134 lines
3.1 KiB
Modula-2
134 lines
3.1 KiB
Modula-2
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MODULE BoldFormatter;
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(* From: MODULA-2, An Introduction, by Daniel Thalmann, Springer-Verlag,
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New York, 1985
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Figure 18.2
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*)
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FROM InOut IMPORT Done, EOL, Read, Write, OpenInput, OpenOutput, CloseInput, CloseOutput;
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CONST
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N = 40;
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WordLength = 32;
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TYPE
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alpha = ARRAY [0..14] OF CHAR;
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VAR
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ch : CHAR;
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i, j, k, l, m, r : CARDINAL;
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id : ARRAY [0..WordLength] OF CHAR;
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key : ARRAY [1..N] OF alpha;
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PROCEDURE copy;
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BEGIN
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Write(ch); Read(ch);
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END copy;
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PROCEDURE InitTable;
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BEGIN
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key[ 1] := "AND ";
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key[ 2] := "ARRAY ";
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key[ 3] := "BEGIN ";
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key[ 4] := "BY ";
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key[ 5] := "CASE ";
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key[ 6] := "CONST ";
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key[ 7] := "DEFINITION ";
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key[ 8] := "DIV ";
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key[ 9] := "DO ";
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key[10] := "ELSE ";
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key[11] := "ELSIF ";
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key[12] := "END ";
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key[13] := "EXIT ";
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key[14] := "EXPORT ";
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key[15] := "FOR ";
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key[16] := "FROM ";
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key[17] := "IF ";
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key[18] := "IMPLEMENTATION ";
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key[19] := "IMPORT ";
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key[20] := "IN ";
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key[21] := "LOOP ";
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key[22] := "MOD ";
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key[23] := "MODULE ";
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key[24] := "NOT ";
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key[25] := "OF ";
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key[26] := "OR ";
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key[27] := "POINTER ";
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key[28] := "PROCEDURE ";
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key[29] := "QUALIFIED ";
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key[30] := "RECORD ";
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key[31] := "REPEAT ";
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key[32] := "RETURN ";
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key[33] := "SET ";
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key[34] := "THEN ";
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key[35] := "TO ";
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key[36] := "TYPE ";
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key[37] := "UNTIL ";
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key[38] := "VAR ";
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key[39] := "WHILE ";
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key[40] := "WITH ";
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END InitTable;
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PROCEDURE Identifier() : BOOLEAN;
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BEGIN
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l := 1; r := N; id[k] := " ";
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REPEAT
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m := (l + r) DIV 2;
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i := 0;
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WHILE (id[i]=key[m,i]) AND (id[i]#" ") DO i := i+1; END;
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IF id[i] <= key[m,i] THEN r := m-1; END;
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IF id[i] >= key[m,i] THEN l := m+1; END;
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UNTIL l > r;
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RETURN l = r+1;
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END Identifier;
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BEGIN
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InitTable;
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OpenInput("mod");
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OpenOutput("text");
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IF NOT Done THEN HALT; END;
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Read(ch);
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REPEAT
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IF (CAP(ch) >= "A") AND (CAP(ch) <= "Z") THEN
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k := 0;
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REPEAT
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id[k] := ch; k := k+1;
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Read(ch);
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UNTIL (ch<"0") OR (ch>"9") AND (CAP(ch)<"A") OR (CAP(ch)>"Z");
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IF Identifier() THEN
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FOR i:= 0 TO k-1 DO
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Write(id[i]);
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END;
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ELSE
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FOR i := 0 TO k-1 DO
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Write(id[i]); Write(10C); Write(id[i]); Write(10C); Write(id[i]);
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END;
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END
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ELSIF (ch >= "0") AND (ch <= "9") THEN
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REPEAT copy;
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UNTIL ((ch<"0") OR (ch>"9")) AND ((ch < "A") OR (ch > "Z"))
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ELSIF ch="(" THEN
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copy;
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IF ch = "*" THEN
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REPEAT
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REPEAT
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copy;
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UNTIL ch = "*";
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copy;
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UNTIL ch = ")";
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END
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ELSIF ch = "'" THEN
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REPEAT copy; UNTIL ch = "'";
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copy;
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ELSIF ch='"' THEN
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REPEAT copy; UNTIL ch = '"';
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copy
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ELSE copy;
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END;
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UNTIL NOT Done;
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CloseInput;
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CloseOutput;
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END BoldFormatter.
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