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Code Issues Packages 1 Wiki Activity

feat(std/node) Endianness (#3833)

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Chris Knight 2020-01-30 23:57:29 +00:00 committed by GitHub
parent de5c099b47
commit 3de9540ac6
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2 changed files with 19 additions and 10 deletions
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15
std/node/os.ts
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@ -19,6 +19,7 @@
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
import { notImplemented } from "./_utils.ts";
import { EOL as fsEOL } from "../fs/eol.ts";
const SEE_GITHUB_ISSUE = "See https://github.com/denoland/deno/issues/3802";
@ -96,9 +97,17 @@ export function cpus(): CPUCoreInfo[] {
notImplemented(SEE_GITHUB_ISSUE);
}
/** Not yet implemented */
/**
* Returns a string identifying the endianness of the CPU for which the Deno
* binary was compiled. Possible values are 'BE' for big endian and 'LE' for
* little endian.
**/
export function endianness(): "BE" | "LE" {
notImplemented(SEE_GITHUB_ISSUE);
// Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView#Endianness
const buffer = new ArrayBuffer(2);
new DataView(buffer).setInt16(0, 256, true /* littleEndian */);
// Int16Array uses the platform's endianness.
return new Int16Array(buffer)[0] === 256 ? "LE" : "BE";
}
/** Not yet implemented */
@ -201,7 +210,7 @@ export const constants = {
}
};
export const EOL = Deno.build.os == "win" ? "\r\n" : "\n";
export const EOL = Deno.build.os == "win" ? fsEOL.CRLF : fsEOL.LF;
const validateInt32 = (
value: number,

14
std/node/os_test.ts
View file

@ -154,6 +154,13 @@ test({
}
});
test({
name: "Endianness is determined",
fn() {
assert(["LE", "BE"].includes(os.endianness()));
}
});
// Method is currently implemented correctly for windows but not for any other os
test({
name: "Load average is an array of 3 numbers",
@ -187,13 +194,6 @@ test({
Error,
"Not implemented"
);
assertThrows(
() => {
os.endianness();
},
Error,
"Not implemented"
);
assertThrows(
() => {
os.freemem();