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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Text.RegularExpressions;
namespace Microsoft.Boogie
{
abstract internal class ModelParser
{
protected Model currModel;
int lineNo;
internal List<Model> resModels = new List<Model> ();
internal System.IO.TextReader rd;
string lastLine = "";
protected static char[] seps = new char[] { ' ' };
protected static Regex bitVec = new Regex (@"\(_ BitVec (\d+)\)");
protected static Regex bv = new Regex (@"\(_ bv(\d+) (\d+)\)");
protected void NewModel ()
{
lastLine = "";
currModel = new Model ();
resModels.Add (currModel);
}
protected void BadModel (string msg)
{
throw new ArgumentException (string.Format ("Invalid model: {0}, at line {1} ({2})", msg, lineNo, lastLine));
}
protected string ReadLine ()
{
var l = rd.ReadLine ();
if (l != null) {
lineNo++;
lastLine = l;
}
return l;
}
string[] GetWords (string line)
{
if (line == null)
return null;
var words = line.Split (seps, StringSplitOptions.RemoveEmptyEntries);
return words;
}
Model.Element GetElt (string name)
{
Model.Element ret = currModel.TryMkElement (name);
if (ret == null)
BadModel ("invalid element name " + name);
return ret;
}
protected Model.Element GetElt (object o)
{
string s = o as string;
if (s != null)
return GetElt (s);
List<object> os = (List<object>)o;
if (!(os[0] is string))
os.Insert(0, "_"); // KLM: fix crash on ((as const (Array Int Int)) 0)
List<Model.Element> args = new List<Model.Element> ();
for (int i = 1; i < os.Count; i++) {
args.Add (GetElt (os [i]));
}
return new Model.DatatypeValue (currModel, (string)os [0], args);
}
protected int CountOpenParentheses (string s, int n)
{
int f = n;
foreach (char c in s) {
if (c == '(')
f++;
else if (c == ')')
f--;
}
if (f < 0)
BadModel ("mismatched parentheses in datatype term");
return f;
}
abstract internal void Run ();
}
class ParserZ3 : ModelParser
{
List<object> GetFunctionTokens (string newLine)
{
if (newLine == null)
return null;
newLine = bitVec.Replace (newLine, "bv${1}");
newLine = bv.Replace (newLine, "bv${1}[${2}]");
string line = newLine;
int openParenCounter = CountOpenParentheses (newLine, 0);
if (!newLine.Contains ("}")) {
while (openParenCounter > 0) {
newLine = ReadLine ();
if (newLine == null) {
return null;
}
line += newLine;
openParenCounter = CountOpenParentheses (newLine, openParenCounter);
}
}
line = line.Replace ("(", " ( ");
line = line.Replace (")", " ) ");
var tuple = line.Split (seps, StringSplitOptions.RemoveEmptyEntries);
List<object> newTuple = new List<object> ();
Stack<List<object>> wordStack = new Stack<List<object>> ();
for (int i = 0; i < tuple.Length; i++) {
string elem = tuple [i];
if (elem == "(") {
List<object> ls = new List<object> ();
wordStack.Push (ls);
} else if (elem == ")") {
List<object> ls = wordStack.Pop ();
if (wordStack.Count > 0) {
wordStack.Peek ().Add (ls);
} else {
newTuple.Add (ls);
}
} else if (wordStack.Count > 0) {
wordStack.Peek ().Add (elem);
} else {
newTuple.Add (elem);
}
}
return newTuple;
}
internal override void Run ()
{
var selectFunctions = new Dictionary<int, Model.Func> ();
var storeFunctions = new Dictionary<int, Model.Func> ();
for (; ;) {
var line = ReadLine ();
if (line == null)
break; // end of model, everything fine
if (line == "Counterexample:" || line == "Error model: " || line == "*** MODEL") {
NewModel ();
continue;
}
if (line.EndsWith (": Invalid.") || line.EndsWith (": Valid.") || line.StartsWith ("labels:"))
continue;
if (line == "END_OF_MODEL" || line == "." || line == "*** END_MODEL")
continue;
var words = GetFunctionTokens (line);
if (words.Count == 0)
continue;
var lastWord = words [words.Count - 1];
if (currModel == null)
BadModel ("model begin marker not found");
if (line.StartsWith ("*** STATE ")) {
var name = line.Substring (10);
Model.CapturedState cs;
if (name == "<initial>")
cs = currModel.InitialState;
else
cs = currModel.MkState (name);
for (; ;) {
var tmpline = ReadLine ();
if (tmpline == "*** END_STATE")
break;
var tuple = GetFunctionTokens (tmpline);
if (tuple == null)
BadModel ("EOF in state table");
if (tuple.Count == 0)
continue;
if (tuple.Count == 3 && tuple [0] is string && tuple [1] is string && ((string)tuple [1]) == "->") {
cs.AddBinding ((string)tuple [0], GetElt (tuple [2]));
} else {
BadModel ("invalid state tuple definition");
}
}
continue;
}
if (words.Count == 3 && words [1] is string && ((string)words [1]) == "->") {
var funName = (string)words [0];
Model.Func fn = null;
if (lastWord is string && ((string)lastWord) == "{") {
fn = currModel.TryGetFunc (funName);
for (; ;) {
var tuple = GetFunctionTokens (ReadLine ());
if (tuple == null)
BadModel ("EOF in function table");
if (tuple.Count == 0)
continue;
string tuple0 = tuple [0] as string;
if (tuple.Count == 1) {
if (fn == null)
fn = currModel.MkFunc (funName, 1);
if (tuple0 == "}")
break;
if (fn.Else == null)
fn.Else = GetElt (tuple [0]);
continue;
}
string tuplePenultimate = tuple [tuple.Count - 2] as string;
if (tuplePenultimate != "->")
BadModel ("invalid function tuple definition");
var resultName = tuple [tuple.Count - 1];
if (tuple0 == "else") {
if (fn != null && !(resultName is string && ((string)resultName) == "#unspecified") && fn.Else == null) {
fn.Else = GetElt (resultName);
}
continue;
}
if (fn == null) {
var arity = tuple.Count - 2;
if (Regex.IsMatch (funName, "^MapType[0-9]*Select$")) {
funName = string.Format ("[{0}]", arity);
if (!selectFunctions.TryGetValue (arity, out fn)) {
fn = currModel.MkFunc (funName, arity);
selectFunctions.Add (arity, fn);
}
} else if (Regex.IsMatch (funName, "^MapType[0-9]*Store$")) {
funName = string.Format ("[{0}:=]", arity);
if (!storeFunctions.TryGetValue (arity, out fn)) {
fn = currModel.MkFunc (funName, arity);
storeFunctions.Add (arity, fn);
}
} else {
fn = currModel.MkFunc (funName, arity);
}
}
var args = new Model.Element[fn.Arity];
for (int i = 0; i < fn.Arity; ++i)
args [i] = GetElt (tuple [i]);
fn.AddApp (GetElt (resultName), args);
}
} else {
fn = currModel.MkFunc (funName, 0);
fn.SetConstant (GetElt (lastWord));
}
} else {
BadModel ("unidentified line");
}
}
}
}
}
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