HCL uses grapheme cluster segmentation to produce accurate "column"
indications in diagnostic messages and other human-oriented source
location information. Each new major version of Unicode introduces new
codepoints, some of which are defined to combine with other codepoints to
produce a single visible character (grapheme cluster).
We were previously using the rules from Unicode 9.0.0. This change
switches to using the segmentation rules from Unicode 12.0.0, which is
the latest version at the time of this commit and is also the version of
Unicode used for other purposes by the Go 1.14 runtime.
HCL does not use text segmentation results for any purpose that would
affect the meaning of decoded data extracted from HCL files, so this
change will only affect the human-oriented source positions generated for
files containing characters that were newly-introduced in Unicode 10, 11,
or 12. (Machine-oriented uses of source location information are based on
byte offsets and not affected by text segmentation.)
This includes a new feature to allow extension properties associated with
capsule types, which HCL can in turn use to allow certain capsule types
to opt in to special handing at the HCL layer.
(There are no such hooks in use as of this commit, however.)
This patch release includes a couple small bug fixes that don't affect HCL
directly, and a slight improvement to error messages for failed
conversions from boolean to string.
The primary goal of this upgrade is to ratchet dependents on HCL up to the
newer version of cty in order to get those improved error messages, but
during upgrading they may also benefit from the other bug fixes.
This introduces only some minor bugfixes compared to the commit we
selected before; the main goal here is to be on an actual tagged release
rather than an arbitrary commit.
The TemplateStringLiteral production was not quite right, causing a
literal $ or % immediately followed by " to consume the quotes and any
following characters on the line if there were any more characters on the
line.
Now we match things more precisely, but at the expense of generating some
redundant extra tokens when escapes and literal dollar/percent signs are
present. Those extra tokens don't matter in practice because the resulting
strings get concatenated together anyway, which is proven by the fact
that this changeset includes changes only to the scanner and parser tests,
and not to any of the expression result tests.
While here, I also improved the error message for when the user attempts
to split a quoted string over multiple lines. Previously it was just using
the generic "invalid character" message, which isn't particularly
actionable. Now we'll give the user a couple options of what to do
instead.
This includes a new function cty.ParseNumberVal which centralizes the
standard way to produce a cty.Number from a string so we can be sure to
always get comparable numbers.
* Add tests to cover new behavior introduced in cty
Convert should now not convert null to DynamicPseudoType, and Equals
will always compare Nulls as equal.
* update go.mod
However, since this repository is only a temporary home for this module,
the go.mod file carries a warning to that effect. It will move to its more
permanent home as it transitions from experimental to released.
