diff options
Diffstat (limited to 'src/elisp/urweb-move.el')
| -rw-r--r-- | src/elisp/urweb-move.el | 111 |
1 files changed, 65 insertions, 46 deletions
diff --git a/src/elisp/urweb-move.el b/src/elisp/urweb-move.el index da74bcee..5e4e6824 100644 --- a/src/elisp/urweb-move.el +++ b/src/elisp/urweb-move.el @@ -182,6 +182,7 @@ This assumes that we are `looking-at' the OP." (or (/= 0 (skip-syntax-forward "'w_")) (/= 0 (skip-syntax-forward ".'")))) (defun urweb-forward-sym () + (interactive) (let ((sym (urweb-move-read (urweb-forward-sym-1)))) (cond ((equal "op" sym) @@ -206,22 +207,33 @@ This assumes that we are `looking-at' the OP." (or (/= 0 (skip-syntax-backward ".'")) (/= 0 (skip-syntax-backward "'w_")))) (defun urweb-backward-sym () + (interactive) (let ((sym (urweb-move-read (urweb-backward-sym-1)))) - (when sym - ;; FIXME: what should we do if `sym' = "op" ? - (let ((point (point))) - (urweb-backward-spaces) - (if (equal "op" (urweb-move-read (urweb-backward-sym-1))) - (concat "op " sym) - (goto-char point) - (cond - ((string= sym "=") (if (urweb-poly-equal-p) "=" "d=")) - ((string= sym "of") (if (urweb-nested-of-p) "of" "=of")) - ;; ((string= sym "datatype") - ;; (save-excursion (urweb-backward-spaces) - ;; (if (eq (preceding-char) ?=) "=datatype" sym))) - (t sym))))))) - + (let ((result + (when sym + ;; FIXME: what should we do if `sym' = "op" ? + (let ((point (point))) + (urweb-backward-spaces) + (if (equal "op" (urweb-move-read (urweb-backward-sym-1))) + (concat "op " sym) + (goto-char point) + (cond + ((string= sym "=") (if (urweb-poly-equal-p) "=" "d=")) + ((string= sym "of") (if (urweb-nested-of-p) "of" "=of")) + ;; ((string= sym "datatype") + ;; (save-excursion (urweb-backward-spaces) + ;; (if (eq (preceding-char) ?=) "=datatype" sym))) + (t sym))))))) + (if (looking-at ">") + (substring result 1 nil) + result)))) +;; (if (save-excursion (backward-char 5) (looking-at "</xml>")) +;; (progn +;; (backward-char 5) +;; (urweb-tag-matcher) +;; (backward-char) +;; (urweb-backward-sym)) +;; result)))) (defun urweb-tag-matcher () "Seek back to a matching opener tag" @@ -243,35 +255,42 @@ This assumes that we are `looking-at' the OP." "Move one sexp backward if possible, or one char else. Returns t if the move indeed moved through one sexp and nil if not. PREC is the precedence currently looked for." - (let ((parse-sexp-lookup-properties t) - (parse-sexp-ignore-comments t)) - (urweb-backward-spaces) - (let* ((op (urweb-backward-sym)) - (op-prec (urweb-op-prec op 'back)) - match) - (cond - ((not op) - (let ((point (point))) - (ignore-errors (let ((forward-sexp-function nil)) (backward-sexp 1))) - (if (/= point (point)) t (ignore-errors (backward-char 1)) nil))) - ;; stop as soon as precedence is smaller than `prec' - ((and prec op-prec (>= prec op-prec)) nil) - ;; special rules for nested constructs like if..then..else - ((and (or (not prec) (and prec op-prec)) - (setq match (second (assoc op urweb-close-paren)))) - (urweb-find-match-backward (concat "\\<" op "\\>") match)) - ;; don't back over open-parens - ((assoc op urweb-open-paren) nil) - ;; infix ops precedence - ((and prec op-prec) (< prec op-prec)) - ;; [ prec = nil ] a new operator, let's skip the sexps until the next - (op-prec (while (urweb-move-if (urweb-backward-sexp op-prec))) t) - ;; special symbols indicating we're getting out of a nesting level - ((string-match urweb-sexp-head-symbols-re op) nil) - ;; if the op was not alphanum, then we still have to do the backward-sexp - ;; this reproduces the usual backward-sexp, but it might be bogus - ;; in this case since !@$% is a perfectly fine symbol - (t t))))) ;(or (string-match "\\sw" op) (urweb-backward-sexp prec)) + (let ((result (let ((parse-sexp-lookup-properties t) + (parse-sexp-ignore-comments t)) + (urweb-backward-spaces) + (let* ((op (urweb-backward-sym)) + (op-prec (urweb-op-prec op 'back)) + match) + (cond + ((not op) + (let ((point (point))) + (ignore-errors (let ((forward-sexp-function nil)) (backward-sexp 1))) + (if (/= point (point)) t (ignore-errors (backward-char 1)) nil))) + ;; stop as soon as precedence is smaller than `prec' + ((and prec op-prec (>= prec op-prec)) nil) + ;; special rules for nested constructs like if..then..else + ((and (or (not prec) (and prec op-prec)) + (setq match (second (assoc op urweb-close-paren)))) + (urweb-find-match-backward (concat "\\<" op "\\>") match)) + ;; don't back over open-parens + ((assoc op urweb-open-paren) nil) + ;; infix ops precedence + ((and prec op-prec) (< prec op-prec)) + ;; [ prec = nil ] a new operator, let's skip the sexps until the next + (op-prec (while (urweb-move-if (urweb-backward-sexp op-prec))) t) + ;; special symbols indicating we're getting out of a nesting level + ((string-match urweb-sexp-head-symbols-re op) nil) + ;; if the op was not alphanum, then we still have to do the backward-sexp + ;; this reproduces the usual backward-sexp, but it might be bogus + ;; in this case since !@$% is a perfectly fine symbol + (t t)))))) + (if (save-excursion (backward-char 5) (looking-at "</xml>")) + (progn + (backward-char 5) + (urweb-tag-matcher) + (backward-char) + (urweb-backward-sexp prec)) + result))) (defun urweb-forward-sexp (prec) "Moves one sexp forward if possible, or one char else. @@ -340,8 +359,8 @@ Returns T if the move indeed moved through one sexp and NIL if not." ;;(defun urweb-forward-thing () ;; (if (= ?w (char-syntax (char-after))) (forward-word 1) (forward-char 1))) -(defun urweb-backward-arg () (urweb-backward-sexp 1000)) -(defun urweb-forward-arg () (urweb-forward-sexp 1000)) +(defun urweb-backward-arg () (interactive) (urweb-backward-sexp 1000)) +(defun urweb-forward-arg () (interactive) (urweb-forward-sexp 1000)) (provide 'urweb-move) |