Factored out the ParserHelper class into a separate project and updated the files generated by Coco/R.

This was done to support sharing of the Coco/R .frame files with Spec#.

1 files changed, 53 insertions, 49 deletions

diff --git a/Source/Core/Scanner.cs b/Source/Core/Scanner.cs
index faab5837..7c3522ca 100644
--- a/Source/Core/Scanner.cs
+++ b/Source/Core/Scanner.cs
@@ -19,7 +19,7 @@ public class Buffer {
 	//    a) whole stream in buffer

 	//    b) part of stream in buffer

 	// 2) non seekable stream (network, console)

-  

+

 	public const int EOF = 65535 + 1; // char.MaxValue + 1;

 	const int MIN_BUFFER_LENGTH = 1024; // 1KB

 	const int MAX_BUFFER_LENGTH = MIN_BUFFER_LENGTH * 64; // 64KB

@@ -31,15 +31,17 @@ public class Buffer {
 	Stream/*!*/ stream;      // input stream (seekable)

 	bool isUserStream;  // was the stream opened by the user?

 

-[ContractInvariantMethod]

-void ObjectInvariant(){

-  Contract.Invariant(buf != null);

-  Contract.Invariant(stream != null);}

-    [NotDelayed]

-	public Buffer (Stream/*!*/ s, bool isUserStream) :base() {

+	[ContractInvariantMethod]

+	void ObjectInvariant(){

+		Contract.Invariant(buf != null);

+		Contract.Invariant(stream != null);

+	}

+

+//  [NotDelayed]

+	public Buffer (Stream/*!*/ s, bool isUserStream) : base() {

 	  Contract.Requires(s != null);

 		stream = s; this.isUserStream = isUserStream;

-		

+

 		int fl, bl;

 		if (s.CanSeek) {

 			fl = (int) s.Length;

@@ -51,12 +53,12 @@ void ObjectInvariant(){
 

 		buf = new byte[(bl>0) ? bl : MIN_BUFFER_LENGTH];

 		fileLen = fl;  bufLen = bl;

-		

+

 		if (fileLen > 0) Pos = 0; // setup buffer to position 0 (start)

 		else bufPos = 0; // index 0 is already after the file, thus Pos = 0 is invalid

 		if (bufLen == fileLen && s.CanSeek) Close();

 	}

-	

+

 	protected Buffer(Buffer/*!*/ b) { // called in UTF8Buffer constructor

 	  Contract.Requires(b != null);

 		buf = b.buf;

@@ -73,14 +75,14 @@ void ObjectInvariant(){
 	}

 

 	~Buffer() { Close(); }

-	

+

 	protected void Close() {

 		if (!isUserStream && stream != null) {

 			stream.Close();

 			//stream = null;

 		}

 	}

-	

+

 	public virtual int Read () {

 		if (bufPos < bufLen) {

 			return buf[bufPos++];

@@ -100,7 +102,7 @@ void ObjectInvariant(){
 		Pos = curPos;

 		return ch;

 	}

-	

+

 	public string/*!*/ GetString (int beg, int end) {

 	  Contract.Ensures(Contract.Result<string>() != null);

 		int len = 0;

@@ -139,7 +141,7 @@ void ObjectInvariant(){
 			}

 		}

 	}

-	

+

 	// Read the next chunk of bytes from the stream, increases the buffer

 	// if needed and updates the fields fileLen and bufLen.

 	// Returns the number of bytes read.

@@ -213,19 +215,20 @@ public class Scanner {
 	const int noSym = 88;

 

 

-[ContractInvariantMethod]

-void objectInvariant(){

-  Contract.Invariant(buffer!=null);

-  Contract.Invariant(t != null);

-  Contract.Invariant(start != null);

-  Contract.Invariant(tokens != null);

-  Contract.Invariant(pt != null);

-  Contract.Invariant(tval != null);

-  Contract.Invariant(Filename != null);

-  Contract.Invariant(errorHandler != null);

-}

+	[ContractInvariantMethod]

+	void objectInvariant(){

+		Contract.Invariant(buffer!=null);

+		Contract.Invariant(t != null);

+		Contract.Invariant(start != null);

+		Contract.Invariant(tokens != null);

+		Contract.Invariant(pt != null);

+		Contract.Invariant(tval != null);

+		Contract.Invariant(Filename != null);

+		Contract.Invariant(errorHandler != null);

+	}

+

 	public Buffer/*!*/ buffer; // scanner buffer

-	

+

 	Token/*!*/ t;          // current token

 	int ch;           // current input character

 	int pos;          // byte position of current character

@@ -236,13 +239,13 @@ void objectInvariant(){
 

 	Token/*!*/ tokens;     // list of tokens already peeked (first token is a dummy)

 	Token/*!*/ pt;         // current peek token

-	

+

 	char[]/*!*/ tval = new char[128]; // text of current token

 	int tlen;         // length of current token

-	

+

 	private string/*!*/ Filename;

 	private Errors/*!*/ errorHandler;

-	

+

 	static Scanner() {

 		start = new Hashtable(128);

 		for (int i = 35; i <= 36; ++i) start[i] = 2;

@@ -291,9 +294,9 @@ void objectInvariant(){
 		start[Buffer.EOF] = -1;

 

 	}

-	

-	[NotDelayed]

-	public Scanner (string/*!*/ fileName, Errors/*!*/ errorHandler) :base(){

+

+//	[NotDelayed]

+	public Scanner (string/*!*/ fileName, Errors/*!*/ errorHandler) : base() {

 	  Contract.Requires(fileName != null);

 	  Contract.Requires(errorHandler != null);

 		this.errorHandler = errorHandler;

@@ -303,15 +306,14 @@ void objectInvariant(){
 			Stream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);

 			buffer = new Buffer(stream, false);

 			Filename = fileName;

-			

 			Init();

 		} catch (IOException) {

 			throw new FatalError("Cannot open file " + fileName);

 		}

 	}

-	

-	[NotDelayed]

-	public Scanner (Stream/*!*/ s, Errors/*!*/ errorHandler, string/*!*/ fileName) :base(){

+

+//	[NotDelayed]

+	public Scanner (Stream/*!*/ s, Errors/*!*/ errorHandler, string/*!*/ fileName) : base() {

 	  Contract.Requires(s != null);

 	  Contract.Requires(errorHandler != null);

 	  Contract.Requires(fileName != null);

@@ -320,10 +322,9 @@ void objectInvariant(){
 		buffer = new Buffer(s, true);

 		this.errorHandler = errorHandler;

 		this.Filename = fileName;

-		

 		Init();

 	}

-	

+

 	void Init() {

 		pos = -1; line = 1; col = 0;

 		oldEols = 0;

@@ -344,11 +345,11 @@ void objectInvariant(){
 	Contract.Ensures(Contract.Result<string>() != null);

 	  int p = buffer.Pos;

 	  int ch = buffer.Read();

-      // replace isolated '\r' by '\n' in order to make

+	  // replace isolated '\r' by '\n' in order to make

 	  // eol handling uniform across Windows, Unix and Mac

 	  if (ch == '\r' && buffer.Peek() != '\n') ch = EOL;

 	  while (ch != EOL && ch != Buffer.EOF){

-	    ch = buffer.Read();

+		ch = buffer.Read();

 		// replace isolated '\r' by '\n' in order to make

 		// eol handling uniform across Windows, Unix and Mac

 		if (ch == '\r' && buffer.Peek() != '\n') ch = EOL;

@@ -359,7 +360,7 @@ void objectInvariant(){
 	}

 

 	void NextCh() {

-		if (oldEols > 0) { ch = EOL; oldEols--; } 

+		if (oldEols > 0) { ch = EOL; oldEols--; }

 		else {

 //			pos = buffer.Pos;

 //			ch = buffer.Read(); col++;

@@ -367,9 +368,9 @@ void objectInvariant(){
 //			// eol handling uniform across Windows, Unix and Mac

 //			if (ch == '\r' && buffer.Peek() != '\n') ch = EOL;

 //			if (ch == EOL) { line++; col = 0; }

-			

+

 			while (true) {

-			    pos = buffer.Pos;

+				pos = buffer.Pos;

 				ch = buffer.Read(); col++;

 				// replace isolated '\r' by '\n' in order to make

 				// eol handling uniform across Windows, Unix and Mac

@@ -419,7 +420,7 @@ void objectInvariant(){
 				return;

 			  }

 

-			

+

 		}

 

 	}

@@ -539,10 +540,13 @@ void objectInvariant(){
 		t.pos = pos; t.col = col; t.line = line;

 		t.filename = this.Filename;

 		int state;

-		if (start.ContainsKey(ch)) { state = (int) cce.NonNull( start[ch]); }

+		if (start.ContainsKey(ch)) {

+			Contract.Assert(start[ch] != null);

+			state = (int) start[ch];

+		}

 		else { state = 0; }

 		tlen = 0; AddCh();

-		

+

 		switch (state) {

 			case -1: { t.kind = eofSym; break; } // NextCh already done

 			case 0: {

@@ -711,14 +715,14 @@ void objectInvariant(){
 		t.val = new String(tval, 0, tlen);

 		return t;

 	}

-	

+

 	private void SetScannerBehindT() {

 		buffer.Pos = t.pos;

 		NextCh();

 		line = t.line; col = t.col;

 		for (int i = 0; i < tlen; i++) NextCh();

 	}

-	

+

 	// get the next token (possibly a token already seen during peeking)

 	public Token/*!*/ Scan () {

 	 Contract.Ensures(Contract.Result<Token>() != null);

@@ -739,7 +743,7 @@ void objectInvariant(){
 			}

 			pt = pt.next;

 		} while (pt.kind > maxT); // skip pragmas

-	

+

 		return pt;

 	}