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generator.go
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generator.go
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package evalid
import (
"fmt"
"go/ast"
"go/token"
"log"
"strings"
"github.com/lawrsp/pigo/generator/builder"
"github.com/lawrsp/pigo/generator"
"github.com/lawrsp/pigo/generator/parser"
)
type Config struct {
Const string
Name string
Output string
Input string
Type string
}
type nameWithPos struct {
name string
position token.Position
}
type Generator struct {
generator.Generator
Name string
NamePrefix string
NamesWithPos map[string][]nameWithPos
Type string
}
func NewGenerator() *Generator {
return &Generator{
NamesWithPos: map[string][]nameWithPos{},
}
}
func (g *Generator) collectNames(decl *ast.GenDecl) bool {
for _, spec := range decl.Specs {
switch x := spec.(type) {
case *ast.ValueSpec:
name := x.Names[0].Name
if strings.HasPrefix(name, g.NamePrefix) {
namePos := x.Names[0].NamePos
position := g.Parser.FileSet.Position(namePos)
names := g.NamesWithPos[position.Filename]
if names == nil {
names = []nameWithPos{}
g.NamesWithPos[position.Filename] = names
}
names = append(names, nameWithPos{
name: name,
position: position,
})
g.NamesWithPos[position.Filename] = names
}
}
}
return true
}
func (g *Generator) PrepareTask(conf *Config) {
if conf.Const == "" {
log.Fatalf("no const name specified")
}
g.NamePrefix = conf.Const
g.Name = conf.Name
g.Type = conf.Type
if conf.Input != "" {
file := g.Pkg.GetFile(conf.Input)
parser.WalkFile(file, parser.NewGenDeclWalker(token.CONST, g.collectNames))
} else {
parser.WalkPackage(g.Pkg, parser.NewGenDeclWalker(token.CONST, g.collectNames))
}
}
func groupNamesByPos(names []nameWithPos) [][]string {
groups := [][]string{}
index := -1
lastLine := -1
for _, np := range names {
if index < 0 {
g := []string{np.name}
groups = append(groups, g)
index = 0
lastLine = np.position.Line
continue
}
thisLine := np.position.Line
if thisLine > lastLine+1 {
g := []string{np.name}
groups = append(groups, g)
index += 1
} else {
groups[index] = append(groups[index], np.name)
}
lastLine = thisLine
}
return groups
}
func groupNames(names map[string][]nameWithPos) [][]string {
groups := [][]string{}
for _, cns := range names {
groups = append(groups, groupNamesByPos(cns)...)
}
return groups
}
func (g *Generator) Run() {
// argType := parser.NewType(g.Type)
// resultType := parser.BasicType("bool")
// fntType := parser.TypeWithName(&parser.FuncType{
// Params: []*parser.Field{
// parser.NewField(argType, "t", ""),
// },
// Results: []*parser.Field{
// parser.NewField(resultType, "", ""),
// },
// }, name)
// fb := builder.NewFunction(file, nil, fntType, nil)
// v := builder.GetVariable(fb, argType, builder.READ_MODE, builder.Scope_Function)
// if v == nil {
// log.Fatalf("cannot find argument variable")
// }
file := builder.NewFile(nil, g.File)
name := g.Name
if name == "" {
name = fmt.Sprintf("Is%sValid", g.NamePrefix)
}
bd := builder.NewFuncBuffer(file, name)
bd.Printf("func %s(t %s) bool {\n", name, g.Type)
bd.Printf("\tswitch t {\n")
groupNames := groupNames(g.NamesWithPos)
for _, group := range groupNames {
bd.Printf("\t\tcase %s:\n", strings.Join(group, ","))
bd.Printf("\t\t\treturn true\n")
}
bd.Printf("\t\tdefault:\n")
bd.Printf("\t\t\treturn false\n")
bd.Printf("\t}\n")
bd.Printf("}\n")
file.Add(bd)
}
func (g *Generator) Generate(conf *Config) error {
g.Prepare(".", nil, conf.Output)
g.PrepareTask(conf)
g.Run()
g.Output(conf.Output)
return nil
}