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-- Copyright 2023 Sam Nystrom <sam@samnystrom.dev>
-- Execline 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 = 'execline'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local comment = token(l.COMMENT, l.starts_line(S('#')) * l.nonnewline^0)
-- Strings.
local sq_str = l.range("'")
local dq_str = l.range('"')
local string = token(l.STRING, sq_str + dq_str)
-- Numbers.
local dec = l.digit^1 * ('_' * l.digit^1)^0
local oct_num = '0' * S('01234567_')^1
local integer = S('+-')^-1 * (l.hex_num + oct_num + dec)
local number = token(l.NUMBER, (l.float + integer))
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'execlineb', 'execline-cd', 'posix-cd', 'execline-umask', 'posix-umask',
'emptyenv', 'envfile', 'export', 'unexport', 'fdclose', 'fdblock', 'fdmove',
'fdswap', 'fdreserve', 'redirfd', 'piperw', 'heredoc', 'wait', 'getcwd',
'getpid', 'exec', 'tryexec', 'exit', 'trap', 'withstdinas',
'foreground', 'background', 'case', 'if', 'ifelse', 'ifte', 'ifthenelse',
'backtick', 'pipeline', 'runblock',
'define', 'importas', 'elglob', 'elgetpositionals', 'multidefine',
'multisubstitute',
'forx', 'forstdin', 'forbacktickx', 'loopwhilex',
'elgetopt', 'shift', 'dollarat',
'eltest', 'homeof',
'execline'
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
local variable = token(l.VARIABLE, '$' * (l.word + l.range('{}', true, true, true)))
-- Operators.
local operator = token(l.OPERATOR, S('{}'))
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'identifier', identifier},
{'string', string},
{'comment', comment},
{'number', number},
{'variable', variable},
{'operator', operator},
}
M._LEXBYLINE = true
return M
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