themed-styler 1.2.4

Client-side runtime styling engine for web and Android/iOS Native with theme support and Tailwind subset
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139

use crate::{State, ThemeEntry, version};
use indexmap::IndexMap;
use serde::Deserialize;

#[derive(Deserialize, Default)]
struct UsageSnapshot {
    #[serde(default)]
    selectors: Vec<String>,
    #[serde(default)]
    classes: Vec<String>,
}

#[derive(Deserialize, Default)]
struct ThemesInput {
    #[serde(default)]
    themes: IndexMap<String, ThemeEntry>,
    #[serde(rename = "currentTheme", default)]
    current_theme: Option<String>,
}

fn build_state(usage: UsageSnapshot, themes_input: ThemesInput) -> State {
    let mut state = State::new_default();
    if !themes_input.themes.is_empty() {
        state.themes = themes_input.themes;
        if let Some(current) = themes_input.current_theme.clone() {
            if state.themes.contains_key(&current) {
                state.current_theme = current;
            }
        }
        if state.default_theme.is_empty() {
            if let Some((name, _)) = state.themes.iter().next() {
                state.default_theme = name.clone();
            }
        }
    }
    state.register_selectors(usage.selectors);
    for class in usage.classes {
        state.used_classes.insert(class);
    }
    state
}

/// Free a string allocated by Rust
#[no_mangle]
pub unsafe extern "C" fn themed_styler_free_string(s: *mut std::os::raw::c_char) {
    if !s.is_null() {
        drop(std::ffi::CString::from_raw(s));
    }
}

/// Render CSS from usage and themes JSON
#[no_mangle]
pub extern "C" fn themed_styler_render_css(
    usage_ptr: *const u8,
    usage_len: usize,
    themes_ptr: *const u8,
    themes_len: usize,
) -> *mut std::os::raw::c_char {
    let usage_json = unsafe {
        let slice = std::slice::from_raw_parts(usage_ptr, usage_len);
        String::from_utf8_lossy(slice).into_owned()
    };

    let themes_json = unsafe {
        let slice = std::slice::from_raw_parts(themes_ptr, themes_len);
        String::from_utf8_lossy(slice).into_owned()
    };

    let usage: UsageSnapshot = serde_json::from_str(&usage_json).unwrap_or_default();
    let themes: ThemesInput = serde_json::from_str(&themes_json).unwrap_or_default();
    let state = build_state(usage, themes);
    let css = state.css_for_web();

    match std::ffi::CString::new(css) {
        Ok(c_str) => c_str.into_raw(),
        Err(_) => std::ptr::null_mut(),
    }
}

/// Get RN styles for selector and classes
#[no_mangle]
pub extern "C" fn themed_styler_get_rn_styles(
    selector_ptr: *const u8,
    selector_len: usize,
    classes_ptr: *const u8,
    classes_len: usize,
    themes_ptr: *const u8,
    themes_len: usize,
) -> *mut std::os::raw::c_char {
    let selector = unsafe {
        let slice = std::slice::from_raw_parts(selector_ptr, selector_len);
        String::from_utf8_lossy(slice).into_owned()
    };

    let classes_json = unsafe {
        let slice = std::slice::from_raw_parts(classes_ptr, classes_len);
        String::from_utf8_lossy(slice).into_owned()
    };

    let themes_json = unsafe {
        let slice = std::slice::from_raw_parts(themes_ptr, themes_len);
        String::from_utf8_lossy(slice).into_owned()
    };

    let classes: Vec<String> = serde_json::from_str(&classes_json).unwrap_or_default();
    let themes: ThemesInput = serde_json::from_str(&themes_json).unwrap_or_default();
    let state = build_state(UsageSnapshot::default(), themes);
    let styles = state.rn_styles_for(&selector, &classes);

    match serde_json::to_string(&styles) {
        Ok(json) => match std::ffi::CString::new(json) {
            Ok(c_str) => c_str.into_raw(),
            Err(_) => std::ptr::null_mut(),
        },
        Err(_) => std::ptr::null_mut(),
    }
}

/// Get default state as JSON
#[no_mangle]
pub extern "C" fn themed_styler_get_default_state() -> *mut std::os::raw::c_char {
    let state = State::default_state();
    match serde_json::to_string(&state.to_json()) {
        Ok(json) => match std::ffi::CString::new(json) {
            Ok(c_str) => c_str.into_raw(),
            Err(_) => std::ptr::null_mut(),
        },
        Err(_) => std::ptr::null_mut(),
    }
}

/// Get version
#[no_mangle]
pub extern "C" fn themed_styler_version() -> *mut std::os::raw::c_char {
    match std::ffi::CString::new(version()) {
        Ok(c_str) => c_str.into_raw(),
        Err(_) => std::ptr::null_mut(),
    }
}