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83 lines
2.7 KiB
Python
83 lines
2.7 KiB
Python
"""
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pygments.lexers.snobol
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~~~~~~~~~~~~~~~~~~~~~~
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Lexers for the SNOBOL language.
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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, bygroups
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from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
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Number, Punctuation
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__all__ = ['SnobolLexer']
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class SnobolLexer(RegexLexer):
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"""
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Lexer for the SNOBOL4 programming language.
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Recognizes the common ASCII equivalents of the original SNOBOL4 operators.
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Does not require spaces around binary operators.
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.. versionadded:: 1.5
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"""
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name = "Snobol"
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aliases = ["snobol"]
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filenames = ['*.snobol']
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mimetypes = ['text/x-snobol']
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tokens = {
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# root state, start of line
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# comments, continuation lines, and directives start in column 1
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# as do labels
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'root': [
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(r'\*.*\n', Comment),
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(r'[+.] ', Punctuation, 'statement'),
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(r'-.*\n', Comment),
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(r'END\s*\n', Name.Label, 'heredoc'),
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(r'[A-Za-z$][\w$]*', Name.Label, 'statement'),
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(r'\s+', Text, 'statement'),
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],
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# statement state, line after continuation or label
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'statement': [
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(r'\s*\n', Text, '#pop'),
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(r'\s+', Text),
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(r'(?<=[^\w.])(LT|LE|EQ|NE|GE|GT|INTEGER|IDENT|DIFFER|LGT|SIZE|'
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r'REPLACE|TRIM|DUPL|REMDR|DATE|TIME|EVAL|APPLY|OPSYN|LOAD|UNLOAD|'
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r'LEN|SPAN|BREAK|ANY|NOTANY|TAB|RTAB|REM|POS|RPOS|FAIL|FENCE|'
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r'ABORT|ARB|ARBNO|BAL|SUCCEED|INPUT|OUTPUT|TERMINAL)(?=[^\w.])',
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Name.Builtin),
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(r'[A-Za-z][\w.]*', Name),
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# ASCII equivalents of original operators
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# | for the EBCDIC equivalent, ! likewise
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# \ for EBCDIC negation
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(r'\*\*|[?$.!%*/#+\-@|&\\=]', Operator),
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(r'"[^"]*"', String),
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(r"'[^']*'", String),
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# Accept SPITBOL syntax for real numbers
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# as well as Macro SNOBOL4
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(r'[0-9]+(?=[^.EeDd])', Number.Integer),
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(r'[0-9]+(\.[0-9]*)?([EDed][-+]?[0-9]+)?', Number.Float),
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# Goto
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(r':', Punctuation, 'goto'),
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(r'[()<>,;]', Punctuation),
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],
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# Goto block
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'goto': [
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(r'\s*\n', Text, "#pop:2"),
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(r'\s+', Text),
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(r'F|S', Keyword),
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(r'(\()([A-Za-z][\w.]*)(\))',
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bygroups(Punctuation, Name.Label, Punctuation))
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],
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# everything after the END statement is basically one
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# big heredoc.
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'heredoc': [
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(r'.*\n', String.Heredoc)
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]
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}
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