-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Gnuplot 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('gnuplot')
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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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cd call clear exit fit help history if load pause plot using with index every
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smooth thru print pwd quit replot reread reset save set show unset shell splot
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system test unset update
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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 acos acosh arg asin asinh atan atan2 atanh besj0 besj1 besy0 besy1 ceil
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cos cosh erf erfc exp floor gamma ibeta inverf igamma imag invnorm int
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lambertw lgamma log log10 norm rand real sgn sin sinh sqrt tan tanh column
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defined tm_hour tm_mday tm_min tm_mon tm_sec tm_wday tm_yday tm_year valid
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]]))
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-- Variables.
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lex:add_rule('variable', token(lexer.VARIABLE, word_match[[
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angles arrow autoscale bars bmargin border boxwidth clabel clip cntrparam
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colorbox contour datafile decimalsign dgrid3d dummy encoding fit fontpath
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format functions function grid hidden3d historysize isosamples key label
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lmargin loadpath locale logscale mapping margin mouse multiplot mx2tics mxtics
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my2tics mytics mztics offsets origin output parametric plot pm3d palette
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pointsize polar print rmargin rrange samples size style surface terminal tics
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ticslevel ticscale timestamp timefmt title tmargin trange urange variables
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version view vrange x2data x2dtics x2label x2mtics x2range x2tics x2zeroaxis
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xdata xdtics xlabel xmtics xrange xtics xzeroaxis y2data y2dtics y2label
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y2mtics y2range y2tics y2zeroaxis ydata ydtics ylabel ymtics yrange ytics
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yzeroaxis zdata zdtics cbdata cbdtics zero zeroaxis zlabel zmtics zrange ztics
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cblabel cbmtics cbrange cbtics
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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("'") +
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lexer.delimited_range('"') +
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lexer.delimited_range('[]', true) +
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lexer.delimited_range('{}', true)))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
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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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