Unquoting booleans, numbers, etc. in a JSON string
I have a method that takes a JSON string as input and "fixes" it. By that, I mean, that the JSON string comes in with all values quoted. My method un-quotes the values that shouldn't be quoted (i.e. true, false, numbers, {}, etc). The method was originally doing it by doing 4 string replaces (for the true / false, etc) and regex replace for the numbers. Kind of slow. So I re-wrote it with StringBuilder:
protected static string FixupJson(string json)
{
if (json == null)
throw new ArgumentNullException(nameof(json));
int nLen = json.Length;
StringBuilder sb = new StringBuilder(nLen);
for (int i = 0; i < nLen; i++)
{
char ch = json[i];
if (ch == ':' && json[i+1] == ' ' && json[i + 2] == '"')
{
int k = json.IndexOf('"', i + 3);
sb.Append(": ");
string g = json.Substring(i + 3, k - i - 3);
bool bQuote = true;
if (g == "true" || g == "false" || g == "null" || g == "{}")
bQuote = false;
else if (g == "NaN")
bQuote = true;
else if (Double.TryParse(g, out double d))
bQuote = false;
if (bQuote)
sb.Append('"');
sb.Append(g);
if (bQuote)
sb.Append('"');
i = k;
}
else
{
sb.Append(ch);
}
}
return sb.ToString();
}
This got me a 35% improvement, but I want to see if there is a better approach or if I can get this faster. My first StringBuilder approach, instead of appending char by char would append chunks pulled out with SubString(). That was actually a lot slower then this version.
Yes, I understand the right way to do it would be to fix it at the source :), which I do control, but the way the json gets serialized out at the source, I don't know if the value needs to be quoted until the json is fully spit out (or at least until the value is fully spit out) as a single value can be a formatted string from multiple sources (i.e. "myVal": "(this part from one place)|(this part from another place))". So "fixing it there" would mean going from a single String.Format() for the entire json to a bunch of them for each value. Right now the JSON is "pre-rendered" (once) and passed into a String.Format() to fill in the values, so by fixing it there I'd have to go to a bunch of little String.Format()'s to format each value then pass it in to the big String.Format()… so I figure this is a decent compromise.
c# performance json escaping
edited 4 mins ago
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asked 41 mins ago
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I have a method that takes a JSON string as input and "fixes" it. By that, I mean, that the JSON string comes in with all values quoted. My method un-quotes the values that shouldn't be quoted (i.e. true, false, numbers, {}, etc). The method was originally doing it by doing 4 string replaces (for the true / false, etc) and regex replace for the numbers. Kind of slow. So I re-wrote it with StringBuilder:
protected static string FixupJson(string json)
{
if (json == null)
throw new ArgumentNullException(nameof(json));
int nLen = json.Length;
StringBuilder sb = new StringBuilder(nLen);
for (int i = 0; i < nLen; i++)
{
char ch = json[i];
if (ch == ':' && json[i+1] == ' ' && json[i + 2] == '"')
{
int k = json.IndexOf('"', i + 3);
sb.Append(": ");
string g = json.Substring(i + 3, k - i - 3);
bool bQuote = true;
if (g == "true" || g == "false" || g == "null" || g == "{}")
bQuote = false;
else if (g == "NaN")
bQuote = true;
else if (Double.TryParse(g, out double d))
bQuote = false;
if (bQuote)
sb.Append('"');
sb.Append(g);
if (bQuote)
sb.Append('"');
i = k;
}
else
{
sb.Append(ch);
}
}
return sb.ToString();
}
This got me a 35% improvement, but I want to see if there is a better approach or if I can get this faster. My first StringBuilder approach, instead of appending char by char would append chunks pulled out with SubString(). That was actually a lot slower then this version.
Yes, I understand the right way to do it would be to fix it at the source :), which I do control, but the way the json gets serialized out at the source, I don't know if the value needs to be quoted until the json is fully spit out (or at least until the value is fully spit out) as a single value can be a formatted string from multiple sources (i.e. "myVal": "(this part from one place)|(this part from another place))". So "fixing it there" would mean going from a single String.Format() for the entire json to a bunch of them for each value. Right now the JSON is "pre-rendered" (once) and passed into a String.Format() to fill in the values, so by fixing it there I'd have to go to a bunch of little String.Format()'s to format each value then pass it in to the big String.Format()… so I figure this is a decent compromise.
c# performance json escaping
edited 4 mins ago
200_success
128k15151413
asked 41 mins ago
SledgeHammer
101
New contributor
SledgeHammer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a method that takes a JSON string as input and "fixes" it. By that, I mean, that the JSON string comes in with all values quoted. My method un-quotes the values that shouldn't be quoted (i.e. true, false, numbers, {}, etc). The method was originally doing it by doing 4 string replaces (for the true / false, etc) and regex replace for the numbers. Kind of slow. So I re-wrote it with StringBuilder:
protected static string FixupJson(string json)
{
if (json == null)
throw new ArgumentNullException(nameof(json));
int nLen = json.Length;
StringBuilder sb = new StringBuilder(nLen);
for (int i = 0; i < nLen; i++)
{
char ch = json[i];
if (ch == ':' && json[i+1] == ' ' && json[i + 2] == '"')
{
int k = json.IndexOf('"', i + 3);
sb.Append(": ");
string g = json.Substring(i + 3, k - i - 3);
bool bQuote = true;
if (g == "true" || g == "false" || g == "null" || g == "{}")
bQuote = false;
else if (g == "NaN")
bQuote = true;
else if (Double.TryParse(g, out double d))
bQuote = false;
if (bQuote)
sb.Append('"');
sb.Append(g);
if (bQuote)
sb.Append('"');
i = k;
}
else
{
sb.Append(ch);
}
}
return sb.ToString();
}
This got me a 35% improvement, but I want to see if there is a better approach or if I can get this faster. My first StringBuilder approach, instead of appending char by char would append chunks pulled out with SubString(). That was actually a lot slower then this version.
Yes, I understand the right way to do it would be to fix it at the source :), which I do control, but the way the json gets serialized out at the source, I don't know if the value needs to be quoted until the json is fully spit out (or at least until the value is fully spit out) as a single value can be a formatted string from multiple sources (i.e. "myVal": "(this part from one place)|(this part from another place))". So "fixing it there" would mean going from a single String.Format() for the entire json to a bunch of them for each value. Right now the JSON is "pre-rendered" (once) and passed into a String.Format() to fill in the values, so by fixing it there I'd have to go to a bunch of little String.Format()'s to format each value then pass it in to the big String.Format()… so I figure this is a decent compromise.
c# performance json escaping
edited 4 mins ago
200_success
128k15151413
asked 41 mins ago
SledgeHammer
101
New contributor
SledgeHammer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a method that takes a JSON string as input and "fixes" it. By that, I mean, that the JSON string comes in with all values quoted. My method un-quotes the values that shouldn't be quoted (i.e. true, false, numbers, {}, etc). The method was originally doing it by doing 4 string replaces (for the true / false, etc) and regex replace for the numbers. Kind of slow. So I re-wrote it with StringBuilder:
protected static string FixupJson(string json)
{
if (json == null)
throw new ArgumentNullException(nameof(json));
int nLen = json.Length;
StringBuilder sb = new StringBuilder(nLen);
for (int i = 0; i < nLen; i++)
{
char ch = json[i];
if (ch == ':' && json[i+1] == ' ' && json[i + 2] == '"')
{
int k = json.IndexOf('"', i + 3);
sb.Append(": ");
string g = json.Substring(i + 3, k - i - 3);
bool bQuote = true;
if (g == "true" || g == "false" || g == "null" || g == "{}")
bQuote = false;
else if (g == "NaN")
bQuote = true;
else if (Double.TryParse(g, out double d))
bQuote = false;
if (bQuote)
sb.Append('"');
sb.Append(g);
if (bQuote)
sb.Append('"');
i = k;
}
else
{
sb.Append(ch);
}
}
return sb.ToString();
}
This got me a 35% improvement, but I want to see if there is a better approach or if I can get this faster. My first StringBuilder approach, instead of appending char by char would append chunks pulled out with SubString(). That was actually a lot slower then this version.
Yes, I understand the right way to do it would be to fix it at the source :), which I do control, but the way the json gets serialized out at the source, I don't know if the value needs to be quoted until the json is fully spit out (or at least until the value is fully spit out) as a single value can be a formatted string from multiple sources (i.e. "myVal": "(this part from one place)|(this part from another place))". So "fixing it there" would mean going from a single String.Format() for the entire json to a bunch of them for each value. Right now the JSON is "pre-rendered" (once) and passed into a String.Format() to fill in the values, so by fixing it there I'd have to go to a bunch of little String.Format()'s to format each value then pass it in to the big String.Format()… so I figure this is a decent compromise.
c# performance json escaping
c# performance json escaping
edited 4 mins ago
200_success
128k15151413
asked 41 mins ago
SledgeHammer
101
New contributor
SledgeHammer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 mins ago
200_success
128k15151413
asked 41 mins ago
SledgeHammer
101
New contributor
SledgeHammer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 mins ago
200_success
128k15151413
edited 4 mins ago
200_success
128k15151413
edited 4 mins ago
200_success
128k15151413
128k15151413
asked 41 mins ago
SledgeHammer
101
New contributor
SledgeHammer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 41 mins ago
SledgeHammer
101
asked 41 mins ago
SledgeHammer
101
101
New contributor
SledgeHammer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
SledgeHammer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
SledgeHammer is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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