Source file piq_lexer.ml
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module C = Piqi_common
open C.Std
module Utf8 = Piqi_utf8
exception Error0 of string
let error s =
raise (Error0 s)
let int_of_xstring s =
int_of_string ("0x" ^ s)
let int_of_ostring s =
int_of_string ("0o" ^ s)
type string_type =
| String_a
| String_b
| String_u
let classify_string s =
let res = ref String_a in
let len = String.length s in
let rec aux i =
if i = len
then !res
else begin
let w = Utf8.width.(Char.code s.[i]) in
if w > 0 && i + w <= len
then (
if w > 1 then res := String_u;
ignore (Utf8.next s i);
aux (i + w)
)
else raise Utf8.MalFormed
end
in
try aux 0
with Utf8.MalFormed -> String_b
let is_utf8_string s =
classify_string s <> String_b
let is_ascii_string s =
let len = String.length s in
let rec aux i =
if i >= len
then true
else
if Char.code s.[i] <= 127
then aux (i + 1)
else false
in
aux 0
let type_of_char c =
if c <= 127
then String_a
else String_b
let digit = [%sedlex.regexp? '0'..'9']
let odigit = [%sedlex.regexp? '0'..'7']
let xdigit = [%sedlex.regexp? '0'..'9' | 'a'..'f' | 'A'..'F']
let make_char c =
String_a, (Char.code c)
let escaped_lexeme lexbuf =
let len = Sedlexing.lexeme_length lexbuf in
Sedlexing.Utf8.sub_lexeme lexbuf 1 (len - 1)
let parse_string_escape lexbuf = [%sedlex match lexbuf with
| '\\' -> make_char '\\'
| '"' -> make_char '"'
| 't' -> make_char '\t'
| 'n' -> make_char '\n'
| 'r' -> make_char '\r'
| 'x', xdigit, xdigit ->
let c = int_of_xstring (escaped_lexeme lexbuf) in
(type_of_char c),c
| 'u', xdigit, xdigit, xdigit, xdigit ->
let c = int_of_xstring (escaped_lexeme lexbuf) in
String_u,c
| 'U', xdigit, xdigit, xdigit, xdigit, xdigit, xdigit, xdigit, xdigit ->
let c = int_of_xstring (escaped_lexeme lexbuf) in
String_u,c
| _ ->
let s = Sedlexing.Utf8.lexeme lexbuf in
error ("invalid string escape literal " ^ s)
]
let rec parse_string_literal ltype l lexbuf = [%sedlex match lexbuf with
| '\\' ->
let ctype, c = parse_string_escape lexbuf in
let ltype =
match ltype,ctype with
String_a, _ ->
ctype
| String_b, String_u -> error "invalid string literal"
| String_u, String_b -> error "invalid string literal"
| _,_ -> ltype
in
parse_string_literal ltype (c::l) lexbuf
| (0 .. 0x1F) | 127 ->
error "invalid string literal"
| eof ->
ltype,(List.rev l)
| any ->
let c = Sedlexing.lexeme_char lexbuf 0 in
let c = Uchar.to_int c in
let ltype =
match ltype with
String_b when c > 127 -> error "invalid string literal"
| _ when c > 127 -> String_u
| _ -> ltype
in
parse_string_literal ltype (c::l) lexbuf
| _ ->
let c = Sedlexing.lexeme_char lexbuf 0 in
let c = Uchar.to_int c in
error ("invalid string codepoint " ^ string_of_int c)
]
let utf8_of_list l =
let a = Array.of_list l in
Utf8.from_int_array a 0 (Array.length a)
let string_of_list l =
let s = Bytes.create (List.length l) in
let rec aux i = function
| [] -> ()
| h::t ->
Bytes.set s i (Char.chr h);
aux (i+1) t
in
aux 0 l;
Bytes.unsafe_to_string s
let parse_string_literal s =
let lexbuf = Sedlexing.Utf8.from_string s in
let str_type, l = parse_string_literal String_a [] lexbuf in
let parsed_str =
match str_type with
| String_u -> utf8_of_list l
| String_a | String_b -> string_of_list l
in
(str_type, parsed_str)
let add_ascii_char buf i =
let add c = Buffer.add_char buf c in
let add_escaped c = add '\\'; add c in
let c = Char.chr i in
match c with
| '\n' -> add_escaped 'n'
| '\r' -> add_escaped 'r'
| '\t' -> add_escaped 't'
| '"' | '\\' -> add_escaped c
| _ when i >= 20 && i < 127 -> add c
| _ ->
add '\\';
Buffer.add_string buf (Printf.sprintf "x%02x" i)
let escape_string s =
let len = String.length s in
let a = Utf8.to_int_array s 0 len in
let buf = Buffer.create (len + len / 10) in
for i = 0 to Array.length a - 1
do
let c = a.(i) in
if c <= 127
then
add_ascii_char buf c
else
Utf8.store buf c
done;
Buffer.contents buf
let escape_binary s =
let len = String.length s in
let buf = Buffer.create (len + len / 10) in
for i = 0 to len - 1
do
let c = Char.code s.[i] in
add_ascii_char buf c
done;
Buffer.contents buf
type token =
| Lpar
| Rpar
| Lbr
| Rbr
| Star
| Comma
| String of string_type * string * string
| Word of string
| Name of string
| Text of string
| EOF
| Raw_string of string
let newline = [%sedlex.regexp? '\n' | "\r\n"]
let ws = [%sedlex.regexp? Plus (' ' | '\t')]
let name = [%sedlex.regexp? (':' | '.'), Plus ('a'..'z' | 'A'..'Z' | '0'..'9' | '-' | '_' | '/' | '.' | ':')]
let string_literal = [%sedlex.regexp? '"', Star (Compl '"' | "\\\""), '"']
let first_word_char = [%sedlex.regexp? ('a'..'z' | 'A'..'Z' | '0'..'9' | '-' | '_')]
let word_char = [%sedlex.regexp? (first_word_char | '.' | '/')]
let word = [%sedlex.regexp? first_word_char, Star (word_char)]
let float_literal =
[%sedlex.regexp? ('0'..'9'), Star ('0'..'9' | '_'),
Opt ('.', Star ('0'..'9' | '_')),
Opt (('e' | 'E'), Opt ('+' | '-'), '0'..'9', Star ('0'..'9' | '_'))]
let is_valid_first_word_char = function
| 'a'..'z' | 'A'..'Z' | '0'..'9' | '-' | '_' -> true
| _ -> false
let is_valid_word_char = function
| '.' | '/' -> true
| x -> is_valid_first_word_char x
let is_valid_word s =
let len = String.length s in
let rec check_chars i =
if i >= len
then true
else
if is_valid_word_char s.[i]
then check_chars (i + 1)
else false
in
if len = 0
then false
else if not (is_valid_first_word_char s.[0])
then false
else check_chars 1
type buf =
{
lexbuf : Sedlexing.lexbuf;
mutable lcount : int;
mutable lstart : int;
mutable col : int;
mutable next_token : token option;
}
let make_buf lexbuf =
{
lexbuf = lexbuf;
lcount = 1;
lstart = 0;
col = 1;
next_token = None;
}
let update_line_counter buf =
buf.lcount <- buf.lcount + 1;
buf.lstart <- Sedlexing.lexeme_end buf.lexbuf
let get_column buf =
(Sedlexing.lexeme_start buf.lexbuf) - buf.lstart + 1
let update_column buf =
buf.col <- get_column buf
let error_location buf =
buf.lcount, get_column buf
let location buf =
buf.lcount, buf.col
let rec token0 buf lexbuf = [%sedlex match lexbuf with
| newline ->
update_line_counter buf;
token0 buf lexbuf
| ws -> token0 buf lexbuf
| '\r' ->
error "invalid character"
| "%%" ->
error "'%%' literal is reserved for future versions"
| '%', Opt ( Compl ('%' | '\n'), Star (Compl '\n') ), Opt newline ->
update_line_counter buf;
token0 buf lexbuf
| '#', Opt newline ->
Text ""
| '#', Compl ' ' ->
error "space is expected after '#'"
| '#', ' ', Star (Compl '\n'), Opt newline ->
let s = Sedlexing.Utf8.lexeme lexbuf in
let len = String.length s in
if len = 0
then Text ""
else
let chomp =
if s.[len-1] = '\n'
then 1
else if len > 1 && s.[len-2] = '\n' && s.[len-1] = '\r'
then 2
else 0
in
let s = String.sub s 2 (len - 2 - chomp) in
Text s
| '(' -> Lpar
| ')' -> Rpar
| '[' -> Lbr
| ']' -> Rbr
| '*' -> Star
| ',' -> Comma
| string_literal ->
let s = Sedlexing.Utf8.lexeme lexbuf in
let s = String.sub s 1 (String.length s - 2) in
let (str_type, parsed_str) = parse_string_literal s in
String (str_type, parsed_str, s)
| '"' -> error "string literal overrun"
| name ->
let s = Sedlexing.Utf8.lexeme lexbuf in
Name s
| word ->
let s = Sedlexing.Utf8.lexeme lexbuf in
Word s
| float_literal ->
let s = Sedlexing.Utf8.lexeme lexbuf in
Word s
| eof -> EOF
| _ -> error "invalid character"
]
type loc = int * int
exception Error of string * loc
let error buf s =
raise (Error (s, error_location buf))
let token1 buf =
try
let tok = token0 buf buf.lexbuf in
update_column buf;
(match tok with Text _ -> update_line_counter buf | _ -> ());
tok
with
| Error0 s -> error buf s
| Sedlexing.InvalidCodepoint i ->
error buf ("invalid unicode code point " ^ string_of_int i)
| Sedlexing.MalFormed ->
error buf "malformed utf-8"
let rollback buf tok =
buf.next_token <- Some tok
let token buf =
match buf.next_token with
| None ->
token1 buf
| Some tok ->
buf.next_token <- None; tok
let init_from_string s =
let lexbuf = Sedlexing.Utf8.from_string s in
make_buf lexbuf
let init_from_stream s =
let lexbuf = Sedlexing.Utf8.from_stream s in
make_buf lexbuf
let init_from_channel ch =
let lexbuf = Sedlexing.Utf8.from_channel ch in
make_buf lexbuf
let tokenize_string s =
let buf = init_from_string s in
let rec aux accu =
match token buf with
| EOF -> List.rev accu
| t -> aux (t::accu)
in
aux []