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// tokens.c
//

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>

#include "slglobals.h"

///////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////// Preprocessor and Token Recorder and Playback: ////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////

/*
 * idstr()
 * Copy a string to a malloc'ed block and convert it into something suitable
 * for an ID
 *
 */

char *idstr(const char *fstr)
{
    size_t len;
    char *str, *t;
    const char *f;

    len = strlen(fstr);
    str = (char *) malloc(len + 1);
    for (f=fstr, t=str; *f; f++) {
        if (isalnum(*f)) *t++ = *f;
        else if (*f == '.' || *f == '/') *t++ = '_';
    }
    *t = 0;
    return str;
} // idstr

/*
 * lCompressToken() -  Rename a token so that most will fit in one byte.
 *
 */

static int lCompressToken(int token)
{
    return token;
} // lCompressToken

/*
 * lExpandToken() -  Expand a token into what the scanner wants.
 *
 */

static int lExpandToken(int token)
{
    return token;
} // lExpandToken

/*
 * lNewBlock()
 *
 */

static TokenBlock *lNewBlock(TokenStream *fTok)
{
    TokenBlock *lBlock;

    lBlock = (TokenBlock *) malloc(sizeof(TokenBlock) + 256);
    lBlock->count = 0;
    lBlock->current = 0;
    lBlock->data = (unsigned char *) lBlock + sizeof(TokenBlock);
    lBlock->max = 256;
    lBlock->next = NULL;
    if (fTok->head) {
        fTok->current->next = lBlock;
    } else {
        fTok->head = lBlock;
    }
    fTok->current = lBlock;
    return lBlock;
} // lNewBlock

/*
 * lAddByte()
 *
 */

static void lAddByte(TokenStream *fTok, unsigned char fVal)
{
    TokenBlock *lBlock;

    lBlock = fTok->current;
    if (lBlock->count >= lBlock->max)
        lBlock = lNewBlock(fTok);
    lBlock->data[lBlock->count++] = fVal;
} // lAddByte

/*
 * lAdd4Bytes()
 *
 */

static void lAdd4Bytes(TokenStream *fTok, unsigned char *fVal)
{
    TokenBlock *lBlock;
    unsigned char *pc;

    lBlock = fTok->current;
    if (lBlock->count + 4 > lBlock->max)
        lBlock = lNewBlock(fTok);
    pc = &lBlock->data[lBlock->count];
    lBlock->count += 4;
    pc[0] = fVal[0];
    pc[1] = fVal[1];
    pc[2] = fVal[2];
    pc[3] = fVal[3];
} // lAdd4Bytes

/*
 * lReadByte() - Get the next byte from a stream.
 *
 */

static int lReadByte(TokenStream *pTok)
{
    TokenBlock *lBlock;
    int lval = -1;

    lBlock = pTok->current;
    if (lBlock) {
        if (lBlock->current >= lBlock->count) {
            lBlock = lBlock->next;
            if (lBlock)
                lBlock->current = 0;
            pTok->current = lBlock;
        }
        if (lBlock)
            lval = lBlock->data[lBlock->current++];
    }
    return lval;
} // lReadByte

/*
 * lRead4Bytes()
 *
 */

static void lRead4Bytes(TokenStream *fTok, unsigned char *fVal)
{
    fVal[0] = (unsigned char ) lReadByte(fTok);
    fVal[1] = (unsigned char ) lReadByte(fTok);
    fVal[2] = (unsigned char ) lReadByte(fTok);
    fVal[3] = (unsigned char ) lReadByte(fTok);
} // lRead4Bytes

/////////////////////////////////////// Global Functions://////////////////////////////////////

/*
 * InitTokenStreams()
 *
 */

int InitTokenStreams(CgStruct *Cg)
{
    return 1;
} // InitTokenStreams

/*
 * NewTokenStream()
 *
 */

TokenStream *NewTokenStream(const char *name)
{
    TokenStream *pTok;

    pTok = (TokenStream *) malloc(sizeof(TokenStream));
    pTok->next = NULL;
    pTok->name = idstr(name);
    pTok->head = NULL;
    pTok->current = NULL;
    lNewBlock(pTok);
    return pTok;
} // NewTokenStream

/*
 * DeleteTokenStream()
 *
 */

void DeleteTokenStream(TokenStream *pTok)
{
    TokenBlock *pBlock, *nBlock;

    if (pTok) {
        pBlock = pTok->head;
        while (pBlock) {
            nBlock = pBlock->next;
            free(pBlock);
            pBlock = nBlock;
        }
        if (pTok->name)
            free(pTok->name);
        free(pTok);
    }
} // DeleteTokenStream

/*
 * RecordToken() - Add a token to the end of a list for later playback or printout.
 *
 */

void RecordToken(TokenStream *pTok, int token)
{
    const char *s;

    // token = lCompressToken(token);
    if (token > 256)
        lAddByte(pTok, (unsigned char)((token & 0x7f) + 0x80));
    else
        lAddByte(pTok, (unsigned char)(token & 0x7f));
    switch (token) {
    case IDENT_SY:
    case TYPEIDENT_SY:
    case STRCONST_SY:
        s = GetAtomString(atable, yylval.sc_ident);
        while (*s)
            lAddByte(pTok, (unsigned char) *s++);
        lAddByte(pTok, 0);
        break;
    case CFLOATCONST_SY:
    case FLOATCONST_SY:
    case FLOATHCONST_SY:
    case FLOATXCONST_SY:
        lAdd4Bytes(pTok, (unsigned char *) &yylval.sc_fval);
        break;
    case INTCONST_SY:
        lAdd4Bytes(pTok, (unsigned char *) &yylval.sc_int);
        break;
    case '(':