//
// Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
/****************************************************************************\
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//
// scanner.c
//

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#if 0
    #include <ieeefp.h>
    #else
    #define isinff(x) (((*(int *)&(x) & 0x7f800000L)==0x7f800000L) && \
                       ((*(int *)&(x) & 0x007fffffL)==0000000000L))
#endif

#include "slglobals.h"


typedef struct StringInputSrc {
    InputSrc base;
    char *p;
} StringInputSrc;

static int eof_scan(InputSrc *is, yystypepp * yylvalpp)
{
    return EOF;
} // eof_scan

static void noop(InputSrc *in, int ch, yystypepp * yylvalpp) {}

static InputSrc eof_inputsrc = { 0, &eof_scan, &eof_scan, &noop };

static int byte_scan(InputSrc *, yystypepp * yylvalpp);

#define EOL_SY '\n'

#if defined(_WIN32)
    #define DBG_BREAKPOINT() __asm int 3
    #elif defined(_M_AMD64)
    #define DBG_BREAKPOINT() assert(!"Dbg_Breakpoint");
    #else
    #define DBG_BREAKPOINT()
    #endif

    #if defined(_WIN32) && !defined(_M_AMD64)
    __int64 RDTSC ( void ) {

        __int64 v;
    
        __asm __emit 0x0f
        __asm __emit 0x31
        __asm mov dword ptr v, eax
        __asm mov dword ptr v+4, edx
    
        return v;
    }
#endif


int InitScanner(CPPStruct *cpp)
{
    // Add various atoms needed by the CPP line scanner:
    if (!InitCPP())
        return 0;

    cpp->mostRecentToken = 0;
    cpp->tokenLoc = &cpp->ltokenLoc;

    cpp->ltokenLoc.file = 0;
    cpp->ltokenLoc.line = 0;

    cpp->currentInput = &eof_inputsrc;
    cpp->previous_token = '\n';
    cpp->notAVersionToken = 0;

    return 1;
} // InitScanner

int FreeScanner(void)
{
    return (FreeCPP());
}

/*
 * str_getch()
 * takes care of reading from multiple strings.
 * returns the next-char from the input stream.
 * returns EOF when the complete shader is parsed.
 */
static int str_getch(StringInputSrc *in)
{
	for(;;){
	   if (*in->p){
	      if (*in->p == '\n') {
             in->base.line++;
             IncLineNumber();
          }
          return *in->p++;
	   }
	   if(++(cpp->PaWhichStr) < cpp->PaArgc){
		  free(in);
		  SetStringNumber(cpp->PaWhichStr);
    	  SetLineNumber(1);
		  ScanFromString(cpp->PaArgv[cpp->PaWhichStr]);
		  in=(StringInputSrc*)cpp->currentInput;
	      continue;             
	   }
	   else{
	      cpp->currentInput = in->base.prev;
	      cpp->PaWhichStr=0;
          free(in);
          return EOF;
       }  
	}
} // str_getch

static void str_ungetch(StringInputSrc *in, int ch, yystypepp *type) {
    if (in->p[-1] == ch)in->p--;
	else {
		*(in->p)='\0'; //this would take care of shifting to the previous string.
	    cpp->PaWhichStr--;
	}  
	if (ch == '\n') {
        in->base.line--;
        DecLineNumber();
    }
} // str_ungetch

int ScanFromString(char *s)
{
    
	StringInputSrc *in = malloc(sizeof(StringInputSrc));
    memset(in, 0, sizeof(StringInputSrc));
	in->p = s;
    in->base.line = 1;
    in->base.scan = byte_scan;
    in->base.getch = (int (*)(InputSrc *, yystypepp *))str_getch;
    in->base.ungetch = (void (*)(InputSrc *, int, yystypepp *))str_ungetch;
    in->base.prev = cpp->currentInput;
    cpp->currentInput = &in->base;

    return 1;
} // ScanFromString;


///////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////// Floating point constants: /////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////
/*
 * lBuildFloatValue() - Quick and dirty conversion to floating point.  Since all
 *         we need is single precision this should be quite precise.
 */

static float lBuildFloatValue(const char *str, int len, int exp)
{
    double val, expval, ten;
    int ii, llen, absexp;
    float rv;

    val = 0.0;
    llen = len;
    for (ii = 0; ii < len; ii++)
        val = val*10.0 + (str[ii] - '0');
    if (exp != 0) {
        absexp = exp > 0 ? exp : -exp;
        expval = 1.0f;
        ten = 10.0;
        while (absexp) {
            if (absexp & 1)
                expval *= ten;
            ten *= ten;
            absexp >>= 1;
        }
        if (exp >= 0) {
            val *= expval;
        } else {
            val /= expval;
        }
    }
    rv = (float)val;
    if (isinff(rv)) {
		CPPErrorToInfoLog(" ERROR___FP_CONST_OVERFLOW");
    }
    return rv;
} // lBuildFloatValue


/*
 * lFloatConst() - Scan a floating point constant.  Assumes that the scanner
 *         has seen at least one digit, followed by either a decimal '.' or the
 *         letter 'e'.
 */

static int lFloatConst(char *str, int len, int ch, yystypepp * yylvalpp)
{
    int HasDecimal, declen, exp, ExpSign;
    int str_len;
    float lval;
    
    HasDecimal = 0;
    declen = 0;
    exp = 0;
	
    str_len=len;
    if (ch == '.') {
		str[len++]=ch;
        HasDecimal = 1;
        ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
        while (ch >= '0' && ch <= '9') {
            if (len < MAX_SYMBOL_NAME_LEN) {
                declen++;
                if (len > 0 || ch != '0') {
                    str[len] = ch;
                    len++;str_len++;
                }
                ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            } else {
                CPPErrorToInfoLog("ERROR___FP_CONST_TOO_LONG");
                len = 1,str_len=1;
            }
        }
    }

    // Exponent:

    if (ch == 'e' || ch == 'E') {
        ExpSign = 1;
		str[len++]=ch;
        ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
        if (ch == '+') {
            str[len++]=ch;  
			ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
        } else if (ch == '-') {
            ExpSign = -1;
			str[len++]=ch;
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
        }
        if (ch >= '0' && ch <= '9') {
            while (ch >= '0' && ch <= '9') {
                exp = exp*10 + ch - '0';
				str[len++]=ch;
                ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            }
        } else {
            CPPErrorToInfoLog("ERROR___ERROR_IN_EXPONENT");
        }
        exp *= ExpSign;
    }
      
    if (len == 0) {
        lval = 0.0f;
		strcpy(str,"0.0");
    } else {
        str[len]='\0';      
        lval = lBuildFloatValue(str, str_len, exp - declen);
    }
    // Suffix:
    
    yylvalpp->sc_fval = lval;
    strcpy(yylvalpp->symbol_name,str);
    cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);            
    return CPP_FLOATCONSTANT;
} // lFloatConst

///////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////// Normal Scanner //////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////
    
static int byte_scan(InputSrc *in, yystypepp * yylvalpp)
{
    char symbol_name[MAX_SYMBOL_NAME_LEN + 1];
    char string_val[MAX_STRING_LEN + 1];
    int AlreadyComplained;
    int len, ch, ii, ival = 0;

    for (;;) {
        yylvalpp->sc_int = 0;
        ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
		
        while (ch == ' ' || ch == '\t' || ch == '\r') {
            yylvalpp->sc_int = 1;
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
        }
		
        cpp->ltokenLoc.file = cpp->currentInput->name;
        cpp->ltokenLoc.line = cpp->currentInput->line;
        len = 0;
        switch (ch) {
        default:
			return ch; // Single character token
        case EOF:
            return -1;
		case 'A': case 'B': case 'C': case 'D': case 'E':
        case 'F': case 'G': case 'H': case 'I': case 'J':
        case 'K': case 'L': case 'M': case 'N': case 'O':
        case 'P': case 'Q': case 'R': case 'S': case 'T':
        case 'U': case 'V': case 'W': case 'X': case 'Y':
        case 'Z': case '_':
        case 'a': case 'b': case 'c': case 'd': case 'e':
        case 'f': case 'g': case 'h': case 'i': case 'j':
        case 'k': case 'l': case 'm': case 'n': case 'o':
        case 'p': case 'q': case 'r': case 's': case 't':
        case 'u': case 'v': case 'w': case 'x': case 'y':
        case 'z':            
            do {
                if (len < MAX_SYMBOL_NAME_LEN) {
                    symbol_name[len] = ch;
                    len++;
                    ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);					
                } else {
                    ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                }
            } while ((ch >= 'a' && ch <= 'z') ||
                     (ch >= 'A' && ch <= 'Z') ||
                     (ch >= '0' && ch <= '9') ||
                     ch == '_');
            if (len >= MAX_SYMBOL_NAME_LEN)
                len = MAX_SYMBOL_NAME_LEN - 1;
            symbol_name[len] = '\0';
            cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
            yylvalpp->sc_ident = LookUpAddString(atable, symbol_name);
            return CPP_IDENTIFIER;
            break;
        case '0':
            yylvalpp->symbol_name[len++] = ch;
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == 'x' || ch == 'X') {
				yylvalpp->symbol_name[len++] = ch;
                ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                if ((ch >= '0' && ch <= '9') ||
                    (ch >= 'A' && ch <= 'F') ||
                    (ch >= 'a' && ch <= 'f'))
                {
                    AlreadyComplained = 0;
                    ival = 0;
                    do {
						yylvalpp->symbol_name[len++] = ch;
                        if (ival <= 0x0fffffff) {
                            if (ch >= '0' && ch <= '9') {
                                ii = ch - '0';
                            } else if (ch >= 'A' && ch <= 'F') {
                                ii = ch - 'A' + 10;
                            } else {
                                ii = ch - 'a' + 10;
                            }
                            ival = (ival << 4) | ii;
                        } else {
                            if (!AlreadyComplained)
                                CPPErrorToInfoLog("ERROR___HEX_CONST_OVERFLOW");
                            AlreadyComplained = 1;
                        }
                        ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                    } while ((ch >= '0' && ch <= '9') ||
                             (ch >= 'A' && ch <= 'F') ||
                             (ch >= 'a' && ch <= 'f'));
                } else {
                    CPPErrorToInfoLog("ERROR___ERROR_IN_HEX_CONSTANT");
                }
                yylvalpp->symbol_name[len] = '\0';
				cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
				yylvalpp->sc_int = ival;
                return CPP_INTCONSTANT;
            } else if (ch >= '0' && ch <= '7') { // octal integer constants
                AlreadyComplained = 0;
                ival = 0;
                do {
                    yylvalpp->symbol_name[len++] = ch;
                    if (ival <= 0x1fffffff) {
                        ii = ch - '0';
                        ival = (ival << 3) | ii;
                    } else {
                        if (!AlreadyComplained)
                           CPPErrorToInfoLog("ERROR___OCT_CONST_OVERFLOW");
                        AlreadyComplained = 1;
                    }
                    ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                } while (ch >= '0' && ch <= '7');
                if (ch == '.' || ch == 'e' || ch == 'f' || ch == 'h' || ch == 'x'|| ch == 'E') 
                     return lFloatConst(yylvalpp->symbol_name, len, ch, yylvalpp);
                yylvalpp->symbol_name[len] = '\0';
				cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
				yylvalpp->sc_int = ival;
                return CPP_INTCONSTANT;
            } else {
				cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
				ch = '0';
            }
            // Fall through...
        case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
            do {
                if (len < MAX_SYMBOL_NAME_LEN) {
                    if (len > 0 || ch != '0') {
                        yylvalpp->symbol_name[len] = ch;
                   len++;
                    }
                    ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                }
            } while (ch >= '0' && ch <= '9');
            if (ch == '.' || ch == 'e' || ch == 'f' || ch == 'h' || ch == 'x'|| ch == 'E') {
                return lFloatConst(yylvalpp->symbol_name, len, ch, yylvalpp);
            } else {
                yylvalpp->symbol_name[len] = '\0';
				cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                ival = 0;
                AlreadyComplained = 0;
                for (ii = 0; ii < len; ii++) {
                    ch = yylvalpp->symbol_name[ii] - '0';
                    if ((ival > 214748364) || (ival == 214748364 && ch >= 8)) {
                        if (!AlreadyComplained)
                           CPPErrorToInfoLog("ERROR___INTEGER_CONST_OVERFLOW");
                        AlreadyComplained = 1;
                    }
                    ival = ival*10 + ch;
                }
                yylvalpp->sc_int = ival;
                if(ival==0)
                   strcpy(yylvalpp->symbol_name,"0");
                return CPP_INTCONSTANT;
            }
            break;
        case '-':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '-') {
                return CPP_DEC_OP;
            } else if (ch == '=') {
                return CPP_SUB_ASSIGN;
            } else {
                cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                return '-';
            }
        case '+':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '+') {
                return CPP_INC_OP;
            } else if (ch == '=') {
                return CPP_ADD_ASSIGN;
            } else {
                cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                return '+';
            }
        case '*':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '=') {
                return CPP_MUL_ASSIGN;
            } else {
                cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                return '*';
            }
        case '%':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '=') {
                return CPP_MOD_ASSIGN;
            } else if (ch == '>'){
                return CPP_RIGHT_BRACE;
            } else {
                cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                return '%';
            }
        case ':':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '>') {
                return CPP_RIGHT_BRACKET;
            } else {
                cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                return ':';
            }
        case '^':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '^') {
                return CPP_XOR_OP;
            } else {
                if (ch == '=')
                    return CPP_XOR_ASSIGN;
                else{
                  cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                  return '^';
                }
            }
        
        case '=':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '=') {
                return CPP_EQ_OP;
            } else {
                cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                return '=';
            }
        case '!':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '=') {
                return CPP_NE_OP;
            } else {
                cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                return '!';
            }
        case '|':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '|') {
                return CPP_OR_OP;
            } else {
                if (ch == '=')
                    return CPP_OR_ASSIGN;
                else{
                  cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                  return '|';
                }
            }
        case '&':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '&') {
                return CPP_AND_OP;
            } else {
                if (ch == '=')
                    return CPP_AND_ASSIGN;
                else{
                  cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                  return '&';
                }
            }
        case '<':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '<') {
                ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                if(ch == '=')
                    return CPP_LEFT_ASSIGN;
                else{
                    cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                    return CPP_LEFT_OP;
                }
            } else {
                if (ch == '=') {
                    return CPP_LE_OP;
                } else {
                    if (ch == '%')
                        return CPP_LEFT_BRACE;
                    else if (ch == ':')
                        return CPP_LEFT_BRACKET;
                    else{
                        cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                        return '<';
                    }
                }
            }
        case '>':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '>') {
                ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                if(ch == '=')
                    return CPP_RIGHT_ASSIGN;
                else{
                    cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                    return CPP_RIGHT_OP;
                }
            } else {
                if (ch == '=') {
                    return CPP_GE_OP;
                } else {
                    cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                    return '>';
                }
            }
        case '.':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch >= '0' && ch <= '9') {
                cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                return lFloatConst(yylvalpp->symbol_name, 0, '.', yylvalpp);
            } else {
                if (ch == '.') {
                    return -1; // Special EOF hack
                } else {
                    cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                    return '.';
                }
            }
        case '/':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            if (ch == '/') {
                do {
                    ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                } while (ch != '\n' && ch != EOF);
                if (ch == EOF)
                    return -1;
                return '\n';
            } else if (ch == '*') {
                int nlcount = 0;
                ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                do {
                    while (ch != '*') {
                        if (ch == '\n') nlcount++;
                        if (ch == EOF) {
                            CPPErrorToInfoLog("ERROR___EOF_IN_COMMENT");
                            return -1;
                        }
                        ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                    }
                    ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                    if (ch == EOF) {
                        CPPErrorToInfoLog("ERROR___EOF_IN_COMMENT");
                        return -1;
                    }
                } while (ch != '/');
                if (nlcount) {
                    return '\n';
                }
                // Go try it again...
            } else if (ch == '=') {
                return CPP_DIV_ASSIGN;
            } else {
                cpp->currentInput->ungetch(cpp->currentInput, ch, yylvalpp);
                return '/';
            }
            break;
        case '"':
            ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
            while (ch != '"' && ch != '\n' && ch != EOF) {
                if (ch == '\\') {
                    ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                    if (ch == '\n' || ch == EOF) {
                        break;
                    }
                }
                if (len < MAX_STRING_LEN) {
                    string_val[len] = ch;
                    len++;
                    ch = cpp->currentInput->getch(cpp->currentInput, yylvalpp);
                }
            };
            string_val[len] = '\0';
            if (ch == '"') {
                yylvalpp->sc_ident = LookUpAddString(atable, string_val);
                return CPP_STRCONSTANT;
            } else {
                CPPErrorToInfoLog("ERROR___CPP_EOL_IN_STRING");
                return ERROR_SY;
            }
        }
    }
} // byte_scan

int yylex_CPP(char* buf, int maxSize)
{    
	yystypepp yylvalpp;
    int token = '\n';   

    for(;;) {

        char* tokenString = 0;
        token = cpp->currentInput->scan(cpp->currentInput, &yylvalpp);
		if(check_EOF(token))
		    return 0;
        if (token == '#') {
            if (cpp->previous_token == '\n'|| cpp->previous_token == 0) {
			    token = readCPPline(&yylvalpp);
                if(check_EOF(token))
                    return 0;
			    continue;
            } else {
                CPPErrorToInfoLog("preprocessor command must not be preceded by any other statement in that line");
                return 0;
            }
        }
        cpp->previous_token = token;
        // expand macros
        if (token == CPP_IDENTIFIER && MacroExpand(yylvalpp.sc_ident, &yylvalpp)) {
            cpp->notAVersionToken = 1;
            continue;
        }
        
        if (token == '\n')
            continue;
          
        if (token == CPP_IDENTIFIER) {                
            cpp->notAVersionToken = 1;
            tokenString = GetStringOfAtom(atable,yylvalpp.sc_ident);
        } else if (token == CPP_FLOATCONSTANT||token == CPP_INTCONSTANT){             
            cpp->notAVersionToken = 1;            
            tokenString = yylvalpp.symbol_name;
		} else {            
            cpp->notAVersionToken = 1;            
            tokenString = GetStringOfAtom(atable,token);
	    }

        if (tokenString) {
            if ((signed)strlen(tokenString) >= maxSize) {
                cpp->tokensBeforeEOF = 1;
                return maxSize;               
            } else  if (strlen(tokenString) > 0) {
			    strcpy(buf, tokenString);
                cpp->tokensBeforeEOF = 1;
                return (int)strlen(tokenString);
            }  

            return 0;
        }
    }

    return 0;
} // yylex

//Checks if the token just read is EOF or not.
int check_EOF(int token)
{
   if(token==-1){
       if(cpp->ifdepth >0){
		CPPErrorToInfoLog("#endif missing!! Compilation stopped");
        cpp->CompileError=1;
       }
      return 1;
   }
   return 0;
}

///////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////// End of scanner.c //////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////

