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< > BotCompany Repo | #1033980 // GazelleV_LeftArrowScriptParser [backup]

JavaX fragment (include)

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/* e.g.
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  overlay <- ScreenOverlay
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  bounds <- rightScreenBounds
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  overlay bounds bounds
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  overlay show
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*/
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sclass GazelleV_LeftArrowScriptParser > SimpleLeftToRightParser {
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  new Script script;
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  new LinkedHashSet<S> knownVars;
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  // object can be a class
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  srecord MethodOnObject(O object, S method) {}
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  interface Evaluable {
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    public O get(VarContext ctx default new);
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  }
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  // We're using SynchronizedList as a list wrapper
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  //sclass Script extends ArrayList<Evaluable> {
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  sclass Script extends SynchronizedList<Evaluable> is Evaluable {
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    *() { super(new L); }
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    public O get(VarContext ctx) {
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      O result = null;
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      for (step : this)
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        result = step.get(ctx);
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      ret result;
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    }
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  }
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  srecord noeq Assignment(S var, Evaluable expression) is Evaluable {
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    public O get(VarContext ctx) {
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      O o = expression.get(ctx);
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      ctx.set(var, o);
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      ret o;
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    }
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  }
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  srecord noeq NewObject(Class c) is Evaluable {
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    public O get(VarContext ctx) {
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      ret callConstructor(c);
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    }
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  }
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  srecord noeq GetVar(S var) is Evaluable {
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    public O get(VarContext ctx) {
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      ret ctx.get(var);
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    }
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  }
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  srecord noeq Const(O value) is Evaluable {
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    public O get(VarContext ctx) {
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      ret value;
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    }
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  }
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  srecord CallMethod(Evaluable target, S methodName, L<Evaluable> args) is Evaluable {
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    public O get(VarContext ctx) {
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      ret call(target.get(ctx), methodName, mapToArray(args, arg -> arg.get(ctx)));
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    }
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  }
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  Script parse(S text) {
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    setText(text);
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    while (mainLoop()) {
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      S t = token();
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      if (isIdentifier(t) && eq(token(1), "<") && eq(token(2), "-")) {
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        next(3);
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        knownVars.add(t);
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        script.add(new Assignment(t, parseExpr()));
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      } else
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        script.add(parseExpr());
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    }
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    ret script;
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  }
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  Evaluable parseOptionalExpression() {
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    if (lineBreak()) null;
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    ret parseExpr();
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  }
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  Evaluable parseExpr() {
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    if (atEnd()) null;
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    S t = tpp();
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    print(+t);
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    if (knownVars.contains(t))
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      ret parseCall(new GetVar(t));
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    O o = findExternalObject(t);
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    if (o == null)
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      fail("Unknown object: " + t);
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    else if (o cast Class)
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      ret new NewObject(o);
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    else if (o cast MethodOnObject)
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      ret new CallMethod(new Const(o.object), o.method, parseExpressions());
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    else
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      ret parseCall(new Const(o));
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  }
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  L<Evaluable> parseExpressions() {
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    ret collectWhileNotNull(-> parseOptionalExpression());
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  }
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  Evaluable parseCall(Evaluable target) {
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    if (atEndOrLineBreak()) ret target;
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    S methodName = tpp();
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    var args = parseExpressions();
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    ret new CallMethod(target, methodName, args);
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  }
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  // can return MethodOnObject
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  swappable O findExternalObject(S name) { null; }
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}

Author comment

Began life as a copy of #1033976

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Travelled to 3 computer(s): bhatertpkbcr, mowyntqkapby, mqqgnosmbjvj

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Snippet ID: #1033980
Snippet name: GazelleV_LeftArrowScriptParser [backup]
Eternal ID of this version: #1033980/1
Text MD5: d29bd5ca72aa81b2a559af24fa4eb77f
Author: stefan
Category: javax
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2022-01-15 05:17:02
Source code size: 2892 bytes / 117 lines
Pitched / IR pitched: No / No
Views / Downloads: 27 / 43
Referenced in: [show references]