-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- IDL 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('idl')
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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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abstract attribute case const context custom default enum exception factory
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FALSE in inout interface local module native oneway out private public raises
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readonly struct support switch TRUE truncatable typedef union valuetype
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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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any boolean char double fixed float long Object octet sequence short string
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unsigned ValueBase void wchar wstring
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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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local line_comment = '//' * lexer.nonnewline_esc^0
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local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
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lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
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-- Preprocessor.
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local preproc_word = word_match[[
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define undef ifdef ifndef if elif else endif include warning pragma
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]]
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lex:add_rule('preproc', token(lexer.PREPROCESSOR, lexer.starts_line('#') *
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preproc_word))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('!<>=+-/*%&|^~.,:;?()[]{}')))
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return lex
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