shell_def.h

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#pragma once
 
#include <string>
 
namespace bs {
    constexpr bool is_arg(const std::string_view &sArg) {
        if (sArg.length() > 19)return false;
        for (const char cChar: sArg) {
            if (cChar < '0' || cChar > '9') return false;
        }
        return true;
    }
 
    inline bool is_arg(const std::string &sArg) {
        if (sArg.empty() || sArg.length() > 19)return false;
        for (const char cChar: sArg) {
            if (cChar < '0' || cChar > '9') return false;
        }
        return true;
    }
 
    constexpr bool is_var(const std::string_view &sVar) {
        if (sVar.empty())return false;
        char cChar = sVar[0];
        if (
            cChar != '_'
            && (cChar < 'a' || cChar > 'z')
            && (cChar < 'A' || cChar > 'Z')
        ) { return false; }
        for (std::size_t i = 1; i < sVar.length(); ++i) {
            cChar = sVar[i];
            if (
                cChar != '_'
                && (cChar < 'a' || cChar > 'z')
                && (cChar < 'A' || cChar > 'Z')
                && (cChar < '0' || cChar > '9')
            ) { return false; }
        }
        return true;
    }
 
    inline bool is_var(const std::string &sVar) {
        if (sVar.empty())return false;
        char cChar = sVar[0];
        if (
            cChar != '_'
            && (cChar < 'a' || cChar > 'z')
            && (cChar < 'A' || cChar > 'Z')
        ) { return false; }
        for (std::size_t i = 1; i < sVar.length(); ++i) {
            cChar = sVar[i];
            if (
                cChar != '_'
                && (cChar < 'a' || cChar > 'z')
                && (cChar < 'A' || cChar > 'Z')
                && (cChar < '0' || cChar > '9')
            ) { return false; }
        }
        return true;
    }
 
    constexpr bool is_number(const std::string_view &sArg) {
        if (sArg.empty())return false;
        std::size_t i = 0;
        if (sArg[0] == '+' || sArg[0] == '-') {
            if (sArg.length() > 19)return false;
            ++i;
        } else {
            if (sArg.length() > 18)return false;
        }
        while (i < sArg.length()) {
            if (sArg[i] < '0' || sArg[i] > '9') return false;
            ++i;
        }
        return true;
    }
}