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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
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 * (a) the Software, and
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package com.oracle.truffle.regex.tregex.nfa;

import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.regex.tregex.automaton.AbstractTransition;
import com.oracle.truffle.regex.tregex.parser.ast.GroupBoundaries;
import com.oracle.truffle.regex.tregex.parser.ast.PositionAssertion;
import com.oracle.truffle.regex.tregex.parser.ast.RegexAST;
import com.oracle.truffle.regex.tregex.util.json.Json;
import com.oracle.truffle.regex.tregex.util.json.JsonValue;

/**
 * Represents a transition of a {@link PureNFA}.
 */
public final class PureNFATransition implements AbstractTransition {

    private final int id;
    private final PureNFAState source;
    private final PureNFAState target;
    private final GroupBoundaries groupBoundaries;
    private final boolean caretGuard;
    private final boolean dollarGuard;
    @CompilationFinal(dimensions = 1) private final QuantifierGuard[] quantifierGuards;

    public PureNFATransition(int id, PureNFAState source, PureNFAState target, GroupBoundaries groupBoundaries, boolean caretGuard, boolean dollarGuard, QuantifierGuard[] quantifierGuards) {
        this.id = id;
        this.source = source;
        this.target = target;
        this.caretGuard = caretGuard;
        this.groupBoundaries = groupBoundaries;
        this.dollarGuard = dollarGuard;
        this.quantifierGuards = quantifierGuards;
    }

    @Override
    public int getId() {
        return id;
    }

    @Override
    public PureNFAState getSource() {
        return source;
    }

    @Override
    public PureNFAState getTarget() {
        return target;
    }

    /**
     * Capture group boundaries traversed by this transition.
     */
    public GroupBoundaries getGroupBoundaries() {
        return groupBoundaries;
    }

    /**
     * Transition is guarded by the "^" - {@link PositionAssertion}.
     */
    public boolean hasCaretGuard() {
        return caretGuard;
    }

    /**
     * Transition is guarded by the "$" - {@link PositionAssertion}.
     */
    public boolean hasDollarGuard() {
        return dollarGuard;
    }

    public QuantifierGuard[] getQuantifierGuards() {
        return quantifierGuards;
    }

    public boolean hasAnyGuards() {
        return caretGuard || dollarGuard || quantifierGuards.length > 0;
    }

    @TruffleBoundary
    public JsonValue toJson(RegexAST ast) {
        return Json.obj(Json.prop("id", id),
                        Json.prop("source", source.getId()),
                        Json.prop("target", target.getId()),
                        Json.prop("groupBoundaries", groupBoundaries),
                        Json.prop("sourceSections", groupBoundaries.indexUpdateSourceSectionsToJson(ast)));
    }
}