1 files changed, 68 insertions, 0 deletions
diff --git a/lexlua/rust.lua b/lexlua/rust.lua
new file mode 100644
index 000000000..16172620f
--- /dev/null
+++ b/lexlua/rust.lua
@@ -0,0 +1,68 @@
+-- Copyright 2015-2018 Alejandro Baez (https://keybase.io/baez). See License.txt.
+-- Rust 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('rust')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  abstract alignof as become box break const continue crate do else enum extern
+  false final fn for if impl in let loop macro match mod move mut offsetof
+  override priv proc pub pure ref return Self self sizeof static struct super
+  trait true type typeof unsafe unsized use virtual where while yield
+]]))
+
+-- Functions.
+lex:add_rule('function', token(lexer.FUNCTION, lexer.word^1 * S("!")))
+
+-- Library types
+lex:add_rule('library', token(lexer.LABEL, lexer.upper *
+                                           (lexer.lower + lexer.dec_num)^1))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match[[
+ () bool isize usize char str u8 u16 u32 u64 i8 i16 i32 i64 f32 f64
+]]))
+
+-- Strings.
+local sq_str = P('L')^-1 * lexer.delimited_range("'")
+local dq_str = P('L')^-1 * lexer.delimited_range('"')
+local raw_str = '#"' * (lexer.any - '#')^0 * P('#')^-1
+lex:add_rule('string', token(lexer.STRING, dq_str + raw_str))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Comments.
+local line_comment = '//' * lexer.nonnewline_esc^0
+local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
+lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER,
+                             lexer.float +
+                             P('0b')^-1 * (lexer.dec_num + "_")^1 +
+                             lexer.integer))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR,
+                               S('+-/*%<>!=`^~@&|?#~:;,.()[]{}')))
+
+-- Attributes.
+lex:add_rule('preprocessor', token(lexer.PREPROCESSOR,
+                                   "#[" * (lexer.nonnewline - ']')^0 *
+                                   P("]")^-1))
+
+-- Fold points.
+lex:add_fold_point(lexer.COMMENT, '/*', '*/')
+lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
+lex:add_fold_point(lexer.OPERATOR, '(', ')')
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+
+return lex