/** * This code handles decoding UTF strings for foreach loops. * * Copyright: Copyright Digital Mars 2004 - 2010. * License:   $(HTTP www.boost.org/LICENSE_1_0.txt, Boost License 1.0). * Authors:   Walter Bright * Source: $(DRUNTIMESRC rt/_aApply.d) */module rt.aApply; import core.internal.utf : decode, toUTF8; debug (apply) import core.stdc.stdio : printf; /**********************************************//* 1 argument versions */ /**Delegate type corresponding to transformed loop body The parameter is a pointer to the current `char`, `wchar` or `dchar` Returns: non-zero when a `break` statement is hit*/extern (D) alias dg_t = int delegate(void* c); // Note: dg is extern(D), but _aApplycd() is extern(C) /**Loop over a string while changing the UTF encoding There are 6 combinations of conversions between `char`, `wchar`, and `dchar`,and 2 of each of those. The naming convention is as follows: _aApply{c,d,w}{c,d,w}{1,2} The first letter corresponds to the input string encoding, and the second letter corresponds to the target character type. - c = `char`- w = `wchar`- d = `dchar` The `1` variant only produces the character, the `2` variant also produces a loop index. Examples:---void main(){    string str;    wtring wstr;    dstring dstr;     foreach (dchar c; str) {}    // _aApplycd1     foreach (wchar c; dstr) {}    // _aApplydw1     foreach (i, wchar c; str) {}    // _aApplycw2     foreach (wchar w; wstr) {}    // no conversion}--- Params:    aa = input string    dg = foreach body transformed into a delegate, similar to `opApply` Returns:    non-zero when the loop was exited through a `break`*/extern (C) int _aApplycd1(scope const(char)[] aa, dg_t dg){    int result;    size_t len = aa.length;     debug(apply) printf("_aApplycd1(), len = %zd\n", len);    for (size_t i = 0; i < len; )    {        dchar d = aa[i];        if (d & 0x80)            d = decode(aa, i);        else            ++i;        result = dg(cast(void *)&d);        if (result)            break;    }    return result;} unittest{    debug(apply) printf("_aApplycd1.unittest\n");     auto s = "hello"c[];    int i;     foreach (dchar d; s)    {        switch (i)        {            case 0:     assert(d == 'h'); break;            case 1:     assert(d == 'e'); break;            case 2:     assert(d == 'l'); break;            case 3:     assert(d == 'l'); break;            case 4:     assert(d == 'o'); break;            default:    assert(0);        }        i++;    }    assert(i == 5);     s = "a\u1234\U000A0456b";    i = 0;    foreach (dchar d; s)    {        //printf("i = %d, d = %x\n", i, d);        switch (i)        {            case 0:     assert(d == 'a'); break;            case 1:     assert(d == '\u1234'); break;            case 2:     assert(d == '\U000A0456'); break;            case 3:     assert(d == 'b'); break;            default:    assert(0);        }        i++;    }    assert(i == 4);} /// dittoextern (C) int _aApplywd1(scope const(wchar)[] aa, dg_t dg){    int result;    size_t len = aa.length;     debug(apply) printf("_aApplywd1(), len = %zd\n", len);    for (size_t i = 0; i < len; )    {        dchar d = aa[i];        if (d >= 0xD800)            d = decode(aa, i);        else            ++i;        result = dg(cast(void *)&d);        if (result)            break;    }    return result;} unittest{    debug(apply) printf("_aApplywd1.unittest\n");     auto s = "hello"w[];    int i;     foreach (dchar d; s)    {        switch (i)        {            case 0:     assert(d == 'h'); break;            case 1:     assert(d == 'e'); break;            case 2:     assert(d == 'l'); break;            case 3:     assert(d == 'l'); break;            case 4:     assert(d == 'o'); break;            default:    assert(0);        }        i++;    }    assert(i == 5);     s = "a\u1234\U000A0456b";    i = 0;    foreach (dchar d; s)    {        //printf("i = %d, d = %x\n", i, d);        switch (i)        {            case 0:     assert(d == 'a'); break;            case 1:     assert(d == '\u1234'); break;            case 2:     assert(d == '\U000A0456'); break;            case 3:     assert(d == 'b'); break;            default:    assert(0);        }        i++;    }    assert(i == 4);} /// dittoextern (C) int _aApplycw1(scope const(char)[] aa, dg_t dg){    int result;    size_t len = aa.length;     debug(apply) printf("_aApplycw1(), len = %zd\n", len);    for (size_t i = 0; i < len; )    {        wchar w = aa[i];        if (w & 0x80)        {            dchar d = decode(aa, i);            if (d <= 0xFFFF)                w = cast(wchar) d;            else            {                w = cast(wchar)((((d - 0x10000) >> 10) & 0x3FF) + 0xD800);                result = dg(cast(void *)&w);                if (result)                    break;                w = cast(wchar)(((d - 0x10000) & 0x3FF) + 0xDC00);            }        }        else            ++i;        result = dg(cast(void *)&w);        if (result)            break;    }    return result;} unittest{    debug(apply) printf("_aApplycw1.unittest\n");     auto s = "hello"c[];    int i;     foreach (wchar d; s)    {        switch (i)        {            case 0:     assert(d == 'h'); break;            case 1:     assert(d == 'e'); break;            case 2:     assert(d == 'l'); break;            case 3:     assert(d == 'l'); break;            case 4:     assert(d == 'o'); break;            default:    assert(0);        }        i++;    }    assert(i == 5);     s = "a\u1234\U000A0456b";    i = 0;    foreach (wchar d; s)    {        //printf("i = %d, d = %x\n", i, d);        switch (i)        {            case 0:     assert(d == 'a'); break;            case 1:     assert(d == 0x1234); break;            case 2:     assert(d == 0xDA41); break;            case 3:     assert(d == 0xDC56); break;            case 4:     assert(d == 'b'); break;            default:    assert(0);        }        i++;    }    assert(i == 5);} /// dittoextern (C) int _aApplywc1(scope const(wchar)[] aa, dg_t dg){    int result;    size_t len = aa.length;     debug(apply) printf("_aApplywc1(), len = %zd\n", len);    for (size_t i = 0; i < len; )    {        wchar w = aa[i];        if (w & ~0x7F)        {            char[4] buf = void;             dchar d = decode(aa, i);            auto b = toUTF8(buf, d);            foreach (char c2; b)            {                result = dg(cast(void *)&c2);                if (result)                    return result;            }        }        else        {            char c = cast(char)w;            ++i;            result = dg(cast(void *)&c);            if (result)                break;        }    }    return result;} unittest{    debug(apply) printf("_aApplywc1.unittest\n");     auto s = "hello"w[];    int i;     foreach (char d; s)    {        switch (i)        {            case 0:     assert(d == 'h'); break;            case 1:     assert(d == 'e'); break;            case 2:     assert(d == 'l'); break;            case 3:     assert(d == 'l'); break;            case 4:     assert(d == 'o'); break;            default:    assert(0);        }        i++;    }    assert(i == 5);     s = "a\u1234\U000A0456b";    i = 0;    foreach (char d; s)    {        //printf("i = %d, d = %x\n", i, d);        switch (i)        {            case 0:     assert(d == 'a'); break;            case 1:     assert(d == 0xE1); break;            case 2:     assert(d == 0x88); break;            case 3:     assert(d == 0xB4); break;            case 4:     assert(d == 0xF2); break;            case 5:     assert(d == 0xA0); break;            case 6:     assert(d == 0x91); break;            case 7:     assert(d == 0x96); break;            case 8:     assert(d == 'b'); break;            default:    assert(0);        }        i++;    }    assert(i == 9);} /// dittoextern (C) int _aApplydc1(scope const(dchar)[] aa, dg_t dg){    int result;     debug(apply) printf("_aApplydc1(), len = %zd\n", aa.length);    foreach (dchar d; aa)    {        if (d & ~0x7F)        {            char[4] buf = void;             auto b = toUTF8(buf, d);            foreach (char c2; b)            {                result = dg(cast(void *)&c2);                if (result)                    return result;            }        }        else        {            char c = cast(char)d;            result = dg(cast(void *)&c);            if (result)                break;        }    }    return result;} unittest{    debug(apply) printf("_aApplyRdc1.unittest\n");     auto s = "hello"d[];    int i;     foreach (char d; s)    {        switch (i)        {            case 0:     assert(d == 'h'); break;            case 1:     assert(d == 'e'); break;            case 2:     assert(d == 'l'); break;            case 3:     assert(d == 'l'); break;            case 4:     assert(d == 'o'); break;            default:    assert(0);        }        i++;    }    assert(i == 5);     s = "a\u1234\U000A0456b";    i = 0;    foreach (char d; s)    {        //printf("i = %d, d = %x\n", i, d);        switch (i)        {            case 0:     assert(d == 'a'); break;            case 1:     assert(d == 0xE1); break;            case 2:     assert(d == 0x88); break;            case 3:     assert(d == 0xB4); break;            case 4:     assert(d == 0xF2); break;            case 5:     assert(d == 0xA0); break;            case 6:     assert(d == 0x91); break;            case 7:     assert(d == 0x96); break;            case 8:     assert(d == 'b'); break;            default:    assert(0);        }        i++;    }    assert(i == 9);} /// dittoextern (C) int _aApplydw1(scope const(dchar)[] aa, dg_t dg){    int result;     debug(apply) printf("_aApplydw1(), len = %zd\n", aa.length);    foreach (dchar d; aa)    {        wchar w;         if (d <= 0xFFFF)            w = cast(wchar) d;        else        {            w = cast(wchar)((((d - 0x10000) >> 10) & 0x3FF) + 0xD800);            result = dg(cast(void *)&w);            if (result)                break;            w = cast(wchar)(((d - 0x10000) & 0x3FF) + 0xDC00);        }        result = dg(cast(void *)&w);        if (result)            break;    }    return result;} unittest{    debug(apply) printf("_aApplydw1.unittest\n");     auto s = "hello"d[];    int i;     foreach (wchar d; s)    {        switch (i)        {            case 0:     assert(d == 'h'); break;            case 1:     assert(d == 'e'); break;            case 2:     assert(d == 'l'); break;            case 3:     assert(d == 'l'); break;            case 4:     assert(d == 'o'); break;            default:    assert(0);        }        i++;    }    assert(i == 5);     s = "a\u1234\U000A0456b";    i = 0;    foreach (wchar d; s)    {        //printf("i = %d, d = %x\n", i, d);        switch (i)        {            case 0:     assert(d == 'a'); break;            case 1:     assert(d == 0x1234); break;            case 2:     assert(d == 0xDA41); break;            case 3:     assert(d == 0xDC56); break;            case 4:     assert(d == 'b'); break;            default:    assert(0);        }        i++;    }    assert(i == 5);}  /****************************************************************************//* 2 argument versions */ /**Delegate type corresponding to transformed loop body

Lines 1–500 of 960. Load more