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