christoph/lecture-compilers
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refactor action parsing

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ChUrl
2020-12-11 16:01:40 +01:00
parent 8a310e6c41
commit d06d535bcd
1 changed files with 17 additions and 36 deletions
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53
src/main/java/parser/grammar/Grammar.java
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@ -5,9 +5,7 @@ import parser.Actions;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.AbstractMap.SimpleEntry;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
@ -16,6 +14,7 @@ import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import static parser.Actions.COMPACT;
import static util.tools.Logger.log;
public class Grammar {
@ -25,29 +24,19 @@ public class Grammar {
private final String startSymbol;
private final String epsilonSymbol;
private final Map<Map.Entry<String, String>, Set<String>> actions;
// Actions
private final Map<String, Set<String>> compact;
private final Set<GrammarRule> rules;
public Grammar(Set<String> terminals, Set<String> nonterminals,
String startSymbol, String epsilonSymbol,
Set<GrammarRule> rules) {
Map<String, Set<String>> compact, Set<GrammarRule> rules) {
this.terminals = terminals;
this.nonterminals = nonterminals;
this.startSymbol = startSymbol;
this.epsilonSymbol = epsilonSymbol;
this.actions = null;
this.rules = rules;
}
public Grammar(Set<String> terminals, Set<String> nonterminals,
String startSymbol, String epsilonSymbol,
Map<Map.Entry<String, String>, Set<String>> actions, Set<GrammarRule> rules) {
this.terminals = terminals;
this.nonterminals = nonterminals;
this.startSymbol = startSymbol;
this.epsilonSymbol = epsilonSymbol;
this.actions = actions;
this.compact = compact;
this.rules = rules;
}
@ -65,7 +54,7 @@ public class Grammar {
Set<String> terminals = new HashSet<>();
Set<String> nonterminals = new HashSet<>();
Map<Map.Entry<String, String>, Set<String>> actions = new HashMap<>();
Map<String, Set<String>> compact = new HashMap<>();
Set<GrammarRule> rules = new HashSet<>();
log("Parsing Grammar from File:");
@ -116,20 +105,20 @@ public class Grammar {
}
// "S[C R]" wird zu "S"
leftside = leftside.substring(0, open);
leftside = leftside.substring(0, open).trim();
}
// "E T2 | epsilon" wird zu prods[0] = "E T2" und prods[1] = "epsilon"
String[] prods = rightside.split("\\|");
compact.put(leftside, new HashSet<>());
for (String prod : prods) {
GrammarRule rule = new GrammarRule(leftside, prod.split(" "));
rules.add(rule);
actions.put(new SimpleEntry<>(leftside, prod), new HashSet<>());
actions.get(new SimpleEntry<>(leftside, prod)).addAll(flagList);
if (!flagList.isEmpty()) {
log("Registered actions: " + leftside + " -> " + prod + ": " + flagList);
if (flagList.contains(COMPACT.toString().toLowerCase())) {
compact.get(leftside).add(prod.trim());
log("Registered compact: " + leftside + " -> " + prod.trim());
}
}
@ -139,15 +128,15 @@ public class Grammar {
}
}
log("\n" + actions);
log("\n" + compact);
log("-".repeat(100));
return new Grammar(terminals, nonterminals,
startSymbol, epsilonSymbol,
rules);
compact, rules);
} catch (Exception e) {
System.out.println("Die Grammatik kann nicht gelesen werden!");
System.out.println(path);
log("Die Grammatik kann nicht gelesen werden!");
log(path.toString());
e.printStackTrace();
}
@ -187,15 +176,7 @@ public class Grammar {
.collect(Collectors.toUnmodifiableSet());
}
public Set<String> getActions(String leftside, String rightside) {
return this.actions == null ? Collections.emptySet() : this.actions.get(new SimpleEntry<>(leftside, rightside));
}
public Set<String> getAllActions(String rightside) {
return this.actions.entrySet().stream()
.filter(entry -> entry.getKey().getValue().equals(rightside))
.map(Map.Entry::getValue)
.flatMap(Collection::stream)
.collect(Collectors.toUnmodifiableSet());
public boolean hasCompact(String leftside, String rightside) {
return this.compact != null && this.compact.get(leftside).contains(rightside);
}
}