code review 13327043: text/template: allow {{else if ... }} to simplify if chains

text/template: allow {{else if ... }} to simplify if chains
The method is simple: the parser just parses

        {{if A}}a{{else if B}}b{{end}}

to the same tree that would be produced by

        {{if A}}a{{else}}{{if B}}b{{end}}{{end}}

Thus no changes are required in text/template itself
or in html/template, only in text/template/parse.

Fixes issue 6085

[r, 2013-08-28 04:32:18]

Hello golang-dev@googlegroups.com,

I'd like you to review this change to
https://code.google.com/p/go/

[adg, 2013-08-28 04:39:31]

LGTM

[r, 2013-08-28 04:44:06]

*** Submitted as https://code.google.com/p/go/source/detail?r=0ff127f41a08 ***

text/template: allow {{else if ... }} to simplify if chains
The method is simple: the parser just parses

        {{if A}}a{{else if B}}b{{end}}

to the same tree that would be produced by

        {{if A}}a{{else}}{{if B}}b{{end}}{{end}}

Thus no changes are required in text/template itself
or in html/template, only in text/template/parse.

Fixes issue 6085

R=golang-dev, adg
CC=golang-dev
https://codereview.appspot.com/13327043