Update svgpan, add license, separate pprof-specific code. (#284)

The third_party svg directory has been a mix of pprof-specific code and
svgpan itself. This change moves the pprof-specific code out and adds a
license file. It also updates svgpan to 1.2.2 from
https://github.com/aleofreddi/svgpan while we are here. It also renames
the directory to svgpan to have all directories under third_party be
named precisely over the third party package they hold.

internal/driver/commands.go

 
 	"github.com/google/pprof/internal/plugin"
 	"github.com/google/pprof/internal/report"
-	"github.com/google/pprof/third_party/svg"
 )
 
 // commands describes the commands accepted by pprof.
 		if err := generateSVG(input, baseSVG, ui); err != nil {
 			return err
 		}
-		_, err := output.Write([]byte(svg.Massage(baseSVG.String())))
+		_, err := output.Write([]byte(massageSVG(baseSVG.String())))
 		return err
 	}
 }

third_party/svg/svg.go → internal/driver/svg.go

 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package svg provides tools related to handling of SVG files
-package svg
+package driver
 
 import (
 	"regexp"
 	"strings"
+
+	"github.com/google/pprof/third_party/svgpan"
 )
 
 var (
 	svgClose = regexp.MustCompile(`</svg>`)
 )
 
-// Massage enhances the SVG output from DOT to provide better
-// panning inside a web browser. It uses the SVGPan library, which is
-// embedded into the svgPanJS variable.
-func Massage(svg string) string {
+// massageSVG enhances the SVG output from DOT to provide better
+// panning inside a web browser. It uses the svgpan library, which is
+// embedded into the svgpan.JSSource variable.
+func massageSVG(svg string) string {
 	// Work around for dot bug which misses quoting some ampersands,
 	// resulting on unparsable SVG.
 	svg = strings.Replace(svg, "&;", "&amp;;", -1)
 
-	//Dot's SVG output is
+	// Dot's SVG output is
 	//
 	//    <svg width="___" height="___"
 	//     viewBox="___" xmlns=...>
 	//    <svg width="100%" height="100%"
 	//     xmlns=...>
 
-	//    <script type="text/ecmascript"><![CDATA[` ..$(svgPanJS)... `]]></script>`
+	//    <script type="text/ecmascript"><![CDATA[` ..$(svgpan.JSSource)... `]]></script>`
 	//    <g id="viewport" transform="translate(0,0)">
 	//    <g id="graph0" transform="...">
 	//    ...
 
 	if loc := graphID.FindStringIndex(svg); loc != nil {
 		svg = svg[:loc[0]] +
-			`<script type="text/ecmascript"><![CDATA[` + string(svgPanJS) + `]]></script>` +
+			`<script type="text/ecmascript"><![CDATA[` + string(svgpan.JSSource) + `]]></script>` +
 			`<g id="viewport" transform="scale(0.5,0.5) translate(0,0)">` +
 			svg[loc[0]:]
 	}

third_party/svgpan/LICENSE

+Copyright 2009-2017 Andrea Leofreddi <a.leofreddi@vleo.net>. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, are
+permitted provided that the following conditions are met:
+
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+   3. Neither the name of the copyright holder nor the names of its
+      contributors may be used to endorse or promote products derived from
+      this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
+OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The views and conclusions contained in the software and documentation are those of the
+authors and should not be interpreted as representing official policies, either expressed
+or implied, of Andrea Leofreddi.

third_party/svg/svgpan.go → third_party/svgpan/svgpan.go

 // SVG pan and zoom library.
 // See copyright notice in string constant below.
 
-package svg
+package svgpan
 
-// https://www.cyberz.org/projects/SVGPan/SVGPan.js
+// https://github.com/aleofreddi/svgpan
 
-const svgPanJS = `
-/** 
- *  SVGPan library 1.2.1
+// JSSource returns the svgpan.js file
+const JSSource = `
+/**
+ *  SVGPan library 1.2.2
  * ======================
  *
- * Given an unique existing element with id "viewport" (or when missing, the first g 
- * element), including the the library into any SVG adds the following capabilities:
+ * Given an unique existing element with id "viewport" (or when missing, the
+ * first g-element), including the the library into any SVG adds the following
+ * capabilities:
  *
  *  - Mouse panning
  *  - Mouse zooming (using the wheel)
  *
  * Releases:
  *
+ * 1.2.2, Tue Aug 30 17:21:56 CEST 2011, Andrea Leofreddi
+ *	- Fixed viewBox on root tag (#7)
+ *	- Improved zoom speed (#2)
+ *
  * 1.2.1, Mon Jul  4 00:33:18 CEST 2011, Andrea Leofreddi
  *	- Fixed a regression with mouse wheel (now working on Firefox 5)
  *	- Working with viewBox attribute (#4)
  *
  * This code is licensed under the following BSD license:
  *
- * Copyright 2009-2010 Andrea Leofreddi <a.leofreddi@itcharm.com>. All rights reserved.
- * 
+ * Copyright 2009-2017 Andrea Leofreddi <a.leofreddi@vleo.net>. All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without modification, are
  * permitted provided that the following conditions are met:
- * 
- *    1. Redistributions of source code must retain the above copyright notice, this list of
- *       conditions and the following disclaimer.
- * 
- *    2. Redistributions in binary form must reproduce the above copyright notice, this list
- *       of conditions and the following disclaimer in the documentation and/or other materials
- *       provided with the distribution.
- * 
- * THIS SOFTWARE IS PROVIDED BY Andrea Leofreddi ` + "``AS IS''" + ` AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
- * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Andrea Leofreddi OR
+ *
+ *    1. Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *    2. Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *    3. Neither the name of the copyright holder nor the names of its
+ *       contributors may be used to endorse or promote products derived from
+ *       this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * 
+ *
  * The views and conclusions contained in the software and documentation are those of the
  * authors and should not be interpreted as representing official policies, either expressed
  * or implied, of Andrea Leofreddi.
 
 "use strict";
 
-/// CONFIGURATION 
+/// CONFIGURATION
 /// ====>
 
 var enablePan = 1; // 1 or 0: enable or disable panning (default enabled)
 var enableZoom = 1; // 1 or 0: enable or disable zooming (default enabled)
 var enableDrag = 0; // 1 or 0: enable or disable dragging (default disabled)
+var zoomScale = 0.2; // Zoom sensitivity
 
 /// <====
-/// END OF CONFIGURATION 
+/// END OF CONFIGURATION
 
 var root = document.documentElement;
 
-var state = 'none', svgRoot, stateTarget, stateOrigin, stateTf;
+var state = 'none', svgRoot = null, stateTarget, stateOrigin, stateTf;
 
 setupHandlers(root);
 
  * Retrieves the root element for SVG manipulation. The element is then cached into the svgRoot global variable.
  */
 function getRoot(root) {
-	if(typeof(svgRoot) == "undefined") {
-		var g = null;
-
-		g = root.getElementById("viewport");
+	if(svgRoot == null) {
+		var r = root.getElementById("viewport") ? root.getElementById("viewport") : root.documentElement, t = r;
 
-		if(g == null)
-			g = root.getElementsByTagName('g')[0];
+		while(t != root) {
+			if(t.getAttribute("viewBox")) {
+				setCTM(r, t.getCTM());
 
-		if(g == null)
-			alert('Unable to obtain SVG root element');
+				t.removeAttribute("viewBox");
+			}
 
-		setCTM(g, g.getCTM());
+			t = t.parentNode;
+		}
 
-		g.removeAttribute("viewBox");
-
-		svgRoot = g;
+		svgRoot = r;
 	}
 
 	return svgRoot;
 	var delta;
 
 	if(evt.wheelDelta)
-		delta = evt.wheelDelta / 3600; // Chrome/Safari
+		delta = evt.wheelDelta / 360; // Chrome/Safari
 	else
-		delta = evt.detail / -90; // Mozilla
+		delta = evt.detail / -9; // Mozilla
 
-	var z = 1 + delta; // Zoom factor: 0.9/1.1
+	var z = Math.pow(1 + zoomScale, delta);
 
 	var g = getRoot(svgDoc);
 	
 	var g = getRoot(svgDoc);
 
 	if(
-		evt.target.tagName == "svg" 
-		|| !enableDrag // Pan anyway when drag is disabled and the user clicked on an element 
+		evt.target.tagName == "svg"
+		|| !enableDrag // Pan anyway when drag is disabled and the user clicked on an element
 	) {
 		// Pan mode
 		state = 'pan';
 		state = '';
 	}
 }
-
 `