(*
Copyright 2016, 2019, 2022, 2023 Anton Krotov
This file is part of fb2read.
fb2read is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
fb2read is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with fb2read. If not, see <http://www.gnu.org/licenses/>.
*)
MODULE Strings;
IMPORT sys := SYSTEM, Encoding;
TYPE
STRING* = ARRAY 1024 OF CHAR;
CHARS* = RECORD first*, last* : INTEGER END;
VAR
CS: BOOLEAN;
PROCEDURE [ccall, "base64.obj", ""] base64_decode (inp, outp: INTEGER; Len: INTEGER): INTEGER; END;
PROCEDURE [stdcall, "rasterworks.obj", ""] countUTF8Z (string, byteQuantity: INTEGER): INTEGER; END;
PROCEDURE DelLeft(VAR s: STRING; count: INTEGER);
VAR i, max: INTEGER;
BEGIN
max := LENGTH(s) - count - 1;
IF max >= 0 THEN
FOR i := 0 TO max DO
s[i] := s[i + count]
END
END
END DelLeft;
PROCEDURE Trim*(VAR s: STRING; ch: CHAR);
VAR i, n: INTEGER;
BEGIN
i := 0;
WHILE s[i] = ch DO
INC(i)
END;
DelLeft(s, i);
n := LENGTH(s) - 1;
IF n >= 0 THEN
i := n;
WHILE s[i] = ch DO
DEC(i)
END;
IF n # i THEN
s[i + 1] := 0X
END
END
END Trim;
PROCEDURE GetChar*(chars: CHARS; i: INTEGER): CHAR;
VAR c: CHAR;
BEGIN
ASSERT(chars.first + i <= chars.last);
sys.GET(chars.first + i, c)
RETURN c
END GetChar;
PROCEDURE Reverse*(VAR s: ARRAY OF CHAR);
VAR i, j: INTEGER; c: CHAR;
BEGIN
i := 0;
j := LENGTH(s) - 1;
WHILE i < j DO
c := s[i];
s[i] := s[j];
s[j] := c;
INC(i);
DEC(j)
END
END Reverse;
PROCEDURE IntToString*(x: INTEGER; VAR s: STRING);
VAR n, i: INTEGER;
BEGIN
i := 0;
REPEAT
n := x MOD 10;
x := x DIV 10;
s[i] := CHR(ORD("0") + n);
INC(i)
UNTIL x = 0;
s[i] := 0X;
Reverse(s)
END IntToString;
PROCEDURE isdigit(c: CHAR): BOOLEAN;
RETURN ("0" <= c) & (c <= "9")
END isdigit;
PROCEDURE CharsToInt*(s: CHARS; VAR err: BOOLEAN): INTEGER;
VAR n, i, res, len: INTEGER; c: CHAR;
BEGIN
res := 0;
len := s.last - s.first + 1;
err := len <= 0;
FOR i := 0 TO s.last - s.first DO
c := GetChar(s, i);
IF isdigit(c) THEN
n := ORD(c) - ORD("0");
res := res * 10 + n
ELSE
err := TRUE
END
END
RETURN res
END CharsToInt;
PROCEDURE Append*(VAR str1: STRING; str2: STRING);
VAR
len1, len2 : INTEGER;
i, j : INTEGER;
BEGIN
len1 := LENGTH(str1);
len2 := LENGTH(str2);
ASSERT(len1 + len2 < LEN(str1));
j := len1;
FOR i := 0 TO len2 - 1 DO
str1[j] := str2[i];
INC(j)
END;
str1[j] := 0X
END Append;
PROCEDURE GetPath*(VAR S: STRING);
VAR i, j: INTEGER;
BEGIN
j := 0;
i := LENGTH(S) - 1;
WHILE i >= 0 DO
IF S[i] = "/" THEN
j := i;
i := 0
END;
DEC(i)
END;
S[j] := 0X
END GetPath;
PROCEDURE PutChar*(chars: CHARS; i: INTEGER; c: CHAR);
BEGIN
ASSERT(chars.first + i <= chars.last);
sys.PUT(chars.first + i, c)
END PutChar;
PROCEDURE StrToChars*(str: ARRAY OF CHAR; VAR chars: CHARS);
BEGIN
ASSERT(str # "");
chars.first := sys.ADR(str[0]);
chars.last := sys.ADR(str[LENGTH(str) - 1])
END StrToChars;
PROCEDURE PtrToString*(ptr: INTEGER; VAR S: STRING);
VAR i: INTEGER; c: CHAR;
BEGIN
i := 0;
REPEAT
sys.GET(ptr, c);
S[i] := c;
INC(i);
INC(ptr)
UNTIL (c = 0X) OR (i = LEN(S));
S[i - 1] := 0X
END PtrToString;
PROCEDURE CharsEq*(chars1, chars2: CHARS): BOOLEAN;
VAR
pos, len2 : INTEGER;
c1, c2 : CHAR;
Result : BOOLEAN;
PROCEDURE CAP(VAR c: CHAR);
BEGIN
IF ~CS & ("a" <= c) & (c <= "z") THEN
c := CHR(ORD(c) - 32)
END
END CAP;
BEGIN
pos := chars1.last - chars1.first;
len2 := chars2.last - chars2.first;
IF pos = len2 THEN
REPEAT
c1 := GetChar(chars1, pos);
c2 := GetChar(chars2, pos);
CAP(c1);
CAP(c2);
DEC(pos)
UNTIL (c1 # c2) OR (pos = -1);
Result := c1 = c2
ELSE
Result := FALSE
END
RETURN Result
END CharsEq;
PROCEDURE CharsEqStr*(chars: CHARS; str: STRING): BOOLEAN;
VAR
chars2: CHARS;
BEGIN
StrToChars(str, chars2)
RETURN CharsEq(chars, chars2)
END CharsEqStr;
PROCEDURE SetCS*(value: BOOLEAN);
BEGIN
CS := value
END SetCS;
PROCEDURE Utf8Length*(chars: CHARS): INTEGER;
RETURN countUTF8Z(chars.first, chars.last - chars.first + 1)
END Utf8Length;
PROCEDURE Replace*(VAR chars: CHARS; str1, str2: ARRAY OF CHAR);
VAR
temp: CHARS;
s : CHARS;
len1: INTEGER;
len2: INTEGER;
diff: INTEGER;
PROCEDURE Put(first, last, len1, len2, diff: INTEGER; str2: ARRAY OF CHAR);
VAR i: INTEGER; c: CHAR;
BEGIN
sys.MOVE(sys.ADR(str2[0]), first, len2);
FOR i := first + len1 TO last DO
sys.GET(i, c);
sys.PUT(i - diff, c);
END
END Put;
BEGIN
len1 := LENGTH(str1);
len2 := LENGTH(str2);
diff := len1 - len2;
ASSERT(diff >= 0);
ASSERT(len1 > 0);
StrToChars(str1, s);
temp := chars;
temp.last := temp.first + len1 - 1;
WHILE temp.last <= chars.last DO
IF CharsEq(temp, s) THEN
Put(temp.first, chars.last, len1, len2, diff, str2);
chars.last := chars.last - diff;
temp.first := temp.first + len2;
temp.last := temp.first + len1 - 1
ELSE
INC(temp.first);
INC(temp.last)
END
END
END Replace;
PROCEDURE EntOct*(VAR chars: CHARS): BOOLEAN;
VAR
i : INTEGER;
c : CHAR;
amp : BOOLEAN;
oct : BOOLEAN;
val : INTEGER;
exit : BOOLEAN;
str : STRING;
str2 : STRING;
uchar : Encoding.tUtf8;
res : BOOLEAN;
BEGIN
i := 0;
amp := FALSE;
oct := FALSE;
res := FALSE;
WHILE i <= chars.last - chars.first DO
c := GetChar(chars, i);
CASE c OF
|"&":
amp := TRUE;
oct := FALSE
|"#":
oct := amp;
amp := FALSE
|"0".."9":
IF oct THEN
val := 0;
str := "&#";
str2[1] := 0X;
exit := FALSE;
REPEAT
val := val * 10 + ORD(c) - ORD("0");
str2[0] := c;
Append(str, str2);
INC(i);
IF i <= chars.last - chars.first THEN
c := GetChar(chars, i)
ELSE
exit := TRUE
END
UNTIL ~isdigit(c) OR exit;
IF c = ";" THEN
str2[0] := c;
Append(str, str2);
Encoding.utf8(val, uchar);
Replace(chars, str, uchar);
res := TRUE;
i := chars.last - chars.first
ELSE
IF ~exit THEN
DEC(i);
amp := FALSE;
oct := FALSE
END
END
ELSE
amp := FALSE
END
ELSE
amp := FALSE;
oct := FALSE
END;
INC(i)
END
RETURN res
END EntOct;
PROCEDURE UCase*(VAR s: STRING);
VAR i, n: INTEGER; c: CHAR;
BEGIN
n := LENGTH(s) - 1;
FOR i := 0 TO n DO
c := s[i];
IF ("a" <= c) & (c <= "z") OR (0A0X <= c) & (c <= 0AFX) THEN
c := CHR(ORD(c) - 32)
ELSIF (0E0X <= c) & (c <= 0EFX) THEN
c := CHR(ORD(c) - 50H)
ELSIF (c = 0F1X) OR (c = 0F3X) OR (c = 0F5X) OR (c = 0F7X) THEN
c := CHR(ORD(c) - 1)
END;
s[i] := c
END
END UCase;
PROCEDURE Base64* (VAR chars: CHARS);
BEGIN
chars.last := chars.first + base64_decode(chars.first, chars.first, chars.last - chars.first + 1) - 1
END Base64;
BEGIN
CS := TRUE
END Strings.