//
// cs-tokenizer.cs: The Tokenizer for the C# compiler
// This also implements the preprocessor
//
// Author: Miguel de Icaza (miguel@gnu.org)
// Marek Safar (marek.safar@seznam.cz)
//
// Licensed under the terms of the GNU GPL
//
// (C) 2001, 2002 Ximian, Inc (http://www.ximian.com)
// (C) 2004 Novell, Inc
//
//
using System;
using System.Text;
using System.Collections;
using System.IO;
using System.Globalization;
using System.Reflection;
namespace Mono.CSharp
{
///
/// Tokenizer for C# source code.
///
public class Tokenizer : yyParser.yyInput
{
SeekableStreamReader reader;
SourceFile ref_name;
SourceFile file_name;
int ref_line = 1;
int line = 1;
int col = 0;
int previous_col;
int current_token;
bool handle_get_set = false;
bool handle_remove_add = false;
bool handle_assembly = false;
bool handle_where = false;
bool handle_typeof = false;
bool lambda_arguments_parsing;
Location current_location;
Location current_comment_location = Location.Null;
ArrayList escaped_identifiers = new ArrayList ();
public int parsing_block;
#if GMCS_SOURCE
bool query_parsing;
#endif
static bool IsLinqEnabled {
get {
return RootContext.Version == LanguageVersion.LINQ;
}
}
//
// XML documentation buffer. The save point is used to divide
// comments on types and comments on members.
//
StringBuilder xml_comment_buffer;
//
// See comment on XmlCommentState enumeration.
//
XmlCommentState xml_doc_state = XmlCommentState.Allowed;
//
// Whether tokens have been seen on this line
//
bool tokens_seen = false;
//
// Whether a token has been seen on the file
// This is needed because `define' is not allowed to be used
// after a token has been seen.
//
bool any_token_seen = false;
static Hashtable token_values;
static readonly char[] simple_whitespaces = new char[] { ' ', '\t' };
private static Hashtable TokenValueName
{
get {
if (token_values == null)
token_values = GetTokenValueNameHash ();
return token_values;
}
}
private static Hashtable GetTokenValueNameHash ()
{
Type t = typeof (Token);
FieldInfo [] fields = t.GetFields ();
Hashtable hash = new Hashtable ();
foreach (FieldInfo field in fields) {
if (field.IsLiteral && field.IsStatic && field.FieldType == typeof (int))
hash.Add (field.GetValue (null), field.Name);
}
return hash;
}
//
// Returns a verbose representation of the current location
//
public string location {
get {
string det;
if (current_token == Token.ERROR)
det = "detail: " + error_details;
else
det = "";
// return "Line: "+line+" Col: "+col + "\n" +
// "VirtLine: "+ref_line +
// " Token: "+current_token + " " + det;
string current_token_name = TokenValueName [current_token] as string;
if (current_token_name == null)
current_token_name = current_token.ToString ();
return String.Format ("{0} ({1},{2}), Token: {3} {4}", ref_name.Name,
ref_line,
col,
current_token_name,
det);
}
}
public bool PropertyParsing {
get { return handle_get_set; }
set { handle_get_set = value; }
}
public bool AssemblyTargetParsing {
get { return handle_assembly; }
set { handle_assembly = value; }
}
public bool EventParsing {
get { return handle_remove_add; }
set { handle_remove_add = value; }
}
public bool ConstraintsParsing {
get { return handle_where; }
set { handle_where = value; }
}
public bool TypeOfParsing {
get { return handle_typeof; }
set { handle_typeof = value; }
}
public XmlCommentState doc_state {
get { return xml_doc_state; }
set {
if (value == XmlCommentState.Allowed) {
check_incorrect_doc_comment ();
reset_doc_comment ();
}
xml_doc_state = value;
}
}
public bool IsEscapedIdentifier (Location loc)
{
foreach (LocatedToken lt in escaped_identifiers)
if (lt.Location.Equals (loc))
return true;
return false;
}
//
// Class variables
//
static CharArrayHashtable[] keywords;
static Hashtable keyword_strings;
static NumberStyles styles;
static NumberFormatInfo csharp_format_info;
//
// Values for the associated token returned
//
int putback_char;
Object val;
//
// Pre-processor
//
Hashtable defines;
const int TAKING = 1;
const int ELSE_SEEN = 4;
const int PARENT_TAKING = 8;
const int REGION = 16;
//
// pre-processor if stack state:
//
Stack ifstack;
static System.Text.StringBuilder string_builder;
const int max_id_size = 512;
static char [] id_builder = new char [max_id_size];
static CharArrayHashtable [] identifiers = new CharArrayHashtable [max_id_size + 1];
const int max_number_size = 512;
static char [] number_builder = new char [max_number_size];
static int number_pos;
//
// Details about the error encoutered by the tokenizer
//
string error_details;
public string error {
get {
return error_details;
}
}
public int Line {
get {
return ref_line;
}
}
public int Col {
get {
return col;
}
}
//
// This is used when the tokenizer needs to save
// the current position as it needs to do some parsing
// on its own to deamiguate a token in behalf of the
// parser.
//
Stack position_stack = new Stack (2);
class Position {
public int position;
public int ref_line;
public int col;
public int putback_char;
public int previous_col;
public Stack ifstack;
public int parsing_generic_less_than;
public int current_token;
public Position (Tokenizer t)
{
position = t.reader.Position;
ref_line = t.ref_line;
col = t.col;
putback_char = t.putback_char;
previous_col = t.previous_col;
if (t.ifstack != null && t.ifstack.Count != 0)
ifstack = (Stack)t.ifstack.Clone ();
parsing_generic_less_than = t.parsing_generic_less_than;
current_token = t.current_token;
}
}
public void PushPosition ()
{
position_stack.Push (new Position (this));
}
public void PopPosition ()
{
Position p = (Position) position_stack.Pop ();
reader.Position = p.position;
ref_line = p.ref_line;
col = p.col;
putback_char = p.putback_char;
previous_col = p.previous_col;
ifstack = p.ifstack;
parsing_generic_less_than = p.parsing_generic_less_than;
current_token = p.current_token;
}
// Do not reset the position, ignore it.
public void DiscardPosition ()
{
position_stack.Pop ();
}
static void AddKeyword (string kw, int token)
{
keyword_strings.Add (kw, kw);
if (keywords [kw.Length] == null) {
keywords [kw.Length] = new CharArrayHashtable (kw.Length);
}
keywords [kw.Length] [kw.ToCharArray ()] = token;
}
static void InitTokens ()
{
keyword_strings = new Hashtable ();
keywords = new CharArrayHashtable [64];
AddKeyword ("__arglist", Token.ARGLIST);
AddKeyword ("abstract", Token.ABSTRACT);
AddKeyword ("as", Token.AS);
AddKeyword ("add", Token.ADD);
AddKeyword ("assembly", Token.ASSEMBLY);
AddKeyword ("base", Token.BASE);
AddKeyword ("bool", Token.BOOL);
AddKeyword ("break", Token.BREAK);
AddKeyword ("byte", Token.BYTE);
AddKeyword ("case", Token.CASE);
AddKeyword ("catch", Token.CATCH);
AddKeyword ("char", Token.CHAR);
AddKeyword ("checked", Token.CHECKED);
AddKeyword ("class", Token.CLASS);
AddKeyword ("const", Token.CONST);
AddKeyword ("continue", Token.CONTINUE);
AddKeyword ("decimal", Token.DECIMAL);
AddKeyword ("default", Token.DEFAULT);
AddKeyword ("delegate", Token.DELEGATE);
AddKeyword ("do", Token.DO);
AddKeyword ("double", Token.DOUBLE);
AddKeyword ("else", Token.ELSE);
AddKeyword ("enum", Token.ENUM);
AddKeyword ("event", Token.EVENT);
AddKeyword ("explicit", Token.EXPLICIT);
AddKeyword ("extern", Token.EXTERN);
AddKeyword ("false", Token.FALSE);
AddKeyword ("finally", Token.FINALLY);
AddKeyword ("fixed", Token.FIXED);
AddKeyword ("float", Token.FLOAT);
AddKeyword ("for", Token.FOR);
AddKeyword ("foreach", Token.FOREACH);
AddKeyword ("goto", Token.GOTO);
AddKeyword ("get", Token.GET);
AddKeyword ("if", Token.IF);
AddKeyword ("implicit", Token.IMPLICIT);
AddKeyword ("in", Token.IN);
AddKeyword ("int", Token.INT);
AddKeyword ("interface", Token.INTERFACE);
AddKeyword ("internal", Token.INTERNAL);
AddKeyword ("is", Token.IS);
AddKeyword ("lock", Token.LOCK);
AddKeyword ("long", Token.LONG);
AddKeyword ("namespace", Token.NAMESPACE);
AddKeyword ("new", Token.NEW);
AddKeyword ("null", Token.NULL);
AddKeyword ("object", Token.OBJECT);
AddKeyword ("operator", Token.OPERATOR);
AddKeyword ("out", Token.OUT);
AddKeyword ("override", Token.OVERRIDE);
AddKeyword ("params", Token.PARAMS);
AddKeyword ("private", Token.PRIVATE);
AddKeyword ("protected", Token.PROTECTED);
AddKeyword ("public", Token.PUBLIC);
AddKeyword ("readonly", Token.READONLY);
AddKeyword ("ref", Token.REF);
AddKeyword ("remove", Token.REMOVE);
AddKeyword ("return", Token.RETURN);
AddKeyword ("sbyte", Token.SBYTE);
AddKeyword ("sealed", Token.SEALED);
AddKeyword ("set", Token.SET);
AddKeyword ("short", Token.SHORT);
AddKeyword ("sizeof", Token.SIZEOF);
AddKeyword ("stackalloc", Token.STACKALLOC);
AddKeyword ("static", Token.STATIC);
AddKeyword ("string", Token.STRING);
AddKeyword ("struct", Token.STRUCT);
AddKeyword ("switch", Token.SWITCH);
AddKeyword ("this", Token.THIS);
AddKeyword ("throw", Token.THROW);
AddKeyword ("true", Token.TRUE);
AddKeyword ("try", Token.TRY);
AddKeyword ("typeof", Token.TYPEOF);
AddKeyword ("uint", Token.UINT);
AddKeyword ("ulong", Token.ULONG);
AddKeyword ("unchecked", Token.UNCHECKED);
AddKeyword ("unsafe", Token.UNSAFE);
AddKeyword ("ushort", Token.USHORT);
AddKeyword ("using", Token.USING);
AddKeyword ("virtual", Token.VIRTUAL);
AddKeyword ("void", Token.VOID);
AddKeyword ("volatile", Token.VOLATILE);
AddKeyword ("while", Token.WHILE);
AddKeyword ("partial", Token.PARTIAL);
#if GMCS_SOURCE
AddKeyword ("where", Token.WHERE);
#endif
}
#if GMCS_SOURCE
public static void InitializeLinqKeywords ()
{
AddKeyword ("from", Token.FROM);
AddKeyword ("join", Token.JOIN);
AddKeyword ("on", Token.ON);
AddKeyword ("equals", Token.EQUALS);
AddKeyword ("select", Token.SELECT);
AddKeyword ("group", Token.GROUP);
AddKeyword ("by", Token.BY);
AddKeyword ("let", Token.LET);
AddKeyword ("orderby", Token.ORDERBY);
AddKeyword ("ascending", Token.ASCENDING);
AddKeyword ("descending", Token.DESCENDING);
AddKeyword ("into", Token.INTO);
}
#endif
//
// Class initializer
//
static Tokenizer ()
{
Reset ();
}
public static void Reset ()
{
InitTokens ();
csharp_format_info = NumberFormatInfo.InvariantInfo;
styles = NumberStyles.Float;
string_builder = new System.Text.StringBuilder ();
}
int GetKeyword (char[] id, int id_len)
{
/*
* Keywords are stored in an array of hashtables grouped by their
* length.
*/
if ((id_len >= keywords.Length) || (keywords [id_len] == null))
return -1;
object o = keywords [id_len] [id];
if (o == null)
return -1;
int res = (int) o;
if (!handle_get_set && (res == Token.GET || res == Token.SET))
return -1;
if (!handle_remove_add && (res == Token.REMOVE || res == Token.ADD))
return -1;
if (!handle_assembly && res == Token.ASSEMBLY)
return -1;
#if GMCS_SOURCE
if (IsLinqEnabled) {
//
// A query expression is any expression that starts with `from identifier'
// followed by any token except ; , =
//
if (!query_parsing && res == Token.FROM) {
PushPosition ();
switch (token ()) {
case Token.IDENTIFIER:
case Token.INT:
case Token.BOOL:
case Token.BYTE:
case Token.CHAR:
case Token.DECIMAL:
case Token.FLOAT:
case Token.LONG:
case Token.OBJECT:
case Token.STRING:
case Token.UINT:
case Token.ULONG:
int next_token = token ();
query_parsing = next_token != Token.SEMICOLON && next_token != Token.COMMA &&
next_token != Token.EQUALS;
break;
case Token.VOID:
Expression.Error_VoidInvalidInTheContext (Location);
break;
}
PopPosition ();
}
if (!query_parsing && res > Token.QUERY_FIRST_TOKEN && res < Token.QUERY_LAST_TOKEN)
return -1;
return res;
}
if (!handle_where && res == Token.WHERE)
return -1;
#endif
return res;
}
public Location Location {
get { return current_location; }
}
void define (string def)
{
if (!RootContext.AllDefines.Contains (def)){
RootContext.AllDefines [def] = true;
}
if (defines.Contains (def))
return;
defines [def] = true;
}
public Tokenizer (SeekableStreamReader input, SourceFile file, ArrayList defs)
{
this.ref_name = file;
this.file_name = file;
reader = input;
putback_char = -1;
if (defs != null){
defines = new Hashtable ();
foreach (string def in defs)
define (def);
}
xml_comment_buffer = new StringBuilder ();
//
// FIXME: This could be `Location.Push' but we have to
// find out why the MS compiler allows this
//
Mono.CSharp.Location.Push (file);
}
static bool is_identifier_start_character (char c)
{
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || Char.IsLetter (c);
}
static bool is_identifier_part_character (char c)
{
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || (c >= '0' && c <= '9') ||
Char.IsLetter (c) || Char.GetUnicodeCategory (c) == UnicodeCategory.ConnectorPunctuation;
}
public static bool IsKeyword (string s)
{
return keyword_strings [s] != null;
}
//
// Tests whether '(' is beggining of lambda parameters
//
bool IsLambdaOpenParens ()
{
int ntoken;
while ((ntoken = xtoken ()) != Token.EOF) {
switch (ntoken) {
case Token.CLOSE_PARENS:
return xtoken () == Token.ARROW;
case Token.STAR:
case Token.SEMICOLON:
case Token.OPEN_PARENS:
return false;
}
}
Error_TokenExpected (")");
return false;
}
public static bool IsValidIdentifier (string s)
{
if (s == null || s.Length == 0)
return false;
if (!is_identifier_start_character (s [0]))
return false;
for (int i = 1; i < s.Length; i ++)
if (! is_identifier_part_character (s [i]))
return false;
return true;
}
bool parse_less_than ()
{
start:
int the_token = token ();
if (the_token == Token.OPEN_BRACKET) {
do {
the_token = token ();
} while (the_token != Token.CLOSE_BRACKET);
the_token = token ();
}
switch (the_token) {
case Token.IDENTIFIER:
case Token.OBJECT:
case Token.STRING:
case Token.BOOL:
case Token.DECIMAL:
case Token.FLOAT:
case Token.DOUBLE:
case Token.SBYTE:
case Token.BYTE:
case Token.SHORT:
case Token.USHORT:
case Token.INT:
case Token.UINT:
case Token.LONG:
case Token.ULONG:
case Token.CHAR:
case Token.VOID:
break;
default:
return false;
}
again:
the_token = token ();
if (the_token == Token.OP_GENERICS_GT)
return true;
else if (the_token == Token.COMMA || the_token == Token.DOT || the_token == Token.DOUBLE_COLON)
goto start;
else if (the_token == Token.INTERR || the_token == Token.STAR)
goto again;
else if (the_token == Token.OP_GENERICS_LT) {
if (!parse_less_than ())
return false;
goto again;
} else if (the_token == Token.OPEN_BRACKET) {
rank_specifiers:
the_token = token ();
if (the_token == Token.CLOSE_BRACKET)
goto again;
else if (the_token == Token.COMMA)
goto rank_specifiers;
return false;
}
return false;
}
#if GMCS_SOURCE
public void PutbackNullable ()
{
if (nullable_pos < 0)
throw new Exception ();
current_token = -1;
val = null;
reader.Position = nullable_pos;
putback_char = '?';
}
public void PutbackCloseParens ()
{
putback_char = ')';
}
int nullable_pos = -1;
public void CheckNullable (bool is_nullable)
{
if (is_nullable)
nullable_pos = reader.Position;
else
nullable_pos = -1;
}
public bool QueryParsing {
set {
query_parsing = value;
}
}
bool parse_generic_dimension (out int dimension)
{
dimension = 1;
again:
int the_token = token ();
if (the_token == Token.OP_GENERICS_GT)
return true;
else if (the_token == Token.COMMA) {
dimension++;
goto again;
}
return false;
}
#endif
public int peek_token ()
{
int the_token;
PushPosition ();
the_token = token ();
PopPosition ();
return the_token;
}
int parsing_generic_less_than = 0;
int is_punct (char c, ref bool doread)
{
int d;
int t;
doread = false;
switch (c){
case '{':
val = Location;
return Token.OPEN_BRACE;
case '}':
val = Location;
return Token.CLOSE_BRACE;
case '[':
// To block doccomment inside attribute declaration.
if (doc_state == XmlCommentState.Allowed)
doc_state = XmlCommentState.NotAllowed;
return Token.OPEN_BRACKET;
case ']':
return Token.CLOSE_BRACKET;
case '(':
if (IsLinqEnabled && !lambda_arguments_parsing) {
lambda_arguments_parsing = true;
PushPosition ();
bool lambda_start = IsLambdaOpenParens ();
PopPosition ();
lambda_arguments_parsing = false;
if (lambda_start)
return Token.OPEN_PARENS_LAMBDA;
}
return Token.OPEN_PARENS;
case ')': {
if (deambiguate_close_parens == 0)
return Token.CLOSE_PARENS;
--deambiguate_close_parens;
PushPosition ();
int new_token = xtoken ();
PopPosition ();
if (new_token == Token.OPEN_PARENS)
return Token.CLOSE_PARENS_OPEN_PARENS;
else if (new_token == Token.MINUS)
return Token.CLOSE_PARENS_MINUS;
else if (IsCastToken (new_token))
return Token.CLOSE_PARENS_CAST;
else
return Token.CLOSE_PARENS_NO_CAST;
}
case ',':
return Token.COMMA;
case ';':
val = Location;
return Token.SEMICOLON;
case '~':
val = Location;
return Token.TILDE;
case '?':
#if GMCS_SOURCE
d = peek_char ();
if (d == '?') {
get_char ();
return Token.OP_COALESCING;
}
#endif
return Token.INTERR;
}
#if GMCS_SOURCE
if (c == '<') {
if (parsing_generic_less_than++ > 0)
return Token.OP_GENERICS_LT;
if (handle_typeof) {
int dimension;
PushPosition ();
if (parse_generic_dimension (out dimension)) {
val = dimension;
DiscardPosition ();
return Token.GENERIC_DIMENSION;
}
PopPosition ();
}
// Save current position and parse next token.
PushPosition ();
bool is_generic_lt = parse_less_than ();
PopPosition ();
if (is_generic_lt) {
return Token.OP_GENERICS_LT;
} else
parsing_generic_less_than = 0;
d = peek_char ();
if (d == '<'){
get_char ();
d = peek_char ();
if (d == '='){
doread = true;
return Token.OP_SHIFT_LEFT_ASSIGN;
}
return Token.OP_SHIFT_LEFT;
} else if (d == '='){
doread = true;
return Token.OP_LE;
}
return Token.OP_LT;
} else if (c == '>') {
if (parsing_generic_less_than > 0) {
parsing_generic_less_than--;
return Token.OP_GENERICS_GT;
}
d = peek_char ();
if (d == '>'){
get_char ();
d = peek_char ();
if (d == '='){
doread = true;
return Token.OP_SHIFT_RIGHT_ASSIGN;
}
return Token.OP_SHIFT_RIGHT;
} else if (d == '='){
doread = true;
return Token.OP_GE;
}
return Token.OP_GT;
}
#endif
d = peek_char ();
if (c == '+'){
if (d == '+') {
val = Location;
t = Token.OP_INC;
}
else if (d == '=')
t = Token.OP_ADD_ASSIGN;
else {
val = Location;
return Token.PLUS;
}
doread = true;
return t;
}
if (c == '-'){
if (d == '-') {
val = Location;
t = Token.OP_DEC;
}
else if (d == '=')
t = Token.OP_SUB_ASSIGN;
else if (d == '>')
t = Token.OP_PTR;
else {
val = Location;
return Token.MINUS;
}
doread = true;
return t;
}
if (c == '!'){
if (d == '='){
doread = true;
return Token.OP_NE;
}
val = Location;
return Token.BANG;
}
if (c == '='){
if (d == '='){
doread = true;
return Token.OP_EQ;
}
if (d == '>'){
doread = true;
val = Location;
return Token.ARROW;
}
return Token.ASSIGN;
}
if (c == '&'){
if (d == '&'){
doread = true;
return Token.OP_AND;
} else if (d == '='){
doread = true;
return Token.OP_AND_ASSIGN;
}
val = Location;
return Token.BITWISE_AND;
}
if (c == '|'){
if (d == '|'){
doread = true;
return Token.OP_OR;
} else if (d == '='){
doread = true;
return Token.OP_OR_ASSIGN;
}
return Token.BITWISE_OR;
}
if (c == '*'){
if (d == '='){
doread = true;
return Token.OP_MULT_ASSIGN;
}
val = Location;
return Token.STAR;
}
if (c == '/'){
if (d == '='){
doread = true;
return Token.OP_DIV_ASSIGN;
}
return Token.DIV;
}
if (c == '%'){
if (d == '='){
doread = true;
return Token.OP_MOD_ASSIGN;
}
return Token.PERCENT;
}
if (c == '^'){
if (d == '='){
doread = true;
return Token.OP_XOR_ASSIGN;
}
return Token.CARRET;
}
#if !GMCS_SOURCE
if (c == '<'){
if (d == '<'){
get_char ();
d = peek_char ();
if (d == '='){
doread = true;
return Token.OP_SHIFT_LEFT_ASSIGN;
}
return Token.OP_SHIFT_LEFT;
} else if (d == '='){
doread = true;
return Token.OP_LE;
}
return Token.OP_LT;
}
if (c == '>'){
if (d == '>'){
get_char ();
d = peek_char ();
if (d == '='){
doread = true;
return Token.OP_SHIFT_RIGHT_ASSIGN;
}
return Token.OP_SHIFT_RIGHT;
} else if (d == '='){
doread = true;
return Token.OP_GE;
}
return Token.OP_GT;
}
#endif
if (c == ':'){
if (d == ':'){
doread = true;
return Token.DOUBLE_COLON;
}
val = Location;
return Token.COLON;
}
return Token.ERROR;
}
int deambiguate_close_parens = 0;
public void Deambiguate_CloseParens (object expression)
{
putback (')');
// When any binary operation is used we are sure it is not a cast
if (expression is Binary)
return;
deambiguate_close_parens++;
}
bool decimal_digits (int c)
{
int d;
bool seen_digits = false;
if (c != -1){
if (number_pos == max_number_size)
Error_NumericConstantTooLong ();
number_builder [number_pos++] = (char) c;
}
//
// We use peek_char2, because decimal_digits needs to do a
// 2-character look-ahead (5.ToString for example).
//
while ((d = peek_char2 ()) != -1){
if (d >= '0' && d <= '9'){
if (number_pos == max_number_size)
Error_NumericConstantTooLong ();
number_builder [number_pos++] = (char) d;
get_char ();
seen_digits = true;
} else
break;
}
return seen_digits;
}
static bool is_hex (int e)
{
return (e >= '0' && e <= '9') || (e >= 'A' && e <= 'F') || (e >= 'a' && e <= 'f');
}
static int real_type_suffix (int c)
{
int t;
switch (c){
case 'F': case 'f':
t = Token.LITERAL_FLOAT;
break;
case 'D': case 'd':
t = Token.LITERAL_DOUBLE;
break;
case 'M': case 'm':
t= Token.LITERAL_DECIMAL;
break;
default:
return Token.NONE;
}
return t;
}
int integer_type_suffix (ulong ul, int c)
{
bool is_unsigned = false;
bool is_long = false;
if (c != -1){
bool scanning = true;
do {
switch (c){
case 'U': case 'u':
if (is_unsigned)
scanning = false;
is_unsigned = true;
get_char ();
break;
case 'l':
if (!is_unsigned){
//
// if we have not seen anything in between
// report this error
//
Report.Warning (78, 4, Location, "The 'l' suffix is easily confused with the digit '1' (use 'L' for clarity)");
}
//
// This goto statement causes the MS CLR 2.0 beta 1 csc to report an error, so
// work around that.
//
//goto case 'L';
if (is_long)
scanning = false;
is_long = true;
get_char ();
break;
case 'L':
if (is_long)
scanning = false;
is_long = true;
get_char ();
break;
default:
scanning = false;
break;
}
c = peek_char ();
} while (scanning);
}
if (is_long && is_unsigned){
val = ul;
return Token.LITERAL_INTEGER;
} else if (is_unsigned){
// uint if possible, or ulong else.
if ((ul & 0xffffffff00000000) == 0)
val = (uint) ul;
else
val = ul;
} else if (is_long){
// long if possible, ulong otherwise
if ((ul & 0x8000000000000000) != 0)
val = ul;
else
val = (long) ul;
} else {
// int, uint, long or ulong in that order
if ((ul & 0xffffffff00000000) == 0){
uint ui = (uint) ul;
if ((ui & 0x80000000) != 0)
val = ui;
else
val = (int) ui;
} else {
if ((ul & 0x8000000000000000) != 0)
val = ul;
else
val = (long) ul;
}
}
return Token.LITERAL_INTEGER;
}
//
// given `c' as the next char in the input decide whether
// we need to convert to a special type, and then choose
// the best representation for the integer
//
int adjust_int (int c)
{
try {
if (number_pos > 9){
ulong ul = (uint) (number_builder [0] - '0');
for (int i = 1; i < number_pos; i++){
ul = checked ((ul * 10) + ((uint)(number_builder [i] - '0')));
}
return integer_type_suffix (ul, c);
} else {
uint ui = (uint) (number_builder [0] - '0');
for (int i = 1; i < number_pos; i++){
ui = checked ((ui * 10) + ((uint)(number_builder [i] - '0')));
}
return integer_type_suffix (ui, c);
}
} catch (OverflowException) {
error_details = "Integral constant is too large";
Report.Error (1021, Location, error_details);
val = 0ul;
return Token.LITERAL_INTEGER;
}
catch (FormatException) {
Report.Error (1013, Location, "Invalid number");
val = 0ul;
return Token.LITERAL_INTEGER;
}
}
int adjust_real (int t)
{
string s = new String (number_builder, 0, number_pos);
const string error_details = "Floating-point constant is outside the range of type `{0}'";
switch (t){
case Token.LITERAL_DECIMAL:
try {
val = System.Decimal.Parse (s, styles, csharp_format_info);
} catch (OverflowException) {
val = 0m;
Report.Error (594, Location, error_details, "decimal");
}
break;
case Token.LITERAL_FLOAT:
try {
val = float.Parse (s, styles, csharp_format_info);
} catch (OverflowException) {
val = 0.0f;
Report.Error (594, Location, error_details, "float");
}
break;
case Token.LITERAL_DOUBLE:
case Token.NONE:
t = Token.LITERAL_DOUBLE;
try {
val = System.Double.Parse (s, styles, csharp_format_info);
} catch (OverflowException) {
val = 0.0;
Report.Error (594, Location, error_details, "double");
}
break;
}
return t;
}
int handle_hex ()
{
int d;
ulong ul;
get_char ();
while ((d = peek_char ()) != -1){
if (is_hex (d)){
number_builder [number_pos++] = (char) d;
get_char ();
} else
break;
}
string s = new String (number_builder, 0, number_pos);
try {
if (number_pos <= 8)
ul = System.UInt32.Parse (s, NumberStyles.HexNumber);
else
ul = System.UInt64.Parse (s, NumberStyles.HexNumber);
} catch (OverflowException){
error_details = "Integral constant is too large";
Report.Error (1021, Location, error_details);
val = 0ul;
return Token.LITERAL_INTEGER;
}
catch (FormatException) {
Report.Error (1013, Location, "Invalid number");
val = 0ul;
return Token.LITERAL_INTEGER;
}
return integer_type_suffix (ul, peek_char ());
}
//
// Invoked if we know we have .digits or digits
//
int is_number (int c)
{
bool is_real = false;
int type;
number_pos = 0;
if (c >= '0' && c <= '9'){
if (c == '0'){
int peek = peek_char ();
if (peek == 'x' || peek == 'X')
return handle_hex ();
}
decimal_digits (c);
c = get_char ();
}
//
// We need to handle the case of
// "1.1" vs "1.string" (LITERAL_FLOAT vs NUMBER DOT IDENTIFIER)
//
if (c == '.'){
if (decimal_digits ('.')){
is_real = true;
c = get_char ();
} else {
putback ('.');
number_pos--;
return adjust_int (-1);
}
}
if (c == 'e' || c == 'E'){
is_real = true;
if (number_pos == max_number_size)
Error_NumericConstantTooLong ();
number_builder [number_pos++] = 'e';
c = get_char ();
if (c == '+'){
if (number_pos == max_number_size)
Error_NumericConstantTooLong ();
number_builder [number_pos++] = '+';
c = -1;
} else if (c == '-') {
if (number_pos == max_number_size)
Error_NumericConstantTooLong ();
number_builder [number_pos++] = '-';
c = -1;
} else {
if (number_pos == max_number_size)
Error_NumericConstantTooLong ();
number_builder [number_pos++] = '+';
}
decimal_digits (c);
c = get_char ();
}
type = real_type_suffix (c);
if (type == Token.NONE && !is_real){
putback (c);
return adjust_int (c);
} else
is_real = true;
if (type == Token.NONE){
putback (c);
}
if (is_real)
return adjust_real (type);
Console.WriteLine ("This should not be reached");
throw new Exception ("Is Number should never reach this point");
}
//
// Accepts exactly count (4 or 8) hex, no more no less
//
int getHex (int count, out bool error)
{
int i;
int total = 0;
int c;
int top = count != -1 ? count : 4;
get_char ();
error = false;
for (i = 0; i < top; i++){
c = get_char ();
if (c >= '0' && c <= '9')
c = (int) c - (int) '0';
else if (c >= 'A' && c <= 'F')
c = (int) c - (int) 'A' + 10;
else if (c >= 'a' && c <= 'f')
c = (int) c - (int) 'a' + 10;
else {
error = true;
return 0;
}
total = (total * 16) + c;
if (count == -1){
int p = peek_char ();
if (p == -1)
break;
if (!is_hex ((char)p))
break;
}
}
return total;
}
int escape (int c)
{
bool error;
int d;
int v;
d = peek_char ();
if (c != '\\')
return c;
switch (d){
case 'a':
v = '\a'; break;
case 'b':
v = '\b'; break;
case 'n':
v = '\n'; break;
case 't':
v = '\t'; break;
case 'v':
v = '\v'; break;
case 'r':
v = '\r'; break;
case '\\':
v = '\\'; break;
case 'f':
v = '\f'; break;
case '0':
v = 0; break;
case '"':
v = '"'; break;
case '\'':
v = '\''; break;
case 'x':
v = getHex (-1, out error);
if (error)
goto default;
return v;
case 'u':
v = getHex (4, out error);
if (error)
goto default;
return v;
case 'U':
v = getHex (8, out error);
if (error)
goto default;
return v;
default:
Report.Error (1009, Location, "Unrecognized escape sequence `\\{0}'", ((char)d).ToString ());
return d;
}
get_char ();
return v;
}
int get_char ()
{
int x;
if (putback_char != -1) {
x = putback_char;
putback_char = -1;
} else
x = reader.Read ();
if (x == '\n') {
line++;
ref_line++;
previous_col = col;
col = 0;
}
else
col++;
return x;
}
int peek_char ()
{
if (putback_char != -1)
return putback_char;
putback_char = reader.Read ();
return putback_char;
}
int peek_char2 ()
{
if (putback_char != -1)
return putback_char;
return reader.Peek ();
}
void putback (int c)
{
if (putback_char != -1){
Console.WriteLine ("Col: " + col);
Console.WriteLine ("Row: " + line);
Console.WriteLine ("Name: " + ref_name.Name);
Console.WriteLine ("Current [{0}] putting back [{1}] ", putback_char, c);
throw new Exception ("This should not happen putback on putback");
}
if (c == '\n' || col == 0) {
// It won't happen though.
line--;
ref_line--;
col = previous_col;
}
else
col--;
putback_char = c;
}
public bool advance ()
{
return peek_char () != -1;
}
public Object Value {
get {
return val;
}
}
public Object value ()
{
return val;
}
static bool IsCastToken (int token)
{
switch (token) {
case Token.BANG:
case Token.TILDE:
case Token.IDENTIFIER:
case Token.LITERAL_INTEGER:
case Token.LITERAL_FLOAT:
case Token.LITERAL_DOUBLE:
case Token.LITERAL_DECIMAL:
case Token.LITERAL_CHARACTER:
case Token.LITERAL_STRING:
case Token.BASE:
case Token.CHECKED:
case Token.DELEGATE:
case Token.FALSE:
case Token.FIXED:
case Token.NEW:
case Token.NULL:
case Token.SIZEOF:
case Token.THIS:
case Token.THROW:
case Token.TRUE:
case Token.TYPEOF:
case Token.UNCHECKED:
case Token.UNSAFE:
#if GMCS_SOURCE
case Token.DEFAULT:
#endif
//
// These can be part of a member access
//
case Token.INT:
case Token.UINT:
case Token.SHORT:
case Token.USHORT:
case Token.LONG:
case Token.ULONG:
case Token.DOUBLE:
case Token.FLOAT:
case Token.CHAR:
return true;
default:
return false;
}
}
public int token ()
{
current_token = xtoken ();
#if GMCS_SOURCE
if (current_token != Token.DEFAULT)
return current_token;
PushPosition();
int c = xtoken();
if (c == -1)
current_token = Token.ERROR;
else if (c == Token.OPEN_PARENS)
current_token = Token.DEFAULT_OPEN_PARENS;
else if (c == Token.COLON)
current_token = Token.DEFAULT_COLON;
else
PopPosition();
#endif
return current_token;
}
static StringBuilder static_cmd_arg = new System.Text.StringBuilder ();
void get_cmd_arg (out string cmd, out string arg)
{
int c;
tokens_seen = false;
arg = "";
static_cmd_arg.Length = 0;
// skip over white space
while ((c = get_char ()) != -1 && (c != '\n') && ((c == '\r') || (c == ' ') || (c == '\t')))
;
while ((c != -1) && (c != '\n') && (c != ' ') && (c != '\t') && (c != '\r')){
if (is_identifier_part_character ((char) c)){
static_cmd_arg.Append ((char) c);
c = get_char ();
} else {
putback (c);
break;
}
}
cmd = static_cmd_arg.ToString ();
if (c == '\n' || c == '\r'){
return;
}
// skip over white space
while ((c = get_char ()) != -1 && (c != '\n') && ((c == '\r') || (c == ' ') || (c == '\t')))
;
if (c == '\n'){
return;
} else if (c == '\r'){
return;
} else if (c == -1){
arg = "";
return;
}
static_cmd_arg.Length = 0;
static_cmd_arg.Append ((char) c);
while ((c = get_char ()) != -1 && (c != '\n') && (c != '\r')){
static_cmd_arg.Append ((char) c);
}
arg = static_cmd_arg.ToString ();
}
//
// Handles the #line directive
//
bool PreProcessLine (string arg)
{
if (arg.Length == 0)
return false;
if (arg == "default"){
ref_line = line;
ref_name = file_name;
Location.Push (ref_name);
return true;
} else if (arg == "hidden"){
//
// We ignore #line hidden
//
return true;
}
try {
int pos;
if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){
ref_line = System.Int32.Parse (arg.Substring (0, pos));
pos++;
char [] quotes = { '\"' };
string name = arg.Substring (pos). Trim (quotes);
ref_name = Location.LookupFile (name);
file_name.HasLineDirective = true;
ref_name.HasLineDirective = true;
Location.Push (ref_name);
} else {
ref_line = System.Int32.Parse (arg);
}
} catch {
return false;
}
return true;
}
//
// Handles #define and #undef
//
void PreProcessDefinition (bool is_define, string arg, bool caller_is_taking)
{
if (arg.Length == 0 || arg == "true" || arg == "false"){
Report.Error (1001, Location, "Missing identifer to pre-processor directive");
return;
}
if (arg.IndexOfAny (simple_whitespaces) != -1){
Error_EndLineExpected ();
return;
}
if (!is_identifier_start_character (arg [0]))
Report.Error (1001, Location, "Identifier expected: " + arg);
foreach (char c in arg.Substring (1)){
if (!is_identifier_part_character (c)){
Report.Error (1001, Location, "Identifier expected: " + arg);
return;
}
}
if (!caller_is_taking)
return;
if (is_define){
if (defines == null)
defines = new Hashtable ();
define (arg);
} else {
if (defines == null)
return;
if (defines.Contains (arg))
defines.Remove (arg);
}
}
///
/// Handles #pragma directive
///
void PreProcessPragma (string arg)
{
const string warning = "warning";
const string w_disable = "warning disable";
const string w_restore = "warning restore";
if (arg == w_disable) {
Report.RegisterWarningRegion (Location).WarningDisable (line);
return;
}
if (arg == w_restore) {
Report.RegisterWarningRegion (Location).WarningEnable (line);
return;
}
if (arg.StartsWith (w_disable)) {
int[] codes = ParseNumbers (arg.Substring (w_disable.Length));
foreach (int code in codes) {
if (code != 0)
Report.RegisterWarningRegion (Location).WarningDisable (Location, code);
}
return;
}
if (arg.StartsWith (w_restore)) {
int[] codes = ParseNumbers (arg.Substring (w_restore.Length));
Hashtable w_table = Report.warning_ignore_table;
foreach (int code in codes) {
if (w_table != null && w_table.Contains (code))
Report.Warning (1635, 1, Location, String.Format ("Cannot restore warning `CS{0:0000}' because it was disabled globally", code));
Report.RegisterWarningRegion (Location).WarningEnable (Location, code);
}
return;
}
if (arg.StartsWith (warning)) {
Report.Warning (1634, 1, Location, "Expected disable or restore");
return;
}
Report.Warning (1633, 1, Location, "Unrecognized #pragma directive");
}
int[] ParseNumbers (string text)
{
string[] string_array = text.Split (',');
int[] values = new int [string_array.Length];
int index = 0;
foreach (string string_code in string_array) {
try {
values[index++] = int.Parse (string_code, System.Globalization.CultureInfo.InvariantCulture);
}
catch (FormatException) {
Report.Warning (1692, 1, Location, "Invalid number");
}
}
return values;
}
bool eval_val (string s)
{
if (s == "true")
return true;
if (s == "false")
return false;
if (defines == null)
return false;
if (defines.Contains (s))
return true;
return false;
}
bool pp_primary (ref string s)
{
s = s.Trim ();
int len = s.Length;
if (len > 0){
char c = s [0];
if (c == '('){
s = s.Substring (1);
bool val = pp_expr (ref s, false);
if (s.Length > 0 && s [0] == ')'){
s = s.Substring (1);
return val;
}
Error_InvalidDirective ();
return false;
}
if (is_identifier_start_character (c)){
int j = 1;
while (j < len){
c = s [j];
if (is_identifier_part_character (c)){
j++;
continue;
}
bool v = eval_val (s.Substring (0, j));
s = s.Substring (j);
return v;
}
bool vv = eval_val (s);
s = "";
return vv;
}
}
Error_InvalidDirective ();
return false;
}
bool pp_unary (ref string s)
{
s = s.Trim ();
int len = s.Length;
if (len > 0){
if (s [0] == '!'){
if (len > 1 && s [1] == '='){
Error_InvalidDirective ();
return false;
}
s = s.Substring (1);
return ! pp_primary (ref s);
} else
return pp_primary (ref s);
} else {
Error_InvalidDirective ();
return false;
}
}
bool pp_eq (ref string s)
{
bool va = pp_unary (ref s);
s = s.Trim ();
int len = s.Length;
if (len > 0){
if (s [0] == '='){
if (len > 2 && s [1] == '='){
s = s.Substring (2);
return va == pp_unary (ref s);
} else {
Error_InvalidDirective ();
return false;
}
} else if (s [0] == '!' && len > 1 && s [1] == '='){
s = s.Substring (2);
return va != pp_unary (ref s);
}
}
return va;
}
bool pp_and (ref string s)
{
bool va = pp_eq (ref s);
s = s.Trim ();
int len = s.Length;
if (len > 0){
if (s [0] == '&'){
if (len > 2 && s [1] == '&'){
s = s.Substring (2);
return (va & pp_and (ref s));
} else {
Error_InvalidDirective ();
return false;
}
}
}
return va;
}
//
// Evaluates an expression for `#if' or `#elif'
//
bool pp_expr (ref string s, bool isTerm)
{
bool va = pp_and (ref s);
s = s.Trim ();
int len = s.Length;
if (len > 0){
char c = s [0];
if (c == '|'){
if (len > 2 && s [1] == '|'){
s = s.Substring (2);
return va | pp_expr (ref s, isTerm);
} else {
Error_InvalidDirective ();
return false;
}
}
if (isTerm) {
Error_EndLineExpected ();
return false;
}
}
return va;
}
bool eval (string s)
{
bool v = pp_expr (ref s, true);
s = s.Trim ();
if (s.Length != 0){
return false;
}
return v;
}
void Error_NumericConstantTooLong ()
{
Report.Error (1021, Location, "Numeric constant too long");
}
void Error_InvalidDirective ()
{
Report.Error (1517, Location, "Invalid preprocessor directive");
}
void Error_UnexpectedDirective (string extra)
{
Report.Error (
1028, Location,
"Unexpected processor directive (" + extra + ")");
}
void Error_TokenExpected (string token)
{
Report.Error (1026, Location, "Expecting `{0}'", token);
}
void Error_TokensSeen ()
{
Report.Error (1032, Location,
"Cannot define or undefine preprocessor symbols after first token in file");
}
void Eror_WrongPreprocessorLocation ()
{
Report.Error (1040, Location,
"Preprocessor directives must appear as the first non-whitespace character on a line");
}
void Error_EndLineExpected ()
{
Report.Error (1025, Location, "Single-line comment or end-of-line expected");
}
//
// if true, then the code continues processing the code
// if false, the code stays in a loop until another directive is
// reached.
// When caller_is_taking is false we ignore all directives except the ones
// which can help us to identify where the #if block ends
bool handle_preprocessing_directive (bool caller_is_taking)
{
string cmd, arg;
bool region_directive = false;
get_cmd_arg (out cmd, out arg);
// Eat any trailing whitespaces and single-line comments
if (arg.IndexOf ("//") != -1)
arg = arg.Substring (0, arg.IndexOf ("//"));
arg = arg.Trim (simple_whitespaces);
//
// The first group of pre-processing instructions is always processed
//
switch (cmd){
case "region":
region_directive = true;
arg = "true";
goto case "if";
case "endregion":
if (ifstack == null || ifstack.Count == 0){
Error_UnexpectedDirective ("no #region for this #endregion");
return true;
}
int pop = (int) ifstack.Pop ();
if ((pop & REGION) == 0)
Report.Error (1027, Location, "Expected `#endif' directive");
return caller_is_taking;
case "if":
if (ifstack == null)
ifstack = new Stack (2);
int flags = region_directive ? REGION : 0;
if (ifstack.Count == 0){
flags |= PARENT_TAKING;
} else {
int state = (int) ifstack.Peek ();
if ((state & TAKING) != 0) {
flags |= PARENT_TAKING;
}
}
if (caller_is_taking && eval (arg)) {
ifstack.Push (flags | TAKING);
return true;
}
ifstack.Push (flags);
return false;
case "endif":
if (ifstack == null || ifstack.Count == 0){
Error_UnexpectedDirective ("no #if for this #endif");
return true;
} else {
pop = (int) ifstack.Pop ();
if ((pop & REGION) != 0)
Report.Error (1038, Location, "#endregion directive expected");
if (arg.Length != 0) {
Error_EndLineExpected ();
}
if (ifstack.Count == 0)
return true;
int state = (int) ifstack.Peek ();
return (state & TAKING) != 0;
}
case "elif":
if (ifstack == null || ifstack.Count == 0){
Error_UnexpectedDirective ("no #if for this #elif");
return true;
} else {
int state = (int) ifstack.Pop ();
if ((state & REGION) != 0) {
Report.Error (1038, Location, "#endregion directive expected");
return true;
}
if ((state & ELSE_SEEN) != 0){
Error_UnexpectedDirective ("#elif not valid after #else");
return true;
}
if ((state & TAKING) != 0) {
ifstack.Push (0);
return false;
}
if (eval (arg) && ((state & PARENT_TAKING) != 0)){
ifstack.Push (state | TAKING);
return true;
}
ifstack.Push (state);
return false;
}
case "else":
if (ifstack == null || ifstack.Count == 0){
Error_UnexpectedDirective ("no #if for this #else");
return true;
} else {
int state = (int) ifstack.Peek ();
if ((state & REGION) != 0) {
Report.Error (1038, Location, "#endregion directive expected");
return true;
}
if ((state & ELSE_SEEN) != 0){
Error_UnexpectedDirective ("#else within #else");
return true;
}
ifstack.Pop ();
if (arg.Length != 0) {
Error_EndLineExpected ();
return true;
}
bool ret = false;
if ((state & PARENT_TAKING) != 0) {
ret = (state & TAKING) == 0;
if (ret)
state |= TAKING;
else
state &= ~TAKING;
}
ifstack.Push (state | ELSE_SEEN);
return ret;
}
case "define":
if (any_token_seen){
Error_TokensSeen ();
return caller_is_taking;
}
PreProcessDefinition (true, arg, caller_is_taking);
return caller_is_taking;
case "undef":
if (any_token_seen){
Error_TokensSeen ();
return caller_is_taking;
}
PreProcessDefinition (false, arg, caller_is_taking);
return caller_is_taking;
}
//
// These are only processed if we are in a `taking' block
//
if (!caller_is_taking)
return false;
switch (cmd){
case "error":
Report.Error (1029, Location, "#error: '" + arg + "'");
return true;
case "warning":
Report.Warning (1030, 1, Location, "#warning: `{0}'", arg);
return true;
case "pragma":
if (RootContext.Version == LanguageVersion.ISO_1) {
Report.FeatureIsNotISO1 (Location, "#pragma");
return true;
}
PreProcessPragma (arg);
return true;
case "line":
if (!PreProcessLine (arg))
Report.Error (
1576, Location,
"The line number specified for #line directive is missing or invalid");
return caller_is_taking;
}
Report.Error (1024, Location, "Wrong preprocessor directive");
return true;
}
private int consume_string (bool quoted)
{
int c;
string_builder.Length = 0;
while ((c = get_char ()) != -1){
if (c == '"'){
if (quoted && peek_char () == '"'){
string_builder.Append ((char) c);
get_char ();
continue;
} else {
val = string_builder.ToString ();
return Token.LITERAL_STRING;
}
}
if (c == '\n'){
if (!quoted)
Report.Error (1010, Location, "Newline in constant");
}
if (!quoted){
c = escape (c);
if (c == -1)
return Token.ERROR;
}
string_builder.Append ((char) c);
}
Report.Error (1039, Location, "Unterminated string literal");
return Token.EOF;
}
private int consume_identifier (int s)
{
int res = consume_identifier (s, false);
if (doc_state == XmlCommentState.Allowed)
doc_state = XmlCommentState.NotAllowed;
switch (res) {
case Token.USING:
case Token.NAMESPACE:
check_incorrect_doc_comment ();
break;
}
if (res == Token.PARTIAL) {
if (parsing_block > 0) {
val = new LocatedToken (Location, "partial");
return Token.IDENTIFIER;
}
// Save current position and parse next token.
PushPosition ();
int next_token = token ();
bool ok = (next_token == Token.CLASS) ||
(next_token == Token.STRUCT) ||
(next_token == Token.INTERFACE);
PopPosition ();
if (ok) {
if (RootContext.Version == LanguageVersion.ISO_1)
Report.FeatureIsNotISO1 (Location, "partial types");
return res;
}
if (next_token < Token.LAST_KEYWORD)
Report.Error (267, Location, "The `partial' modifier can be used only immediately before keyword `class', `struct', or `interface'");
val = new LocatedToken (Location, "partial");
return Token.IDENTIFIER;
}
return res;
}
private int consume_identifier (int s, bool quoted)
{
int pos = 1;
int c = -1;
id_builder [0] = (char) s;
current_location = new Location (ref_line, Col);
while ((c = get_char ()) != -1) {
loop:
if (is_identifier_part_character ((char) c)){
if (pos == max_id_size){
Report.Error (645, Location, "Identifier too long (limit is 512 chars)");
return Token.ERROR;
}
id_builder [pos++] = (char) c;
// putback_char = -1;
} else if (c == '\\') {
c = escape (c);
goto loop;
} else {
// putback_char = c;
putback (c);
break;
}
}
//
// Optimization: avoids doing the keyword lookup
// on uppercase letters and _
//
if (!quoted && (s >= 'a' || s == '_')){
int keyword = GetKeyword (id_builder, pos);
if (keyword != -1) {
val = Location;
return keyword;
}
}
//
// Keep identifiers in an array of hashtables to avoid needless
// allocations
//
if (identifiers [pos] != null) {
val = identifiers [pos][id_builder];
if (val != null) {
val = new LocatedToken (Location, (string) val);
if (quoted)
escaped_identifiers.Add (val);
return Token.IDENTIFIER;
}
}
else
identifiers [pos] = new CharArrayHashtable (pos);
val = new String (id_builder, 0, pos);
if (RootContext.Version == LanguageVersion.ISO_1) {
for (int i = 1; i < id_builder.Length; i += 3) {
if (id_builder [i] == '_' && (id_builder [i - 1] == '_' || id_builder [i + 1] == '_')) {
Report.Error (1638, Location,
"`{0}': Any identifier with double underscores cannot be used when ISO language version mode is specified", val.ToString ());
break;
}
}
}
char [] chars = new char [pos];
Array.Copy (id_builder, chars, pos);
identifiers [pos] [chars] = val;
val = new LocatedToken (Location, (string) val);
if (quoted)
escaped_identifiers.Add (val);
return Token.IDENTIFIER;
}
public int xtoken ()
{
int t;
bool doread = false;
int c;
// Whether we have seen comments on the current line
bool comments_seen = false;
val = null;
for (;(c = get_char ()) != -1;) {
if (c == '\t'){
col = ((col + 8) / 8) * 8;
continue;
}
if (c == ' ' || c == '\f' || c == '\v' || c == 0xa0 || c == 0)
continue;
if (c == '\r') {
if (peek_char () == '\n')
get_char ();
any_token_seen |= tokens_seen;
tokens_seen = false;
comments_seen = false;
continue;
}
// Handle double-slash comments.
if (c == '/'){
int d = peek_char ();
if (d == '/'){
get_char ();
if (RootContext.Documentation != null && peek_char () == '/') {
get_char ();
// Don't allow ////.
if ((d = peek_char ()) != '/') {
update_comment_location ();
if (doc_state == XmlCommentState.Allowed)
handle_one_line_xml_comment ();
else if (doc_state == XmlCommentState.NotAllowed)
warn_incorrect_doc_comment ();
}
}
while ((d = get_char ()) != -1 && (d != '\n') && d != '\r')
if (d == '\n'){
}
any_token_seen |= tokens_seen;
tokens_seen = false;
comments_seen = false;
continue;
} else if (d == '*'){
get_char ();
bool docAppend = false;
if (RootContext.Documentation != null && peek_char () == '*') {
get_char ();
update_comment_location ();
// But when it is /**/, just do nothing.
if (peek_char () == '/') {
get_char ();
continue;
}
if (doc_state == XmlCommentState.Allowed)
docAppend = true;
else if (doc_state == XmlCommentState.NotAllowed)
warn_incorrect_doc_comment ();
}
int current_comment_start = 0;
if (docAppend) {
current_comment_start = xml_comment_buffer.Length;
xml_comment_buffer.Append (Environment.NewLine);
}
Location start_location = Location;
while ((d = get_char ()) != -1){
if (d == '*' && peek_char () == '/'){
get_char ();
comments_seen = true;
break;
}
if (docAppend)
xml_comment_buffer.Append ((char) d);
if (d == '\n'){
any_token_seen |= tokens_seen;
tokens_seen = false;
//
// Reset 'comments_seen' just to be consistent.
// It doesn't matter either way, here.
//
comments_seen = false;
}
}
if (!comments_seen)
Report.Error (1035, start_location, "End-of-file found, '*/' expected");
if (docAppend)
update_formatted_doc_comment (current_comment_start);
continue;
}
goto is_punct_label;
}
if (c == '\\' || is_identifier_start_character ((char)c)){
tokens_seen = true;
return consume_identifier (c);
}
is_punct_label:
current_location = new Location (ref_line, Col);
if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){
tokens_seen = true;
if (doread){
get_char ();
}
return t;
}
// white space
if (c == '\n'){
any_token_seen |= tokens_seen;
tokens_seen = false;
comments_seen = false;
continue;
}
if (c >= '0' && c <= '9'){
tokens_seen = true;
return is_number (c);
}
if (c == '.'){
tokens_seen = true;
int peek = peek_char ();
if (peek >= '0' && peek <= '9')
return is_number (c);
return Token.DOT;
}
if (c == '#') {
if (tokens_seen || comments_seen) {
Eror_WrongPreprocessorLocation ();
return Token.ERROR;
}
if (handle_preprocessing_directive (true))
continue;
bool directive_expected = false;
while ((c = get_char ()) != -1) {
if (col == 1) {
directive_expected = true;
} else if (!directive_expected) {
// TODO: Implement comment support for disabled code and uncomment this code
// if (c == '#') {
// Eror_WrongPreprocessorLocation ();
// return Token.ERROR;
// }
continue;
}
if (c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == '\f' || c == '\v' )
continue;
if (c == '#') {
if (handle_preprocessing_directive (false))
break;
}
directive_expected = false;
}
if (c != -1) {
tokens_seen = false;
continue;
}
return Token.EOF;
}
if (c == '"')
return consume_string (false);
if (c == '\''){
c = get_char ();
tokens_seen = true;
if (c == '\''){
error_details = "Empty character literal";
Report.Error (1011, Location, error_details);
return Token.ERROR;
}
if (c == '\r' || c == '\n') {
Report.Error (1010, Location, "Newline in constant");
return Token.ERROR;
}
c = escape (c);
if (c == -1)
return Token.ERROR;
val = new System.Char ();
val = (char) c;
c = get_char ();
if (c != '\''){
error_details = "Too many characters in character literal";
Report.Error (1012, Location, error_details);
// Try to recover, read until newline or next "'"
while ((c = get_char ()) != -1){
if (c == '\n'){
break;
}
else if (c == '\'')
break;
}
return Token.ERROR;
}
return Token.LITERAL_CHARACTER;
}
if (c == '@') {
c = get_char ();
if (c == '"') {
tokens_seen = true;
return consume_string (true);
} else if (is_identifier_start_character ((char) c)){
return consume_identifier (c, true);
} else {
Report.Error (1646, Location, "Keyword, identifier, or string expected after verbatim specifier: @");
}
}
error_details = ((char)c).ToString ();
return Token.ERROR;
}
return Token.EOF;
}
//
// Handles one line xml comment
//
private void handle_one_line_xml_comment ()
{
int c;
while ((c = peek_char ()) == ' ')
get_char (); // skip heading whitespaces.
while ((c = peek_char ()) != -1 && c != '\n' && c != '\r') {
xml_comment_buffer.Append ((char) get_char ());
}
if (c == '\r' || c == '\n')
xml_comment_buffer.Append (Environment.NewLine);
}
//
// Remove heading "*" in Javadoc-like xml documentation.
//
private void update_formatted_doc_comment (int current_comment_start)
{
int length = xml_comment_buffer.Length - current_comment_start;
string [] lines = xml_comment_buffer.ToString (
current_comment_start,
length).Replace ("\r", "").Split ('\n');
// The first line starts with /**, thus it is not target
// for the format check.
for (int i = 1; i < lines.Length; i++) {
string s = lines [i];
int idx = s.IndexOf ('*');
string head = null;
if (idx < 0) {
if (i < lines.Length - 1)
return;
head = s;
} else
head = s.Substring (0, idx);
foreach (char c in head)
if (c != ' ')
return;
lines [i] = s.Substring (idx + 1);
}
xml_comment_buffer.Remove (current_comment_start, length);
xml_comment_buffer.Insert (current_comment_start, String.Join (Environment.NewLine, lines));
}
//
// Updates current comment location.
//
private void update_comment_location ()
{
if (current_comment_location.IsNull) {
// "-2" is for heading "//" or "/*"
current_comment_location =
new Location (ref_line, col - 2);
}
}
//
// Checks if there was incorrect doc comments and raise
// warnings.
//
public void check_incorrect_doc_comment ()
{
if (xml_comment_buffer.Length > 0)
warn_incorrect_doc_comment ();
}
//
// Raises a warning when tokenizer found incorrect doccomment
// markup.
//
private void warn_incorrect_doc_comment ()
{
if (doc_state != XmlCommentState.Error) {
doc_state = XmlCommentState.Error;
// in csc, it is 'XML comment is not placed on
// a valid language element'. But that does not
// make sense.
Report.Warning (1587, 2, Location, "XML comment is not placed on a valid language element");
}
}
//
// Consumes the saved xml comment lines (if any)
// as for current target member or type.
//
public string consume_doc_comment ()
{
if (xml_comment_buffer.Length > 0) {
string ret = xml_comment_buffer.ToString ();
reset_doc_comment ();
return ret;
}
return null;
}
void reset_doc_comment ()
{
xml_comment_buffer.Length = 0;
current_comment_location = Location.Null;
}
public void cleanup ()
{
if (ifstack != null && ifstack.Count >= 1) {
current_location = new Location (ref_line, Col);
int state = (int) ifstack.Pop ();
if ((state & REGION) != 0)
Report.Error (1038, Location, "#endregion directive expected");
else
Report.Error (1027, Location, "Expected `#endif' directive");
}
}
}
//
// Indicates whether it accepts XML documentation or not.
//
public enum XmlCommentState {
// comment is allowed in this state.
Allowed,
// comment is not allowed in this state.
NotAllowed,
// once comments appeared when it is NotAllowed, then the
// state is changed to it, until the state is changed to
// .Allowed.
Error
}
}