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+;;; ledger-regex.el --- Helper code for use with the "ledger" command-line tool  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2003-2016 John Wiegley (johnw AT gnu DOT org)
+
+;; This file is not part of GNU Emacs.
+
+;; This is free software; you can redistribute it and/or modify it under
+;; the terms of the GNU General Public License as published by the Free
+;; Software Foundation; either version 2, or (at your option) any later
+;; version.
+;;
+;; This is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+;; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+;; for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+;; MA 02110-1301 USA.
+
+
+;;; Commentary:
+;; Regular expressions used by ledger-mode.
+
+;;; Code:
+
+(require 'rx)
+(require 'cl-lib)
+
+(defvar ledger-iso-date-regex)
+
+(defconst ledger-amount-decimal-comma-regex
+  "-?[1-9][0-9.]*[,]?[0-9]*")
+
+(defconst ledger-amount-decimal-period-regex
+  "-?[1-9][0-9,]*[.]?[0-9]*")
+
+(defconst ledger-other-entries-regex
+  "\\(^[~=A-Za-z].+\\)+")
+
+(defconst ledger-comment-regex
+  "^[;#|\\*%].*\\|[ \t]+;.*")
+
+(defconst ledger-multiline-comment-start-regex
+  "^!comment$")
+(defconst ledger-multiline-comment-end-regex
+  "^!end_comment$")
+(defconst ledger-multiline-comment-regex
+  "^!comment\n\\(.*\n\\)*?!end_comment$")
+
+(defconst ledger-payee-any-status-regex
+  "^[0-9]+[-/][-/.=0-9]+\\(\\s-+\\*\\)?\\(\\s-+(.*?)\\)?\\s-+\\(.+?\\)\\s-*\\(;\\|$\\)")
+
+(defconst ledger-payee-pending-regex
+  "^[0-9]+[-/][-/.=0-9]+\\s-!\\s-+\\(([^)]+)\\s-+\\)?\\([^*].+?\\)\\s-*\\(;\\|$\\)")
+
+(defconst ledger-payee-cleared-regex
+  "^[0-9]+[-/][-/.=0-9]+\\s-\\*\\s-+\\(([^)]+)\\s-+\\)?\\([^*].+?\\)\\s-*\\(;\\|$\\)")
+
+(defconst ledger-payee-uncleared-regex
+  "^[0-9]+[-/][-/.=0-9]+\\s-+\\(([^)]+)\\s-+\\)?\\([^*].+?\\)\\s-*\\(;\\|$\\)")
+
+(defconst ledger-init-string-regex
+  "^--.+?\\($\\|[ ]\\)")
+
+(defconst ledger-account-name-regex
+  "\\(?1:[^][(); \t\r\n]+\\(?: [^][(); \t\r\n]+\\)*\\)")
+
+(defconst ledger-account-directive-regex
+  (concat "^account[ \t]+" ledger-account-name-regex))
+
+(defconst ledger-account-name-maybe-virtual-regex
+  (concat "[[(]?" ledger-account-name-regex "[])]?"))
+
+(defconst ledger-account-any-status-regex
+  (concat "^[ \t]+\\(?:[!*][ \t]*\\)?" ledger-account-name-maybe-virtual-regex))
+
+;; This would incorrectly match "account (foo)", but writing the regexp this way
+;; allows us to have just one match result
+(defconst ledger-account-name-or-directive-regex
+  (format "\\(?:%s\\|%s\\)" ledger-account-any-status-regex ledger-account-directive-regex))
+
+(defconst ledger-account-pending-regex
+  (concat "\\(^[ \t]+\\)!" ledger-account-name-maybe-virtual-regex))
+
+(defconst ledger-account-cleared-regex
+  (concat "\\(^[ \t]+\\)*" ledger-account-name-maybe-virtual-regex))
+
+(defmacro ledger-define-regexp (name regex docs &rest args)
+  "Simplify the creation of a Ledger regex and helper functions."
+  (let ((defs
+          (list
+           `(defconst
+              ,(intern (concat "ledger-" (symbol-name name) "-regexp"))
+              ,(eval regex)
+              ,docs)))
+        (addend 0) last-group)
+    (if (null args)
+        (progn
+          (nconc
+           defs
+           (list
+            `(defconst
+               ,(intern
+                 (concat "ledger-regex-" (symbol-name name) "-group"))
+               1)))
+          (nconc
+           defs
+           (list
+            `(defconst
+               ,(intern (concat "ledger-regex-" (symbol-name name)
+                                "-group--count"))
+               1)))
+          (nconc
+           defs
+           (list
+            `(defmacro
+                 ,(intern (concat "ledger-regex-" (symbol-name name)))
+                 (&optional string)
+               ,(format "Return the match string for the %s" name)
+               (match-string
+                ,(intern (concat "ledger-regex-" (symbol-name name)
+                                 "-group"))
+                string)))))
+
+      (dolist (arg args)
+        (let (var grouping target)
+          (if (symbolp arg)
+              (setq var arg target arg)
+            (cl-assert (listp arg))
+            (if (= 2 (length arg))
+                (setq var (car arg)
+                      target (cadr arg))
+              (setq var (car arg)
+                    grouping (cadr arg)
+                    target (cl-caddr arg))))
+
+          (if (and last-group
+                   (not (eq last-group (or grouping target))))
+              (cl-incf addend
+                       (symbol-value
+                        (intern-soft (concat "ledger-regex-"
+                                             (symbol-name last-group)
+                                             "-group--count")))))
+          (nconc
+           defs
+           (list
+            `(defconst
+               ,(intern (concat "ledger-regex-" (symbol-name name)
+                                "-group-" (symbol-name var)))
+               ,(+ addend
+                   (symbol-value
+                    (intern-soft
+                     (if grouping
+                         (concat "ledger-regex-" (symbol-name grouping)
+                                 "-group-" (symbol-name target))
+                       (concat "ledger-regex-" (symbol-name target)
+                               "-group"))))))))
+          (nconc
+           defs
+           (list
+            `(defmacro
+                 ,(intern (concat "ledger-regex-" (symbol-name name)
+                                  "-" (symbol-name var)))
+                 (&optional string)
+               ,(format "Return the sub-group match for the %s %s."
+                        name var)
+               (match-string
+                ,(intern (concat "ledger-regex-" (symbol-name name)
+                                 "-group-" (symbol-name var)))
+                string))))
+
+          (setq last-group (or grouping target))))
+
+      (nconc defs
+             (list
+              `(defconst ,(intern (concat "ledger-regex-" (symbol-name name)
+                                          "-group--count"))
+                 ,(length args)))))
+
+    (cons 'eval-and-compile defs)))
+
+(put 'ledger-define-regexp 'lisp-indent-function 1)
+
+(ledger-define-regexp iso-date
+                      ( let ((sep '(or ?-  ?/)))
+                        (rx (group
+                             (and (group (= 4 num))
+                                  (eval sep)
+                                  (group (and num (? num)))
+                                  (eval sep)
+                                  (group (and num (? num)))))))
+                      "Match a single date, in its 'written' form.")
+
+(ledger-define-regexp full-date
+                      (macroexpand
+                       `(rx (and (regexp ,ledger-iso-date-regexp)
+                                 (? (and ?= (regexp ,ledger-iso-date-regexp))))))
+                      "Match a compound date, of the form ACTUAL=EFFECTIVE"
+                      (actual iso-date)
+                      (effective iso-date))
+
+(ledger-define-regexp state
+                      (rx (group (any ?! ?*)))
+                      "Match a transaction or posting's \"state\" character.")
+
+(ledger-define-regexp code
+                      (rx (and ?\( (group (+? (not (any ?\))))) ?\)))
+                      "Match the transaction code.")
+
+(ledger-define-regexp long-space
+                      (rx (and (*? blank)
+                               (or (and ?  (or ?  ?\t)) ?\t)))
+                      "Match a \"long space\".")
+
+(ledger-define-regexp note
+                      (rx (group (+ nonl)))
+                      "")
+
+(ledger-define-regexp end-note
+                      (macroexpand
+                       `(rx (and (regexp ,ledger-long-space-regexp) ?\;
+                                 (regexp ,ledger-note-regexp))))
+                      "")
+
+(ledger-define-regexp full-note
+                      (macroexpand
+                       `(rx (and line-start (+ blank)
+                                 ?\; (regexp ,ledger-note-regexp))))
+                      "")
+
+(ledger-define-regexp xact-line
+                      (macroexpand
+                       `(rx (and line-start
+                                 (regexp ,ledger-full-date-regexp)
+                                 (? (and (+ blank) (regexp ,ledger-state-regexp)))
+                                 (? (and (+ blank) (regexp ,ledger-code-regexp)))
+                                 (+ blank) (+? nonl)
+                                 (? (regexp ,ledger-end-note-regexp))
+                                 line-end)))
+                      "Match a transaction's first line (and optional notes)."
+                      (actual-date full-date actual)
+                      (effective-date full-date effective)
+                      state
+                      code
+                      (note end-note))
+
+(ledger-define-regexp recurring-line
+                      (macroexpand
+                       `(rx (and line-start
+                                 (regexp "\\[.+/.+/.+\\]")
+                                 (? (and (+ blank) (regexp ,ledger-state-regexp)))
+                                 (? (and (+ blank) (regexp ,ledger-code-regexp)))
+                                 (+ blank) (+? nonl)
+                                 (? (regexp ,ledger-end-note-regexp))
+                                 line-end)))
+                      "Match a transaction's first line (and optional notes)."
+                      (actual-date full-date actual)
+                      (effective-date full-date effective)
+                      state
+                      code
+                      (note end-note))
+
+(ledger-define-regexp account
+                      (rx (group (and (not (any blank ?\[ ?\( ?: ?\;)) (*? nonl))))
+                      "")
+
+(ledger-define-regexp account-kind
+                      (rx (group (? (any ?\[ ?\())))
+                      "")
+
+(ledger-define-regexp full-account
+                      (macroexpand
+                       `(rx (and (regexp ,ledger-account-kind-regexp)
+                                 (regexp ,ledger-account-regexp)
+                                 (? (any ?\] ?\))))))
+                      ""
+                      (kind account-kind)
+                      (name account))
+
+(ledger-define-regexp commodity-no-group
+                      (rx (or (and ?\" (+ (not (any ?\"))) ?\")
+                              (+ (not (any blank ?\n
+                                           digit
+                                           ?- ?\[ ?\]
+                                           ?. ?, ?\; ?+ ?* ?/ ?^ ?? ?: ?& ?| ?! ?=
+                                           ?\< ?\> ?\{ ?\} ?\( ?\) ?@)))))
+                      "")
+
+(ledger-define-regexp commodity
+                      (macroexpand
+                       `(rx (group (regexp ,ledger-commodity-no-group-regexp))))
+                      "")
+
+(ledger-define-regexp amount-no-group
+                      (rx (and (? ?-)
+                               (+ digit)
+                               (*? (and (any ?. ?,) (+ digit)))))
+                      "")
+
+(ledger-define-regexp amount
+                      (macroexpand
+                       `(rx (group (regexp ,ledger-amount-no-group-regexp))))
+                      "")
+
+(ledger-define-regexp commoditized-amount
+                      (macroexpand
+                       `(rx (group
+                             (or (and (regexp ,ledger-commodity-no-group-regexp)
+                                      (*? blank)
+                                      (regexp ,ledger-amount-no-group-regexp))
+                                 (and (regexp ,ledger-amount-no-group-regexp)
+                                      (*? blank)
+                                      (regexp ,ledger-commodity-no-group-regexp))))))
+                      "")
+
+(ledger-define-regexp commodity-annotations
+                      (macroexpand
+                       `(rx (* (+ blank)
+                               (or (and ?\{ (regexp ,ledger-commoditized-amount-regexp) ?\})
+                                   (and ?\[ (regexp ,ledger-iso-date-regexp) ?\])
+                                   (and ?\( (not (any ?\))) ?\))))))
+                      "")
+
+(ledger-define-regexp cost
+                      (macroexpand
+                       `(rx (and (or "@" "@@") (+ blank)
+                                 (regexp ,ledger-commoditized-amount-regexp))))
+                      "")
+
+(ledger-define-regexp balance-assertion
+                      (macroexpand
+                       `(rx (and ?= (+ blank)
+                                 (regexp ,ledger-commoditized-amount-regexp))))
+                      "")
+
+(ledger-define-regexp full-amount
+                      (macroexpand `(rx (group (+? (not (any ?\;))))))
+                      "")
+
+(ledger-define-regexp post-line
+                      (macroexpand
+                       `(rx (and line-start (+ blank)
+                                 (? (and (regexp ,ledger-state-regexp) (* blank)))
+                                 (regexp ,ledger-full-account-regexp)
+                                 (? (and (regexp ,ledger-long-space-regexp)
+                                         (regexp ,ledger-full-amount-regexp)))
+                                 (? (regexp ,ledger-end-note-regexp))
+                                 line-end)))
+                      ""
+                      state
+                      (account-kind full-account kind)
+                      (account full-account name)
+                      (amount full-amount)
+                      (note end-note))
+
+(defconst ledger-amount-regex
+  (concat "\\(  \\|\t\\| \t\\)[ \t]*-?"
+          "\\(?:" ledger-commodity-regexp " *\\)?"
+          ;; We either match just a number after the commodity with no
+          ;; decimal or thousand separators or a number with thousand
+          ;; separators.  If we have a decimal part starting with `,'
+          ;; or `.', because the match is non-greedy, it must leave at
+          ;; least one of those symbols for the following capture
+          ;; group, which then finishes the decimal part.
+          "\\(-?\\(?:[0-9]+\\|[0-9,.]+?\\)\\)"
+          "\\([,.][0-9)]+\\)?"
+          "\\(?: *" ledger-commodity-regexp "\\)?"
+          "\\([ \t]*[@={]@?[^\n;]+?\\)?"
+          "\\([ \t]+;.+?\\|[ \t]*\\)?$"))
+
+(defconst ledger-iterate-regex
+  (concat "\\(\\(?:Y\\|year\\)\\s-+\\([0-9]+\\)\\|"  ;; Catches a Y/year directive
+          ledger-iso-date-regexp
+          "\\([ *!]+\\)"  ;; mark
+          "\\((.*)\\)?"  ;; code
+          "\\([[:word:] ]+\\)"   ;; desc
+          "\\)"))
+
+(defconst ledger-incomplete-date-regexp
+  "\\(?:\\([0-9]\\{1,2\\}\\)[-/]\\)?\\([0-9]\\{1,2\\}\\)")
+
+(defconst ledger-xact-start-regex
+  (concat "^" ledger-iso-date-regexp  ;; subexp 1
+          "\\(=" ledger-iso-date-regexp "\\)?"
+          ))
+
+(defconst ledger-xact-after-date-regex
+  (concat "\\(?:[ \t]+\\([*!]\\)\\)?"  ;; mark, subexp 1
+          "\\(?:[ \t]+\\((.*?)\\)\\)?"  ;; code, subexp 2
+          "\\(?:[ \t]+\\(.+?\\)\\)?"   ;; desc, subexp 3
+          "\\(?:\\(?:\t\\|[ \t]\\{2,\\}\\)\\(;[^\n]*\\)\\)?$" ;; comment, subexp 4
+          ))
+
+(defconst ledger-posting-regex
+  (concat "^[[:blank:]]+"                 ; initial white space
+          "\\(\\([*!]\\)?"                ; state and account 1, state 2
+          "[[:blank:]]*\\(.*?\\)\\)?"     ; account 3
+          "\\(?:\t\\|[[:blank:]]\\{2,\\}" ; column separator
+          "\\([^;\n]*?\\)"                ; amount 4
+          "[[:blank:]]*\\(;.*\\)?\\)?$"   ; comment 5
+          ))
+
+
+
+(defconst ledger-directive-start-regex
+  "[=~;#%|\\*[A-Za-z]")
+
+
+(provide 'ledger-regex)
+
+;;; ledger-regex.el ends here