Added optional Lua lexer support.

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

1 files changed, 29 insertions, 0 deletions

diff --git a/lexlua/man.lua b/lexlua/man.lua
new file mode 100644
index 000000000..c5f8d5a51
--- /dev/null
+++ b/lexlua/man.lua
@@ -0,0 +1,29 @@
+-- Copyright 2015-2018 David B. Lamkins <david@lamkins.net>. See License.txt.
+-- man/roff 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('man')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Markup.
+lex:add_rule('rule1', token(lexer.STRING, '.' * ('B' * P('R')^-1 +
+                                                 'I' * P('PR')^-1) *
+                                          lexer.nonnewline^0))
+lex:add_rule('rule2', token(lexer.NUMBER, '.' * S('ST') * 'H' *
+                                          lexer.nonnewline^0))
+lex:add_rule('rule3', token(lexer.KEYWORD, P('.br') + '.DS' + '.RS' + '.RE' +
+                                           '.PD'))
+lex:add_rule('rule4', token(lexer.LABEL, '.' * (S('ST') * 'H' + '.TP')))
+lex:add_rule('rule5', token(lexer.VARIABLE, '.B' * P('R')^-1 +
+                                            '.I' * S('PR')^-1 +
+                                            '.PP'))
+lex:add_rule('rule6', token(lexer.TYPE, '\\f' * S('BIPR')))
+lex:add_rule('rule7', token(lexer.PREPROCESSOR, lexer.starts_line('.') *
+                                                lexer.alpha^1))
+
+return lex