vis

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

(2354B)
      1 -- Copyright 2006-2025 Mitchell. See LICENSE.
      2 -- Go LPeg lexer.
      3 
      4 local lexer = lexer
      5 local P, S = lpeg.P, lpeg.S
      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 -- Constants.
     13 lex:add_rule('constant', lex:tag(lexer.CONSTANT_BUILTIN, lex:word_match(lexer.CONSTANT_BUILTIN)))
     14 
     15 -- Types.
     16 lex:add_rule('type', lex:tag(lexer.TYPE, lex:word_match(lexer.TYPE)))
     17 
     18 -- Functions.
     19 local builtin_func = -lpeg.B('.') *
     20 	lex:tag(lexer.FUNCTION_BUILTIN, lex:word_match(lexer.FUNCTION_BUILTIN))
     21 local func = lex:tag(lexer.FUNCTION, lexer.word)
     22 local method = lpeg.B('.') * lex:tag(lexer.FUNCTION_METHOD, lexer.word)
     23 lex:add_rule('function', (builtin_func + method + func) * #(lexer.space^0 * '('))
     24 
     25 -- Identifiers.
     26 lex:add_rule('identifier', lex:tag(lexer.IDENTIFIER, lexer.word))
     27 
     28 -- Strings.
     29 local sq_str = lexer.range("'", true)
     30 local dq_str = lexer.range('"', true)
     31 local raw_str = lexer.range('`', false, false)
     32 lex:add_rule('string', lex:tag(lexer.STRING, sq_str + dq_str + raw_str))
     33 
     34 -- Comments.
     35 local line_comment = lexer.to_eol('//')
     36 local block_comment = lexer.range('/*', '*/')
     37 lex:add_rule('comment', lex:tag(lexer.COMMENT, line_comment + block_comment))
     38 
     39 -- Numbers.
     40 lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.number * P('i')^-1))
     41 
     42 -- Operators.
     43 lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('+-*/%&|^<>=!~:;.,()[]{}')))
     44 
     45 -- Fold points.
     46 lex:add_fold_point(lexer.OPERATOR, '{', '}')
     47 lex:add_fold_point(lexer.COMMENT, '/*', '*/')
     48 
     49 -- Word lists.
     50 lex:set_word_list(lexer.KEYWORD, {
     51 	'break', 'case', 'chan', 'const', 'continue', 'default', 'defer', 'else', 'fallthrough', 'for',
     52 	'func', 'go', 'goto', 'if', 'import', 'interface', 'map', 'package', 'range', 'return', 'select',
     53 	'struct', 'switch', 'type', 'var'
     54 })
     55 
     56 lex:set_word_list(lexer.CONSTANT_BUILTIN, 'true false iota nil')
     57 
     58 lex:set_word_list(lexer.TYPE, {
     59 	'any', 'bool', 'byte', 'comparable', 'complex64', 'complex128', 'error', 'float32', 'float64',
     60 	'int', 'int8', 'int16', 'int32', 'int64', 'rune', 'string', 'uint', 'uint8', 'uint16', 'uint32',
     61 	'uint64', 'uintptr'
     62 })
     63 
     64 lex:set_word_list(lexer.FUNCTION_BUILTIN, {
     65 	'append', 'cap', 'close', 'complex', 'copy', 'delete', 'imag', 'len', 'make', 'new', 'panic',
     66 	'print', 'println', 'real', 'recover'
     67 })
     68 
     69 lexer.property['scintillua.comment'] = '//'
     70 
     71 return lex