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language.py
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language.py
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import json
import re
import functools
class Symbol:
def __init__(self, type, word):
self.type = type
self.word = word
def __len__(self):
return len(self.word)
@property
def is_token(self):
return self.type != 'spaces'
class SymbolBuilder:
@staticmethod
def operators(word):
return Symbol('operators', word)
@staticmethod
def bounds(word):
return Symbol('bounds', word)
@staticmethod
def spaces(word):
return Symbol('spaces', word)
class Token:
def __init__(self, line, index, type, word):
self.line = line
self.index = index
self.type = type
self.word = word
def __str__(self):
return f'<{self.line}, {self.index}, {self.type}, {self.word}>'
class TokenBuilder:
@staticmethod
def symbol(location, symbol):
return Token(location[0], location[1], symbol.type, symbol.word)
@staticmethod
def default(location, type, word):
return Token(location[0], location[1], type, word)
class Error:
def __init__(self, line, index, message):
self.line = line
self.index = index
self.message = message
def __str__(self):
return f'Error at line: {self.line} column: {self.index} {self.message}'
class ErrorBuilder:
@staticmethod
def unexpected(location):
return Error(location[0], location[1], 'unexpected symbols')
@staticmethod
def invalid(location, type):
return Error(location[0], location[1], f'invalid {type}')
class TransformElement:
def __init__(self, last, char, next):
self.last = last
self.char = char
self.next = next
class AutomataGrammar:
def __init__(self, formulas, alias, start, final):
self.formulas = formulas
self.alias = alias
self.start = start
self.final = final
def parse_formulas(self):
for formula in self.formulas:
if match := re.match(r'(.+?) -> `(.+?)` (.+)', formula):
last = match.group(1)
name = match.group(2)
next = match.group(3)
for char in self.alias[name]:
yield TransformElement(last, char, next)
elif match := re.match(r'(.+?) -> `(.+?)`', formula):
last = match.group(1)
name = match.group(2)
for char in self.alias[name]:
yield TransformElement(last, char, self.final)
elif match := re.match(r'(.+?) -> (.) (.+)', formula):
last = match.group(1)
char = match.group(2)
next = match.group(3)
yield TransformElement(last, char, next)
elif match := re.match(r'(.+?) -> (.)', formula):
last = match.group(1)
char = match.group(2)
yield TransformElement(last, char, self.final)
class SymbolGrammar:
def __init__(self, keywords, operators, bounds, spaces, constants_specials):
self.keywords = keywords
self.operators = operators
self.bounds = bounds
self.spaces = spaces
self.constants_specials = constants_specials
class GrammarLoader:
@staticmethod
@functools.cache
def config():
with open('grammars/grammar.json', mode='r', encoding='utf-8') as grammar_json:
return json.load(grammar_json)
@staticmethod
def constants():
config = GrammarLoader.config()
return AutomataGrammar(
config['constants']['formulas'],
config['alias'],
config['constants']['start'],
config['constants']['final'],
)
@staticmethod
def identifiers():
config = GrammarLoader.config()
return AutomataGrammar(
config['identifiers']['formulas'],
config['alias'],
config['identifiers']['start'],
config['identifiers']['final'],
)
@staticmethod
def symbols():
config = GrammarLoader.config()
return SymbolGrammar(
config['keywords'],
config['operators'],
config['bounds'],
config['spaces'],
config['constants']['specials'],
)