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/* e.g.
overlay <- ScreenOverlay
bounds <- rightScreenBounds
overlay bounds bounds
overlay show
*/
sclass GazelleV_LeftArrowScriptParser > SimpleLeftToRightParser {
replace Toolbox with GazelleV_LeftArrowScript.
delegate Script to GazelleV_LeftArrowScript.
new Script script;
new LinkedHashSet knownVars;
// object can be a class
srecord MethodOnObject(O object, S method) {}
Script parse(S text) {
setText(text);
while (mainLoop()) {
S t = token();
if (isIdentifier(t) && eq(token(1), "<") && eq(token(2), "-")) {
next(3);
knownVars.add(t);
script.add(new Toolbox.Assignment(t, parseExpr()));
} else
script.add(parseExpr());
}
ret script;
}
Evaluable parseOptionalExpression() {
if (lineBreak()) null;
ret parseExpr();
}
Evaluable parseExpr() {
if (atEnd()) null;
S t = tpp();
print(+t);
if (knownVars.contains(t))
ret parseCall(new Toolbox.GetVar(t));
O o = findExternalObject(t);
if (o == null)
fail("Unknown object: " + t);
else if (o cast Class)
ret new NewObject(o);
else if (o cast MethodOnObject)
ret new Toolbox.CallMethod(new Toolbox.Const(o.object), o.method, parseExpressions());
else
ret parseCall(new Toolbox.Const(o));
}
L parseExpressions() {
ret collectWhileNotNull(-> parseOptionalExpression());
}
Evaluable parseCall(Evaluable target) {
if (atEndOrLineBreak()) ret target;
S methodName = tpp();
var args = parseExpressions();
ret new CallMethod(target, methodName, args);
}
// can return MethodOnObject
swappable O findExternalObject(S name) { null; }
}