mirror of
https://github.com/superseriousbusiness/gotosocial
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[chore] Update a bunch of database dependencies (#1772)
* [chore] Update a bunch of database dependencies * fix lil thing
This commit is contained in:
tobi
GitHub
266
vendor/github.com/jackc/pgx/v5/named_args.go
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vendored
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266
vendor/github.com/jackc/pgx/v5/named_args.go
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@ -0,0 +1,266 @@
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package pgx
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import (
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"context"
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"strconv"
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"strings"
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"unicode/utf8"
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)
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// NamedArgs can be used as the first argument to a query method. It will replace every '@' named placeholder with a '$'
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// ordinal placeholder and construct the appropriate arguments.
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//
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// For example, the following two queries are equivalent:
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//
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// conn.Query(ctx, "select * from widgets where foo = @foo and bar = @bar", pgx.NamedArgs{"foo": 1, "bar": 2})
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// conn.Query(ctx, "select * from widgets where foo = $1 and bar = $2", 1, 2)
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type NamedArgs map[string]any
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// RewriteQuery implements the QueryRewriter interface.
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func (na NamedArgs) RewriteQuery(ctx context.Context, conn *Conn, sql string, args []any) (newSQL string, newArgs []any, err error) {
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l := &sqlLexer{
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src: sql,
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stateFn: rawState,
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nameToOrdinal: make(map[namedArg]int, len(na)),
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}
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for l.stateFn != nil {
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l.stateFn = l.stateFn(l)
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}
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sb := strings.Builder{}
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for _, p := range l.parts {
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switch p := p.(type) {
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case string:
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sb.WriteString(p)
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case namedArg:
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sb.WriteRune('$')
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sb.WriteString(strconv.Itoa(l.nameToOrdinal[p]))
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}
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}
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newArgs = make([]any, len(l.nameToOrdinal))
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for name, ordinal := range l.nameToOrdinal {
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newArgs[ordinal-1] = na[string(name)]
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}
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return sb.String(), newArgs, nil
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}
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type namedArg string
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type sqlLexer struct {
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src string
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start int
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pos int
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nested int // multiline comment nesting level.
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stateFn stateFn
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parts []any
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nameToOrdinal map[namedArg]int
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}
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type stateFn func(*sqlLexer) stateFn
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func rawState(l *sqlLexer) stateFn {
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for {
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r, width := utf8.DecodeRuneInString(l.src[l.pos:])
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l.pos += width
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switch r {
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case 'e', 'E':
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nextRune, width := utf8.DecodeRuneInString(l.src[l.pos:])
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if nextRune == '\'' {
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l.pos += width
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return escapeStringState
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}
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case '\'':
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return singleQuoteState
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case '"':
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return doubleQuoteState
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case '@':
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nextRune, _ := utf8.DecodeRuneInString(l.src[l.pos:])
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if isLetter(nextRune) {
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if l.pos-l.start > 0 {
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l.parts = append(l.parts, l.src[l.start:l.pos-width])
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}
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l.start = l.pos
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return namedArgState
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}
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case '-':
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nextRune, width := utf8.DecodeRuneInString(l.src[l.pos:])
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if nextRune == '-' {
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l.pos += width
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return oneLineCommentState
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}
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case '/':
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nextRune, width := utf8.DecodeRuneInString(l.src[l.pos:])
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if nextRune == '*' {
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l.pos += width
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return multilineCommentState
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}
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case utf8.RuneError:
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if l.pos-l.start > 0 {
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l.parts = append(l.parts, l.src[l.start:l.pos])
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l.start = l.pos
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}
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return nil
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}
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}
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}
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func isLetter(r rune) bool {
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return (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z')
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}
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func namedArgState(l *sqlLexer) stateFn {
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for {
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r, width := utf8.DecodeRuneInString(l.src[l.pos:])
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l.pos += width
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if r == utf8.RuneError {
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if l.pos-l.start > 0 {
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na := namedArg(l.src[l.start:l.pos])
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if _, found := l.nameToOrdinal[na]; !found {
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l.nameToOrdinal[na] = len(l.nameToOrdinal) + 1
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}
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l.parts = append(l.parts, na)
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l.start = l.pos
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}
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return nil
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} else if !(isLetter(r) || (r >= '0' && r <= '9') || r == '_') {
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l.pos -= width
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na := namedArg(l.src[l.start:l.pos])
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if _, found := l.nameToOrdinal[na]; !found {
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l.nameToOrdinal[na] = len(l.nameToOrdinal) + 1
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}
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l.parts = append(l.parts, namedArg(na))
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l.start = l.pos
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return rawState
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}
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}
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}
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func singleQuoteState(l *sqlLexer) stateFn {
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for {
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r, width := utf8.DecodeRuneInString(l.src[l.pos:])
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l.pos += width
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switch r {
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case '\'':
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nextRune, width := utf8.DecodeRuneInString(l.src[l.pos:])
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if nextRune != '\'' {
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return rawState
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}
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l.pos += width
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case utf8.RuneError:
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if l.pos-l.start > 0 {
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l.parts = append(l.parts, l.src[l.start:l.pos])
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l.start = l.pos
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}
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return nil
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}
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}
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}
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func doubleQuoteState(l *sqlLexer) stateFn {
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for {
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r, width := utf8.DecodeRuneInString(l.src[l.pos:])
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l.pos += width
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switch r {
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case '"':
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nextRune, width := utf8.DecodeRuneInString(l.src[l.pos:])
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if nextRune != '"' {
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return rawState
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}
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l.pos += width
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case utf8.RuneError:
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if l.pos-l.start > 0 {
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l.parts = append(l.parts, l.src[l.start:l.pos])
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l.start = l.pos
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}
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return nil
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}
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}
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}
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func escapeStringState(l *sqlLexer) stateFn {
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for {
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r, width := utf8.DecodeRuneInString(l.src[l.pos:])
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l.pos += width
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switch r {
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case '\\':
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_, width = utf8.DecodeRuneInString(l.src[l.pos:])
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l.pos += width
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case '\'':
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nextRune, width := utf8.DecodeRuneInString(l.src[l.pos:])
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if nextRune != '\'' {
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return rawState
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}
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l.pos += width
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case utf8.RuneError:
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if l.pos-l.start > 0 {
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l.parts = append(l.parts, l.src[l.start:l.pos])
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l.start = l.pos
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}
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return nil
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}
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}
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}
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func oneLineCommentState(l *sqlLexer) stateFn {
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for {
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r, width := utf8.DecodeRuneInString(l.src[l.pos:])
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l.pos += width
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switch r {
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case '\\':
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_, width = utf8.DecodeRuneInString(l.src[l.pos:])
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l.pos += width
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case '\n', '\r':
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return rawState
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case utf8.RuneError:
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if l.pos-l.start > 0 {
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l.parts = append(l.parts, l.src[l.start:l.pos])
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l.start = l.pos
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}
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return nil
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}
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}
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}
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func multilineCommentState(l *sqlLexer) stateFn {
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for {
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r, width := utf8.DecodeRuneInString(l.src[l.pos:])
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l.pos += width
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switch r {
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case '/':
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nextRune, width := utf8.DecodeRuneInString(l.src[l.pos:])
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if nextRune == '*' {
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l.pos += width
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l.nested++
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}
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case '*':
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nextRune, width := utf8.DecodeRuneInString(l.src[l.pos:])
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if nextRune != '/' {
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continue
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}
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l.pos += width
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if l.nested == 0 {
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return rawState
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}
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l.nested--
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case utf8.RuneError:
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if l.pos-l.start > 0 {
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l.parts = append(l.parts, l.src[l.start:l.pos])
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l.start = l.pos
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}
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return nil
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}
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}
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}
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