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This is a helper for splitting a non-root module path into a callee and call pair, similar to the method of the same name on ModuleInstance.
76 lines
2.4 KiB
Go
76 lines
2.4 KiB
Go
package addrs
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import (
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"strings"
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)
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// Module is an address for a module call within configuration. This is
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// the static counterpart of ModuleInstance, representing a traversal through
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// the static module call tree in configuration and does not take into account
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// the potentially-multiple instances of a module that might be created by
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// "count" and "for_each" arguments within those calls.
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//
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// This type should be used only in very specialized cases when working with
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// the static module call tree. Type ModuleInstance is appropriate in more cases.
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//
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// Although Module is a slice, it should be treated as immutable after creation.
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type Module []string
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// RootModule is the module address representing the root of the static module
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// call tree, which is also the zero value of Module.
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//
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// Note that this is not the root of the dynamic module tree, which is instead
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// represented by RootModuleInstance.
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var RootModule Module
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// IsRoot returns true if the receiver is the address of the root module,
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// or false otherwise.
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func (m Module) IsRoot() bool {
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return len(m) == 0
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}
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func (m Module) String() string {
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if len(m) == 0 {
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return ""
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}
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return strings.Join([]string(m), ".")
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}
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// Child returns the address of a child call in the receiver, identified by the
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// given name.
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func (m Module) Child(name string) Module {
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ret := make(Module, 0, len(m)+1)
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ret = append(ret, m...)
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return append(ret, name)
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}
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// Parent returns the address of the parent module of the receiver, or the
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// receiver itself if there is no parent (if it's the root module address).
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func (m Module) Parent() Module {
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if len(m) == 0 {
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return m
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}
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return m[:len(m)-1]
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}
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// Call returns the module call address that corresponds to the given module
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// instance, along with the address of the module that contains it.
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//
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// There is no call for the root module, so this method will panic if called
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// on the root module address.
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//
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// In practice, this just turns the last element of the receiver into a
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// ModuleCall and then returns a slice of the receiever that excludes that
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// last part. This is just a convenience for situations where a call address
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// is required, such as when dealing with *Reference and Referencable values.
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func (m Module) Call() (Module, ModuleCall) {
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if len(m) == 0 {
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panic("cannot produce ModuleCall for root module")
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}
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caller, callName := m[:len(m)-1], m[len(m)-1]
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return caller, ModuleCall{
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Name: callName,
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}
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}
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