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classcmd.go
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classcmd.go
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package pbrtparser
import (
"errors"
"fmt"
"strconv"
"strings"
)
var (
// ErrClassCommandForm stands for format of command wrong
ErrClassCommandForm = errors.New("Token form wrong")
// ErrClassEmpty stands for that a name of class is empty
ErrClassEmpty = errors.New("Empty class")
)
// Param stores param in class command
type Param struct {
Name string `json:"name"`
Type string `json:"type"`
Val interface{} `json:"val"`
}
func newParam(name, typ, rawVal string) (*Param, error) {
switch typ {
case "string", "texture":
return &Param{
Name: name,
Type: typ,
Val: rawVal,
}, nil
case "bool":
var val bool
if rawVal == "true" {
val = true
} else if rawVal == "false" {
val = false
} else {
return nil, fmt.Errorf("pbrtparser.classcmd.newParam: bool value=%s", rawVal)
}
return &Param{
Name: name,
Type: typ,
Val: val,
}, nil
case "integer":
vals := []int{}
for _, s := range strings.Fields(rawVal) {
i, err := strconv.Atoi(s)
if err != nil {
return nil, fmt.Errorf("pbrtparser.classmd.newParam: %s", err)
}
vals = append(vals, i)
}
return &Param{
Name: name,
Type: typ,
Val: vals,
}, nil
case "float", "color", "rgb", "xyz", "spectrum",
"point", "point2", "point3",
"vector", "vector2", "vector3",
"blackbody", "normal":
vals := []float64{}
for _, s := range strings.Fields(rawVal) {
f, err := strconv.ParseFloat(s, 64)
if err != nil {
return nil, fmt.Errorf("pbrtparser.classmd: %s", err)
}
vals = append(vals, f)
}
return &Param{
Name: name,
Type: typ,
Val: vals,
}, nil
default:
return nil, errors.New(typ + " param not match")
}
}
func parseParamList(tokens []string) ([]*Param, error) {
ll := len(tokens)
var err error
params := []*Param{}
for lx := 0; lx < ll; lx += 6 {
// ", ParamName Type, ", [, Raw Value, ]
err = assureForm(tokens[lx:lx+3], `"`, `"`)
if err != nil {
return nil, err
}
def := strings.Fields(tokens[lx+1])
if len(def) != 2 {
return nil, fmt.Errorf("pbrtparser.parseParamList: Error def of param")
}
if def[0] == "string" || def[0] == "bool" || def[0] == "texture" {
err = assureForm(tokens[lx+3:lx+6], `"`, `"`)
} else {
err = assureForm(tokens[lx+3:lx+6], `[`, `]`)
}
if err != nil {
return nil, err
}
param, err := newParam(def[1], def[0], tokens[lx+4])
if err != nil {
return nil, err
}
params = append(params, param)
}
return params, nil
}
// ClassCmd stores parameters of class command
// COMMANDTYPE "Name" "Par1.Type1 Par1.Name1" [Par1.Vals] ...
type ClassCmd struct {
Cmd
Name string `json:"name"`
Params []*Param `json:"params"`
}
func isClassCmd(rawCommand string) bool {
for _, prefix := range []string{
"Camera",
"Material",
"Shape",
"Film",
"Sampler",
"Integrator",
"LightSource",
"AreaLightSource",
"MakeNamedMedium",
"MakeNamedMaterial",
} {
if strings.HasPrefix(rawCommand, prefix) {
return true
}
}
return false
}
func parseClassCmd(rawCommand string) (*ClassCmd, error) {
tokens := toTokens(rawCommand)
cmd := ClassCmd{}
if len(tokens) == 0 {
return nil, ErrClassEmpty
}
class := tokens[0]
tokens = tokens[1:]
ll := len(tokens)
if ll == 0 {
return nil, fmt.Errorf("pbrtparse.parseClass: Empty Command")
}
// Schema: "NAME" "ParamName Type" [Values] ...
// Len = 3 + 6x
if (ll-3)%6 != 0 {
return nil, ErrClassCommandForm
}
var err error
err = assureForm(tokens[:3], `"`, `"`)
if err != nil {
return nil, err
}
cmd.Name = tokens[1]
cmd.Params, err = parseParamList(tokens[3:])
if err != nil {
return nil, err
}
cmd.CmdType = class
return &cmd, nil
}
// TextureCmd stores parameters of texture command:
type TextureCmd struct {
Cmd
Name string `json:"name"`
Type string `json:"type"`
Class string `json:"class"`
Params []*Param `json:"params"`
}
func parseTextureCmd(rawCommand string) (interface{}, error) {
tokens := toTokens(rawCommand)
if len(tokens) == 0 {
return nil, ErrClassEmpty
}
tokens = tokens[1:]
ll := len(tokens)
if ll == 0 {
return nil, fmt.Errorf("pbrtparse.parseClass: Empty Command")
}
// Schema: "NAME" "Type" "Class" "ParamName Type" [Values] ...
// Len = 9 + 6x
if ll < 9 || (ll-9)%6 != 0 {
return nil, ErrClassCommandForm
}
var err error
for i := 0; i < 9; i += 3 {
err = assureForm(tokens[i:i+3], `"`, `"`)
if err != nil {
return nil, err
}
}
cmd := TextureCmd{
Name: tokens[1],
Type: tokens[4],
Class: tokens[7],
}
cmd.CmdType = "Texture"
cmd.Params, err = parseParamList(tokens[9:])
if err != nil {
return nil, err
}
return &cmd, nil
}