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Turned some escapes associative arrays into switch functions to avoid GC.

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This commit is contained in:
Ferdinand Majerech 2014-07-24 23:18:49 +02:00
parent 19f163a150
commit bed862c8ab
1 changed files with 55 additions and 25 deletions
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80
source/dyaml/escapes.d
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@ -11,35 +11,67 @@ module dyaml.escapes;
package:
///Translation table from YAML escapes to dchars.
immutable dchar[dchar] fromEscapes;
// immutable dchar[dchar] fromEscapes;
///Translation table from dchars to YAML escapes.
immutable dchar[dchar] toEscapes;
///Translation table from prefixes of escaped hexadecimal format characters to their lengths.
immutable uint[dchar] escapeHexCodes;
// ///Translation table from prefixes of escaped hexadecimal format characters to their lengths.
// immutable uint[dchar] escapeHexCodes;
/// All YAML escapes.
immutable dchar[] escapes = ['0', 'a', 'b', 't', '\t', 'n', 'v', 'f', 'r', 'e', ' ',
'\"', '\\', 'N', '_', 'L', 'P'];
/// YAML hex codes specifying the length of the hex number.
immutable dchar[] escapeHexCodeList = ['x', 'u', 'U'];
/// Covert a YAML escape to a dchar.
///
/// Need a function as associative arrays don't work with @nogc.
/// (And this may be even faster with a function.)
dchar fromEscape(dchar escape) @safe pure nothrow @nogc
{
switch(escape)
{
case '0': return '\0';
case 'a': return '\x07';
case 'b': return '\x08';
case 't': return '\x09';
case '\t': return '\x09';
case 'n': return '\x0A';
case 'v': return '\x0B';
case 'f': return '\x0C';
case 'r': return '\x0D';
case 'e': return '\x1B';
case ' ': return '\x20';
case '\"': return '\"';
case '\\': return '\\';
case 'N': return '\u0085';
case '_': return '\xA0';
case 'L': return '\u2028';
case 'P': return '\u2029';
default: assert(false, "No such YAML escape");
}
}
/// Get the length of a hexadecimal number determined by its hex code.
///
/// Need a function as associative arrays don't work with @nogc.
/// (And this may be even faster with a function.)
uint escapeHexLength(dchar hexCode) @safe pure nothrow @nogc
{
switch(hexCode)
{
case 'x': return 2;
case 'u': return 4;
case 'U': return 8;
default: assert(false, "No such YAML hex code");
}
}
static this()
{
fromEscapes =
['0': '\0',
'a': '\x07',
'b': '\x08',
't': '\x09',
'\t': '\x09',
'n': '\x0A',
'v': '\x0B',
'f': '\x0C',
'r': '\x0D',
'e': '\x1B',
' ': '\x20',
'\"': '\"',
'\\': '\\',
'N': '\u0085',
'_': '\xA0',
'L': '\u2028',
'P': '\u2029'];
toEscapes =
toEscapes =
['\0': '0',
'\x07': 'a',
'\x08': 'b',
@ -55,7 +87,5 @@ static this()
'\xA0': '_',
'\u2028': 'L',
'\u2029': 'P'];
escapeHexCodes = ['x': 2, 'u': 4, 'U': 8];
}