feat: add zero parser (#23)

pkg/parsers/zero/zero.go

@@ -0,0 +1,68 @@
+package zero
+
+import (
+	"encoding/json"
+	"os"
+)
+
+type ZeroProgram struct {
+	Builtins  map[string]int64 `json:"builtins"`
+	Code      string           `json:"code"`
+	DebugInfo DebugInfo        `json:"debug_info"`
+	Prime     string           `json:"prime"`
+	Version   string           `json:"version"`
+}
+
+type DebugInfo struct {
+	InstructionOffsets []int64 `json:"instruction_offsets"`
+	SourceCode         string  `json:"source_code"`
+	SourcePath         string  `json:"source_path"`
+}
+
+func (z ZeroProgram) MarshalToFile(filepath string) error {
+	// Marshal Output struct into JSON bytes
+	data, err := json.MarshalIndent(z, "", "    ")
+	if err != nil {
+		return err
+	}
+
+	// Write JSON bytes to file
+	err = os.WriteFile(filepath, data, 0o644)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func ZeroProgramFromFile(filepath string) (zero *ZeroProgram, err error) {
+	content, err := os.ReadFile(filepath)
+	if err != nil {
+		return
+	}
+	return ZeroProgramFromJSON(content)
+}
+
+func ZeroProgramFromJSON(content json.RawMessage) (*ZeroProgram, error) {
+	var zero ZeroProgram
+	return &zero, json.Unmarshal(content, &zero)
+}
+
+func (z *ZeroProgram) MarshalJSON() ([]byte, error) {
+	return json.Marshal(z)
+}
+
+func (z *ZeroProgram) UnmarshalJSON(data []byte) error {
+	type zero ZeroProgram // create new type identical to ZeroProgram
+	var zTemp zero        // create variable of new type
+
+	// Unmarshal data into zTemp
+	if err := json.Unmarshal(data, &zTemp); err != nil {
+		return err
+	}
+
+	// Copy data from zTemp to z
+	*z = ZeroProgram(zTemp)
+
+	return nil
+}