如何为编译器编写缓冲区？
how to write buffer for compiler?
我第一次想用 C# 编写编译器，但我不知道如何处理它的缓冲！我的参考资料是 Compilers, Principles, Techniques and Tools, 它说：
Because of the amount of time taken to process characters and the
large number of characters that must be processed during the
compilation of a large source program, specialized buffering
techniques have been developed to reduce the amount of overhead
required to process a single input character.An important scheme
involves two buffers that are alternately reloaded,Each buffer is of
the same size N, and N is usually the size of a disk block,e.g., 4096
bytes. Using one system read command we can read N characters into a
buffer, rather than using one system call per character. If fewer than
N characters remain in the input file, then a special character,
represented by eof,marks the end of the source file and is different
from any possible character of the source program.
而且这本书里也说我们把eof放在每个buffer的末尾来实现我们到达buffer.and的末尾它有两个指针forward 和 lexemBegine 指向缓冲区中的词素！
我的问题是我不知道如何创建这个缓冲区？我应该在 sourceBuffer class 中创建大小为 N 的数组或缓冲区，然后如何从 StreamReader 读取文件并将源文件的 N 个字符放入数组？
如果我改为从源文件中读取字符，会出现什么问题？
你似乎引用了 1986 年的最后一版 "Compilers: Principles, Techniques, and Tools"。（但即使在那个时候引用的部分已经过时了）。
在像 C# 这样的现代编程语言中（或者更准确地说在它的 I/O 库中）这种缓冲已经实现了（以一种健壮的、经过测试的、高性能的方式）。
只需使用 StreamReader 即可完成所有这些工作。然后一个字符一个字符地阅读，直到找到一个完整的标记，然后按照这本优秀书籍中的描述处理您的标记。
我第一次想用 C# 编写编译器，但我不知道如何处理它的缓冲！我的参考资料是 Compilers, Principles, Techniques and Tools, 它说：
Because of the amount of time taken to process characters and the large number of characters that must be processed during the compilation of a large source program, specialized buffering techniques have been developed to reduce the amount of overhead required to process a single input character.An important scheme involves two buffers that are alternately reloaded,Each buffer is of the same size N, and N is usually the size of a disk block,e.g., 4096 bytes. Using one system read command we can read N characters into a buffer, rather than using one system call per character. If fewer than N characters remain in the input file, then a special character, represented by eof,marks the end of the source file and is different from any possible character of the source program.
而且这本书里也说我们把eof放在每个buffer的末尾来实现我们到达buffer.and的末尾它有两个指针forward 和 lexemBegine 指向缓冲区中的词素！ 我的问题是我不知道如何创建这个缓冲区？我应该在 sourceBuffer class 中创建大小为 N 的数组或缓冲区，然后如何从 StreamReader 读取文件并将源文件的 N 个字符放入数组？ 如果我改为从源文件中读取字符，会出现什么问题？
你似乎引用了 1986 年的最后一版 "Compilers: Principles, Techniques, and Tools"。（但即使在那个时候引用的部分已经过时了）。
在像 C# 这样的现代编程语言中（或者更准确地说在它的 I/O 库中）这种缓冲已经实现了（以一种健壮的、经过测试的、高性能的方式）。
只需使用 StreamReader 即可完成所有这些工作。然后一个字符一个字符地阅读，直到找到一个完整的标记，然后按照这本优秀书籍中的描述处理您的标记。