CppLearningIntent.hpp

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/*
 *  (c) Copyright erarnitox.de - All rights reserved
 *  Author: Erarnitox <david@erarnitox.de>
 *
 *  License: MIT License
 *
 *  Description: Compile-time phrase table and ASCII lowercase scan for the
 *  "how to learn C++" message hint. Kept header-only so unit tests and the
 *  hot-path bench can measure it without Discord/DPP.
 */
 
#pragma once
 
#include <algorithm>
#include <array>
#include <cctype>
#include <string>
#include <string_view>
 
namespace cpp_learning_intent {
 
inline constexpr std::array<std::string_view, 28> k_phrases{
    "how to learn c++",
    "how do i learn c++",
    "how can i learn c++",
    "where to learn c++",
    "where can i learn c++",
    "want to learn c++",
    "wanna learn c++",
    "learn c++",
    "learning c++",
    "c++ tutorial",
    "tutorial for c++",
    "tutorials for c++",
    "cpp tutorial",
    "tutorial cpp",
    "learn cpp",
    "learning cpp",
    "how to learn cpp",
    "how do i learn cpp",
    "start learning c++",
    "getting started with c++",
    "beginner c++",
    "new to c++",
    "teach me c++",
    "best way to learn c++",
    "good resource c++",
    "resources to learn c++",
    "any tutorial c++",
    "recommend c++ course",
};
 
[[nodiscard]] inline std::string lowercase_ascii(std::string_view text) {
    std::string out(text.begin(), text.end());
    std::transform(
        out.begin(), out.end(), out.begin(), [](unsigned char c) { return static_cast<char>(std::tolower(c)); });
    return out;
}
 
[[nodiscard]] inline bool mentions_cpp_learning_intent(std::string_view original_text) {
    const std::string lower = lowercase_ascii(original_text);
    for (const std::string_view phrase : k_phrases) {
        if (lower.find(phrase) != std::string::npos) {
            return true;
        }
    }
    return false;
}
 
}  // namespace cpp_learning_intent