Updated themeJS

1 files changed, 170 insertions, 0 deletions

diff --git a/scripts/lib/theme.js b/scripts/lib/theme.js
new file mode 100644
index 0000000..7d4ac79
--- /dev/null
+++ b/scripts/lib/theme.js
@@ -0,0 +1,170 @@
+'use strict'
+
+/* global localStorage */
+/* global FileReader */
+/* global DOMParser */
+
+function Theme (client) {
+  this.el = document.createElement('style')
+  this.el.type = 'text/css'
+
+  this.active = {}
+  this.default = {
+    background: '#eeeeee',
+    f_high: '#0a0a0a',
+    f_med: '#4a4a4a',
+    f_low: '#6a6a6a',
+    f_inv: '#111111',
+    b_high: '#a1a1a1',
+    b_med: '#c1c1c1',
+    b_low: '#ffffff',
+    b_inv: '#ffb545'
+  }
+
+  // Callbacks
+  this.onLoad = () => {}
+
+  this.install = (host = document.body) => {
+    window.addEventListener('dragover', this.drag)
+    window.addEventListener('drop', this.drop)
+    host.appendChild(this.el)
+  }
+
+  this.start = () => {
+    console.log('Theme', 'Starting..')
+    if (isJson(localStorage.theme)) {
+      const storage = JSON.parse(localStorage.theme)
+      if (isValid(storage)) {
+        console.log('Theme', 'Loading theme in localStorage..')
+        this.load(storage)
+        return
+      }
+    }
+    this.load(this.default)
+  }
+
+  this.open = () => {
+    console.log('Theme', 'Open theme..')
+    const input = document.createElement('input')
+    input.type = 'file'
+    input.onchange = (e) => {
+      this.read(e.target.files[0], this.load)
+    }
+    input.click()
+  }
+
+  this.load = (data) => {
+    const theme = this.parse(data)
+    if (!isValid(theme)) { console.warn('Theme', 'Invalid format'); return }
+    console.log('Theme', 'Loaded theme!')
+    this.el.innerHTML = `:root { 
+      --background: ${theme.background}; 
+      --f_high: ${theme.f_high}; 
+      --f_med: ${theme.f_med}; 
+      --f_low: ${theme.f_low}; 
+      --f_inv: ${theme.f_inv}; 
+      --b_high: ${theme.b_high}; 
+      --b_med: ${theme.b_med}; 
+      --b_low: ${theme.b_low}; 
+      --b_inv: ${theme.b_inv};
+    }`
+    localStorage.setItem('theme', JSON.stringify(theme))
+    this.active = theme
+    if (this.onLoad) {
+      this.onLoad(data)
+    }
+  }
+
+  this.reset = () => {
+    this.load(this.default)
+  }
+
+  this.set = (key, val) => {
+    if (!val) { return }
+    const hex = (`${val}`.substr(0, 1) !== '#' ? '#' : '') + `${val}`
+    if (!isColor(hex)) { console.warn('Theme', `${hex} is not a valid color.`); return }
+    this.active[key] = hex
+  }
+
+  this.get = (key) => {
+    return this.active[key]
+  }
+
+  this.parse = (any) => {
+    if (isValid(any)) { return any }
+    if (isJson(any)) { return JSON.parse(any) }
+    if (isHtml(any)) { return extract(any) }
+  }
+
+  // Drag
+
+  this.drag = (e) => {
+    e.stopPropagation()
+    e.preventDefault()
+    e.dataTransfer.dropEffect = 'copy'
+  }
+
+  this.drop = (e) => {
+    e.preventDefault()
+    const file = e.dataTransfer.files[0]
+    if (file.name.indexOf('.svg') > -1) {
+      this.read(file, this.load)
+    }
+    e.stopPropagation()
+  }
+
+  this.read = (file, callback) => {
+    const reader = new FileReader()
+    reader.onload = (event) => {
+      callback(event.target.result)
+    }
+    reader.readAsText(file, 'UTF-8')
+  }
+
+  // Helpers
+
+  function extract (xml) {
+    const svg = new DOMParser().parseFromString(xml, 'text/xml')
+    try {
+      return {
+        background: svg.getElementById('background').getAttribute('fill'),
+        f_high: svg.getElementById('f_high').getAttribute('fill'),
+        f_med: svg.getElementById('f_med').getAttribute('fill'),
+        f_low: svg.getElementById('f_low').getAttribute('fill'),
+        f_inv: svg.getElementById('f_inv').getAttribute('fill'),
+        b_high: svg.getElementById('b_high').getAttribute('fill'),
+        b_med: svg.getElementById('b_med').getAttribute('fill'),
+        b_low: svg.getElementById('b_low').getAttribute('fill'),
+        b_inv: svg.getElementById('b_inv').getAttribute('fill')
+      }
+    } catch (err) {
+      console.warn('Theme', 'Incomplete SVG Theme', err)
+    }
+  }
+
+  function isValid (json) {
+    if (!json) { return false }
+    if (!json.background || !isColor(json.background)) { return false }
+    if (!json.f_high || !isColor(json.f_high)) { return false }
+    if (!json.f_med || !isColor(json.f_med)) { return false }
+    if (!json.f_low || !isColor(json.f_low)) { return false }
+    if (!json.f_inv || !isColor(json.f_inv)) { return false }
+    if (!json.b_high || !isColor(json.b_high)) { return false }
+    if (!json.b_med || !isColor(json.b_med)) { return false }
+    if (!json.b_low || !isColor(json.b_low)) { return false }
+    if (!json.b_inv || !isColor(json.b_inv)) { return false }
+    return true
+  }
+
+  function isColor (hex) {
+    return /^#([0-9A-F]{3}){1,2}$/i.test(hex)
+  }
+
+  function isJson (text) {
+    try { JSON.parse(text); return true } catch (error) { return false }
+  }
+
+  function isHtml (text) {
+    try { new DOMParser().parseFromString(text, 'text/xml'); return true } catch (error) { return false }
+  }
+}