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gen_types.go
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/
gen_types.go
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package main
import (
"fmt"
"os"
"text/template"
)
type (
TypeInfo struct {
Name string
TypeName string
}
)
var header string = `// Generated by gen_types. Don't modify manually!
package core
`
var importFmt string = `
import (
"fmt"
)
`
var assertTemplate string = `
func Assert{{.Name}}(obj Object, msg string) {{.TypeName}} {
switch c := obj.(type) {
case {{.TypeName}}:
return c
default:
if msg == "" {
msg = fmt.Sprintf("Expected %s, got %s", "{{.Name}}", obj.GetType().ToString(false))
}
panic(RT.NewError(msg))
}
}
`
var ensureTemplate string = `
func Ensure{{.Name}}(args []Object, index int) {{.TypeName}} {
switch c := args[index].(type) {
case {{.TypeName}}:
return c
default:
panic(RT.NewArgTypeError(index, c, "{{.Name}}"))
}
}
`
var infoTemplate string = `
func (x {{.TypeName}}) WithInfo(info *ObjectInfo) Object {
x.info = info
return x
}
`
func checkError(err error) {
if err != nil {
panic(err)
}
}
func generateAssertions(types []string) {
filename := "types_assert_gen.go"
f, err := os.Create(filename)
checkError(err)
defer f.Close()
var assert = template.Must(template.New("assert").Parse(assertTemplate))
var ensure = template.Must(template.New("ensure").Parse(ensureTemplate))
f.WriteString(header)
f.WriteString(importFmt)
for _, t := range types {
typeInfo := TypeInfo{
Name: t,
TypeName: t,
}
if t[0] == '*' {
typeInfo.Name = t[1:]
}
assert.Execute(f, typeInfo)
ensure.Execute(f, typeInfo)
}
}
func generateInfo(types []string) {
filename := "types_info_gen.go"
f, err := os.Create(filename)
checkError(err)
defer f.Close()
var info = template.Must(template.New("info").Parse(infoTemplate))
f.WriteString(header)
for _, t := range types {
typeInfo := TypeInfo{
Name: t,
TypeName: t,
}
if t[0] == '*' {
typeInfo.Name = t[1:]
}
info.Execute(f, typeInfo)
}
}
func main() {
cmd := os.Args[1]
switch cmd {
case "assert":
generateAssertions(os.Args[2:])
case "info":
generateInfo(os.Args[2:])
default:
fmt.Println("Unknown command: ", cmd)
}
}