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-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
-- Lua LPeg lexer.
-- Original written by Peter Odding, 2007/04/04.
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 = 'fennel'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local line_comment = ';' * l.nonnewline^0
local comment = token(l.COMMENT, line_comment)
-- Strings.
local dq_str = l.delimited_range('"')
local string = token(l.STRING, dq_str)
-- Numbers.
local lua_integer = P('-')^-1 * (l.hex_num + l.dec_num)
local number = token(l.NUMBER, l.float + lua_integer)
-- Keywords.
local keyword = token(l.KEYWORD, word_match({
'%', '*', '+', '-', '->', '->>', '-?>', '-?>>', '.', '..', '/', '//', ':', '<', '<=', '=', '>', '>=', '^', '~=', 'λ',
'and', 'comment', 'do', 'doc', 'doto', 'each', 'eval-compiler', 'fn', 'for', 'global', 'hashfn', 'if', 'include', 'lambda',
'length', 'let', 'local', 'lua', 'macro', 'macros', 'match', 'not', 'not=', 'or', 'partial', 'quote', 'require-macros',
'set', 'set-forcibly!', 'tset', 'values', 'var', 'when', 'while'
}, "%*+-./:<=>?~^λ!"))
-- Libraries.
local library = token('library', word_match({
-- Coroutine.
'coroutine', 'coroutine.create', 'coroutine.resume', 'coroutine.running',
'coroutine.status', 'coroutine.wrap', 'coroutine.yield',
-- Module.
'package', 'package.cpath', 'package.loaded', 'package.loadlib',
'package.path', 'package.preload',
-- String.
'string', 'string.byte', 'string.char', 'string.dump', 'string.find',
'string.format', 'string.gmatch', 'string.gsub', 'string.len', 'string.lower',
'string.match', 'string.rep', 'string.reverse', 'string.sub', 'string.upper',
-- Table.
'table', 'table.concat', 'table.insert', 'table.remove', 'table.sort',
-- Math.
'math', 'math.abs', 'math.acos', 'math.asin', 'math.atan', 'math.ceil',
'math.cos', 'math.deg', 'math.exp', 'math.floor', 'math.fmod', 'math.huge',
'math.log', 'math.max', 'math.min', 'math.modf', 'math.pi', 'math.rad',
'math.random', 'math.randomseed', 'math.sin', 'math.sqrt', 'math.tan',
-- IO.
'io', 'io.close', 'io.flush', 'io.input', 'io.lines', 'io.open', 'io.output',
'io.popen', 'io.read', 'io.stderr', 'io.stdin', 'io.stdout', 'io.tmpfile',
'io.type', 'io.write',
-- OS.
'os', 'os.clock', 'os.date', 'os.difftime', 'os.execute', 'os.exit',
'os.getenv', 'os.remove', 'os.rename', 'os.setlocale', 'os.time',
'os.tmpname',
-- Debug.
'debug', 'debug.debug', 'debug.gethook', 'debug.getinfo', 'debug.getlocal',
'debug.getmetatable', 'debug.getregistry', 'debug.getupvalue',
'debug.sethook', 'debug.setlocal', 'debug.setmetatable', 'debug.setupvalue',
'debug.traceback',
}, '.'))
local initial = l.alpha + S"|$%&#*+-./:<=>?~^_λ!"
local subsequent = initial + l.digit
-- Identifiers.
local identifier = token(l.IDENTIFIER, initial * subsequent^0)
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'library', library},
{'identifier', identifier},
{'string', string},
{'comment', comment},
{'number', number}
}
M._tokenstyles = {
library = l.STYLE_TYPE,
}
return M
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