From 05c5436ed6d584a2f2faef463ad6d71f443e3d77 Mon Sep 17 00:00:00 2001
From: Charles Lehner <cel@celehner.com>
Date: Thu, 29 Oct 2015 12:02:41 -0400
Subject: lexer: add ledger lexer

---
 lexers/ledger.lua | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lexers/lexer.lua  |  1 +
 2 files changed, 58 insertions(+)
 create mode 100644 lexers/ledger.lua

diff --git a/lexers/ledger.lua b/lexers/ledger.lua
new file mode 100644
index 0000000..3cb6485
--- /dev/null
+++ b/lexers/ledger.lua
@@ -0,0 +1,57 @@
+-- Copyright 2015 Charles Lehner. See LICENSE.
+-- ledger journal LPeg lexer.
+
+local l = require('lexer')
+local token, word_match = l.token, l.word_match
+local P, R, S = lpeg.P, lpeg.R, lpeg.S
+
+local M = {_NAME = 'ledger'}
+
+local delim = P('\t') + P('  ')
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments.
+local comment = token(l.COMMENT, S(';#') * l.nonnewline^0)
+
+-- Strings.
+local sq_str = l.delimited_range("'")
+local dq_str = l.delimited_range('"')
+local label = l.delimited_range('[]', true, true)
+local string = token(l.STRING, sq_str + dq_str + label)
+
+-- Date.
+local date = token(l.CONSTANT, l.starts_line((l.digit + S('/-')) ^1))
+
+-- Account.
+local account = token(l.VARIABLE,
+                      l.starts_line(S(' \t')^1 * (l.print - delim)^1))
+
+-- Amount.
+local amount = token(l.NUMBER, delim * (1 - S(';\r\n'))^1)
+
+-- Automated transactions.
+local auto_tx = token(l.PREPROCESSOR, l.starts_line(S('=~') * l.nonnewline^0))
+
+-- Directives.
+local directive_word = word_match{
+	'account', 'alias', 'assert', 'bucket', 'capture', 'check', 'comment',
+	'commodity', 'define', 'end', 'fixed', 'endfixed', 'include', 'payee',
+	'apply', 'tag', 'test', 'year'
+} + S('AYNDCIiOobh')
+local directive = token(l.KEYWORD, l.starts_line(S('!@')^-1 * directive_word))
+
+M._rules = {
+  {'account', account},
+  {'amount', amount},
+  {'comment', comment},
+  {'whitespace', ws},
+  {'date', date},
+  {'auto_tx', auto_tx},
+  {'directive', directive},
+}
+
+M._LEXBYLINE = true
+
+return M
diff --git a/lexers/lexer.lua b/lexers/lexer.lua
index b42dc26..2cb7ad0 100644
--- a/lexers/lexer.lua
+++ b/lexers/lexer.lua
@@ -1648,6 +1648,7 @@ local files = {
 	[".bbl|.dtx|.ins|.ltx|.tex|.sty"] = "latex",
 	[".less"] = "less",
 	[".lily|.ly"] = "lilypond",
+	[".ledger|.journal"] = "ledger",
 	[".cl|.el|.lisp|.lsp"] = "lisp",
 	[".litcoffee"] = "litcoffee",
 	[".lua"] = "lua",
-- 
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