1 files changed, 59 insertions, 0 deletions
diff --git a/lexlua/fsharp.lua b/lexlua/fsharp.lua
new file mode 100644
index 000000000..b651d5fe5
--- /dev/null
+++ b/lexlua/fsharp.lua
@@ -0,0 +1,59 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- F# 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('fsharp', {fold_by_indentation = true})
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  abstract and as assert asr begin class default delegate do done downcast
+  downto else end enum exception false finaly for fun function if in iherit
+  interface land lazy let lor lsl lsr lxor match member mod module mutable
+  namespace new null of open or override sig static struct then to true try type
+  val when inline upcast while with async atomic break checked component const
+  constructor continue eager event external fixed functor include method mixin
+  process property protected public pure readonly return sealed switch virtual
+  void volatile where
+  -- Booleans.
+  true false
+]]))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match[[
+  bool byte sbyte int16 uint16 int uint32 int64 uint64 nativeint unativeint char
+  string decimal unit void float32 single float double
+]]))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Strings.
+lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'", true) +
+                                           lexer.delimited_range('"', true)))
+
+-- Comments.
+lex:add_rule('comment', token(lexer.COMMENT, '//' * lexer.nonnewline^0 +
+                                             lexer.nested_pair('(*', '*)')))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, (lexer.float +
+                                            lexer.integer * S('uUlL')^-1)))
+
+-- Preprocessor.
+local preproc_word = word_match[[
+  else endif endregion if ifdef ifndef light region
+]]
+lex:add_rule('preproc', token(lexer.PREPROCESSOR, lexer.starts_line('#') *
+                                                  S('\t ')^0 * preproc_word))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR,
+                               S('=<>+-*/^.,:;~!@#%^&|?[](){}')))
+
+return lex