1 files changed, 60 insertions, 0 deletions
diff --git a/lexlua/bash.lua b/lexlua/bash.lua
new file mode 100644
index 000000000..bd738e47b
--- /dev/null
+++ b/lexlua/bash.lua
@@ -0,0 +1,60 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- Shell 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('bash')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  if then elif else fi case in esac while for do done continue local return
+  select
+  -- Operators.
+  -a -b -c -d -e -f -g -h -k -p -r -s -t -u -w -x -O -G -L -S -N -nt -ot -ef -o
+  -z -n -eq -ne -lt -le -gt -ge
+]]))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Strings.
+local sq_str = lexer.delimited_range("'", false, true)
+local dq_str = lexer.delimited_range('"')
+local ex_str = lexer.delimited_range('`')
+local heredoc = '<<' * P(function(input, index)
+  local s, e, _, delimiter =
+    input:find('%-?(["\']?)([%a_][%w_]*)%1[\n\r\f;]+', index)
+  if s == index and delimiter then
+    local _, e = input:find('[\n\r\f]+'..delimiter, e)
+    return e and e + 1 or #input + 1
+  end
+end)
+lex:add_rule('string', token(lexer.STRING, sq_str + dq_str + ex_str + heredoc))
+
+-- Comments.
+lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
+
+-- Variables.
+lex:add_rule('variable', token(lexer.VARIABLE,
+                               '$' * (S('!#?*@$') + lexer.digit^1 + lexer.word +
+                                      lexer.delimited_range('{}', true, true))))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('=!<>+-/*^&|~.,:;?()[]{}')))
+
+-- Fold points.
+lex:add_fold_point(lexer.KEYWORD, 'if', 'fi')
+lex:add_fold_point(lexer.KEYWORD, 'case', 'esac')
+lex:add_fold_point(lexer.KEYWORD, 'do', 'done')
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '#', lexer.fold_line_comments('#'))
+
+return lex