007b38797b
This function is effectively the implementation of Variables for all expressions, but unfortunately we still need to declare a wrapper around it as a method on every single expression type.
76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
package zclsyntax
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import (
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"github.com/apparentlymart/go-cty/cty"
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"github.com/apparentlymart/go-zcl/zcl"
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)
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// Expression is the abstract type for nodes that behave as zcl expressions.
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type Expression interface {
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Node
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// The zcl.Expression methods are duplicated here, rather than simply
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// embedded, because both Node and zcl.Expression have a Range method
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// and so they conflict.
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Value(ctx *zcl.EvalContext) (cty.Value, zcl.Diagnostics)
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Variables() []zcl.Traversal
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StartRange() zcl.Range
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}
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// Assert that Expression implements zcl.Expression
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var assertExprImplExpr zcl.Expression = Expression(nil)
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// LiteralValueExpr is an expression that just always returns a given value.
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type LiteralValueExpr struct {
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Val cty.Value
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SrcRange zcl.Range
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}
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func (e *LiteralValueExpr) walkChildNodes(w internalWalkFunc) {
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// Literal values have no child nodes
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}
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func (e *LiteralValueExpr) Value(ctx *zcl.EvalContext) (cty.Value, zcl.Diagnostics) {
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return e.Val, nil
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}
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func (e *LiteralValueExpr) Range() zcl.Range {
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return e.SrcRange
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}
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func (e *LiteralValueExpr) StartRange() zcl.Range {
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return e.SrcRange
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}
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func (e *LiteralValueExpr) Variables() []zcl.Traversal {
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return Variables(e)
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}
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// ScopeTraversalExpr is an Expression that retrieves a value from the scope
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// using a traversal.
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type ScopeTraversalExpr struct {
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Traversal zcl.Traversal
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SrcRange zcl.Range
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}
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func (e *ScopeTraversalExpr) walkChildNodes(w internalWalkFunc) {
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// Scope traversals have no child nodes
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}
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func (e *ScopeTraversalExpr) Value(ctx *zcl.EvalContext) (cty.Value, zcl.Diagnostics) {
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panic("ScopeTraversalExpr.Value not yet implemented")
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}
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func (e *ScopeTraversalExpr) Range() zcl.Range {
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return e.SrcRange
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}
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func (e *ScopeTraversalExpr) StartRange() zcl.Range {
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return e.SrcRange
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}
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func (e *ScopeTraversalExpr) Variables() []zcl.Traversal {
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return Variables(e)
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}
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