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__init__.py
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algebra.py
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automation.py
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clean.py
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configs.py
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console.py
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data.py
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dax.py
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devicetree.py
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elm.py
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email.py
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erlang.py
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factor.py
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fantom.py
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func.py
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functional.py
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futhark.py
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go.py
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graph.py
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graphics.py
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Editing: tnt.py
Close
""" pygments.lexers.tnt ~~~~~~~~~~~~~~~~~~~ Lexer for Typographic Number Theory. :copyright: Copyright 2006-2024 by the Pygments team, see AUTHORS. :license: BSD, see LICENSE for details. """ import re from pygments.lexer import Lexer from pygments.token import Text, Comment, Operator, Keyword, Name, Number, \ Punctuation, Error __all__ = ['TNTLexer'] class TNTLexer(Lexer): """ Lexer for Typographic Number Theory, as described in the book GΓΆdel, Escher, Bach, by Douglas R. Hofstadter """ name = 'Typographic Number Theory' url = 'https://github.com/Kenny2github/language-tnt' aliases = ['tnt'] filenames = ['*.tnt'] version_added = '2.7' cur = [] LOGIC = set('ββ]&β§^|β¨Vv') OPERATORS = set('+.β *') VARIABLES = set('abcde') PRIMES = set("'β²") NEGATORS = set('~!') QUANTIFIERS = set('AEββ') NUMBERS = set('0123456789') WHITESPACE = set('\t \v\n') RULES = re.compile('''(?xi) joining | separation | double-tilde | fantasy\\ rule | carry[- ]over(?:\\ of)?(?:\\ line)?\\ ([0-9]+) | detachment | contrapositive | De\\ Morgan | switcheroo | specification | generalization | interchange | existence | symmetry | transitivity | add\\ S | drop\\ S | induction | axiom\\ ([1-5]) | premise | push | pop ''') LINENOS = re.compile(r'(?:[0-9]+)(?:(?:, ?|,? and )(?:[0-9]+))*') COMMENT = re.compile(r'\[[^\n\]]+\]') def __init__(self, *args, **kwargs): Lexer.__init__(self, *args, **kwargs) self.cur = [] def whitespace(self, start, text, required=False): """Tokenize whitespace.""" end = start try: while text[end] in self.WHITESPACE: end += 1 except IndexError: end = len(text) if required and end == start: raise AssertionError if end != start: self.cur.append((start, Text, text[start:end])) return end def variable(self, start, text): """Tokenize a variable.""" if text[start] not in self.VARIABLES: raise AssertionError end = start+1 while text[end] in self.PRIMES: end += 1 self.cur.append((start, Name.Variable, text[start:end])) return end def term(self, start, text): """Tokenize a term.""" if text[start] == 'S': # S...S(...) or S...0 end = start+1 while text[end] == 'S': end += 1 self.cur.append((start, Number.Integer, text[start:end])) return self.term(end, text) if text[start] == '0': # the singleton 0 self.cur.append((start, Number.Integer, text[start])) return start+1 if text[start] in self.VARIABLES: # a''... return self.variable(start, text) if text[start] == '(': # (...+...) self.cur.append((start, Punctuation, text[start])) start = self.term(start+1, text) if text[start] not in self.OPERATORS: raise AssertionError self.cur.append((start, Operator, text[start])) start = self.term(start+1, text) if text[start] != ')': raise AssertionError self.cur.append((start, Punctuation, text[start])) return start+1 raise AssertionError # no matches def formula(self, start, text): """Tokenize a formula.""" if text[start] in self.NEGATORS: # ~<...> end = start+1 while text[end] in self.NEGATORS: end += 1 self.cur.append((start, Operator, text[start:end])) return self.formula(end, text) if text[start] in self.QUANTIFIERS: # Aa:<...> self.cur.append((start, Keyword.Declaration, text[start])) start = self.variable(start+1, text) if text[start] != ':': raise AssertionError self.cur.append((start, Punctuation, text[start])) return self.formula(start+1, text) if text[start] == '<': # <...&...> self.cur.append((start, Punctuation, text[start])) start = self.formula(start+1, text) if text[start] not in self.LOGIC: raise AssertionError self.cur.append((start, Operator, text[start])) start = self.formula(start+1, text) if text[start] != '>': raise AssertionError self.cur.append((start, Punctuation, text[start])) return start+1 # ...=... start = self.term(start, text) if text[start] != '=': raise AssertionError self.cur.append((start, Operator, text[start])) start = self.term(start+1, text) return start def rule(self, start, text): """Tokenize a rule.""" match = self.RULES.match(text, start) if match is None: raise AssertionError groups = sorted(match.regs[1:]) # exclude whole match for group in groups: if group[0] >= 0: # this group matched self.cur.append((start, Keyword, text[start:group[0]])) self.cur.append((group[0], Number.Integer, text[group[0]:group[1]])) if group[1] != match.end(): self.cur.append((group[1], Keyword, text[group[1]:match.end()])) break else: self.cur.append((start, Keyword, text[start:match.end()])) return match.end() def lineno(self, start, text): """Tokenize a line referral.""" end = start while text[end] not in self.NUMBERS: end += 1 self.cur.append((start, Punctuation, text[start])) self.cur.append((start+1, Text, text[start+1:end])) start = end match = self.LINENOS.match(text, start) if match is None: raise AssertionError if text[match.end()] != ')': raise AssertionError self.cur.append((match.start(), Number.Integer, match.group(0))) self.cur.append((match.end(), Punctuation, text[match.end()])) return match.end() + 1 def error_till_line_end(self, start, text): """Mark everything from ``start`` to the end of the line as Error.""" end = start try: while text[end] != '\n': # there's whitespace in rules end += 1 except IndexError: end = len(text) if end != start: self.cur.append((start, Error, text[start:end])) end = self.whitespace(end, text) return end def get_tokens_unprocessed(self, text): """Returns a list of TNT tokens.""" self.cur = [] start = end = self.whitespace(0, text) while start <= end < len(text): try: # try line number while text[end] in self.NUMBERS: end += 1 if end != start: # actual number present self.cur.append((start, Number.Integer, text[start:end])) # whitespace is required after a line number orig = len(self.cur) try: start = end = self.whitespace(end, text, True) except AssertionError: del self.cur[orig:] start = end = self.error_till_line_end(end, text) continue # at this point it could be a comment match = self.COMMENT.match(text, start) if match is not None: self.cur.append((start, Comment, text[start:match.end()])) start = end = match.end() # anything after the closing bracket is invalid start = end = self.error_till_line_end(start, text) # do not attempt to process the rest continue del match if text[start] in '[]': # fantasy push or pop self.cur.append((start, Keyword, text[start])) start += 1 end += 1 else: # one formula, possibly containing subformulae orig = len(self.cur) try: start = end = self.formula(start, text) except (AssertionError, RecursionError): # not well-formed del self.cur[orig:] while text[end] not in self.WHITESPACE: end += 1 self.cur.append((start, Error, text[start:end])) start = end # skip whitespace after formula orig = len(self.cur) try: start = end = self.whitespace(end, text, True) except AssertionError: del self.cur[orig:] start = end = self.error_till_line_end(start, text) continue # rule proving this formula a theorem orig = len(self.cur) try: start = end = self.rule(start, text) except AssertionError: del self.cur[orig:] start = end = self.error_till_line_end(start, text) continue # skip whitespace after rule start = end = self.whitespace(end, text) # line marker if text[start] == '(': orig = len(self.cur) try: start = end = self.lineno(start, text) except AssertionError: del self.cur[orig:] start = end = self.error_till_line_end(start, text) continue start = end = self.whitespace(start, text) except IndexError: try: del self.cur[orig:] except NameError: pass # if orig was never defined, fine self.error_till_line_end(start, text) return self.cur