git-svn-id: file:///tmp/snv/trunk@9 12951d8a-c33d-4b7c-b961-822215c816e1master
parent
3d33406796
commit
0aa71851ef
@ -1,7 +1,7 @@ |
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move to JSON data format -- done |
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XBL -- done |
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format JS/refactor JS/Use FUEL -- done |
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put license |
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caching/db, threading, XUL templates |
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new UI |
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caching/db, threading |
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new UI, icons, thumbnails |
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JQuery |
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put license |
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|
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@ -0,0 +1,355 @@ |
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/* |
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JPath 1.0.3 - json equivalent to xpath |
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Copyright (C) 2007 Bryan English <bryan at bluelinecity dot com> |
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This program is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 2 |
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of the License, or (at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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|
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Usage:
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var jpath = new JPath( myjsonobj ); |
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var somevalue = jpath.$('book/title').json; //results in title
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//or
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var somevalue = jpath.query('book/title'); //results in title
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Supported XPath-like Syntax: |
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/tagname |
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//tagname
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tagname |
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* wildcard |
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[] predicates |
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operators ( >=, ==, <= ) |
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array selection |
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..
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* |
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and, or |
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nodename[0] |
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nodename[last()] |
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nodename[position()] |
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nodename[last()-1] |
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nodename[somenode > 3]/node |
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nodename[count() > 3]/node |
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Tested With: |
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Firefox 2-3, IE 6-7 |
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Update Log: |
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1.0.1 - Bugfix for zero-based element selection |
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1.0.2 - Bugfix for IE not handling eval() and returning a function |
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1.0.3 - Bugfix added support for underscore and dash in query() function |
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Bugfix improper use of Array.concat which was flattening arrays |
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Added support for single equal sign in query() function |
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Added support for count() xpath function |
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Added support for and, or boolean expression in predicate blocks |
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Added support for global selector $$ and //
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Added support for wildcard (*) selector support
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*/ |
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function JPath( json, parent ) |
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{
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this.json = json;
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this._parent = parent;
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} |
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JPath.prototype = { |
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/* |
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Property: json |
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Copy of current json segment to operate on |
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*/ |
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json: null, |
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/* |
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Property: parent |
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Parent json object, null if root. |
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*/ |
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parent: null, |
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/* |
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Method: $ |
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Performs a find query on the current jpath object. |
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Parameters: |
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str - mixed, find query to perform. Can consist of a nodename or nodename path or function object or integer. |
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Return: |
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jpath - Returns the resulting jpath object after performing find query. |
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*/ |
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'$': function ( str ) |
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{ |
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var result = null; |
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var working = this; |
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if ( this.json && str !== null ) |
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{ |
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switch ( typeof(str) ) |
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{ |
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case 'function': |
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result = this.f(str).json; |
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break; |
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case 'number': |
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result = this.json[str] || null; |
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break; |
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case 'string': |
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var names = str.split('/');
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//foreach slash delimited node name//
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for ( var i=0; i<names.length ; i++ ) |
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{ |
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var name = new RegExp('^' + names[i].replace(/\*/g,'.*') + '$');
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var isArray = (working.json instanceof Array); |
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var a = new Array(); |
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//foreach working node property//
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for ( var p in working.json ) |
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{ |
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if ( typeof( working.json[p] ) != 'function' ) |
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{ |
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if ( isArray && (arguments.callee.caller != this.$$) ) |
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{ |
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a = a.concat( this.findAllByRegExp( name, working.json[p] ) ); |
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} |
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else if ( name.test(p) ) |
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{
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a.push( working.json[p] ); |
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} |
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}
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} |
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working = new JPath( ( a.length==0 ? null : ( ( a.length == 1) ? a[0] : a ) ), working ); |
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} |
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return working; |
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break; |
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}
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} |
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return new JPath( result, this ); |
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}, |
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/* |
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Method: $$ |
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Performs a global, recursive find query on the current jpath object. |
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Parameters: |
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str - mixed, find query to perform. Can consist of a nodename or nodename path or function object or integer. |
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Return: |
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jpath - Returns the resulting jpath object after performing find query. |
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*/ |
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'$$': function( str ) |
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{
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var r = this.$(str,true).json; |
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var arr = new Array(); |
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if ( r instanceof Array )
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arr = arr.concat(r);
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else if ( r !== null ) |
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arr.push(r); |
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for ( var p in this.json ) |
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{ |
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if ( typeof( this.json[p] ) == 'object' ) |
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{ |
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arr = arr.concat( new JPath( this.json[p], this ).$$(str).json ); |
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} |
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} |
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return new JPath( arr, this ); |
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}, |
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/* |
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Method: findAllByRegExp |
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Looks through a list of an object properties using a regular expression |
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Parameters: |
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re - regular expression, to use to search with |
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obj - object, the object to search through |
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Returns: |
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array - resulting properties |
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*/ |
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findAllByRegExp: function( re, obj ) |
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{ |
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var a = new Array(); |
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for ( var p in obj ) |
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{ |
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if ( obj instanceof Array ) |
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{ |
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a = a.concat( this.findAllByRegExp( re, obj[p] ) ); |
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} |
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else if ( typeof( obj[p] ) != 'function' && re.test(p) ) |
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{ |
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a.push( obj[p] ); |
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} |
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} |
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return a; |
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}, |
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/* |
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Method: query (beta) |
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Performs a find query on the current jpath object using a single string similar to xpath. This method |
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is currently expirimental. |
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Parameters: |
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str - string, full xpath-like query to perform on the current object. |
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Return: |
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mixed - Returns the resulting json value after performing find query. |
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*/ |
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query: function( str ) |
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{ |
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var re = { |
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" and ":" && ", |
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" or ":" || ", |
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"([\\#\\*\\@a-z\\_][\\*a-z0-9_\\-]*)(?=(?:\\s|$|\\[|\\]|\\/))" : "\$('$1').", |
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"\\[([0-9])+\\]" : "\$($1).", |
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"\\.\\." : "parent().", |
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"\/\/" : "$", |
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"(^|\\[|\\s)\\/" : "$1root().", |
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"\\/" : '', |
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"([^\\=\\>\\<\\!])\\=([^\\=])" : '$1==$2', |
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"\\[" : "$(function(j){ with(j){return(", |
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"\\]" : ");}}).", |
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"\\(\\.":'(', |
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"(\\.|\\])(?!\\$|\\p)":"$1json", |
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"count\\(([^\\)]+)\\)":"count('$1')" |
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}; |
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//save quoted strings//
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var quotes = /(\'|\")([^\1]*)\1/; |
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var saves = new Array(); |
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while ( quotes.test(str) ) |
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{ |
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saves.push( str.match(quotes)[2] );
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str = str.replace(quotes,'%'+ (saves.length-1) +'%'); |
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} |
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for ( var e in re ) |
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{ |
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str = str.replace( new RegExp(e,'ig'), re[e] ); |
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} |
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//alert('this.' + str.replace(/\%(\d+)\%/g,'saves[$1]') + ";");
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return eval('this.' + str.replace(/\%(\d+)\%/g,'saves[$1]') + ";"); |
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}, |
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/* |
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Method: f |
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Performs the equivilant to an xpath predicate eval on the current nodeset. |
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Parameters: |
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f - function, an iterator function that is executed for every json node and is expected to return a boolean |
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value which determines if that particular node is selected. Alternativly you can submit a string which will be |
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inserted into a prepared function. |
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Return: |
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jpath - Returns the resulting jpath object after performing find query. |
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*/ |
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f: function ( iterator ) |
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{ |
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var a = new Array(); |
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if ( typeof(iterator) == 'string' ) |
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{ |
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eval('iterator = function(j){with(j){return('+ iterator +');}}'); |
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} |
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for ( var p in this.json ) |
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{ |
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var j = new JPath(this.json[p], this); |
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j.index = p; |
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if ( iterator( j ) ) |
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{ |
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a.push( this.json[p] ); |
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} |
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} |
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return new JPath( a, this ); |
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}, |
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/* |
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Method: parent |
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Returns the parent jpath object or itself if its the root node |
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Return: |
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jpath - Returns the parent jpath object or itself if its the root node |
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*/ |
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parent: function() |
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{ |
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return ( (this._parent) ? this._parent : this ); |
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}, |
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/* |
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Method: position |
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Returns the index position of the current node. Only valid within a function or predicate |
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Return: |
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int - array index position of this json object. |
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*/ |
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position: function() |
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{ |
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return this.index; |
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}, |
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/* |
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Method: last |
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Returns true if this is the last node in the nodeset. Only valid within a function or predicate |
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Return: |
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booean - Returns true if this is the last node in the nodeset |
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*/ |
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last: function() |
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{ |
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return (this.index == (this._parent.json.length-1)); |
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}, |
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/* |
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Method: count |
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Returns the count of child nodes in the current node |
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Parameters: |
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string - optional node name to count, defaults to all |
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Return: |
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booean - Returns number of child nodes found |
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*/ |
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count: function(n) |
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{ |
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var found = this.$( n || '*').json;
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return ( found ? ( found instanceof Array ? found.length : 1 ) : 0 ); |
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}, |
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/* |
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Method: root |
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Returns the root jpath object. |
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Return: |
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jpath - The top level, root jpath object. |
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*/ |
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root: function () |
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{ |
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return ( this._parent ? this._parent.root() : this ); |
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} |
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}; |
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