1 files changed, 187 insertions, 0 deletions

diff --git a/vendor/github.com/hashicorp/terraform/lang/blocktoattr/fixup.go b/vendor/github.com/hashicorp/terraform/lang/blocktoattr/fixup.go
new file mode 100644
index 0000000..d8c2e77
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/lang/blocktoattr/fixup.go
@@ -0,0 +1,187 @@
+package blocktoattr
+
+import (
+        "github.com/hashicorp/hcl2/hcl"
+        "github.com/hashicorp/hcl2/hcldec"
+        "github.com/hashicorp/terraform/configs/configschema"
+        "github.com/zclconf/go-cty/cty"
+)
+
+// FixUpBlockAttrs takes a raw HCL body and adds some additional normalization
+// functionality to allow attributes that are specified as having list or set
+// type in the schema to be written with HCL block syntax as multiple nested
+// blocks with the attribute name as the block type.
+//
+// This partially restores some of the block/attribute confusion from HCL 1
+// so that existing patterns that depended on that confusion can continue to
+// be used in the short term while we settle on a longer-term strategy.
+//
+// Most of the fixup work is actually done when the returned body is
+// subsequently decoded, so while FixUpBlockAttrs always succeeds, the eventual
+// decode of the body might not, if the content of the body is so ambiguous
+// that there's no safe way to map it to the schema.
+func FixUpBlockAttrs(body hcl.Body, schema *configschema.Block) hcl.Body {
+        // The schema should never be nil, but in practice it seems to be sometimes
+        // in the presence of poorly-configured test mocks, so we'll be robust
+        // by synthesizing an empty one.
+        if schema == nil {
+                schema = &configschema.Block{}
+        }
+
+        return &fixupBody{
+                original: body,
+                schema:   schema,
+                names:    ambiguousNames(schema),
+        }
+}
+
+type fixupBody struct {
+        original hcl.Body
+        schema   *configschema.Block
+        names    map[string]struct{}
+}
+
+// Content decodes content from the body. The given schema must be the lower-level
+// representation of the same schema that was previously passed to FixUpBlockAttrs,
+// or else the result is undefined.
+func (b *fixupBody) Content(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Diagnostics) {
+        schema = b.effectiveSchema(schema)
+        content, diags := b.original.Content(schema)
+        return b.fixupContent(content), diags
+}
+
+func (b *fixupBody) PartialContent(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Body, hcl.Diagnostics) {
+        schema = b.effectiveSchema(schema)
+        content, remain, diags := b.original.PartialContent(schema)
+        remain = &fixupBody{
+                original: remain,
+                schema:   b.schema,
+                names:    b.names,
+        }
+        return b.fixupContent(content), remain, diags
+}
+
+func (b *fixupBody) JustAttributes() (hcl.Attributes, hcl.Diagnostics) {
+        // FixUpBlockAttrs is not intended to be used in situations where we'd use
+        // JustAttributes, so we just pass this through verbatim to complete our
+        // implementation of hcl.Body.
+        return b.original.JustAttributes()
+}
+
+func (b *fixupBody) MissingItemRange() hcl.Range {
+        return b.original.MissingItemRange()
+}
+
+// effectiveSchema produces a derived *hcl.BodySchema by sniffing the body's
+// content to determine whether the author has used attribute or block syntax
+// for each of the ambigious attributes where both are permitted.
+//
+// The resulting schema will always contain all of the same names that are
+// in the given schema, but some attribute schemas may instead be replaced by
+// block header schemas.
+func (b *fixupBody) effectiveSchema(given *hcl.BodySchema) *hcl.BodySchema {
+        return effectiveSchema(given, b.original, b.names, true)
+}
+
+func (b *fixupBody) fixupContent(content *hcl.BodyContent) *hcl.BodyContent {
+        var ret hcl.BodyContent
+        ret.Attributes = make(hcl.Attributes)
+        for name, attr := range content.Attributes {
+                ret.Attributes[name] = attr
+        }
+        blockAttrVals := make(map[string][]*hcl.Block)
+        for _, block := range content.Blocks {
+                if _, exists := b.names[block.Type]; exists {
+                        // If we get here then we've found a block type whose instances need
+                        // to be re-interpreted as a list-of-objects attribute. We'll gather
+                        // those up and fix them up below.
+                        blockAttrVals[block.Type] = append(blockAttrVals[block.Type], block)
+                        continue
+                }
+
+                // We need to now re-wrap our inner body so it will be subject to the
+                // same attribute-as-block fixup when recursively decoded.
+                retBlock := *block // shallow copy
+                if blockS, ok := b.schema.BlockTypes[block.Type]; ok {
+                        // Would be weird if not ok, but we'll allow it for robustness; body just won't be fixed up, then
+                        retBlock.Body = FixUpBlockAttrs(retBlock.Body, &blockS.Block)
+                }
+
+                ret.Blocks = append(ret.Blocks, &retBlock)
+        }
+        // No we'll install synthetic attributes for each of our fixups. We can't
+        // do this exactly because HCL's information model expects an attribute
+        // to be a single decl but we have multiple separate blocks. We'll
+        // approximate things, then, by using only our first block for the source
+        // location information. (We are guaranteed at least one by the above logic.)
+        for name, blocks := range blockAttrVals {
+                ret.Attributes[name] = &hcl.Attribute{
+                        Name: name,
+                        Expr: &fixupBlocksExpr{
+                                blocks: blocks,
+                                ety:    b.schema.Attributes[name].Type.ElementType(),
+                        },
+
+                        Range:     blocks[0].DefRange,
+                        NameRange: blocks[0].TypeRange,
+                }
+        }
+        return &ret
+}
+
+type fixupBlocksExpr struct {
+        blocks hcl.Blocks
+        ety    cty.Type
+}
+
+func (e *fixupBlocksExpr) Value(ctx *hcl.EvalContext) (cty.Value, hcl.Diagnostics) {
+        // In order to produce a suitable value for our expression we need to
+        // now decode the whole descendent block structure under each of our block
+        // bodies.
+        //
+        // That requires us to do something rather strange: we must construct a
+        // synthetic block type schema derived from the element type of the
+        // attribute, thus inverting our usual direction of lowering a schema
+        // into an implied type. Because a type is less detailed than a schema,
+        // the result is imprecise and in particular will just consider all
+        // the attributes to be optional and let the provider eventually decide
+        // whether to return errors if they turn out to be null when required.
+        schema := SchemaForCtyElementType(e.ety) // this schema's ImpliedType will match e.ety
+        spec := schema.DecoderSpec()
+
+        vals := make([]cty.Value, len(e.blocks))
+        var diags hcl.Diagnostics
+        for i, block := range e.blocks {
+                body := FixUpBlockAttrs(block.Body, schema)
+                val, blockDiags := hcldec.Decode(body, spec, ctx)
+                diags = append(diags, blockDiags...)
+                if val == cty.NilVal {
+                        val = cty.UnknownVal(e.ety)
+                }
+                vals[i] = val
+        }
+        if len(vals) == 0 {
+                return cty.ListValEmpty(e.ety), diags
+        }
+        return cty.ListVal(vals), diags
+}
+
+func (e *fixupBlocksExpr) Variables() []hcl.Traversal {
+        var ret []hcl.Traversal
+        schema := SchemaForCtyElementType(e.ety)
+        spec := schema.DecoderSpec()
+        for _, block := range e.blocks {
+                ret = append(ret, hcldec.Variables(block.Body, spec)...)
+        }
+        return ret
+}
+
+func (e *fixupBlocksExpr) Range() hcl.Range {
+        // This is not really an appropriate range for the expression but it's
+        // the best we can do from here.
+        return e.blocks[0].DefRange
+}
+
+func (e *fixupBlocksExpr) StartRange() hcl.Range {
+        return e.blocks[0].DefRange
+}