Comments (8)
This should be a good idea. But is it still need to validate the JSON number
format? If it need to support more flexible format, how to determine ending of
a number?
I have two ideas of API in my mind:
1. Generates a Handler::Number(const Ch* str, SizeType length) event. This
requires Reader knows the termination of the number type.
2. Generates a Handler::Number(InputStream& stream) event. Then user can do
what ever he wants to parse the number from the input stream.
Any comment?
Original comment by [email protected]
on 26 Nov 2011 at 3:26
from rapidjson.
termination of the number - comma or end of section. For example we have:
{
"xOffset": 250 + parent.with/2,
"yOffset": 0.4 + sin(2)
}
Original comment by [email protected]
on 26 Nov 2011 at 4:34
from rapidjson.
I just wondering, in this particular case, will it be better to just use string
instead:
{
"xOffset": "250 + parent.with/2",
"yOffset": "0.4 + sin(2)"
}
Your application can permit "xOffset" be either a number or string. When it was
parsed as a string after JSON parsing, your application can parse it as an
expression or whatever you need.
To support your idea directly, the parser can just copy the characters from
input stream until it encounters ",", "]", or "}". But I can also think of some
cases the "expression" may fool the parser. For example, if the expression
support indexing with []. E.g.
[ 250 + children["a"].width ]
Original comment by [email protected]
on 26 Nov 2011 at 4:49
from rapidjson.
Sure, we can use strings for such cases. This is the simplest solution.
Original comment by [email protected]
on 26 Nov 2011 at 4:54
from rapidjson.
We wouldn't really know if we're able to evaluate the expression during
parse(). We would be using JSON as a model format to build the object tree and
then evaluating the expressions. That gives us access to things like
'parent.width.'
If you do write up the Handler::Number() to parse the stream, you still don't
have access to any DOM structure, just the character stream. That means the
custom Handler::Number would only be able to use custom variables that were
loaded in your expression parser and nothing from the JSON DOM tree.
You could add a post processing step, but then why not let that responsibility
fall on the end user?
***
As for delimiting the expression that may contain [] () {} or what ever, use a
stack or a counter to ++increment on opening braces and --decrement on closing.
If the counter falls below zero then the section has closed. Always stop
parsing on commas.
Original comment by [email protected]
on 26 Nov 2011 at 7:07
from rapidjson.
Original comment by [email protected]
on 3 Dec 2011 at 4:44
from rapidjson.
Original comment by [email protected]
on 14 Nov 2012 at 4:17
from rapidjson.
Original comment by [email protected]
on 20 Jun 2014 at 8:27
- Changed state: WontFix
from rapidjson.
Related Issues (20)
- Fix of some clang warnings HOT 3
- Parsing crash HOT 2
- SIMD instruction can cause seg-fault/UMR HOT 6
- Adding elements to an array HOT 5
- Patches from GitHub HOT 4
- GenericDocument::ParseStream: make SourceEncoding optional HOT 1
- rapidjson accessing memory it doesn't own HOT 4
- Memory access error due to 'memcmp' HOT 4
- Document leaks memory when stored as Value. HOT 4
- gcc-4.9.0 compile warnings HOT 1
- 'Convert JSON document to string' PROBLEM solved... HOT 1
- Error compiling on OS X 10.6 HOT 4
- Compilation error on gcc 3.4.6 HOT 1
- [address alignment issue]tutorial.cpp isn't working on HP-UX 11.23 ia64 HOT 5
- Blaireaux HOT 1
- Cannot parse min normal positive double
- reader.h compiler errors clang (use 'template' keyword to treat 'Stack' as a dependent template name) HOT 2
- Failed to parse nested json buffer HOT 1
- lacks ending quotation before the end of string HOT 1
- Problem with FindMeber HOT 2
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