emacs - 替代前向词/后向词以包含符号——例如，***

Question

我首选的方法是用三个星号来指示文档中需要注意的位置 *** .当需要使用 shift+right-word 选择包含三个星号的区域时或 shift+left-word ，这些函数会跳过三个星号并移动到下一个单词。当我偷看里面时 bindings.el ，我看到了left-word和 right-word是 forward-word 的改编版和 backward-word ，可追溯到 C 源代码中的内置函数。基本上，我正在寻找 left-word和 right-word包括三个星号等符号 *** .

任何人都可以提出一种方法来让函数向左跳转一个单词或符号，向右跳转一个单词或符号。该函数的行为需要与左词和右词相似，以便在多次按下箭头键时我可以选择多个词——例如，left-word-or-symbols和 right-word-or-symbols .

以下是基于以下有用答案的自定义函数:

(defvar lawlist-movement-syntax-table
  (let ((st (make-syntax-table)))
    ;; ` default = punctuation
    ;; ' default = punctuation
    ;; , default = punctuation
    ;; ; default = punctuation
    (modify-syntax-entry ?{ "." st)  ;; { = punctuation
    (modify-syntax-entry ?} "." st)  ;; } = punctuation
    (modify-syntax-entry ?\" "." st) ;; " = punctuation
    (modify-syntax-entry ?\\ "_" st) ;; \ = symbol
    (modify-syntax-entry ?\$ "_" st) ;; $ = symbol
    (modify-syntax-entry ?\% "_" st) ;; % = symbol
    st)
  "Syntax table used while executing custom movement functions.")

(defun lawlist-forward-entity ()
"http://stackoverflow.com/q/18675201/2112489"
(interactive "^")
  (with-syntax-table lawlist-movement-syntax-table
    (cond
      ((eolp)
        (forward-char))
      ((and
          (save-excursion (< 0 (skip-chars-forward " \t")))
          (not (region-active-p)))
        (skip-chars-forward " \t"))
      ((and
          (save-excursion (< 0 (skip-chars-forward " \t")))
          (region-active-p))
        (skip-chars-forward " \t")
        (cond
          ((save-excursion (< 0 (skip-syntax-forward "w")))
            (skip-syntax-forward "w"))
          ((save-excursion (< 0 (skip-syntax-forward ".")))
            (skip-syntax-forward "."))
          ((save-excursion (< 0 (skip-syntax-forward "_()")))
            (skip-syntax-forward "_()"))))
      ((save-excursion (< 0 (skip-syntax-forward "w")))
        (skip-syntax-forward "w")
        (if (and
              (not (region-active-p))
              (save-excursion (< 0 (skip-chars-forward " \t"))))
          (skip-chars-forward " \t")))
      ((save-excursion (< 0 (skip-syntax-forward ".")))
        (skip-syntax-forward ".")
        (if (and
              (not (region-active-p))
              (save-excursion (< 0 (skip-chars-forward " \t"))))
          (skip-chars-forward " \t")))
      ((save-excursion (< 0 (skip-syntax-forward "_()")))
        (skip-syntax-forward "_()")
        (if (and
              (not (region-active-p))
              (save-excursion (< 0 (skip-chars-forward " \t"))))
          (skip-chars-forward " \t"))))))

(defun lawlist-backward-entity ()
"http://stackoverflow.com/q/18675201/2112489"
(interactive "^")
  (with-syntax-table lawlist-movement-syntax-table
    (cond
      ((bolp)
        (backward-char))
      ((save-excursion (> 0 (skip-chars-backward " \t")) (bolp))
        (skip-chars-backward " \t"))
      ((save-excursion (> 0 (skip-chars-backward " \t")) (> 0 (skip-syntax-backward "w")))
        (skip-chars-backward " \t")
        (skip-syntax-backward "w"))
      ((save-excursion (> 0 (skip-syntax-backward "w")))
        (skip-syntax-backward "w"))
      ((save-excursion (> 0 (skip-syntax-backward ".")))
        (skip-syntax-backward "."))
      ((save-excursion (> 0 (skip-chars-backward " \t")) (> 0 (skip-syntax-backward ".")))
        (skip-chars-backward " \t")
        (skip-syntax-backward "."))
      ((save-excursion (> 0 (skip-syntax-backward "_()")))
        (skip-syntax-backward "_()"))
      ((save-excursion (> 0 (skip-chars-backward " \t")) (> 0 (skip-syntax-backward "_()")))
        (skip-chars-backward " \t")
        (skip-syntax-backward "_()")))))

Answer 1

添加到模式的模式 Hook ，您正在编辑文本的位置:

(modify-syntax-entry ?* "w")

阅读 here了解更多信息。

请注意，这将使其他函数将星号视为单词组成部分(不过，您可能会想要它，因为您很快就会发现不仅运动命令的行为与您希望的方式相反)。

仅重载这些特定命令的另一种方法是使用 defadvice 通知它们。并在函数运行期间临时更改语法表。