Merge branch 'piss-serialization' into 'develop'

Pleroma ISS (interface stylesheets) implementation

See merge request pleroma/pleroma-fe!1943

1 files changed, 153 insertions, 0 deletions

diff --git a/src/services/theme_data/iss_deserializer.js b/src/services/theme_data/iss_deserializer.js
new file mode 100644
index 00000000..5d71f35f
--- /dev/null
+++ b/src/services/theme_data/iss_deserializer.js
@@ -0,0 +1,153 @@
+import { flattenDeep } from 'lodash'
+
+const parseShadow = string => {
+  const modes = ['_full', 'inset', 'x', 'y', 'blur', 'spread', 'color', 'alpha']
+  const regexPrep = [
+    // inset keyword (optional)
+    '^(?:(inset)\\s+)?',
+    // x
+    '(?:(-?[0-9]+(?:\\.[0-9]+)?)\\s+)',
+    // y
+    '(?:(-?[0-9]+(?:\\.[0-9]+)?)\\s+)',
+    // blur (optional)
+    '(?:(-?[0-9]+(?:\\.[0-9]+)?)\\s+)?',
+    // spread (optional)
+    '(?:(-?[0-9]+(?:\\.[0-9]+)?)\\s+)?',
+    // either hex, variable or function
+    '(#[0-9a-f]{6}|--[a-z\\-_]+|\\$[a-z\\-()_]+)',
+    // opacity (optional)
+    '(?:\\s+\\/\\s+([0-9]+(?:\\.[0-9]+)?)\\s*)?$'
+  ].join('')
+  const regex = new RegExp(regexPrep, 'gis') // global, (stable) indices, single-string
+  const result = regex.exec(string)
+  if (result == null) {
+    return string
+  } else {
+    const numeric = new Set(['x', 'y', 'blur', 'spread', 'alpha'])
+    const { x, y, blur, spread, alpha, inset, color } = Object.fromEntries(modes.map((mode, i) => {
+      if (numeric.has(mode)) {
+        return [mode, Number(result[i])]
+      } else if (mode === 'inset') {
+        return [mode, !!result[i]]
+      } else {
+        return [mode, result[i]]
+      }
+    }).filter(([k, v]) => v !== false).slice(1))
+
+    return { x, y, blur, spread, color, alpha, inset }
+  }
+}
+// this works nearly the same as HTML tree converter
+const parseIss = (input) => {
+  const buffer = [{ selector: null, content: [] }]
+  let textBuffer = ''
+
+  const getCurrentBuffer = () => {
+    let current = buffer[buffer.length - 1]
+    if (current == null) {
+      current = { selector: null, content: [] }
+    }
+    return current
+  }
+
+  // Processes current line buffer, adds it to output buffer and clears line buffer
+  const flushText = (kind) => {
+    if (textBuffer === '') return
+    if (kind === 'content') {
+      getCurrentBuffer().content.push(textBuffer.trim())
+    } else {
+      getCurrentBuffer().selector = textBuffer.trim()
+    }
+    textBuffer = ''
+  }
+
+  for (let i = 0; i < input.length; i++) {
+    const char = input[i]
+
+    if (char === ';') {
+      flushText('content')
+    } else if (char === '{') {
+      flushText('header')
+    } else if (char === '}') {
+      flushText('content')
+      buffer.push({ selector: null, content: [] })
+      textBuffer = ''
+    } else {
+      textBuffer += char
+    }
+  }
+
+  return buffer
+}
+export const deserialize = (input) => {
+  const ast = parseIss(input)
+  const finalResult = ast.filter(i => i.selector != null).map(item => {
+    const { selector, content } = item
+    let stateCount = 0
+    const selectors = selector.split(/,/g)
+    const result = selectors.map(selector => {
+      const output = { component: '' }
+      let currentDepth = null
+
+      selector.split(/ /g).reverse().forEach((fragment, index, arr) => {
+        const fragmentObject = { component: '' }
+
+        let mode = 'component'
+        for (let i = 0; i < fragment.length; i++) {
+          const char = fragment[i]
+          switch (char) {
+            case '.': {
+              mode = 'variant'
+              fragmentObject.variant = ''
+              break
+            }
+            case ':': {
+              mode = 'state'
+              fragmentObject.state = fragmentObject.state || []
+              stateCount++
+              break
+            }
+            default: {
+              if (mode === 'state') {
+                const currentState = fragmentObject.state[stateCount - 1]
+                if (currentState == null) {
+                  fragmentObject.state.push('')
+                }
+                fragmentObject.state[stateCount - 1] += char
+              } else {
+                fragmentObject[mode] += char
+              }
+            }
+          }
+        }
+        if (currentDepth !== null) {
+          currentDepth.parent = { ...fragmentObject }
+          currentDepth = currentDepth.parent
+        } else {
+          Object.keys(fragmentObject).forEach(key => {
+            output[key] = fragmentObject[key]
+          })
+          if (index !== (arr.length - 1)) {
+            output.parent = { component: '' }
+          }
+          currentDepth = output
+        }
+      })
+
+      output.directives = Object.fromEntries(content.map(d => {
+        const [property, value] = d.split(':')
+        let realValue = value.trim()
+        if (property === 'shadow') {
+          realValue = value.split(',').map(v => parseShadow(v.trim()))
+        } if (!Number.isNaN(Number(value))) {
+          realValue = Number(value)
+        }
+        return [property, realValue]
+      }))
+
+      return output
+    })
+    return result
+  })
+  return flattenDeep(finalResult)
+}