Function caretAtStatementStart

backend/plugin/parser/tidb/completion.go:408–416

caretAtStatementStart reports whether the caret is at a statement-start position — only whitespace and comments precede it (or it directly follows a ';'), ignoring any partial identifier the user is currently typing (so "CRE" or "...; INS" still count as statement start). Write keywords are filtered

(statement string, pos int)

// only here (in the query scene) so keywords valid inside read statements are
// preserved in other positions.
func caretAtStatementStart(statement string, pos int) bool {
	if pos > len(statement) {
		pos = len(statement)
	}
	before := stripStringsAndComments(statement)[:pos]
	before = strings.TrimRight(before, identifierChars) // drop the partial identifier
	before = strings.TrimRight(before, " \t\r\n")
	return before == "" || before[len(before)-1] == ';'
}

func caretInsideBacktickIdentifier(statement string, pos int) bool {
	if pos > len(statement) {