PrettyPrintCommands:
CEDAR
PROGRAM
IMPORTS Commander, Interpreter, IO, List, PrintTV, Rope, StructuredStreams, SymTab, UnparserBuffer =
PrettyPrint:
PROC [cmd: Commander.Handle]
RETURNS [result:
REF
ANY ←
NIL, msg:
ROPE ←
NIL]
--Commander.CommandProc-- =
BEGIN
thisDepth: INT ← depth;
thisMaxLength: INT ← maxLength;
thisWidth: INT ← width;
thisVerbose: BOOLEAN ← verbose;
noResult: BOOL;
exprRope: ROPE;
val: AMTypes.TV;
errRope: ROPE;
in: IO.STREAM ← IO.RIS[cmd.commandLine];
out: IO.STREAM ← cmd.out;
ubh: UnparserBuffer.Handle ← UnparserBuffer.NewInittedHandle[[output: [stream[out]]]];
put: IO.STREAM;
symTab: SymTab.Ref;
DO
switch: CHAR;
sticky: BOOLEAN ← FALSE;
[] ← in.SkipWhitespace[];
IF in.EndOf[]
THEN
RETURN [NIL, "No expression to PrettyPrint"];
IF in.PeekChar[] # '/ THEN EXIT;
IF in.GetChar[] # '/ THEN ERROR;
IF in.EndOf[] THEN RETURN [NIL, "No switch after slash"];
IF in.PeekChar[] = '/
THEN
BEGIN
IF in.GetChar[] # '/ THEN ERROR;
sticky ← TRUE;
IF in.EndOf[] THEN RETURN [NIL, "No switch after double slash"];
END;
switch ← in.GetChar[];
[] ← in.SkipWhitespace[];
IF (IF NOT in.EndOf[] THEN in.PeekChar[] = ': ELSE FALSE) THEN [] ← in.GetChar[];
IF Rope.Find["vVwWdDlL", Rope.FromChar[switch]] >= 0
THEN {
IF in.EndOf[]
THEN
RETURN [NIL, "No value for switch"];
}
ELSE RETURN [NIL, "Invalid switch"];
SELECT switch
FROM
'v, 'V => {thisVerbose ← in.GetBool[]; IF sticky THEN verbose ← thisVerbose};
'l, 'L => {thisMaxLength ← in.GetInt[]; IF sticky THEN maxLength ← thisMaxLength};
'd, 'D => {thisDepth ← in.GetInt[]; IF sticky THEN depth ← thisDepth};
'w, 'W => {thisWidth ← in.GetInt[]; IF sticky THEN width ← thisWidth};
ENDCASE => NULL;
ENDLOOP;
ubh.margin ← thisWidth;
put ← StructuredStreams.Create[ubh];
exprRope ← in.GetLineRope[];
TRUSTED {symTab ← LOOPHOLE[List.Assoc[$SymTab, cmd.propertyList]]};
IF symTab =
NIL
THEN {
symTab ← SymTab.Create[];
[] ← List.PutAssoc[key: $SymTab, val: symTab, aList: cmd.propertyList];
};
[val, errRope, noResult] ← Interpreter.Evaluate[rope: exprRope, symTab: symTab];
IF errRope.Length[] # 0
THEN out.PutRope[Rope.Cat["Error: ", errRope]]
ELSE IF noResult
THEN out.PutRope["(No result)"]
ELSE PrintTV.Print[tv: val, put: put, depth: thisDepth, width: thisMaxLength, verbose: thisVerbose];
put.PutRope["\n"];
put.Close[];
END;
Commander.Register[key: "PrettyPrint", proc: PrettyPrint, interpreted:
FALSE, doc: "
PrettyPrint (/v bool | /d int | /l int | /w int)* expression
evaluates the expression and prettily prints it. The switches may give values for the verbosity (default FALSE), depth (default 4), maximum list length (default 32), and target width (default 60) of the printout. Doubling slash makes it sticky."];