Add Myrddin lexer and filetypes entry

1 files changed, 72 insertions, 0 deletions

diff --git a/lua/lexers/myrddin.lua b/lua/lexers/myrddin.lua
new file mode 100644
index 0000000..a5b9b18
--- /dev/null
+++ b/lua/lexers/myrddin.lua
@@ -0,0 +1,72 @@
+-- Copyright 2017 Michael Forney. See LICENSE
+-- Myrddin LPeg lexer.
+
+local l = require('lexer')
+local token, word_match = l.token, l.word_match
+local P, R, S, V = lpeg.P, lpeg.R, lpeg.S, lpeg.V
+
+local M = {_NAME = 'myrddin'}
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments.
+local line_comment = '//' * l.nonnewline_esc^0
+local block_comment = P{
+  V'part' * P'*/'^-1,
+  part = '/*' * (V'full' + (l.any - '/*' - '*/'))^0,
+  full = V'part' * '*/',
+}
+local comment = token(l.COMMENT, line_comment + block_comment)
+
+-- 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 digit = l.digit + '_'
+local bdigit = R'01' + '_'
+local xdigit = l.xdigit + '_'
+local odigit = R'07' + '_'
+local integer = '0x' * xdigit^1 + '0o' * odigit^1 + '0b' * bdigit^1 + digit^1
+local float = digit^1 * (('.' * digit^1) * (S'eE' * S'+-'^-1 * digit^1)^-1 +
+                         ('.' * digit^1)^-1 * S'eE' * S'+-'^-1 * digit^1)
+local number = token(l.NUMBER, float + integer)
+
+-- Keywords.
+local keyword = token(l.KEYWORD, word_match{
+  'break', 'const', 'continue', 'elif', 'else', 'extern', 'false', 'for',
+  'generic', 'goto', 'if', 'impl', 'in', 'match', 'pkg', 'pkglocal', 'sizeof',
+  'struct', 'trait', 'true', 'type', 'union', 'use', 'var', 'while',
+})
+
+-- Types.
+local type = token(l.TYPE, word_match{
+  'void', 'bool', 'char', 'byte',
+  'int8', 'uint8',
+  'int16', 'uint16',
+  'int32', 'uint32',
+  'int64', 'uint64',
+  'int', 'uint',
+  'flt32', 'flt64',
+} + '@' * l.word)
+
+-- Identifiers.
+local identifier = token(l.IDENTIFIER, l.word)
+
+-- Operators.
+local operator = token(l.OPERATOR, S'`#_+-/*%<>~!=^&|~:;,.()[]{}')
+
+M._rules = {
+  {'whitespace', ws},
+  {'keyword', keyword},
+  {'type', type},
+  {'identifier', identifier},
+  {'string', string},
+  {'comment', comment},
+  {'number', number},
+  {'operator', operator},
+}
+
+return M