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Add ASCII output for frequency table 

When showing results in the frequency distribution table, it's quite
helpful to see the distribution of the ASCII letters, if any. Provide an
option to show this to show the characters alongside the code.

Fixes #1169.

Signed-off-by: Alex Blewitt <alex.blewitt@gmail.com>
This commit is contained in:
Alex Blewitt 2021-02-07 15:51:20 +00:00
parent ba66fd6546
commit 69073c9d99
1 changed files with 17 additions and 1 deletions
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18
src/core/operations/FrequencyDistribution.mjs
View File

@ -31,6 +31,11 @@ class FrequencyDistribution extends Operation {
"name": "Show 0%s",
"type": "boolean",
"value": true
},
{
"name": "Show ASCII",
"type": "boolean",
"value": true
}
];
}
@ -77,6 +82,7 @@ class FrequencyDistribution extends Operation {
*/
present(freq, args) {
const showZeroes = args[0];
const showAscii = args[1];
// Print
let output = `<canvas id='chart-area'></canvas><br>
Total data length: ${freq.dataLength}
@ -97,7 +103,17 @@ Byte Percentage
for (let i = 0; i < 256; i++) {
if (freq.distribution[i] || showZeroes) {
output += " " + Utils.hex(i, 2) + " (" +
let c = " ";
if (showAscii) {
if (i <= 32) {
c = String.fromCharCode(0x2400 + i);
} else if (i === 127) {
c = String.fromCharCode(0x2421);
} else {
c = String.fromCharCode(i);
}
}
output += " " + Utils.hex(i, 2) + " " + c + " (" +
(freq.percentages[i].toFixed(2).replace(".00", "") + "%)").padEnd(8, " ") +
Array(Math.ceil(freq.percentages[i])+1).join("|") + "\n";
}