ruby.lua (5330B)
- -- Copyright 2006-2024 Mitchell. See LICENSE.
- -- Ruby LPeg lexer.
- local lexer = lexer
- local P, S = lpeg.P, lpeg.S
- local lex = lexer.new(...)
- -- Keywords.
- lex:add_rule('keyword', lex:tag(lexer.KEYWORD, lex:word_match(lexer.KEYWORD)))
- -- Functions.
- local builtin_func = lex:tag(lexer.FUNCTION_BUILTIN, lex:word_match(lexer.FUNCTION_BUILTIN))
- lex:add_rule('function', -lpeg.B('.') * builtin_func * -S('.:|'))
- -- Identifiers.
- local word_char = lexer.alnum + S('_!?')
- local word = (lexer.alpha + '_') * word_char^0
- lex:add_rule('identifier', lex:tag(lexer.IDENTIFIER, word))
- -- Comments.
- local line_comment = lexer.to_eol('#', true)
- local block_comment = lexer.range(lexer.starts_line('=begin'), lexer.starts_line('=end'))
- lex:add_rule('comment', lex:tag(lexer.COMMENT, block_comment + line_comment))
- -- Strings.
- local delimiter_matches = {['('] = ')', ['['] = ']', ['{'] = '}'}
- local literal_delimited = P(function(input, index)
- local delimiter = input:sub(index, index)
- if not delimiter:find('[%w\r\n\f\t ]') then -- only non alpha-numerics
- local match_pos, patt
- if delimiter_matches[delimiter] then
- -- Handle nested delimiter/matches in strings.
- local s, e = delimiter, delimiter_matches[delimiter]
- patt = lexer.range(s, e, false, true, true)
- else
- patt = lexer.range(delimiter)
- end
- match_pos = lpeg.match(patt, input, index)
- return match_pos or #input + 1
- end
- end)
- local cmd_str = lexer.range('`')
- local lit_cmd = '%x' * literal_delimited
- local lit_array = '%w' * literal_delimited
- local sq_str = lexer.range("'")
- local dq_str = lexer.range('"')
- local lit_str = '%' * S('qQ')^-1 * literal_delimited
- local heredoc = '<<' * P(function(input, index)
- local s, e, indented, _, delimiter = input:find('([%-~]?)(["`]?)([%a_][%w_]*)%2[\n\r\f;]+', index)
- if s == index and delimiter then
- local end_heredoc = (#indented > 0 and '[\n\r\f]+ *' or '[\n\r\f]+')
- s, e = input:find(end_heredoc .. delimiter, e)
- return e and e + 1 or #input + 1
- end
- end)
- local string = lex:tag(lexer.STRING, (sq_str + dq_str + lit_str + heredoc + cmd_str + lit_cmd +
- lit_array) * S('f')^-1)
- -- TODO: regex_str fails with `obj.method /patt/` syntax.
- local regex_str = lexer.after_set('!%^&*([{-=+|:;,?<>~', lexer.range('/', true) * S('iomx')^0)
- local lit_regex = '%r' * literal_delimited * S('iomx')^0
- local regex = lex:tag(lexer.REGEX, regex_str + lit_regex)
- lex:add_rule('string', string + regex)
- -- Numbers.
- local numeric_literal = '?' * (lexer.any - lexer.space) * -word_char -- TODO: meta, control, etc.
- lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.number_('_') * S('ri')^-1 + numeric_literal))
- -- Variables.
- local global_var = '$' *
- (word + S('!@L+`\'=~/\\,.;<>_*"$?:') + lexer.digit + '-' * S('0FadiIKlpvw'))
- local class_var = '@@' * word
- local inst_var = '@' * word
- lex:add_rule('variable', lex:tag(lexer.VARIABLE, global_var + class_var + inst_var))
- -- Symbols.
- lex:add_rule('symbol', lex:tag(lexer.STRING .. '.symbol', ':' * P(function(input, index)
- if input:sub(index - 2, index - 2) ~= ':' then return true end
- end) * (word_char^1 + sq_str + dq_str)))
- -- Operators.
- lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('!%^&*()[]{}-=+/|:;.,?<>~')))
- -- Fold points.
- local function disambiguate(text, pos, line, s)
- return line:sub(1, s - 1):match('^%s*$') and not text:sub(1, pos - 1):match('\\[ \t]*\r?\n$') and
- 1 or 0
- end
- lex:add_fold_point(lexer.KEYWORD, 'begin', 'end')
- lex:add_fold_point(lexer.KEYWORD, 'class', 'end')
- lex:add_fold_point(lexer.KEYWORD, 'def', 'end')
- lex:add_fold_point(lexer.KEYWORD, 'do', 'end')
- lex:add_fold_point(lexer.KEYWORD, 'for', 'end')
- lex:add_fold_point(lexer.KEYWORD, 'module', 'end')
- lex:add_fold_point(lexer.KEYWORD, 'case', 'end')
- lex:add_fold_point(lexer.KEYWORD, 'if', disambiguate)
- lex:add_fold_point(lexer.KEYWORD, 'while', disambiguate)
- lex:add_fold_point(lexer.KEYWORD, 'unless', disambiguate)
- lex:add_fold_point(lexer.KEYWORD, 'until', disambiguate)
- lex:add_fold_point(lexer.OPERATOR, '(', ')')
- lex:add_fold_point(lexer.OPERATOR, '[', ']')
- lex:add_fold_point(lexer.OPERATOR, '{', '}')
- lex:add_fold_point(lexer.COMMENT, '=begin', '=end')
- -- Word lists.
- lex:set_word_list(lexer.KEYWORD, {
- 'BEGIN', 'END', 'alias', 'and', 'begin', 'break', 'case', 'class', 'def', 'defined?', 'do',
- 'else', 'elsif', 'end', 'ensure', 'false', 'for', 'if', 'in', 'module', 'next', 'nil', 'not',
- 'or', 'redo', 'rescue', 'retry', 'return', 'self', 'super', 'then', 'true', 'undef', 'unless',
- 'until', 'when', 'while', 'yield', '__FILE__', '__LINE__'
- })
- lex:set_word_list(lexer.FUNCTION_BUILTIN, {
- 'at_exit', 'autoload', 'binding', 'caller', 'catch', 'chop', 'chop!', 'chomp', 'chomp!', 'eval',
- 'exec', 'exit', 'exit!', 'extend', 'fail', 'fork', 'format', 'gets', 'global_variables', 'gsub',
- 'gsub!', 'include', 'iterator?', 'lambda', 'load', 'local_variables', 'loop', 'module_function',
- 'open', 'p', 'print', 'printf', 'proc', 'putc', 'puts', 'raise', 'rand', 'readline', 'readlines',
- 'require', 'require_relative', 'select', 'sleep', 'split', 'sprintf', 'srand', 'sub', 'sub!',
- 'syscall', 'system', 'test', 'trace_var', 'trap', 'untrace_var'
- })
- lexer.property['scintillua.comment'] = '#'
- lexer.property['scintillua.word.chars'] =
- 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_?!'
- return lex