lexers/powershell.lua

   1 -- Copyright 2015-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
   2 -- PowerShell LPeg lexer.
   3 -- Contributed by Jeff Stone.
   4
   5 local l = require('lexer')
   6 local token, word_match = l.token, l.word_match
   7 local P, R, S = lpeg.P, lpeg.R, lpeg.S
   8
   9 local M = {_NAME = 'powershell'}
  10
  11 -- Whitespace.
  12 local ws = token(l.WHITESPACE, l.space^1)
  13
  14 -- Comments.
  15 local comment = token(l.COMMENT, '#' * l.nonnewline^0)
  16
  17 -- Keywords.
  18 local keyword = token(l.KEYWORD, word_match({
  19   'Begin', 'Break', 'Continue', 'Do', 'Else', 'End', 'Exit', 'For', 'ForEach',
  20   'ForEach-Object', 'Get-Date', 'Get-Random', 'If', 'Param', 'Pause',
  21   'Powershell', 'Process', 'Read-Host', 'Return', 'Switch', 'While',
  22   'Write-Host'
  23 }, '-', true))
  24
  25 -- Comparison Operators.
  26 local comparison = token(l.KEYWORD, '-' * word_match({
  27   'and', 'as', 'band', 'bor', 'contains', 'eq', 'ge', 'gt', 'is', 'isnot', 'le',
  28   'like', 'lt', 'match', 'ne', 'nomatch', 'not', 'notcontains', 'notlike', 'or',
  29   'replace'
  30 }, nil, true))
  31
  32 -- Parameters.
  33 local parameter = token(l.KEYWORD, '-' * word_match({
  34   'Confirm', 'Debug', 'ErrorAction', 'ErrorVariable', 'OutBuffer',
  35   'OutVariable', 'Verbose', 'WhatIf'
  36 }, nil, true))
  37
  38 -- Properties.
  39 local property = token(l.KEYWORD, '.' * word_match({
  40   'day', 'dayofweek', 'dayofyear', 'hour', 'millisecond', 'minute', 'month',
  41   'second', 'timeofday', 'year'
  42 }, nil, true))
  43
  44 -- Types.
  45 local type = token(l.KEYWORD, '[' * word_match({
  46   'array', 'boolean', 'byte', 'char', 'datetime', 'decimal', 'double',
  47   'hashtable', 'int', 'long', 'single', 'string', 'xml'
  48 }, nil, true) * ']')
  49
  50 -- Variables.
  51 local variable = token(l.VARIABLE, '$' * (l.digit^1 + l.word +
  52                                           l.delimited_range('{}', true, true)))
  53
  54 -- Strings.
  55 local string = token(l.STRING, l.delimited_range('"', true))
  56
  57 -- Numbers.
  58 local number = token(l.NUMBER, l.float + l.integer)
  59
  60 -- Operators.
  61 local operator = token(l.OPERATOR, S('=!<>+-/*^&|~.,:;?()[]{}%`'))
  62
  63 M._rules = {
  64   {'whitespace', ws},
  65   {'comment', comment},
  66   {'keyword', keyword},
  67   {'comparison', comparison},
  68   {'parameter', parameter},
  69   {'property', property},
  70   {'type', type},
  71   {'variable', variable},
  72   {'string', string},
  73   {'number', number},
  74   {'operator', operator},
  75 }
  76
  77 M._foldsymbols = {
  78   _patterns = {'[{}]'},
  79   [l.OPERATOR] = {['{'] = 1, ['}'] = -1}
  80 }
  81
  82 return M