christoph/lecture-compilers
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adapt implementation to use grammar wrapper

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Christoph
2020-12-04 13:22:54 +01:00
parent 1ae77b2e51
commit 1b0dd064d7
5 changed files with 106 additions and 67 deletions
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32
src/main/java/parser/LL1ParsingTable.java
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@ -1,5 +1,8 @@
package parser;
import parser.grammar.Grammar;
import parser.grammar.LL1GrammarAnalyzer;
import java.util.AbstractMap.SimpleEntry;
import java.util.Map;
import java.util.Map.Entry;
@ -7,24 +10,19 @@ import java.util.Set;
public class LL1ParsingTable implements ILL1ParsingTable {
private final String start;
private final Set<String> terminals;
private final Set<String> nonterminals;
private final String epsilon;
private final Grammar grammar;
private final Map<Entry<String, String>, String> parsetable;
public LL1ParsingTable(Set<String> nonterminals,
Set<String> terminals,
String start,
String epsilon,
Map<Entry<String, String>, String> parsetable) {
this.start = start;
this.terminals = terminals;
this.nonterminals = nonterminals;
this.epsilon = epsilon;
public LL1ParsingTable(Grammar grammar, Map<Entry<String, String>, String> parsetable) {
this.grammar = grammar;
this.parsetable = parsetable;
}
public static ILL1ParsingTable fromGrammar(Grammar grammar) {
LL1GrammarAnalyzer analyzer = new LL1GrammarAnalyzer(grammar);
return analyzer.getTable();
}
@Override
public String get(String nonterminal, String terminal) {
return this.parsetable.get(new SimpleEntry<>(nonterminal, terminal));
@ -32,21 +30,21 @@ public class LL1ParsingTable implements ILL1ParsingTable {
@Override
public String getStartSymbol() {
return this.start;
return this.grammar.getStartSymbol();
}
@Override
public Set<String> getNonterminals() {
return this.nonterminals;
return this.grammar.getNonterminals();
}
@Override
public Set<String> getTerminals() {
return this.terminals;
return this.grammar.getTerminals();
}
@Override
public String getEpsilon() {
return this.epsilon;
return this.grammar.getEpsilonSymbol();
}
}