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"""
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pygments.lexers.apl
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~~~~~~~~~~~~~~~~~~~
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Lexers for APL.
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:copyright: Copyright 2006-2022 by the Pygments team, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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from pygments.lexer import RegexLexer
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from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
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Number, Punctuation, Whitespace
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__all__ = ['APLLexer']
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class APLLexer(RegexLexer):
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"""
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A simple APL lexer.
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.. versionadded:: 2.0
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"""
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name = 'APL'
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url = 'https://en.m.wikipedia.org/wiki/APL_(programming_language)'
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aliases = ['apl']
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filenames = [
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'*.apl', '*.aplf', '*.aplo', '*.apln',
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'*.aplc', '*.apli', '*.dyalog',
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]
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tokens = {
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'root': [
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# Whitespace
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# ==========
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(r'\s+', Whitespace),
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#
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# Comment
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# =======
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# '⍝' is traditional; '#' is supported by GNU APL and NGN (but not Dyalog)
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(r'[⍝#].*$', Comment.Single),
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#
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# Strings
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# =======
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(r'\'((\'\')|[^\'])*\'', String.Single),
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(r'"(("")|[^"])*"', String.Double), # supported by NGN APL
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#
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# Punctuation
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# ===========
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# This token type is used for diamond and parenthesis
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# but not for bracket and ; (see below)
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(r'[⋄◇()]', Punctuation),
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#
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# Array indexing
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# ==============
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# Since this token type is very important in APL, it is not included in
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# the punctuation token type but rather in the following one
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(r'[\[\];]', String.Regex),
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#
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# Distinguished names
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# ===================
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# following IBM APL2 standard
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(r'⎕[A-Za-zΔ∆⍙][A-Za-zΔ∆⍙_¯0-9]*', Name.Function),
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#
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# Labels
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# ======
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# following IBM APL2 standard
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# (r'[A-Za-zΔ∆⍙][A-Za-zΔ∆⍙_¯0-9]*:', Name.Label),
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#
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# Variables
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# =========
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# following IBM APL2 standard (with a leading _ ok for GNU APL and Dyalog)
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(r'[A-Za-zΔ∆⍙_][A-Za-zΔ∆⍙_¯0-9]*', Name.Variable),
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#
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# Numbers
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# =======
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(r'¯?(0[Xx][0-9A-Fa-f]+|[0-9]*\.?[0-9]+([Ee][+¯]?[0-9]+)?|¯|∞)'
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r'([Jj]¯?(0[Xx][0-9A-Fa-f]+|[0-9]*\.?[0-9]+([Ee][+¯]?[0-9]+)?|¯|∞))?',
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Number),
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#
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# Operators
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# ==========
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(r'[\.\\\/⌿⍀¨⍣⍨⍠⍤∘⌸&⌶@⌺⍥⍛⍢]', Name.Attribute), # closest token type
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(r'[+\-×÷⌈⌊∣|⍳?*⍟○!⌹<≤=>≥≠≡≢∊⍷∪∩~∨∧⍱⍲⍴,⍪⌽⊖⍉↑↓⊂⊃⌷⍋⍒⊤⊥⍕⍎⊣⊢⍁⍂≈⌸⍯↗⊆⊇⍸√⌾…⍮]',
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Operator),
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#
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# Constant
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# ========
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(r'⍬', Name.Constant),
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#
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# Quad symbol
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# ===========
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(r'[⎕⍞]', Name.Variable.Global),
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#
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# Arrows left/right
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# =================
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(r'[←→]', Keyword.Declaration),
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#
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# D-Fn
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# ====
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(r'[⍺⍵⍶⍹∇:]', Name.Builtin.Pseudo),
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(r'[{}]', Keyword.Type),
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],
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}
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