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+"""
+ pygments.lexers.snobol
+ ~~~~~~~~~~~~~~~~~~~~~~
+
+ Lexers for the SNOBOL language.
+
+ :copyright: Copyright 2006-2023 by the Pygments team, see AUTHORS.
+ :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, bygroups
+from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
+ Number, Punctuation
+
+__all__ = ['SnobolLexer']
+
+
+class SnobolLexer(RegexLexer):
+ """
+ Lexer for the SNOBOL4 programming language.
+
+ Recognizes the common ASCII equivalents of the original SNOBOL4 operators.
+ Does not require spaces around binary operators.
+
+ .. versionadded:: 1.5
+ """
+
+ name = "Snobol"
+ aliases = ["snobol"]
+ filenames = ['*.snobol']
+ mimetypes = ['text/x-snobol']
+
+ tokens = {
+ # root state, start of line
+ # comments, continuation lines, and directives start in column 1
+ # as do labels
+ 'root': [
+ (r'\*.*\n', Comment),
+ (r'[+.] ', Punctuation, 'statement'),
+ (r'-.*\n', Comment),
+ (r'END\s*\n', Name.Label, 'heredoc'),
+ (r'[A-Za-z$][\w$]*', Name.Label, 'statement'),
+ (r'\s+', Text, 'statement'),
+ ],
+ # statement state, line after continuation or label
+ 'statement': [
+ (r'\s*\n', Text, '#pop'),
+ (r'\s+', Text),
+ (r'(?<=[^\w.])(LT|LE|EQ|NE|GE|GT|INTEGER|IDENT|DIFFER|LGT|SIZE|'
+ r'REPLACE|TRIM|DUPL|REMDR|DATE|TIME|EVAL|APPLY|OPSYN|LOAD|UNLOAD|'
+ r'LEN|SPAN|BREAK|ANY|NOTANY|TAB|RTAB|REM|POS|RPOS|FAIL|FENCE|'
+ r'ABORT|ARB|ARBNO|BAL|SUCCEED|INPUT|OUTPUT|TERMINAL)(?=[^\w.])',
+ Name.Builtin),
+ (r'[A-Za-z][\w.]*', Name),
+ # ASCII equivalents of original operators
+ # | for the EBCDIC equivalent, ! likewise
+ # \ for EBCDIC negation
+ (r'\*\*|[?$.!%*/#+\-@|&\\=]', Operator),
+ (r'"[^"]*"', String),
+ (r"'[^']*'", String),
+ # Accept SPITBOL syntax for real numbers
+ # as well as Macro SNOBOL4
+ (r'[0-9]+(?=[^.EeDd])', Number.Integer),
+ (r'[0-9]+(\.[0-9]*)?([EDed][-+]?[0-9]+)?', Number.Float),
+ # Goto
+ (r':', Punctuation, 'goto'),
+ (r'[()<>,;]', Punctuation),
+ ],
+ # Goto block
+ 'goto': [
+ (r'\s*\n', Text, "#pop:2"),
+ (r'\s+', Text),
+ (r'F|S', Keyword),
+ (r'(\()([A-Za-z][\w.]*)(\))',
+ bygroups(Punctuation, Name.Label, Punctuation))
+ ],
+ # everything after the END statement is basically one
+ # big heredoc.
+ 'heredoc': [
+ (r'.*\n', String.Heredoc)
+ ]
+ }