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-- Copyright 2006-2024 Mitchell. See LICENSE.
-- JavaScript LPeg lexer.
local lexer = lexer
local P, S, B = lpeg.P, lpeg.S, lpeg.B
local lex = lexer.new(...)
-- Keywords.
lex:add_rule('keyword', lex:tag(lexer.KEYWORD, lex:word_match(lexer.KEYWORD)))
-- Types.
lex:add_rule('type', lex:tag(lexer.TYPE, lex:word_match(lexer.TYPE)))
-- Functions.
local builtin_func = -B('.') *
lex:tag(lexer.FUNCTION_BUILTIN, lex:word_match(lexer.FUNCTION_BUILTIN))
local func = lex:tag(lexer.FUNCTION, lexer.word)
local method = B('.') * lex:tag(lexer.FUNCTION_METHOD, lexer.word)
lex:add_rule('function', (builtin_func + method + func) * #(lexer.space^0 * '('))
-- Constants.
lex:add_rule('constant', lex:tag(lexer.CONSTANT_BUILTIN, lex:word_match(lexer.CONSTANT_BUILTIN)))
-- Identifiers.
lex:add_rule('identifier', lex:tag(lexer.IDENTIFIER, lexer.word))
-- Comments.
local line_comment = lexer.to_eol('//', true)
local block_comment = lexer.range('/*', '*/')
lex:add_rule('comment', lex:tag(lexer.COMMENT, line_comment + block_comment))
-- Strings.
local sq_str = lexer.range("'")
local dq_str = lexer.range('"')
local bq_str = lexer.range('`')
local string = lex:tag(lexer.STRING, sq_str + dq_str + bq_str)
local regex_str = lexer.after_set('+-*%^!=&|?:;,([{<>', lexer.range('/', true) * S('igm')^0)
local regex = lex:tag(lexer.REGEX, regex_str)
lex:add_rule('string', string + regex)
-- Numbers.
lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.number))
-- Operators.
lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('+-/*%^!=&|?:;,.()[]{}<>')))
-- Fold points.
lex:add_fold_point(lexer.OPERATOR, '{', '}')
lex:add_fold_point(lexer.COMMENT, '/*', '*/')
-- Word lists.
lex:set_word_list(lexer.KEYWORD, {
'abstract', 'async', 'await', 'boolean', 'break', 'byte', 'case', 'catch', 'char', 'class',
'const', 'continue', 'debugger', 'default', 'delete', 'do', 'double', 'else', 'enum', 'export',
'extends', 'false', 'final', 'finally', 'float', 'for', 'function', 'get', 'goto', 'if',
'implements', 'import', 'in', 'instanceof', 'int', 'interface', 'let', 'long', 'native', 'new',
'null', 'of', 'package', 'private', 'protected', 'public', 'return', 'set', 'short', 'static',
'super', 'switch', 'synchronized', 'this', 'throw', 'throws', 'transient', 'true', 'try',
'typeof', 'var', 'void', 'volatile', 'while', 'with', 'yield'
})
lex:set_word_list(lexer.TYPE, {
-- Fundamental objects.
'Object', 'Function', 'Boolean', 'Symbol',
-- Error Objects.
'Error', 'AggregateError', 'EvalError', 'InternalError', 'RangeError', 'ReferenceError',
'SyntaxError', 'TypeError', 'URIError',
-- Numbers and dates.
'Number', 'BigInt', 'Math', 'Date',
-- Text Processing.
'String', 'RegExp',
-- Indexed collections.
'Array', 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array',
'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array', 'BigInt64Array', 'BigUint64Array',
-- Keyed collections.
'Map', 'Set', 'WeakMap', 'WeakSet',
-- Structured data.
'ArrayBuffer', 'SharedArrayBuffer', 'Atomics', 'DataView', 'JSON',
-- Control abstraction objects.
'GeneratorFunction', 'AsyncGeneratorFunction', 'Generator', 'AsyncGenerator', 'AsyncFunction',
'Promise',
-- Reflection.
'Reflect', 'Proxy',
-- Other.
'Intl', 'WebAssembly'
})
lex:set_word_list(lexer.FUNCTION_BUILTIN, {
'eval', 'isFinite', 'isNaN', 'parseFloat', 'parseInt', 'decodeURI', 'decodeURIComponent',
'encodeURI', 'encodeURIComponent'
})
lex:set_word_list(lexer.CONSTANT_BUILTIN, 'Infinity NaN undefined globalThis arguments')
lexer.property['scintillua.comment'] = '//'
return lex
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