-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Pike 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('pike')
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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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break case catch continue default do else for foreach gauge if lambda return
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sscanf switch while import inherit
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-- Type modifiers.
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constant extern final inline local nomask optional private protected public
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static variant
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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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array class float function int mapping mixed multiset object program string
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void
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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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'#' * lexer.delimited_range('"')))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '//' * lexer.nonnewline_esc^0 +
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lexer.nested_pair('/*', '*/')))
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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('lLdDfF')^-1))
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-- Preprocessors.
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lex:add_rule('preprocessor', token(lexer.PREPROCESSOR, lexer.starts_line('#') *
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lexer.nonnewline^0))
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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.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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