vis

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

(2442B)
      1 -- Copyright 2006-2025 Mitchell. See LICENSE.
      2 -- Boo 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('boo')
      9 
     10 -- Whitespace.
     11 lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
     12 
     13 -- Keywords.
     14 lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
     15 	'and', 'break', 'cast', 'continue', 'elif', 'else', 'ensure', 'except', 'for', 'given', 'goto',
     16 	'if', 'in', 'isa', 'is', 'not', 'or', 'otherwise', 'pass', 'raise', 'ref', 'try', 'unless',
     17 	'when', 'while',
     18 	-- Definitions.
     19 	'abstract', 'callable', 'class', 'constructor', 'def', 'destructor', 'do', 'enum', 'event',
     20 	'final', 'get', 'interface', 'internal', 'of', 'override', 'partial', 'private', 'protected',
     21 	'public', 'return', 'set', 'static', 'struct', 'transient', 'virtual', 'yield',
     22 	-- Namespaces.
     23 	'as', 'from', 'import', 'namespace',
     24 	-- Other.
     25 	'self', 'super', 'null', 'true', 'false'
     26 }))
     27 
     28 -- Types.
     29 lex:add_rule('type', token(lexer.TYPE, word_match{
     30 	'bool', 'byte', 'char', 'date', 'decimal', 'double', 'duck', 'float', 'int', 'long', 'object',
     31 	'operator', 'regex', 'sbyte', 'short', 'single', 'string', 'timespan', 'uint', 'ulong', 'ushort'
     32 }))
     33 
     34 -- Functions.
     35 lex:add_rule('function', token(lexer.FUNCTION, word_match{
     36 	'array', 'assert', 'checked', 'enumerate', '__eval__', 'filter', 'getter', 'len', 'lock', 'map',
     37 	'matrix', 'max', 'min', 'normalArrayIndexing', 'print', 'property', 'range', 'rawArrayIndexing',
     38 	'required', '__switch__', 'typeof', 'unchecked', 'using', 'yieldAll', 'zip'
     39 }))
     40 
     41 -- Identifiers.
     42 lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
     43 
     44 -- Strings.
     45 local sq_str = lexer.range("'", true)
     46 local dq_str = lexer.range('"', true)
     47 local tq_str = lexer.range('"""')
     48 local string = token(lexer.STRING, tq_str + sq_str + dq_str)
     49 local regex_str = lexer.after_set('!%^&*([{-=+|:;,?<>~', lexer.range('/', true))
     50 local regex = token(lexer.REGEX, regex_str)
     51 lex:add_rule('string', string + regex)
     52 
     53 -- Comments.
     54 local line_comment = lexer.to_eol('#', true)
     55 local block_comment = lexer.range('/*', '*/')
     56 lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
     57 
     58 -- Numbers.
     59 lex:add_rule('number', token(lexer.NUMBER, lexer.number * (S('msdhsfFlL') + 'ms')^-1))
     60 
     61 -- Operators.
     62 lex:add_rule('operator', token(lexer.OPERATOR, S('!%^&*()[]{}-=+/|:;.,?<>~`')))
     63 
     64 lexer.property['scintillua.comment'] = '#'
     65 
     66 return lex