65 lines
2.3 KiB
Lua
65 lines
2.3 KiB
Lua
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-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Boo 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('boo')
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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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and break cast continue elif else ensure except for given goto if in isa is
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not or otherwise pass raise ref try unless when while
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-- Definitions.
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abstract callable class constructor def destructor do enum event final get
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interface internal of override partial private protected public return set
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static struct transient virtual yield
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-- Namespaces.
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as from import namespace
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-- Other.
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self super 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 date decimal double duck float int long object operator regex
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sbyte short single string timespan uint ulong ushort
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]]))
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-- Functions.
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lex:add_rule('function', token(lexer.FUNCTION, word_match[[
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array assert checked enumerate __eval__ filter getter len lock map matrix max
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min normalArrayIndexing print property range rawArrayIndexing required
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__switch__ typeof unchecked using yieldAll zip
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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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local sq_str = lexer.delimited_range("'", true)
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local dq_str = lexer.delimited_range('"', true)
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local triple_dq_str = '"""' * (lexer.any - '"""')^0 * P('"""')^-1
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local regex_str = #P('/') * lexer.last_char_includes('!%^&*([{-=+|:;,?<>~') *
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lexer.delimited_range('/', true)
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lex:add_rule('string', token(lexer.STRING, triple_dq_str + sq_str + dq_str) +
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token(lexer.REGEX, regex_str))
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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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(S('msdhsfFlL') + 'ms')^-1))
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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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