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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.Contracts;
namespace Boogie.Util {
public class TeeWriter : TextWriter {
readonly TextWriter! a;
readonly TextWriter! b;
public TeeWriter(TextWriter! a, TextWriter! b) {
this.a = a;
this.b = b;
}
public override System.Text.Encoding Encoding {
get {
return a.Encoding;
}
}
public override void Close() {
a.Close();
b.Close();
}
public override void Flush() {
a.Flush();
b.Flush();
}
[Pure]
public override string! ToString() {
return "<TeeWriter: " + a.ToString() + ", " + b.ToString() + ">";
}
public override void Write(char ch) {
a.Write(ch);
b.Write(ch);
}
public override void Write(string s) {
a.Write(s);
b.Write(s);
}
}
/// <summary>
/// A LineReader is a class that allows further subclasses to just override the ReadLine() method.
/// It simply reads from the given "reader".
/// </summary>
public class LineReader : TextReader {
[Rep] readonly TextReader! reader;
string readAhead;
int readAheadConsumed;
invariant readAhead == null || (0 <= readAheadConsumed && readAheadConsumed < readAhead.Length);
public LineReader([Captured] TextReader! reader) {
this.reader = reader;
}
public override void Close() {
expose (this) {
reader.Close();
}
}
public override int Read() {
expose (this) {
while (readAhead == null) {
readAhead = reader.ReadLine();
if (readAhead == null) {
// we're at EOF
return -1;
} else if (readAhead.Length > 0) {
readAheadConsumed = 0;
break;
}
}
int res = readAhead[readAheadConsumed++];
if (readAheadConsumed == readAhead.Length) {
readAhead = null;
}
return res;
}
}
public override int Read(char[]! buffer, int index, int count) {
int n = 0;
for (; n < count; n++) {
int ch = Read();
if (ch == -1) {
break;
}
buffer[index + n] = (char)ch;
}
return n;
}
public override string ReadLine() {
string res;
if (readAhead != null) {
expose (this) {
res = readAhead.Substring(readAheadConsumed);
readAhead = null;
}
} else {
res = reader.ReadLine();
}
return res;
}
}
public class IfdefReader : LineReader {
[Rep] readonly List<string!>! defines;
[Rep] readonly List<bool>! readState = new List<bool>();
int ignoreCutoff = 0; // 0 means we're not ignoring
invariant 0 <= ignoreCutoff && ignoreCutoff <= readState.Count;
public IfdefReader([Captured] TextReader! reader, [Captured] List<string!>! defines) {
base(reader);
this.defines = defines;
}
public override string ReadLine() {
while (true) {
string s = base.ReadLine();
if (s == null) {
return s;
}
string t = s.Trim();
if (t.StartsWith("#if")) {
string arg = t.Substring(3).TrimStart();
bool sense = true;
while (t.StartsWith("!")) {
sense = !sense;
t = t.Substring(1).TrimStart();
}
// push "true", since we're in a "then" branch
readState.Add(true);
if (ignoreCutoff == 0 && defines.Contains(arg) != sense) {
ignoreCutoff = readState.Count; // start ignoring
}
} else if (t == "#else") {
if (readState.Count == 0 || !readState[readState.Count-1]) {
return s; // malformed input; return the read line as if it were not special
}
// change the "true" to a "false" on top of the state, since we're now going into the "else" branch
readState[readState.Count-1] = false;
if (ignoreCutoff == 0) {
// the "then" branch had been included, so we'll ignore the "else" branch
ignoreCutoff = readState.Count;
} else if (ignoreCutoff == readState.Count) {
// we had ignored the "then" branch, so we'll include the "else" branch
ignoreCutoff = 0;
}
} else if (t == "#endif") {
if (readState.Count == 0) {
return s; // malformed input; return the read line as if it were not special
}
if (ignoreCutoff == readState.Count) {
// we had ignored the branch that ends here; so, now we start including again
ignoreCutoff = 0;
}
// pop
readState.RemoveAt(readState.Count-1);
} else if (ignoreCutoff == 0) {
return s;
}
}
}
}
}
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