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"""
pygments.lexers.snobol
~~~~~~~~~~~~~~~~~~~~~~
Lexers for the SNOBOL language.
:copyright: Copyright 2006-2024 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.
"""
name = "Snobol"
aliases = ["snobol"]
filenames = ['*.snobol']
mimetypes = ['text/x-snobol']
url = 'https://www.regressive.org/snobol4'
version_added = '1.5'
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)
]
}
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