-- Copyright 2010-2018 Jeff Stone. See License.txt.
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-- Inform LPeg lexer for Scintilla.
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-- JMS 2010-04-25.
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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('inform')
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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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Abbreviate Array Attribute Class Constant Default End Endif Extend Global
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Ifdef Iffalse Ifndef Ifnot Iftrue Import Include Link Lowstring Message Object
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Property Release Replace Serial StartDaemon Statusline StopDaemon Switches
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Verb
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absent action actor add_to_scope address additive after and animate article
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articles before bold box break cant_go capacity char class child children
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clothing concealed container continue creature daemon deadflag default
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describe description do door door_dir door_to d_to d_obj e_to e_obj each_turn
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edible else enterable false female first font for found_in general give
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grammar has hasnt held if in in_to in_obj initial inside_description invent
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jump last life light list_together location lockable locked male move moved
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multi multiexcept multiheld multiinside n_to n_obj ne_to ne_obj nw_to nw_obj
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name neuter new_line nothing notin noun number objectloop ofclass off on only
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open openable or orders out_to out_obj parent parse_name player plural
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pluralname print print_ret private proper provides random react_after
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react_before remove replace return reverse rfalseroman rtrue s_to s_obj se_to
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se_obj sw_to sw_obj scenery scope score scored second self short_name
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short_name_indef sibling spaces static string style supporter switch
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switchable talkable thedark time_left time_out to topic transparent true
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underline u_to u_obj visited w_to w_obj when_closed when_off when_on when_open
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while with with_key workflag worn
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]]))
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-- Library actions.
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lex:add_rule('action', token('action', word_match[[
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Answer Ask AskFor Attack Blow Burn Buy Climb Close Consult Cut Dig Disrobe
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Drink Drop Eat Empty EmptyT Enter Examine Exit Fill FullScore GetOff Give Go
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GoIn Insert Inv InvTall InvWide Jump JumpOver Kiss LetGo Listen LMode1 LMode2
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LMode3 Lock Look LookUnder Mild No NotifyOff NotifyOn Objects Open Order
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Places Pray Pronouns Pull Push PushDir PutOn Quit Receive Remove Restart
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Restore Rub Save Score ScriptOff ScriptOn Search Set SetTo Show Sing Sleep
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Smell Sorry Squeeze Strong Swim Swing SwitchOff SwitchOn Take Taste Tell Think
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ThrowAt ThrownAt Tie Touch Transfer Turn Unlock VagueGo Verify Version Wait
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Wake WakeOther Wave WaveHands Wear Yes
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]]))
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lex:add_style('action', lexer.STYLE_VARIABLE)
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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("'") +
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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^0))
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-- Numbers.
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local inform_hex = '$' * lexer.xdigit^1
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local inform_bin = '$$' * S('01')^1
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lex:add_rule('number', token(lexer.NUMBER, lexer.integer + inform_hex +
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inform_bin))
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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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