sqstdstring.cpp

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/* see copyright notice in squirrel.h */
#include <squirrel.h>
#include <sqstdstring.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <assert.h>

#ifdef SQUNICODE
#define scstrchr wcschr
#define scsnprintf wsnprintf
#define scatoi _wtoi
#define scstrtok wcstok
#else
#define scstrchr strchr
#define scsnprintf snprintf
#define scatoi atoi
#define scstrtok strtok
#endif
#define MAX_FORMAT_LEN  20
#define MAX_WFORMAT_LEN 3
#define ADDITIONAL_FORMAT_SPACE (100*sizeof(SQChar))

static SQInteger validate_format(HSQUIRRELVM v, SQChar *fmt, const SQChar *src, SQInteger n,SQInteger &width)
{
    SQChar swidth[MAX_WFORMAT_LEN];
    SQInteger wc = 0;
    SQInteger start = n;
    fmt[0] = '%';
    while (scstrchr(_SC("-+ #0"), src[n])) n++;
    while (scisdigit(src[n])) {
        swidth[wc] = src[n];
        n++;
        wc++;
        if(wc>=MAX_WFORMAT_LEN)
            return sq_throwerror(v,_SC("width format too long"));
    }
    swidth[wc] = '\0';
    if(wc > 0) {
        width = scatoi(swidth);
    }
    else
        width = 0;
    if (src[n] == '.') {
        n++;

        wc = 0;
        while (scisdigit(src[n])) {
            swidth[wc] = src[n];
            n++;
            wc++;
            if(wc>=MAX_WFORMAT_LEN)
                return sq_throwerror(v,_SC("precision format too long"));
        }
        swidth[wc] = '\0';
        if(wc > 0) {
            width += scatoi(swidth);
        }
    }
    if (n-start > MAX_FORMAT_LEN )
        return sq_throwerror(v,_SC("format too long"));
    memcpy(&fmt[1],&src[start],((n-start)+1)*sizeof(SQChar));
    fmt[(n-start)+2] = '\0';
    return n;
}


SQRESULT sqstd_format(HSQUIRRELVM v,SQInteger nformatstringidx,SQInteger *outlen,SQChar **output)
{
    const SQChar *format;
    SQChar *dest;
    SQChar fmt[MAX_FORMAT_LEN];
    sq_getstring(v,nformatstringidx,&format);
    SQInteger allocated = (sq_getsize(v,nformatstringidx)+2)*sizeof(SQChar);
    dest = sq_getscratchpad(v,allocated);
    SQInteger n = 0,i = 0, nparam = nformatstringidx+1, w = 0;
    while(format[n] != '\0') {
        if(format[n] != '%') {
            assert(i < allocated);
            dest[i++] = format[n];
            n++;
        }
        else if(format[n+1] == '%') { //handles %%
                dest[i++] = '%';
                n += 2;
        }
        else {
            n++;
            if( nparam > sq_gettop(v) )
                // C::B patch: Correct misspelled "parameters"
                return sq_throwerror(v,_SC("not enough parameters for the given format string"));
            n = validate_format(v,fmt,format,n,w);
            if(n < 0) return -1;
            SQInteger addlen = 0;
            SQInteger valtype = 0;
            const SQChar *ts;
            SQInteger ti;
            SQFloat tf;
            switch(format[n]) {
            case 's':
                if(SQ_FAILED(sq_getstring(v,nparam,&ts)))
                    return sq_throwerror(v,_SC("string expected for the specified format"));
                addlen = (sq_getsize(v,nparam)*sizeof(SQChar))+((w+1)*sizeof(SQChar));
                valtype = 's';
                break;
            case 'i': case 'd': case 'c':case 'o':  case 'u':  case 'x':  case 'X':
                if(SQ_FAILED(sq_getinteger(v,nparam,&ti)))
                    return sq_throwerror(v,_SC("integer expected for the specified format"));
                addlen = (ADDITIONAL_FORMAT_SPACE)+((w+1)*sizeof(SQChar));
                valtype = 'i';
                break;
            case 'f': case 'g': case 'G': case 'e':  case 'E':
                if(SQ_FAILED(sq_getfloat(v,nparam,&tf)))
                    return sq_throwerror(v,_SC("float expected for the specified format"));
                addlen = (ADDITIONAL_FORMAT_SPACE)+((w+1)*sizeof(SQChar));
                valtype = 'f';
                break;
            default:
                return sq_throwerror(v,_SC("invalid format"));
            }
            n++;
            allocated += addlen + sizeof(SQChar);
            dest = sq_getscratchpad(v,allocated);
            switch(valtype) {
            case 's': i += scsprintf(&dest[i],fmt,ts); break;
            case 'i': i += scsprintf(&dest[i],fmt,ti); break;
            case 'f': i += scsprintf(&dest[i],fmt,tf); break;
            };
            nparam ++;
        }
    }
    *outlen = i;
    dest[i] = '\0';
    *output = dest;
    return SQ_OK;
}

static SQInteger _string_format(HSQUIRRELVM v)
{
    SQChar *dest = NULL;
    SQInteger length = 0;
    if(SQ_FAILED(sqstd_format(v,2,&length,&dest)))
        return -1;
    sq_pushstring(v,dest,length);
    return 1;
}

static void __strip_l(const SQChar *str,const SQChar **start)
{
    const SQChar *t = str;
    while(((*t) != '\0') && scisspace(*t)){ t++; }
    *start = t;
}

static void __strip_r(const SQChar *str,SQInteger len,const SQChar **end)
{
    if(len == 0) {
        *end = str;
        return;
    }
    const SQChar *t = &str[len-1];
    while(t != str && scisspace(*t)) { t--; }
    *end = t+1;
}

static SQInteger _string_strip(HSQUIRRELVM v)
{
    const SQChar *str,*start,*end;
    sq_getstring(v,2,&str);
    SQInteger len = sq_getsize(v,2);
    __strip_l(str,&start);
    __strip_r(str,len,&end);
    sq_pushstring(v,start,end - start);
    return 1;
}

static SQInteger _string_lstrip(HSQUIRRELVM v)
{
    const SQChar *str,*start;
    sq_getstring(v,2,&str);
    __strip_l(str,&start);
    sq_pushstring(v,start,-1);
    return 1;
}

static SQInteger _string_rstrip(HSQUIRRELVM v)
{
    const SQChar *str,*end;
    sq_getstring(v,2,&str);
    SQInteger len = sq_getsize(v,2);
    __strip_r(str,len,&end);
    sq_pushstring(v,str,end - str);
    return 1;
}

static SQInteger _string_split(HSQUIRRELVM v)
{
    const SQChar *str,*seps;
    SQChar *stemp,*tok;
    sq_getstring(v,2,&str);
    sq_getstring(v,3,&seps);
    if(sq_getsize(v,3) == 0) return sq_throwerror(v,_SC("empty separators string"));
    SQInteger memsize = (sq_getsize(v,2)+1)*sizeof(SQChar);
    stemp = sq_getscratchpad(v,memsize);
    memcpy(stemp,str,memsize);
    tok = scstrtok(stemp,seps);
    sq_newarray(v,0);
    while( tok != NULL ) {
        sq_pushstring(v,tok,-1);
        sq_arrayappend(v,-2);
        tok = scstrtok( NULL, seps );
    }
    return 1;
}

#define SETUP_REX(v) \
    SQRex *self = NULL; \
    sq_getinstanceup(v,1,(SQUserPointer *)&self,0);

// C::B patch: Make the compiler happy by commenting unused variables
static SQInteger _rexobj_releasehook(SQUserPointer p, SQInteger /*size*/)
{
    SQRex *self = ((SQRex *)p);
    sqstd_rex_free(self);
    return 1;
}

static SQInteger _regexp_match(HSQUIRRELVM v)
{
    SETUP_REX(v);
    const SQChar *str;
    sq_getstring(v,2,&str);
    if(sqstd_rex_match(self,str) == SQTrue)
    {
        sq_pushbool(v,SQTrue);
        return 1;
    }
    sq_pushbool(v,SQFalse);
    return 1;
}

static void _addrexmatch(HSQUIRRELVM v,const SQChar *str,const SQChar *begin,const SQChar *end)
{
    sq_newtable(v);
    sq_pushstring(v,_SC("begin"),-1);
    sq_pushinteger(v,begin - str);
    sq_rawset(v,-3);
    sq_pushstring(v,_SC("end"),-1);
    sq_pushinteger(v,end - str);
    sq_rawset(v,-3);
}

static SQInteger _regexp_search(HSQUIRRELVM v)
{
    SETUP_REX(v);
    const SQChar *str,*begin,*end;
    SQInteger start = 0;
    sq_getstring(v,2,&str);
    if(sq_gettop(v) > 2) sq_getinteger(v,3,&start);
    if(sqstd_rex_search(self,str+start,&begin,&end) == SQTrue) {
        _addrexmatch(v,str,begin,end);
        return 1;
    }
    return 0;
}

static SQInteger _regexp_capture(HSQUIRRELVM v)
{
    SETUP_REX(v);
    const SQChar *str,*begin,*end;
    SQInteger start = 0;
    sq_getstring(v,2,&str);
    if(sq_gettop(v) > 2) sq_getinteger(v,3,&start);
    if(sqstd_rex_search(self,str+start,&begin,&end) == SQTrue) {
        SQInteger n = sqstd_rex_getsubexpcount(self);
        SQRexMatch match;
        sq_newarray(v,0);
        for(SQInteger i = 0;i < n; i++) {
            sqstd_rex_getsubexp(self,i,&match);
            if(match.len > 0)
                _addrexmatch(v,str,match.begin,match.begin+match.len);
            else
                _addrexmatch(v,str,str,str); //empty match
            sq_arrayappend(v,-2);
        }
        return 1;
    }
    return 0;
}

static SQInteger _regexp_subexpcount(HSQUIRRELVM v)
{
    SETUP_REX(v);
    sq_pushinteger(v,sqstd_rex_getsubexpcount(self));
    return 1;
}

static SQInteger _regexp_constructor(HSQUIRRELVM v)
{
    const SQChar *error,*pattern;
    sq_getstring(v,2,&pattern);
    SQRex *rex = sqstd_rex_compile(pattern,&error);
    if(!rex) return sq_throwerror(v,error);
    sq_setinstanceup(v,1,rex);
    sq_setreleasehook(v,1,_rexobj_releasehook);
    return 0;
}

static SQInteger _regexp__typeof(HSQUIRRELVM v)
{
    sq_pushstring(v,_SC("regexp"),-1);
    return 1;
}

#define _DECL_REX_FUNC(name,nparams,pmask) {_SC(#name),_regexp_##name,nparams,pmask}
static SQRegFunction rexobj_funcs[]={
    _DECL_REX_FUNC(constructor,2,_SC(".s")),
    _DECL_REX_FUNC(search,-2,_SC("xsn")),
    _DECL_REX_FUNC(match,2,_SC("xs")),
    _DECL_REX_FUNC(capture,-2,_SC("xsn")),
    _DECL_REX_FUNC(subexpcount,1,_SC("x")),
    _DECL_REX_FUNC(_typeof,1,_SC("x")),
    {0,0}
};

#define _DECL_FUNC(name,nparams,pmask) {_SC(#name),_string_##name,nparams,pmask}
static SQRegFunction stringlib_funcs[]={
    _DECL_FUNC(format,-2,_SC(".s")),
    _DECL_FUNC(strip,2,_SC(".s")),
    _DECL_FUNC(lstrip,2,_SC(".s")),
    _DECL_FUNC(rstrip,2,_SC(".s")),
    _DECL_FUNC(split,3,_SC(".ss")),
    {0,0}
};


SQInteger sqstd_register_stringlib(HSQUIRRELVM v)
{
    sq_pushstring(v,_SC("regexp"),-1);
    sq_newclass(v,SQFalse);
    SQInteger i = 0;
    while(rexobj_funcs[i].name != 0) {
        SQRegFunction &f = rexobj_funcs[i];
        sq_pushstring(v,f.name,-1);
        sq_newclosure(v,f.f,0);
        sq_setparamscheck(v,f.nparamscheck,f.typemask);
        sq_setnativeclosurename(v,-1,f.name);
        sq_createslot(v,-3);
        i++;
    }
    sq_createslot(v,-3);

    i = 0;
    while(stringlib_funcs[i].name!=0)
    {
        sq_pushstring(v,stringlib_funcs[i].name,-1);
        sq_newclosure(v,stringlib_funcs[i].f,0);
        sq_setparamscheck(v,stringlib_funcs[i].nparamscheck,stringlib_funcs[i].typemask);
        sq_setnativeclosurename(v,-1,stringlib_funcs[i].name);
        sq_createslot(v,-3);
        i++;
    }
    return 1;
}