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definition.go
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definition.go
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package parser
import (
"fmt"
"go/ast"
"github.com/livebud/bud/internal/gois"
)
// Definition looks a local definition up by name
// TODO: support more type definitions
func (pkg *Package) definition(name string) (decl Declaration, err error) {
if gois.Builtin(name) {
return builtin(name), nil
}
err = fmt.Errorf("parser: unable to find declaration for %q in %q", name, pkg.Name())
var file *File
var ts *ast.TypeSpec
ast.Inspect(pkg.node, func(node ast.Node) bool {
switch n := node.(type) {
case *ast.File:
file = pkg.File(n.Name.Name)
return true
case *ast.TypeSpec:
ts = n
if n.Name.Name != name {
return true
}
// Handle type spec
if n.Assign == 0 {
switch n.Type.(type) {
// Continue on if we find a struct or interface
case *ast.StructType, *ast.InterfaceType:
return true
default:
// Otherwise it's a generic type spec
decl = &TypeSpec{
file: file,
node: n,
}
err = nil
return false
}
}
// Handle type aliases
alias := &Alias{
file: file,
node: n,
}
resolved, err2 := alias.Definition()
if err2 != nil {
err = err2
return false
}
alias.kind = resolved.Kind()
decl = alias
err = nil
return false
case *ast.StructType:
if ts == nil || ts.Name.Name != name {
return true
}
decl = &Struct{
file: file,
ts: ts,
node: n,
}
err = nil
return false
case *ast.InterfaceType:
if ts == nil || ts.Name.Name != name {
return true
}
decl = &Interface{
file: file,
ts: ts,
node: n,
}
err = nil
return false
// TODO: support const and var
case *ast.ValueSpec:
}
return true
})
return decl, err
}