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// StringHelper.cs
// Author: Sergey Chaban (serge@wildwestsoftware.com)
using System;
using System.Text;
namespace Mono.ILASM {
/// <summary>
/// </summary>
internal class StringHelper : StringHelperBase {
private static readonly string idChars = "_$@?";
/// <summary>
/// </summary>
/// <param name="host"></param>
public StringHelper (ILTokenizer host) : base (host)
{
}
/// <summary>
/// </summary>
/// <returns></returns>
public override bool Start (char ch)
{
mode = Token.UNKNOWN;
if (Char.IsLetter (ch) || idChars.IndexOf (ch) != -1) {
mode = Token.ID;
} else if (ch == '\'') {
mode = Token.SQSTRING;
} else if (ch == '"') {
mode = Token.QSTRING;
}
return (mode != Token.UNKNOWN);
}
private static bool IsIdChar (int c)
{
char ch = (char) c;
return (Char.IsLetterOrDigit(ch) || idChars.IndexOf (ch) != -1);
}
/// <summary>
/// </summary>
/// <returns></returns>
public override string Build ()
{
if (mode == Token.UNKNOWN) return String.Empty;
int ch = 0;
ILReader reader = host.Reader;
StringBuilder idsb = new StringBuilder ();
if (mode == Token.SQSTRING || mode == Token.QSTRING) {
int term = (mode == Token.SQSTRING) ? '\'' : '"';
reader.Read (); // skip quote
for (ch = reader.Read (); ch != -1; ch = reader.Read ()) {
if (ch == term) {
break;
}
if (ch == '\\') {
ch = reader.Read ();
/*
* Long string can be broken across multiple lines
* by using '\' as the last char in line.
* Any white space chars between '\' and the first
* char on the next line are ignored.
*/
if (ch == '\n') {
reader.SkipWhitespace ();
continue;
}
int escaped = Escape (ch);
if (escaped == -1) {
throw new ILSyntaxError("Invalid escape sequence.");
}
}
idsb.Append((char)ch);
}
} else { // ID
while ((ch = reader.Read ()) != -1) {
if (IsIdChar (ch)) {
idsb.Append ((char) ch);
} else {
reader.Unread (ch);
break;
}
}
}
return idsb.ToString ();
}
/// <summary>
/// </summary>
/// <param name="ch"></param>
/// <returns></returns>
public static int Escape (int ch)
{
int res = -1;
if (ch >= '0' && ch <='7') {
//TODO : octal code
} else {
int id = "abfnrtv\"'\\".IndexOf ((char)ch);
if (id != -1) {
res = "\a\b\f\n\r\t\v\"'\\" [id];
}
}
return res;
}
}
}
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