vis
a vi-like editor based on Plan 9's structural regular expressions
git clone https://9o.is/git/vis.git
moonscript.lua
(5316B)
1 -- Copyright 2016-2025 Alejandro Baez (https://keybase.io/baez). See LICENSE.
2 -- Moonscript LPeg lexer.
3
4 local lexer = require('lexer')
5 local token, word_match = lexer.token, lexer.word_match
6 local P, S = lpeg.P, lpeg.S
7
8 local lex = lexer.new('moonscript', {fold_by_indentation = true})
9
10 -- Whitespace.
11 lex:add_rule('whitspace', token(lexer.WHITESPACE, lexer.space^1))
12
13 -- Table keys.
14 lex:add_rule('tbl_key', token('tbl_key', lexer.word * ':' + ':' * lexer.word))
15 lex:add_style('tbl_key', lexer.styles.regex)
16
17 -- Keywords.
18 lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
19 -- Lua.
20 'and', 'break', 'do', 'else', 'elseif', 'false', 'for', 'if', 'in', 'local', 'nil', 'not', 'or',
21 'return', 'then', 'true', 'while',
22 -- Moonscript.
23 'continue', 'class', 'export', 'extends', 'from', 'import', 'super', 'switch', 'unless', 'using',
24 'when', 'with'
25 }))
26
27 -- Error words.
28 lex:add_rule('error', token(lexer.ERROR, word_match('function end')))
29
30 -- Self reference.
31 lex:add_rule('self_ref', token('self_ref', '@' * lexer.word^-1 + 'self'))
32 lex:add_style('self_ref', lexer.styles.label)
33
34 -- Functions.
35 lex:add_rule('function', token(lexer.FUNCTION, word_match{
36 'assert', 'collectgarbage', 'dofile', 'error', 'getmetatable', 'ipairs', 'load', 'loadfile',
37 'next', 'pairs', 'pcall', 'print', 'rawequal', 'rawget', 'rawset', 'require', 'select',
38 'setmetatable', 'tonumber', 'tostring', 'type', 'xpcall',
39 -- Added in 5.2.
40 'rawlen'
41 }))
42
43 -- Constants.
44 lex:add_rule('constant', token(lexer.CONSTANT, word_match{
45 '_G', '_VERSION',
46 -- Added in 5.2.
47 '_ENV'
48 }))
49
50 -- Libraries.
51 lex:add_rule('library', token(lexer.FUNCTION_BUILTIN, word_match{
52 -- Coroutine.
53 'coroutine', 'coroutine.create', 'coroutine.resume', 'coroutine.running', 'coroutine.status',
54 'coroutine.wrap', 'coroutine.yield',
55 -- Coroutine added in 5.3.
56 'coroutine.isyieldable',
57 -- Module.
58 'package', 'package.cpath', 'package.loaded', 'package.loadlib', 'package.path',
59 'package.preload',
60 -- Module added in 5.2.
61 'package.config', 'package.searchers', 'package.searchpath',
62 -- UTF-8 added in 5.3.
63 'utf8', 'utf8.char', 'utf8.charpattern', 'utf8.codepoint', 'utf8.codes', 'utf8.len',
64 'utf8.offset',
65 -- String.
66 'string', 'string.byte', 'string.char', 'string.dump', 'string.find', 'string.format',
67 'string.gmatch', 'string.gsub', 'string.len', 'string.lower', 'string.match', 'string.rep',
68 'string.reverse', 'string.sub', 'string.upper',
69 -- String added in 5.3.
70 'string.pack', 'string.packsize', 'string.unpack',
71 -- Table.
72 'table', 'table.concat', 'table.insert', 'table.remove', 'table.sort',
73 -- Table added in 5.2.
74 'table.pack', 'table.unpack',
75 -- Table added in 5.3.
76 'table.move',
77 -- Math.
78 'math', 'math.abs', 'math.acos', 'math.asin', 'math.atan', 'math.ceil', 'math.cos', 'math.deg',
79 'math.exp', 'math.floor', 'math.fmod', 'math.huge', 'math.log', 'math.max', 'math.min',
80 'math.modf', 'math.pi', 'math.rad', 'math.random', 'math.randomseed', 'math.sin', 'math.sqrt',
81 'math.tan',
82 -- Math added in 5.3.
83 'math.maxinteger', 'math.mininteger', 'math.tointeger', 'math.type', 'math.ult',
84 -- IO.
85 'io', 'io.close', 'io.flush', 'io.input', 'io.lines', 'io.open', 'io.output', 'io.popen',
86 'io.read', 'io.stderr', 'io.stdin', 'io.stdout', 'io.tmpfile', 'io.type', 'io.write',
87 -- OS.
88 'os', 'os.clock', 'os.date', 'os.difftime', 'os.execute', 'os.exit', 'os.getenv', 'os.remove',
89 'os.rename', 'os.setlocale', 'os.time', 'os.tmpname',
90 -- Debug.
91 'debug', 'debug.debug', 'debug.gethook', 'debug.getinfo', 'debug.getlocal', 'debug.getmetatable',
92 'debug.getregistry', 'debug.getupvalue', 'debug.sethook', 'debug.setlocal', 'debug.setmetatable',
93 'debug.setupvalue', 'debug.traceback',
94 -- Debug added in 5.2.
95 'debug.getuservalue', 'debug.setuservalue', 'debug.upvalueid', 'debug.upvaluejoin',
96
97 -- MoonScript 0.3.1 standard library.
98 -- Printing functions.
99 'p',
100 -- Table functions.
101 'run_with_scope', 'defaultbl', 'extend', 'copy',
102 -- Class/object functions.
103 'is_object', 'bind_methods', 'mixin', 'mixin_object', 'mixin_table',
104 -- Misc functions.
105 'fold',
106 -- Debug functions.
107 'debug.upvalue'
108 }))
109
110 -- Identifiers.
111 local identifier = token(lexer.IDENTIFIER, lexer.word)
112 local proper_ident = token('proper_ident', lexer.upper * lexer.word)
113 lex:add_rule('identifier', proper_ident + identifier)
114 lex:add_style('proper_ident', lexer.styles.class)
115
116 -- Strings.
117 local sq_str = lexer.range("'", false, false)
118 local dq_str = lexer.range('"', false, false)
119 local longstring = lpeg.Cmt('[' * lpeg.C(P('=')^0) * '[', function(input, index, eq)
120 local _, e = input:find(']' .. eq .. ']', index, true)
121 return (e or #input) + 1
122 end)
123 lex:add_rule('string', token(lexer.STRING, sq_str + dq_str) + token(lexer.STRING, longstring))
124
125 -- Comments.
126 local line_comment = lexer.to_eol('--')
127 local block_comment = '--' * longstring
128 lex:add_rule('comment', token(lexer.COMMENT, block_comment + line_comment))
129
130 -- Numbers.
131 lex:add_rule('number', token(lexer.NUMBER, lexer.number))
132
133 -- Function definition.
134 lex:add_rule('fndef', token('fndef', P('->') + '=>'))
135 lex:add_style('fndef', lexer.styles.preprocessor)
136
137 -- Operators.
138 lex:add_rule('operator', token(lexer.OPERATOR, S('+-*!\\/%^#=<>;:,.')))
139 lex:add_rule('symbol', token('symbol', S('(){}[]')))
140 lex:add_style('symbol', lexer.styles.embedded)
141
142 lexer.property['scintillua.comment'] = '--'
143
144 return lex