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* [COMPLIANCE] Add Copyright and License Headers
* add copywrite file and revert headers in testdata
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Co-authored-by: hashicorp-copywrite[bot] <110428419+hashicorp-copywrite[bot]@users.noreply.github.com>
Co-authored-by: Liam Cervante <liam.cervante@hashicorp.com>
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The "TokensFor..." family of functions all aim to construct valid
raw token sequences representing particular syntax constructs.
Previously we had only "leaf" functions TokensForValue and
TokensForTraversal, but nothing to help with constructing compound
structures.
Here we add TokensForTuple, TokensForObject, and
TokensForFunctionCall which together cover all of the constructs
that HCL allows static analysis of, and thus constructs where it's
likely that someone would want to generate an expression that
is interpreted purely by its syntax and not resolved into a value.
What all of these have in common is that they take other Tokens
values as arguments and include them verbatim as part of their
result, with the caller being responsible for making sure these
smaller units are themselves valid expression tokens.
This also adds TokensForIdentifier as a convenient shorthand for
generating single-identifier tokens, which is particularly useful
for populating the attribute names in TokensForObject.
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The previous syntax for object and map values was a single line of
key-value pairs. For example:
object = { bar = 5, baz = true, foo = "foo" }
This is very compact, but in practice for many HCL values, less readable
and less common than a multi-line object format. This commit changes the
generated output from hclwrite to one line per attribute.
Examples of the new format:
// Empty object/map is a single line
a = {}
// Single-value object/map has the attribute on a separate line
b = {
bar = 5
}
// Multi-value object/map has one line per attribute
c = {
bar = 5
baz = true
}
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The main HCL package is more visible this way, and so it's easier than
having to pick it out from dozens of other package directories.
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This is in preparation for the first v2 release from the main HCL
repository.
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This function produces a token stream of a reasonable source
representation of the given constant value.
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