1 files changed, 57 insertions, 0 deletions
diff --git a/lexlua/antlr.lua b/lexlua/antlr.lua
new file mode 100644
index 000000000..7d1fa3b50
--- /dev/null
+++ b/lexlua/antlr.lua
@@ -0,0 +1,57 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- ANTLR LPeg lexer.
+
+local lexer = require('lexer')
+local token, word_match = lexer.token, lexer.word_match
+local P, R, S = lpeg.P, lpeg.R, lpeg.S
+
+local lex = lexer.new('antlr')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  abstract break case catch continue default do else extends final finally for
+  if implements instanceof native new private protected public return static
+  switch synchronized throw throws transient try volatile
+  while package import header options tokens strictfp
+  false null super this true
+]]))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match[[
+  boolean byte char class double float int interface long short void
+]]))
+
+-- Functions.
+lex:add_rule('func', token(lexer.FUNCTION, 'assert'))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Comments.
+local line_comment = '//' * lexer.nonnewline^0
+local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
+lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
+
+-- Actions.
+lex:add_rule('action', token(lexer.OPERATOR, P('{')) *
+                       token('action', (1 - P('}'))^0) *
+                       token(lexer.OPERATOR, P('}'))^-1)
+lex:add_style('action', lexer.STYLE_NOTHING)
+
+-- Strings.
+lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'", true)))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('$@:;|.=+*?~!^>-()[]{}')))
+
+-- Fold points.
+lex:add_fold_point(lexer.OPERATOR, ':', ';')
+lex:add_fold_point(lexer.OPERATOR, '(', ')')
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '/*', '*/')
+lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
+
+return lex