Files
openGauss-server/src/bin/pg_probackup/json.cpp
dengxuyue 1567043064 同步source code
日期: 12-26
    revision: ee5b054c
2020-12-28 22:19:21 +08:00

148 lines
3.6 KiB
C++

/*-------------------------------------------------------------------------
*
* json.c: - make json document.
*
* Copyright (c) 2018-2019, Postgres Professional
*
*-------------------------------------------------------------------------
*/
#include "json.h"
static void json_add_indent(PQExpBuffer buf, int32 level);
static void json_add_escaped(PQExpBuffer buf, const char *str);
static bool add_comma = false;
/*
* Start or end json token. Currently it is a json object or array.
*
* Function modifies level value and adds indent if it appropriate.
*/
void
json_add(PQExpBuffer buf, JsonToken type, int32 *level)
{
switch (type)
{
case JT_BEGIN_ARRAY:
appendPQExpBufferChar(buf, '[');
*level += 1;
add_comma = false;
break;
case JT_END_ARRAY:
*level -= 1;
if (*level == 0)
appendPQExpBufferChar(buf, '\n');
else
json_add_indent(buf, *level);
appendPQExpBufferChar(buf, ']');
add_comma = true;
break;
case JT_BEGIN_OBJECT:
json_add_indent(buf, *level);
appendPQExpBufferChar(buf, '{');
*level += 1;
add_comma = false;
break;
case JT_END_OBJECT:
*level -= 1;
if (*level == 0)
appendPQExpBufferChar(buf, '\n');
else
json_add_indent(buf, *level);
appendPQExpBufferChar(buf, '}');
add_comma = true;
break;
default:
break;
}
}
/*
* Add json object's key. If it isn't first key we need to add a comma.
*/
void
json_add_key(PQExpBuffer buf, const char *name, int32 level)
{
if (add_comma)
appendPQExpBufferChar(buf, ',');
json_add_indent(buf, level);
json_add_escaped(buf, name);
appendPQExpBufferStr(buf, ": ");
add_comma = true;
}
/*
* Add json object's key and value. If it isn't first key we need to add a
* comma.
*/
void
json_add_value(PQExpBuffer buf, const char *name, const char *value,
int32 level, bool escaped)
{
json_add_key(buf, name, level);
if (escaped)
json_add_escaped(buf, value);
else
appendPQExpBufferStr(buf, value);
}
static void
json_add_indent(PQExpBuffer buf, int32 level)
{
uint16 i;
if (level == 0)
return;
appendPQExpBufferChar(buf, '\n');
for (i = 0; i < level; i++)
appendPQExpBufferStr(buf, " ");
}
static void
json_add_escaped(PQExpBuffer buf, const char *str)
{
const char *p;
appendPQExpBufferChar(buf, '"');
for (p = str; *p; p++)
{
switch (*p)
{
case '\b':
appendPQExpBufferStr(buf, "\\b");
break;
case '\f':
appendPQExpBufferStr(buf, "\\f");
break;
case '\n':
appendPQExpBufferStr(buf, "\\n");
break;
case '\r':
appendPQExpBufferStr(buf, "\\r");
break;
case '\t':
appendPQExpBufferStr(buf, "\\t");
break;
case '"':
appendPQExpBufferStr(buf, "\\\"");
break;
case '\\':
appendPQExpBufferStr(buf, "\\\\");
break;
default:
if ((unsigned char) *p < ' ')
appendPQExpBuffer(buf, "\\u%04x", (int) *p);
else
appendPQExpBufferChar(buf, *p);
break;
}
}
appendPQExpBufferChar(buf, '"');
}