code review 5143048: exp/template/html: do not escape the RHS of assignments

exp/template/html: do not escape the RHS of assignments

In

  {{$x := . | foo}}
  {{$x}}

the first action is a variable assignment that contributes
nothing to the output while the first is a use that needs
to be escaped.

This CL fixes escapeAction to distinguish assignments from
interpolations and to only modify interpolations.

[MikeSamuel, 2011-09-27 20:02:06]

Hello nigeltao@golang.org (cc: golang-dev@googlegroups.com),

I'd like you to review this change to
https://go.googlecode.com/hg/

[r, 2011-09-27 23:22:45]

LGTM

[MikeSamuel, 2011-09-28 05:08:18]

*** Submitted as http://code.google.com/p/go/source/detail?r=6c5c19791fae ***

exp/template/html: do not escape the RHS of assignments

In

  {{$x := . | foo}}
  {{$x}}

the first action is a variable assignment that contributes
nothing to the output while the first is a use that needs
to be escaped.

This CL fixes escapeAction to distinguish assignments from
interpolations and to only modify interpolations.

R=nigeltao, r
CC=golang-dev
http://codereview.appspot.com/5143048