Added optional Lua lexer support.

This support is disabled by default and must be enabled via compile-time option.

1 files changed, 47 insertions, 0 deletions

diff --git a/lexlua/faust.lua b/lexlua/faust.lua
new file mode 100644
index 000000000..2865a633c
--- /dev/null
+++ b/lexlua/faust.lua
@@ -0,0 +1,47 @@
+-- Copyright 2015-2018 David B. Lamkins <david@lamkins.net>. See License.txt.
+-- Faust LPeg lexer, see http://faust.grame.fr/
+
+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('faust')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  declare import mdoctags dependencies distributed inputs outputs par seq sum
+  prod xor with environment library component ffunction fvariable fconstant int
+  float case waveform h: v: t:
+]]))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Strings.
+lex:add_rule('string', token(lexer.STRING, lexer.delimited_range('"', true)))
+
+-- 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))
+
+-- Numbers.
+local int = R('09')^1
+local rad = P('.')
+local exp = (P('e') * S('+-')^-1 * int)^-1
+local flt = int * (rad * int)^-1 * exp + int^-1 * rad * int * exp
+lex:add_rule('number', token(lexer.NUMBER, flt + int))
+
+-- Pragmas.
+lex:add_rule('pragma', token(lexer.PREPROCESSOR, P('<mdoc>') *
+                                                 (lexer.any - P('</mdoc>'))^0 *
+                                                 P('</mdoc>')^-1))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR,
+                               S('+-/*%<>~!=^&|?~:;,.()[]{}@#$`\\\'')))
+
+return lex