181 lines
3.4 KiB
Plaintext
181 lines
3.4 KiB
Plaintext
(*
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BSD 2-Clause License
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Copyright (c) 2018-2019, Anton Krotov
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All rights reserved.
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*)
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MODULE TEXTDRV;
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IMPORT FILES, C := COLLECTIONS;
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CONST
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CR = 0DX; LF = 0AX;
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CHUNK = 1024 * 256;
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TYPE
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TEXT* = POINTER TO RECORD (C.ITEM)
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chunk: ARRAY CHUNK OF CHAR;
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pos, size: INTEGER;
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file: FILES.FILE;
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utf8: BOOLEAN;
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CR: BOOLEAN;
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line*, col*: INTEGER;
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eof*: BOOLEAN;
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eol*: BOOLEAN;
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peak*: CHAR
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END;
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VAR
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texts: C.COLLECTION;
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PROCEDURE load (text: TEXT);
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BEGIN
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IF ~text.eof THEN
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text.size := FILES.read(text.file, text.chunk, LEN(text.chunk));
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text.pos := 0;
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IF text.size = 0 THEN
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text.eof := TRUE;
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text.chunk[0] := 0X
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END;
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text.peak := text.chunk[0]
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END
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END load;
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PROCEDURE next* (text: TEXT);
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VAR
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c: CHAR;
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BEGIN
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IF text.pos < text.size - 1 THEN
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INC(text.pos);
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text.peak := text.chunk[text.pos]
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ELSE
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load(text)
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END;
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IF ~text.eof THEN
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c := text.peak;
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IF c = CR THEN
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INC(text.line);
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text.col := 0;
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text.eol := TRUE;
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text.CR := TRUE
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ELSIF c = LF THEN
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IF ~text.CR THEN
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INC(text.line);
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text.col := 0;
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text.eol := TRUE
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ELSE
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text.eol := FALSE
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END;
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text.CR := FALSE
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ELSE
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text.eol := FALSE;
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IF text.utf8 THEN
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IF ORD(c) DIV 64 # 2 THEN
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INC(text.col)
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END
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ELSE
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INC(text.col)
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END;
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text.CR := FALSE
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END
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END
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END next;
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PROCEDURE init (text: TEXT);
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BEGIN
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IF (text.pos = 0) & (text.size >= 3) THEN
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IF (text.chunk[0] = 0EFX) &
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(text.chunk[1] = 0BBX) &
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(text.chunk[2] = 0BFX) THEN
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text.pos := 3;
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text.utf8 := TRUE
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END
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END;
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IF text.size = 0 THEN
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text.chunk[0] := 0X;
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text.size := 1;
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text.eof := FALSE
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END;
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text.line := 1;
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text.col := 1;
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text.peak := text.chunk[text.pos]
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END init;
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PROCEDURE close* (VAR text: TEXT);
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BEGIN
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IF text # NIL THEN
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IF text.file # NIL THEN
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FILES.close(text.file)
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END;
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C.push(texts, text);
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text := NIL
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END
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END close;
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PROCEDURE open* (name: ARRAY OF CHAR): TEXT;
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VAR
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text: TEXT;
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citem: C.ITEM;
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BEGIN
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citem := C.pop(texts);
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IF citem = NIL THEN
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NEW(text)
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ELSE
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text := citem(TEXT)
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END;
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IF text # NIL THEN
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text.chunk[0] := 0X;
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text.pos := 0;
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text.size := 0;
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text.utf8 := FALSE;
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text.CR := FALSE;
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text.line := 1;
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text.col := 1;
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text.eof := FALSE;
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text.eol := FALSE;
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text.peak := 0X;
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text.file := FILES.open(name);
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IF text.file # NIL THEN
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load(text);
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init(text)
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ELSE
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close(text)
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END
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END
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RETURN text
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END open;
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BEGIN
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texts := C.create()
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END TEXTDRV.
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