61 lines
2.1 KiB
Lua
Executable File
61 lines
2.1 KiB
Lua
Executable File
-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Eiffel LPeg lexer.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('eiffel')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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alias all and as check class creation debug deferred do else elseif end ensure
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expanded export external feature from frozen if implies indexing infix inherit
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inspect invariant is like local loop not obsolete old once or prefix redefine
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rename require rescue retry select separate then undefine until variant when
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xor
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current false precursor result strip true unique void
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]]))
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-- Types.
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lex:add_rule('type', token(lexer.TYPE, word_match[[
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character string bit boolean integer real none any
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]]))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Strings.
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lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'", true) +
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lexer.delimited_range('"', true)))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '--' * lexer.nonnewline^0))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('=!<>+-/*%&|^~.,:;?()[]{}')))
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-- Fold points.
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lex:add_fold_point(lexer.KEYWORD, 'check', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'debug', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'deferred', function(text, pos, line, s)
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return line:find('deferred%s+class') and 0 or 1
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end)
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lex:add_fold_point(lexer.KEYWORD, 'do', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'from', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'if', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'inspect', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'once', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'class', function(text, pos, line, s)
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return line:find('deferred%s+class') and 0 or 1
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end)
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lex:add_fold_point(lexer.COMMENT, '--', lexer.fold_line_comments('--'))
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return lex
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