-- Copyright (c) 2016-2018 Larry Hynes. See License.txt.
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-- Taskpaper LPeg lexer
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local lexer = require('lexer')
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local token = lexer.token
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local M = {_NAME = 'taskpaper'}
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local delimiter = P(' ') + P('\t')
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-- Whitespace
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local ws = token(lexer.WHITESPACE, lexer.space^1)
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-- Tags
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local day_tag = token('day_tag', (P('@today') + P('@tomorrow')))
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local overdue_tag = token('overdue_tag', P('@overdue'))
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local plain_tag = token('plain_tag', P('@') * lexer.word)
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local extended_tag = token('extended_tag',
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P('@') * lexer.word * P('(') *
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(lexer.word + R('09') + P('-'))^1 * P(')'))
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-- Projects
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local project = token('project',
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lexer.nested_pair(lexer.starts_line(lexer.alnum), ':') *
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lexer.newline)
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-- Notes
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local note = token('note', delimiter^1 * lexer.alnum * lexer.nonnewline^0)
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-- Tasks
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local task = token('task', delimiter^1 * P('-') + lexer.newline)
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M._rules = {
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{'note', note},
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{'task', task},
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{'project', project},
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{'extended_tag', extended_tag},
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{'day_tag', day_tag},
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{'overdue_tag', overdue_tag},
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{'plain_tag', plain_tag},
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{'whitespace', ws},
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}
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M._tokenstyles = {
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note = lexer.STYLE_CONSTANT,
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task = lexer.STYLE_FUNCTION,
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project = lexer.STYLE_TAG,
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extended_tag = lexer.STYLE_COMMENT,
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day_tag = lexer.STYLE_CLASS,
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overdue_tag = lexer.STYLE_PREPROCESSOR,
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plain_tag = lexer.STYLE_COMMENT,
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}
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M._LEXBYLINE = true
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return M
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