Adds basic Reason ML lexer.

See https://reasonml.github.io/docs/en/comparison-to-ocaml.html
for major differences between Reason and OCaml.

2 files changed, 87 insertions, 0 deletions

diff --git a/lua/lexers/reason.lua b/lua/lexers/reason.lua
new file mode 100644
index 0000000..eb5a727
--- /dev/null
+++ b/lua/lexers/reason.lua
@@ -0,0 +1,84 @@
+-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
+-- Reason LPeg lexer.
+
+local l = require('lexer')
+local token, word_match = l.token, l.word_match
+local P, R, S = lpeg.P, lpeg.R, lpeg.S
+
+local M = {_NAME = 'reason'}
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments.
+local comment = token(l.COMMENT, l.nested_pair('/*', '*/'))
+
+-- Strings.
+local sq_str = l.delimited_range("'", true)
+local dq_str = l.delimited_range('"', true)
+local string = token(l.STRING, sq_str + dq_str)
+
+-- Numbers.
+local number = token(l.NUMBER, l.float + l.integer)
+
+-- Keywords.
+local keyword = token(l.KEYWORD, word_match{
+  'and', 'as', 'asr', 'begin', 'class', 'closed', 'constraint', 'do', 'done',
+  'downto', 'else', 'end', 'exception', 'external', 'failwith', 'false',
+  'flush', 'for', 'fun', 'function', 'functor', 'if', 'in', 'include',
+  'inherit',  'incr', 'land', 'let', 'load', 'los', 'lsl', 'lsr', 'lxor',
+  'method', 'mod', 'module', 'mutable', 'new', 'not', 'of', 'open', 'option',
+  'or', 'parser', 'private', 'ref', 'rec', 'raise', 'regexp', 'sig', 'struct',
+  'stdout', 'stdin', 'stderr', 'switch', 'then', 'to', 'true', 'try', 'type',
+  'val', 'virtual', 'when', 'while', 'with'
+})
+
+-- Types.
+local type = token(l.TYPE, word_match{
+  'int', 'float', 'bool', 'char', 'string', 'unit'
+})
+
+-- Functions.
+
+local func = token(l.FUNCTION, word_match{
+  'raise', 'invalid_arg', 'failwith', 'compare', 'min', 'max', 'succ', 'pred',
+  'mod', 'abs', 'max_int', 'min_int', 'sqrt', 'exp', 'log', 'log10', 'cos',
+  'sin', 'tan', 'acos', 'asin', 'atan', 'atan2', 'cosh', 'sinh', 'tanh', 'ceil',
+  'floor', 'abs_float', 'mod_float', 'frexp', 'ldexp', 'modf', 'float',
+  'float_of_int', 'truncate', 'int_of_float', 'infinity', 'nan', 'max_float',
+  'min_float', 'epsilon_float', 'classify_float', 'int_of_char', 'char_of_int',
+  'ignore', 'string_of_bool', 'bool_of_string', 'string_of_int',
+  'int_of_string', 'string_of_float', 'float_of_string', 'fst', 'snd', 'stdin',
+  'stdout', 'stderr', 'print_char', 'print_string', 'print_int', 'print_float',
+  'print_endline', 'print_newline', 'prerr_char', 'prerr_string', 'prerr_int',
+  'prerr_float', 'prerr_endline', 'prerr_newline', 'read_line', 'read_int',
+  'read_float', 'open_out', 'open_out_bin', 'open_out_gen', 'flush',
+  'flush_all', 'output_char', 'output_string', 'output', 'output_byte',
+  'output_binary_int', 'output_value', 'seek_out', 'pos_out',
+  'out_channel_length', 'close_out', 'close_out_noerr', 'set_binary_mode_out',
+  'open_in', 'open_in_bin', 'open_in_gen', 'input_char', 'input_line', 'input',
+  'really_input', 'input_byte', 'input_binary_int', 'input_value', 'seek_in',
+  'pos_in', 'in_channel_length', 'close_in', 'close_in_noerr',
+  'set_binary_mode_in', 'incr', 'decr', 'string_of_format', 'format_of_string',
+  'exit', 'at_exit'
+})
+
+-- Identifiers.
+local identifier = token(l.IDENTIFIER, l.word)
+
+-- Operators.
+local operator = token(l.OPERATOR, S('=<>+-*/.,:;~!#%^&|?[](){}'))
+
+M._rules = {
+  {'whitespace', ws},
+  {'keyword', keyword},
+  {'type', type},
+  {'function', func},
+  {'identifier', identifier},
+  {'string', string},
+  {'comment', comment},
+  {'number', number},
+  {'operator', operator},
+}
+
+return M
diff --git a/lua/plugins/filetype.lua b/lua/plugins/filetype.lua
index 5e8c8ee..04f611c 100644
--- a/lua/plugins/filetype.lua
+++ b/lua/plugins/filetype.lua
@@ -303,6 +303,9 @@ vis.ftdetect.filetypes = {
 		ext = { "%.sc$", "%.py$", "%.pyw$" },
 		mime = { "text/x-python" },
 	},
+	reason = {
+		ext = { "%.re$" },
+	},
 	rc = {
 		ext = { "%.rc$", "%.es$" },
 	},