code_unit.go

package main

import (
	"fmt"
)

type CodeUnit struct {
	Path            string
	Name            string
	Definition      string
	previousExists  bool
	parseSignature  bool
}

/*
 * Generic drop function for code units
 */
func ( unit CodeUnit ) Drop( dropQuery string ) ( err error ) {
	rows, err := Query( dropQuery )
	if err != nil { return err }
	rows.Close()

	return
}

/*
 * Generic creation function for code units
 */
func ( unit CodeUnit ) Create( definition string ) ( err error ) {
	rows, err := Query( definition )
	if err != nil { return err }
	rows.Close()

	return
}

type CodeUnitCreator interface {
	Load() error
	Parse() error
	Drop() error
	Create() error
}

/*
 * Steps used in down pass, when dropping existing code, in dependency
 * graph reverse order
 */
func DownPass( unit CodeUnitCreator, path string ) ( err error ) {
	errFmt := "  error while loading %s\n  %v\n"

	if err = unit.Load() ; err != nil { return fmt.Errorf( errFmt, path, err ) }
	if err = unit.Parse() ; err != nil { return fmt.Errorf( errFmt, path, err ) }
	if err = unit.Drop() ; err != nil { return fmt.Errorf( errFmt, path, err ) }

	return
}

/*
 * Steps used in up pass, when creating existing code, in dependency
 * graph order
 */
func UpPass( unit CodeUnitCreator, path string ) ( err error ) {
	errFmt := "  error while creating %s\n  %v\n"
	if err = unit.Create() ; err != nil { return fmt.Errorf( errFmt, path, err ) }

	return
}