/
loc.go
156 lines (122 loc) · 3 KB
/
loc.go
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package function
import (
"bytes"
"errors"
"fmt"
"github.com/hhatto/gocloc"
"gopkg.in/src-d/enry.v1"
"gopkg.in/src-d/go-mysql-server.v0/sql"
)
var languages = gocloc.NewDefinedLanguages()
var errEmptyInputValues = errors.New("empty input values")
type LOC struct {
Left sql.Expression
Right sql.Expression
}
// NewLOC creates a new LOC UDF.
func NewLOC(args ...sql.Expression) (sql.Expression, error) {
if len(args) != 2 {
return nil, sql.ErrInvalidArgumentNumber.New("2", len(args))
}
return &LOC{args[0], args[1]}, nil
}
// Resolved implements the Expression interface.
func (f *LOC) Resolved() bool {
return f.Left.Resolved() && f.Right.Resolved()
}
func (f *LOC) String() string {
return fmt.Sprintf("loc(%s, %s)", f.Left, f.Right)
}
// IsNullable implements the Expression interface.
func (f *LOC) IsNullable() bool {
return f.Left.IsNullable() || f.Right.IsNullable()
}
// Type implements the Expression interface.
func (LOC) Type() sql.Type {
return sql.JSON
}
// TransformUp implements the Expression interface.
func (f *LOC) TransformUp(fn sql.TransformExprFunc) (sql.Expression, error) {
left, err := f.Left.TransformUp(fn)
if err != nil {
return nil, err
}
right, err := f.Right.TransformUp(fn)
if err != nil {
return nil, err
}
return fn(&LOC{left, right})
}
// Eval implements the Expression interface.
func (f *LOC) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
span, ctx := ctx.Span("gitbase.LOC")
defer span.Finish()
path, blob, err := f.getInputValues(ctx, row)
if err != nil {
if err == errEmptyInputValues {
return nil, nil
}
return nil, err
}
lang := f.getLanguage(path, blob)
if lang == "" || languages.Langs[lang] == nil {
return nil, nil
}
return gocloc.AnalyzeReader(
path,
languages.Langs[lang],
bytes.NewReader(blob), &gocloc.ClocOptions{},
), nil
}
func (f *LOC) getInputValues(ctx *sql.Context, row sql.Row) (string, []byte, error) {
left, err := f.Left.Eval(ctx, row)
if err != nil {
return "", nil, err
}
left, err = sql.Text.Convert(left)
if err != nil {
return "", nil, err
}
right, err := f.Right.Eval(ctx, row)
if err != nil {
return "", nil, err
}
right, err = sql.Blob.Convert(right)
if err != nil {
return "", nil, err
}
if right == nil {
return "", nil, errEmptyInputValues
}
path, ok := left.(string)
if !ok {
return "", nil, errEmptyInputValues
}
blob, ok := right.([]byte)
if !ok {
return "", nil, errEmptyInputValues
}
if len(blob) == 0 || len(path) == 0 {
return "", nil, errEmptyInputValues
}
return path, blob, nil
}
func (f *LOC) getLanguage(path string, blob []byte) string {
hash := languageHash(path, blob)
value, ok := languageCache.Get(hash)
if ok {
return value.(string)
}
lang := enry.GetLanguage(path, blob)
if len(blob) > 0 {
languageCache.Add(hash, lang)
}
return lang
}
// Children implements the Expression interface.
func (f *LOC) Children() []sql.Expression {
if f.Right == nil {
return []sql.Expression{f.Left}
}
return []sql.Expression{f.Left, f.Right}
}