go svg 源码
golang svg 代码
文件路径：/src/cmd/vendor/github.com/google/pprof/internal/driver/svg.go
// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package driver
import (
"regexp"
"strings"
"github.com/google/pprof/third_party/svgpan"
)
var (
viewBox = regexp.MustCompile(`<svg\s*width="[^"]+"\s*height="[^"]+"\s*viewBox="[^"]+"`)
graphID = regexp.MustCompile(`<g id="graph\d"`)
svgClose = regexp.MustCompile(`</svg>`)
)
// 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, "&;", "&;", -1)
// Dot's SVG output is
//
// <svg width="___" height="___"
// viewBox="___" xmlns=...>
// <g id="graph0" transform="...">
// ...
// </g>
// </svg>
//
// Change it to
//
// <svg width="100%" height="100%"
// xmlns=...>
// <script type="text/ecmascript"><![CDATA[` ..$(svgpan.JSSource)... `]]></script>`
// <g id="viewport" transform="translate(0,0)">
// <g id="graph0" transform="...">
// ...
// </g>
// </g>
// </svg>
if loc := viewBox.FindStringIndex(svg); loc != nil {
svg = svg[:loc[0]] +
`<svg width="100%" height="100%"` +
svg[loc[1]:]
}
if loc := graphID.FindStringIndex(svg); loc != nil {
svg = svg[:loc[0]] +
`<script type="text/ecmascript"><![CDATA[` + string(svgpan.JSSource) + `]]></script>` +
`<g id="viewport" transform="scale(0.5,0.5) translate(0,0)">` +
svg[loc[0]:]
}
if loc := svgClose.FindStringIndex(svg); loc != nil {
svg = svg[:loc[0]] +
`</g>` +
svg[loc[0]:]
}
return svg
}
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