//
// Copyright (C) 2002-2005  3Dlabs Inc. Ltd.
// Copyright (C) 2013 LunarG, Inc.
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//
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/****************************************************************************\
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//
// For recording and playing back the stream of tokens in a macro definition.
//

#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#if (defined(_MSC_VER) && _MSC_VER < 1900 /*vs2015*/)
#define snprintf sprintf_s
#endif

#include <cassert>
#include <cstdlib>
#include <cstring>
#include <cctype>

#include "PpContext.h"
#include "PpTokens.h"

namespace glslang {

// push onto back of stream
void TPpContext::TokenStream::putSubtoken(char subtoken)
{
    data.push_back(static_cast<unsigned char>(subtoken));
}

// get the next token in stream
int TPpContext::TokenStream::getSubtoken()
{
    if (current < data.size())
        return data[current++];
    else
        return EndOfInput;
}

// back up one position in the stream
void TPpContext::TokenStream::ungetSubtoken()
{
    if (current > 0)
        --current;
}

// Add a complete token (including backing string) to the end of a list
// for later playback.
void TPpContext::TokenStream::putToken(int token, TPpToken* ppToken)
{
    const char* s;
    char* str = NULL;

    assert((token & ~0xff) == 0);
    putSubtoken(static_cast<char>(token));

    switch (token) {
    case PpAtomIdentifier:
    case PpAtomConstString:
        s = ppToken->name;
        while (*s)
            putSubtoken(*s++);
        putSubtoken(0);
        break;
    case PpAtomConstInt:
    case PpAtomConstUint:
    case PpAtomConstInt64:
    case PpAtomConstUint64:
#ifdef AMD_EXTENSIONS
    case PpAtomConstInt16:
    case PpAtomConstUint16:
#endif
    case PpAtomConstFloat:
    case PpAtomConstDouble:
    case PpAtomConstFloat16:
        str = ppToken->name;
        while (*str) {
            putSubtoken(*str);
            str++;
        }
        putSubtoken(0);
        break;
    default:
        break;
    }
}

// Read the next token from a token stream.
// (Not the source stream, but a stream used to hold a tokenized macro).
int TPpContext::TokenStream::getToken(TParseContextBase& parseContext, TPpToken *ppToken)
{
    int len;
    int ch;

    int subtoken = getSubtoken();
    ppToken->loc = parseContext.getCurrentLoc();
    switch (subtoken) {
    case '#':
        // Check for ##, unless the current # is the last character
        if (current < data.size()) {
            if (getSubtoken() == '#') {
                parseContext.requireProfile(ppToken->loc, ~EEsProfile, "token pasting (##)");
                parseContext.profileRequires(ppToken->loc, ~EEsProfile, 130, 0, "token pasting (##)");
                subtoken = PpAtomPaste;
            } else
                ungetSubtoken();
        }
        break;
    case PpAtomConstString:
    case PpAtomIdentifier:
    case PpAtomConstFloat:
    case PpAtomConstDouble:
    case PpAtomConstFloat16:
    case PpAtomConstInt:
    case PpAtomConstUint:
    case PpAtomConstInt64:
    case PpAtomConstUint64:
#ifdef AMD_EXTENSIONS
    case PpAtomConstInt16:
    case PpAtomConstUint16:
#endif
        len = 0;
        ch = getSubtoken();
        while (ch != 0 && ch != EndOfInput) {
            if (len < MaxTokenLength) {
                ppToken->name[len] = (char)ch;
                len++;
                ch = getSubtoken();
            } else {
                parseContext.error(ppToken->loc, "token too long", "", "");
                break;
            }
        }
        ppToken->name[len] = 0;

        switch (subtoken) {
        case PpAtomIdentifier:
            break;
        case PpAtomConstString:
            break;
        case PpAtomConstFloat:
        case PpAtomConstDouble:
        case PpAtomConstFloat16:
            ppToken->dval = atof(ppToken->name);
            break;
        case PpAtomConstInt:
#ifdef AMD_EXTENSIONS
        case PpAtomConstInt16:
#endif
            if (len > 0 && ppToken->name[0] == '0') {
                if (len > 1 && (ppToken->name[1] == 'x' || ppToken->name[1] == 'X'))
                    ppToken->ival = (int)strtol(ppToken->name, 0, 16);
                else
                    ppToken->ival = (int)strtol(ppToken->name, 0, 8);
            } else
                ppToken->ival = atoi(ppToken->name);
            break;
        case PpAtomConstUint:
#ifdef AMD_EXTENSIONS
        case PpAtomConstUint16:
#endif
            if (len > 0 && ppToken->name[0] == '0') {
                if (len > 1 && (ppToken->name[1] == 'x' || ppToken->name[1] == 'X'))
                    ppToken->ival = (int)strtoul(ppToken->name, 0, 16);
                else
                    ppToken->ival = (int)strtoul(ppToken->name, 0, 8);
            } else
                ppToken->ival = (int)strtoul(ppToken->name, 0, 10);
            break;
        case PpAtomConstInt64:
            if (len > 0 && ppToken->name[0] == '0') {
                if (len > 1 && (ppToken->name[1] == 'x' || ppToken->name[1] == 'X'))
                    ppToken->i64val = strtoll(ppToken->name, nullptr, 16);
                else
                    ppToken->i64val = strtoll(ppToken->name, nullptr, 8);
            } else
                ppToken->i64val = atoll(ppToken->name);
            break;
        case PpAtomConstUint64:
            if (len > 0 && ppToken->name[0] == '0') {
                if (len > 1 && (ppToken->name[1] == 'x' || ppToken->name[1] == 'X'))
                    ppToken->i64val = (long long)strtoull(ppToken->name, nullptr, 16);
                else
                    ppToken->i64val = (long long)strtoull(ppToken->name, nullptr, 8);
            } else
                ppToken->i64val = (long long)strtoull(ppToken->name, 0, 10);
            break;
        }
    }

    return subtoken;
}

// We are pasting if
//   1. we are preceding a pasting operator within this stream
// or
//   2. the entire macro is preceding a pasting operator (lastTokenPastes)
//      and we are also on the last token
bool TPpContext::TokenStream::peekTokenizedPasting(bool lastTokenPastes)
{
    // 1. preceding ##?

    size_t savePos = current;
    int subtoken;
    // skip white space
    do {
        subtoken = getSubtoken();
    } while (subtoken == ' ');
    current = savePos;
    if (subtoken == PpAtomPaste)
        return true;

    // 2. last token and we've been told after this there will be a ##

    if (! lastTokenPastes)
        return false;
    // Getting here means the last token will be pasted, after this

    // Are we at the last non-whitespace token?
    savePos = current;
    bool moreTokens = false;
    do {
        subtoken = getSubtoken();
        if (subtoken == EndOfInput)
            break;
        if (subtoken != ' ') {
            moreTokens = true;
            break;
        }
    } while (true);
    current = savePos;

    return !moreTokens;
}

// See if the next non-white-space tokens are two consecutive #
bool TPpContext::TokenStream::peekUntokenizedPasting()
{
    // don't return early, have to restore this
    size_t savePos = current;

    // skip white-space
    int subtoken;
    do {
        subtoken = getSubtoken();
    } while (subtoken == ' ');

    // check for ##
    bool pasting = false;
    if (subtoken == '#') {
        subtoken = getSubtoken();
        if (subtoken == '#')
            pasting = true;
    }

    current = savePos;

    return pasting;
}

void TPpContext::pushTokenStreamInput(TokenStream& ts, bool prepasting)
{
    pushInput(new tTokenInput(this, &ts, prepasting));
    ts.reset();
}

int TPpContext::tUngotTokenInput::scan(TPpToken* ppToken)
{
    if (done)
        return EndOfInput;

    int ret = token;
    *ppToken = lval;
    done = true;

    return ret;
}

void TPpContext::UngetToken(int token, TPpToken* ppToken)
{
    pushInput(new tUngotTokenInput(this, token, ppToken));
}

} // end namespace glslang