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1 parent da216a3 commit 71b8b4b8420cebe2a1f13418933fb2e0a711b80c @jacobmarble committed Jan 14, 2013
Showing with 174 additions and 1 deletion.
  1. +24 −0 LICENSE
  2. +40 −1 README.md
  3. +33 −0 package.json
  4. +61 −0 wgxpath.install.js
  5. +16 −0 word_of_the_day.js
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24 LICENSE
@@ -0,0 +1,24 @@
+
+The MIT License
+
+Copyright (c) 2007 Cybozu Labs, Inc.
+Copyright (c) 2012 Google Inc.
+Copyright (c) 2013 Jacob Marble
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
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41 README.md
@@ -1,4 +1,43 @@
node-wgxpath
============
-Wicked Good XPath as an NPM package
+[Wicked Good XPath](http://code.google.com/p/wicked-good-xpath/) is a fast implementation of [document.createEvaluation](https://developer.mozilla.org/en-US/docs/DOM/document.createExpression) and [document.evaluate](https://developer.mozilla.org/en-US/docs/DOM/document.evaluate) ([DOM3-XPath](http://www.w3.org/TR/2004/NOTE-DOM-Level-3-XPath-20040226/DOM3-XPath.html)) in pure Javascript.
+
+Version
+------
+
+I'm pretty lazy, so I didn't build Wicked Good XPath myself. When the pre-compiled [wgxpath.install.js](http://code.google.com/p/wicked-good-xpath/downloads/detail?name=wgxpath.install.js) is updated, I'll update this package.
+
+`0.x.y`: `x` refers to the Google SVN revision when `wgxpath.install.js` was built, and any improvements to this library will be indicated by `y`.
+
+Installation
+------------
+
+Install with [npm](http://npmjs.org/):
+
+ npm install wgxpath
+
+Example
+-------
+
+This example scrapes the Merriam-Webster Word of the Day. This code can also be found in the included `word_of_the_day.js`.
+
+```javascript
+var wgxpath = require('wgxpath');
+var jsdom = require('jsdom');
+
+var url = 'http://www.merriam-webster.com/word-of-the-day/';
+var expressionString = '//*[@id="content"]/div[3]/ul/li[1]/strong';
+
+jsdom.env({
+ html: url,
+ done: function(errors, window) {
+ wgxpath.install(window);
+ var expression = window.document.createExpression(expressionString);
+ var result = expression.evaluate(window.document,
+ wgxpath.XPathResultType.STRING_TYPE);
+ console.log('The Word of the Day is "' + result.stringValue + '."');
+ }
+});
+```
+
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33 package.json
@@ -0,0 +1,33 @@
+{
+ "name": "wgxpath",
+ "description": "Wicked Good XPath",
+ "version": "0.12.0",
+ "url": "http://code.google.com/p/wicked-good-xpath/",
+ "homepage": "https://github.com/jacobmarble/node-wgxpath",
+ "author": {
+ "name": "Jacob Marble",
+ "email": "jacobmarble@gmail.com"
+ },
+ "repository": {
+ "type": "git",
+ "url": "git://github.com/jacobmarble/node-wgxpath.git"
+ },
+ "bugs": {
+ "url": "https://github.com/jacobmarble/node-wgxpath/issues"
+ },
+ "licenses": [
+ {
+ "type": "MIT",
+ "url": "https://github.com/jacobmarble/node-wgxpath/blob/master/LICENSE"
+ }
+ ],
+ "main": "wgxpath.install.js",
+ "keywords": [
+ "xpath",
+ "wgxpath",
+ "wicked-good-xpath",
+ "parse",
+ "html"
+ ]
+}
+
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61 wgxpath.install.js
@@ -0,0 +1,61 @@
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+W.prototype.a=function(a){var b=a.a,c=k,c=this.d,d=k,e=k,f=0;c&&(d=c.name,e=c.l?R(c.l,a):k,f=1);if(this.m)if(!this.f&&this.e==nb)c=Ia(this.j,b,d,e),c=$a(this.c,c,f);else if(a=O((new W(ob,new N("node"))).a(a)),b=P(a))for(c=this.k(b,d,e,f);(b=P(a))!=k;)c=Qa(c,this.k(b,d,e,f));else c=new K;else c=this.k(a.a,d,e,f);return c};W.prototype.k=function(a,b,c,d){a=this.e.d(this.j,a,b,c);return a=$a(this.c,a,d)};
+W.prototype.toString=function(a){var a=a||"",b=a+"Step: \n",a=a+" ",b=b+(a+"Operator: "+(this.m?"//":"/")+"\n");this.e.h&&(b+=a+"Axis: "+this.e+"\n");b+=this.j.toString(a);if(this.c.length)for(var b=b+(a+"Predicates: \n"),c=0;c<this.c.length;c++)var d=c<this.c.length-1?", ":"",b=b+(this.c[c].toString(a)+d);return b};function pb(a,b,c,d){this.h=a;this.d=b;this.a=c;this.b=d}pb.prototype.toString=m("h");var qb={};
+function X(a,b,c,d){a in qb&&h(Error("Axis already created: "+a));b=new pb(a,b,c,!!d);return qb[a]=b}X("ancestor",function(a,b){for(var c=new K,d=b;d=d.parentNode;)a.a(d)&&Ra(c,d);return c},j);X("ancestor-or-self",function(a,b){var c=new K,d=b;do a.a(d)&&Ra(c,d);while(d=d.parentNode);return c},j);
+var hb=X("attribute",function(a,b){var c=new K,d=a.d();if("style"==d&&b.style&&D)return M(c,new E(b.style,b,"style",b.style.cssText)),c;var e=b.attributes;if(e)if(a instanceof N&&a.b===k||"*"==d)for(var d=0,f;f=e[d];d++)D?f.nodeValue&&M(c,Ea(b,f)):M(c,f);else(f=e.getNamedItem(d))&&(D?f.nodeValue&&M(c,Ea(b,f)):M(c,f));return c},l),nb=X("child",function(a,b,c,d,e){return(D?Na:Oa).call(k,a,b,p(c)?c:k,p(d)?d:k,e||new K)},l,j);X("descendant",Ia,l,j);
+var ob=X("descendant-or-self",function(a,b,c,d){var e=new K;I(b,c,d)&&a.a(b)&&M(e,b);return Ia(a,b,c,d,e)},l,j),kb=X("following",function(a,b,c,d){var e=new K;do for(var f=b;f=f.nextSibling;)I(f,c,d)&&a.a(f)&&M(e,f),e=Ia(a,f,c,d,e);while(b=b.parentNode);return e},l,j);X("following-sibling",function(a,b){for(var c=new K,d=b;d=d.nextSibling;)a.a(d)&&M(c,d);return c},l);X("namespace",function(){return new K},l);
+var rb=X("parent",function(a,b){var c=new K;if(9==b.nodeType)return c;if(2==b.nodeType)return M(c,b.ownerElement),c;var d=b.parentNode;a.a(d)&&M(c,d);return c},l),lb=X("preceding",function(a,b,c,d){var e=new K,f=[];do f.unshift(b);while(b=b.parentNode);for(var g=1,r=f.length;g<r;g++){for(var v=[],b=f[g];b=b.previousSibling;)v.unshift(b);for(var J=0,s=v.length;J<s;J++)b=v[J],I(b,c,d)&&a.a(b)&&M(e,b),e=Ia(a,b,c,d,e)}return e},j,j);
+X("preceding-sibling",function(a,b){for(var c=new K,d=b;d=d.previousSibling;)a.a(d)&&Ra(c,d);return c},j);var sb=X("self",function(a,b){var c=new K;a.a(b)&&M(c,b);return c},l);function tb(a){t.call(this,1);this.c=a;this.f=a.f;this.b=a.b}q(tb);tb.prototype.a=function(a){return-Q(this.c,a)};tb.prototype.toString=function(a){var a=a||"",b=a+"UnaryExpr: -\n";return b+=this.c.toString(a+" ")};function ub(a){t.call(this,4);this.c=a;this.f=wa(this.c,function(a){return a.f});this.b=wa(this.c,function(a){return a.b})}q(ub);ub.prototype.a=function(a){var b=new K;C(this.c,function(c){c=c.a(a);c instanceof K||h(Error("PathExpr must evaluate to NodeSet."));b=Qa(b,c)});return b};ub.prototype.toString=function(a){var b=a||"",c=b+"UnionExpr:\n",b=b+" ";C(this.c,function(a){c+=a.toString(b)+"\n"});return c.substring(0,c.length)};function vb(a){this.a=a}function wb(a){for(var b,c=[];;){Y(a,"Missing right hand side of binary expression.");b=xb(a);var d=G(a.a);if(!d)break;var e=(d=Ya[d]||k)&&d.p;if(!e){a.a.a--;break}for(;c.length&&e<=c[c.length-1].p;)b=new Va(c.pop(),c.pop(),b);c.push(b,d)}for(;c.length;)b=new Va(c.pop(),c.pop(),b);return b}function Y(a,b){a.a.b.length<=a.a.a&&h(Error(b))}function yb(a,b){var c=G(a.a);c!=b&&h(Error("Bad token, expected: "+b+" got: "+c))}
+function zb(a){a=G(a.a);")"!=a&&h(Error("Bad token: "+a))}function Ab(a){a=G(a.a);2>a.length&&h(Error("Unclosed literal string"));return new eb(a)}function Bb(a){return"*"!=F(a.a)&&":"==F(a.a,1)&&"*"==F(a.a,2)?new L(G(a.a)+G(a.a)+G(a.a)):new L(G(a.a))}
+function Cb(a){var b,c=[],d;if("/"==F(a.a)||"//"==F(a.a)){b=G(a.a);d=F(a.a);if("/"==b&&(a.a.b.length<=a.a.a||"."!=d&&".."!=d&&"@"!=d&&"*"!=d&&!/(?![0-9])[\w]/.test(d)))return new ib;d=new ib;Y(a,"Missing next location step.");b=Db(a,b);c.push(b)}else{a:{b=F(a.a);d=b.charAt(0);switch(d){case "$":h(Error("Variable reference not allowed in HTML XPath"));case "(":G(a.a);b=wb(a);Y(a,'unclosed "("');yb(a,")");break;case '"':case "'":b=Ab(a);break;default:if(isNaN(+b))if(!db(b)&&/(?![0-9])[\w]/.test(d)&&
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+function Db(a,b){var c,d,e;"/"!=b&&"//"!=b&&h(Error('Step op should be "/" or "//"'));if("."==F(a.a))return d=new W(sb,new N("node")),G(a.a),d;if(".."==F(a.a))return d=new W(rb,new N("node")),G(a.a),d;var f;"@"==F(a.a)?(f=hb,G(a.a),Y(a,"Missing attribute name")):"::"==F(a.a,1)?(/(?![0-9])[\w]/.test(F(a.a).charAt(0))||h(Error("Bad token: "+G(a.a))),e=G(a.a),(f=qb[e]||k)||h(Error("No axis with name: "+e)),G(a.a),Y(a,"Missing node name")):f=nb;e=F(a.a);if(/(?![0-9])[\w]/.test(e.charAt(0)))if("("==F(a.a,
+1)){db(e)||h(Error("Invalid node type: "+e));c=G(a.a);db(c)||h(Error("Invalid type name: "+c));yb(a,"(");Y(a,"Bad nodetype");e=F(a.a).charAt(0);var g=k;if('"'==e||"'"==e)g=Ab(a);Y(a,"Bad nodetype");zb(a);c=new N(c,g)}else c=Bb(a);else"*"==e?c=Bb(a):h(Error("Bad token: "+G(a.a)));e=new mb(Eb(a),f.a);return d||new W(f,c,e,"//"==b)}function Eb(a){for(var b=[];"["==F(a.a);){G(a.a);Y(a,"Missing predicate expression.");var c=wb(a);b.push(c);Y(a,"Unclosed predicate expression.");yb(a,"]")}return b}
+function xb(a){if("-"==F(a.a))return G(a.a),new tb(xb(a));var b=Cb(a);if("|"!=F(a.a))a=b;else{for(b=[b];"|"==G(a.a);)Y(a,"Missing next union location path."),b.push(Cb(a));a.a.a--;a=new ub(b)}return a};function Fb(a){a.length||h(Error("Empty XPath expression."));for(var a=a.match(Ga),b=0;b<a.length;b++)Ha.test(a[b])&&a.splice(b,1);a=new Fa(a);a.b.length<=a.a&&h(Error("Invalid XPath expression."));var c=wb(new vb(a));a.b.length<=a.a||h(Error("Bad token: "+G(a)));this.evaluate=function(a,b){var f=c.a(new A(a));return new Z(f,b)}}
+function Z(a,b){0==b&&(a instanceof K?b=4:"string"==typeof a?b=2:"number"==typeof a?b=1:"boolean"==typeof a?b=3:h(Error("Unexpected evaluation result.")));2!=b&&(1!=b&&3!=b&&!(a instanceof K))&&h(Error("value could not be converted to the specified type"));this.resultType=b;var c;switch(b){case 2:this.stringValue=a instanceof K?Ta(a):""+a;break;case 1:this.numberValue=a instanceof K?+Ta(a):+a;break;case 3:this.booleanValue=a instanceof K?0<a.i:!!a;break;case 4:case 5:case 6:case 7:var d=O(a);c=[];
+for(var e=P(d);e;e=P(d))c.push(e instanceof E?e.a:e);this.snapshotLength=a.i;this.invalidIteratorState=l;break;case 8:case 9:d=Sa(a);this.singleNodeValue=d instanceof E?d.a:d;break;default:h(Error("Unknown XPathResult type."))}var f=0;this.iterateNext=function(){4!=b&&5!=b&&h(Error("iterateNext called with wrong result type"));return f>=c.length?k:c[f++]};this.snapshotItem=function(a){6!=b&&7!=b&&h(Error("snapshotItem called with wrong result type"));return a>=c.length||0>a?k:c[a]}}Z.ANY_TYPE=0;
+Z.NUMBER_TYPE=1;Z.STRING_TYPE=2;Z.BOOLEAN_TYPE=3;Z.UNORDERED_NODE_ITERATOR_TYPE=4;Z.ORDERED_NODE_ITERATOR_TYPE=5;Z.UNORDERED_NODE_SNAPSHOT_TYPE=6;Z.ORDERED_NODE_SNAPSHOT_TYPE=7;Z.ANY_UNORDERED_NODE_TYPE=8;Z.FIRST_ORDERED_NODE_TYPE=9;function Gb(a){var a=a||n,b=a.document;b.evaluate||(a.XPathResult=Z,b.evaluate=function(a,b,e,f){return(new Fb(a)).evaluate(b,f)},b.createExpression=function(a){return new Fb(a)})}var Hb=["wgxpath","install"],$=n;!(Hb[0]in $)&&$.execScript&&$.execScript("var "+Hb[0]);for(var Ib;Hb.length&&(Ib=Hb.shift());)!Hb.length&&Gb!==i?$[Ib]=Gb:$=$[Ib]?$[Ib]:$[Ib]={};})()
+
+// Export for Node.js.
+module.exports.install = wgxpath.install;
+module.exports.XPathResultType = {
+ ANY_TYPE: 0,
+ NUMBER_TYPE: 1,
+ STRING_TYPE: 2,
+ BOOLEAN_TYPE: 3,
+ UNORDERED_NODE_ITERATOR_TYPE: 4,
+ ORDERED_NODE_ITERATOR_TYPE: 5,
+ UNORDERED_NODE_SNAPSHOT_TYPE: 6,
+ ORDERED_NODE_SNAPSHOT_TYPE: 7,
+ ANY_UNORDERED_NODE_TYPE: 8,
+ FIRST_ORDERED_NODE_TYPE: 9
+};
+
View
16 word_of_the_day.js
@@ -0,0 +1,16 @@
+var wgxpath = require('wgxpath');
+var jsdom = require('jsdom');
+
+var url = 'http://www.merriam-webster.com/word-of-the-day/';
+var expressionString = '//*[@id="content"]/div[3]/ul/li[1]/strong';
+
+jsdom.env({
+ html: url,
+ done: function(errors, window) {
+ wgxpath.install(window);
+ var expression = window.document.createExpression(expressionString);
+ var result = expression.evaluate(window.document,
+ wgxpath.XPathResultType.STRING_TYPE);
+ console.log('The Word of the Day is "' + result.stringValue + '."');
+ }
+});

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