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372 lines
15 KiB
C#
372 lines
15 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections;
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using System.Collections.Generic;
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/**
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* @brief Collection of variable/function/method definitions
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*/
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namespace OpenSim.Region.ScriptEngine.XMREngine
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{
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public class VarDict : IEnumerable {
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public VarDict outerVarDict; // next outer VarDict to search
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public TokenDeclSDTypeClass thisClass; // this VarDict is for members of thisClass
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private struct ArgTypes {
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public TokenType[] argTypes;
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public bool CanBeCalledBy (TokenType[] calledBy)
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{
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if ((argTypes == null) && (calledBy == null)) return true;
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if ((argTypes == null) || (calledBy == null)) return false;
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if (argTypes.Length != calledBy.Length) return false;
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for (int i = argTypes.Length; -- i >= 0;) {
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if (!TypeCast.IsAssignableFrom (argTypes[i], calledBy[i])) return false;
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}
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return true;
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}
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public override bool Equals (Object that)
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{
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if (that == null) return false;
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if (that.GetType () != typeof (ArgTypes)) return false;
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TokenType[] at = this.argTypes;
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TokenType[] bt = ((ArgTypes)that).argTypes;
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if ((at == null) && (bt == null)) return true;
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if ((at == null) || (bt == null)) return false;
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if (at.Length != bt.Length) return false;
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for (int i = at.Length; -- i >= 0;) {
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if (at[i].ToString () != bt[i].ToString ()) return false;
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}
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return true;
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}
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public override int GetHashCode ()
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{
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TokenType[] at = this.argTypes;
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if (at == null) return -1;
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int hc = 0;
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for (int i = at.Length; -- i >= 0;) {
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int c = (hc < 0) ? 1 : 0;
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hc = hc * 2 + c;
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hc ^= at[i].ToString ().GetHashCode ();
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}
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return hc;
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}
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}
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private struct TDVEntry {
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public int count;
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public TokenDeclVar var;
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}
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private bool isFrozen = false;
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private bool locals;
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private Dictionary<string, Dictionary<ArgTypes, TDVEntry>> master = new Dictionary<string, Dictionary<ArgTypes, TDVEntry>> ();
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private int count = 0;
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private VarDict frozenLocals = null;
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/**
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* @brief Constructor.
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* @param locals = false: cannot be frozen, allows forward references
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* true: can be frozen, thus forbidding forward references
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*/
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public VarDict (bool locals)
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{
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this.locals = locals;
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}
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/**
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* @brief Add new variable to the dictionary.
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*/
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public bool AddEntry (TokenDeclVar var)
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{
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if (isFrozen) {
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throw new Exception ("var dict is frozen");
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}
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/*
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* Make sure we have a sub-dictionary based on the bare name (ie, no signature)
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*/
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Dictionary<ArgTypes, TDVEntry> typedic;
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if (!master.TryGetValue (var.name.val, out typedic)) {
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typedic = new Dictionary<ArgTypes, TDVEntry> ();
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master.Add (var.name.val, typedic);
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}
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/*
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* See if there is an entry in the sub-dictionary that matches the argument signature.
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* Note that fields have null argument lists.
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* Methods always have a non-null argument list, even if only 0 entries long.
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*/
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ArgTypes types;
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types.argTypes = (var.argDecl == null) ? null : KeyTypesToStringTypes (var.argDecl.types);
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if (typedic.ContainsKey (types)) return false;
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/*
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* It is unique, add to its name-specific sub-dictionary.
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*/
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TDVEntry entry;
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entry.count = ++ count;
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entry.var = var;
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typedic.Add (types, entry);
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return true;
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}
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public int Count { get { return count; } }
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/**
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* @brief If this is not a local variable frame, just return the frame as is.
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* If this is a local variable frame, return a version that is frozen,
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* ie, one that does not contain any future additions.
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*/
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public VarDict FreezeLocals ()
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{
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/*
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* If not local var frame, return original frame as is.
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* This will allow forward references as the future additions
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* will be seen by lookups done in this dictionary.
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*/
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if (!locals) return this;
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/*
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* If local var frame, return a copy frozen at this point.
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* This disallows forward referenes as those future additions
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* will not be seen by lookups done in the frozen dictionary.
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*/
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if ((frozenLocals == null) || (frozenLocals.count != this.count)) {
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/*
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* Make a copy of the current var dictionary frame.
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* We copy a reference to the dictionary, and though it may
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* contain additions made after this point, those additions
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* will have a count .gt. frozen count and will be ignored.
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*/
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frozenLocals = new VarDict (true);
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frozenLocals.outerVarDict = this.outerVarDict;
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frozenLocals.thisClass = this.thisClass;
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frozenLocals.master = this.master;
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frozenLocals.count = this.count;
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frozenLocals.frozenLocals = frozenLocals;
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/*
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* Mark it as being frozen.
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* - assert fail if any attempt is made to add to it
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* - ignore any additions to the dictionary with greater count
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*/
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frozenLocals.isFrozen = true;
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}
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return frozenLocals;
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}
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/**
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* @brief Find all functions/variables that are callable
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* @param name = name of function/variable to look for
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* @param argTypes = the argument types the function is being called with
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* null to look for a variable
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* @returns null: no matching function/variable found
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* else: list of matching functions/variables
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* for variables, always of length 1
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*/
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private List<TokenDeclVar> found = new List<TokenDeclVar> ();
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public TokenDeclVar[] FindCallables (string name, TokenType[] argTypes)
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{
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argTypes = KeyTypesToStringTypes (argTypes);
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TokenDeclVar var = FindExact (name, argTypes);
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if (var != null) return new TokenDeclVar[] { var };
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Dictionary<ArgTypes, TDVEntry> typedic;
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if (!master.TryGetValue (name, out typedic)) return null;
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found.Clear ();
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foreach (KeyValuePair<ArgTypes, TDVEntry> kvp in typedic) {
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if ((kvp.Value.count <= this.count) && kvp.Key.CanBeCalledBy (argTypes)) {
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found.Add (kvp.Value.var);
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}
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}
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return (found.Count > 0) ? found.ToArray () : null;
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}
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/**
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* @brief Find exact matching function/variable
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* @param name = name of function to look for
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* @param argTypes = argument types the function was declared with
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* null to look for a variable
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* @returns null: no matching function/variable found
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* else: the matching function/variable
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*/
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public TokenDeclVar FindExact (string name, TokenType[] argTypes)
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{
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/*
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* Look for list of stuff that matches the given name.
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*/
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Dictionary<ArgTypes, TDVEntry> typedic;
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if (!master.TryGetValue (name, out typedic)) return null;
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/*
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* Loop through all fields/methods declared by that name, regardless of arg signature.
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*/
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foreach (TDVEntry entry in typedic.Values) {
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if (entry.count > this.count) continue;
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TokenDeclVar var = entry.var;
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/*
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* Get argument types of declaration.
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* fields are always null
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* methods are always non-null, though may be zero-length
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*/
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TokenType[] declArgs = (var.argDecl == null) ? null : var.argDecl.types;
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/*
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* Convert any key args to string args.
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*/
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declArgs = KeyTypesToStringTypes (declArgs);
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/*
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* If both are null, they are signature-less (ie, both are fields), and so match.
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*/
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if ((declArgs == null) && (argTypes == null)) return var;
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/*
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* If calling a delegate, it is a match, regardless of delegate arg types.
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* If it turns out the arg types do not match, the compiler will give an error
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* trying to cast the arguments to the delegate arg types.
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* We don't allow overloading same field name with different delegate types.
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*/
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if ((declArgs == null) && (argTypes != null)) {
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TokenType fieldType = var.type;
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if (fieldType is TokenTypeSDTypeDelegate) return var;
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}
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/*
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* If not both null, no match, keep looking.
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*/
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if ((declArgs == null) || (argTypes == null)) continue;
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/*
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* Both not null, match argument types to make sure we have correct overload.
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*/
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int i = declArgs.Length;
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if (i != argTypes.Length) continue;
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while (-- i >= 0) {
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string da = declArgs[i].ToString ();
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string ga = argTypes[i].ToString ();
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if (da == "key") da = "string";
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if (ga == "key") ga = "string";
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if (da != ga) break;
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}
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if (i < 0) return var;
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}
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/*
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* No match.
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*/
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return null;
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}
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/**
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* @brief Replace any TokenTypeKey elements with TokenTypeStr so that
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* it doesn't matter if functions are declared with key or string,
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* they will accept either.
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* @param argTypes = argument types as declared in source code
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* @returns argTypes with any key replaced by string
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*/
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private static TokenType[] KeyTypesToStringTypes (TokenType[] argTypes)
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{
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if (argTypes != null) {
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int i;
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int nats = argTypes.Length;
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for (i = nats; -- i >= 0;) {
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if (argTypes[i] is TokenTypeKey) break;
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}
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if (i >= 0) {
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TokenType[] at = new TokenType[nats];
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for (i = nats; -- i >= 0;) {
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at[i] = argTypes[i];
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if (argTypes[i] is TokenTypeKey) {
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at[i] = new TokenTypeStr (argTypes[i]);
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}
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}
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return at;
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}
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}
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return argTypes;
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}
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// foreach goes through all the TokenDeclVars that were added
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// IEnumerable
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public IEnumerator GetEnumerator ()
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{
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return new VarDictEnumerator (this.master, this.count);
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}
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private class VarDictEnumerator : IEnumerator {
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private IEnumerator masterEnum;
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private IEnumerator typedicEnum;
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private int count;
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public VarDictEnumerator (Dictionary<string, Dictionary<ArgTypes, TDVEntry>> master, int count)
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{
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masterEnum = master.Values.GetEnumerator ();
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this.count = count;
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}
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// IEnumerator
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public void Reset ()
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{
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masterEnum.Reset ();
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typedicEnum = null;
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}
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// IEnumerator
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public bool MoveNext ()
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{
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while (true) {
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if (typedicEnum != null) {
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while (typedicEnum.MoveNext ()) {
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if (((TDVEntry)typedicEnum.Current).count <= this.count) return true;
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}
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typedicEnum = null;
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}
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if (!masterEnum.MoveNext ()) return false;
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Dictionary<ArgTypes, TDVEntry> ctd;
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ctd = (Dictionary<ArgTypes, TDVEntry>)masterEnum.Current;
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typedicEnum = ctd.Values.GetEnumerator ();
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}
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}
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// IEnumerator
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public object Current { get { return ((TDVEntry)typedicEnum.Current).var; } }
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}
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}
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}
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