From 78264a1c345afae1750b798b5fe8bce48edecf04 Mon Sep 17 00:00:00 2001
From: eight <eight04@gmail.com>
Date: Tue, 5 Sep 2017 08:16:08 +0800
Subject: [PATCH] Add: parse more metas, add variable type

---
 js/usercss.js | 145 ++++++++++++++++++++++++++++++--------------------
 1 file changed, 87 insertions(+), 58 deletions(-)

diff --git a/js/usercss.js b/js/usercss.js
index 51a44fed..7ff85ad2 100644
--- a/js/usercss.js
+++ b/js/usercss.js
@@ -4,6 +4,12 @@
 
 // eslint-disable-next-line no-var
 var usercss = (function () {
+  const METAS = [
+    'author', 'description', 'homepageURL', 'icon', 'license', 'name',
+    'namespace', 'noframes', 'preprocessor', 'supportURL', 'var', 'version'
+  ];
+
+  // FIXME: use a real semver module
   function semverTest(a, b) {
     a = a.split('.').map(Number);
     b = b.split('.').map(Number);
@@ -27,23 +33,6 @@ var usercss = (function () {
     return 0;
   }
 
-  function guessType(value) {
-    if (/^url\(.+\)$/i.test(value)) {
-      return 'image';
-    }
-    if (/^#[0-9a-f]{3,8}$/i.test(value)) {
-      return 'color';
-    }
-    if (/^hsla?\(.+\)$/i.test(value)) {
-      return 'color';
-    }
-    if (/^rgba?\(.+\)$/i.test(value)) {
-      return 'color';
-    }
-    // should we use a color-name table to guess type?
-    return 'text';
-  }
-
   const BUILDER = {
     default: {
       postprocess(sections, vars) {
@@ -102,6 +91,70 @@ var usercss = (function () {
     return style;
   }
 
+  function *parseMetas(source) {
+    for (const line of source.split(/\r?\n/)) {
+      const match = line.match(/@(\w+)/);
+      if (!match) {
+        continue;
+      }
+      yield [match[1], line.slice(match.index + match[0].length).trim()];
+    }
+  }
+
+  function matchString(s) {
+    const match = matchFollow(s, /^(?:\w+|(['"])(?:\\\1|.)*?\1)/);
+    match.value = match[1] ? match[0].slice(1, -1) : match[0];
+    return match;
+  }
+
+  function matchFollow(s, re) {
+    const match = s.match(re);
+    match.follow = s.slice(match.index + match[0].length).trim();
+    return match;
+  }
+
+  // FIXME: need color converter
+  function normalizeColor(color) {
+    return color;
+  }
+
+  function parseVar(source) {
+    const result = {
+      label: null,
+      name: null,
+      value: null,
+      default: null,
+      select: null
+    };
+
+    {
+      // type & name
+      const match = matchFollow(source, /^([\w-]+)\s+([\w-]+)/);
+      ([, result.type, result.name] = match);
+      source = match.follow;
+    }
+
+    {
+      // label
+      const match = matchString(source);
+      result.label = match.value;
+      source = match.follow;
+    }
+
+    // value
+    if (result.type === 'color') {
+      source = normalizeColor(source);
+    } else if (result.type === 'select') {
+      const match = matchString(source);
+      result.select = JSON.parse(match.follow);
+      source = match.value;
+    }
+
+    result.default = source;
+
+    return result;
+  }
+
   function _buildMeta(source) {
     const style = {
       name: null,
@@ -111,52 +164,27 @@ var usercss = (function () {
       enabled: true,
       sections: [],
       vars: {},
-      preprocessor: null
+      preprocessor: null,
+      noframes: false
     };
 
     const metaSource = getMetaSource(source);
 
-    const match = (re, callback) => {
-      let m;
-      if (!re.global) {
-        if ((m = metaSource.match(re))) {
-          if (m.length === 1) {
-            callback(m[0]);
-          } else {
-            callback(...m.slice(1));
-          }
-        }
-      } else {
-        const result = [];
-        while ((m = re.exec(metaSource))) {
-          if (m.length <= 2) {
-            result.push(m[m.length - 1]);
-          } else {
-            result.push(m.slice(1));
-          }
-        }
-        if (result.length) {
-          callback(result);
-        }
+    for (const [key, value] of parseMetas(metaSource)) {
+      if (!METAS.includes(key)) {
+        continue;
       }
-    };
-
-    // FIXME: finish all metas
-    match(/@name[^\S\r\n]+(.+?)[^\S\r\n]*$/m, m => (style.name = m));
-    match(/@namespace[^\S\r\n]+(\S+)/, m => (style.namespace = m));
-    match(/@preprocessor[^\S\r\n]+(\S+)/, m => (style.preprocessor = m));
-    match(/@version[^\S\r\n]+(\S+)/, m => (style.version = m));
-    match(
-      /@var[^\S\r\n]+(\S+)[^\S\r\n]+(?:(['"])((?:\\\2|.)*?)\2|(\S+))[^\S\r\n]+(.+?)[^\S\r\n]*$/gm,
-      ms => ms.forEach(([key,, label1, label2, value]) => (
-        style.vars[key] = {
-          type: guessType(value),
-          label: label1 || label2,
-          value: null,  // '.value' holds the value set by users.
-          default: value // '.default' holds the value extract from meta.
-        }
-      ))
-    );
+      if (key === 'noframes') {
+        style.noframes = true;
+      } else if (key === 'var') {
+        const va = parseVar(value);
+        style.vars[va.name] = va;
+      } else if (key === 'homepageURL') {
+        style.url = value;
+      } else {
+        style[key] = value;
+      }
+    }
 
     return style;
   }
@@ -212,6 +240,7 @@ var usercss = (function () {
         throw new Error(chrome.i18n.getMessage('styleMissingMeta', prop));
       }
     }
+    // FIXME: validate variable formats
   }
 
   return {buildMeta, buildCode, semverTest};