-- FastDirDefs.mesa  edited: Bruce  July 8, 1980  8:38 AM
-- Copyright  Xerox Corporation 1979, 1980

DIRECTORY
  AltoFileDefs USING [FP],
  Mopcodes USING [zAND];

FastDirDefs: DEFINITIONS =
  BEGIN OPEN AltoFileDefs, Mopcodes;
  
  UpCase: CARDINAL = 137B;
  HashVal: TYPE = [0..1000);
  FileType: TYPE = {source, bcd, config, symbols, code, image};
  
  --extensions: ARRAY FileType OF STRING = ["mesa", "bcd", "config", "symbols", "code", "image"];
  
  FileSwitches: TYPE = PACKED ARRAY FileType OF BOOLEAN;
  NilFileSwitches: FileSwitches = [FALSE, FALSE, FALSE, FALSE, FALSE, FALSE];
  -- ALL [FALSE] later
  
  AllFileSwitches: FileSwitches = [TRUE, TRUE, TRUE, TRUE, TRUE, TRUE];
  -- ALL [TRUE] later
  
  StringItem: TYPE = RECORD [
    link: POINTER TO StringItem, hash: HashVal, s: STRING];
  
  ItemHandle: TYPE = POINTER TO Item;
  Item: TYPE = RECORD [link: POINTER TO Item, hash: WORD, name: STRING, fp: FP];
  
  EnumerateList: PROCEDURE [
    ft: FileType, proc: PROCEDURE [ItemHandle] RETURNS [BOOLEAN]]
    RETURNS [ItemHandle];
  EquivalentString: PROCEDURE [s1, s2: STRING] RETURNS [BOOLEAN];
  GetExtension: PROCEDURE [ft: FileType] RETURNS [ext: STRING];
  LocalDir: PROCEDURE [PROCEDURE [POINTER TO FP, STRING] RETURNS [BOOLEAN]] =
    LOOPHOLE[3];
  LookupItem: PROCEDURE [s: STRING, t: FileType] RETURNS [p: ItemHandle];
  ScanDir: PROCEDURE [
    files: FileSwitches,
    proc: PROCEDURE [PROCEDURE [POINTER TO FP, STRING] RETURNS [BOOLEAN]] _
      LocalDir];
  StripExtension: PROCEDURE [name, ext: STRING];
  StripSwitches: PROCEDURE [name, switches: STRING];
  
  Cap: PROCEDURE [c: CHARACTER] RETURNS [CHARACTER] = INLINE
    BEGIN RETURN[IF c IN ['a..'z] THEN LOOPHOLE[CharMask[c, UpCase]] ELSE c] END;
    
  CharMask: PROCEDURE [CHARACTER, CARDINAL] RETURNS [CARDINAL] = MACHINE CODE
    BEGIN zAND END;
    
  Hash: PROCEDURE [s: STRING] RETURNS [HashVal] = INLINE
    BEGIN
    RETURN[
      (CharMask[s[0], UpCase]*s.length + CharMask[s[s.length/2], UpCase]) MOD
	(LAST[HashVal] + 1)];
    END;
    
  
  END.