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-- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
-- Diff 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 = 'diff'}
-- Text, separators, and file headers.
local index = token(l.COMMENT, 'Index: ' * l.any^0 * P(-1))
local separator = token(l.COMMENT, ('---' + P('*')^4 + P('=')^1) * l.space^0 *
-1)
local header = token('header', (P('*** ') + '--- ' + '+++ ') * l.any^1)
-- Location.
local location = token(l.NUMBER, ('@@' + l.digit^1 + '****') * l.any^1)
-- Additions, deletions, and changes.
local addition = token('addition', S('>+') * l.any^0)
local deletion = token('deletion', S('<-') * l.any^0)
local change = token('change', '! ' * l.any^0)
M._rules = {
{'index', index},
{'separator', separator},
{'header', header},
{'location', location},
{'addition', addition},
{'deletion', deletion},
{'change', change},
{'any_line', token('default', l.any^1)},
}
M._tokenstyles = {
header = l.STYLE_COMMENT,
addition = 'fore:green',
deletion = 'fore:red',
change = 'fore:yellow',
}
M._LEXBYLINE = true
return M
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