fix(ast): 规范AST输出
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@@ -10,10 +10,11 @@ void PrintHelp(std::ostream& os) {
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os << "SysY Compiler (课程实验最小可运行示例)\n"
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<< "\n"
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<< "用法:\n"
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<< " compiler [--help] <input.sy>\n"
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<< " compiler [--help] [--ast-dot <file.dot>] <input.sy>\n"
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<< "\n"
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<< "选项:\n"
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<< " -h, --help 打印帮助信息并退出\n"
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<< " --ast-dot <path> 导出 AST Graphviz DOT 到指定文件\n"
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<< "\n"
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<< "说明:\n"
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<< " - 当前默认将 IR 输出到标准输出,可使用重定向写入文件:\n"
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