vis

a vi-like editor based on Plan 9's structural regular expressions
javascript.lua

(3586B)
      1 -- Copyright 2006-2025 Mitchell. See LICENSE.
      2 -- JavaScript LPeg lexer.
      3 
      4 local lexer = lexer
      5 local P, S, B = lpeg.P, lpeg.S, lpeg.B
      6 
      7 local lex = lexer.new(...)
      8 
      9 -- Keywords.
     10 lex:add_rule('keyword', lex:tag(lexer.KEYWORD, lex:word_match(lexer.KEYWORD)))
     11 
     12 -- Types.
     13 lex:add_rule('type', lex:tag(lexer.TYPE, lex:word_match(lexer.TYPE)))
     14 
     15 -- Functions.
     16 local builtin_func = -B('.') *
     17 	lex:tag(lexer.FUNCTION_BUILTIN, lex:word_match(lexer.FUNCTION_BUILTIN))
     18 local func = lex:tag(lexer.FUNCTION, lexer.word)
     19 local method = B('.') * lex:tag(lexer.FUNCTION_METHOD, lexer.word)
     20 lex:add_rule('function', (builtin_func + method + func) * #(lexer.space^0 * '('))
     21 
     22 -- Constants.
     23 lex:add_rule('constant', lex:tag(lexer.CONSTANT_BUILTIN, lex:word_match(lexer.CONSTANT_BUILTIN)))
     24 
     25 -- Identifiers.
     26 lex:add_rule('identifier', lex:tag(lexer.IDENTIFIER, lexer.word))
     27 
     28 -- Comments.
     29 local line_comment = lexer.to_eol('//', true)
     30 local block_comment = lexer.range('/*', '*/')
     31 lex:add_rule('comment', lex:tag(lexer.COMMENT, line_comment + block_comment))
     32 
     33 -- Strings.
     34 local sq_str = lexer.range("'")
     35 local dq_str = lexer.range('"')
     36 local bq_str = lexer.range('`')
     37 local string = lex:tag(lexer.STRING, sq_str + dq_str + bq_str)
     38 local regex_str = lexer.after_set('+-*%^!=&|?:;,([{<>', lexer.range('/', true) * S('igm')^0)
     39 local regex = lex:tag(lexer.REGEX, regex_str)
     40 lex:add_rule('string', string + regex)
     41 
     42 -- Numbers.
     43 lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.number))
     44 
     45 -- Operators.
     46 lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('+-/*%^!=&|?:;,.()[]{}<>')))
     47 
     48 -- Fold points.
     49 lex:add_fold_point(lexer.OPERATOR, '{', '}')
     50 lex:add_fold_point(lexer.COMMENT, '/*', '*/')
     51 
     52 -- Word lists.
     53 lex:set_word_list(lexer.KEYWORD, {
     54 	'abstract', 'async', 'await', 'boolean', 'break', 'byte', 'case', 'catch', 'char', 'class',
     55 	'const', 'continue', 'debugger', 'default', 'delete', 'do', 'double', 'else', 'enum', 'export',
     56 	'extends', 'false', 'final', 'finally', 'float', 'for', 'function', 'get', 'goto', 'if',
     57 	'implements', 'import', 'in', 'instanceof', 'int', 'interface', 'let', 'long', 'native', 'new',
     58 	'null', 'of', 'package', 'private', 'protected', 'public', 'return', 'set', 'short', 'static',
     59 	'super', 'switch', 'synchronized', 'this', 'throw', 'throws', 'transient', 'true', 'try',
     60 	'typeof', 'var', 'void', 'volatile', 'while', 'with', 'yield'
     61 })
     62 
     63 lex:set_word_list(lexer.TYPE, {
     64 	-- Fundamental objects.
     65 	'Object', 'Function', 'Boolean', 'Symbol',
     66 	-- Error Objects.
     67 	'Error', 'AggregateError', 'EvalError', 'InternalError', 'RangeError', 'ReferenceError',
     68 	'SyntaxError', 'TypeError', 'URIError',
     69 	-- Numbers and dates.
     70 	'Number', 'BigInt', 'Math', 'Date',
     71 	-- Text Processing.
     72 	'String', 'RegExp',
     73 	-- Indexed collections.
     74 	'Array', 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array',
     75 	'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array', 'BigInt64Array', 'BigUint64Array',
     76 	-- Keyed collections.
     77 	'Map', 'Set', 'WeakMap', 'WeakSet',
     78 	-- Structured data.
     79 	'ArrayBuffer', 'SharedArrayBuffer', 'Atomics', 'DataView', 'JSON',
     80 	-- Control abstraction objects.
     81 	'GeneratorFunction', 'AsyncGeneratorFunction', 'Generator', 'AsyncGenerator', 'AsyncFunction',
     82 	'Promise',
     83 	-- Reflection.
     84 	'Reflect', 'Proxy',
     85 	-- Other.
     86 	'Intl', 'WebAssembly'
     87 })
     88 
     89 lex:set_word_list(lexer.FUNCTION_BUILTIN, {
     90 	'eval', 'isFinite', 'isNaN', 'parseFloat', 'parseInt', 'decodeURI', 'decodeURIComponent',
     91 	'encodeURI', 'encodeURIComponent'
     92 })
     93 
     94 lex:set_word_list(lexer.CONSTANT_BUILTIN, 'Infinity NaN undefined globalThis arguments')
     95 
     96 lexer.property['scintillua.comment'] = '//'
     97 
     98 return lex