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package chunker
import (
"crypto/sha256"
"fmt"
"os"
"strings"
sitter "github.com/smacker/go-tree-sitter"
"github.com/smacker/go-tree-sitter/golang"
)
// Chunk represents a semantically meaningful piece of code
type Chunk struct {
File string
StartLine int
EndLine int
Type string // "function", "method", "type"
Name string
Content string
Hash string
}
// Chunker extracts semantic chunks from source code
type Chunker interface {
Chunk(path string, content []byte) ([]Chunk, error)
}
// GoChunker extracts chunks from Go source files using tree-sitter
type GoChunker struct {
parser *sitter.Parser
}
// NewGoChunker creates a new Go chunker
func NewGoChunker() *GoChunker {
parser := sitter.NewParser()
parser.SetLanguage(golang.GetLanguage())
return &GoChunker{parser: parser}
}
// ChunkFile reads and chunks a file
func (c *GoChunker) ChunkFile(path string) ([]Chunk, error) {
content, err := os.ReadFile(path)
if err != nil {
return nil, err
}
return c.Chunk(path, content)
}
// Chunk extracts semantic chunks from Go source
func (c *GoChunker) Chunk(path string, content []byte) ([]Chunk, error) {
tree := c.parser.Parse(nil, content)
if tree == nil {
return nil, fmt.Errorf("failed to parse %s", path)
}
defer tree.Close()
var chunks []Chunk
root := tree.RootNode()
// Walk top-level declarations
for i := 0; i < int(root.ChildCount()); i++ {
node := root.Child(i)
chunk := c.extractChunk(node, content, path)
if chunk != nil {
chunks = append(chunks, *chunk)
}
}
return chunks, nil
}
func (c *GoChunker) extractChunk(node *sitter.Node, content []byte, path string) *Chunk {
nodeType := node.Type()
switch nodeType {
case "function_declaration":
return c.extractFunction(node, content, path)
case "method_declaration":
return c.extractMethod(node, content, path)
case "type_declaration":
return c.extractType(node, content, path)
}
return nil
}
func (c *GoChunker) extractFunction(node *sitter.Node, content []byte, path string) *Chunk {
nameNode := node.ChildByFieldName("name")
if nameNode == nil {
return nil
}
name := string(content[nameNode.StartByte():nameNode.EndByte()])
text := string(content[node.StartByte():node.EndByte()])
return &Chunk{
File: path,
StartLine: int(node.StartPoint().Row) + 1,
EndLine: int(node.EndPoint().Row) + 1,
Type: "function",
Name: name,
Content: text,
Hash: hash(text),
}
}
func (c *GoChunker) extractMethod(node *sitter.Node, content []byte, path string) *Chunk {
nameNode := node.ChildByFieldName("name")
receiverNode := node.ChildByFieldName("receiver")
if nameNode == nil {
return nil
}
name := string(content[nameNode.StartByte():nameNode.EndByte()])
// Build receiver prefix like (*Server) or (s Server)
if receiverNode != nil {
recvText := string(content[receiverNode.StartByte():receiverNode.EndByte()])
// Extract type from receiver, e.g., "(s *Server)" -> "*Server"
recvType := extractReceiverType(recvText)
if recvType != "" {
name = fmt.Sprintf("(%s).%s", recvType, name)
}
}
text := string(content[node.StartByte():node.EndByte()])
return &Chunk{
File: path,
StartLine: int(node.StartPoint().Row) + 1,
EndLine: int(node.EndPoint().Row) + 1,
Type: "method",
Name: name,
Content: text,
Hash: hash(text),
}
}
func (c *GoChunker) extractType(node *sitter.Node, content []byte, path string) *Chunk {
// type_declaration contains type_spec children
for i := 0; i < int(node.ChildCount()); i++ {
child := node.Child(i)
if child.Type() == "type_spec" {
nameNode := child.ChildByFieldName("name")
if nameNode == nil {
continue
}
name := string(content[nameNode.StartByte():nameNode.EndByte()])
text := string(content[node.StartByte():node.EndByte()])
return &Chunk{
File: path,
StartLine: int(node.StartPoint().Row) + 1,
EndLine: int(node.EndPoint().Row) + 1,
Type: "type",
Name: name,
Content: text,
Hash: hash(text),
}
}
}
return nil
}
// extractReceiverType extracts the type from a receiver like "(s *Server)" -> "*Server"
func extractReceiverType(recv string) string {
// Remove parens
recv = strings.TrimPrefix(recv, "(")
recv = strings.TrimSuffix(recv, ")")
recv = strings.TrimSpace(recv)
// Split on space, take last part (the type)
parts := strings.Fields(recv)
if len(parts) == 0 {
return ""
}
return parts[len(parts)-1]
}
func hash(s string) string {
h := sha256.Sum256([]byte(s))
return fmt.Sprintf("%x", h[:8]) // First 8 bytes = 16 hex chars
}
|
