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A pattern has emerged of wrapping Expression instances with other Expressions in order to subtly modify their behavior. A key example of this is in ext/dynblock, where wrap an expression in order to introduce our additional iteration variable for expressions in dynamic blocks. Rather than having each wrapper expression implement wrapping implementations for our various syntax-level-analysis functions (like ExprList and AbsTraversalForExpr), instead we define a standard mechanism to unwrap expressions back to the lowest-level object -- usually an AST node -- and then use this in all of our analyses that look at the expression's structure rather than its value. |
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| transform | ||
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| README.md | ||
HCL Extensions
This directory contains some packages implementing some extensions to HCL
that add features by building on the core API in the main hcl package.
These serve as optional language extensions for use-cases that are limited only to specific callers. Generally these make the language more expressive at the expense of increased dynamic behavior that may be undesirable for applications that need to impose more rigid structure on configuration.