refactor(renderer): move context and switch/call to backends

[xcoulon]

move Context from pkg/renderer into pkg/renderer/sgml and make
it unexported, and refactor the way to run the renderer on the doc:

html5.Render(doc, config, out)

Signed-off-by: Xavier Coulon [email protected]

[codecov]

Codecov Report

Merging #1064 (b49592d) into master (9f09049) will increase coverage by 0.07%.
The diff coverage is 95.15%.

@@            Coverage Diff             @@
##           master    #1064      +/-   ##
==========================================
+ Coverage   81.32%   81.40%   +0.07%     
==========================================
  Files          85       87       +2     
  Lines        7454     7452       -2     
==========================================
+ Hits         6062     6066       +4     
+ Misses        876      871       -5     
+ Partials      516      515       -1     

[github-actions]

Comparing with master branch:

name                                          old time/op    new time/op    delta
RealDocumentProcessing/demo.adoc-2              25.1ms ± 2%    25.1ms ± 1%   ~     (p=0.605 n=9+9)
RealDocumentProcessing/vertx-examples.adoc-2    64.3ms ± 0%    64.4ms ± 1%   ~     (p=0.968 n=9+10)
RealDocumentProcessing/mocking.adoc-2           69.6ms ± 0%    69.5ms ± 0%   ~     (p=0.529 n=10+10)

name                                          old alloc/op   new alloc/op   delta
RealDocumentProcessing/demo.adoc-2              10.8MB ± 0%    10.8MB ± 0%   ~     (p=0.606 n=7+9)
RealDocumentProcessing/vertx-examples.adoc-2    27.2MB ± 0%    27.2MB ± 0%   ~     (p=0.280 n=10+10)
RealDocumentProcessing/mocking.adoc-2           25.0MB ± 0%    25.0MB ± 0%   ~     (p=0.968 n=9+10)

name                                          old allocs/op  new allocs/op  delta
RealDocumentProcessing/demo.adoc-2                126k ± 0%      126k ± 0%   ~     (p=0.626 n=7+9)
RealDocumentProcessing/vertx-examples.adoc-2      341k ± 0%      341k ± 0%   ~     (p=0.382 n=10+10)
RealDocumentProcessing/mocking.adoc-2             374k ± 0%      374k ± 0%   ~     (p=0.711 n=8+10)

Comparing with latest release:

name                                          old time/op    new time/op    delta
RealDocumentProcessing/demo.adoc-2              16.9ms ± 0%    25.1ms ± 1%  +48.13%  (p=0.000 n=8+9)
RealDocumentProcessing/vertx-examples.adoc-2    47.9ms ± 1%    64.4ms ± 1%  +34.32%  (p=0.000 n=9+10)
RealDocumentProcessing/mocking.adoc-2           47.3ms ± 1%    69.5ms ± 0%  +46.92%  (p=0.000 n=10+10)

name                                          old alloc/op   new alloc/op   delta
RealDocumentProcessing/demo.adoc-2              8.85MB ± 0%   10.82MB ± 0%  +22.23%  (p=0.000 n=10+9)
RealDocumentProcessing/vertx-examples.adoc-2    24.0MB ± 0%    27.2MB ± 0%  +13.39%  (p=0.000 n=9+10)
RealDocumentProcessing/mocking.adoc-2           21.6MB ± 0%    25.0MB ± 0%  +15.73%  (p=0.000 n=10+10)

name                                          old allocs/op  new allocs/op  delta
RealDocumentProcessing/demo.adoc-2                106k ± 0%      126k ± 0%  +18.83%  (p=0.000 n=10+9)
RealDocumentProcessing/vertx-examples.adoc-2      305k ± 0%      341k ± 0%  +11.72%  (p=0.000 n=10+10)
RealDocumentProcessing/mocking.adoc-2             326k ± 0%      374k ± 0%  +14.51%  (p=0.000 n=7+10)