-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Erlang 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('erlang')
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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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after begin case catch cond end fun if let of query receive try when
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-- Operators.
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div rem or xor bor bxor bsl bsr and band not bnot badarg nocookie orelse
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andalso false true
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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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abs alive apply atom_to_list binary_to_list binary_to_term concat_binary date
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disconnect_node element erase exit float float_to_list get get_keys
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group_leader halt hd integer_to_list is_alive is_record length link
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list_to_atom list_to_binary list_to_float list_to_integer list_to_pid
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list_to_tuple load_module make_ref monitor_node node nodes now open_port
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pid_to_list process_flag process_info process put register registered round
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self setelement size spawn spawn_link split_binary statistics term_to_binary
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throw time tl trunc tuple_to_list unlink unregister whereis
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-- Others.
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any atom binary bitstring byte constant function integer list map mfa
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non_neg_integer number pid ports port_close port_info pos_integer reference
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record
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-- Erlang.
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check_process_code delete_module get_cookie hash math module_loaded preloaded
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processes purge_module set_cookie set_node
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-- Math.
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acos asin atan atan2 cos cosh exp log log10 min max pi pow power sin sinh sqrt
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tan tanh
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]]))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.lower *
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('_' + lexer.alnum)^0))
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-- Variables.
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lex:add_rule('variable', token(lexer.VARIABLE, P('_')^0 * lexer.upper *
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('_' + lexer.alnum)^0))
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-- Directives.
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lex:add_rule('directive', token('directive', '-' * word_match[[
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author behaviour behavior compile copyright define doc else endif export file
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ifdef ifndef import include include_lib module record spec type undef
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]]))
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lex:add_style('directive', lexer.STYLE_PREPROCESSOR)
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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('"') +
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'$' * lexer.any * lexer.alnum^0))
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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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-- Preprocessor.
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lex:add_rule('preprocessor', token(lexer.TYPE, '?' * lexer.word))
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-- Records.
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lex:add_rule('type', token(lexer.TYPE, '#' * lexer.word))
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-- Fold points.
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lex:add_fold_point(lexer.KEYWORD, 'case', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'fun', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'if', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'query', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'receive', 'end')
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lex:add_fold_point(lexer.OPERATOR, '(', ')')
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lex:add_fold_point(lexer.OPERATOR, '[', ']')
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lex:add_fold_point(lexer.OPERATOR, '{', '}')
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lex:add_fold_point(lexer.COMMENT, '%', lexer.fold_line_comments('%'))
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return lex
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