68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
import sys
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from .io_buffer import IOBuffer
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class StandardIOBuffer(IOBuffer):
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"""
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IOBuffer implementation that uses system standard input/output.
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This class provides direct access to stdin/stdout for IO operations.
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It implements a basic line-based input buffer to handle cases where
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multiple reads are needed to process all available input.
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"""
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def __init__(self):
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"""Initialize the standard IO buffer."""
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self._input_buffer: str = ""
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def read(self) -> str:
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"""
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Read available input from stdin.
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If there is buffered input from a previous read, return that first.
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Otherwise, try to read new input from stdin if available.
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Returns:
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str: Content read from stdin, or empty string if no input available
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"""
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# Return and clear any existing buffered input
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if self._input_buffer:
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content = self._input_buffer
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self._input_buffer = ""
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return content
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# Check if there's input available
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if not sys.stdin.isatty() and sys.stdin.readable():
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try:
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content = sys.stdin.read()
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if content:
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return content
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except Exception:
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pass # Ignore any read errors
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return ""
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def write(self, content: str) -> None:
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"""
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Write content to stdout.
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Args:
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content: String content to write
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"""
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if not content:
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return
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try:
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sys.stdout.write(content)
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sys.stdout.flush()
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except Exception:
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pass # Ignore write errors
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def buffer_length(self) -> int:
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"""
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Get the current length of buffered input.
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Returns:
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int: Number of characters in the input buffer
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"""
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return len(self._input_buffer) |