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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
package exports
import (
"fmt"
"go/ast"
"strings"
)
// Content defines the set of exported constants, funcs, and structs.
type Content struct {
// the list of exported constants.
// key is the exported name, value is its type and value.
Consts map[string]Const `json:"consts,omitempty"`
// the list of exported functions and methods.
// key is the exported name, for methods it's prefixed with the receiver type (e.g. "Type.Method").
// value contains the list of params and return types.
Funcs map[string]Func `json:"funcs,omitempty"`
// the list of exported interfaces.
// key is the exported name, value contains the interface definition.
Interfaces map[string]Interface `json:"interfaces,omitempty"`
// the list of exported struct types.
// key is the exported name, value contains field information.
Structs map[string]Struct `json:"structs,omitempty"`
}
// Count returns the count of items
func (c Content) Count() int {
return len(c.Consts) + len(c.Funcs) + len(c.Interfaces) + len(c.Structs)
}
// Const is a const definition.
type Const struct {
// the type of the constant
Type string `json:"type"`
// the value of the constant
Value string `json:"value"`
}
// Func contains parameter and return types of a function/method.
type Func struct {
// a comma-delimited list of the param types
Params *string `json:"params,omitempty"`
// a comma-delimited list of the return types
Returns *string `json:"returns,omitempty"`
}
// Interface contains the list of methods for an interface.
type Interface struct {
// a list of embedded interfaces
AnonymousFields []string `json:"anon,omitempty"`
// key/value pairs of the methd names and their definitions
Methods map[string]Func
}
// Struct contains field info about a struct.
type Struct struct {
// a list of anonymous fields
AnonymousFields []string `json:"anon,omitempty"`
// key/value pairs of the field names and types respectively.
Fields map[string]string `json:"fields,omitempty"`
}
// NewContent returns an initialized Content object.
func NewContent() Content {
return Content{
Consts: make(map[string]Const),
Funcs: make(map[string]Func),
Interfaces: make(map[string]Interface),
Structs: make(map[string]Struct),
}
}
// IsEmpty returns true if there is no content in any of the fields.
func (c Content) IsEmpty() bool {
return len(c.Consts) == 0 && len(c.Funcs) == 0 && len(c.Interfaces) == 0 && len(c.Structs) == 0
}
// adds the specified const declaration to the exports list
func (c *Content) addConst(pkg Package, g *ast.GenDecl) {
for _, s := range g.Specs {
co := Const{}
vs := s.(*ast.ValueSpec)
v := ""
// Type is nil for untyped consts
if vs.Type != nil {
switch x := vs.Type.(type) {
case *ast.Ident:
co.Type = x.Name
v = vs.Values[0].(*ast.BasicLit).Value
case *ast.SelectorExpr:
co.Type = x.Sel.Name
v = vs.Values[0].(*ast.BasicLit).Value
default:
panic(fmt.Sprintf("wrong type %T", vs.Type))
}
} else {
// get the type from the token type
if bl, ok := vs.Values[0].(*ast.BasicLit); ok {
co.Type = strings.ToLower(bl.Kind.String())
v = bl.Value
} else if ce, ok := vs.Values[0].(*ast.CallExpr); ok {
// const FooConst = FooType("value")
co.Type = pkg.getText(ce.Fun.Pos(), ce.Fun.End())
v = pkg.getText(ce.Args[0].Pos(), ce.Args[0].End())
} else if ce, ok := vs.Values[0].(*ast.BinaryExpr); ok {
// const FooConst = "value" + Bar
co.Type = "*ast.BinaryExpr"
v = pkg.getText(ce.X.Pos(), ce.Y.End())
} else {
panic(fmt.Sprintf("unhandled case for adding constant: %s", pkg.getText(vs.Pos(), vs.End())))
}
}
// TODO should this also be removed?
// remove any surrounding quotes
if v[0] == '"' {
v = v[1 : len(v)-1]
}
co.Value = v
c.Consts[vs.Names[0].Name] = co
}
}
// adds the specified function declaration to the exports list
func (c *Content) addFunc(pkg Package, f *ast.FuncDecl) {
// create a method sig, for methods it's a combination of the receiver type
// with the function name e.g. "FooReceiver.Method", else just the function name.
sig := ""
if f.Recv != nil {
sig = pkg.getText(f.Recv.List[0].Type.Pos(), f.Recv.List[0].Type.End())
sig += "."
}
sig += f.Name.Name
c.Funcs[sig] = pkg.buildFunc(f.Type)
}
// adds the specified interface type to the exports list.
func (c *Content) addInterface(pkg Package, name string, i *ast.InterfaceType) {
in := Interface{Methods: map[string]Func{}}
if i.Methods != nil {
pkg.translateFieldList(i.Methods.List, func(n *string, t string, f *ast.Field) {
if n == nil {
in.AnonymousFields = append(in.AnonymousFields, t)
} else {
if in.Methods == nil {
in.Methods = map[string]Func{}
}
in.Methods[*n] = pkg.buildFunc(f.Type.(*ast.FuncType))
}
})
}
c.Interfaces[name] = in
}
// adds the specified struct type to the exports list.
func (c *Content) addStruct(pkg Package, name string, s *ast.StructType) {
sd := Struct{}
// assumes all struct types have fields
pkg.translateFieldList(s.Fields.List, func(n *string, t string, f *ast.Field) {
if n == nil {
sd.AnonymousFields = append(sd.AnonymousFields, t)
} else {
if sd.Fields == nil {
sd.Fields = map[string]string{}
}
sd.Fields[*n] = t
}
})
c.Structs[name] = sd
}
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