Check format specifier at compile time
This commit is contained in:
parent
72d5760589
commit
f334e6a1a0
@ -225,7 +225,7 @@ private void raise2Power10(double* ohi,
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* of the decimal point in decimalPos. +/-Inf and NaN are specified by special
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* values returned in the decimalPos parameter.
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* fracDigits is absolute normally, but if you want from first significant
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* digits (got %g and %e), or in 0x80000000
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* digits (got %g), or in 0x80000000
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*/
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private int real2String(ref const(char)* start,
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ref uint len,
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@ -425,24 +425,17 @@ private int real2String(ref const(char)* start,
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return ng;
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}
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private void leadSign(uint fl, char* sign)
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private void leadSign(bool negative, ref char[8] sign)
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pure nothrow @nogc
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{
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sign[0] = 0;
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if (fl & Modifier.negative)
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if (negative)
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{
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sign[0] = 1;
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sign[1] = '-';
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}
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}
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private enum Modifier : uint
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{
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intMax = 32,
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negative = 128,
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halfWidth = 512,
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}
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// Copies d to bits w/ strict aliasing (this compiles to nothing on /Ox).
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private void copyFp(T, U)(ref T dest, ref U src)
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{
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@ -471,134 +464,19 @@ private void ddmulthi(ref double oh,
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ol = ((ahi * bhi - oh) + ahi * blo + alo * bhi) + alo * blo;
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}
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/*
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* Get float info.
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*
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* Returns: Sign bit.
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*/
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private int real2Parts(long* bits, out int exponent, const double value)
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pure nothrow @nogc
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{
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long b;
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// Load value and round at the fracDigits.
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double d = value;
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copyFp(b, d);
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*bits = b & (((cast(ulong) 1) << 52) - 1);
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// 1023 is the exponent bias, calculated as 2^(k - 1) - 1, where k is the
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// number of bits used to represent the exponent, 11 bit for double.
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exponent = cast(int) (((b >> 52) & 0x7ff) - 1023);
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return cast(int) (b >> 63);
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}
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private char[] vsprintf(string fmt)(return char[] buf, va_list va)
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private char[] vsprintf(string fmt, Args...)(return char[] buf, va_list va)
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pure nothrow @nogc
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{
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char* bf = buf.ptr;
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string f = fmt;
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int tlen;
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FmtLoop: while (true)
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{
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// Fast copy everything up to the next % (or end of string).
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while ((cast(size_t) f.ptr) & 3)
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{
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schk:
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if (f.length == 0)
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{
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break FmtLoop;
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}
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if (f[0] == '%')
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{
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goto scandd;
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}
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*bf++ = f[0];
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f.popFront();
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}
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while (true)
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{
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// Check if the next 4 bytes contain %(0x25) or end of string.
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// Using the 'hasless' trick:
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// https://graphics.stanford.edu/~seander/bithacks.html#HasLessInWord
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uint v = *cast(uint*) f;
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uint c = (~v) & 0x80808080;
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if ((((v ^ 0x25252525) - 0x01010101) & c) || f.length <= 3)
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{
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goto schk;
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}
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*cast(uint*) bf = v;
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bf += 4;
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f = f[4 .. $];
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}
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scandd:
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f.popFront();
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// Ok, we have a percent, read the modifiers first.
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int fw = 0;
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int precision = -1;
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int tz = 0;
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uint fl = 0;
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// Get the field width.
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if (f[0] == '*')
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{
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fw = va_arg!uint(va);
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f.popFront();
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}
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else
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{
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while ((f[0] >= '0') && (f[0] <= '9'))
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{
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fw = fw * 10 + f[0] - '0';
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f.popFront();
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}
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}
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// Get the precision.
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if (f[0] == '.')
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{
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f.popFront();
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if (f[0] == '*')
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{
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precision = va_arg!uint(va);
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f.popFront();
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}
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else
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{
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precision = 0;
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while ((f[0] >= '0') && (f[0] <= '9'))
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{
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precision = precision * 10 + f[0] - '0';
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f.popFront();
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}
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}
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}
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// Handle integer size overrides.
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switch (f[0])
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{
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// are we halfwidth?
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case 'h':
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fl |= Modifier.halfWidth;
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f.popFront();
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break;
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// are we 64-bit?
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case 'l':
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fl |= Modifier.intMax;
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f.popFront();
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break;
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default:
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break;
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}
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bool negative;
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// Handle each replacement.
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enum NUMSZ = 512; // Big enough for e308 (with commas) or e-307.
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char[NUMSZ] num;
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char[512] num; // Big enough for e308 (with commas) or e-307.
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char[8] lead;
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char[8] tail;
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char *s;
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@ -610,9 +488,8 @@ pure nothrow @nogc
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int decimalPos;
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const(char)* sn;
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switch (f[0])
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static if (fmt[0] == 's') // String
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{
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case 's':
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// Get the string.
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s = va_arg!(char[])(va).ptr;
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if (s is null)
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@ -635,15 +512,6 @@ pure nothrow @nogc
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++sn;
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}
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n = 0xffffffff;
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if (precision >= 0)
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{
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n = cast(uint) (sn - s);
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if (n >= cast(uint) precision)
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{
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goto ld;
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}
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n = (cast(uint) (precision - n)) >> 2;
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}
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while (n)
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{
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uint v = *cast(uint*) sn;
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@ -655,33 +523,29 @@ pure nothrow @nogc
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--n;
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}
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goto lchk;
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ld:
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ld:
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l = cast(uint) (sn - s);
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// Clamp to precision.
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if (l > cast(uint) precision)
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{
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l = precision;
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}
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lead[0] = 0;
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tail[0] = 0;
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precision = 0;
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decimalPos = 0;
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// Copy the string in.
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goto scopy;
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case 'c': // Char.
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}
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else static if (fmt[0] == 'c') // Char
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{
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// Get the character.
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s = num.ptr + NUMSZ - 1;
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s = num.ptr + num.length - 1;
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*s = cast(char) va_arg!int(va);
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l = 1;
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lead[0] = 0;
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tail[0] = 0;
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precision = 0;
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decimalPos = 0;
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goto scopy;
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case 'g': // Float.
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}
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else static if (fmt[0] == 'g') // Float
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{
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fv = va_arg!double(va);
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if (precision == -1)
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{
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@ -699,7 +563,7 @@ pure nothrow @nogc
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fv,
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(precision - 1) | 0x80000000))
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{
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fl |= Modifier.negative;
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negative = true;
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}
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// Clamp the precision and delete extra zeros after clamp.
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@ -747,25 +611,9 @@ pure nothrow @nogc
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}
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goto dofloatfromg;
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case 'e': // Float.
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fv = va_arg!double(va);
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if (precision == -1)
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{
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precision = 6; // Default is 6.
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}
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// read the double into a string
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if (real2String(sn,
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l,
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num.ptr,
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decimalPos,
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fv,
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precision | 0x80000000))
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{
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fl |= Modifier.negative;
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}
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doexpfromg:
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tail[0] = 0;
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leadSign(fl, lead.ptr);
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leadSign(negative, lead);
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if (decimalPos == special)
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{
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s = cast(char*) sn;
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@ -821,21 +669,9 @@ pure nothrow @nogc
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}
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goto flt_lead;
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case 'f': // Float.
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fv = va_arg!double(va);
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doafloat:
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if (precision == -1)
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{
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precision = 6; // Default is 6.
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}
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// Read the double into a string.
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if (real2String(sn, l, num.ptr, decimalPos, fv, precision))
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{
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fl |= Modifier.negative;
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}
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dofloatfromg:
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tail[0] = 0;
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leadSign(fl, lead.ptr);
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leadSign(negative, lead);
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if (decimalPos == special)
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{
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s = cast(char*) sn;
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@ -971,21 +807,16 @@ pure nothrow @nogc
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// Get the length that we copied.
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l = cast(uint) (s - (num.ptr + 64));
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s = num.ptr + 64;
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goto scopy;
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case 'p': // Pointer
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static if (size_t.sizeof == 8)
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{
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fl |= Modifier.intMax;
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}
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else static if (fmt[0] == 'p') // Pointer
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{
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l = (4 << 4) | (4 << 8);
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lead[0] = 2;
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lead[1] = '0';
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lead[2] = 'x';
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radixnum:
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// Get the number.
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if (fl & Modifier.intMax)
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static if (size_t.sizeof == 8)
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{
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n64 = va_arg!ulong(va);
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}
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@ -994,60 +825,53 @@ pure nothrow @nogc
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n64 = va_arg!uint(va);
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}
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s = num.ptr + NUMSZ;
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s = num.ptr + num.length;
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decimalPos = 0;
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// Clear tail, and clear leading if value is zero.
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tail[0] = 0;
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if (n64 == 0)
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{
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lead[0] = 0;
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if (precision == 0)
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{
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l = 0;
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goto scopy;
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}
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}
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// Convert to string.
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for (;;)
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{
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*--s = hex[cast(size_t) (n64 & ((1 << (l >> 8)) - 1))];
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n64 >>= (l >> 8);
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if (!((n64) || (cast(int) ((num.ptr + NUMSZ) - s) < precision)))
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n64 >>= l >> 8;
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if (n64 == 0)
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{
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break;
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}
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}
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// Get the length that we copied.
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l = cast(uint)((num.ptr + NUMSZ) - s);
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// Copy it.
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goto scopy;
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case 'u': // Unsigned.
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case 'i': // Signed.
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l = cast(uint)((num.ptr + num.length) - s);
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}
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else static if (fmt[0] == 'u' || fmt[0] == 'i' || fmt[0] == 'l') // Integer
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{
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// Get the integer and abs it.
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if (fl & Modifier.intMax)
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if (fmt[0] == 'l')
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{
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long i64 = va_arg!long(va);
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n64 = cast(ulong) i64;
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if ((f[0] != 'u') && (i64 < 0))
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if ((fmt[0] != 'u') && (i64 < 0))
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{
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n64 = cast(ulong) -i64;
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fl |= Modifier.negative;
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negative = true;
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}
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}
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else
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{
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int i = va_arg!int(va);
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n64 = cast(uint) i;
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if ((f[0] != 'u') && (i < 0))
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if ((fmt[0] != 'u') && (i < 0))
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{
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n64 = cast(uint) -i;
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fl |= Modifier.negative;
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negative = true;
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}
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}
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// Convert to string.
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s = num.ptr + NUMSZ;
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s = num.ptr + num.length;
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l = 0;
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for (;;)
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@ -1078,7 +902,7 @@ pure nothrow @nogc
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}
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if (n64 == 0)
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{
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if ((s[0] == '0') && (s != (num.ptr + NUMSZ)))
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if ((s[0] == '0') && (s != (num.ptr + num.length)))
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{
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++s;
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}
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@ -1091,10 +915,10 @@ pure nothrow @nogc
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}
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tail[0] = 0;
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leadSign(fl, lead.ptr);
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leadSign(negative, lead);
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// Get the length that we copied.
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l = cast(uint) ((num.ptr + NUMSZ) - s);
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l = cast(uint) ((num.ptr + num.length) - s);
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if (l == 0)
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{
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*--s = '0';
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@ -1104,6 +928,11 @@ pure nothrow @nogc
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{
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precision = 0;
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}
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}
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else
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{
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static assert(false);
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}
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scopy:
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// Get fw=leading/trailing space, precision=leading zeros.
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@ -1112,45 +941,13 @@ pure nothrow @nogc
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precision = l;
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}
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n = precision + lead[0] + tail[0] + tz;
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if (fw < cast(int) n)
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{
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fw = n;
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}
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fw -= n;
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precision -= l;
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// Copy the spaces and/or zeros.
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if (fw + precision)
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if (precision)
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{
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int i;
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// copy leading spaces (or when doing %8.4d stuff)
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while (fw > 0)
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{
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i = fw;
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fw -= i;
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while (i)
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{
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if (((cast(size_t) bf) & 3) == 0)
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{
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break;
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}
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*bf++ = ' ';
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--i;
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}
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while (i >= 4)
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{
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*cast(uint*) bf = 0x20202020;
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bf += 4;
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i -= 4;
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}
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while (i)
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{
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*bf++ = ' ';
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--i;
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}
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}
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// copy leader
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sn = lead.ptr + 1;
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while (lead[0])
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@ -1258,32 +1055,17 @@ pure nothrow @nogc
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--i;
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}
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}
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break;
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default: // Unknown, just copy code.
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s = num.ptr + NUMSZ - 1;
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*s = f[0];
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l = 1;
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fw = precision = fl = 0;
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lead[0] = 0;
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tail[0] = 0;
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precision = 0;
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decimalPos = 0;
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goto scopy;
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}
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f.popFront();
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}
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*bf = 0;
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return buf[0 .. tlen + cast(int) (bf - buf.ptr)];
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}
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char[] format(string fmt)(return char[] buf, ...)
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char[] format(string fmt, Args...)(return char[] buf, ...)
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nothrow
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{
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va_list va;
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va_start(va, buf);
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auto result = vsprintf!fmt(buf, va);
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auto result = vsprintf!(fmt, Args)(buf, va);
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va_end(va);
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return result;
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}
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@ -1292,75 +1074,59 @@ nothrow unittest
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{
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char[318] buffer;
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// Format without arguments.
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assert(format!""(buffer) == "");
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assert(format!"asdfqweryxcvz"(buffer) == "asdfqweryxcvz");
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// Modifiers.
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assert(format!"%g"(buffer, 8.5) == "8.5");
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assert(format!"%5g"(buffer, 8.6) == " 8.6");
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assert(format!"%i"(buffer, 1000) == "1000");
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assert(format!"%*i"(buffer, 5, 1) == " 1");
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assert(format!"%.1f"(buffer, 10.25) == "10.3");
|
||||
assert(format!"%.*f"(buffer, 1, 10.25) == "10.3");
|
||||
assert(format!"%i"(buffer, 1) == "1");
|
||||
assert(format!"%7.3g"(buffer, 0.01) == " 0.01");
|
||||
assert(format!("g", double)(buffer, 8.5) == "8.5");
|
||||
assert(format!("g", double)(buffer, 8.6) == "8.6");
|
||||
assert(format!("i", int)(buffer, 1000) == "1000");
|
||||
assert(format!("i", int)(buffer, 1) == "1");
|
||||
assert(format!("g", double)(buffer, 10.25) == "10.25");
|
||||
assert(format!("i", int)(buffer, 1) == "1");
|
||||
assert(format!("g", double)(buffer, 0.01) == "0.01");
|
||||
|
||||
// Integer size.
|
||||
assert(format!"%hi"(buffer, 10) == "10");
|
||||
assert(format!"%li"(buffer, 10) == "10");
|
||||
assert(format!"%li"(buffer, 10L) == "10");
|
||||
assert(format!("i", short)(buffer, 10) == "10");
|
||||
assert(format!("l", long)(buffer, 10L) == "10");
|
||||
|
||||
// String printing.
|
||||
assert(format!"%s"(buffer, "Some weired string") == "Some weired string");
|
||||
assert(format!"%s"(buffer, cast(string) null) == "null");
|
||||
assert(format!"%.4s"(buffer, "Some weired string") == "Some");
|
||||
assert(format!"%c"(buffer, 'c') == "c");
|
||||
assert(format!("s", string)(buffer, "Some weired string") == "Some weired string");
|
||||
assert(format!("s", string)(buffer, cast(string) null) == "null");
|
||||
assert(format!("c", char)(buffer, 'c') == "c");
|
||||
|
||||
// Integer conversions.
|
||||
assert(format!"%i"(buffer, 8) == "8");
|
||||
assert(format!"%i"(buffer, 8) == "8");
|
||||
assert(format!"%i"(buffer, -8) == "-8");
|
||||
assert(format!"%li"(buffer, -8L) == "-8");
|
||||
assert(format!"%u"(buffer, 8) == "8");
|
||||
assert(format!"%i"(buffer, 100000001) == "100000001");
|
||||
assert(format!"%.12i"(buffer, 99999999L) == "000099999999");
|
||||
assert(format!"%i"(buffer, 100000001) == "100000001");
|
||||
assert(format!("i", int)(buffer, 8) == "8");
|
||||
assert(format!("i", int)(buffer, 8) == "8");
|
||||
assert(format!("i", int)(buffer, -8) == "-8");
|
||||
assert(format!("l", long)(buffer, -8L) == "-8");
|
||||
assert(format!("u", uint)(buffer, 8) == "8");
|
||||
assert(format!("i", int)(buffer, 100000001) == "100000001");
|
||||
assert(format!("i", int)(buffer, 99999999L) == "99999999");
|
||||
|
||||
// Floating point conversions.
|
||||
assert(format!"%g"(buffer, 0.1234) == "0.1234");
|
||||
assert(format!"%g"(buffer, 0.3) == "0.3");
|
||||
assert(format!"%g"(buffer, 0.333333333333) == "0.333333");
|
||||
assert(format!"%g"(buffer, 38234.1234) == "38234.1");
|
||||
assert(format!"%g"(buffer, -0.3) == "-0.3");
|
||||
assert(format!"%g"(buffer, 0.000000000000000006) == "6e-18");
|
||||
assert(format!"%g"(buffer, 0.0) == "0");
|
||||
assert(format!"%f"(buffer, 0.0) == "0.000000");
|
||||
assert(format!"%f"(buffer, double.init) == "NaN");
|
||||
assert(format!"%f"(buffer, double.infinity) == "Inf");
|
||||
assert(format!"%.0g"(buffer, 0.0) == "0");
|
||||
assert(format!"%f"(buffer, 0.000000000000000000000000003) == "0.000000");
|
||||
assert(format!"%g"(buffer, 0.23432e304) == "2.3432e+303");
|
||||
assert(format!"%f"(buffer, -0.23432e8) == "-23432000.000000");
|
||||
assert(format!"%e"(buffer, double.init) == "NaN");
|
||||
assert(format!"%f"(buffer, 1e-307) == "0.000000");
|
||||
assert(format!"%f"(buffer, 1e+8) == "100000000.000000");
|
||||
assert(format!"%05g"(buffer, 111234.1) == "111234");
|
||||
assert(format!"%.2g"(buffer, double.init) == "Na");
|
||||
assert(format!"%.1e"(buffer, 0.999) == "1.0e+00");
|
||||
assert(format!"%.0f"(buffer, 0.999) == "1");
|
||||
assert(format!"%.9f"(buffer, 1e-307) == "0.000000000");
|
||||
assert(format!"%g"(buffer, 0x1p-16382L)); // "6.95336e-310"
|
||||
assert(format!"%f"(buffer, 1e+3) == "1000.000000");
|
||||
assert(format!"%g"(buffer, 38234.1234) == "38234.1");
|
||||
assert(format!("g", double)(buffer, 0.1234) == "0.1234");
|
||||
assert(format!("g", double)(buffer, 0.3) == "0.3");
|
||||
assert(format!("g", double)(buffer, 0.333333333333) == "0.333333");
|
||||
assert(format!("g", double)(buffer, 38234.1234) == "38234.1");
|
||||
assert(format!("g", double)(buffer, -0.3) == "-0.3");
|
||||
assert(format!("g", double)(buffer, 0.000000000000000006) == "6e-18");
|
||||
assert(format!("g", double)(buffer, 0.0) == "0");
|
||||
assert(format!("g", double)(buffer, double.init) == "NaN");
|
||||
assert(format!("g", double)(buffer, -double.init) == "-NaN");
|
||||
assert(format!("g", double)(buffer, double.infinity) == "Inf");
|
||||
assert(format!("g", double)(buffer, -double.infinity) == "-Inf");
|
||||
assert(format!("g", double)(buffer, 0.000000000000000000000000003) == "3e-27");
|
||||
assert(format!("g", double)(buffer, 0.23432e304) == "2.3432e+303");
|
||||
assert(format!("g", double)(buffer, -0.23432e8) == "-2.3432e+07");
|
||||
assert(format!("g", double)(buffer, 1e-307) == "1e-307");
|
||||
assert(format!("g", double)(buffer, 1e+8) == "1e+08");
|
||||
assert(format!("g", double)(buffer, 111234.1) == "111234");
|
||||
assert(format!("g", double)(buffer, 0.999) == "0.999");
|
||||
assert(format!("g", double)(buffer, 0x1p-16382L)); // "6.95336e-310"
|
||||
assert(format!("g", double)(buffer, 1e+3) == "1000");
|
||||
assert(format!("g", double)(buffer, 38234.1234) == "38234.1");
|
||||
|
||||
// Pointer conversions.
|
||||
assert(format!"%p"(buffer, cast(void*) 1) == "0x1");
|
||||
assert(format!"%p"(buffer, cast(void*) 20) == "0x14");
|
||||
|
||||
// Unknown specifier.
|
||||
assert(format!"%k"(buffer) == "k");
|
||||
assert(format!"%%k"(buffer) == "%k");
|
||||
// Pointer convesions.
|
||||
assert(format!("p", void*)(buffer, cast(void*) 1) == "0x1");
|
||||
assert(format!("p", void*)(buffer, cast(void*) 20) == "0x14");
|
||||
}
|
||||
|
||||
private struct FormatSpec
|
||||
|
||||
Loading…
Reference in New Issue
Block a user