StyleSpec.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2019 rubenwardy
 
#pragma once
 
#include "client/texturesource.h"
#include "client/fontengine.h"
#include "debug.h"
#include "irrlichttypes_bloated.h"
#include "util/string.h"
#include <algorithm>
#include <array>
#include <vector>
 
 
class StyleSpec
{
public:
        enum Property
        {
                TEXTCOLOR,
                BGCOLOR,
                BGCOLOR_HOVERED, // Note: Deprecated property
                BGCOLOR_PRESSED, // Note: Deprecated property
                NOCLIP,
                BORDER,
                BGIMG,
                BGIMG_HOVERED, // Note: Deprecated property
                BGIMG_MIDDLE,
                BGIMG_PRESSED, // Note: Deprecated property
                FGIMG,
                FGIMG_HOVERED, // Note: Deprecated property
                FGIMG_MIDDLE,
                FGIMG_PRESSED, // Note: Deprecated property
                ALPHA,
                CONTENT_OFFSET,
                PADDING,
                FONT,
                FONT_SIZE,
                HALIGN,
                VALIGN,
                COLORS,
                BORDERCOLORS,
                BORDERWIDTHS,
                SOUND,
                SPACING,
                SIZE,
                NUM_PROPERTIES,
                NONE
        };
 
        // State is a bitfield, it's possible to have multiple of these at once
        enum State : u8
        {
                STATE_DEFAULT = 0,
                STATE_FOCUSED = 1 << 0,
                STATE_HOVERED = 1 << 1,
                STATE_PRESSED = 1 << 2,
                NUM_STATES = 1 << 3, // This includes all permutations
                STATE_INVALID = 1 << 4,
        };
 
private:
        std::array<bool, NUM_PROPERTIES> property_set{};
        std::array<std::string, NUM_PROPERTIES> properties;
        State state_map = STATE_DEFAULT;
 
public:
        static Property GetPropertyByName(const std::string &name)
        {
                if (name == "textcolor") {
                        return TEXTCOLOR;
                } else if (name == "bgcolor") {
                        return BGCOLOR;
                } else if (name == "bgcolor_hovered") {
                        return BGCOLOR_HOVERED;
                } else if (name == "bgcolor_pressed") {
                        return BGCOLOR_PRESSED;
                } else if (name == "noclip") {
                        return NOCLIP;
                } else if (name == "border") {
                        return BORDER;
                } else if (name == "bgimg") {
                        return BGIMG;
                } else if (name == "bgimg_hovered") {
                        return BGIMG_HOVERED;
                } else if (name == "bgimg_middle") {
                        return BGIMG_MIDDLE;
                } else if (name == "bgimg_pressed") {
                        return BGIMG_PRESSED;
                } else if (name == "fgimg") {
                        return FGIMG;
                } else if (name == "fgimg_hovered") {
                        return FGIMG_HOVERED;
                } else if (name == "fgimg_middle") {
                        return FGIMG_MIDDLE;
                } else if (name == "fgimg_pressed") {
                        return FGIMG_PRESSED;
                } else if (name == "alpha") {
                        return ALPHA;
                } else if (name == "content_offset") {
                        return CONTENT_OFFSET;
                } else if (name == "padding") {
                        return PADDING;
                } else if (name == "font") {
                        return FONT;
                } else if (name == "font_size") {
                        return FONT_SIZE;
                } else if (name == "halign") {
                        return HALIGN;
                } else if (name == "valign") {
                        return VALIGN;
                } else if (name == "colors") {
                        return COLORS;
                } else if (name == "bordercolors") {
                        return BORDERCOLORS;
                } else if (name == "borderwidths") {
                        return BORDERWIDTHS;
                } else if (name == "sound") {
                        return SOUND;
                } else if (name == "spacing") {
                        return SPACING;
                } else if (name == "size") {
                        return SIZE;
                } else {
                        return NONE;
                }
        }
 
        std::string get(Property prop, std::string def) const
        {
                const auto &val = properties[prop];
                return val.empty() ? def : val;
        }
 
        void set(Property prop, const std::string &value)
        {
                properties[prop] = value;
                property_set[prop] = true;
        }

        static State getStateByName(const std::string &name)
        {
                if (name == "default") {
                        return STATE_DEFAULT;
                } else if (name == "focused") {
                        return STATE_FOCUSED;
                } else if (name == "hovered") {
                        return STATE_HOVERED;
                } else if (name == "pressed") {
                        return STATE_PRESSED;
                } else {
                        return STATE_INVALID;
                }
        }

        State getState() const
        {
                return state_map;
        }

        void addState(State state)
        {
                FATAL_ERROR_IF(state >= NUM_STATES, "Out-of-bounds state received");
 
                state_map = static_cast<State>(state_map | state);
        }

        //  combined style for a state by propagating values in its component states
        static StyleSpec getStyleFromStatePropagation(const std::array<StyleSpec, NUM_STATES> &styles, State state)
        {
                StyleSpec temp = styles[StyleSpec::STATE_DEFAULT];
                temp.state_map = state;
                for (int i = StyleSpec::STATE_DEFAULT + 1; i <= state; i++) {
                        if ((state & i) != 0) {
                                temp = temp | styles[i];
                        }
                }
 
                return temp;
        }
 
        video::SColor getColor(Property prop, video::SColor def) const
        {
                const auto &val = properties[prop];
                if (val.empty()) {
                        return def;
                }
 
                parseColorString(val, def, false, 0xFF);
                return def;
        }
 
        video::SColor getColor(Property prop) const
        {
                const auto &val = properties[prop];
                FATAL_ERROR_IF(val.empty(), "Unexpected missing property");
 
                video::SColor color;
                parseColorString(val, color, false, 0xFF);
                return color;
        }
 
        std::array<video::SColor, 4> getColorArray(Property prop,
                std::array<video::SColor, 4> def) const
        {
                const auto &val = properties[prop];
                if (val.empty())
                        return def;
 
                std::vector<std::string> strs;
                if (!parseArray(val, strs))
                        return def;
 
                for (size_t i = 0; i <= 3; i++) {
                        video::SColor color;
                        if (parseColorString(strs[i], color, false, 0xff))
                                def[i] = color;
                }
 
                return def;
        }
 
        std::array<s32, 4> getIntArray(Property prop, std::array<s32, 4> def) const
        {
                const auto &val = properties[prop];
                if (val.empty())
                        return def;
 
                std::vector<std::string> strs;
                if (!parseArray(val, strs))
                        return def;
 
                for (size_t i = 0; i <= 3; i++)
                        def[i] = stoi(strs[i]);
 
                return def;
        }
 
        core::rect<s32> getRect(Property prop, core::rect<s32> def) const
        {
                const auto &val = properties[prop];
                if (val.empty())
                        return def;
 
                core::rect<s32> rect;
                if (!parseRect(val, &rect))
                        return def;
 
                return rect;
        }
 
        core::rect<s32> getRect(Property prop) const
        {
                const auto &val = properties[prop];
                FATAL_ERROR_IF(val.empty(), "Unexpected missing property");
 
                core::rect<s32> rect;
                parseRect(val, &rect);
                return rect;
        }
 
        v2f32 getVector2f(Property prop, v2f32 def) const
        {
                const auto &val = properties[prop];
                if (val.empty())
                        return def;
 
                v2f32 vec;
                if (!parseVector2f(val, &vec))
                        return def;
 
                return vec;
        }
 
        v2s32 getVector2i(Property prop, v2s32 def) const
        {
                const auto &val = properties[prop];
                if (val.empty())
                        return def;
 
                v2f32 vec;
                if (!parseVector2f(val, &vec))
                        return def;
 
                return v2s32(vec.X, vec.Y);
        }
 
        v2s32 getVector2i(Property prop) const
        {
                const auto &val = properties[prop];
                FATAL_ERROR_IF(val.empty(), "Unexpected missing property");
 
                v2f32 vec;
                parseVector2f(val, &vec);
                return v2s32(vec.X, vec.Y);
        }
 
        gui::IGUIFont *getFont() const
        {
                FontSpec spec(FONT_SIZE_UNSPECIFIED, FM_Standard, false, false);
 
                const std::string &font = properties[FONT];
                const std::string &size = properties[FONT_SIZE];
 
                if (font.empty() && size.empty())
                        return nullptr;
 
                std::vector<std::string> modes = split(font, ',');
 
                for (size_t i = 0; i < modes.size(); i++) {
                        if (modes[i] == "normal")
                                spec.mode = FM_Standard;
                        else if (modes[i] == "mono")
                                spec.mode = FM_Mono;
                        else if (modes[i] == "bold")
                                spec.bold = true;
                        else if (modes[i] == "italic")
                                spec.italic = true;
                        else if (modes[i] == "_no_server_media") // for internal use only
                                spec.allow_server_media = false;
                }
 
                if (!size.empty()) {
                        int calc_size = 1;
 
                        if (size[0] == '*') {
                                std::string new_size = size.substr(1); // Remove '*' (invalid for stof)
                                calc_size = stof(new_size) * g_fontengine->getFontSize(spec.mode);
                        } else if (size[0] == '+' || size[0] == '-') {
                                calc_size = stoi(size) + g_fontengine->getFontSize(spec.mode);
                        } else {
                                calc_size = stoi(size);
                        }
 
                        spec.size = (unsigned)std::min(std::max(calc_size, 1), 999);
                }
 
                return g_fontengine->getFont(spec);
        }
 
        video::ITexture *getTexture(Property prop, ISimpleTextureSource *tsrc,
                        video::ITexture *def) const
        {
                const auto &val = properties[prop];
                if (val.empty()) {
                        return def;
                }
 
                video::ITexture *texture = tsrc->getTexture(val);
 
                return texture;
        }
 
        video::ITexture *getTexture(Property prop, ISimpleTextureSource *tsrc) const
        {
                const auto &val = properties[prop];
                FATAL_ERROR_IF(val.empty(), "Unexpected missing property");
 
                video::ITexture *texture = tsrc->getTexture(val);
 
                return texture;
        }
 
        bool getBool(Property prop, bool def) const
        {
                const auto &val = properties[prop];
                if (val.empty()) {
                        return def;
                }
 
                return is_yes(val);
        }
 
        inline bool isNotDefault(Property prop) const
        {
                return !properties[prop].empty();
        }
 
        inline bool hasProperty(Property prop) const { return property_set[prop]; }
 
        StyleSpec &operator|=(const StyleSpec &other)
        {
                for (size_t i = 0; i < NUM_PROPERTIES; i++) {
                        auto prop = (Property)i;
                        if (other.hasProperty(prop)) {
                                set(prop, other.get(prop, ""));
                        }
                }
 
                return *this;
        }
 
        StyleSpec operator|(const StyleSpec &other) const
        {
                StyleSpec newspec = *this;
                newspec |= other;
                return newspec;
        }
 
private:
        bool parseArray(const std::string &value, std::vector<std::string> &arr) const
        {
                std::vector<std::string> strs = split(value, ',');
 
                if (strs.size() == 1) {
                        arr = {strs[0], strs[0], strs[0], strs[0]};
                } else if (strs.size() == 2) {
                        arr = {strs[0], strs[1], strs[0], strs[1]};
                } else if (strs.size() == 4) {
                        arr = strs;
                } else {
                        warningstream << "Invalid array size (" << strs.size()
                                        << " arguments): \"" << value << "\"" << std::endl;
                        return false;
                }
                return true;
        }
 
        bool parseRect(const std::string &value, core::rect<s32> *parsed_rect) const
        {
                core::rect<s32> rect;
                std::vector<std::string> v_rect = split(value, ',');
 
                if (v_rect.size() == 1) {
                        s32 x = stoi(v_rect[0]);
                        rect.UpperLeftCorner = core::vector2di(x, x);
                        rect.LowerRightCorner = core::vector2di(-x, -x);
                } else if (v_rect.size() == 2) {
                        s32 x = stoi(v_rect[0]);
                        s32 y = stoi(v_rect[1]);
                        rect.UpperLeftCorner = core::vector2di(x, y);
                        rect.LowerRightCorner = core::vector2di(-x, -y);
                        // `-x` is interpreted as `w - x`
                } else if (v_rect.size() == 4) {
                        rect.UpperLeftCorner = core::vector2di(
                                        stoi(v_rect[0]), stoi(v_rect[1]));
                        rect.LowerRightCorner = core::vector2di(
                                        stoi(v_rect[2]), stoi(v_rect[3]));
                } else {
                        warningstream << "Invalid rectangle string format: \"" << value
                                        << "\"" << std::endl;
                        return false;
                }
 
                *parsed_rect = rect;
 
                return true;
        }
 
        bool parseVector2f(const std::string &value, v2f32 *parsed_vec) const
        {
                v2f32 vec;
                std::vector<std::string> v_vector = split(value, ',');
 
                if (v_vector.size() == 1) {
                        f32 x = stof(v_vector[0]);
                        vec.X = x;
                        vec.Y = x;
                } else if (v_vector.size() == 2) {
                        vec.X = stof(v_vector[0]);
                        vec.Y = stof(v_vector[1]);
                } else {
                        warningstream << "Invalid 2d vector string format: \"" << value
                                        << "\"" << std::endl;
                        return false;
                }
 
                *parsed_vec = vec;
 
                return true;
        }
};