Added optional Lua lexer support.

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

1 files changed, 52 insertions, 0 deletions

diff --git a/lexlua/batch.lua b/lexlua/batch.lua
new file mode 100644
index 000000000..c81ec08d1
--- /dev/null
+++ b/lexlua/batch.lua
@@ -0,0 +1,52 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- Batch 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('batch', {case_insensitive_fold_points = true})
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match([[
+  cd chdir md mkdir cls for if echo echo. move copy ren del set call exit
+  setlocal shift endlocal pause defined exist errorlevel else in do NUL AUX PRN
+  not goto pushd popd
+]], true)))
+
+-- Functions.
+lex:add_rule('function', token(lexer.FUNCTION, word_match([[
+  APPEND ATTRIB CHKDSK CHOICE DEBUG DEFRAG DELTREE DISKCOMP DISKCOPY DOSKEY
+  DRVSPACE EMM386 EXPAND FASTOPEN FC FDISK FIND FORMAT GRAPHICS KEYB LABEL
+  LOADFIX MEM MODE MORE MOVE MSCDEX NLSFUNC POWER PRINT RD REPLACE RESTORE
+  SETVER SHARE SORT SUBST SYS TREE UNDELETE UNFORMAT VSAFE XCOPY
+]], true)))
+
+-- Comments.
+local rem = (P('REM') + 'rem') * lexer.space
+lex:add_rule('comment', token(lexer.COMMENT, (rem + '::') * lexer.nonnewline^0))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Strings.
+lex:add_rule('string', token(lexer.STRING, lexer.delimited_range('"', true)))
+
+-- Variables.
+lex:add_rule('variable', token(lexer.VARIABLE,
+                               '%' * (lexer.digit + '%' * lexer.alpha) +
+                               lexer.delimited_range('%', true, true)))
+
+-- Labels.
+lex:add_rule('label', token(lexer.LABEL, ':' * lexer.word))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('+|&!<>=')))
+
+-- Fold points.
+lex:add_fold_point(lexer.KEYWORD, 'setlocal', 'endlocal')
+
+return lex