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Implement variable reassignment and while loops

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dfsek
2020-12-22 02:39:53 -07:00
parent 2ab4ed871c
commit 88da796923
4 changed files with 68 additions and 7 deletions
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22
common/src/main/java/com/dfsek/terra/api/structures/parser/Parser.java
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@@ -11,6 +11,7 @@ import com.dfsek.terra.api.structures.parser.lang.constants.StringConstant;
import com.dfsek.terra.api.structures.parser.lang.functions.Function;
import com.dfsek.terra.api.structures.parser.lang.functions.FunctionBuilder;
import com.dfsek.terra.api.structures.parser.lang.keywords.IfKeyword;
import com.dfsek.terra.api.structures.parser.lang.keywords.WhileKeyword;
import com.dfsek.terra.api.structures.parser.lang.operations.BinaryOperation;
import com.dfsek.terra.api.structures.parser.lang.operations.BooleanAndOperation;
import com.dfsek.terra.api.structures.parser.lang.operations.BooleanNotOperation;
@@ -47,7 +48,7 @@ import java.util.Set;
public class Parser {
private final String data;
private final Map<String, FunctionBuilder<? extends Function<?>>> functions = new HashMap<>();
private final Set<String> keywords = Sets.newHashSet("if", "return", "var");
private final Set<String> keywords = Sets.newHashSet("if", "return", "while");
Set<Token.Type> allowedArguments = Sets.newHashSet(Token.Type.STRING, Token.Type.NUMBER, Token.Type.IDENTIFIER);
@@ -90,7 +91,7 @@ public class Parser {
if(!keywords.contains(identifier.getContent()))
throw new ParseException("No such keyword " + identifier.getContent() + ": " + identifier.getPosition());
Keyword<?> k = null;
if(identifier.getContent().equals("if")) {
if(identifier.getContent().equals("if") || identifier.getContent().equals("while")) {
ParserUtil.checkType(tokens.remove(0), Token.Type.GROUP_BEGIN);
@@ -101,7 +102,10 @@ public class Parser {
ParserUtil.checkType(tokens.remove(0), Token.Type.BLOCK_BEGIN);
k = new IfKeyword(parseBlock(tokens, variableMap), (Returnable<Boolean>) comparator, identifier.getPosition());
if(identifier.getContent().equals("if"))
k = new IfKeyword(parseBlock(tokens, variableMap), (Returnable<Boolean>) comparator, identifier.getPosition()); // If statement
else
k = new WhileKeyword(parseBlock(tokens, variableMap), (Returnable<Boolean>) comparator, identifier.getPosition()); // While loop
}
return k;
@@ -232,6 +236,7 @@ public class Parser {
throw new UnsupportedOperationException("Unsupported variable type: " + type);
}
@SuppressWarnings("unchecked")
private Block parseBlock(List<Token> tokens, Map<String, Variable<?>> superVars) throws ParseException {
List<Item<?>> parsedItems = new GlueList<>();
@@ -251,7 +256,11 @@ public class Parser {
ParserUtil.checkType(tokens.get(0), Token.Type.IDENTIFIER, Token.Type.KEYWORD, Token.Type.BLOCK_END);
break;
case IDENTIFIER:
parsedItems.add(parseFunction(tokens, true, parsedVariables));
if(parsedVariables.containsKey(token.getContent())) {
Variable<?> variable = parsedVariables.get(token.getContent());
parsedItems.add(parseAssignment(variable, tokens, parsedVariables));
} else parsedItems.add(parseFunction(tokens, true, parsedVariables));
if(tokens.isEmpty()) break;
ParserUtil.checkType(tokens.remove(0), Token.Type.STATEMENT_END, Token.Type.BLOCK_END);
break;
@@ -272,6 +281,9 @@ public class Parser {
throw new ParseException(name.getContent() + " is already defined in this scope: " + name.getPosition());
parsedVariables.put(name.getContent(), temp);
ParserUtil.checkType(tokens.remove(0), Token.Type.STRING_VARIABLE, Token.Type.BOOLEAN_VARIABLE, Token.Type.NUMBER_VARIABLE);
parsedItems.add(parseAssignment(temp, tokens, parsedVariables));
ParserUtil.checkType(tokens.remove(0), Token.Type.STATEMENT_END);
break;
@@ -285,8 +297,6 @@ public class Parser {
@SuppressWarnings("unchecked")
private Assignment<?> parseAssignment(Variable<?> variable, List<Token> tokens, Map<String, Variable<?>> variableMap) throws ParseException {
ParserUtil.checkType(tokens.remove(0), Token.Type.STRING_VARIABLE, Token.Type.BOOLEAN_VARIABLE, Token.Type.NUMBER_VARIABLE);
Token name = tokens.get(0);
ParserUtil.checkType(tokens.remove(0), Token.Type.IDENTIFIER);

42
common/src/main/java/com/dfsek/terra/api/structures/parser/lang/keywords/WhileKeyword.java Normal file
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@@ -0,0 +1,42 @@
package com.dfsek.terra.api.structures.parser.lang.keywords;
import com.dfsek.terra.api.math.vector.Location;
import com.dfsek.terra.api.platform.world.Chunk;
import com.dfsek.terra.api.structures.parser.lang.Block;
import com.dfsek.terra.api.structures.parser.lang.Keyword;
import com.dfsek.terra.api.structures.parser.lang.Returnable;
import com.dfsek.terra.api.structures.tokenizer.Position;
public class WhileKeyword implements Keyword<Void> {
private final Block conditional;
private final Returnable<Boolean> statement;
private final Position position;
public WhileKeyword(Block conditional, Returnable<Boolean> statement, Position position) {
this.conditional = conditional;
this.statement = statement;
this.position = position;
}
@Override
public Void apply(Location location) {
while(statement.apply(location)) conditional.apply(location);
return null;
}
@Override
public Void apply(Location location, Chunk chunk) {
while(statement.apply(location, chunk)) conditional.apply(location, chunk);
return null;
}
@Override
public Position getPosition() {
return position;
}
@Override
public ReturnType returnType() {
return ReturnType.VOID;
}
}

2
common/src/main/java/com/dfsek/terra/api/structures/tokenizer/Tokenizer.java
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@@ -12,7 +12,7 @@ public class Tokenizer {
private final Lookahead reader;
private final Set<Character> syntaxSignificant = Sets.newHashSet(';', '(', ')', '"', ',', '\\', '=', '{', '}', '+', '-', '*', '/', '>', '<', '!'); // Reserved chars
private final Set<String> keywords = Sets.newHashSet("if", "return", "num", "bool", "str");
private final Set<String> keywords = Sets.newHashSet("if", "while", "num", "bool", "str");
public Tokenizer(String data) {