-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Rexx 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('rexx')
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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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address arg by call class do drop else end exit expose forever forward guard
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if interpret iterate leave method nop numeric otherwise parse procedure pull
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push queue raise reply requires return routine result rc say select self sigl
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signal super then to trace use when while until
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]], true)))
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-- Functions.
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lex:add_rule('function', token(lexer.FUNCTION, word_match([[
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abbrev abs address arg beep bitand bitor bitxor b2x center changestr charin
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charout chars compare consition copies countstr c2d c2x datatype date delstr
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delword digits directory d2c d2x errortext filespec form format fuzz insert
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lastpos left length linein lineout lines max min overlay pos queued random
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reverse right sign sourceline space stream strip substr subword symbol time
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trace translate trunc value var verify word wordindex wordlength wordpos words
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xrange x2b x2c x2d
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rxfuncadd rxfuncdrop rxfuncquery rxmessagebox rxwinexec
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sysaddrexxmacro sysbootdrive sysclearrexxmacrospace syscloseeventsem
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sysclosemutexsem syscls syscreateeventsem syscreatemutexsem syscurpos
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syscurstate sysdriveinfo sysdrivemap sysdropfuncs sysdroprexxmacro
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sysdumpvariables sysfiledelete sysfilesearch sysfilesystemtype sysfiletree
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sysfromunicode systounicode sysgeterrortext sysgetfiledatetime sysgetkey
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sysini sysloadfuncs sysloadrexxmacrospace sysmkdir sysopeneventsem
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sysopenmutexsem sysposteventsem syspulseeventsem sysqueryprocess
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sysqueryrexxmacro sysreleasemutexsem sysreorderrexxmacro sysrequestmutexsem
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sysreseteventsem sysrmdir syssaverexxmacrospace syssearchpath
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syssetfiledatetime syssetpriority syssleep sysstemcopy sysstemdelete
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syssteminsert sysstemsort sysswitchsession syssystemdirectory systempfilename
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systextscreenread systextscreensize sysutilversion sysversion sysvolumelabel
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syswaiteventsem syswaitnamedpipe syswindecryptfile syswinencryptfile syswinver
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]], true)))
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-- Identifiers.
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local word = lexer.alpha * (lexer.alnum + S('@#$\\.!?_'))^0
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lex:add_rule('identifier', token(lexer.IDENTIFIER, word))
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-- Strings.
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local sq_str = lexer.delimited_range("'", true, true)
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local dq_str = lexer.delimited_range('"', true, true)
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
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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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-- Preprocessor.
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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.KEYWORD, 'do', 'end')
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lex:add_fold_point(lexer.KEYWORD, 'select', 'return')
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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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--lex:add_fold_point(lexer.OPERATOR, ':', ?)
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return lex
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