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|
(** This module provide functions used to parse the strings. *)
exception Out_of_context
let space = [%sedlex.regexp? ' ' | '\t']
let spaces = [%sedlex.regexp? Plus space]
let single_quote = [%sedlex.regexp? '\'']
let double_quote = [%sedlex.regexp? '"']
let leave_text end_wrapper buf buffer =
Lexbuf.leave_state buffer;
Lexbuf.enter_state buffer (Lexbuf.EndString end_wrapper);
Lexbuf.rollback buffer;
Tokens.LITERAL (Buffer.contents buf)
let rec nestedQuotedStringWraper : Lexbuf.stringWraper =
let start_string f buffer =
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
(* There is no more way to add start a quoted string here *)
| _ -> f buffer
in
{
start_string;
wrap =
(fun f ?(nested = false) buf buffer ->
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| "''" -> leave_text nestedQuotedStringWraper buf buffer
| _ -> f ~nested buf buffer);
end_string =
(fun buffer ->
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| "''" ->
Lexbuf.leave_state buffer;
TEXT_MARKER
| _ -> raise Not_found);
}
and nestedDquotedStringWraper : Lexbuf.stringWraper =
let start_string f buffer =
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
(* There is no more way to add start a quoted string here *)
| _ -> f buffer
in
let rec wrap (f : Lexbuf.buffer_builder) ?(nested = false) buf buffer =
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| double_quote ->
Buffer.add_char buf '"';
wrap ~nested:true f buf buffer
| double_quote, double_quote ->
leave_text nestedDquotedStringWraper buf buffer
| _ -> f ~nested buf buffer
in
{
start_string;
wrap;
end_string =
(fun buffer ->
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| double_quote, double_quote ->
Lexbuf.leave_state buffer;
TEXT_MARKER
| _ -> raise Not_found);
}
and quotedStringWraper : Lexbuf.stringWraper =
let rec start_string f buffer =
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| spaces -> start_string f buffer
| single_quote -> raise Out_of_context
| single_quote, single_quote ->
Lexbuf.enter_state buffer (Lexbuf.String nestedQuotedStringWraper);
Tokens.TEXT_MARKER
| _ -> f buffer
in
let rec quoted_wrap (f : Lexbuf.buffer_builder) ?(nested = false) buf buffer =
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| single_quote, single_quote ->
Buffer.add_char buf '\'';
quoted_wrap ~nested f buf buffer
| single_quote -> leave_text quotedStringWraper buf buffer
| _ -> f ~nested buf buffer
in
{
start_string;
wrap = quoted_wrap;
end_string =
(fun buffer ->
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| single_quote ->
Lexbuf.leave_state buffer;
TEXT_MARKER
| _ -> raise Not_found);
}
and dQuotedStringWraper : Lexbuf.stringWraper =
let rec wrap (f : Lexbuf.buffer_builder) ?(nested = false) buf buffer =
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| single_quote ->
if nested then (
Buffer.add_char buf '\'';
wrap ~nested:false f buf buffer)
else (
Buffer.add_char buf '\'';
wrap ~nested:true f buf buffer)
| double_quote, double_quote ->
Buffer.add_char buf '"';
wrap f buf buffer
| double_quote -> leave_text dQuotedStringWraper buf buffer
| _ -> f ~nested buf buffer
in
let rec start_string f buffer =
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| spaces -> start_string f buffer
| double_quote -> raise Out_of_context
| double_quote, double_quote ->
Lexbuf.enter_state buffer (Lexbuf.String nestedDquotedStringWraper);
Tokens.TEXT_MARKER
| _ -> f buffer
in
{
start_string;
wrap;
end_string =
(fun buffer ->
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| double_quote ->
Lexbuf.leave_state buffer;
TEXT_MARKER
| _ -> raise Not_found);
}
let defaultWraper : Lexbuf.stringWraper =
let rec start_string f buffer =
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| spaces -> start_string f buffer
| single_quote ->
Lexbuf.enter_state buffer (Lexbuf.String quotedStringWraper);
Tokens.TEXT_MARKER
| double_quote ->
Lexbuf.enter_state buffer (Lexbuf.String dQuotedStringWraper);
Tokens.TEXT_MARKER
| '{' ->
Lexbuf.enter_state buffer (Lexbuf.MString 0);
Tokens.TEXT_MARKER
| _ -> f buffer
in
{
start_string;
wrap =
(fun _f ?nested _buf _buffer ->
ignore nested;
raise Out_of_context);
end_string = (fun _buffer -> raise Out_of_context);
}
let readLongStringWraper : Lexbuf.stringWraper =
{
defaultWraper with
end_string =
(fun buffer ->
let lexbuf = Lexbuf.buffer buffer in
match%sedlex lexbuf with
| "}" ->
Lexbuf.leave_state buffer;
TEXT_MARKER
| _ -> raise Not_found);
}
|
