49 lines
1.6 KiB
Lua
Executable File
49 lines
1.6 KiB
Lua
Executable File
-- Copyright 2015-2019 Charles Lehner. See License.txt.
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-- ledger journal LPeg lexer, see http://www.ledger-cli.org/
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('ledger', {lex_by_line = true})
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local delim = P('\t') + P(' ')
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-- Account.
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lex:add_rule('account', token(lexer.VARIABLE,
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lexer.starts_line(S(' \t')^1 *
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(lexer.print - delim)^1)))
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-- Amount.
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lex:add_rule('amount', token(lexer.NUMBER, delim * (1 - S(';\r\n'))^1))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, S(';#') * lexer.nonnewline^0))
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Strings.
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local sq_str = lexer.delimited_range("'")
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local dq_str = lexer.delimited_range('"')
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local label = lexer.delimited_range('[]', true, true)
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str + label))
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-- Date.
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lex:add_rule('date', token(lexer.CONSTANT,
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lexer.starts_line((lexer.digit + S('/-'))^1)))
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-- Automated transactions.
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lex:add_rule('auto_tx', token(lexer.PREPROCESSOR,
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lexer.starts_line(S('=~') * lexer.nonnewline^0)))
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-- Directives.
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local directive_word = word_match[[
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account alias assert bucket capture check comment commodity define end fixed
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endfixed include payee apply tag test year
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]] + S('AYNDCIiOobh')
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lex:add_rule('directive', token(lexer.KEYWORD,
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lexer.starts_line(S('!@')^-1 * directive_word)))
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return lex
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