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Code Issues Releases Wiki Activity

Implement parsing functions.

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This commit is contained in:
Danila Fedorin 2017-07-26 18:44:17 -07:00
parent 12e34230ec
commit e8d9836431
3 changed files with 78 additions and 6 deletions
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47
src/org/nwapw/abacus/tree/FunctionNode.java Normal file
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@ -0,0 +1,47 @@
package org.nwapw.abacus.tree;
import java.util.ArrayList;
public class FunctionNode extends TreeNode {
private String function;
private ArrayList<TreeNode> children;
private FunctionNode() { }
public FunctionNode(String function){
this.function = function;
children = new ArrayList<>();
}
public String getFunction() {
return function;
}
public void addChild(TreeNode node){
children.add(node);
}
@Override
public <T> T reduce(Reducer<T> reducer) {
Object[] reducedChildren = new Object[children.size()];
for(int i = 0; i < reducedChildren.length; i++){
reducedChildren[i] = children.get(i).reduce(reducer);
if(reducedChildren[i] == null) return null;
}
return reducer.reduceNode(this, reducedChildren);
}
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append(function);
buffer.append("(");
for(int i = 0; i < children.size(); i++){
buffer.append(children.get(i));
buffer.append(i == children.size() - 1 ? "" : ", ");
}
buffer.append(")");
return buffer.toString();
}
}

2
src/org/nwapw/abacus/tree/TokenType.java
View File

@ -6,7 +6,7 @@ package org.nwapw.abacus.tree;
*/
public enum TokenType {
ANY(0), OP(1), NUM(2), WORD(3), OPEN_PARENTH(4), CLOSE_PARENTH(5);
INTERNAL_FUNCTION_END(-1), INTERNAL_FUNCTION_START(-1), ANY(0), COMMA(1), OP(2), NUM(3), WORD(4), OPEN_PARENTH(5), CLOSE_PARENTH(6);
/**
* The priority by which this token gets sorted.

35
src/org/nwapw/abacus/tree/TreeNode.java
View File

@ -14,6 +14,7 @@ public abstract class TreeNode {
* The lexer used to lex tokens.
*/
protected static Lexer<TokenType> lexer = new Lexer<TokenType>(){{
register(",", TokenType.COMMA);
register("\\+|-|\\*|/|^", TokenType.OP);
register("[0-9]+(\\.[0-9]+)?", TokenType.NUM);
register("[a-zA-Z]+", TokenType.WORD);
@ -67,9 +68,10 @@ public abstract class TreeNode {
Stack<Match<TokenType>> tokenStack = new Stack<>();
while(!from.isEmpty()){
Match<TokenType> match = from.remove(0);
if(match.getType() == TokenType.NUM) {
TokenType matchType = match.getType();
if(matchType == TokenType.NUM || matchType == TokenType.WORD) {
output.add(match);
} else if(match.getType() == TokenType.OP){
} else if(matchType == TokenType.OP){
String tokenString = source.substring(match.getFrom(), match.getTo());
int precedence = precedenceMap.get(tokenString);
OperatorAssociativity associativity = associativityMap.get(tokenString);
@ -86,14 +88,24 @@ public abstract class TreeNode {
output.add(tokenStack.pop());
}
tokenStack.push(match);
} else if(match.getType() == TokenType.OPEN_PARENTH){
} else if(matchType == TokenType.OPEN_PARENTH){
if(!output.isEmpty() && output.get(output.size() - 1).getType() == TokenType.WORD){
tokenStack.push(output.remove(output.size() - 1));
output.add(new Match<>(0, 0, TokenType.INTERNAL_FUNCTION_END));
}
tokenStack.push(match);
} else if(match.getType() == TokenType.CLOSE_PARENTH){
} else if(matchType == TokenType.CLOSE_PARENTH || matchType == TokenType.COMMA){
while(!tokenStack.empty() && tokenStack.peek().getType() != TokenType.OPEN_PARENTH){
output.add(tokenStack.pop());
}
if(tokenStack.empty()) return null;
tokenStack.pop();
if(matchType == TokenType.CLOSE_PARENTH){
tokenStack.pop();
if(!tokenStack.empty() && tokenStack.peek().getType() == TokenType.WORD) {
output.add(tokenStack.pop());
output.add(new Match<>(0, 0, TokenType.INTERNAL_FUNCTION_START));
}
}
}
}
while(!tokenStack.empty()){
@ -119,6 +131,19 @@ public abstract class TreeNode {
else return new OpNode(source.substring(match.getFrom(), match.getTo()), left, right);
} else if(match.getType() == TokenType.NUM){
return new NumberNode(Double.parseDouble(source.substring(match.getFrom(), match.getTo())));
} else if(match.getType() == TokenType.INTERNAL_FUNCTION_START){
if(matches.isEmpty() || matches.get(0).getType() != TokenType.WORD) return null;
Match<TokenType> stringName = matches.remove(0);
String functionName = source.substring(stringName.getFrom(), stringName.getTo());
FunctionNode node = new FunctionNode(functionName);
while(!matches.isEmpty() && matches.get(0).getType() != TokenType.INTERNAL_FUNCTION_END){
TreeNode argument = fromStringRecursive(source, matches);
if(argument == null) return null;
node.addChild(argument);
}
if(matches.isEmpty()) return null;
matches.remove(0);
return node;
}
return null;
}