88 lines
2.7 KiB
Go
88 lines
2.7 KiB
Go
package hcl2shim
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import (
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"fmt"
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"math/big"
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"github.com/zclconf/go-cty/cty"
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)
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// UnknownVariableValue is a sentinel value that can be used
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// to denote that the value of a variable is unknown at this time.
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// RawConfig uses this information to build up data about
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// unknown keys.
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const UnknownVariableValue = "74D93920-ED26-11E3-AC10-0800200C9A66"
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// ConfigValueFromHCL2 converts a value from HCL2 (really, from the cty dynamic
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// types library that HCL2 uses) to a value type that matches what would've
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// been produced from the HCL-based interpolator for an equivalent structure.
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//
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// This function will transform a cty null value into a Go nil value, which
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// isn't a possible outcome of the HCL/HIL-based decoder and so callers may
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// need to detect and reject any null values.
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func ConfigValueFromHCL2(v cty.Value) interface{} {
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if !v.IsKnown() {
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return UnknownVariableValue
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}
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if v.IsNull() {
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return nil
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}
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switch v.Type() {
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case cty.Bool:
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return v.True() // like HCL.BOOL
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case cty.String:
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return v.AsString() // like HCL token.STRING or token.HEREDOC
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case cty.Number:
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// We can't match HCL _exactly_ here because it distinguishes between
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// int and float values, but we'll get as close as we can by using
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// an int if the number is exactly representable, and a float if not.
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// The conversion to float will force precision to that of a float64,
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// which is potentially losing information from the specific number
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// given, but no worse than what HCL would've done in its own conversion
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// to float.
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f := v.AsBigFloat()
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if i, acc := f.Int64(); acc == big.Exact {
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// if we're on a 32-bit system and the number is too big for 32-bit
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// int then we'll fall through here and use a float64.
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const MaxInt = int(^uint(0) >> 1)
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const MinInt = -MaxInt - 1
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if i <= int64(MaxInt) && i >= int64(MinInt) {
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return int(i) // Like HCL token.NUMBER
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}
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}
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f64, _ := f.Float64()
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return f64 // like HCL token.FLOAT
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}
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if v.Type().IsListType() || v.Type().IsSetType() || v.Type().IsTupleType() {
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l := make([]interface{}, 0, v.LengthInt())
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it := v.ElementIterator()
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for it.Next() {
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_, ev := it.Element()
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l = append(l, ConfigValueFromHCL2(ev))
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}
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return l
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}
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if v.Type().IsMapType() || v.Type().IsObjectType() {
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l := make(map[string]interface{})
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it := v.ElementIterator()
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for it.Next() {
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ek, ev := it.Element()
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cv := ConfigValueFromHCL2(ev)
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if cv != nil {
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l[ek.AsString()] = cv
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}
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}
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return l
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}
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// If we fall out here then we have some weird type that we haven't
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// accounted for. This should never happen unless the caller is using
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// capsule types, and we don't currently have any such types defined.
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panic(fmt.Errorf("can't convert %#v to config value", v))
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}
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