public bool Parse(
string jsonFragment,
out string jsonRemainder
)
{
jsonRemainder = StringUtils.StripLeadingJsonWhitespace(
jsonFragment
);
// First character now should be "
if (
!(
StringUtils.GetFirstCharacter(
jsonRemainder
)
== "\""
)
)
{
// If it is not, then fail (bad formatting)
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
// Remove "
jsonRemainder = StringUtils.StripFirstCharacter(
jsonRemainder
);
/*
* Find closing quotation mark
* Note that it can be escaped with a \
* so we need to check for this also
*/
bool isEscaped = false;
int i = 0;
/*
* Conditions to continue loop
* Haven't reached the end of the string
* ^ checked in while loop condition
* also
* we haven't reached a quotation mark
* or
* we have reached a quotation mark and it is escaped
* ^ these two checked in while loop body, use break statement
*/
while (i < jsonRemainder.Length)
{
if (jsonRemainder.Substring(i, 1) == "\\")
{
// When there is a slash, flip whether we are escaped
isEscaped = !isEscaped;
}
else
{
// If unescaped " , done, exit loop
if (
!isEscaped &&
jsonRemainder.Substring(i, 1) == "\""
)
{
break;
}
// If not, reset escaped count
isEscaped = false;
}
i++;
}
// If we couldn't find the closing quote
if (i == jsonRemainder.Length)
{
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
// Extract the string up to just before the "
value = jsonRemainder.Substring(0, i);
// Check all escape sequences, replace if valid
if (
!ReplaceEscaped(
value,
out value
)
)
{
// If any escape sequences were invalid
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
// Return the rest of the json string after the closing "
jsonRemainder = jsonRemainder.Substring(i + 1);
Success = true;
return(Success);
}
public bool Parse(
string jsonFragment,
out string jsonRemainder
)
{
jsonRemainder = StringUtils.StripLeadingJsonWhitespace(
jsonFragment
);
// The first character must be { for an array
if (
StringUtils.GetFirstCharacter(
jsonRemainder
) != "{"
)
{
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
// Remove the bracket character
jsonRemainder = StringUtils.StripFirstCharacter(
jsonRemainder
);
/*
* Now should have a series of json elements follow by commas
* except for the last json element which is followed by ]
*
* Conditions
* string still has some characters left in it
* we haven't reached the array closing bracket
*/
values = new Dictionary <string, IJsonElement>();
IJsonElement nextKey;
IJsonElement nextElement;
while (
(jsonRemainder.Length > 0) &&
(
StringUtils.GetFirstCharacter(
jsonRemainder
) != "}"
)
)
{
jsonRemainder = StringUtils.StripLeadingJsonWhitespace(
jsonRemainder
);
// First try to read in the next key
nextKey = SimpleJsonParser.ParseOne(
jsonRemainder,
out jsonRemainder
);
// This must be a string, or invalid json
if (
(nextKey == null) ||
!nextKey.IsString()
)
{
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
// Should be whitespace : whitespace between key & value
jsonRemainder = StringUtils.StripLeadingJsonWhitespace(
jsonRemainder
);
// If no colon, invalid json, fail
if (
StringUtils.GetFirstCharacter(
jsonRemainder
) != ":"
)
{
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
// Step over colon & whitespace after colon
jsonRemainder = StringUtils.StripFirstCharacter(
jsonRemainder
);
jsonRemainder = StringUtils.StripLeadingJsonWhitespace(
jsonRemainder
);
// Try to extract element
nextElement = SimpleJsonParser.ParseOne(
jsonRemainder,
out jsonRemainder
);
// A returned null means that the json was not parseable
if (nextElement == null)
{
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
// Parsed successfully -> add to dictionary of parsed elements
values[
nextKey.AsString()
] = nextElement;
// Remove leading whitespace
jsonRemainder = StringUtils.StripLeadingJsonWhitespace(
jsonRemainder
);
// Next character should be either comma or bracket }
if (
(jsonRemainder.Length > 0) &&
(
StringUtils.GetFirstCharacter(
jsonRemainder
) == ","
)
)
{
// If it's a comma, remove it
jsonRemainder = StringUtils.StripFirstCharacter(
jsonRemainder
);
}
else if (
(jsonRemainder.Length > 0) &&
(
StringUtils.GetFirstCharacter(
jsonRemainder
) == "}"
)
)
{
/*
* For a closing bracket do nothing
* It will be caught on next loop condition check
*/
}
else
{
// If it's anything else, bad formatting
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
}
// Landing here should mean success
Success = true;
// Remember to remove closing bracket
jsonRemainder = StringUtils.StripFirstCharacter(
jsonRemainder
);
return(Success);
}
public bool Parse(
string jsonFragment,
out string jsonRemainder
)
{
jsonRemainder = StringUtils.StripLeadingJsonWhitespace(
jsonFragment
);
// The first character must be [ for an array
if (
StringUtils.GetFirstCharacter(
jsonRemainder
) != "["
)
{
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
// Remove the bracket character
jsonRemainder = StringUtils.StripFirstCharacter(
jsonRemainder
);
/*
* Now should have a series of json elements follow by commas
* except for the last json element which is followed by ]
*
* Conditions
* string still has some characters left in it
* we haven't reached the array closing bracket
*/
LinkedList <IJsonElement> elements = new LinkedList <IJsonElement>();
IJsonElement nextElement;
while (
(jsonRemainder.Length > 0) &&
(
StringUtils.GetFirstCharacter(
jsonRemainder
) != "]"
)
)
{
jsonRemainder = StringUtils.StripLeadingJsonWhitespace(
jsonRemainder
);
nextElement = SimpleJsonParser.ParseOne(
jsonRemainder,
out jsonRemainder
);
// A returned null means that the json was not parseable
if (nextElement == null)
{
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
// Parsed successfully -> add to list of parsed elements
elements.AddLast(
nextElement
);
// Remove leading whitespace
jsonRemainder = StringUtils.StripLeadingJsonWhitespace(
jsonRemainder
);
// Next character should be either comma or bracket
if (
(jsonRemainder.Length > 0) &&
(
StringUtils.GetFirstCharacter(
jsonRemainder
) == ","
)
)
{
// If it's a comma, remove it
jsonRemainder = StringUtils.StripFirstCharacter(
jsonRemainder
);
}
else if (
(jsonRemainder.Length > 0) &&
(
StringUtils.GetFirstCharacter(
jsonRemainder
) == "]"
)
)
{
/*
* For a closing bracket do nothing
* It will be caught on next loop condition check
*/
}
else
{
// If it's anything else, bad formatting
Success = false;
jsonRemainder = jsonFragment;
return(Success);
}
}
// Landing here should mean success
Success = true;
// Move linked list elements to values array
values = new IJsonElement[elements.Count];
elements.CopyTo(values, 0);
// Remember to remove the closing bracket
jsonRemainder = StringUtils.StripFirstCharacter(
jsonRemainder
);
return(Success);
}
