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								;;; parsebib.el --- A library for parsing bib files  -*- lexical-binding: t -*-


								;; Copyright (c) 2014-2017 Joost Kremers

								;; All rights reserved.


								;; Author: Joost Kremers <joostkremers@fastmail.fm>

								;; Maintainer: Joost Kremers <joostkremers@fastmail.fm>

								;; Created: 2014

								;; Version: 2.3

								;; Package-Version: 20181219.928

								;; Keywords: text bibtex

								;; Package-Requires: ((emacs "24.3"))


								;; Redistribution and use in source and binary forms, with or without

								;; modification, are permitted provided that the following conditions

								;; are met:

								;;

								;; 1. Redistributions of source code must retain the above copyright

								;;    notice, this list of conditions and the following disclaimer.

								;; 2. 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.

								;; 3. The name of the author may not be used to endorse or promote products

								;;    derived from this software without specific prior written permission.

								;;

								;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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.


								;;; Commentary:


								;;


								;;; Code:


								(require 'bibtex)

								(require 'cl-lib)

								(eval-when-compile (require 'subr-x)) ; for `string-join'.


								(defvar parsebib--biblatex-inheritances '(("all"

								                                   "all"

								                                   (("ids" . none)

								                                    ("crossref" . none)

								                                    ("xref" . none)

								                                    ("entryset" . none)

								                                    ("entrysubtype" . none)

								                                    ("execute" . none)

								                                    ("label" . none)

								                                    ("options" . none)

								                                    ("presort" . none)

								                                    ("related" . none)

								                                    ("relatedoptions" . none)

								                                    ("relatedstring" . none)

								                                    ("relatedtype" . none)

								                                    ("shorthand" . none)

								                                    ("shorthandintro" . none)

								                                    ("sortkey" . none)))


								                                  ("mvbook, book"

								                                   "inbook, bookinbook, suppbook"

								                                   (("author" . "author")

								                                    ("author" . "bookauthor")))


								                                  ("mvbook"

								                                   "book, inbook, bookinbook, suppbook"

								                                   (("title" . "maintitle")

								                                    ("subtitle" . "mainsubtitle")

								                                    ("titleaddon" . "maintitleaddon")

								                                    ("shorttitle" . none)

								                                    ("sorttitle" . none)

								                                    ("indextitle" . none)

								                                    ("indexsorttitle" . none)))


								                                  ("mvcollection, mvreference"

								                                   "collection, reference, incollection, inreference, suppcollection"

								                                   (("title" . "maintitle")

								                                    ("subtitle" . "mainsubtitle")

								                                    ("titleaddon" . "maintitleaddon")

								                                    ("shorttitle" . none)

								                                    ("sorttitle" . none)

								                                    ("indextitle" . none)

								                                    ("indexsorttitle" . none)))


								                                  ("mvproceedings"

								                                   "proceedings, inproceedings"

								                                   (("title" . "maintitle")

								                                    ("subtitle" . "mainsubtitle")

								                                    ("titleaddon" . "maintitleaddon")

								                                    ("shorttitle" . none)

								                                    ("sorttitle" . none)

								                                    ("indextitle" . none)

								                                    ("indexsorttitle" . none)))


								                                  ("book"

								                                   "inbook, bookinbook, suppbook"

								                                   (("title" . "booktitle")

								                                    ("subtitle" . "booksubtitle")

								                                    ("titleaddon" . "booktitleaddon")

								                                    ("shorttitle" . none)

								                                    ("sorttitle" . none)

								                                    ("indextitle" . none)

								                                    ("indexsorttitle" . none)))


								                                  ("collection, reference"

								                                   "incollection, inreference, suppcollection"

								                                   (("title" . "booktitle")

								                                    ("subtitle" . "booksubtitle")

								                                    ("titleaddon" . "booktitleaddon")

								                                    ("shorttitle" . none)

								                                    ("sorttitle" . none)

								                                    ("indextitle" . none)

								                                    ("indexsorttitle" . none)))


								                                  ("proceedings"

								                                   "inproceedings"

								                                   (("title" . "booktitle")

								                                    ("subtitle" . "booksubtitle")

								                                    ("titleaddon" . "booktitleaddon")

								                                    ("shorttitle" . none)

								                                    ("sorttitle" . none)

								                                    ("indextitle" . none)

								                                    ("indexsorttitle" . none)))


								                                  ("periodical"

								                                   "article, suppperiodical"

								                                   (("title" . "journaltitle")

								                                    ("subtitle" . "journalsubtitle")

								                                    ("shorttitle" . none)

								                                    ("sorttitle" . none)

								                                    ("indextitle" . none)

								                                    ("indexsorttitle" . none))))

								  "Inheritance scheme for BibLaTeX cross-referencing.

								Inheritances are specified for pairs of source and target entry

								type, where the target is the cross-referencing entry and the

								source the cross-referenced entry.  Each pair specifies the

								fields in the source and the fields in the target that they

								correspond with.


								Inheritances valid for all entry types are defined by specifying

								the entry type as \"all\".  The entry type may also be a

								comma-separated list of entry types.


								If no inheritance rule is set up for a given entry type+field

								combination, the field inherits from the same-name field in the

								cross-referenced entry.  If no inheritance should take place, the

								target field is set to the symbol `none'.")


								;; Regexes describing BibTeX identifiers and keys.  Note that while $ ^ & are

								;; valid in BibTeX keys, they may nonetheless be problematic, because they are

								;; special for TeX.  The difference between `parsebib--bibtex-identifier' and

								;; `parsebib--key-regexp' are the parentheses (), which are valid in keys.  It may in

								;; fact not be necessary (or desirable) to distinguish the two, but until

								;; someone complains, I'll keep it this way.

								(defconst parsebib--bibtex-identifier "[^\"@\\#%',={}() \t\n\f]+" "Regexp describing a licit BibTeX identifier.")

								(defconst parsebib--key-regexp        "[^\"@\\#%',={} \t\n\f]+" "Regexp describing a licit key.")

								(defconst parsebib--entry-start "^[ \t]*@" "Regexp describing the start of an entry.")


								;; Emacs 24.3 compatibility code.

								(unless (fboundp 'define-error)

								  ;; This definition is simply copied from the Emacs 24.4 sources

								  (defun define-error (name message &optional parent)

								    "Define NAME as a new error signal.

								MESSAGE is a string that will be output to the echo area if such an error

								is signaled without being caught by a `condition-case'.

								PARENT is either a signal or a list of signals from which it inherits.

								Defaults to `error'."

								    (unless parent (setq parent 'error))

								    (let ((conditions

								           (if (consp parent)

								               (apply #'nconc

								                      (mapcar (lambda (parent)

								                                (cons parent

								                                      (or (get parent 'error-conditions)

								                                          (error "Unknown signal `%s'" parent))))

								                              parent))

								             (cons parent (get parent 'error-conditions)))))

								      (put name 'error-conditions

								           (delete-dups (copy-sequence (cons name conditions))))

								      (when message (put name 'error-message message)))))


								(define-error 'parsebib-entry-type-error "Illegal entry type" 'error)


								;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

								;; matching and parsing stuff ;;

								;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


								(defun parsebib--looking-at-goto-end (str &optional match)

								  "Like `looking-at' but move point to the end of the matching string STR.

								MATCH acts just like the argument to MATCH-END, and defaults to

								0. Comparison is done case-insensitively."

								  (or match (setq match 0))

								  (let ((case-fold-search t))

								    (if (looking-at str)

								        (goto-char (match-end match)))))


								(defun parsebib--match-paren-forward ()

								  "Move forward to the closing paren matching the opening paren at point.

								This function handles parentheses () and braces {}.  Return t if

								a matching parenthesis was found.  This function puts point

								immediately after the matching parenthesis."

								  (cond

								   ((eq (char-after) ?\{)

								    (parsebib--match-brace-forward))

								   ((eq (char-after) ?\()

								    (bibtex-end-of-entry))))


								(defun parsebib--match-delim-forward ()

								  "Move forward to the closing delimiter matching the delimiter at point.

								This function handles braces {} and double quotes \"\". Return t

								if a matching delimiter was found."

								  (let ((result (cond

								                 ((eq (char-after) ?\{)

								                  (parsebib--match-brace-forward))

								                 ((eq (char-after) ?\")

								                  (parsebib--match-quote-forward)))))

								    result))


								(defun parsebib--match-brace-forward ()

								  "Move forward to the closing brace matching the opening brace at point."

								  (with-syntax-table bibtex-braced-string-syntax-table

								    (forward-sexp 1)

								    ;; if forward-sexp does not result in an error, we want to return t

								    t))


								(defun parsebib--match-quote-forward ()

								  "Move to the closing double quote matching the quote at point."

								  (with-syntax-table bibtex-quoted-string-syntax-table

								    (forward-sexp 1)

								    ;; if forward-sexp does not result in an error, we want to return t

								    t))


								(defun parsebib--parse-value (limit &optional strings)

								  "Parse value at point.

								A value is either a field value or a @String expansion.  Return

								the value as a string.  No parsing is done beyond LIMIT, but note

								that parsing may stop well before LIMIT.


								STRINGS, if non-nil, is a hash table of @String definitions.

								@String abbrevs in the value to be parsed are then replaced with

								their expansions.  Additionally, newlines in field values are

								removed, white space is reduced to a single space and braces or

								double quotes around field values are removed."

								  (let (res)

								    (while (and (< (point) limit)

								                (not (looking-at-p ",")))

								      (cond

								       ((looking-at-p "[{\"]")

								        (let ((beg (point)))

								          (parsebib--match-delim-forward)

								          (push (buffer-substring-no-properties beg (point)) res)))

								       ((looking-at parsebib--bibtex-identifier)

								        (push (buffer-substring-no-properties (point) (match-end 0)) res)

								        (goto-char (match-end 0)))

								       ((looking-at "[[:space:]]*#[[:space:]]*")

								        (goto-char (match-end 0)))

								       (t (forward-char 1)))) ; so as not to get stuck in an infinite loop.

								    (if strings

								        (string-join (parsebib--expand-strings (nreverse res) strings))

								      (string-join (nreverse res) " # "))))


								;;;;;;;;;;;;;;;;;;;;;

								;; expanding stuff ;;

								;;;;;;;;;;;;;;;;;;;;;


								(defun parsebib--expand-strings (strings abbrevs)

								  "Expand strings in STRINGS using expansions in ABBREVS.

								STRINGS is a list of strings.  If a string in STRINGS has an

								expansion in hash table ABBREVS, replace it with its expansion.

								Otherwise, if the string is enclosed in braces {} or double

								quotes \"\", remove the delimiters.  In addition, newlines and

								multiple spaces in the string are replaced with a single space."

								  (mapcar (lambda (str)

								            (setq str (replace-regexp-in-string "[ \t\n\f]+" " " str))

								            (cond

								             ((gethash str abbrevs))

								             ((string-match "\\`[\"{]\\(.*?\\)[\"}]\\'" str)

								              (match-string 1 str))

								             (t str)))

								          strings))


								(defun parsebib-expand-xrefs (entries inheritance)

								  "Expand cross-referencing items in ENTRIES.

								BibTeX entries in ENTRIES that have a `crossref' field are

								expanded with the fields in the cross-referenced entry.  ENTRIES

								is a hash table with entries.  This hash table is updated with

								the new fields.  The return value of this function is always nil.


								INHERITANCE indicates the inheritance schema.  It can be a symbol

								`BibTeX' or `biblatex', or it can be an explicit inheritance

								schema.  See the variable `parsebib--biblatex-inheritances' for

								details on the structure of such an inheritance schema."

								  (maphash (lambda (key fields)

								             (let ((xref (cdr (assoc-string "crossref" fields))))

								               (when xref

								                 (if (string-match-p (concat "\\b[\"{]" parsebib--key-regexp "[\"}]\\b") xref)

								                     (setq xref (substring xref 1 -1)))

								                 (let* ((source (gethash xref entries))

								                        (updated-entry (parsebib--get-xref-fields fields source inheritance)))

								                   (when updated-entry

								                     (puthash key updated-entry entries))))))

								           entries))


								(defun parsebib--get-xref-fields (target-entry source-entry inheritance)

								  "Return TARGET-ENTRY supplemented with fields inherited from SOURCE-ENTRY.

								TARGET-ENTRY and SOURCE-ENTRY are entry alists.  Fields in

								SOURCE-ENTRY for which TARGET-ENTRY has no value are added to

								TARGET-ENTRY.  Return value is the modified TARGET-ENTRY.


								INHERITANCE is an inheritance schema.  It can either be one of

								the symbols `BibTeX' or `biblatex', or it can be an explicit

								inheritance schema.  See the variable

								`parsebib--biblatex-inheritances' for details on the structure of

								such an inheritance schema."

								  (when (and target-entry source-entry)

								    (when (eq inheritance 'biblatex)

								      (setq inheritance parsebib--biblatex-inheritances))

								    (let* ((inheritable-fields (unless (eq inheritance 'BibTeX)

								                                 (append (cl-third (cl-find-if (lambda (elem)

								                                                                 (and (string-match-p (concat "\\b" (cdr (assoc-string "=type=" source-entry)) "\\b") (cl-first elem))

								                                                                      (string-match-p (concat "\\b" (cdr (assoc-string "=type=" target-entry)) "\\b") (cl-second elem))))

								                                                               inheritance))

								                                         (cl-third (assoc-string "all" inheritance)))))

								           (new-fields (delq nil (mapcar (lambda (field)

								                                           (let ((target-field (parsebib--get-target-field (car field) inheritable-fields)))

								                                             (if (and target-field

								                                                      (not (assoc-string target-field target-entry 'case-fold)))

								                                                 (cons target-field (cdr field)))))

								                                         source-entry))))

								      (append target-entry new-fields))))


								(defun parsebib--get-target-field (source-field inheritances)

								  "Return the target field for inheritance from SOURCE-FIELD.

								Inheritance is determined by INHERITANCES, which is an alist of

								source/target pairs.  If no inheritance should take place for

								SOURCE-FIELD, the target in the relevant item in INHERITANCES is

								the symbol `none'.  If there is no item for SOURCE-FIELD in

								INHERITANCES, SOURCE-FIELD is returned.  Note that it is valid

								for INHERITANCES to be nil."

								  ;; Note: the argument INHERITANCES differs from the INHERITANCE argument in

								  ;; the previous two functions.  It is a simple alist of (source-field

								  ;; . target-field) pairs.

								  (let ((target-field (cdr (assoc-string source-field inheritances 'case-fold))))

								    (cond

								     ((null target-field)

								      source-field)

								     ((eq target-field 'none)

								      nil)

								     (t target-field))))


								;;;;;;;;;;;;;;;;;;;

								;; low-level API ;;

								;;;;;;;;;;;;;;;;;;;


								(defun parsebib-find-next-item (&optional pos)

								  "Find the first (potential) BibTeX item following POS.

								This function simply searches for an @ at the start of a line,

								possibly preceded by spaces or tabs, followed by a string of

								characters as defined by `parsebib--bibtex-identifier'.  When

								successful, point is placed right after the item's type, i.e.,

								generally on the opening brace or parenthesis following the entry

								type, \"@Comment\", \"@Preamble\" or \"@String\".


								The return value is the name of the item as a string, either

								\"Comment\", \"Preamble\" or \"String\", or the entry

								type (without the @). If an item name is found that includes an

								illegal character, an error of type `parsebib-entry-type-error'

								is raised. If no item is found, nil is returned and point is left

								at the end of the buffer.


								POS can be a number or a marker and defaults to point."

								  (when pos (goto-char pos))

								  (when (re-search-forward parsebib--entry-start nil 0)

								    (if (parsebib--looking-at-goto-end (concat "\\(" parsebib--bibtex-identifier "\\)" "[[:space:]]*[\(\{]?") 1)

								        (match-string-no-properties 1)

								      (signal 'parsebib-entry-type-error (list (point))))))


								(defun parsebib-read-comment (&optional pos)

								  "Read the @Comment beginning at the line POS is on.

								Return value is the text of the @Comment including the braces.

								For comments that last until the end of the line (i.e., comments

								that are not delimited by braces), the return value includes the

								whitespace between `@comment' and the actual comment text.


								If no comment could be found, return nil.


								POS can be a number or a marker.  It does not have to be at the

								beginning of a line, but the @Comment entry must start at the

								beginning of the line POS is on.  If POS is nil, it defaults to

								point."

								  (when pos (goto-char pos))

								  (beginning-of-line)

								  (when (parsebib--looking-at-goto-end (concat parsebib--entry-start "\\(comment\\)[[:space:]]*[\(\{]?") 1)

								    (let ((beg (point)))

								      (if (looking-at-p "[[:space:]]*[\(\{]")

								          (progn (skip-chars-forward "[:space:]")

								                 (parsebib--match-paren-forward))

								        (goto-char (point-at-eol)))

								      (buffer-substring-no-properties beg (point)))))


								(defun parsebib-read-string (&optional pos strings)

								  "Read the @String definition beginning at the line POS is on.

								If a proper abbreviation and expansion are found, they are

								returned as a cons cell (<abbrev> . <expansion>).  Otherwise, nil

								is returned.


								POS can be a number or a marker.  It does not have to be at the

								beginning of a line, but the @String entry must start at the

								beginning of the line POS is on.  If POS is nil, it defaults to

								point.


								If STRINGS is provided it should be a hash table with string

								abbreviations, which are used to expand abbrevs in the string's

								expansion."

								  (interactive)

								  (when pos (goto-char pos))

								  (beginning-of-line)

								  (when (parsebib--looking-at-goto-end (concat parsebib--entry-start "\\(string[[:space:]]*\\)[\(\{]") 1)

								    (let ((limit (save-excursion

								                   (parsebib--match-paren-forward)

								                   (point))))

								      (parsebib--looking-at-goto-end (concat "[({]\\(" parsebib--bibtex-identifier "\\)[[:space:]]*=[[:space:]]*"))

								      (let ((abbr (match-string-no-properties 1)))

								        (when (and abbr (> (length abbr) 0))            ; if we found an abbrev

								          (let ((expansion (parsebib--parse-value limit strings)))

								            (goto-char limit)

								            (cons abbr expansion)))))))


								(defun parsebib-read-preamble (&optional pos)

								  "Read the @Preamble definition at the line POS is on.

								Return the preamble as a string (including the braces surrounding

								the preamble text), or nil if no preamble was found.


								POS can be a number or a marker.  It does not have to be at the

								beginning of a line, but the @Preamble must start at the

								beginning of the line POS is on.  If POS is nil, it defaults to

								point."

								  (when pos (goto-char pos))

								  (beginning-of-line)

								  (when (parsebib--looking-at-goto-end (concat parsebib--entry-start "\\(preamble[[:space:]]*\\)[\(\{]") 1)

								    (let ((beg (point)))

								      (when (parsebib--match-paren-forward)

								        (buffer-substring-no-properties beg (point))))))


								(defun parsebib-read-entry (type &optional pos strings)

								  "Read a BibTeX entry of type TYPE at the line POS is on.

								TYPE should be a string and should not contain the @

								sign.  The return value is the entry as an alist of (<field> .

								<contents>) cons pairs, or nil if no entry was found.  In this

								alist, the entry key is provided in the field \"=key=\" and the

								entry type in the field \"=type=\".


								POS can be a number or a marker.  It does not have to be at the

								beginning of a line, but the entry must start at the beginning of

								the line POS is on.  If POS is nil, it defaults to point.


								ENTRY should not be \"Comment\", \"Preamble\" or \"String\", but

								is otherwise not limited to any set of possible entry types. If

								so required, the calling function has to ensure that the entry

								type is valid.


								If STRINGS is provided, it should be a hash table with string

								abbreviations, which are used to expand abbrevs in the entry's

								fields."

								  (unless (member-ignore-case type '("comment" "preamble" "string"))

								    (when pos (goto-char pos))

								    (beginning-of-line)

								    (when (parsebib--looking-at-goto-end (concat parsebib--entry-start type "[[:space:]]*[\(\{]"))

								      ;; find the end of the entry and the beginning of the entry key

								      (let* ((limit (save-excursion

								                      (backward-char)

								                      (parsebib--match-paren-forward)

								                      (point)))

								             (beg (progn

								                    (skip-chars-forward " \n\t\f") ; note the space!

								                    (point)))

								             (key (when (parsebib--looking-at-goto-end (concat "\\(" parsebib--key-regexp "\\)[ \t\n\f]*,") 1)

								                    (buffer-substring-no-properties beg (point)))))

								        (or key (setq key "")) ; if no key was found, we pretend it's empty and try to read the entry anyway

								        (skip-chars-forward "^," limit) ; move to the comma after the entry key

								        (let ((fields (cl-loop for field = (parsebib--find-bibtex-field limit strings)

								                               while field collect field)))

								          (push (cons "=type=" type) fields)

								          (push (cons "=key=" key) fields)

								          (nreverse fields))))))


								(defun parsebib--find-bibtex-field (limit &optional strings)

								  "Find the field after point.

								Do not search beyond LIMIT (a buffer position).  Return a

								cons (FIELD . VALUE), or nil if no field was found.


								If STRINGS is provided it should be a hash table with string

								abbreviations, which are used to expand abbrevs in the field's

								value."

								  (skip-chars-forward "\"#%'(),={} \n\t\f" limit) ; move to the first char of the field name

								  (unless (>= (point) limit)                      ; if we haven't reached the end of the entry

								    (let ((beg (point)))

								      (if (parsebib--looking-at-goto-end (concat "\\(" parsebib--bibtex-identifier "\\)[[:space:]]*=[[:space:]]*") 1)

								          (let ((field-type (buffer-substring-no-properties beg (point))))

								            (let ((field-contents (parsebib--parse-value limit strings)))

								              (cons field-type field-contents)))))))


								;;;;;;;;;;;;;;;;;;;;

								;; high-level API ;;

								;;;;;;;;;;;;;;;;;;;;


								(defun parsebib-collect-preambles ()

								  "Collect all @Preamble definitions in the current buffer.

								Return a list of strings, each string a separate @Preamble."

								  (save-excursion

								    (goto-char (point-min))

								    (let (res)

								      (cl-loop for item = (parsebib-find-next-item)

								               while item do

								               (when (cl-equalp item "preamble")

								                 (push (parsebib-read-preamble) res)))

								      (nreverse res))))


								(defun parsebib-collect-comments ()

								  "Collect all @Comment definitions in the current buffer.

								Return a list of strings, each string a separate @Comment."

								  (save-excursion

								    (goto-char (point-min))

								    (let (res)

								      (cl-loop for item = (parsebib-find-next-item)

								               while item do

								               (when (cl-equalp item "comment")

								                 (push (parsebib-read-comment) res)))

								      (nreverse (delq nil res)))))


								(defun parsebib-collect-strings (&optional hash expand-strings)

								  "Collect all @String definitions in the current buffer.

								Return value is a hash with the abbreviations as keys and the

								expansions as values.  If HASH is a hash table with test function

								`equal', it is used to store the @String definitions.  If

								EXPAND-STRINGS is non-nil, @String expansions are expanded

								themselves using the @String definitions already stored in HASH."

								  (or (and (hash-table-p hash)

								           (eq 'equal (hash-table-test hash)))

								      (setq hash (make-hash-table :test #'equal)))

								  (save-excursion

								    (goto-char (point-min))

								    (cl-loop with string = nil

								             for item = (parsebib-find-next-item)

								             while item do

								             (when (cl-equalp item "string")

								               (setq string (parsebib-read-string nil (if expand-strings hash)))

								               (puthash (car string) (cdr string) hash)))

								    hash))


								(defun parsebib-collect-entries (&optional hash strings inheritance)

								  "Collect all entries in the current buffer.

								Return value is a hash table containing the entries.  If HASH is

								a hash table, with test function `equal', it is used to store the

								entries.  If STRINGS is non-nil, it should be a hash table of

								string definitions, which are used to expand abbreviations used

								in the entries.


								If INHERITANCE is non-nil, cross-references in the entries are

								resolved: if the crossref field of an entry points to an entry

								already in HASH, the fields of the latter that do not occur in

								the entry are added to it.  INHERITANCE indicates the inheritance

								schema used for determining which fields inherit from which

								fields.  It can be a symbol `BibTeX' or `biblatex', or it can be

								an explicit inheritance schema.  (See the variable

								`parsebib--biblatex-inheritances' for details on the structure of

								such an inheritance schema.)  It can also be the symbol t, in

								which case the local variable block is checked for a

								dialect (using the variable `bibtex-dialect'), or, if no such

								local variable is found, the value of the variable

								`bibtex-dialect'."

								  (or (and (hash-table-p hash)

								           (eq 'equal (hash-table-test hash)))

								      (setq hash (make-hash-table :test #'equal)))

								  (if (eq inheritance t)

								      (setq inheritance (or (parsebib-find-bibtex-dialect)

								                            bibtex-dialect

								                            'BibTeX)))

								  (save-excursion

								    (goto-char (point-min))

								    (cl-loop with entry = nil

								             for entry-type = (parsebib-find-next-item)

								             while entry-type do

								             (unless (member-ignore-case entry-type '("preamble" "string" "comment"))

								               (setq entry (parsebib-read-entry entry-type nil strings))

								               (if entry

								                   (puthash (cdr (assoc-string "=key=" entry)) entry hash))))

								    (when inheritance

								      (parsebib-expand-xrefs hash inheritance))

								    hash))


								(defun parsebib-find-bibtex-dialect ()

								  "Find the BibTeX dialect of a file if one is set.

								This function looks for a local value of the variable

								`bibtex-dialect' in the local variable block at the end of the

								file.  Return nil if no dialect is found."

								  (save-excursion

								    (goto-char (point-max))

								    (let ((case-fold-search t))

								      (when (re-search-backward (concat parsebib--entry-start "comment") (- (point-max) 3000) t)

								        (let ((comment (parsebib-read-comment)))

								          (when (and comment

								                     (string-match-p "\\`{[ \n\t\r]*Local Variables:" comment)

								                     (string-match-p "End:[ \n\t\r]*}\\'" comment)

								                     (string-match (concat "bibtex-dialect: " (regexp-opt (mapcar #'symbol-name bibtex-dialect-list) t)) comment))

								            (intern (match-string 1 comment))))))))


								(defun parsebib-parse-buffer (&optional entries strings expand-strings inheritance)

								  "Parse the current buffer and return all BibTeX data.

								Return list of five elements: a hash table with the entries, a

								hash table with the @String definitions, a list of @Preamble

								definitions, a list of @Comments and the BibTeX dialect, if

								present in the file.


								If ENTRIES is a hash table with test function `equal', it is used

								to store the entries.  Any existing entries with identical keys

								are overwritten.  Similarly, if STRINGS is a hash table with test

								function `equal', the @String definitions are stored in it.


								If EXPAND-STRINGS is non-nil, abbreviations in the entries and

								@String definitions are expanded using the @String definitions

								already in STRINGS.


								If INHERITANCE is non-nil, cross-references in the entries are

								resolved: if the crossref field of an entry points to an entry

								already in ENTRIES, the fields of the latter that do not occur in

								the entry are added to it.  INHERITANCE indicates the inheritance

								schema used for determining which fields inherit from which

								fields.  It can be a symbol `BibTeX' or `biblatex', which means

								to use the default inheritance schema for either dialect, or it

								can be an explicit inheritance schema.  (See the variable

								`parsebib--biblatex-inheritances' for details on the structure of

								such an inheritance schema.)  It can also be the symbol t, in

								which case the local variable block is checked for a

								dialect (using the variable `bibtex-dialect'), or, if no such

								local variable is found, the value of the variable

								`bibtex-dialect'."

								  (save-excursion

								    (goto-char (point-min))

								    (or (and (hash-table-p entries)

								             (eq (hash-table-test entries) 'equal))

								        (setq entries (make-hash-table :test #'equal)))

								    (or (and (hash-table-p strings)

								             (eq (hash-table-test strings) 'equal))

								        (setq strings (make-hash-table :test #'equal)))

								    (let ((dialect (or (parsebib-find-bibtex-dialect)

								                       bibtex-dialect

								                       'BibTeX))

								          preambles comments)

								      (cl-loop for item = (parsebib-find-next-item)

								               while item do

								               (cond

								                ((cl-equalp item "string") ; `cl-equalp' compares strings case-insensitively.

								                 (let ((string (parsebib-read-string nil (if expand-strings strings))))

								                   (if string

								                       (puthash (car string) (cdr string) strings))))

								                ((cl-equalp item "preamble")

								                 (push (parsebib-read-preamble) preambles))

								                ((cl-equalp item "comment")

								                 (push (parsebib-read-comment) comments))

								                ((stringp item)

								                 (let ((entry (parsebib-read-entry item nil (if expand-strings strings))))

								                   (when entry

								                     (puthash (cdr (assoc-string "=key=" entry)) entry entries))))))

								      (when inheritance (parsebib-expand-xrefs entries (if (eq inheritance t) dialect inheritance)))

								      (list entries strings (nreverse preambles) (nreverse comments) dialect))))


								(provide 'parsebib)


								;;; parsebib.el ends here