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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics.Contracts;
using Microsoft.Boogie;
namespace Microsoft.Dafny {
class Util
{
public static string Comma<T>(IEnumerable<T> l, Func<T, string> f) {
return Comma(",", l, f);
}
public static string Comma<T>(string comma, IEnumerable<T> l, Func<T,string> f) {
string res = "";
string c = "";
foreach(var t in l) {
res += c + f(t);
c = comma;
}
return res;
}
public static List<B> Map<A,B>(IEnumerable<A> xs, Func<A,B> f)
{
List<B> ys = new List<B>();
foreach (A x in xs) {
ys.Add(f(x));
}
return ys;
}
public static List<A> Nil<A>() {
return new List<A>();
}
public static List<A> Singleton<A>(A x) {
return new List<A> { x };
}
public static List<A> Cons<A>(A x, List<A> xs) {
return Concat(Singleton(x), xs);
}
public static List<A> Snoc<A>(List<A> xs, A x) {
return Concat(xs, Singleton(x));
}
public static List<A> Concat<A>(List<A> xs, List<A> ys) {
List<A> cpy = new List<A>(xs);
cpy.AddRange(ys);
return cpy;
}
public static Dictionary<A,B> Dict<A,B>(IEnumerable<A> xs, IEnumerable<B> ys) {
return Dict<A,B>(xs.Zip(ys));
}
public static Dictionary<A,B> Dict<A,B>(IEnumerable<Tuple<A,B>> xys) {
Dictionary<A,B> res = new Dictionary<A,B>();
foreach (var p in xys) {
res[p.Item1] = p.Item2;
}
return res;
}
/// <summary>
/// Returns s but with all occurrences of '_' removed.
/// </summary>
public static string RemoveUnderscores(string s) {
Contract.Requires(s != null);
while (true) {
var j = s.IndexOf('_');
if (j == -1) {
return s;
}
s = s.Substring(0, j) + s.Substring(j + 1);
}
}
/// <summary>
/// For "S" returns S and false.
/// For @"S" return S and true.
/// Assumes that s has one of these forms.
/// </summary>
public static string RemoveParsedStringQuotes(string s, out bool isVerbatimString) {
Contract.Requires(s != null);
var len = s.Length;
if (s[0] == '@') {
isVerbatimString = true;
return s.Substring(2, len - 3);
} else {
isVerbatimString = false;
return s.Substring(1, len - 2);
}
}
/// <summary>
/// Replaced any escaped characters in s by the actual character that the escaping represents.
/// Assumes s to be a well-parsed string.
/// </summary>
public static string RemoveEscaping(string s, bool isVerbatimString) {
Contract.Requires(s != null);
var sb = new StringBuilder();
UnescapedCharacters(s, isVerbatimString).Iter(ch => sb.Append(ch));
return sb.ToString();
}
/// <summary>
/// Returns the characters of the well-parsed string p, replacing any
/// escaped characters by the actual characters.
/// </summary>
public static IEnumerable<char> UnescapedCharacters(string p, bool isVerbatimString) {
Contract.Requires(p != null);
if (isVerbatimString) {
var skipNext = false;
foreach (var ch in p) {
if (skipNext) {
skipNext = false;
} else {
yield return ch;
if (ch == '"') {
skipNext = true;
}
}
}
} else {
var i = 0;
while (i < p.Length) {
char special = ' '; // ' ' indicates not special
if (p[i] == '\\') {
switch (p[i + 1]) {
case '\'': special = '\''; break;
case '\"': special = '\"'; break;
case '\\': special = '\\'; break;
case '\0': special = '\0'; break;
case 'n': special = '\n'; break;
case 'r': special = '\r'; break;
case 't': special = '\t'; break;
case 'u':
int ch = HexValue(p[i + 2]);
ch = 16 * ch + HexValue(p[i + 3]);
ch = 16 * ch + HexValue(p[i + 4]);
ch = 16 * ch + HexValue(p[i + 5]);
yield return (char)ch;
i += 6;
continue;
default:
break;
}
}
if (special != ' ') {
yield return special;
i += 2;
} else {
yield return p[i];
i++;
}
}
}
}
/// <summary>
/// Converts a hexadecimal digit to an integer.
/// Assumes ch does represent a hexadecimal digit; alphabetic digits can be in either case.
/// </summary>
public static int HexValue(char ch) {
if ('a' <= ch && ch <= 'f') {
return ch - 'a' + 10;
} else if ('A' <= ch && ch <= 'F') {
return ch - 'A' + 10;
} else {
return ch - '0';
}
}
}
}
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