Source file sql_parser.ml
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(** SQL statement splitter. *)
type state =
| Normal
| Single_quote
| Double_quote
| Backtick
| Dollar_quote of string
let is_space c = c = ' ' || c = '\t' || c = '\n' || c = '\r'
let is_blank c = c = ' ' || c = '\t'
let split_sql ?(backslash_escapes = false) (sql : string) : string list =
let n = String.length sql in
let buf = Buffer.create 256 in
let statements = ref [] in
let has_content = ref false in
let finish () =
let stmt = String.trim (Buffer.contents buf) in
if !has_content && stmt <> "" then statements := stmt :: !statements;
Buffer.clear buf;
has_content := false
in
let char_at i = if i < n then sql.[i] else '\000' in
let read_dollar_tag i =
let j = ref (i + 1) in
while
!j < n
&&
let c = sql.[!j] in
(c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z')
|| (c >= '0' && c <= '9')
|| c = '_'
do
incr j
done;
if !j < n && sql.[!j] = '$' then Some (String.sub sql i (!j - i + 1), !j + 1)
else None
in
let parse_delimiter_directive i =
let j = ref i in
while !j < n && is_blank sql.[!j] do
incr j
done;
let kw = "delimiter" and klen = 9 in
if
!j + klen <= n
&& String.lowercase_ascii (String.sub sql !j klen) = kw
&& (!j + klen >= n || is_blank sql.[!j + klen])
then begin
let k = ref (!j + klen) in
while !k < n && is_blank sql.[!k] do
incr k
done;
let s = !k in
while !k < n && not (is_space sql.[!k]) do
incr k
done;
let token = String.sub sql s (!k - s) in
while !k < n && sql.[!k] <> '\n' do
incr k
done;
let after = if !k < n then !k + 1 else !k in
if token = "" then None else Some (token, after)
end
else None
in
let matches_delim delim i =
let dl = String.length delim in
dl > 0 && i + dl <= n && String.sub sql i dl = delim
in
let rec scan state delim line_start i =
if i >= n then finish ()
else
let c = sql.[i] in
match state with
| Normal -> (
match if line_start then parse_delimiter_directive i else None with
| Some (new_delim, after) ->
finish ();
scan Normal new_delim true after
| None ->
if matches_delim delim i then (
finish ();
scan Normal delim false (i + String.length delim))
else if c = '-' && char_at (i + 1) = '-' then (
Buffer.add_string buf "--";
scan Line_comment delim false (i + 2))
else if c = '/' && char_at (i + 1) = '*' then (
Buffer.add_string buf "/*";
scan (Block_comment 1) delim false (i + 2))
else if c = '\'' then (
Buffer.add_char buf c;
has_content := true;
scan Single_quote delim false (i + 1))
else if c = '"' then (
Buffer.add_char buf c;
has_content := true;
scan Double_quote delim false (i + 1))
else if c = '`' then (
Buffer.add_char buf c;
has_content := true;
scan Backtick delim false (i + 1))
else if c = '$' then (
match read_dollar_tag i with
| Some (tag, next) ->
Buffer.add_string buf tag;
has_content := true;
scan (Dollar_quote tag) delim false next
| None ->
Buffer.add_char buf c;
has_content := true;
scan Normal delim false (i + 1))
else (
Buffer.add_char buf c;
if not (is_space c) then has_content := true;
let line_start' = c = '\n' || (line_start && is_blank c) in
scan Normal delim line_start' (i + 1)))
| Line_comment ->
Buffer.add_char buf c;
if c = '\n' then scan Normal delim true (i + 1)
else scan Line_comment delim false (i + 1)
| Block_comment depth ->
if c = '*' && char_at (i + 1) = '/' then (
Buffer.add_string buf "*/";
if depth = 1 then scan Normal delim false (i + 2)
else scan (Block_comment (depth - 1)) delim false (i + 2))
else if c = '/' && char_at (i + 1) = '*' then (
Buffer.add_string buf "/*";
scan (Block_comment (depth + 1)) delim false (i + 1 + 1))
else (
Buffer.add_char buf c;
scan (Block_comment depth) delim false (i + 1))
| Single_quote ->
if backslash_escapes && c = '\\' && i + 1 < n then (
Buffer.add_char buf c;
Buffer.add_char buf (char_at (i + 1));
scan Single_quote delim false (i + 2))
else if c = '\'' then
if char_at (i + 1) = '\'' then (
Buffer.add_string buf "''";
scan Single_quote delim false (i + 2))
else (
Buffer.add_char buf c;
scan Normal delim false (i + 1))
else (
Buffer.add_char buf c;
scan Single_quote delim false (i + 1))
| Double_quote ->
if c = '"' then
if char_at (i + 1) = '"' then (
Buffer.add_string buf "\"\"";
scan Double_quote delim false (i + 2))
else (
Buffer.add_char buf c;
scan Normal delim false (i + 1))
else (
Buffer.add_char buf c;
scan Double_quote delim false (i + 1))
| Backtick ->
if c = '`' then
if char_at (i + 1) = '`' then (
Buffer.add_string buf "``";
scan Backtick delim false (i + 2))
else (
Buffer.add_char buf c;
scan Normal delim false (i + 1))
else (
Buffer.add_char buf c;
scan Backtick delim false (i + 1))
| Dollar_quote tag ->
let tl = String.length tag in
if c = '$' && i + tl <= n && String.sub sql i tl = tag then (
Buffer.add_string buf tag;
scan Normal delim false (i + tl))
else (
Buffer.add_char buf c;
scan (Dollar_quote tag) delim false (i + 1))
in
scan Normal ";" true 0;
List.rev !statements