Function parse_function_body 

pub fn parse_function_body(body: &str) -> Result<PlPgSqlBlock, ParseError>

v7.12.4 — parse a PL/pgSQL function body (the bytes between $$ ... $$). Returns the parsed BEGIN ... END; block.

v7.12.4 grammar (strict subset — IF / LOOP / DECLARE / RAISE / embedded SQL land in v7.12.5+):

  body          := [ws] block [ws]
  block         := BEGIN stmt ( ; stmt )* [ ; ] END [ ; ]
  stmt          := assign | return
  assign        := assign_target := expr
  assign_target := ( NEW | OLD ) . ident | ident
  return        := RETURN ( NEW | OLD | NULL | expr )

expr is parsed by recursing into the regular Parser — so a PL/pgSQL NEW.search_vector := to_tsvector('english', NEW.subject || ' ' || NEW.sender) body shape works without the body parser knowing what to_tsvector is.

Errors here cause the caller to fall back to FunctionBody::Raw — keeping the CREATE FUNCTION DDL itself successful, but the executor will refuse to invoke the function with an “unparseable body” error. v7.12.4 — public alias for [parse_plpgsql_body] re-exported from the crate root as spg_sql::parse_function_body.