119 lines
3.1 KiB
Go
119 lines
3.1 KiB
Go
package configs
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import (
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"fmt"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/hcl/v2/hclsyntax"
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"github.com/zclconf/go-cty/cty"
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)
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// SynthBody produces a synthetic hcl.Body that behaves as if it had attributes
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// corresponding to the elements given in the values map.
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//
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// This is useful in situations where, for example, values provided on the
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// command line can override values given in configuration, using MergeBodies.
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//
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// The given filename is used in case any diagnostics are returned. Since
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// the created body is synthetic, it is likely that this will not be a "real"
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// filename. For example, if from a command line argument it could be
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// a representation of that argument's name, such as "-var=...".
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func SynthBody(filename string, values map[string]cty.Value) hcl.Body {
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return synthBody{
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Filename: filename,
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Values: values,
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}
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}
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type synthBody struct {
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Filename string
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Values map[string]cty.Value
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}
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func (b synthBody) Content(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Diagnostics) {
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content, remain, diags := b.PartialContent(schema)
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remainS := remain.(synthBody)
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for name := range remainS.Values {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Unsupported attribute",
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Detail: fmt.Sprintf("An attribute named %q is not expected here.", name),
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Subject: b.synthRange().Ptr(),
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})
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}
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return content, diags
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}
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func (b synthBody) PartialContent(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Body, hcl.Diagnostics) {
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var diags hcl.Diagnostics
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content := &hcl.BodyContent{
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Attributes: make(hcl.Attributes),
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MissingItemRange: b.synthRange(),
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}
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remainValues := make(map[string]cty.Value)
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for attrName, val := range b.Values {
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remainValues[attrName] = val
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}
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for _, attrS := range schema.Attributes {
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delete(remainValues, attrS.Name)
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val, defined := b.Values[attrS.Name]
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if !defined {
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if attrS.Required {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Missing required attribute",
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Detail: fmt.Sprintf("The attribute %q is required, but no definition was found.", attrS.Name),
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Subject: b.synthRange().Ptr(),
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})
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}
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continue
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}
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content.Attributes[attrS.Name] = b.synthAttribute(attrS.Name, val)
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}
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// We just ignore blocks altogether, because this body type never has
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// nested blocks.
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remain := synthBody{
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Filename: b.Filename,
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Values: remainValues,
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}
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return content, remain, diags
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}
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func (b synthBody) JustAttributes() (hcl.Attributes, hcl.Diagnostics) {
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ret := make(hcl.Attributes)
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for name, val := range b.Values {
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ret[name] = b.synthAttribute(name, val)
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}
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return ret, nil
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}
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func (b synthBody) MissingItemRange() hcl.Range {
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return b.synthRange()
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}
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func (b synthBody) synthAttribute(name string, val cty.Value) *hcl.Attribute {
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rng := b.synthRange()
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return &hcl.Attribute{
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Name: name,
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Expr: &hclsyntax.LiteralValueExpr{
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Val: val,
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SrcRange: rng,
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},
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NameRange: rng,
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Range: rng,
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}
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}
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func (b synthBody) synthRange() hcl.Range {
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return hcl.Range{
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Filename: b.Filename,
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Start: hcl.Pos{Line: 1, Column: 1},
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End: hcl.Pos{Line: 1, Column: 1},
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}
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}
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