2 // cs-tokenizer.cs: The Tokenizer for the C# compiler
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3 // This also implements the preprocessor
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5 // Author: Miguel de Icaza (miguel@gnu.org)
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7 // Licensed under the terms of the GNU GPL
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9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
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14 * Make sure we accept the proper Unicode ranges, per the spec.
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20 using System.Collections;
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22 using System.Globalization;
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23 using System.Reflection;
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25 namespace Mono.CSharp
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28 /// Tokenizer for C# source code.
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31 public class Tokenizer : yyParser.yyInput
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33 StreamReader reader;
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34 public string ref_name;
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35 public int ref_line = 1;
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36 public int line = 1;
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38 public int current_token;
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39 bool handle_get_set = false;
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40 bool handle_remove_add = false;
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41 bool handle_assembly = false;
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44 // Whether tokens have been seen on this line
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46 bool tokens_seen = false;
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49 // Whether a token has been seen on the file
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50 // This is needed because `define' is not allowed to be used
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51 // after a token has been seen.
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53 bool any_token_seen = false;
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54 static Hashtable tokenValues;
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56 private static Hashtable TokenValueName
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59 if (tokenValues == null)
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60 tokenValues = GetTokenValueNameHash ();
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66 private static Hashtable GetTokenValueNameHash ()
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68 Type t = typeof (Token);
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69 FieldInfo [] fields = t.GetFields ();
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70 Hashtable hash = new Hashtable ();
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71 foreach (FieldInfo field in fields) {
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72 if (field.IsLiteral && field.IsStatic && field.FieldType == typeof (int))
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73 hash.Add (field.GetValue (null), field.Name);
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79 // Returns a verbose representation of the current location
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81 public string location {
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85 if (current_token == Token.ERROR)
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86 det = "detail: " + error_details;
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90 // return "Line: "+line+" Col: "+col + "\n" +
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91 // "VirtLine: "+ref_line +
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92 // " Token: "+current_token + " " + det;
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93 string current_token_name = TokenValueName [current_token] as string;
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94 if (current_token_name == null)
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95 current_token_name = current_token.ToString ();
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97 return String.Format ("{0} ({1},{2}), Token: {3} {4}", ref_name,
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100 current_token_name,
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105 public bool PropertyParsing {
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107 return handle_get_set;
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111 handle_get_set = value;
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115 public bool AssemblyTargetParsing {
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117 return handle_assembly;
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121 handle_assembly = value;
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125 public bool EventParsing {
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127 return handle_remove_add;
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131 handle_remove_add = value;
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138 static Hashtable keywords;
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139 static NumberStyles styles;
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140 static NumberFormatInfo csharp_format_info;
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143 // Values for the associated token returned
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153 const int TAKING = 1;
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154 const int TAKEN_BEFORE = 2;
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155 const int ELSE_SEEN = 4;
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156 const int PARENT_TAKING = 8;
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159 // pre-processor if stack state:
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163 static System.Text.StringBuilder id_builder;
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164 static System.Text.StringBuilder string_builder;
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165 static System.Text.StringBuilder number_builder;
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168 // Details about the error encoutered by the tokenizer
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170 string error_details;
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172 public string error {
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174 return error_details;
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190 static void InitTokens ()
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192 keywords = new Hashtable ();
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194 keywords.Add ("abstract", Token.ABSTRACT);
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195 keywords.Add ("as", Token.AS);
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196 keywords.Add ("add", Token.ADD);
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197 keywords.Add ("assembly", Token.ASSEMBLY);
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198 keywords.Add ("base", Token.BASE);
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199 keywords.Add ("bool", Token.BOOL);
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200 keywords.Add ("break", Token.BREAK);
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201 keywords.Add ("byte", Token.BYTE);
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202 keywords.Add ("case", Token.CASE);
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203 keywords.Add ("catch", Token.CATCH);
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204 keywords.Add ("char", Token.CHAR);
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205 keywords.Add ("checked", Token.CHECKED);
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206 keywords.Add ("class", Token.CLASS);
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207 keywords.Add ("const", Token.CONST);
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208 keywords.Add ("continue", Token.CONTINUE);
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209 keywords.Add ("decimal", Token.DECIMAL);
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210 keywords.Add ("default", Token.DEFAULT);
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211 keywords.Add ("delegate", Token.DELEGATE);
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212 keywords.Add ("do", Token.DO);
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213 keywords.Add ("double", Token.DOUBLE);
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214 keywords.Add ("else", Token.ELSE);
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215 keywords.Add ("enum", Token.ENUM);
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216 keywords.Add ("event", Token.EVENT);
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217 keywords.Add ("explicit", Token.EXPLICIT);
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218 keywords.Add ("extern", Token.EXTERN);
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219 keywords.Add ("false", Token.FALSE);
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220 keywords.Add ("finally", Token.FINALLY);
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221 keywords.Add ("fixed", Token.FIXED);
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222 keywords.Add ("float", Token.FLOAT);
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223 keywords.Add ("for", Token.FOR);
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224 keywords.Add ("foreach", Token.FOREACH);
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225 keywords.Add ("goto", Token.GOTO);
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226 keywords.Add ("get", Token.GET);
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227 keywords.Add ("if", Token.IF);
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228 keywords.Add ("implicit", Token.IMPLICIT);
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229 keywords.Add ("in", Token.IN);
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230 keywords.Add ("int", Token.INT);
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231 keywords.Add ("interface", Token.INTERFACE);
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232 keywords.Add ("internal", Token.INTERNAL);
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233 keywords.Add ("is", Token.IS);
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234 keywords.Add ("lock", Token.LOCK);
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235 keywords.Add ("long", Token.LONG);
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236 keywords.Add ("namespace", Token.NAMESPACE);
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237 keywords.Add ("new", Token.NEW);
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238 keywords.Add ("null", Token.NULL);
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239 keywords.Add ("object", Token.OBJECT);
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240 keywords.Add ("operator", Token.OPERATOR);
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241 keywords.Add ("out", Token.OUT);
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242 keywords.Add ("override", Token.OVERRIDE);
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243 keywords.Add ("params", Token.PARAMS);
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244 keywords.Add ("private", Token.PRIVATE);
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245 keywords.Add ("protected", Token.PROTECTED);
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246 keywords.Add ("public", Token.PUBLIC);
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247 keywords.Add ("readonly", Token.READONLY);
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248 keywords.Add ("ref", Token.REF);
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249 keywords.Add ("remove", Token.REMOVE);
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250 keywords.Add ("return", Token.RETURN);
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251 keywords.Add ("sbyte", Token.SBYTE);
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252 keywords.Add ("sealed", Token.SEALED);
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253 keywords.Add ("set", Token.SET);
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254 keywords.Add ("short", Token.SHORT);
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255 keywords.Add ("sizeof", Token.SIZEOF);
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256 keywords.Add ("stackalloc", Token.STACKALLOC);
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257 keywords.Add ("static", Token.STATIC);
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258 keywords.Add ("string", Token.STRING);
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259 keywords.Add ("struct", Token.STRUCT);
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260 keywords.Add ("switch", Token.SWITCH);
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261 keywords.Add ("this", Token.THIS);
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262 keywords.Add ("throw", Token.THROW);
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263 keywords.Add ("true", Token.TRUE);
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264 keywords.Add ("try", Token.TRY);
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265 keywords.Add ("typeof", Token.TYPEOF);
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266 keywords.Add ("uint", Token.UINT);
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267 keywords.Add ("ulong", Token.ULONG);
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268 keywords.Add ("unchecked", Token.UNCHECKED);
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269 keywords.Add ("unsafe", Token.UNSAFE);
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270 keywords.Add ("ushort", Token.USHORT);
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271 keywords.Add ("using", Token.USING);
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272 keywords.Add ("virtual", Token.VIRTUAL);
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273 keywords.Add ("void", Token.VOID);
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274 keywords.Add ("volatile", Token.VOLATILE);
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275 keywords.Add ("while", Token.WHILE);
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279 // Class initializer
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281 static Tokenizer ()
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284 csharp_format_info = NumberFormatInfo.InvariantInfo;
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285 styles = NumberStyles.Float;
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287 id_builder = new System.Text.StringBuilder ();
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288 string_builder = new System.Text.StringBuilder ();
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289 number_builder = new System.Text.StringBuilder ();
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292 bool is_keyword (string name)
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296 res = keywords.Contains (name);
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297 if (handle_get_set == false && (name == "get" || name == "set"))
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299 if (handle_remove_add == false && (name == "remove" || name == "add"))
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301 if (handle_assembly == false && (name == "assembly"))
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306 int GetKeyword (string name)
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308 return (int) (keywords [name]);
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311 public Location Location {
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313 return new Location (ref_line);
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317 void define (string def)
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319 if (!RootContext.AllDefines.Contains (def)){
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320 RootContext.AllDefines [def] = true;
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322 if (defines.Contains (def))
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324 defines [def] = true;
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327 public Tokenizer (StreamReader input, string fname, ArrayList defs)
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329 this.ref_name = fname;
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335 defines = new Hashtable ();
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336 foreach (string def in defs)
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341 // FIXME: This could be `Location.Push' but we have to
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342 // find out why the MS compiler allows this
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344 Mono.CSharp.Location.Push (fname);
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347 bool is_identifier_start_character (char c)
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349 return Char.IsLetter (c) || c == '_' ;
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352 bool is_identifier_part_character (char c)
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354 return (Char.IsLetter (c) || Char.IsDigit (c) || c == '_');
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357 int is_punct (char c, ref bool doread)
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366 return Token.OPEN_BRACE;
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368 return Token.CLOSE_BRACE;
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370 return Token.OPEN_BRACKET;
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372 return Token.CLOSE_BRACKET;
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374 return Token.OPEN_PARENS;
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376 return Token.CLOSE_PARENS;
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378 return Token.COMMA;
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380 return Token.COLON;
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382 return Token.SEMICOLON;
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384 return Token.TILDE;
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386 return Token.INTERR;
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395 t = Token.OP_ADD_ASSIGN;
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405 t = Token.OP_SUB_ASSIGN;
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409 return Token.MINUS;
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417 return Token.OP_NE;
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425 return Token.OP_EQ;
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427 return Token.ASSIGN;
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433 return Token.OP_AND;
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434 } else if (d == '='){
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436 return Token.OP_AND_ASSIGN;
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438 return Token.BITWISE_AND;
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444 return Token.OP_OR;
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445 } else if (d == '='){
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447 return Token.OP_OR_ASSIGN;
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449 return Token.BITWISE_OR;
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455 return Token.OP_MULT_ASSIGN;
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463 return Token.OP_DIV_ASSIGN;
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471 return Token.OP_MOD_ASSIGN;
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473 return Token.PERCENT;
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479 return Token.OP_XOR_ASSIGN;
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481 return Token.CARRET;
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491 return Token.OP_SHIFT_LEFT_ASSIGN;
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493 return Token.OP_SHIFT_LEFT;
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494 } else if (d == '='){
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496 return Token.OP_LE;
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498 return Token.OP_LT;
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508 return Token.OP_SHIFT_RIGHT_ASSIGN;
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510 return Token.OP_SHIFT_RIGHT;
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511 } else if (d == '='){
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513 return Token.OP_GE;
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515 return Token.OP_GT;
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517 return Token.ERROR;
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520 bool decimal_digits (int c)
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523 bool seen_digits = false;
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526 number_builder.Append ((char) c);
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528 while ((d = peekChar ()) != -1){
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529 if (Char.IsDigit ((char)d)){
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530 number_builder.Append ((char) d);
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532 seen_digits = true;
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537 return seen_digits;
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540 bool is_hex (char e)
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542 return Char.IsDigit (e) || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');
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545 void hex_digits (int c)
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550 number_builder.Append ((char) c);
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551 while ((d = peekChar ()) != -1){
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552 char e = Char.ToUpper ((char) d);
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555 number_builder.Append ((char) e);
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562 int real_type_suffix (int c)
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567 case 'F': case 'f':
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568 t = Token.LITERAL_FLOAT;
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570 case 'D': case 'd':
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571 t = Token.LITERAL_DOUBLE;
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573 case 'M': case 'm':
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574 t= Token.LITERAL_DECIMAL;
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582 int integer_type_suffix (ulong ul, int c)
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584 bool is_unsigned = false;
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585 bool is_long = false;
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588 bool scanning = true;
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591 case 'U': case 'u':
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594 is_unsigned = true;
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601 // if we have not seen anything in between
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602 // report this error
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606 "the 'l' suffix is easily confused with digit `1'," +
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607 " use 'L' for clarity");
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623 } while (scanning);
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626 if (is_long && is_unsigned){
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628 return Token.LITERAL_INTEGER;
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629 } else if (is_unsigned){
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630 // uint if possible, or ulong else.
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632 if ((ul & 0xffffffff00000000) == 0)
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636 } else if (is_long){
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637 // long if possible, ulong otherwise
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638 if ((ul & 0x8000000000000000) != 0)
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643 // int, uint, long or ulong in that order
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644 if ((ul & 0xffffffff00000000) == 0){
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645 uint ui = (uint) ul;
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647 if ((ui & 0x80000000) != 0)
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652 if ((ul & 0x8000000000000000) != 0)
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658 return Token.LITERAL_INTEGER;
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662 // given `c' as the next char in the input decide whether
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663 // we need to convert to a special type, and then choose
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664 // the best representation for the integer
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666 int adjust_int (int c)
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669 ulong ul = System.UInt64.Parse (number_builder.ToString ());
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670 return integer_type_suffix (ul, c);
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671 } catch (OverflowException) {
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672 error_details = "Integral constant is too large";
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673 Report.Error (1021, Location, error_details);
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675 return Token.LITERAL_INTEGER;
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679 int adjust_real (int t)
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681 string s = number_builder.ToString ();
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684 case Token.LITERAL_DECIMAL:
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686 val = System.Decimal.Parse (s, styles, csharp_format_info);
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687 } catch (OverflowException) {
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689 error_details = "Floating-point constant is outside the range of the type 'decimal'";
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690 Report.Error(594, Location, error_details);
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693 case Token.LITERAL_FLOAT:
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695 val = (float) System.Double.Parse (s, styles, csharp_format_info);
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696 } catch (OverflowException) {
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698 error_details = "Floating-point constant is outside the range of the type 'float'";
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699 Report.Error(594, Location, error_details);
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703 case Token.LITERAL_DOUBLE:
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705 t = Token.LITERAL_DOUBLE;
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707 val = System.Double.Parse (s, styles, csharp_format_info);
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708 } catch (OverflowException) {
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710 error_details = "Floating-point constant is outside the range of the type 'double'";
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711 Report.Error(594, Location, error_details);
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719 // Invoked if we know we have .digits or digits
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721 int is_number (int c)
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723 bool is_real = false;
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726 number_builder.Length = 0;
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728 if (Char.IsDigit ((char)c)){
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729 if (c == '0' && peekChar () == 'x' || peekChar () == 'X'){
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734 string s = number_builder.ToString ();
\r
736 ul = System.UInt64.Parse (s, NumberStyles.HexNumber);
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737 return integer_type_suffix (ul, peekChar ());
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739 decimal_digits (c);
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744 // We need to handle the case of
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745 // "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)
\r
748 if (decimal_digits ('.')){
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753 number_builder.Length -= 1;
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754 return adjust_int (-1);
\r
758 if (c == 'e' || c == 'E'){
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760 number_builder.Append ("e");
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764 number_builder.Append ((char) c);
\r
766 number_builder.Append ((char) c);
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767 decimal_digits (-1);
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771 type = real_type_suffix (c);
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772 if (type == Token.NONE && !is_real){
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774 return adjust_int (c);
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778 if (type == Token.NONE){
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783 return adjust_real (type);
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785 Console.WriteLine ("This should not be reached");
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786 throw new Exception ("Is Number should never reach this point");
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790 // Accepts exactly count (4 or 8) hex, no more no less
\r
792 int getHex (int count, out bool error)
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794 int [] buffer = new int [8];
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799 int top = count != -1 ? count : 4;
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803 for (i = 0; i < top; i++){
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805 e = Char.ToUpper ((char) c);
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811 if (Char.IsDigit (e))
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812 c = (int) e - (int) '0';
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814 c = (int) e - (int) 'A' + 10;
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815 total = (total * 16) + c;
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817 int p = peekChar ();
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820 if (!is_hex ((char)p))
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861 v = getHex (-1, out error);
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866 v = getHex (4, out error);
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871 v = getHex (8, out error);
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876 Report.Error (1009, Location, "Unrecognized escape sequence in " + (char)d);
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885 if (putback_char != -1){
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886 int x = putback_char;
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891 return reader.Read ();
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896 if (putback_char != -1)
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897 return putback_char;
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898 return reader.Peek ();
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901 void putback (int c)
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903 if (putback_char != -1)
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904 throw new Exception ("This should not happen putback on putback");
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908 public bool advance ()
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910 return peekChar () != -1;
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913 public Object Value {
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919 public Object value ()
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924 public int token ()
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926 current_token = xtoken ();
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927 return current_token;
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930 static StringBuilder static_cmd_arg = new System.Text.StringBuilder ();
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932 void get_cmd_arg (out string cmd, out string arg)
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936 tokens_seen = false;
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938 static_cmd_arg.Length = 0;
\r
940 while ((c = getChar ()) != -1 && (c != '\n') && (c != ' ') && (c != '\t')){
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943 static_cmd_arg.Append ((char) c);
\r
946 cmd = static_cmd_arg.ToString ();
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954 // skip over white space
\r
955 while ((c = getChar ()) != -1 && (c != '\n') && ((c == ' ') || (c == '\t')))
\r
964 static_cmd_arg.Length = 0;
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965 static_cmd_arg.Append ((char) c);
\r
967 while ((c = getChar ()) != -1 && (c != '\n')){
\r
970 static_cmd_arg.Append ((char) c);
\r
977 arg = static_cmd_arg.ToString ().Trim ();
\r
981 // Handles the #line directive
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983 bool PreProcessLine (string arg)
\r
988 if (arg == "default"){
\r
989 line = ref_line = line;
\r
996 if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){
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997 ref_line = System.Int32.Parse (arg.Substring (0, pos));
\r
1000 char [] quotes = { '\"' };
\r
1002 ref_name = arg.Substring (pos). Trim(quotes);
\r
1004 ref_line = System.Int32.Parse (arg);
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1014 // Handles #define and #undef
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1016 void PreProcessDefinition (bool is_define, string arg)
\r
1018 if (arg == "" || arg == "true" || arg == "false"){
\r
1019 Report.Error(1001, Location, "Missing identifer to pre-processor directive");
\r
1023 char[] whitespace = { ' ', '\t' };
\r
1024 if (arg.IndexOfAny (whitespace) != -1){
\r
1025 Report.Error(1025, Location, "Single-line comment or end-of-line expected");
\r
1029 foreach (char c in arg){
\r
1030 if (!Char.IsLetter (c) && (c != '_')){
\r
1031 Report.Error(1001, Location, "Identifier expected");
\r
1037 if (defines == null)
\r
1038 defines = new Hashtable ();
\r
1041 if (defines == null)
\r
1043 if (defines.Contains (arg))
\r
1044 defines.Remove (arg);
\r
1048 bool eval_val (string s)
\r
1055 if (defines == null)
\r
1057 if (defines.Contains (s))
\r
1063 bool pp_primary (ref string s)
\r
1066 int len = s.Length;
\r
1072 s = s.Substring (1);
\r
1073 bool val = pp_expr (ref s);
\r
1074 if (s.Length > 0 && s [0] == ')'){
\r
1075 s = s.Substring (1);
\r
1078 Error_InvalidDirective ();
\r
1082 if (is_identifier_start_character(c)){
\r
1088 if (is_identifier_part_character(c)){
\r
1092 bool v = eval_val (s.Substring (0, j));
\r
1093 s = s.Substring (j);
\r
1096 bool vv = eval_val (s);
\r
1101 Error_InvalidDirective ();
\r
1105 bool pp_unary (ref string s)
\r
1108 int len = s.Length;
\r
1111 if (s [0] == '!'){
\r
1112 if (len > 1 && s [1] == '='){
\r
1113 Error_InvalidDirective ();
\r
1116 s = s.Substring (1);
\r
1117 return ! pp_primary (ref s);
\r
1119 return pp_primary (ref s);
\r
1121 Error_InvalidDirective ();
\r
1126 bool pp_eq (ref string s)
\r
1128 bool va = pp_unary (ref s);
\r
1131 int len = s.Length;
\r
1133 if (s [0] == '='){
\r
1134 if (len > 2 && s [1] == '='){
\r
1135 s = s.Substring (2);
\r
1136 return va == pp_unary (ref s);
\r
1138 Error_InvalidDirective ();
\r
1141 } else if (s [0] == '!' && len > 1 && s [1] == '='){
\r
1142 s = s.Substring (2);
\r
1144 return va != pp_unary (ref s);
\r
1153 bool pp_and (ref string s)
\r
1155 bool va = pp_eq (ref s);
\r
1158 int len = s.Length;
\r
1160 if (s [0] == '&'){
\r
1161 if (len > 2 && s [1] == '&'){
\r
1162 s = s.Substring (2);
\r
1163 return va && pp_eq (ref s);
\r
1165 Error_InvalidDirective ();
\r
1174 // Evaluates an expression for `#if' or `#elif'
\r
1176 bool pp_expr (ref string s)
\r
1178 bool va = pp_and (ref s);
\r
1181 int len = s.Length;
\r
1186 if (len > 2 && s [1] == '|'){
\r
1187 s = s.Substring (2);
\r
1188 return va || pp_and (ref s);
\r
1190 Error_InvalidDirective ();
\r
1199 bool eval (string s)
\r
1201 bool v = pp_expr (ref s);
\r
1203 if (s.Length != 0){
\r
1204 Error_InvalidDirective ();
\r
1211 void Error_InvalidDirective ()
\r
1213 Report.Error (1517, Location, "Invalid pre-processor directive");
\r
1216 void Error_UnexpectedDirective (string extra)
\r
1220 "Unexpected processor directive (" + extra + ")");
\r
1223 void Error_TokensSeen ()
\r
1227 "Cannot define or undefine pre-processor symbols after a token in the file");
\r
1231 // if true, then the code continues processing the code
\r
1232 // if false, the code stays in a loop until another directive is
\r
1235 bool handle_preprocessing_directive (bool caller_is_taking)
\r
1237 char [] blank = { ' ', '\t' };
\r
1240 get_cmd_arg (out cmd, out arg);
\r
1242 // Eat any trailing whitespaces and single-line comments
\r
1243 if (arg.IndexOf ("//") != -1)
\r
1244 arg = arg.Substring (0, arg.IndexOf ("//"));
\r
1245 arg = arg.TrimEnd (' ', '\t');
\r
1248 // The first group of pre-processing instructions is always processed
\r
1252 if (!PreProcessLine (arg))
\r
1255 "Argument to #line directive is missing or invalid");
\r
1263 goto case "endif";
\r
1267 Error_InvalidDirective ();
\r
1270 bool taking = false;
\r
1271 if (ifstack == null)
\r
1272 ifstack = new Stack ();
\r
1274 if (ifstack.Count == 0){
\r
1277 int state = (int) ifstack.Peek ();
\r
1278 if ((state & TAKING) != 0)
\r
1282 if (eval (arg) && taking){
\r
1283 ifstack.Push (TAKING | TAKEN_BEFORE | PARENT_TAKING);
\r
1286 ifstack.Push (taking ? PARENT_TAKING : 0);
\r
1291 if (ifstack == null || ifstack.Count == 0){
\r
1292 Error_UnexpectedDirective ("no #if for this #endif");
\r
1296 if (ifstack.Count == 0)
\r
1299 int state = (int) ifstack.Peek ();
\r
1301 if ((state & TAKING) != 0)
\r
1309 if (ifstack == null || ifstack.Count == 0){
\r
1310 Error_UnexpectedDirective ("no #if for this #elif");
\r
1313 int state = (int) ifstack.Peek ();
\r
1315 if ((state & ELSE_SEEN) != 0){
\r
1316 Error_UnexpectedDirective ("#elif not valid after #else");
\r
1320 if ((state & (TAKEN_BEFORE | TAKING)) != 0)
\r
1323 if (eval (arg) && ((state & PARENT_TAKING) != 0)){
\r
1324 state = (int) ifstack.Pop ();
\r
1325 ifstack.Push (state | TAKING | TAKEN_BEFORE);
\r
1332 if (ifstack == null || ifstack.Count == 0){
\r
1335 "Unexpected processor directive (no #if for this #else)");
\r
1338 int state = (int) ifstack.Peek ();
\r
1340 if ((state & ELSE_SEEN) != 0){
\r
1341 Error_UnexpectedDirective ("#else within #else");
\r
1346 ifstack.Push (state | ELSE_SEEN);
\r
1348 if ((state & TAKEN_BEFORE) == 0){
\r
1349 if ((state & PARENT_TAKING) != 0)
\r
1359 // These are only processed if we are in a `taking' block
\r
1361 if (!caller_is_taking)
\r
1366 if (any_token_seen){
\r
1367 Error_TokensSeen ();
\r
1370 PreProcessDefinition (true, arg);
\r
1374 if (any_token_seen){
\r
1375 Error_TokensSeen ();
\r
1378 PreProcessDefinition (false, arg);
\r
1382 Report.Error (1029, Location, "#error: '" + arg + "'");
\r
1386 Report.Warning (1030, Location, "#warning: '" + arg + "'");
\r
1390 Report.Error (1024, Location, "Preprocessor directive expected (got: " + cmd + ")");
\r
1395 private int consume_string(bool quoted)
\r
1398 string_builder.Length = 0;
\r
1400 while ((c = getChar ()) != -1){
\r
1402 if (quoted && peekChar () == '"'){
\r
1403 string_builder.Append ((char) c);
\r
1407 val = string_builder.ToString ();
\r
1408 return Token.LITERAL_STRING;
\r
1412 if (c == '\n' && !quoted) {
\r
1413 Report.Error(1010, Location, "Newline in constant");
\r
1419 return Token.ERROR;
\r
1421 string_builder.Append ((char) c);
\r
1424 Report.Error (1039, Location, "Unterminated string literal");
\r
1428 private int consume_identifier(int c, bool quoted)
\r
1430 id_builder.Length = 0;
\r
1432 id_builder.Append ((char) c);
\r
1434 while ((c = peekChar ()) != -1) {
\r
1435 if (is_identifier_part_character ((char) c)){
\r
1436 id_builder.Append ((char)getChar ());
\r
1442 string ids = id_builder.ToString ();
\r
1444 if (!is_keyword (ids) || quoted) {
\r
1446 if (ids.Length > 512){
\r
1449 "Identifier too long (limit is 512 chars)");
\r
1451 return Token.IDENTIFIER;
\r
1454 // true, false and null are in the hash anyway.
\r
1455 return GetKeyword (ids);
\r
1458 public int xtoken ()
\r
1461 bool doread = false;
\r
1465 // optimization: eliminate col and implement #directive semantic correctly.
\r
1466 for (;(c = getChar ()) != -1; col++) {
\r
1467 if (is_identifier_start_character((char)c)){
\r
1468 tokens_seen = true;
\r
1469 return consume_identifier(c, false);
\r
1473 tokens_seen = true;
\r
1474 if (Char.IsDigit ((char) peekChar ()))
\r
1475 return is_number (c);
\r
1479 if (Char.IsDigit ((char) c)){
\r
1480 tokens_seen = true;
\r
1481 return is_number (c);
\r
1484 // Handle double-slash comments.
\r
1486 int d = peekChar ();
\r
1490 while ((d = getChar ()) != -1 && (d != '\n'))
\r
1495 any_token_seen |= tokens_seen;
\r
1496 tokens_seen = false;
\r
1498 } else if (d == '*'){
\r
1501 while ((d = getChar ()) != -1){
\r
1502 if (d == '*' && peekChar () == '/'){
\r
1511 any_token_seen |= tokens_seen;
\r
1512 tokens_seen = false;
\r
1519 /* For now, ignore pre-processor commands */
\r
1520 // FIXME: In C# the '#' is not limited to appear
\r
1521 // on the first column.
\r
1522 if (c == '#' && !tokens_seen){
\r
1527 cont = handle_preprocessing_directive (cont);
\r
1535 bool skipping = false;
\r
1536 for (;(c = getChar ()) != -1; col++){
\r
1542 } else if (c == ' ' || c == '\t' || c == '\v' || c == '\r')
\r
1544 else if (c != '#')
\r
1546 if (c == '#' && !skipping)
\r
1549 any_token_seen |= tokens_seen;
\r
1550 tokens_seen = false;
\r
1552 Report.Error (1027, Location, "#endif/#endregion expected");
\r
1556 if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){
\r
1557 tokens_seen = true;
\r
1566 return consume_string(false);
\r
1571 tokens_seen = true;
\r
1573 error_details = "Empty character literal";
\r
1574 Report.Error (1011, Location, error_details);
\r
1575 return Token.ERROR;
\r
1579 return Token.ERROR;
\r
1580 val = new System.Char ();
\r
1585 error_details = "Too many characters in character literal";
\r
1586 Report.Error (1012, Location, error_details);
\r
1588 // Try to recover, read until newline or next "'"
\r
1589 while ((c = getChar ()) != -1){
\r
1590 if (c == '\n' || c == '\'')
\r
1594 return Token.ERROR;
\r
1596 return Token.LITERAL_CHARACTER;
\r
1604 any_token_seen |= tokens_seen;
\r
1605 tokens_seen = false;
\r
1609 if (c == ' ' || c == '\t' || c == '\f' || c == '\v' || c == '\r'){
\r
1611 col = (((col + 8) / 8) * 8) - 1;
\r
1618 tokens_seen = true;
\r
1619 return consume_string(true);
\r
1620 } else if (is_identifier_start_character((char) c)){
\r
1621 return consume_identifier(c, true);
\r
1623 Report.Error(1033, Location, "'@' must be followed by string constant or identifier");
\r
1627 error_details = ((char)c).ToString ();
\r
1629 return Token.ERROR;
\r
1632 if (ifstack != null && ifstack.Count >= 1)
\r
1633 Report.Error (1027, Location, "#endif/#endregion expected");
\r