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74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
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from typing import Callable
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class Parser:
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"""Base class for text parser.
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This class provides method for a text parser. This can be used as an instance
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or be extended for a custom parser.
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Attributes:
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buffer: the text buffer to parse.
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offset: offset of the current parsing position within the buffer.
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"""
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buffer: str
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offset: int
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def __init__(self, buffer: str) -> None:
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self.buffer = buffer
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self.offset = 0
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def read(self, count: int = 1) -> str:
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"""Return count characters from the buffer."""
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if self.left() < count:
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return ""
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ret = self.buffer[self.offset : self.offset + count]
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self.offset += count
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return ret
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def read_while(self, f: Callable[[str], bool]) -> str:
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"""Return characters from the buffer while the current character meet a criteria."""
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offset = self.offset
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while self.left() > 0:
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c = self.peek()
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if f(c):
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_ = self.read()
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else:
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break
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return self.buffer[offset : self.offset]
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def read_while_prev(self, f: Callable[[str, str], bool]) -> str:
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"""Return characters from the buffer while the current and previous character meet a criteria."""
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offset = self.offset
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while self.left() > 0:
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c = self.peek()
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prev = self.buffer[self.offset - 1]
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if f(c, prev):
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_ = self.read()
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else:
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break
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return self.buffer[offset : self.offset]
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def peek(self, count: int = 1) -> str:
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"""Return count characters from the buffer, without modifying the parsing offset."""
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if self.left() < count:
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return ""
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return self.buffer[self.offset : self.offset + count]
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def peek_while(self, f) -> str:
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"""Return characters from the buffer while the current character meet a criteria, without modifying the
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parsing offset."""
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offset = self.offset
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while offset < len(self.buffer):
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c = self.buffer[offset]
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if f(c):
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offset += 1
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else:
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break
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return self.buffer[self.offset : offset]
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def left(self) -> int:
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"""Return the number of characters left to read."""
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return len(self.buffer) - self.offset
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