155 lines
9.4 KiB
C#
155 lines
9.4 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="StateMachine.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">Microsoft</owner>
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//------------------------------------------------------------------------------
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namespace System.Xml.Xsl.XsltOld {
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using Res = System.Xml.Utils.Res;
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using System;
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using System.Diagnostics;
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using System.Xml;
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using System.Xml.XPath;
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internal class StateMachine {
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// Constants for the state table
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private const int Init = 0x000000; // Initial state
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private const int Elem = 0x000001; // Element was output
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private const int NsN = 0x000002; // Namespace name was output
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private const int NsV = 0x000003; // Namespace value was output (some more can follow)
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private const int Ns = 0x000004; // Namespace was output
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private const int AttrN = 0x000005; // Attribute name was output
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private const int AttrV = 0x000006; // Attribute value was output (some more can follow)
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private const int Attr = 0x000007; // Attribute was output
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private const int InElm = 0x000008; // Filling in element, general state text
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private const int EndEm = 0x000009; // After end element event - next end element doesn't generate token
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private const int InCmt = 0x00000a; // Adding text to a comment
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private const int InPI = 0x00000b; // Adding text to a processing instruction
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private const int StateMask = 0x00000F; // State mask
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internal const int Error = 0x000010; // Invalid XML state
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private const int Ignor = 0x000020; // Ignore this transition
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private const int Assrt = 0x000030; // Assrt
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private const int U = 0x000100; // Depth up
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private const int D = 0x000200; // Depth down
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internal const int DepthMask = 0x000300; // Depth mask
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internal const int DepthUp = U;
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internal const int DepthDown = D;
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private const int C = 0x000400; // BeginChild
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private const int H = 0x000800; // HadChild
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private const int M = 0x001000; // EmptyTag
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internal const int BeginChild = C;
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internal const int HadChild = H;
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internal const int EmptyTag = M;
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private const int B = 0x002000; // Begin Record
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private const int E = 0x004000; // Record finished
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internal const int BeginRecord = B;
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internal const int EndRecord = E;
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private const int S = 0x008000; // Push namespace scope
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private const int P = 0x010000; // Pop current namepsace scope
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internal const int PushScope = S;
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internal const int PopScope = P; // Next event must pop scope
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//
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// Runtime state
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//
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private int _State;
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internal StateMachine() {
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_State = Init;
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}
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internal int State {
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get {
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return _State;
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}
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set {
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// Hope you know what you are doing ...
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_State = value;
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}
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}
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internal void Reset() {
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_State = Init;
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}
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internal static int StateOnly(int state) {
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return state & StateMask;
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}
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internal int BeginOutlook(XPathNodeType nodeType) {
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int newState = s_BeginTransitions[(int)nodeType][_State];
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Debug.Assert(newState != Assrt);
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return newState;
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}
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internal int Begin(XPathNodeType nodeType) {
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int newState = s_BeginTransitions[(int)nodeType][_State];
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Debug.Assert(newState != Assrt);
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if (newState != Error && newState != Ignor) {
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_State = newState & StateMask;
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}
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return newState;
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}
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internal int EndOutlook(XPathNodeType nodeType) {
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int newState = s_EndTransitions[(int)nodeType][_State];
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Debug.Assert(newState != Assrt);
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return newState;
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}
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internal int End(XPathNodeType nodeType) {
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int newState = s_EndTransitions[(int)nodeType][_State];
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Debug.Assert(newState != Assrt);
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if (newState != Error && newState != Ignor) {
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_State = newState & StateMask;
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}
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return newState;
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}
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private static readonly int [][] s_BeginTransitions = {
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/* { Init, Elem, NsN, NsV, Ns, AttrN, AttrV, Attr, InElm, EndEm, InCmt, InPI }, */
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/* Root */ new int[] { Error, Error, Error, Error, Error, Error, Error, Error, Error, Error, Error, Error },
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/* Element */ new int[] { Elem |B|S, Elem |U|C|B|S, Error, Error, Elem |C|B|S, Error, Error, Elem |C|B|S, Elem |B|S, Elem |B|P|S, Error, Error },
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/* Attribute */ new int[] { Error, AttrN|U, Error, Error, AttrN, Error, Error, AttrN, Error, Error, Error, Error },
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/* Namespace */ new int[] { Error, NsN|U, Error, Error, NsN, Error, Error, Error, Error, Error, Error, Error },
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/* Text */ new int[] { InElm|B, InElm|U|C|B, NsV|U, NsV, InElm|C|B, AttrV|U, AttrV, InElm|C|B, InElm, InElm|B|P, InCmt, InPI },
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/* SignificantWhitespace */ new int[] { InElm|B, InElm|U|C|B, NsV|U, NsV, InElm|C|B, AttrV|U, AttrV, InElm|C|B, InElm, InElm|B|P, InCmt, InPI },
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/* Whitespace */ new int[] { InElm|B, InElm|U|C|B, NsV|U, NsV, InElm|C|B, AttrV|U, AttrV, InElm|C|B, InElm, InElm|B|P, InCmt, InPI },
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/* ProcessingInstruction */ new int[] { InPI |B, InPI |U|C|B, Error, Error, InPI |C|B, Error, Error, InPI |C|B, InPI |B, InPI |B|P, Error, Error },
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/* Comment */ new int[] { InCmt|B, InCmt|U|C|B, Error, Error, InCmt|C|B, Error, Error, InCmt|C|B, InCmt|B, InCmt|B|P, Error, Error },
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/* All */ new int[] { Error, Error, Error, Error, Error, Error, Error, Error, Error, Error, Error, Error },
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};
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private static readonly int [][] s_EndTransitions = {
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/* { Init, Elem, NsN, NsV, Ns, AttrN, AttrV, Attr, InElm, EndEm, InCmt, InPI }, */
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/* Root */ new int[] { Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt },
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/* Element */ new int[] { Assrt, EndEm|B|E|P|M, Assrt, Assrt, EndEm|D|B|E|P|M, Assrt, Assrt, EndEm|D|B|E|P|M, EndEm|D|H|B|E|P, EndEm|D|H|B|E|P, Assrt, Assrt },
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/* Attribute */ new int[] { Assrt, Assrt, Assrt, Assrt, Assrt, Attr, Attr |D, Assrt, Assrt, Assrt, Assrt, Assrt },
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/* Namespace */ new int[] { Assrt, Assrt, Ns, Ns |D, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt },
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/* Text */ new int[] { Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt },
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/* SignificantWhitespace */ new int[] { Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt },
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/* Whitespace */ new int[] { Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt },
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/* ProcessingInstruction */ new int[] { Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, EndEm|E},
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/* Comment */ new int[] { Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, EndEm|E, Assrt },
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/* All */ new int[] { Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt, Assrt },
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};
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}
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}
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