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using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics.Contracts;
using Microsoft.Boogie;
namespace Microsoft.Boogie {
//-----------------------------------------------------------------------------------
// Buffer
//-----------------------------------------------------------------------------------
public class Buffer {
// This Buffer supports the following cases:
// 1) seekable stream (file)
// 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
byte[]/*!*/ buf; // input buffer
int bufStart; // position of first byte in buffer relative to input stream
int bufLen; // length of buffer
int fileLen; // length of input stream (may change if the stream is no file)
int bufPos; // current position in 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() {
Contract.Requires(s != null);
stream = s; this.isUserStream = isUserStream;
int fl, bl;
if (s.CanSeek) {
fl = (int) s.Length;
bl = fl < MAX_BUFFER_LENGTH ? fl : MAX_BUFFER_LENGTH; // Math.Min(fileLen, MAX_BUFFER_LENGTH);
bufStart = Int32.MaxValue; // nothing in the buffer so far
} else {
fl = bl = bufStart = 0;
}
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;
bufStart = b.bufStart;
bufLen = b.bufLen;
fileLen = b.fileLen;
bufPos = b.bufPos;
stream = b.stream;
// keep destructor from closing the stream
//b.stream = null;
isUserStream = b.isUserStream;
// keep destructor from closing the stream
b.isUserStream = true;
}
~Buffer() { Close(); }
protected void Close() {
if (!isUserStream && stream != null) {
stream.Close();
//stream = null;
}
}
public virtual int Read () {
if (bufPos < bufLen) {
return buf[bufPos++];
} else if (Pos < fileLen) {
Pos = Pos; // shift buffer start to Pos
return buf[bufPos++];
} else if (stream != null && !stream.CanSeek && ReadNextStreamChunk() > 0) {
return buf[bufPos++];
} else {
return EOF;
}
}
public int Peek () {
int curPos = Pos;
int ch = Read();
Pos = curPos;
return ch;
}
public string/*!*/ GetString (int beg, int end) {
Contract.Ensures(Contract.Result<string>() != null);
int len = 0;
char[] buf = new char[end - beg];
int oldPos = Pos;
Pos = beg;
while (Pos < end) buf[len++] = (char) Read();
Pos = oldPos;
return new String(buf, 0, len);
}
public int Pos {
get { return bufPos + bufStart; }
set {
if (value >= fileLen && stream != null && !stream.CanSeek) {
// Wanted position is after buffer and the stream
// is not seek-able e.g. network or console,
// thus we have to read the stream manually till
// the wanted position is in sight.
while (value >= fileLen && ReadNextStreamChunk() > 0);
}
if (value < 0 || value > fileLen) {
throw new FatalError("buffer out of bounds access, position: " + value);
}
if (value >= bufStart && value < bufStart + bufLen) { // already in buffer
bufPos = value - bufStart;
} else if (stream != null) { // must be swapped in
stream.Seek(value, SeekOrigin.Begin);
bufLen = stream.Read(buf, 0, buf.Length);
bufStart = value; bufPos = 0;
} else {
// set the position to the end of the file, Pos will return fileLen.
bufPos = fileLen - bufStart;
}
}
}
// 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.
private int ReadNextStreamChunk() {
int free = buf.Length - bufLen;
if (free == 0) {
// in the case of a growing input stream
// we can neither seek in the stream, nor can we
// foresee the maximum length, thus we must adapt
// the buffer size on demand.
byte[] newBuf = new byte[bufLen * 2];
Array.Copy(buf, newBuf, bufLen);
buf = newBuf;
free = bufLen;
}
int read = stream.Read(buf, bufLen, free);
if (read > 0) {
fileLen = bufLen = (bufLen + read);
return read;
}
// end of stream reached
return 0;
}
}
//-----------------------------------------------------------------------------------
// UTF8Buffer
//-----------------------------------------------------------------------------------
public class UTF8Buffer: Buffer {
public UTF8Buffer(Buffer/*!*/ b): base(b) {Contract.Requires(b != null);}
public override int Read() {
int ch;
do {
ch = base.Read();
// until we find a utf8 start (0xxxxxxx or 11xxxxxx)
} while ((ch >= 128) && ((ch & 0xC0) != 0xC0) && (ch != EOF));
if (ch < 128 || ch == EOF) {
// nothing to do, first 127 chars are the same in ascii and utf8
// 0xxxxxxx or end of file character
} else if ((ch & 0xF0) == 0xF0) {
// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
int c1 = ch & 0x07; ch = base.Read();
int c2 = ch & 0x3F; ch = base.Read();
int c3 = ch & 0x3F; ch = base.Read();
int c4 = ch & 0x3F;
ch = (((((c1 << 6) | c2) << 6) | c3) << 6) | c4;
} else if ((ch & 0xE0) == 0xE0) {
// 1110xxxx 10xxxxxx 10xxxxxx
int c1 = ch & 0x0F; ch = base.Read();
int c2 = ch & 0x3F; ch = base.Read();
int c3 = ch & 0x3F;
ch = (((c1 << 6) | c2) << 6) | c3;
} else if ((ch & 0xC0) == 0xC0) {
// 110xxxxx 10xxxxxx
int c1 = ch & 0x1F; ch = base.Read();
int c2 = ch & 0x3F;
ch = (c1 << 6) | c2;
}
return ch;
}
}
//-----------------------------------------------------------------------------------
// Scanner
//-----------------------------------------------------------------------------------
public class Scanner {
const char EOL = '\n';
const int eofSym = 0; /* pdt */
const int maxT = 95;
const int noSym = 95;
[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
int charPos;
int col; // column number of current character
int line; // line number of current character
int oldEols; // EOLs that appeared in a comment;
static readonly Hashtable/*!*/ start; // maps first token character to start state
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;
for (int i = 39; i <= 39; ++i) start[i] = 2;
for (int i = 46; i <= 46; ++i) start[i] = 2;
for (int i = 63; i <= 63; ++i) start[i] = 2;
for (int i = 65; i <= 90; ++i) start[i] = 2;
for (int i = 94; i <= 122; ++i) start[i] = 2;
for (int i = 126; i <= 126; ++i) start[i] = 2;
for (int i = 48; i <= 57; ++i) start[i] = 16;
for (int i = 34; i <= 34; ++i) start[i] = 6;
start[92] = 1;
start[59] = 19;
start[40] = 20;
start[41] = 21;
start[58] = 55;
start[44] = 22;
start[91] = 23;
start[93] = 24;
start[60] = 56;
start[62] = 57;
start[123] = 25;
start[125] = 58;
start[61] = 59;
start[42] = 60;
start[124] = 61;
start[8660] = 28;
start[8658] = 30;
start[8656] = 31;
start[38] = 32;
start[8743] = 34;
start[8744] = 36;
start[33] = 62;
start[8800] = 40;
start[8804] = 41;
start[8805] = 42;
start[43] = 63;
start[45] = 44;
start[47] = 45;
start[172] = 47;
start[8704] = 50;
start[8707] = 51;
start[955] = 52;
start[8226] = 54;
start[Buffer.EOF] = -1;
}
// [NotDelayed]
public Scanner (string/*!*/ fileName, Errors/*!*/ errorHandler) : base() {
Contract.Requires(fileName != null);
Contract.Requires(errorHandler != null);
this.errorHandler = errorHandler;
pt = tokens = new Token(); // first token is a dummy
t = new Token(); // dummy because t is a non-null field
try {
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() {
Contract.Requires(s != null);
Contract.Requires(errorHandler != null);
Contract.Requires(fileName != null);
pt = tokens = new Token(); // first token is a dummy
t = new Token(); // dummy because t is a non-null field
buffer = new Buffer(s, true);
this.errorHandler = errorHandler;
this.Filename = fileName;
Init();
}
void Init() {
pos = -1; line = 1; col = 0;
oldEols = 0;
NextCh();
if (ch == 0xEF) { // check optional byte order mark for UTF-8
NextCh(); int ch1 = ch;
NextCh(); int ch2 = ch;
if (ch1 != 0xBB || ch2 != 0xBF) {
throw new FatalError(String.Format("illegal byte order mark: EF {0,2:X} {1,2:X}", ch1, ch2));
}
buffer = new UTF8Buffer(buffer); col = 0;
NextCh();
}
pt = tokens = new Token(); // first token is a dummy
}
string/*!*/ ReadToEOL(){
Contract.Ensures(Contract.Result<string>() != null);
int p = buffer.Pos;
int 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;
while (ch != EOL && ch != Buffer.EOF){
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;
}
string/*!*/ s = buffer.GetString(p, buffer.Pos);
Contract.Assert(s!=null);
return s;
}
void NextCh() {
if (oldEols > 0) { ch = EOL; oldEols--; }
else {
// pos = buffer.Pos;
// ch = buffer.Read(); col++;
// // 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;
// if (ch == EOL) { line++; col = 0; }
while (true) {
pos = buffer.Pos;
ch = buffer.Read(); col++;
// 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;
if (ch == EOL) {
line++; col = 0;
} else if (ch == '#' && col == 1) {
int prLine = line;
int prColumn = 0;
string/*!*/ hashLine = ReadToEOL();
Contract.Assert(hashLine!=null);
col = 0;
line++;
hashLine = hashLine.TrimEnd(null);
if (hashLine.StartsWith("line ") || hashLine == "line") {
// parse #line pragma: #line num [filename]
string h = hashLine.Substring(4).TrimStart(null);
int x = h.IndexOf(' ');
if (x == -1) {
x = h.Length; // this will be convenient below when we look for a filename
}
try {
int li = int.Parse(h.Substring(0, x));
h = h.Substring(x).Trim();
// act on #line
line = li;
if (h.Length != 0) {
// a filename was specified
Filename = h;
}
continue; // successfully parsed and acted on the #line pragma
} catch (FormatException) {
// just fall down through to produce an error message
}
this.errorHandler.SemErr(Filename, prLine, prColumn, "Malformed (#line num [filename]) pragma: #" + hashLine);
continue;
}
this.errorHandler.SemErr(Filename, prLine, prColumn, "Unrecognized pragma: #" + hashLine);
continue;
}
return;
}
}
}
void AddCh() {
if (tlen >= tval.Length) {
char[] newBuf = new char[2 * tval.Length];
Array.Copy(tval, 0, newBuf, 0, tval.Length);
tval = newBuf;
}
if (ch != Buffer.EOF) {
tval[tlen++] = (char) ch;
NextCh();
}
}
bool Comment0() {
int level = 1, pos0 = pos, line0 = line, col0 = col, charPos0 = charPos;
NextCh();
if (ch == '/') {
NextCh();
for(;;) {
if (ch == 10) {
level--;
if (level == 0) { oldEols = line - line0; NextCh(); return true; }
NextCh();
} else if (ch == Buffer.EOF) return false;
else NextCh();
}
} else {
buffer.Pos = pos0; NextCh(); line = line0; col = col0; charPos = charPos0;
}
return false;
}
bool Comment1() {
int level = 1, pos0 = pos, line0 = line, col0 = col, charPos0 = charPos;
NextCh();
if (ch == '*') {
NextCh();
for(;;) {
if (ch == '*') {
NextCh();
if (ch == '/') {
level--;
if (level == 0) { oldEols = line - line0; NextCh(); return true; }
NextCh();
}
} else if (ch == '/') {
NextCh();
if (ch == '*') {
level++; NextCh();
}
} else if (ch == Buffer.EOF) return false;
else NextCh();
}
} else {
buffer.Pos = pos0; NextCh(); line = line0; col = col0; charPos = charPos0;
}
return false;
}
void CheckLiteral() {
switch (t.val) {
case "var": t.kind = 7; break;
case "where": t.kind = 13; break;
case "int": t.kind = 14; break;
case "real": t.kind = 15; break;
case "bool": t.kind = 16; break;
case "const": t.kind = 21; break;
case "unique": t.kind = 22; break;
case "extends": t.kind = 23; break;
case "complete": t.kind = 24; break;
case "function": t.kind = 25; break;
case "returns": t.kind = 26; break;
case "axiom": t.kind = 29; break;
case "type": t.kind = 30; break;
case "procedure": t.kind = 32; break;
case "implementation": t.kind = 33; break;
case "modifies": t.kind = 34; break;
case "free": t.kind = 35; break;
case "requires": t.kind = 36; break;
case "ensures": t.kind = 37; break;
case "goto": t.kind = 38; break;
case "return": t.kind = 39; break;
case "if": t.kind = 40; break;
case "else": t.kind = 41; break;
case "while": t.kind = 42; break;
case "invariant": t.kind = 43; break;
case "break": t.kind = 45; break;
case "assert": t.kind = 46; break;
case "assume": t.kind = 47; break;
case "havoc": t.kind = 48; break;
case "yield": t.kind = 49; break;
case "async": t.kind = 51; break;
case "call": t.kind = 52; break;
case "div": t.kind = 75; break;
case "mod": t.kind = 76; break;
case "false": t.kind = 81; break;
case "true": t.kind = 82; break;
case "old": t.kind = 83; break;
case "then": t.kind = 86; break;
case "forall": t.kind = 87; break;
case "exists": t.kind = 89; break;
case "lambda": t.kind = 91; break;
default: break;
}
}
Token/*!*/ NextToken() {
Contract.Ensures(Contract.Result<Token>() != null);
while (ch == ' ' ||
ch >= 9 && ch <= 10 || ch == 13
) NextCh();
if (ch == '/' && Comment0() ||ch == '/' && Comment1()) return NextToken();
int recKind = noSym;
int recEnd = pos;
t = new Token();
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];
}
else { state = 0; }
tlen = 0; AddCh();
switch (state) {
case -1: { t.kind = eofSym; break; } // NextCh already done
case 0: {
if (recKind != noSym) {
tlen = recEnd - t.pos;
SetScannerBehindT();
}
t.kind = recKind; break;
} // NextCh already done
case 1:
if (ch >= '#' && ch <= '$' || ch == 39 || ch == '.' || ch == '?' || ch >= 'A' && ch <= 'Z' || ch >= '^' && ch <= 'z' || ch == '~') {AddCh(); goto case 2;}
else {goto case 0;}
case 2:
recEnd = pos; recKind = 1;
if (ch >= '#' && ch <= '$' || ch == 39 || ch == '.' || ch >= '0' && ch <= '9' || ch == '?' || ch >= 'A' && ch <= 'Z' || ch >= '^' && ch <= 'z' || ch == '~') {AddCh(); goto case 2;}
else {t.kind = 1; t.val = new String(tval, 0, tlen); CheckLiteral(); return t;}
case 3:
if (ch == 'v') {AddCh(); goto case 4;}
else {goto case 0;}
case 4:
if (ch >= '0' && ch <= '9') {AddCh(); goto case 5;}
else {goto case 0;}
case 5:
recEnd = pos; recKind = 2;
if (ch >= '0' && ch <= '9') {AddCh(); goto case 5;}
else {t.kind = 2; break;}
case 6:
if (ch == '"') {AddCh(); goto case 7;}
else if (ch <= 9 || ch >= 11 && ch <= 12 || ch >= 14 && ch <= '!' || ch >= '#' && ch <= '[' || ch >= ']' && ch <= 65535) {AddCh(); goto case 6;}
else if (ch == 92) {AddCh(); goto case 17;}
else {goto case 0;}
case 7:
{t.kind = 4; break;}
case 8:
if (ch >= '0' && ch <= '9') {AddCh(); goto case 10;}
else if (ch == '-') {AddCh(); goto case 9;}
else {goto case 0;}
case 9:
if (ch >= '0' && ch <= '9') {AddCh(); goto case 10;}
else {goto case 0;}
case 10:
recEnd = pos; recKind = 5;
if (ch >= '0' && ch <= '9') {AddCh(); goto case 10;}
else {t.kind = 5; break;}
case 11:
if (ch >= '0' && ch <= '9') {AddCh(); goto case 12;}
else {goto case 0;}
case 12:
recEnd = pos; recKind = 6;
if (ch >= '0' && ch <= '9') {AddCh(); goto case 12;}
else if (ch == 'e') {AddCh(); goto case 13;}
else {t.kind = 6; break;}
case 13:
if (ch >= '0' && ch <= '9') {AddCh(); goto case 15;}
else if (ch == '-') {AddCh(); goto case 14;}
else {goto case 0;}
case 14:
if (ch >= '0' && ch <= '9') {AddCh(); goto case 15;}
else {goto case 0;}
case 15:
recEnd = pos; recKind = 6;
if (ch >= '0' && ch <= '9') {AddCh(); goto case 15;}
else {t.kind = 6; break;}
case 16:
recEnd = pos; recKind = 3;
if (ch >= '0' && ch <= '9') {AddCh(); goto case 16;}
else if (ch == 'b') {AddCh(); goto case 3;}
else if (ch == 'e') {AddCh(); goto case 8;}
else if (ch == '.') {AddCh(); goto case 11;}
else {t.kind = 3; break;}
case 17:
if (ch == '"') {AddCh(); goto case 18;}
else if (ch <= 9 || ch >= 11 && ch <= 12 || ch >= 14 && ch <= '!' || ch >= '#' && ch <= '[' || ch >= ']' && ch <= 65535) {AddCh(); goto case 6;}
else if (ch == 92) {AddCh(); goto case 17;}
else {goto case 0;}
case 18:
recEnd = pos; recKind = 4;
if (ch == '"') {AddCh(); goto case 7;}
else if (ch <= 9 || ch >= 11 && ch <= 12 || ch >= 14 && ch <= '!' || ch >= '#' && ch <= '[' || ch >= ']' && ch <= 65535) {AddCh(); goto case 6;}
else if (ch == 92) {AddCh(); goto case 17;}
else {t.kind = 4; break;}
case 19:
{t.kind = 8; break;}
case 20:
{t.kind = 9; break;}
case 21:
{t.kind = 10; break;}
case 22:
{t.kind = 12; break;}
case 23:
{t.kind = 17; break;}
case 24:
{t.kind = 18; break;}
case 25:
{t.kind = 27; break;}
case 26:
{t.kind = 50; break;}
case 27:
{t.kind = 54; break;}
case 28:
{t.kind = 55; break;}
case 29:
{t.kind = 56; break;}
case 30:
{t.kind = 57; break;}
case 31:
{t.kind = 59; break;}
case 32:
if (ch == '&') {AddCh(); goto case 33;}
else {goto case 0;}
case 33:
{t.kind = 60; break;}
case 34:
{t.kind = 61; break;}
case 35:
{t.kind = 62; break;}
case 36:
{t.kind = 63; break;}
case 37:
{t.kind = 66; break;}
case 38:
{t.kind = 67; break;}
case 39:
{t.kind = 68; break;}
case 40:
{t.kind = 69; break;}
case 41:
{t.kind = 70; break;}
case 42:
{t.kind = 71; break;}
case 43:
{t.kind = 72; break;}
case 44:
{t.kind = 74; break;}
case 45:
{t.kind = 77; break;}
case 46:
{t.kind = 78; break;}
case 47:
{t.kind = 80; break;}
case 48:
{t.kind = 84; break;}
case 49:
{t.kind = 85; break;}
case 50:
{t.kind = 88; break;}
case 51:
{t.kind = 90; break;}
case 52:
{t.kind = 92; break;}
case 53:
{t.kind = 93; break;}
case 54:
{t.kind = 94; break;}
case 55:
recEnd = pos; recKind = 11;
if (ch == '=') {AddCh(); goto case 26;}
else if (ch == ':') {AddCh(); goto case 53;}
else {t.kind = 11; break;}
case 56:
recEnd = pos; recKind = 19;
if (ch == '=') {AddCh(); goto case 64;}
else if (ch == ':') {AddCh(); goto case 39;}
else {t.kind = 19; break;}
case 57:
recEnd = pos; recKind = 20;
if (ch == '=') {AddCh(); goto case 37;}
else {t.kind = 20; break;}
case 58:
recEnd = pos; recKind = 28;
if (ch == '|') {AddCh(); goto case 49;}
else {t.kind = 28; break;}
case 59:
recEnd = pos; recKind = 31;
if (ch == '=') {AddCh(); goto case 65;}
else {t.kind = 31; break;}
case 60:
recEnd = pos; recKind = 44;
if (ch == '*') {AddCh(); goto case 46;}
else {t.kind = 44; break;}
case 61:
recEnd = pos; recKind = 53;
if (ch == '|') {AddCh(); goto case 35;}
else if (ch == '{') {AddCh(); goto case 48;}
else {t.kind = 53; break;}
case 62:
recEnd = pos; recKind = 79;
if (ch == '=') {AddCh(); goto case 38;}
else {t.kind = 79; break;}
case 63:
recEnd = pos; recKind = 73;
if (ch == '+') {AddCh(); goto case 43;}
else {t.kind = 73; break;}
case 64:
recEnd = pos; recKind = 65;
if (ch == '=') {AddCh(); goto case 66;}
else {t.kind = 65; break;}
case 65:
recEnd = pos; recKind = 64;
if (ch == '>') {AddCh(); goto case 29;}
else {t.kind = 64; break;}
case 66:
recEnd = pos; recKind = 58;
if (ch == '>') {AddCh(); goto case 27;}
else {t.kind = 58; 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);
if (tokens.next == null) {
return NextToken();
} else {
pt = tokens = tokens.next;
return tokens;
}
}
// peek for the next token, ignore pragmas
public Token/*!*/ Peek () {
Contract.Ensures(Contract.Result<Token>() != null);
do {
if (pt.next == null) {
pt.next = NextToken();
}
pt = pt.next;
} while (pt.kind > maxT); // skip pragmas
return pt;
}
// make sure that peeking starts at the current scan position
public void ResetPeek () { pt = tokens; }
} // end Scanner
public delegate void ErrorProc(int n, string filename, int line, int col);
}
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