Difference between revisions of "Ord"
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Pedro Oval (talk | contribs) (Now that the bug that stopped us from trimming the input at the very beginning is fixed, we can do that.) |
m (<lsl> tag to <source>) |
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|return_type=integer | |return_type=integer | ||
|return_text=with the Unicode code of the first character in '''chr'''. | |return_text=with the Unicode code of the first character in '''chr'''. | ||
|spec=< | |spec=<source lang="lsl2">// Ord() function, written by Pedro Oval, 2010-05-28 | ||
// This function works by using llEscapeURL to find the corresponding UTF-8 | // This function works by using llEscapeURL to find the corresponding UTF-8 | ||
// string then converts it to the Unicode code. In cases where llEscapeURL | // string then converts it to the Unicode code. In cases where llEscapeURL | ||
| Line 41: | Line 41: | ||
return cp; | return cp; | ||
} | } | ||
</ | </source> | ||
|caveats= | |caveats= | ||
* An empty string will return 0. | * An empty string will return 0. | ||
| Line 47: | Line 47: | ||
* At the time of writing this article, the performance of this function is very low, because the performance of the underlying functions used is also very low. Use it only if there's no alternative. | * At the time of writing this article, the performance of this function is very low, because the performance of the underlying functions used is also very low. Use it only if there's no alternative. | ||
* Passing more than 1 character is possible, and in that case only the first character's code will be returned. | * Passing more than 1 character is possible, and in that case only the first character's code will be returned. | ||
|examples=< | |examples=<source lang="lsl2"> | ||
integer heart = Ord("♥"); // sets 'heart' to 9829 (0x2665, the Unicode code of the heart) | integer heart = Ord("♥"); // sets 'heart' to 9829 (0x2665, the Unicode code of the heart) | ||
integer space = Ord(" "); // sets 'space' to 32 (which is the ASCII/Unicode code of the space) | integer space = Ord(" "); // sets 'space' to 32 (which is the ASCII/Unicode code of the space) | ||
</ | </source> | ||
|also_functions=* [[Chr]] | |also_functions=* [[Chr]] | ||
* [[Combined Library#Unicode functions]] | |||
|cat1=User-Defined Functions | |cat1=User-Defined Functions | ||
|cat2=Examples | |cat2=Examples | ||
}} | }} | ||
Latest revision as of 14:31, 22 January 2015
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Summary
Function: integer Ord( string chr );Returns an integer with the Unicode code of the first character in chr.
| • string | chr | – | String containing the Unicode character whose code is to be found |
Specification
// Ord() function, written by Pedro Oval, 2010-05-28
// This function works by using llEscapeURL to find the corresponding UTF-8
// string then converts it to the Unicode code. In cases where llEscapeURL
// doesn't help, a combination of llStringToBase64 and llBase64ToInteger
// does the job instead.
integer Ord(string chr)
{
if (chr == "")
return 0;
chr = llGetSubString(chr, 0, 0);
string hex = llEscapeURL(chr);
if (llGetSubString(hex, 0, 0) != "%")
{
// Regular character - we can't take advantage of llEscapeURL in this case,
// so we use llStringToBase64/llBase64ToInteger instead.
return llBase64ToInteger("AAAA" + llStringToBase64(chr));
}
integer b = (integer)("0x" + llGetSubString(hex, 1, 2));
if (b < 194 || b > 244)
return b;
if (b < 224)
return ((b & 0x1F) << 6) | (integer)("0x" + llGetSubString(hex, 4, 5)) & 0x3F;
integer cp;
if (b < 240)
{
cp = (b & 0x0F) << 12;
cp += ((integer)("0x" + llGetSubString(hex, 4, 5)) & 0x3F) << 6;
cp += (integer)("0x" + llGetSubString(hex, 7, 8)) & 0x3F;
return cp;
}
cp = (b & 0x07) << 18;
cp += ((integer)("0x" + llGetSubString(hex, 4, 5)) & 0x3F) << 12;
cp += ((integer)("0x" + llGetSubString(hex, 7, 8)) & 0x3F) << 6;
cp += (integer)("0x" + llGetSubString(hex, 10, 11)) & 0x3F;
return cp;
}
Caveats
- An empty string will return 0.
- For some "ill" cases, behaviour can vary between using Mono or not.
- At the time of writing this article, the performance of this function is very low, because the performance of the underlying functions used is also very low. Use it only if there's no alternative.
- Passing more than 1 character is possible, and in that case only the first character's code will be returned.
Examples
integer heart = Ord("♥"); // sets 'heart' to 9829 (0x2665, the Unicode code of the heart)
integer space = Ord(" "); // sets 'space' to 32 (which is the ASCII/Unicode code of the space)