diff options
Diffstat (limited to 'Dafny/Scanner.cs')
| -rw-r--r-- | Dafny/Scanner.cs | 191 |
1 files changed, 94 insertions, 97 deletions
diff --git a/Dafny/Scanner.cs b/Dafny/Scanner.cs index b23cdb25..ae887c47 100644 --- a/Dafny/Scanner.cs +++ b/Dafny/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
@@ -31,17 +31,15 @@ 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;
@@ -53,12 +51,12 @@ public class Buffer { 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;
@@ -75,14 +73,14 @@ public class Buffer { }
~Buffer() { Close(); }
-
+
protected void Close() {
if (!isUserStream && stream != null) {
stream.Close();
//stream = null;
}
}
-
+
public virtual int Read () {
if (bufPos < bufLen) {
return buf[bufPos++];
@@ -102,7 +100,7 @@ public class Buffer { Pos = curPos;
return ch;
}
-
+
public string/*!*/ GetString (int beg, int end) {
Contract.Ensures(Contract.Result<string>() != null);
int len = 0;
@@ -141,7 +139,7 @@ public class Buffer { }
}
}
-
+
// 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.
@@ -211,24 +209,23 @@ public class UTF8Buffer: Buffer { public class Scanner {
const char EOL = '\n';
const int eofSym = 0; /* pdt */
- const int maxT = 104;
- const int noSym = 104;
-
-
- [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);
- }
-
+ const int maxT = 105;
+ const int noSym = 105;
+
+
+[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
@@ -239,13 +236,13 @@ public class Scanner { 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 = 39; i <= 39; ++i) start[i] = 1;
@@ -293,9 +290,9 @@ public class Scanner { 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;
@@ -305,14 +302,15 @@ public class Scanner { 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);
@@ -321,9 +319,10 @@ public class Scanner { buffer = new Buffer(s, true);
this.errorHandler = errorHandler;
this.Filename = fileName;
+
Init();
}
-
+
void Init() {
pos = -1; line = 1; col = 0;
oldEols = 0;
@@ -344,11 +343,11 @@ public class Scanner { 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 +358,7 @@ public class Scanner { }
void NextCh() {
- if (oldEols > 0) { ch = EOL; oldEols--; }
+ if (oldEols > 0) { ch = EOL; oldEols--; }
else {
// pos = buffer.Pos;
// ch = buffer.Read(); col++;
@@ -367,9 +366,9 @@ public class Scanner { // // 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 +418,7 @@ public class Scanner { return;
}
-
+
}
}
@@ -531,16 +530,17 @@ public class Scanner { case "assert": t.kind = 64; break;
case "assume": t.kind = 65; break;
case "print": t.kind = 66; break;
- case "false": t.kind = 89; break;
- case "true": t.kind = 90; break;
- case "null": t.kind = 91; break;
- case "this": t.kind = 92; break;
- case "fresh": t.kind = 93; break;
- case "allocated": t.kind = 94; break;
- case "old": t.kind = 95; break;
- case "then": t.kind = 96; break;
- case "forall": t.kind = 98; break;
- case "exists": t.kind = 100; break;
+ case "parallel": t.kind = 67; break;
+ case "false": t.kind = 90; break;
+ case "true": t.kind = 91; break;
+ case "null": t.kind = 92; break;
+ case "this": t.kind = 93; break;
+ case "fresh": t.kind = 94; break;
+ case "allocated": t.kind = 95; break;
+ case "old": t.kind = 96; break;
+ case "then": t.kind = 97; break;
+ case "forall": t.kind = 99; break;
+ case "exists": t.kind = 101; break;
default: break;
}
}
@@ -557,13 +557,10 @@ public class Scanner { t.pos = pos; t.col = col; t.line = line;
t.filename = this.Filename;
int state;
- if (start.ContainsKey(ch)) {
- Contract.Assert(start[ch] != null);
- state = (int) start[ch];
- }
+ if (start.ContainsKey(ch)) { state = (int) cce.NonNull( start[ch]); }
else { state = 0; }
tlen = 0; AddCh();
-
+
switch (state) {
case -1: { t.kind = eofSym; break; } // NextCh already done
case 0: {
@@ -669,56 +666,56 @@ public class Scanner { if (ch == '>') {AddCh(); goto case 30;}
else {goto case 0;}
case 30:
- {t.kind = 67; break;}
- case 31:
{t.kind = 68; break;}
- case 32:
+ case 31:
{t.kind = 69; break;}
- case 33:
+ case 32:
{t.kind = 70; break;}
+ case 33:
+ {t.kind = 71; break;}
case 34:
if (ch == '&') {AddCh(); goto case 35;}
else {goto case 0;}
case 35:
- {t.kind = 71; break;}
- case 36:
{t.kind = 72; break;}
- case 37:
+ case 36:
{t.kind = 73; break;}
- case 38:
+ case 37:
{t.kind = 74; break;}
+ case 38:
+ {t.kind = 75; break;}
case 39:
- {t.kind = 77; break;}
- case 40:
{t.kind = 78; break;}
- case 41:
+ case 40:
{t.kind = 79; break;}
+ case 41:
+ {t.kind = 80; break;}
case 42:
- {t.kind = 81; break;}
- case 43:
{t.kind = 82; break;}
- case 44:
+ case 43:
{t.kind = 83; break;}
- case 45:
+ case 44:
{t.kind = 84; break;}
- case 46:
+ case 45:
{t.kind = 85; break;}
- case 47:
+ case 46:
{t.kind = 86; break;}
- case 48:
+ case 47:
{t.kind = 87; break;}
- case 49:
+ case 48:
{t.kind = 88; break;}
+ case 49:
+ {t.kind = 89; break;}
case 50:
- {t.kind = 97; break;}
+ {t.kind = 98; break;}
case 51:
- {t.kind = 99; break;}
+ {t.kind = 100; break;}
case 52:
- {t.kind = 101; break;}
- case 53:
{t.kind = 102; break;}
- case 54:
+ case 53:
{t.kind = 103; break;}
+ case 54:
+ {t.kind = 104; break;}
case 55:
recEnd = pos; recKind = 15;
if (ch == '>') {AddCh(); goto case 28;}
@@ -746,31 +743,31 @@ public class Scanner { if (ch == '.') {AddCh(); goto case 50;}
else {t.kind = 53; break;}
case 61:
- recEnd = pos; recKind = 80;
+ recEnd = pos; recKind = 81;
if (ch == '=') {AddCh(); goto case 40;}
else if (ch == '!') {AddCh(); goto case 41;}
- else {t.kind = 80; break;}
+ else {t.kind = 81; break;}
case 62:
- recEnd = pos; recKind = 75;
+ recEnd = pos; recKind = 76;
if (ch == '>') {AddCh(); goto case 32;}
- else {t.kind = 75; break;}
+ else {t.kind = 76; break;}
case 63:
- recEnd = pos; recKind = 76;
+ recEnd = pos; recKind = 77;
if (ch == '=') {AddCh(); goto case 29;}
- else {t.kind = 76; break;}
+ else {t.kind = 77; break;}
}
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);
@@ -791,7 +788,7 @@ public class Scanner { }
pt = pt.next;
} while (pt.kind > maxT); // skip pragmas
-
+
return pt;
}
|