forked from NUDT-compiler/nudt-compiler-cpp
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100 lines
3.3 KiB
100 lines
3.3 KiB
#!/usr/bin/env python3
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import sys
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def read_file(filepath):
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"""读取文件内容，返回行列表"""
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try:
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with open(filepath, 'r', encoding='utf-8') as f:
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return f.readlines()
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except FileNotFoundError:
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print(f"错误：文件 '{filepath}' 不存在")
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sys.exit(1)
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def get_context(line, pos, context_len=10):
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"""获取字符上下文"""
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start = max(0, pos - context_len)
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end = min(len(line), pos + context_len + 1)
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prefix = "..." if start > 0 else ""
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suffix = "..." if end < len(line) else ""
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return prefix + line[start:end] + suffix
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def compare_files(file1, file2):
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"""比较两个文件，输出详细差异"""
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lines1 = read_file(file1)
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lines2 = read_file(file2)
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print(f"比较文件: {file1} vs {file2}")
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print("=" * 80)
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max_lines = max(len(lines1), len(lines2))
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differences = 0
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for line_num in range(max_lines):
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line1 = lines1[line_num] if line_num < len(lines1) else None
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line2 = lines2[line_num] if line_num < len(lines2) else None
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if line1 is None:
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print(f"\n[新增行] 第 {line_num + 1} 行")
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print(f" + {repr(line2)}")
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differences += 1
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continue
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if line2 is None:
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print(f"\n[删除行] 第 {line_num + 1} 行")
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print(f" - {repr(line1)}")
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differences += 1
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continue
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if line1 == line2:
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continue
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# 行内容不同，逐字符比较
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print(f"\n[差异行] 第 {line_num + 1} 行")
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max_chars = max(len(line1), len(line2))
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for char_pos in range(max_chars):
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char1 = line1[char_pos] if char_pos < len(line1) else None
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char2 = line2[char_pos] if char_pos < len(line2) else None
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if char1 == char2:
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continue
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# 找到差异字符
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context1 = get_context(line1, char_pos) if line1 else ""
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context2 = get_context(line2, char_pos) if line2 else ""
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print(f" 字符位置 {char_pos + 1}:")
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if char1 is not None:
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print(f" - {repr(char1)} | 上下文: {repr(context1)}")
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else:
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print(f" - (缺失)")
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if char2 is not None:
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print(f" + {repr(char2)} | 上下文: {repr(context2)}")
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else:
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print(f" + (缺失)")
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differences += 1
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# 跳过一些连续差异，避免输出过多
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while char_pos + 1 < max_chars:
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next_char1 = line1[char_pos + 1] if char_pos + 1 < len(line1) else None
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next_char2 = line2[char_pos + 1] if char_pos + 1 < len(line2) else None
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if next_char1 != next_char2:
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char_pos += 1
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else:
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break
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print("\n" + "=" * 80)
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print(f"比较完成，共发现 {differences} 处差异")
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def main():
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if len(sys.argv) != 3:
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print("用法: python diff.py <文件1> <文件2>")
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sys.exit(1)
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file1 = sys.argv[1]
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file2 = sys.argv[2]
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compare_files(file1, file2)
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if __name__ == "__main__":
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main() |