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Add else if and else

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dfsek
2020-12-27 20:42:42 -07:00
parent f6312a01d7
commit 283495832f
5 changed files with 149 additions and 48 deletions
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134
common/src/main/java/com/dfsek/terra/api/structures/parser/Parser.java
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@@ -54,6 +54,7 @@ import java.util.List;
import java.util.Map;
import java.util.Set;
@SuppressWarnings("unchecked")
public class Parser {
private final String data;
private final Map<String, FunctionBuilder<? extends Function<?>>> functions = new HashMap<>();
@@ -111,7 +112,6 @@ public class Parser {
}
@SuppressWarnings("unchecked")
private Keyword<?> parseLoopLike(TokenHolder tokens, Map<String, Variable<?>> variableMap) throws ParseException {
Token identifier = tokens.consume();
@@ -119,56 +119,100 @@ public class Parser {
ParserUtil.checkType(tokens.consume(), Token.Type.GROUP_BEGIN);
if(identifier.getType().equals(Token.Type.FOR_LOOP)) {
Token f = tokens.get();
ParserUtil.checkType(f, Token.Type.NUMBER_VARIABLE, Token.Type.STRING_VARIABLE, Token.Type.BOOLEAN_VARIABLE, Token.Type.IDENTIFIER);
Item<?> initializer;
if(f.isVariableDeclaration()) {
Variable<?> forVar = parseVariableDeclaration(tokens, ParserUtil.getVariableReturnType(f));
ParserUtil.checkType(tokens.consume(), Token.Type.STRING_VARIABLE, Token.Type.BOOLEAN_VARIABLE, Token.Type.NUMBER_VARIABLE);
Token name = tokens.get();
if(functions.containsKey(name.getContent()) || variableMap.containsKey(name.getContent()) || builtinFunctions.contains(name.getContent()))
throw new ParseException(name.getContent() + " is already defined in this scope", name.getPosition());
initializer = parseAssignment(forVar, tokens, variableMap);
variableMap.put(name.getContent(), forVar);
} else initializer = parseExpression(tokens, true, variableMap);
ParserUtil.checkType(tokens.consume(), Token.Type.STATEMENT_END);
Returnable<?> conditional = parseExpression(tokens, true, variableMap);
ParserUtil.checkReturnType(conditional, Returnable.ReturnType.BOOLEAN);
ParserUtil.checkType(tokens.consume(), Token.Type.STATEMENT_END);
Item<?> incrementer;
Token token = tokens.get();
if(variableMap.containsKey(token.getContent())) { // Assume variable assignment
Variable<?> variable = variableMap.get(token.getContent());
incrementer = parseAssignment(variable, tokens, variableMap);
} else incrementer = parseFunction(tokens, true, variableMap);
ParserUtil.checkType(tokens.consume(), Token.Type.GROUP_END);
ParserUtil.checkType(tokens.consume(), Token.Type.BLOCK_BEGIN);
return new ForKeyword(parseBlock(tokens, variableMap), initializer, (Returnable<Boolean>) conditional, incrementer, identifier.getPosition());
switch(identifier.getType()) {
case FOR_LOOP:
return parseForLoop(tokens, variableMap, identifier.getPosition());
case IF_STATEMENT:
return parseIfStatement(tokens, variableMap, identifier.getPosition());
case WHILE_LOOP:
return parseWhileLoop(tokens, variableMap, identifier.getPosition());
default:
throw new UnsupportedOperationException("Unknown keyword " + identifier.getContent() + ": " + identifier.getPosition());
}
}
private WhileKeyword parseWhileLoop(TokenHolder tokens, Map<String, Variable<?>> variableMap, Position start) throws ParseException {
Returnable<?> first = parseExpression(tokens, true, variableMap);
ParserUtil.checkReturnType(first, Returnable.ReturnType.BOOLEAN);
ParserUtil.checkType(tokens.consume(), Token.Type.GROUP_END);
ParserUtil.checkType(tokens.consume(), Token.Type.BLOCK_BEGIN);
if(identifier.getType().equals(Token.Type.IF_STATEMENT))
return new IfKeyword(parseBlock(tokens, variableMap), (Returnable<Boolean>) first, identifier.getPosition()); // If statement
else if(identifier.getType().equals(Token.Type.WHILE_LOOP))
return new WhileKeyword(parseBlock(tokens, variableMap), (Returnable<Boolean>) first, identifier.getPosition()); // While loop
else throw new UnsupportedOperationException("Unknown keyword " + identifier.getContent() + ": " + identifier.getPosition());
return new WhileKeyword(parseStatementBlock(tokens, variableMap), (Returnable<Boolean>) first, start); // While loop
}
private IfKeyword parseIfStatement(TokenHolder tokens, Map<String, Variable<?>> variableMap, Position start) throws ParseException {
Returnable<?> condition = parseExpression(tokens, true, variableMap);
ParserUtil.checkReturnType(condition, Returnable.ReturnType.BOOLEAN);
ParserUtil.checkType(tokens.consume(), Token.Type.GROUP_END);
Block elseBlock = null;
Block statement = parseStatementBlock(tokens, variableMap);
List<IfKeyword.Pair<Returnable<Boolean>, Block>> elseIf = new GlueList<>();
System.out.println(tokens.get());
while(tokens.get().getType().equals(Token.Type.ELSE)) {
tokens.consume(); // Consume else.
System.out.println("int: " + tokens.get());
if(tokens.get().getType().equals(Token.Type.IF_STATEMENT)) {
System.out.println("else if");
tokens.consume(); // Consume if.
Returnable<?> elseCondition = parseExpression(tokens, true, variableMap);
ParserUtil.checkReturnType(elseCondition, Returnable.ReturnType.BOOLEAN);
elseIf.add(new IfKeyword.Pair<>((Returnable<Boolean>) elseCondition, parseStatementBlock(tokens, variableMap)));
} else {
elseBlock = parseStatementBlock(tokens, variableMap);
break; // Else must be last.
}
}
return new IfKeyword(statement, (Returnable<Boolean>) condition, elseIf, elseBlock, start); // If statement
}
private Block parseStatementBlock(TokenHolder tokens, Map<String, Variable<?>> variableMap) throws ParseException {
ParserUtil.checkType(tokens.consume(), Token.Type.BLOCK_BEGIN);
Block block = parseBlock(tokens, variableMap);
ParserUtil.checkType(tokens.consume(), Token.Type.BLOCK_END);
return block;
}
private ForKeyword parseForLoop(TokenHolder tokens, Map<String, Variable<?>> variableMap, Position start) throws ParseException {
Token f = tokens.get();
ParserUtil.checkType(f, Token.Type.NUMBER_VARIABLE, Token.Type.STRING_VARIABLE, Token.Type.BOOLEAN_VARIABLE, Token.Type.IDENTIFIER);
Item<?> initializer;
if(f.isVariableDeclaration()) {
Variable<?> forVar = parseVariableDeclaration(tokens, ParserUtil.getVariableReturnType(f));
ParserUtil.checkType(tokens.consume(), Token.Type.STRING_VARIABLE, Token.Type.BOOLEAN_VARIABLE, Token.Type.NUMBER_VARIABLE);
Token name = tokens.get();
if(functions.containsKey(name.getContent()) || variableMap.containsKey(name.getContent()) || builtinFunctions.contains(name.getContent()))
throw new ParseException(name.getContent() + " is already defined in this scope", name.getPosition());
initializer = parseAssignment(forVar, tokens, variableMap);
variableMap.put(name.getContent(), forVar);
} else initializer = parseExpression(tokens, true, variableMap);
ParserUtil.checkType(tokens.consume(), Token.Type.STATEMENT_END);
Returnable<?> conditional = parseExpression(tokens, true, variableMap);
ParserUtil.checkReturnType(conditional, Returnable.ReturnType.BOOLEAN);
ParserUtil.checkType(tokens.consume(), Token.Type.STATEMENT_END);
Item<?> incrementer;
Token token = tokens.get();
if(variableMap.containsKey(token.getContent())) { // Assume variable assignment
Variable<?> variable = variableMap.get(token.getContent());
incrementer = parseAssignment(variable, tokens, variableMap);
} else incrementer = parseFunction(tokens, true, variableMap);
ParserUtil.checkType(tokens.consume(), Token.Type.GROUP_END);
ParserUtil.checkType(tokens.consume(), Token.Type.BLOCK_BEGIN);
Block block = parseBlock(tokens, variableMap);
ParserUtil.checkType(tokens.consume(), Token.Type.BLOCK_END);
return new ForKeyword(block, initializer, (Returnable<Boolean>) conditional, incrementer, start);
}
@SuppressWarnings("unchecked")
private Returnable<?> parseExpression(TokenHolder tokens, boolean full, Map<String, Variable<?>> variableMap) throws ParseException {
boolean booleanInverted = false; // Check for boolean not operator
if(tokens.get().getType().equals(Token.Type.BOOLEAN_NOT)) {
@@ -244,7 +288,6 @@ public class Parser {
return assemble(left, right, binaryOperator);
}
@SuppressWarnings("unchecked")
private BinaryOperation<?, ?> assemble(Returnable<?> left, Returnable<?> right, Token binaryOperator) throws ParseException {
if(binaryOperator.isStrictNumericOperator())
ParserUtil.checkArithmeticOperation(left, right, binaryOperator); // Numeric type checking
@@ -311,6 +354,7 @@ public class Parser {
if(token.isLoopLike()) { // Parse loop-like tokens (if, while, etc)
parsedItems.add(parseLoopLike(tokens, parsedVariables));
continue; // No statement end
} else if(token.isIdentifier()) { // Parse identifiers
if(parsedVariables.containsKey(token.getContent())) { // Assume variable assignment
Variable<?> variable = parsedVariables.get(token.getContent());
@@ -336,12 +380,11 @@ public class Parser {
else if(token.getType().equals(Token.Type.FAIL)) parsedItems.add(new FailKeyword(tokens.consume().getPosition()));
else throw new UnsupportedOperationException("Unexpected token " + token.getType() + ": " + token.getPosition());
if(tokens.hasNext()) ParserUtil.checkType(tokens.consume(), Token.Type.STATEMENT_END, Token.Type.BLOCK_END);
if(tokens.hasNext()) ParserUtil.checkType(tokens.consume(), Token.Type.STATEMENT_END);
}
return new Block(parsedItems, first.getPosition());
}
@SuppressWarnings("unchecked")
private Assignment<?> parseAssignment(Variable<?> variable, TokenHolder tokens, Map<String, Variable<?>> variableMap) throws ParseException {
Token name = tokens.get();
@@ -356,7 +399,6 @@ public class Parser {
return new Assignment<>((Variable<Object>) variable, (Returnable<Object>) expression, name.getPosition());
}
@SuppressWarnings("unchecked")
private Function<?> parseFunction(TokenHolder tokens, boolean fullStatement, Map<String, Variable<?>> variableMap) throws ParseException {
Token identifier = tokens.consume();
ParserUtil.checkType(identifier, Token.Type.IDENTIFIER); // First token must be identifier

35
common/src/main/java/com/dfsek/terra/api/structures/parser/lang/keywords/looplike/IfKeyword.java
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@@ -6,26 +6,41 @@ import com.dfsek.terra.api.structures.parser.lang.Returnable;
import com.dfsek.terra.api.structures.structure.Rotation;
import com.dfsek.terra.api.structures.structure.buffer.Buffer;
import com.dfsek.terra.api.structures.tokenizer.Position;
import org.jetbrains.annotations.Nullable;
import java.util.List;
import java.util.Random;
public class IfKeyword implements Keyword<Block.ReturnLevel> {
private final Block conditional;
private final Returnable<Boolean> statement;
private final Position position;
private final List<Pair<Returnable<Boolean>, Block>> elseIf;
private final Block elseBlock;
public IfKeyword(Block conditional, Returnable<Boolean> statement, Position position) {
public IfKeyword(Block conditional, Returnable<Boolean> statement, List<Pair<Returnable<Boolean>, Block>> elseIf, @Nullable Block elseBlock, Position position) {
this.conditional = conditional;
this.statement = statement;
this.position = position;
this.elseIf = elseIf;
this.elseBlock = elseBlock;
}
@Override
public Block.ReturnLevel apply(Buffer buffer, Rotation rotation, Random random, int recursions) {
if(statement.apply(buffer, rotation, random, recursions)) return conditional.apply(buffer, rotation, random, recursions);
else {
for(Pair<Returnable<Boolean>, Block> pair : elseIf) {
if(pair.getLeft().apply(buffer, rotation, random, recursions)) {
return pair.getRight().apply(buffer, rotation, random, recursions);
}
}
if(elseBlock != null) return elseBlock.apply(buffer, rotation, random, recursions);
}
return Block.ReturnLevel.NONE;
}
@Override
public Position getPosition() {
return position;
@@ -35,4 +50,22 @@ public class IfKeyword implements Keyword<Block.ReturnLevel> {
public ReturnType returnType() {
return ReturnType.VOID;
}
public static class Pair<L, R> {
private final L left;
private final R right;
public Pair(L left, R right) {
this.left = left;
this.right = right;
}
public L getLeft() {
return left;
}
public R getRight() {
return right;
}
}
}

6
common/src/main/java/com/dfsek/terra/api/structures/tokenizer/Token.java
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@@ -219,6 +219,10 @@ public class Token {
/**
* For loop initializer token
*/
FOR_LOOP
FOR_LOOP,
/**
* Else keyword
*/
ELSE
}
}

2
common/src/main/java/com/dfsek/terra/api/structures/tokenizer/Tokenizer.java
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@@ -131,6 +131,8 @@ public class Tokenizer {
if(tokenString.equals("if"))
return new Token(tokenString, Token.Type.IF_STATEMENT, new Position(reader.getLine(), reader.getIndex()));
if(tokenString.equals("else"))
return new Token(tokenString, Token.Type.ELSE, new Position(reader.getLine(), reader.getIndex()));
if(tokenString.equals("while"))
return new Token(tokenString, Token.Type.WHILE_LOOP, new Position(reader.getLine(), reader.getIndex()));
if(tokenString.equals("for"))