Import LPeg based lexers from Scintillua 3.6.1-1

These are Copyright (c) 2007-2015 Mitchell and released under the
MIT license.

1 files changed, 69 insertions, 0 deletions

diff --git a/lexers/eiffel.lua b/lexers/eiffel.lua
new file mode 100644
index 0000000..871ed8f
--- /dev/null
+++ b/lexers/eiffel.lua
@@ -0,0 +1,69 @@
+-- Copyright 2006-2015 Mitchell mitchell.att.foicica.com. See LICENSE.
+-- Eiffel LPeg lexer.
+
+local l = require('lexer')
+local token, word_match = l.token, l.word_match
+local P, R, S = lpeg.P, lpeg.R, lpeg.S
+
+local M = {_NAME = 'eiffel'}
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments.
+local comment = token(l.COMMENT, '--' * l.nonnewline^0)
+
+-- Strings.
+local sq_str = l.delimited_range("'", true)
+local dq_str = l.delimited_range('"', true)
+local string = token(l.STRING, sq_str + dq_str)
+
+-- Numbers.
+local number = token(l.NUMBER, l.float + l.integer)
+
+-- Keywords.
+local keyword = token(l.KEYWORD, word_match{
+  'alias', 'all', 'and', 'as', 'check', 'class', 'creation', 'debug',
+  'deferred', 'do', 'else', 'elseif', 'end', 'ensure', 'expanded', 'export',
+  'external', 'feature', 'from', 'frozen', 'if', 'implies', 'indexing', 'infix',
+  'inherit', 'inspect', 'invariant', 'is', 'like', 'local', 'loop', 'not',
+  'obsolete', 'old', 'once', 'or', 'prefix', 'redefine', 'rename', 'require',
+  'rescue', 'retry', 'select', 'separate', 'then', 'undefine', 'until',
+  'variant', 'when', 'xor',
+  'current', 'false', 'precursor', 'result', 'strip', 'true', 'unique', 'void'
+})
+
+-- Types.
+local type = token(l.TYPE, word_match{
+  'character', 'string', 'bit', 'boolean', 'integer', 'real', 'none', 'any'
+})
+
+-- Identifiers.
+local identifier = token(l.IDENTIFIER, l.word)
+
+-- Operators.
+local operator = token(l.OPERATOR, S('=!<>+-/*%&|^~.,:;?()[]{}'))
+
+M._rules = {
+  {'whitespace', ws},
+  {'keyword', keyword},
+  {'type', type},
+  {'identifier', identifier},
+  {'string', string},
+  {'comment', comment},
+  {'number', number},
+  {'operator', operator},
+}
+
+M._foldsymbols = {
+  _patterns = {'[a-z]+', '%-%-'},
+  [l.KEYWORD] = {
+    check = 1, debug = 1, deferred = 1, ['do'] = 1, from = 1, ['if'] = 1,
+    inspect = 1, once = 1, class = function(text, pos, line, s)
+      return line:find('deferred%s+class') and 0 or 1
+    end, ['end'] = -1
+  },
+  [l.COMMENT] = {['--'] = l.fold_line_comments('--')}
+}
+
+return M