christoph/lecture-compilers
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logging + grammar update

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ChUrl
2020-12-15 16:22:12 +01:00
parent 643a1c0e51
commit 09ff65fd95
1 changed files with 14 additions and 11 deletions
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25
src/main/java/parser/ast/ASTBalancer.java
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@ -82,7 +82,7 @@ public final class ASTBalancer {
leftPrecedence(child);
}
ASTNode expr = getExpr(root);
final ASTNode expr = getExpr(root);
if (expr == null || root.getChildren().size() != 2 || !root.getValue().isEmpty()) {
return;
@ -97,8 +97,10 @@ public final class ASTBalancer {
// Die Letzte Rotation ist keine richtige Rotation, dort wird false zurückgegeben
private static boolean specialLeftRotate(ASTNode root) {
ASTNode left = root.getChildren().get(0);
ASTNode right = root.getChildren().get(1);
log("Special-Left-Rotation around " + root.getName());
final ASTNode left = root.getChildren().get(0);
final ASTNode right = root.getChildren().get(1);
// Verhindert Wurzel mit nur einem EXPR-Child (nach oben "hängende" Wurzel)
if (endOfExpr(right)) {
@ -108,7 +110,7 @@ public final class ASTBalancer {
return false; // Braucht keine weitere Rotation
}
ASTNode insertLeft = new ASTNode(root.getName(), root.getLine());
final ASTNode insertLeft = new ASTNode(root.getName(), root.getLine());
insertLeft.setValue(right.getValue()); // Operation wird linksvererbt
insertLeft.setChildren(left, right.getChildren().get(0));
@ -118,9 +120,10 @@ public final class ASTBalancer {
return true;
}
// Findet die 1te (linkeste) expr
private static ASTNode getExpr(ASTNode root) {
for (ASTNode child : root.getChildren()) {
if ("EXPR".equals(child.getName())) {
if ("expr".equals(child.getName())) {
return child;
}
}
@ -158,8 +161,8 @@ public final class ASTBalancer {
}
private static boolean preceding(ASTNode parent, ASTNode child) {
if (!"EXPR".equals(parent.getName()) || parent.getValue().isEmpty()
|| !"EXPR".equals(child.getName()) || child.getValue().isEmpty()) {
if (!"expr".equals(parent.getName()) || parent.getValue().isEmpty()
|| !"expr".equals(child.getName()) || child.getValue().isEmpty()) {
return false;
}
@ -168,12 +171,12 @@ public final class ASTBalancer {
}
private static void simpleRightRotate(ASTNode root) {
ASTNode left = root.getChildren().get(0);
ASTNode right = root.getChildren().get(1);
log("Right-Rotation around " + root.getName() + ": " + root.getValue());
log("Right-Rotating " + root.getName() + ": " + root.getValue());
final ASTNode left = root.getChildren().get(0);
final ASTNode right = root.getChildren().get(1);
ASTNode insertRight = new ASTNode(root.getName(), root.getLine());
final ASTNode insertRight = new ASTNode(root.getName(), root.getLine());
insertRight.setValue(root.getValue());
insertRight.setChildren(left.getChildren().get(1), right);