153 lines
3.4 KiB
Go
153 lines
3.4 KiB
Go
//go:build generate
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// +build generate
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// gen_blocks.go generates block information.
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package main
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"os"
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"text/template"
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"github.com/iancoleman/strcase"
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)
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const (
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version = "1.17"
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infoURL = "https://raw.githubusercontent.com/PrismarineJS/minecraft-data/master/data/pc/" + version + "/blocks.json"
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//language=gohtml
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blockTmpl = `// Code generated by gen_block.go; DO NOT EDIT.
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// Package block stores information about blocks in Minecraft.
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package block
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import (
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"math/bits"
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)
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// BitsPerBlock indicates how many bits are needed to represent all possible
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// block states. This value is used to determine the size of the global palette.
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var BitsPerBlock = bits.Len(uint(len(StateID)))
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// ID describes the numeric ID of a block.
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type ID uint32
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// Block describes information about a type of block.
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type Block struct {
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ID ID
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DisplayName string
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Name string
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Hardness float64
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Diggable bool
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DropIDs []uint32
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NeedsTools map[uint32]bool
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MinStateID uint32
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MaxStateID uint32
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Transparent bool
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FilterLightLevel int
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EmitLightLevel int
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}
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var (
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{{- range .}}
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{{.CamelName}} = Block{
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ID: {{.ID}},
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DisplayName: "{{.DisplayName}}",
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Name: "{{.Name}}",
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Hardness: {{.Hardness}},
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Diggable: {{.Diggable}},
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DropIDs: []uint32{ {{- range .DropIDs}}{{.}},{{end -}} },
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NeedsTools: map[uint32]bool{ {{- range $key, $val := .NeedsTools}}{{$key}}: {{$val}},{{end -}} },
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MinStateID: {{.MinStateID}},
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MaxStateID: {{.MaxStateID}},
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Transparent: {{.Transparent}},
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FilterLightLevel: {{.FilterLightLevel}},
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EmitLightLevel: {{.EmitLightLevel}},
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}{{end}}
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)
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// ByID is an index of minecraft blocks by their ID.
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var ByID = map[ID]*Block{ {{range .}}
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{{.ID}}: &{{.CamelName}},{{end}}
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}
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// StateID maps all possible state IDs to a corresponding block ID.
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var StateID = map[uint32]ID{ {{range $block := .}}
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{{- range .States}}
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{{.}}: {{$block.ID}},
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{{- end}}{{end}}
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}`
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)
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type Block struct {
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ID uint32 `json:"id"`
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CamelName string `json:"-"`
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DisplayName string `json:"displayName"`
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Name string `json:"name"`
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Hardness float64 `json:"hardness"`
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Diggable bool `json:"diggable"`
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DropIDs []uint32 `json:"drops"`
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NeedsTools map[uint32]bool `json:"harvestTools"`
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MinStateID uint32 `json:"minStateId"`
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MaxStateID uint32 `json:"maxStateId"`
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Transparent bool `json:"transparent"`
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FilterLightLevel int `json:"filterLight"`
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EmitLightLevel int `json:"emitLight"`
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}
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func (b Block) States() []uint32 {
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if b.MinStateID == b.MaxStateID {
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return []uint32{b.MinStateID}
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}
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states := make([]uint32, 0)
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for i := b.MinStateID; i <= b.MaxStateID; i++ {
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states = append(states, i)
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}
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return states
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}
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func downloadInfo() ([]*Block, error) {
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resp, err := http.Get(infoURL)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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var data []*Block
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if err := json.NewDecoder(resp.Body).Decode(&data); err != nil {
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return nil, err
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}
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for _, d := range data {
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d.CamelName = strcase.ToCamel(d.Name)
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}
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return data, nil
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}
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//go:generate go run $GOFILE
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//go:generate go fmt block.go
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func main() {
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fmt.Println("generating block.go")
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blocks, err := downloadInfo()
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if err != nil {
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panic(err)
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}
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f, err := os.Create("block.go")
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if err != nil {
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panic(err)
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}
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defer f.Close()
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if err := template.Must(template.New("").Parse(blockTmpl)).Execute(f, blocks); err != nil {
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panic(err)
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}
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}
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