//
// cs-tokenizer.cs: The Tokenizer for the C# compiler
// This also implements the preprocessor
//
//Modified by IZ for purposes of CS CODEDOM Parser, 2002
//(c) 2002 Ivan Zderadicka (ivan.zderadicka@seznam.cz)
//
// Author: Miguel de Icaza (miguel@gnu.org)
//
// Licensed under the terms of the GNU GPL
//
// (C) 2001 Ximian, Inc (http://www.ximian.com)
//
/*
* TODO:
* Make sure we accept the proper Unicode ranges, per the spec.
* Report error 1032
*/
using System;
using System.Text;
using System.Collections;
using System.IO;
using System.Globalization;
namespace Mono.CSharp
{
/// <summary>
/// Tokenizer for C# source code.
/// </summary>
public class Tokenizer : yyParser.yyInput
{
StreamReader reader;
public string ref_name;
public int ref_line = 1;
public int line = 1;
public int col = 1;
public int current_token;
bool handle_get_set = false;
bool handle_remove_add = false;
bool handle_assembly = false;
//IZ Added
IvanZ.CSParser.CommentBuilder cmtBuilder;
//
// 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;
//
// 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;
return ref_name + " " + "(" + line + "," + col + "), Token:" + current_token + " " + 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;
}
}
//
// Class variables
//
static Hashtable keywords;
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 TAKEN_BEFORE = 2;
const int ELSE_SEEN = 4;
const int PARENT_TAKING = 8;
//
// pre-processor if stack state:
//
Stack ifstack;
static System.Text.StringBuilder id_builder;
static System.Text.StringBuilder string_builder;
static System.Text.StringBuilder number_builder;
//
// Details about the error encoutered by the tokenizer
//
string error_details;
public string error {
get {
return error_details;
}
}
public int Line {
get {
return line;
}
}
public int Col {
get {
return col;
}
}
static void InitTokens ()
{
keywords = new Hashtable ();
keywords.Add ("abstract", Token.ABSTRACT);
keywords.Add ("as", Token.AS);
keywords.Add ("add", Token.ADD);
keywords.Add ("assembly", Token.ASSEMBLY);
keywords.Add ("base", Token.BASE);
keywords.Add ("bool", Token.BOOL);
keywords.Add ("break", Token.BREAK);
keywords.Add ("byte", Token.BYTE);
keywords.Add ("case", Token.CASE);
keywords.Add ("catch", Token.CATCH);
keywords.Add ("char", Token.CHAR);
keywords.Add ("checked", Token.CHECKED);
keywords.Add ("class", Token.CLASS);
keywords.Add ("const", Token.CONST);
keywords.Add ("continue", Token.CONTINUE);
keywords.Add ("decimal", Token.DECIMAL);
keywords.Add ("default", Token.DEFAULT);
keywords.Add ("delegate", Token.DELEGATE);
keywords.Add ("do", Token.DO);
keywords.Add ("double", Token.DOUBLE);
keywords.Add ("else", Token.ELSE);
keywords.Add ("enum", Token.ENUM);
keywords.Add ("event", Token.EVENT);
keywords.Add ("explicit", Token.EXPLICIT);
keywords.Add ("extern", Token.EXTERN);
keywords.Add ("false", Token.FALSE);
keywords.Add ("finally", Token.FINALLY);
keywords.Add ("fixed", Token.FIXED);
keywords.Add ("float", Token.FLOAT);
keywords.Add ("for", Token.FOR);
keywords.Add ("foreach", Token.FOREACH);
keywords.Add ("goto", Token.GOTO);
keywords.Add ("get", Token.GET);
keywords.Add ("if", Token.IF);
keywords.Add ("implicit", Token.IMPLICIT);
keywords.Add ("in", Token.IN);
keywords.Add ("int", Token.INT);
keywords.Add ("interface", Token.INTERFACE);
keywords.Add ("internal", Token.INTERNAL);
keywords.Add ("is", Token.IS);
keywords.Add ("lock", Token.LOCK);
keywords.Add ("long", Token.LONG);
keywords.Add ("namespace", Token.NAMESPACE);
keywords.Add ("new", Token.NEW);
keywords.Add ("null", Token.NULL);
keywords.Add ("object", Token.OBJECT);
keywords.Add ("operator", Token.OPERATOR);
keywords.Add ("out", Token.OUT);
keywords.Add ("override", Token.OVERRIDE);
keywords.Add ("params", Token.PARAMS);
keywords.Add ("private", Token.PRIVATE);
keywords.Add ("protected", Token.PROTECTED);
keywords.Add ("public", Token.PUBLIC);
keywords.Add ("readonly", Token.READONLY);
keywords.Add ("ref", Token.REF);
keywords.Add ("remove", Token.REMOVE);
keywords.Add ("return", Token.RETURN);
keywords.Add ("sbyte", Token.SBYTE);
keywords.Add ("sealed", Token.SEALED);
keywords.Add ("set", Token.SET);
keywords.Add ("short", Token.SHORT);
keywords.Add ("sizeof", Token.SIZEOF);
keywords.Add ("stackalloc", Token.STACKALLOC);
keywords.Add ("static", Token.STATIC);
keywords.Add ("string", Token.STRING);
keywords.Add ("struct", Token.STRUCT);
keywords.Add ("switch", Token.SWITCH);
keywords.Add ("this", Token.THIS);
keywords.Add ("throw", Token.THROW);
keywords.Add ("true", Token.TRUE);
keywords.Add ("try", Token.TRY);
keywords.Add ("typeof", Token.TYPEOF);
keywords.Add ("uint", Token.UINT);
keywords.Add ("ulong", Token.ULONG);
keywords.Add ("unchecked", Token.UNCHECKED);
keywords.Add ("unsafe", Token.UNSAFE);
keywords.Add ("ushort", Token.USHORT);
keywords.Add ("using", Token.USING);
keywords.Add ("virtual", Token.VIRTUAL);
keywords.Add ("void", Token.VOID);
keywords.Add ("volatile", Token.VOLATILE);
keywords.Add ("while", Token.WHILE);
}
//
// Class initializer
//
static Tokenizer ()
{
InitTokens ();
csharp_format_info = new NumberFormatInfo ();
csharp_format_info.CurrencyDecimalSeparator = ".";
styles = NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint;
id_builder = new System.Text.StringBuilder ();
string_builder = new System.Text.StringBuilder ();
number_builder = new System.Text.StringBuilder ();
}
bool is_keyword (string name)
{
bool res;
res = keywords.Contains (name);
if (handle_get_set == false && (name == "get" || name == "set"))
return false;
if (handle_remove_add == false && (name == "remove" || name == "add"))
return false;
if (handle_assembly == false && (name == "assembly"))
return false;
return res;
}
int GetKeyword (string name)
{
return (int) (keywords [name]);
}
public Location Location {
get {
return new Location (ref_line);
}
}
// IZ modified
public Tokenizer (System.IO.Stream input, string fname, ArrayList defs,
IvanZ.CSParser.CommentBuilder cb)
{
cmtBuilder =cb;
this.ref_name = fname;
reader = new System.IO.StreamReader (input);
putback_char = -1;
if (defs != null){
defines = new Hashtable ();
foreach (string def in defs)
defines [def] = true;
}
//
// FIXME: This could be `Location.Push' but we have to
// find out why the MS compiler allows this
//
Mono.CSharp.Location.Push (fname);
}
bool is_identifier_start_character (char c)
{
return Char.IsLetter (c) || c == '_' ;
}
bool is_identifier_part_character (char c)
{
return (Char.IsLetter (c) || Char.IsDigit (c) || c == '_');
}
int is_punct (char c, ref bool doread)
{
int d;
int t;
doread = false;
switch (c){
case '{':
return Token.OPEN_BRACE;
case '}':
return Token.CLOSE_BRACE;
case '[':
return Token.OPEN_BRACKET;
case ']':
return Token.CLOSE_BRACKET;
case '(':
return Token.OPEN_PARENS;
case ')':
return Token.CLOSE_PARENS;
case ',':
return Token.COMMA;
case ':':
return Token.COLON;
case ';':
return Token.SEMICOLON;
case '~':
return Token.TILDE;
case '?':
return Token.INTERR;
}
d = peekChar ();
if (c == '+'){
if (d == '+')
t = Token.OP_INC;
else if (d == '=')
t = Token.OP_ADD_ASSIGN;
else
return Token.PLUS;
doread = true;
return t;
}
if (c == '-'){
if (d == '-')
t = Token.OP_DEC;
else if (d == '=')
t = Token.OP_SUB_ASSIGN;
else if (d == '>')
t = Token.OP_PTR;
else
return Token.MINUS;
doread = true;
return t;
}
if (c == '!'){
if (d == '='){
doread = true;
return Token.OP_NE;
}
return Token.BANG;
}
if (c == '='){
if (d == '='){
doread = true;
return Token.OP_EQ;
}
return Token.ASSIGN;
}
if (c == '&'){
if (d == '&'){
doread = true;
return Token.OP_AND;
} else if (d == '='){
doread = true;
return Token.OP_AND_ASSIGN;
}
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;
}
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 (c == '<'){
if (d == '<'){
getChar ();
d = peekChar ();
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 == '>'){
getChar ();
d = peekChar ();
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;
}
return Token.ERROR;
}
bool decimal_digits (int c)
{
int d;
bool seen_digits = false;
if (c != -1)
number_builder.Append ((char) c);
while ((d = peekChar ()) != -1){
if (Char.IsDigit ((char)d)){
number_builder.Append ((char) d);
getChar ();
seen_digits = true;
} else
break;
}
return seen_digits;
}
bool is_hex (char e)
{
return Char.IsDigit (e) || (e >= 'A' && e <= 'F');
}
void hex_digits (int c)
{
int d;
if (c != -1)
number_builder.Append ((char) c);
while ((d = peekChar ()) != -1){
char e = Char.ToUpper ((char) d);
if (is_hex (e)){
number_builder.Append ((char) e);
getChar ();
} else
break;
}
}
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;
getChar ();
break;
case 'l':
if (!is_unsigned){
//
// if we have not seen anything in between
// report this error
//
Report.Warning (
78, Location,
"the 'l' suffix is easily confused with digit `1'," +
" use 'L' for clarity");
}
goto case 'L';
case 'L':
if (is_long)
scanning = false;
is_long = true;
getChar ();
break;
default:
scanning = false;
break;
}
c = peekChar ();
} 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)
{
ulong ul = System.UInt64.Parse (number_builder.ToString ());
return integer_type_suffix (ul, c);
}
int adjust_real (int t)
{
string s = number_builder.ToString ();
switch (t){
case Token.LITERAL_DECIMAL:
val = new System.Decimal ();
val = System.Decimal.Parse (
s, styles, csharp_format_info);
break;
case Token.LITERAL_DOUBLE:
val = new System.Double ();
val = System.Double.Parse (
s, styles, csharp_format_info);
break;
case Token.LITERAL_FLOAT:
val = new System.Double ();
val = (float) System.Double.Parse (
s, styles, csharp_format_info);
break;
case Token.NONE:
val = new System.Double ();
val = System.Double.Parse (
s, styles, csharp_format_info);
t = Token.LITERAL_DOUBLE;
break;
}
return t;
}
//
// Invoked if we know we have .digits or digits
//
int is_number (int c)
{
bool is_real = false;
int type;
number_builder.Length = 0;
if (Char.IsDigit ((char)c)){
if (c == '0' && peekChar () == 'x' || peekChar () == 'X'){
ulong ul;
getChar ();
hex_digits (-1);
string s = number_builder.ToString ();
ul = System.UInt64.Parse (s, NumberStyles.HexNumber);
return integer_type_suffix (ul, peekChar ());
}
decimal_digits (c);
c = getChar ();
}
//
// 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 = getChar ();
} else {
putback ('.');
number_builder.Length -= 1;
return adjust_int (-1);
}
}
if (c == 'e' || c == 'E'){
is_real = true;
number_builder.Append ("e");
c = getChar ();
if (c == '+'){
number_builder.Append ((char) c);
c = getChar ();
} else if (c == '-'){
number_builder.Append ((char) c);
c = getChar ();
}
decimal_digits (-1);
c = getChar ();
}
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 [] buffer = new int [8];
int i;
int total = 0;
int c;
char e;
int top = count != -1 ? count : 4;
getChar ();
error = false;
for (i = 0; i < top; i++){
c = getChar ();
e = Char.ToUpper ((char) c);
if (!is_hex (e)){
error = true;
return 0;
}
if (Char.IsDigit (e))
c = (int) e - (int) '0';
else
c = (int) e - (int) 'A';
total = (total * 16) + c;
if (count == -1){
int p = peekChar ();
if (p == -1)
break;
if (!is_hex ((char)p))
break;
}
}
return total;
}
int escape (int c)
{
bool error;
int d;
int v;
d = peekChar ();
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 in " + (char)d);
return -1;
}
getChar ();
return v;
}
int getChar ()
{
if (putback_char != -1){
int x = putback_char;
putback_char = -1;
return x;
}
return reader.Read ();
}
int peekChar ()
{
if (putback_char != -1)
return putback_char;
return reader.Peek ();
}
void putback (int c)
{
if (putback_char != -1)
throw new Exception ("This should not happen putback on putback");
putback_char = c;
}
public bool advance ()
{
return peekChar () != -1;
}
public Object Value {
get {
return val;
}
}
public Object value ()
{
return val;
}
public int token ()
{
current_token = xtoken ();
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;
while ((c = getChar ()) != -1 && (c != '\n') && (c != ' ') && (c != '\t')){
if (c == '\r')
continue;
static_cmd_arg.Append ((char) c);
}
cmd = static_cmd_arg.ToString ();
if (c == '\n'){
line++;
ref_line++;
return;
}
// skip over white space
while ((c = getChar ()) != -1 && (c != '\n') && ((c == ' ') || (c == '\t')))
;
if (c == '\n'){
line++;
ref_line++;
return;
}
static_cmd_arg.Length = 0;
static_cmd_arg.Append ((char) c);
while ((c = getChar ()) != -1 && (c != '\n')){
if (c == '\r')
continue;
static_cmd_arg.Append ((char) c);
}
if (c == '\n'){
line++;
ref_line++;
}
arg = static_cmd_arg.ToString ().Trim ();
}
//
// Handles the #line directive
//
bool PreProcessLine (string arg)
{
if (arg == "")
return false;
if (arg == "default"){
line = ref_line = line;
return false;
}
try {
int pos;
if ((pos = arg.IndexOf (' ')) != -1 && pos != 0){
ref_line = System.Int32.Parse (arg.Substring (0, pos));
pos++;
char [] quotes = { '\"' };
ref_name = arg.Substring (pos). Trim(quotes);
} else {
ref_line = System.Int32.Parse (arg);
}
} catch {
return false;
}
return true;
}
//
// Handles #define and #undef
//
void PreProcessDefinition (bool is_define, string arg)
{
if (arg == "" || arg == "true" || arg == "false"){
Report.Error(1001, Location, "Missing identifer to pre-processor directive");
return;
}
if (is_define){
if (defines == null)
defines = new Hashtable ();
defines [arg] = 1;
} else {
if (defines == null)
return;
if (defines.Contains (arg))
defines.Remove (arg);
}
}
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);
if (s.Length > 0 && s [0] == ')')
return val;
Error_InvalidDirective ();
return false;
}
if (Char.IsLetter (c) || c == '_'){
int j = 1;
while (j < len){
c = s [j];
if (Char.IsLetter (c) || Char.IsDigit (c) || 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_eq (ref s);
} else {
Error_InvalidDirective ();
return false;
}
}
}
return va;
}
//
// Evaluates an expression for `#if' or `#elif'
//
bool pp_expr (ref string s)
{
bool va = pp_and (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;
}
} else {
Error_InvalidDirective ();
return false;
}
}
return va;
}
bool eval (string s)
{
bool v = pp_expr (ref s);
return v;
}
void Error_InvalidDirective ()
{
Report.Error (1517, Location, "Invalid pre-processor directive");
}
void Error_UnexpectedDirective (string extra)
{
Report.Error (
1028, Location,
"Unexpected processor directive (" + extra + ")");
}
void Error_TokensSeen ()
{
Report.Error (
1032, Location,
"Cannot define or undefine pre-processor symbols after a token in the file");
}
//
// if true, then the code continues processing the code
// if false, the code stays in a loop until another directive is
// reached.
//
bool handle_preprocessing_directive (bool caller_is_taking)
{
char [] blank = { ' ', '\t' };
string cmd, arg;
get_cmd_arg (out cmd, out arg);
//
// The first group of pre-processing instructions is always processed
//
switch (cmd){
case "line":
if (!PreProcessLine (arg))
Report.Error (
1576, Location,
"Argument to #line directive is missing or invalid");
return true;
case "region":
arg = "true";
goto case "if";
case "endregion":
goto case "endif";
case "if":
if (arg == ""){
Error_InvalidDirective ();
return true;
}
bool taking = false;
if (ifstack == null)
ifstack = new Stack ();
if (ifstack.Count == 0){
taking = true;
} else {
int state = (int) ifstack.Peek ();
if ((state & TAKING) != 0)
taking = true;
}
if (eval (arg) && taking){
ifstack.Push (TAKING | TAKEN_BEFORE | PARENT_TAKING);
return true;
} else {
ifstack.Push (taking ? PARENT_TAKING : 0);
return false;
}
case "endif":
if (ifstack == null || ifstack.Count == 0){
Error_UnexpectedDirective ("no #if for this #endif");
return true;
} else {
ifstack.Pop ();
if (ifstack.Count == 0)
return true;
else {
int state = (int) ifstack.Peek ();
if ((state & TAKING) != 0)
return true;
else
return false;
}
}
case "elif":
if (ifstack == null || ifstack.Count == 0){
Error_UnexpectedDirective ("no #if for this #elif");
return true;
} else {
int state = (int) ifstack.Peek ();
if ((state & ELSE_SEEN) != 0){
Error_UnexpectedDirective ("#elif not valid after #else");
return true;
}
if ((state & (TAKEN_BEFORE | TAKING)) != 0)
return false;
if (eval (arg) && ((state & PARENT_TAKING) != 0)){
state = (int) ifstack.Pop ();
ifstack.Push (state | TAKING | TAKEN_BEFORE);
return true;
} else
return false;
}
case "else":
if (ifstack == null || ifstack.Count == 0){
Report.Error (
1028, Location,
"Unexpected processor directive (no #if for this #else)");
return true;
} else {
int state = (int) ifstack.Peek ();
if ((state & ELSE_SEEN) != 0){
Error_UnexpectedDirective ("#else within #else");
return true;
}
ifstack.Pop ();
ifstack.Push (state | ELSE_SEEN);
if ((state & TAKEN_BEFORE) == 0){
if ((state & PARENT_TAKING) != 0)
return true;
else
return false;
}
return false;
}
}
//
// These are only processed if we are in a `taking' block
//
if (!caller_is_taking)
return false;
switch (cmd){
case "define":
if (any_token_seen){
Error_TokensSeen ();
return true;
}
PreProcessDefinition (true, arg);
return true;
case "undef":
if (any_token_seen){
Error_TokensSeen ();
return true;
}
PreProcessDefinition (false, arg);
return true;
case "error":
Report.Error (1029, Location, "#error: '" + arg + "'");
return true;
case "warning":
Report.Warning (1030, Location, "#warning: '" + arg + "'");
return true;
}
Report.Error (1024, Location, "Preprocessor directive expected (got: " + cmd + ")");
return true;
}
public int xtoken ()
{
int t;
bool allow_keyword_as_ident = false;
bool doread = false;
int c;
val = null;
// optimization: eliminate col and implement #directive semantic correctly.
for (;(c = getChar ()) != -1; col++) {
if (Char.IsLetter ((char)c) || c == '_'){
string ids;
id_builder.Length = 0;
tokens_seen = true;
id_builder.Append ((char) c);
while ((c = peekChar ()) != -1) {
if (is_identifier_part_character ((char) c)){
id_builder.Append ((char)getChar ());
col++;
} else
break;
}
ids = id_builder.ToString ();
if (!is_keyword (ids) || allow_keyword_as_ident) {
val = ids;
if (ids.Length > 512){
Report.Error (
645, Location,
"Identifier too long (limit is 512 chars)");
}
allow_keyword_as_ident = false;
return Token.IDENTIFIER;
}
// true, false and null are in the hash anyway.
return GetKeyword (ids);
}
if (c == '.'){
tokens_seen = true;
if (Char.IsDigit ((char) peekChar ()))
return is_number (c);
return Token.DOT;
}
if (Char.IsDigit ((char) c)){
tokens_seen = true;
return is_number (c);
}
// Handle double-slash comments.
if (c == '/'){
int d = peekChar ();
if (d == '/'){
getChar ();
cmtBuilder.StartComment(line);
while ((d = getChar ()) != -1 && (d != '\n'))
//IZ modified to remember comments
{
col++;
cmtBuilder.AddChar((char) d);
}
line++;
ref_line++;
col = 0;
any_token_seen |= tokens_seen;
tokens_seen = false;
cmtBuilder.FinishComment();
continue;
} else if (d == '*'){
getChar ();
cmtBuilder.StartComment(line);
while ((d = getChar ()) != -1){
if (d == '*' && peekChar () == '/'){
getChar ();
col++;
break;
}
if (d == '\n'){
line++;
ref_line++;
col = 0;
any_token_seen |= tokens_seen;
tokens_seen = false;
}
cmtBuilder.AddChar((char) d);
}
cmtBuilder.FinishComment();
continue;
}
}
/* For now, ignore pre-processor commands */
// FIXME: In C# the '#' is not limited to appear
// on the first column.
if (c == '#' && !tokens_seen){
bool cont = true;
start_again:
cont = handle_preprocessing_directive (cont);
if (cont){
col = 0;
continue;
}
col = 1;
bool skipping = false;
for (;(c = getChar ()) != -1; col++){
if (c == '\n'){
col = 0;
line++;
ref_line++;
skipping = false;
} else if (c == ' ' || c == '\t' || c == '\v' || c == '\r')
continue;
else if (c != '#')
skipping = true;
if (c == '#' && !skipping)
goto start_again;
}
any_token_seen |= tokens_seen;
tokens_seen = false;
if (c == -1)
Report.Error (1027, Location, "#endif expected");
continue;
}
if ((t = is_punct ((char)c, ref doread)) != Token.ERROR){
tokens_seen = true;
if (doread){
getChar ();
col++;
}
return t;
}
if (c == '"'){
string_builder.Length = 0;
tokens_seen = true;
while ((c = getChar ()) != -1){
if (c == '"'){
if (allow_keyword_as_ident && peekChar () == '"'){
string_builder.Append ((char) c);
getChar ();
continue;
}
allow_keyword_as_ident = false;
val = string_builder.ToString ();
return Token.LITERAL_STRING;
}
if (!allow_keyword_as_ident){
c = escape (c);
if (c == -1)
return Token.ERROR;
}
string_builder.Append ((char) c);
}
}
if (c == '\''){
c = getChar ();
tokens_seen = true;
if (c == '\''){
error_details = "Empty character literal";
Report.Error (1011, Location, error_details);
return Token.ERROR;
}
c = escape (c);
if (c == -1)
return Token.ERROR;
val = new System.Char ();
val = (char) c;
c = getChar ();
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 = getChar ()) != -1){
if (c == '\n' || c == '\'')
break;
}
return Token.ERROR;
}
return Token.LITERAL_CHARACTER;
}
// white space
if (c == '\n'){
line++;
ref_line++;
col = 0;
any_token_seen |= tokens_seen;
tokens_seen = false;
continue;
}
if (c == ' ' || c == '\t' || c == '\f' || c == '\v' || c == '\r'){
if (c == '\t')
col = (((col + 8) / 8) * 8) - 1;
continue;
}
if (c == '@'){
tokens_seen = true;
allow_keyword_as_ident = true;
continue;
}
error_details = ((char)c).ToString ();
return Token.ERROR;
}
if (ifstack != null && ifstack.Count > 1)
Report.Error (1027, Location, "#endif expected");
return Token.EOF;
}
}
}