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parser.cpp
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parser.cpp
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#include <string>
#include <cstring>
#include <fstream>
#include <sstream>
#include <iostream>
#include <set>
using namespace std;
typedef bool (*char_is_match)(unsigned char x, unsigned char y);
// 仅数字
bool digital(unsigned char x, unsigned char y)
{
return x >= 48 && x <= 57;
}
// 包含数字和.号
bool digital_dot(unsigned char x, unsigned char y)
{
return (x >= 48 && x <= 57) || x == 46;
}
// 包含数字字母[a-f]和.号或:号(IPv4或IPv6)
bool digital_dot_colon(unsigned char x, unsigned char y)
{
return (x >= 48 && x <= 58) || x == 46 || (x >= 97 && x <= 102);
}
// 包含数字和.号或-号
bool digital_dot_minus(unsigned char x, unsigned char y)
{
return (x >= 48 && x <= 57) || x == 46 || x == 45;
}
// 非空格
bool not_space(unsigned char x, unsigned char y)
{
return x != 32;
}
// 当前是空格,上一个是-或者数字
bool digital_or_none_end(unsigned char x, unsigned char y)
{
return !(x == 32 && ((y >= 48 && y <= 57) || y == 45));
}
class Line
{
private:
int index;
const int len;
const char *const str;
int parse_item_trim_space(char *item_value, const char_is_match cond)
{
while (index < len && str[index] == ' ')
{
++index;
}
int found_start = -1;
int found_end = -1;
unsigned char y = (index > 0) ? str[index - 1] : 0;
while (index < len)
{
unsigned char x = str[index++];
if (cond(x, y))
{
found_end = index - 1;
if (found_start < 0)
{
found_start = found_end;
}
if (index < len)
{
y = x;
continue;
}
}
if (found_start < 0)
{
return -1;
}
// cond成立时,则包含当前字符x,否则不包含,截取的字符最少1字节
const int v_len = found_end - found_start + 1;
memcpy(item_value, str + found_start, v_len);
item_value[v_len] = '\0';
while (index < len && str[index] == ' ')
{
++index;
}
return found_start;
}
return found_start;
}
int parse_item_wrap_string(char *item_value, const char &left = '"', const char &right = '"')
{
while (index < len && str[index] == ' ')
{
++index;
}
if (index >= len || str[index] != left)
{
return -1;
}
++index;
auto p = memchr(str + index, right, len - index);
if (!p)
{
return -1;
}
const int v_len = static_cast<const char *>(p) - str - index;
memcpy(item_value, str + index, v_len);
item_value[v_len] = '\0';
index += v_len + 1;
return 1;
}
public:
Line(char const *str);
int parse_remote_addr(char *item_value)
{
return parse_item_trim_space(item_value, digital_dot_colon);
}
int parse_remote_user(char *item_value)
{
while (index < len && str[index] == '-')
{
++index;
}
return parse_item_trim_space(item_value, not_space);
}
int parse_time_local(char *item_value)
{
return parse_item_wrap_string(item_value, '[', ']');
}
int parse_request_line(char *item_value)
{
return parse_item_wrap_string(item_value);
}
int parse_status_code(char *item_value)
{
return parse_item_trim_space(item_value, digital);
}
int parse_body_bytes_sent(char *item_value)
{
return parse_item_trim_space(item_value, digital);
}
int parse_http_referer(char *item_value)
{
return parse_item_wrap_string(item_value);
}
int parse_http_user_agent(char *item_value)
{
return parse_item_wrap_string(item_value);
}
int parse_http_x_forwarded_for(char *item_value)
{
return parse_item_wrap_string(item_value);
}
int parse_host(char *item_value)
{
return parse_item_trim_space(item_value, not_space);
}
int parse_request_length(char *item_value)
{
return parse_item_trim_space(item_value, digital);
}
int parse_bytes_sent(char *item_value)
{
return parse_item_trim_space(item_value, digital);
}
int parse_upstream_addr(char *item_value)
{
return parse_item_trim_space(item_value, not_space);
}
int parse_upstream_status(char *item_value)
{
return parse_item_trim_space(item_value, digital_or_none_end);
}
int parse_request_time(char *item_value)
{
return parse_item_trim_space(item_value, digital_dot);
}
int parse_upstream_response_time(char *item_value)
{
return parse_item_trim_space(item_value, digital_dot_minus);
}
int parse_upstream_connect_time(char *item_value)
{
return parse_item_trim_space(item_value, digital_dot_minus);
}
int parse_upstream_header_time(char *item_value)
{
return parse_item_trim_space(item_value, digital_dot_minus);
}
};
Line::Line(const char *const line) : len(strlen(line)), str(line)
{
index = 0;
}