246 lines
12 KiB
EmacsLisp
246 lines
12 KiB
EmacsLisp
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;;; origami-parsers.el --- Collection of parsers -*- lexical-binding: t -*-
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;; Author: Greg Sexton <gregsexton@gmail.com>
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;; Version: 1.0
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;; Keywords: parsers
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;; URL: https://github.com/gregsexton/
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;; The MIT License (MIT)
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;; Copyright (c) 2014 Greg Sexton
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;; Permission is hereby granted, free of charge, to any person obtaining a copy
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;; of this software and associated documentation files (the "Software"), to deal
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;; in the Software without restriction, including without limitation the rights
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;; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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;; copies of the Software, and to permit persons to whom the Software is
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;; furnished to do so, subject to the following conditions:
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;; The above copyright notice and this permission notice shall be included in
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;; all copies or substantial portions of the Software.
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;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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;; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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;; THE SOFTWARE.
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;;; Commentary:
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;;; Code:
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(require 'cl)
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(require 'dash)
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(defun origami-get-positions (content regex)
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"Returns a list of positions where REGEX matches in CONTENT. A
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position is a cons cell of the character and the numerical
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position in the CONTENT."
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(with-temp-buffer
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(insert content)
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(goto-char (point-min))
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(let (acc)
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(while (re-search-forward regex nil t)
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(let ((match (match-string 0)))
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(setq acc (cons (cons match (- (point) (length match)))
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acc))))
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(reverse acc))))
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(defun origami-indent-parser (create)
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(cl-labels ((lines (string) (origami-get-positions string ".*?\r?\n"))
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(annotate-levels (lines)
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(-map (lambda (line)
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;; TODO: support tabs
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(let ((indent (length (car (s-match "^ *" (car line)))))
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(beg (cdr line))
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(end (+ (cdr line) (length (car line)) -1)))
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(if (s-blank? (s-trim (car line)))
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'newline ;sentinel representing line break
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(vector indent beg end (- end beg)))))
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lines))
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(indent (line) (if (eq line 'newline) -1 (aref line 0)))
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(beg (line) (aref line 1))
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(end (line) (aref line 2))
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(offset (line) (aref line 3))
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(collapse-same-level (lines)
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(->>
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(cdr lines)
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(-reduce-from (lambda (acc line)
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(cond ((and (eq line 'newline) (eq (car acc) 'newline)) acc)
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((= (indent line) (indent (car acc)))
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(cons (vector (indent (car acc))
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(beg (car acc))
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(end line)
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(offset (car acc)))
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(cdr acc)))
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(t (cons line acc))))
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(list (car lines)))
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(remove 'newline)
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reverse))
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(create-tree (levels)
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(if (null levels)
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levels
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(let ((curr-indent (indent (car levels))))
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(->> levels
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(-partition-by (lambda (l) (= (indent l) curr-indent)))
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(-partition-all 2)
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(-mapcat (lambda (x)
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;takes care of multiple identical levels, introduced when there are newlines
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(-concat
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(-map 'list (butlast (car x)))
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(list (cons (-last-item (car x)) (create-tree (cadr x)))))))))))
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(build-nodes (tree)
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(if (null tree) (cons 0 nil)
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;; complexity here is due to having to find the end of the children so that the
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;; parent encompasses them
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(-reduce-r-from (lambda (nodes acc)
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(destructuring-bind (children-end . children) (build-nodes (cdr nodes))
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(let ((this-end (max children-end (end (car nodes)))))
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(cons (max this-end (car acc))
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(cons (funcall create
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(beg (car nodes))
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this-end
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(offset (car nodes))
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children)
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(cdr acc))))))
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'(0 . nil)
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tree))))
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(lambda (content)
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(-> content
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lines
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annotate-levels
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collapse-same-level
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create-tree
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build-nodes
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cdr))))
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(defun origami-build-pair-tree (create open close positions)
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(cl-labels ((build (positions)
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;; this is so horrible, but fast
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(let (acc beg (should-continue t))
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(while (and should-continue positions)
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(cond ((equal (caar positions) open)
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(if beg ;go down a level
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(let* ((res (build positions))
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(new-pos (car res))
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(children (cdr res)))
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(setq positions (cdr new-pos))
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(setq acc (cons (funcall create beg (cdar new-pos) (length open) children)
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acc))
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(setq beg nil))
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;; begin a new pair
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(setq beg (cdar positions))
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(setq positions (cdr positions))))
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((equal (caar positions) close)
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(if beg
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(progn ;close with no children
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(setq acc (cons (funcall create beg (cdar positions) (length close) nil)
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acc))
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(setq positions (cdr positions))
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(setq beg nil))
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(setq should-continue nil)))))
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(cons positions (reverse acc)))))
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(cdr (build positions))))
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;;; TODO: tag these nodes? have ability to manipulate nodes that are
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;;; tagged? in a scoped fashion?
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(defun origami-javadoc-parser (create)
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(lambda (content)
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(let ((positions (->> (origami-get-positions content "/\\*\\*\\|\\*/")
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(-filter (lambda (position)
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(eq (get-text-property 0 'face (car position))
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'font-lock-doc-face))))))
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(origami-build-pair-tree create "/**" "*/" positions))))
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(defun origami-c-style-parser (create)
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(lambda (content)
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(let ((positions (->> (origami-get-positions content "[{}]")
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(remove-if (lambda (position)
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(let ((face (get-text-property 0 'face (car position))))
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(-any? (lambda (f)
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(memq f '(font-lock-doc-face
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font-lock-comment-face
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font-lock-string-face)))
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(if (listp face) face (list face)))))))))
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(origami-build-pair-tree create "{" "}" positions))))
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(defun origami-c-macro-parser (create)
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(lambda (content)
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(let ((positions (origami-get-positions content "#if\\|#endif")))
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(origami-build-pair-tree create "#if" "#endif" positions))))
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(defun origami-c-parser (create)
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(let ((c-style (origami-c-style-parser create))
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(macros (origami-c-macro-parser create)))
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(lambda (content)
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(origami-fold-children
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(origami-fold-shallow-merge
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(origami-fold-root-node (funcall c-style content))
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(origami-fold-root-node (funcall macros content)))))))
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(defun origami-java-parser (create)
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(let ((c-style (origami-c-style-parser create))
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(javadoc (origami-javadoc-parser create)))
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(lambda (content)
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(origami-fold-children
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(origami-fold-shallow-merge (origami-fold-root-node (funcall c-style content))
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(origami-fold-root-node (funcall javadoc content)))))))
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(defun origami-lisp-parser (create regex)
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(lambda (content)
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(with-temp-buffer
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(insert content)
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(goto-char (point-min))
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(beginning-of-defun -1)
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(let (beg end offset acc)
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(while (< (point) (point-max))
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(setq beg (point))
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(search-forward-regexp regex nil t)
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(setq offset (- (point) beg))
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(end-of-defun)
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(backward-char) ;move point to one after the last paren
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(setq end (1- (point))) ;don't include the last paren in the fold
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(when (> offset 0)
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(setq acc (cons (funcall create beg end offset nil) acc)))
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(beginning-of-defun -1))
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(reverse acc)))))
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(defun origami-elisp-parser (create)
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(origami-lisp-parser create "(def\\w*\\s-*\\(\\s_\\|\\w\\|[:?!]\\)*\\([ \\t]*(.*?)\\)?"))
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(defun origami-clj-parser (create)
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(origami-lisp-parser create "(def\\(\\w\\|-\\)*\\s-*\\(\\s_\\|\\w\\|[?!]\\)*\\([ \\t]*\\[.*?\\]\\)?"))
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(defun origami-markers-parser (start-marker end-marker)
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"Create a parser for simple start and end markers."
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(let ((regex (rx-to-string `(or ,start-marker ,end-marker))))
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(lambda (create)
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(lambda (content)
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(let ((positions (origami-get-positions content regex)))
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(origami-build-pair-tree create start-marker end-marker positions))))))
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(defcustom origami-parser-alist
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`((java-mode . origami-java-parser)
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(c-mode . origami-c-parser)
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(c++-mode . origami-c-parser)
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(perl-mode . origami-c-style-parser)
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(cperl-mode . origami-c-style-parser)
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(js-mode . origami-c-style-parser)
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(js2-mode . origami-c-style-parser)
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(js3-mode . origami-c-style-parser)
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(go-mode . origami-c-style-parser)
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(php-mode . origami-c-style-parser)
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(python-mode . origami-indent-parser)
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(emacs-lisp-mode . origami-elisp-parser)
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(lisp-interaction-mode . origami-elisp-parser)
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(clojure-mode . origami-clj-parser)
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(triple-braces . ,(origami-markers-parser "{{{" "}}}")))
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"alist mapping major-mode to parser function."
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:type 'hook
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:group 'origami)
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(provide 'origami-parsers)
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;;; origami-parsers.el ends here
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