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Add support for provider-contributed functions
Follow up of hashicorp/terraform#34394
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| ${core::templatefile("recursive_namespaced.tmpl", {})} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| package lang | ||
|
|
||
| import ( | ||
| "strings" | ||
|
|
||
| "github.com/hashicorp/hcl/v2" | ||
| "github.com/hashicorp/hcl/v2/hclsyntax" | ||
| "github.com/hashicorp/hcl/v2/json" | ||
| "github.com/zclconf/go-cty/cty" | ||
| ) | ||
|
|
||
| // FunctionCall represents a function call in an HCL expression. | ||
| // The difference with hclsyntax.FunctionCallExpr is that | ||
| // function calls are also available in JSON syntax. | ||
| type FunctionCall struct { | ||
| Name string | ||
| ArgsCount int | ||
| } | ||
|
|
||
| // FunctionCallsInExpr finds all of the function calls in the given expression. | ||
| func FunctionCallsInExpr(expr hcl.Expression) ([]*FunctionCall, hcl.Diagnostics) { | ||
| if expr == nil { | ||
| return nil, nil | ||
| } | ||
|
|
||
| // For JSON syntax, walker is not implemented, | ||
| // so extract the hclsyntax.Node that we can walk on. | ||
| // See https://github.com/hashicorp/hcl/issues/543 | ||
| nodes, diags := walkableNodesInExpr(expr) | ||
| ret := []*FunctionCall{} | ||
|
|
||
| for _, node := range nodes { | ||
| visitDiags := hclsyntax.VisitAll(node, func(n hclsyntax.Node) hcl.Diagnostics { | ||
| if funcCallExpr, ok := n.(*hclsyntax.FunctionCallExpr); ok { | ||
| ret = append(ret, &FunctionCall{ | ||
| Name: funcCallExpr.Name, | ||
| ArgsCount: len(funcCallExpr.Args), | ||
| }) | ||
| } | ||
| return nil | ||
| }) | ||
| diags = diags.Extend(visitDiags) | ||
| } | ||
| return ret, diags | ||
| } | ||
|
|
||
| // IsProviderContributed returns true if the function is provider-contributed. | ||
| func (f *FunctionCall) IsProviderContributed() bool { | ||
| return strings.HasPrefix(f.Name, "provider::") | ||
| } | ||
|
|
||
| // walkableNodesInExpr returns hclsyntax.Node from the given expression. | ||
| // If the expression is an hclsyntax expression, it is returned as is. | ||
| // If the expression is a JSON expression, it is parsed and | ||
| // hclsyntax.Node it contains is returned. | ||
| func walkableNodesInExpr(expr hcl.Expression) ([]hclsyntax.Node, hcl.Diagnostics) { | ||
| nodes := []hclsyntax.Node{} | ||
|
|
||
| expr = hcl.UnwrapExpressionUntil(expr, func(expr hcl.Expression) bool { | ||
| _, native := expr.(hclsyntax.Expression) | ||
| return native || json.IsJSONExpression(expr) | ||
| }) | ||
| if expr == nil { | ||
| return nil, nil | ||
| } | ||
|
|
||
| if json.IsJSONExpression(expr) { | ||
| // HACK: For JSON expressions, we can get the JSON value as a literal | ||
| // without any prior HCL parsing by evaluating it in a nil context. | ||
| // We can take advantage of this property to walk through cty.Value | ||
| // that may contain HCL expressions instead of walking through | ||
| // expression nodes directly. | ||
| // See https://github.com/hashicorp/hcl/issues/642 | ||
| val, diags := expr.Value(nil) | ||
| if diags.HasErrors() { | ||
| return nodes, diags | ||
| } | ||
|
|
||
| err := cty.Walk(val, func(path cty.Path, v cty.Value) (bool, error) { | ||
| if v.Type() != cty.String || v.IsNull() || !v.IsKnown() { | ||
| return true, nil | ||
| } | ||
|
|
||
| node, parseDiags := hclsyntax.ParseTemplate([]byte(v.AsString()), expr.Range().Filename, expr.Range().Start) | ||
| if diags.HasErrors() { | ||
| diags = diags.Extend(parseDiags) | ||
| return true, nil | ||
| } | ||
|
|
||
| nodes = append(nodes, node) | ||
| return true, nil | ||
| }) | ||
| if err != nil { | ||
| return nodes, hcl.Diagnostics{{ | ||
| Severity: hcl.DiagError, | ||
| Summary: "Failed to walk the expression value", | ||
| Detail: err.Error(), | ||
| Subject: expr.Range().Ptr(), | ||
| }} | ||
| } | ||
|
|
||
| return nodes, diags | ||
| } | ||
|
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| // The JSON syntax is already processed, so it's guaranteed to be native syntax. | ||
| nodes = append(nodes, expr.(hclsyntax.Expression)) | ||
|
|
||
| return nodes, nil | ||
| } |
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