466 lines
13 KiB
Matlab
466 lines
13 KiB
Matlab
function data = loadubjson(fname,varargin)
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import jsonlab.*
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%
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% data=loadubjson(fname,opt)
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% or
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% data=loadubjson(fname,'param1',value1,'param2',value2,...)
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%
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% parse a JSON (JavaScript Object Notation) file or string
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%
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% authors:Qianqian Fang (q.fang <at> neu.edu)
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% created on 2013/08/01
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%
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% $Id$
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%
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% input:
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% fname: input file name, if fname contains "{}" or "[]", fname
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% will be interpreted as a UBJSON string
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% opt: a struct to store parsing options, opt can be replaced by
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% a list of ('param',value) pairs - the param string is equivallent
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% to a field in opt. opt can have the following
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% fields (first in [.|.] is the default)
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%
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% opt.SimplifyCell [0|1]: if set to 1, loadubjson will call cell2mat
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% for each element of the JSON data, and group
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% arrays based on the cell2mat rules.
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% opt.IntEndian [B|L]: specify the endianness of the integer fields
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% in the UBJSON input data. B - Big-Endian format for
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% integers (as required in the UBJSON specification);
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% L - input integer fields are in Little-Endian order.
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% opt.NameIsString [0|1]: for UBJSON Specification Draft 8 or
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% earlier versions (JSONLab 1.0 final or earlier),
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% the "name" tag is treated as a string. To load
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% these UBJSON data, you need to manually set this
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% flag to 1.
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%
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% output:
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% dat: a cell array, where {...} blocks are converted into cell arrays,
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% and [...] are converted to arrays
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%
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% examples:
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% obj=struct('string','value','array',[1 2 3]);
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% ubjdata=saveubjson('obj',obj);
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% dat=loadubjson(ubjdata)
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% dat=loadubjson(['examples' filesep 'example1.ubj'])
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% dat=loadubjson(['examples' filesep 'example1.ubj'],'SimplifyCell',1)
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%
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% license:
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% BSD, see LICENSE_BSD.txt file for details
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%
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% -- this function is part of JSONLab toolbox (http://iso2mesh.sf.net/cgi-bin/index.cgi?jsonlab)
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%
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global pos inStr len esc index_esc len_esc isoct arraytoken fileendian systemendian
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if(regexp(fname,'[\{\}\]\[]','once'))
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string=fname;
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elseif(exist(fname,'file'))
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fid = fopen(fname,'rb');
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string = fread(fid,inf,'uint8=>char')';
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fclose(fid);
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else
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error('input file does not exist');
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end
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pos = 1; len = length(string); inStr = string;
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isoct=exist('OCTAVE_VERSION','builtin');
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arraytoken=find(inStr=='[' | inStr==']' | inStr=='"');
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jstr=regexprep(inStr,'\\\\',' ');
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escquote=regexp(jstr,'\\"');
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arraytoken=sort([arraytoken escquote]);
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% String delimiters and escape chars identified to improve speed:
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esc = find(inStr=='"' | inStr=='\' ); % comparable to: regexp(inStr, '["\\]');
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index_esc = 1; len_esc = length(esc);
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opt=varargin2struct(varargin{:});
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fileendian=upper(jsonopt('IntEndian','B',opt));
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[os,maxelem,systemendian]=computer;
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jsoncount=1;
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while pos <= len
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switch(next_char)
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case '{'
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data{jsoncount} = parse_object(opt);
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case '['
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data{jsoncount} = parse_array(opt);
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otherwise
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error_pos('Outer level structure must be an object or an array');
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end
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jsoncount=jsoncount+1;
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end % while
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jsoncount=length(data);
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if(jsoncount==1 && iscell(data))
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data=data{1};
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end
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%%-------------------------------------------------------------------------
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function object = parse_object(varargin)
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import jsonlab.*
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parse_char('{');
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object = [];
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type='';
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count=-1;
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if(next_char == '$')
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type=inStr(pos+1); % TODO
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pos=pos+2;
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end
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if(next_char == '#')
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pos=pos+1;
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count=double(parse_number());
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end
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if next_char ~= '}'
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num=0;
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while 1
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if(jsonopt('NameIsString',0,varargin{:}))
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str = parseStr(varargin{:});
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else
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str = parse_name(varargin{:});
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end
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if isempty(str)
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error_pos('Name of value at position %d cannot be empty');
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end
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%parse_char(':');
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val = parse_value(varargin{:});
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num=num+1;
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object.(valid_field(str))=val;
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if next_char == '}' || (count>=0 && num>=count)
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break;
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end
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%parse_char(',');
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end
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end
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if(count==-1)
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parse_char('}');
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end
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if(isstruct(object))
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object=struct2jdata(object,struct('Base64',0));
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end
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%%-------------------------------------------------------------------------
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function [cid,len]=elem_info(type)
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import jsonlab.*
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id=strfind('iUIlLdD',type);
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dataclass={'int8','uint8','int16','int32','int64','single','double'};
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bytelen=[1,1,2,4,8,4,8];
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if(id>0)
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cid=dataclass{id};
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len=bytelen(id);
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else
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error_pos('unsupported type at position %d');
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end
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%%-------------------------------------------------------------------------
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function [data, adv]=parse_block(type,count,varargin)
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import jsonlab.*
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global pos inStr isoct fileendian systemendian
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[cid,len]=elem_info(type);
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datastr=inStr(pos:pos+len*count-1);
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newdata=uint8(datastr);
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id=strfind('iUIlLdD',type);
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if(fileendian~=systemendian)
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newdata=swapbytes(typecast(newdata,cid));
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end
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data=typecast(newdata,cid);
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adv=double(len*count);
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%%-------------------------------------------------------------------------
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function object = parse_array(varargin) % JSON array is written in row-major order
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import jsonlab.*
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global pos inStr
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parse_char('[');
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object = cell(0, 1);
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dim=[];
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type='';
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count=-1;
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if(next_char == '$')
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type=inStr(pos+1);
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pos=pos+2;
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end
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if(next_char == '#')
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pos=pos+1;
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if(next_char=='[')
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dim=parse_array(varargin{:});
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count=prod(double(dim));
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else
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count=double(parse_number());
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end
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end
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if(~isempty(type))
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if(count>=0)
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[object, adv]=parse_block(type,count,varargin{:});
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if(~isempty(dim))
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object=reshape(object,dim);
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end
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pos=pos+adv;
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return;
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else
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endpos=matching_bracket(inStr,pos);
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[cid,len]=elem_info(type);
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count=(endpos-pos)/len;
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[object, adv]=parse_block(type,count,varargin{:});
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pos=pos+adv;
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parse_char(']');
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return;
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end
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end
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if next_char ~= ']'
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while 1
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val = parse_value(varargin{:});
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object{end+1} = val;
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if next_char == ']'
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break;
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end
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%parse_char(',');
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end
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end
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if(jsonopt('SimplifyCell',0,varargin{:})==1)
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try
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oldobj=object;
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object=cell2mat(object')';
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if(iscell(oldobj) && isstruct(object) && numel(object)>1 && jsonopt('SimplifyCellArray',1,varargin{:})==0)
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object=oldobj;
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elseif(size(object,1)>1 && ismatrix(object))
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object=object';
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end
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catch
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end
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end
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if(count==-1)
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parse_char(']');
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end
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%%-------------------------------------------------------------------------
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function parse_char(c)
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import jsonlab.*
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global pos inStr len
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skip_whitespace;
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if pos > len || inStr(pos) ~= c
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error_pos(sprintf('Expected %c at position %%d', c));
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else
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pos = pos + 1;
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skip_whitespace;
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end
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%%-------------------------------------------------------------------------
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function c = next_char
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import jsonlab.*
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global pos inStr len
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skip_whitespace;
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if pos > len
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c = [];
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else
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c = inStr(pos);
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end
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%%-------------------------------------------------------------------------
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function skip_whitespace
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import jsonlab.*
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global pos inStr len
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while pos <= len && isspace(inStr(pos))
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pos = pos + 1;
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end
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%%-------------------------------------------------------------------------
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function str = parse_name(varargin)
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import jsonlab.*
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global pos inStr
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bytelen=double(parse_number());
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if(length(inStr)>=pos+bytelen-1)
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str=inStr(pos:pos+bytelen-1);
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pos=pos+bytelen;
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else
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error_pos('End of file while expecting end of name');
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end
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%%-------------------------------------------------------------------------
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function str = parseStr(varargin)
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import jsonlab.*
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global pos inStr
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% len, ns = length(inStr), keyboard
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type=inStr(pos);
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if type ~= 'S' && type ~= 'C' && type ~= 'H'
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error_pos('String starting with S expected at position %d');
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else
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pos = pos + 1;
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end
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if(type == 'C')
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str=inStr(pos);
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pos=pos+1;
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return;
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end
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bytelen=double(parse_number());
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if(length(inStr)>=pos+bytelen-1)
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str=inStr(pos:pos+bytelen-1);
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pos=pos+bytelen;
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else
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error_pos('End of file while expecting end of inStr');
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end
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%%-------------------------------------------------------------------------
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function num = parse_number(varargin)
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import jsonlab.*
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global pos inStr isoct fileendian systemendian
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id=strfind('iUIlLdD',inStr(pos));
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if(isempty(id))
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error_pos('expecting a number at position %d');
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end
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type={'int8','uint8','int16','int32','int64','single','double'};
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bytelen=[1,1,2,4,8,4,8];
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datastr=inStr(pos+1:pos+bytelen(id));
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newdata=uint8(datastr);
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if(fileendian~=systemendian)
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newdata=swapbytes(typecast(newdata,type{id}));
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end
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num=typecast(newdata,type{id});
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pos = pos + bytelen(id)+1;
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%%-------------------------------------------------------------------------
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function val = parse_value(varargin)
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import jsonlab.*
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global pos inStr
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switch(inStr(pos))
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case {'S','C','H'}
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val = parseStr(varargin{:});
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return;
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case '['
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val = parse_array(varargin{:});
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return;
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case '{'
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val = parse_object(varargin{:});
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return;
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case {'i','U','I','l','L','d','D'}
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val = parse_number(varargin{:});
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return;
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case 'T'
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val = true;
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pos = pos + 1;
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return;
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case 'F'
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val = false;
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pos = pos + 1;
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return;
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case {'Z','N'}
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val = [];
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pos = pos + 1;
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return;
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end
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error_pos('Value expected at position %d');
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%%-------------------------------------------------------------------------
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function error_pos(msg)
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import jsonlab.*
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global pos inStr len
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poShow = max(min([pos-15 pos-1 pos pos+20],len),1);
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if poShow(3) == poShow(2)
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poShow(3:4) = poShow(2)+[0 -1]; % display nothing after
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end
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msg = [sprintf(msg, pos) ': ' ...
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inStr(poShow(1):poShow(2)) '<error>' inStr(poShow(3):poShow(4)) ];
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error( ['JSONparser:invalidFormat: ' msg] );
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%%-------------------------------------------------------------------------
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function str = valid_field(str)
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import jsonlab.*
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global isoct
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% From MATLAB doc: field names must begin with a letter, which may be
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% followed by any combination of letters, digits, and underscores.
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% Invalid characters will be converted to underscores, and the prefix
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% "x0x[Hex code]_" will be added if the first character is not a letter.
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pos=regexp(str,'^[^A-Za-z]','once');
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if(~isempty(pos))
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if(~isoct)
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str=regexprep(str,'^([^A-Za-z])','x0x${sprintf(''%X'',unicode2native($1))}_','once');
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else
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str=sprintf('x0x%X_%s',char(str(1)),str(2:end));
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end
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end
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if(isempty(regexp(str,'[^0-9A-Za-z_]', 'once' )))
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return;
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end
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if(~isoct)
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str=regexprep(str,'([^0-9A-Za-z_])','_0x${sprintf(''%X'',unicode2native($1))}_');
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else
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pos=regexp(str,'[^0-9A-Za-z_]');
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if(isempty(pos))
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return;
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end
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str0=str;
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pos0=[0 pos(:)' length(str)];
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str='';
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for i=1:length(pos)
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str=[str str0(pos0(i)+1:pos(i)-1) sprintf('_0x%X_',str0(pos(i)))];
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end
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if(pos(end)~=length(str))
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str=[str str0(pos0(end-1)+1:pos0(end))];
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end
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end
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%str(~isletter(str) & ~('0' <= str & str <= '9')) = '_';
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%%-------------------------------------------------------------------------
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function endpos = matching_quote(str,pos)
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import jsonlab.*
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len=length(str);
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while(pos<len)
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if(str(pos)=='"')
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if(~(pos>1 && str(pos-1)=='\'))
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endpos=pos;
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return;
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end
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end
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pos=pos+1;
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end
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error('unmatched quotation mark');
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%%-------------------------------------------------------------------------
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function [endpos, e1l, e1r, maxlevel] = matching_bracket(str,pos)
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import jsonlab.*
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global arraytoken
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level=1;
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maxlevel=level;
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endpos=0;
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bpos=arraytoken(arraytoken>=pos);
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tokens=str(bpos);
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len=length(tokens);
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pos=1;
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e1l=[];
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e1r=[];
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while(pos<=len)
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c=tokens(pos);
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if(c==']')
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level=level-1;
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if(isempty(e1r))
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e1r=bpos(pos);
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end
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if(level==0)
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endpos=bpos(pos);
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return
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end
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end
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if(c=='[')
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if(isempty(e1l))
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e1l=bpos(pos);
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end
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level=level+1;
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maxlevel=max(maxlevel,level);
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end
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if(c=='"')
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pos=matching_quote(tokens,pos+1);
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end
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pos=pos+1;
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end
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if(endpos==0)
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error('unmatched "]"');
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end
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