add copy/paste support to the frequency selector

core/src/utils/hrfreq.cpp

@@ -0,0 +1,113 @@
+#include "hrfreq.h"
+#include <utils/flog.h>
+
+namespace hrfreq {
+
+
+    std::string toString(double freq) {
+        // Determine the scale
+        int maxDecimals = 0;
+        const char* suffix = "Hz";
+        if (freq >= 1e9) {
+            freq /= 1e9;
+            maxDecimals = 9;
+            suffix = "GHz";
+        }
+        else if (freq >= 1e6) {
+            freq /= 1e6;
+            maxDecimals = 6;
+            suffix = "MHz";
+        }
+        else if (freq >= 1e3) {
+            freq /= 1e3;
+            maxDecimals = 3;
+            suffix = "KHz";
+        }
+
+        // Convert to string (TODO: Not sure if limiting the decimals rounds)
+        char numBuf[128];
+        int numLen = sprintf(numBuf, "%0.*lf", maxDecimals, freq);
+
+        // Remove the useless zeros
+        for (int i = numLen-1; i >= 0; i--) {
+            if (numBuf[i] != '0' && numBuf[i] != '.') { break; }
+            numBuf[i] = 0;
+        }
+
+        // Concat the suffix
+        char finalBuf[128];
+        sprintf(finalBuf, "%s%s", numBuf, suffix);
+
+        // Return the final string
+        return finalBuf;
+    }
+
+    bool isNumeric(char c) {
+        return std::isdigit(c) || c == '+' || c == '-' || c == '.' || c == ',';
+    }
+
+    bool fromString(const std::string& str, double& freq) {
+        // Skip non-numeric characters
+        int i = 0;
+        char c;
+        for (; i < str.size(); i++) {
+            if (isNumeric(str[i])) { break; }
+        }
+
+        // Extract the numeric part
+        std::string numeric;
+        for (; i < str.size(); i++) {
+            // Get the character
+            c = str[i];
+
+            // If it's a letter, stop
+            if (std::isalpha(c)) { break; }
+
+            // If isn't numeric, skip it
+            if (!isNumeric(c)) { continue; }
+
+            // Add the character to the numeric string
+            numeric += c;
+        }
+
+        // Attempt to parse the numeric part
+        double num;
+        try {
+            num = std::stod(numeric);
+        }
+        catch (const std::exception& e) {
+            flog::error("Failed to parse numeric part: '{}'", numeric);
+            return false;
+        }
+
+        // If no more text is available, assume the numeric part gives a frequency in Hz
+        if (i == str.size()) {
+            flog::warn("No unit given, assuming it's Hz");
+            freq = num;
+            return true;
+        }
+
+        // Scale the numeric value depending on the first scale character
+        char scale = std::toupper(str[i]);
+        switch (scale) {
+        case 'G':
+            num *= 1e9;
+            break;
+        case 'M':
+            num *= 1e6;
+            break;
+        case 'K':
+            num *= 1e3;
+            break;
+        case 'H':
+            break;
+        default:
+            flog::warn("Unknown frequency scale: '{}'", scale);
+            break;
+        }
+
+        // Return the frequency
+        freq = num;
+        return true; // TODO
+    }
+}

core/src/utils/hrfreq.h

@@ -0,0 +1,19 @@
+#pragma once
+#include <string>
+
+namespace hrfreq {
+    /**
+     * Convert a frequency to a human-readable string.
+     * @param freq Frequency in Hz.
+     * @return Human-readable representation of the frequency.
+    */
+    std::string toString(double freq);
+
+    /**
+     * Convert a human-readable representation of a frequency to a frequency value.
+     * @param str String containing the human-readable frequency.
+     * @param freq Value to write the decoded frequency to.
+     * @return True on success, false otherwise.
+    */
+    bool fromString(const std::string& str, double& freq);
+}