Token detection was broken for conditional and for expressions that
represent template control sequences. The code originally attempted to
determine whether or not a conditional or for expression was a control
sequence by inspecting the expression's parent. Unfortunately, that
approach is unable to distinguish between expressions that are control
sequences and those that are merely template parts. These changes
instead inspect the first token of the expression for a template control
token (i.e. `%{`): if such a token is found, the expression is detected
as a template control sequence.
- Parentheses were not handled properly
- Literals inside of template control sequences were not handled
properly
These changes also improve test coverage for the printers.
These changes add a package for type checking and modeling HCL2
configurations. It is made up of three primary components:
1. A static type system
2. A semantic representation of HCL2 expressions and a binder from HCL2
native syntax to this representation
3. A semantic representation of HCL2 structural elements and binders
from HCL2 native syntax to this representation.
The type system is described in the "Extended Types" section of the
specification. The semantic representations of expressions and
structural elements are documented in their implementations.
These changes add a helper package for parsing HCL2 syntax files. The
helpers are intended to provide direct access to syntax elements that
are abstracted away by the standard HCL2 parser. The bulk of the code
deals with mapping syntax nodes to their relevant tokens in order to
avoid losing information about the comments associated with syntax
nodes.