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// ILTokenizer.cs
// Author: Sergey Chaban (serge@wildwestsoftware.com)
using System;
using System.IO;
using System.Collections;
namespace Mono.ILASM {
/// <summary>
/// </summary>
public class ILTokenizer : ITokenStream {
private static Hashtable opcodes;
private static Hashtable keywords;
private static Hashtable directives;
private ILToken lastToken;
private ILReader reader;
private StringHelper strBuilder;
private NumberHelper numBuilder;
static ILTokenizer()
{
opcodes = ILTables.Opcodes;
keywords = ILTables.Keywords;
directives = ILTables.Directives;
}
/// <summary>
/// </summary>
/// <param name="reader"></param>
public ILTokenizer (StreamReader reader)
{
this.reader = new ILReader (reader);
strBuilder = new StringHelper (this);
numBuilder = new NumberHelper (this);
lastToken = ILToken.Invalid.Clone () as ILToken;
}
/// <summary>
/// </summary>
public ILReader Reader {
get {
return reader;
}
}
/// <summary>
/// </summary>
/// <returns></returns>
public ILToken GetNextToken ()
{
if (lastToken == ILToken.EOF) return ILToken.EOF;
int ch;
int next;
ILToken res = ILToken.EOF.Clone () as ILToken;
while ((ch = reader.Read ()) != -1) {
if (ch == '.' || ch == '#') {
next = reader.Peek ();
if (ch == '.' && Char.IsDigit((char) next)) {
numBuilder.Start (ch);
reader.Unread (ch);
numBuilder.Build ();
if (numBuilder.ResultToken != ILToken.Invalid) {
res.CopyFrom (numBuilder.ResultToken);
break;
}
} else {
reader.MarkLocation ();
if (strBuilder.Start (next) && strBuilder.TokenId == Token.ID) {
string dirBody = strBuilder.Build ();
string dir = new string ((char) ch, 1) + dirBody;
if (IsDirective (dir)) {
res = ILTables.Directives [dir] as ILToken;
} else {
reader.Unread (dirBody.ToCharArray ());
reader.RestoreLocation ();
res = ILToken.Dot;
}
} else {
res = ILToken.Dot;
}
break;
}
}
// Comments
if (ch == '/') {
next = reader.Peek ();
if (next == '/') {
// double-slash comment, skip to the end of the line.
for (reader.Read ();
next != -1 && next != '\n';
next = reader.Read ());
continue;
} else if (next == '*') {
for (reader.Read ();
next != -1 && next != '*' && reader.Peek () != '/';
next = reader.Read ());
reader.Read ();
continue;
}
}
// Numbers
if (numBuilder.Start (ch)) {
reader.Unread (ch);
numBuilder.Build ();
if (numBuilder.ResultToken != ILToken.Invalid) {
res.CopyFrom (numBuilder.ResultToken);
break;
}
}
// Punctuation
ILToken punct = ILToken.GetPunctuation (ch);
if (punct != null) {
if (punct == ILToken.Colon && reader.Peek () == ':') {
reader.Read ();
res = ILToken.DoubleColon;
} else {
res = punct;
}
break;
}
// ID | QSTRING | SQSTRING | INSTR_* | KEYWORD
if (strBuilder.Start (ch)) {
reader.Unread (ch);
string val = strBuilder.Build ();
if (strBuilder.TokenId == Token.ID) {
next = reader.Peek ();
if (next == '.') {
reader.MarkLocation ();
ch = reader.Read ();
next = reader.Peek ();
if (Char.IsLetterOrDigit ((char) next)) {
string opTail = reader.ReadToWhitespace ();
ILToken op = ILTables.Opcodes [val + "." + opTail] as ILToken;
if (op == null) {
reader.Unread (opTail.ToCharArray ());
reader.RestoreLocation ();
reader.Unread (ch);
} else {
res = op;
break;
}
}
}
if (IsOpcode (val)) {
res = ILTables.Opcodes [val] as ILToken;
break;
}
if (IsKeyword (val)) {
res = ILTables.Keywords [val] as ILToken;
break;
}
}
res.token = strBuilder.TokenId;
res.val = val;
break;
}
}
lastToken.CopyFrom (res);
return res;
}
/// <summary>
/// </summary>
public ILToken NextToken {
get {
return GetNextToken ();
}
}
/// <summary>
/// </summary>
public ILToken LastToken {
get {
return lastToken;
}
}
/// <summary>
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public static bool IsOpcode (string name)
{
return opcodes.Contains (name);
}
/// <summary>
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public static bool IsDirective (string name)
{
char ch = name [0];
bool res = (ch == '.' || ch == '#');
if (res) {
res = directives.Contains (name);
}
return res;
}
/// <summary>
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public static bool IsKeyword (string name)
{
return keywords.Contains (name);
}
}
}
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