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using Implab.Automaton;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.CompilerServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace Implab.Formats {
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public class InputScanner<TTag> {
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readonly TTag[] m_tags;
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readonly int m_initialState;
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readonly int[,] m_dfa;
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readonly CharMap m_alphabet;
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readonly bool[] m_final;
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int m_position;
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int m_state;
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public InputScanner(int[,] dfaTable, bool[] finalStates, TTag[] tags, int initialState, CharMap alphabet) {
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Safe.ArgumentNotNull(dfaTable, nameof(dfaTable));
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Safe.ArgumentNotNull(finalStates, nameof(finalStates));
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Safe.ArgumentNotNull(tags, nameof(tags));
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Safe.ArgumentNotNull(alphabet, nameof(alphabet));
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m_dfa = dfaTable;
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m_final = finalStates;
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m_tags = tags;
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m_initialState = initialState;
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m_alphabet = alphabet;
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}
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public TTag Tag {
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get {
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return m_tags[m_state];
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}
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}
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public int Position {
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get {
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return m_position;
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}
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}
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public bool IsFinal {
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get {
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return m_final[m_state];
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public void ResetState() {
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m_state = m_initialState;
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}
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public InputScanner<TTag> Clone() {
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var clone = new InputScanner<TTag>(m_dfa, m_final, m_tags, m_initialState, m_alphabet);
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clone.m_state = m_state;
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clone.m_position = m_position;
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return clone;
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}
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//[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public bool Scan(char[] data, int offset, int max) {
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var next = m_state;
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while(offset < max) {
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next = m_dfa[next, m_alphabet.Translate(data[offset])];
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if (next == AutomatonConst.UnreachableState) {
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// scanner stops on the next position after last recognized symbol
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m_position = offset;
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return false;
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}
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m_state = next;
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offset++;
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}
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m_position = offset;
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return true;
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}
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}
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}
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