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This is a first pass of decoding of the main Terraform configuration file format. It hasn't yet been tested with any real-world configurations, so it will need to be revised further as we test it more thoroughly.
62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
package configs
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import (
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"fmt"
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version "github.com/hashicorp/go-version"
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"github.com/hashicorp/hcl2/hcl"
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"github.com/zclconf/go-cty/cty"
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"github.com/zclconf/go-cty/cty/convert"
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)
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// VersionConstraint represents a version constraint on some resource
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// (e.g. Terraform Core, a provider, a module, ...) that carries with it
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// a source range so that a helpful diagnostic can be printed in the event
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// that a particular constraint does not match.
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type VersionConstraint struct {
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Required version.Constraints
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DeclRange hcl.Range
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}
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func decodeVersionConstraint(attr *hcl.Attribute) (VersionConstraint, hcl.Diagnostics) {
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ret := VersionConstraint{
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DeclRange: attr.Range,
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}
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val, diags := attr.Expr.Value(nil)
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var err error
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val, err = convert.Convert(val, cty.String)
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if err != nil {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid version constraint",
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Detail: fmt.Sprintf("A string value is required for %s.", attr.Name),
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Subject: attr.Expr.Range().Ptr(),
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})
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return ret, diags
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}
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if val.IsNull() {
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// A null version constraint is strange, but we'll just treat it
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// like an empty constraint set.
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return ret, diags
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}
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constraintStr := val.AsString()
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constraints, err := version.NewConstraint(constraintStr)
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if err != nil {
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// NewConstraint doesn't return user-friendly errors, so we'll just
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// ignore the provided error and produce our own generic one.
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Invalid version constraint",
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Detail: "This string does not use correct version constraint syntax.", // Not very actionable :(
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Subject: attr.Expr.Range().Ptr(),
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})
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return ret, diags
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}
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ret.Required = constraints
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return ret, diags
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}
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