editorconfig-fnmatch--left-brace-regexp
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pattern)
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(editorconfig-fnmatch--match-num
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editorconfig-fnmatch--right-brace-regexp
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pattern)))
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current-char
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pos
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has-slash
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has-comma
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num-range)
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(while (< index length)
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(if (and (not is-escaped)
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(string-match "[^]\\*?[{},/-]+"
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;;(string-match "[^]\\*?[{},/\\-]+" "?.a")
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pattern
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index)
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(eq index (match-beginning 0)))
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(progn
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(push (regexp-quote (match-string 0 pattern)) result)
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(setq index (match-end 0)
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is-escaped nil))
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(setq current-char (aref pattern index)
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index (1+ index))
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(cl-case current-char
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(?*
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(setq pos index)
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(if (and (< pos length)
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(= (aref pattern pos) ?*))
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(push ".*" result)
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(push "[^/]*" result)))
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(??
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(push "[^/]" result))
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(?\[
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(if in-brackets
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(push "\\[" result)
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(if (= (aref pattern index) ?/)
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;; Slash after an half-open bracket
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(progn
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(push "\\[/" result)
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(setq index (+ index 1)))
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(setq pos index
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has-slash nil)
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(while (and (< pos length)
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(not (= (aref pattern pos) ?\]))
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(not has-slash))
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(if (and (= (aref pattern pos) ?/)
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(not (= (aref pattern (- pos 1)) ?\\)))
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(setq has-slash t)
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(setq pos (1+ pos))))
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(if has-slash
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(progn
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(push (concat "\\["
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(substring pattern
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index
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(1+ pos))
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"\\]")
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result)
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(setq index (+ pos 2)))
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(if (and (< index length)
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(memq (aref pattern index)
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'(?! ?^)))
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(progn
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(setq index (1+ index))
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(push "[^" result))
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(push "[" result))
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(setq in-brackets t)))))
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(?-
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(if in-brackets
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(push "-" result)
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(push "\\-" result)))
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(?\]
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(push "]" result)
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(setq in-brackets nil))
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(?{
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(setq pos index
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has-comma nil)
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(while (and (or (and (< pos length)
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(not (= (aref pattern pos) ?})))
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is-escaped)
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(not has-comma))
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(if (and (eq (aref pattern pos) ?,)
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(not is-escaped))
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(setq has-comma t)
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(setq is-escaped (and (eq (aref pattern pos)
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?\\)
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(not is-escaped))
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pos (1+ pos))))
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(if (and (not has-comma)
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(< pos length))
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(let ((pattern-sub (substring pattern index pos)))
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(setq num-range (string-match editorconfig-fnmatch--numeric-range-regexp
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pattern-sub))
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(if num-range
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(let ((number-start (string-to-number (match-string 1
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pattern-sub)))
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(number-end (string-to-number (match-string 2
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pattern-sub))))
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(push (concat "\\(?:"
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(mapconcat #'number-to-string
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(cl-loop for i from number-start to number-end
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collect i)
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"\\|")
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"\\)")
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result))
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(let ((inner (editorconfig-fnmatch--do-translate pattern-sub t)))
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(push (format "{%s}" inner) result)))
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(setq index (1+ pos)))
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(if matching-braces
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(progn
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(push "\\(?:" result)
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(setq brace-level (1+ brace-level)))
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(push "{" result))))
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(?,
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(if (and (> brace-level 0)
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(not is-escaped))
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(push "\\|" result)
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(push "\\," result)))
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(?}
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(if (and (> brace-level 0)
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(not is-escaped))
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(progn
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(push "\\)" result)
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(setq brace-level (- brace-level 1)))
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(push "}" result)))
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(?/
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(if (and (<= (+ index 3) (length pattern))
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(string= (substring pattern index (+ index 3)) "**/"))
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(progn
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(push "\\(?:/\\|/.*/\\)" result)
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(setq index (+ index 3)))
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(push "/" result)))
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(t
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(unless (= current-char ?\\)
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(push (regexp-quote (char-to-string current-char)) result))))
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(if (= current-char ?\\)
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(progn (when is-escaped
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(push "\\\\" result))
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(setq is-escaped (not is-escaped)))
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(setq is-escaped nil))))
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(unless nested
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(setq result `("\\'" ,@result "\\`")))
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(apply #'concat (reverse result))))
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(provide 'editorconfig-fnmatch)
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;;; editorconfig-fnmatch.el ends here
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