77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
package types
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import (
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"fmt"
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)
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var (
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Debug bool = false
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)
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func Parse(s string) *Node {
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_, n2 := TypeName(s,NewNode("AST"))
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return n2
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}
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//Evaluate a node to determine if it is a pointer or array
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func (n *Node) isAbstract(k string) bool {
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if n.stripAbstract(k) == nil {
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return false
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}
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return true
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}
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//Strip one level of pointer or array indirection from a node
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func (n *Node) stripAbstract(k string) *Node {
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i := len(n.Children) - 1
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if i < 1 {
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return nil
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}
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ret := NewNode(n.Kind)
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cs := n.Children[:]
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fmt.Printf("stripAbstract(): i = %d\n",i)
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//Scan backwords skipping NullableAnnotation tags
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for ;i > 0 && cs[i].Kind == "NullableAnnotation"; i-- { }
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if cs[i].Kind == k {
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fmt.Printf("stripAbstract(): last node is %s\n",k)
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ret.Children = cs[:i]
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return ret
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}
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if i > 1 && cs[i-1].Kind == "Parenthesized" {
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j := len(cs[i-1].Children) - 1
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//Scan backwards skipping TypeQualifier tags
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for ;j > 0 && cs[i-1].Children[j].Kind == "TypeQualifier"; j-- { }
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if cs[i-1].Children[j].Kind != k {
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return nil
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}
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if j == 0 { // strip Parenthesized tag
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cs[i-1] = cs[i]
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ret.Children = cs[:i]
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return ret
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}
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// strip last child from Parenthesized tag
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cs[i-1].Children = cs[i-1].Children[:j]
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ret.Children = cs
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return ret
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}
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return nil
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}
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//PointsTo, when called on a pointer node returns a node describing the type
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//pointed to. Otherwise returns nil when called on non-pointer types.
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func (n *Node) PointsTo() *Node {
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fmt.Printf("PointsTo()\n")
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return n.stripAbstract("Pointer")
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}
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//ArrayOf, when called on an array node returns a node describing the type
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//of the elements of the array. Otherwise returns nil when called on
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//non-array types.
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func (n *Node) ArrayOf() *Node {
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fmt.Printf("ArrayOf()\n")
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return n.stripAbstract("Array")
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}
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