// evalCtxPathExpression evaluates a context path expression
func (v *evalVisitor) evalCtxPathExpression(node *ast.PathExpression, exprRoot bool) interface{} {
v.at(node)
if node.IsDataRoot() {
// `@root` - remove the first part
parts := node.Parts[1:len(node.Parts)]
result, _ := v.evalCtxPath(v.rootCtx(), parts, exprRoot)
return result
}
return v.evalDepthPath(node.Depth, node.Parts, exprRoot)
}
// evalPathExpression evaluates a path expression
func (v *evalVisitor) evalPathExpression(node *ast.PathExpression, exprRoot bool) interface{} {
var result interface{}
if name, value := v.findBlockParam(node); value != nil {
// block parameter value
// We push a new context so we can evaluate the path expression (note: this may be a bad idea).
//
// Example:
// {{#foo as |bar|}}
// {{bar.baz}}
// {{/foo}}
//
// With data:
// {"foo": {"baz": "bat"}}
newCtx := map[string]interface{}{name: value}
v.pushCtx(reflect.ValueOf(newCtx))
result = v.evalCtxPathExpression(node, exprRoot)
v.popCtx()
} else {
ctxTried := false
if node.IsDataRoot() {
// context path
result = v.evalCtxPathExpression(node, exprRoot)
ctxTried = true
}
if (result == nil) && node.Data {
// if it is @root, then we tried to evaluate with root context but nothing was found
// so let's try with private data
// private data
result = v.evalDataPathExpression(node, exprRoot)
}
if (result == nil) && !ctxTried {
// context path
result = v.evalCtxPathExpression(node, exprRoot)
}
}
return result
}