69 lines
2.5 KiB
Lua
69 lines
2.5 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- C# 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('csharp')
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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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class delegate enum event interface namespace struct using abstract const
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explicit extern fixed implicit internal lock out override params partial
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private protected public ref sealed static readonly unsafe virtual volatile
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add as assembly base break case catch checked continue default do else finally
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for foreach get goto if in is new remove return set sizeof stackalloc super
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switch this throw try typeof unchecked value var void while yield
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null true false
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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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bool byte char decimal double float int long object operator sbyte short
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string uint ulong ushort
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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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-- 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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-- Strings.
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local sq_str = lexer.delimited_range("'", true)
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local dq_str = lexer.delimited_range('"', true)
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local ml_str = P('@')^-1 * lexer.delimited_range('"', false, true)
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str + ml_str))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
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S('lLdDfFMm')^-1))
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-- Preprocessor.
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local preproc_word = word_match[[
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define elif else endif error if line undef warning region endregion
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]]
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lex:add_rule('preprocessor', token(lexer.PREPROCESSOR, lexer.starts_line('#') *
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S('\t ')^0 *
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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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-- Fold points.
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lex:add_fold_point(lexer.PREPROCESSOR, 'if', 'endif')
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lex:add_fold_point(lexer.PREPROCESSOR, 'ifdef', 'endif')
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lex:add_fold_point(lexer.PREPROCESSOR, 'ifndef', 'endif')
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lex:add_fold_point(lexer.PREPROCESSOR, 'region', 'endregion')
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lex:add_fold_point(lexer.OPERATOR, '{', '}')
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lex:add_fold_point(lexer.COMMENT, '/*', '*/')
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lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
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return lex
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