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zclwrite: start to stub out the mutation API

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These new stub methods will allow dealing with attributes within a body.
This commit is contained in:
Martin Atkins 2017-06-09 08:31:14 -07:00
parent 5477fecfad
commit a523846abd
1 changed files with 38 additions and 0 deletions
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38
zclwrite/ast.go
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@ -3,6 +3,9 @@ package zclwrite
import (
"bytes"
"io"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-zcl/zcl"
)
type Node interface {
@ -75,6 +78,41 @@ func (n *Body) AppendUnstructuredTokens(seq *TokenSeq) {
*(n.AllTokens) = append(*(n.AllTokens), seq)
}
// FindAttribute returns the first attribute item from the body that has the
// given name, or returns nil if there is currently no matching attribute.
//
// A valid AST has only one definition of each attribute, but that constraint
// is not enforced in the zclwrite AST, so a tree that has been mutated by
// other calls may contain additional matching attributes that cannot be seen
// by this method.
func (n *Body) FindAttribute(name string) *Attribute {
panic("Body.FindAttribute not yet implemented")
}
// SetAttributeValue either replaces the expression of an existing attribute
// of the given name or adds a new attribute definition to the end of the block.
//
// The value is given as a cty.Value, and must therefore be a literal. To set
// a variable reference or other traversal, use SetAttributeTraversal.
//
// The return value is the attribute that was either modified in-place or
// created.
func (n *Body) SetAttributeValue(name string, val cty.Value) *Attribute {
panic("Body.SetAttributeValue not yet implemented")
}
// SetAttributeTraversal either replaces the expression of an existing attribute
// of the given name or adds a new attribute definition to the end of the block.
//
// The new expression is given as a zcl.Traversal, which must be an absolute
// traversal. To set a literal value, use SetAttributeValue.
//
// The return value is the attribute that was either modified in-place or
// created.
func (n *Body) SetAttributeTraversal(name string, traversal zcl.Traversal) *Attribute {
panic("Body.SetAttributeTraversal not yet implemented")
}
type Attribute struct {
AllTokens *TokenSeq