From 40ab77680a9dc4fe6b848fc576995c86c6c34f5d Mon Sep 17 00:00:00 2001
From: deepsweet <kir@soulshine.in>
Date: Mon, 17 Dec 2012 22:26:06 +0200
Subject: [PATCH] plugins/cleanupIDs: renamed from removeUnusedIDs; minify used
 IDs (fix #7)

---
 .svgo.yml                                     |   5 +-
 plugins/cleanupIDs.js                         | 194 ++++++++++++++++
 plugins/removeUnusedIDs.js                    | 147 ------------
 ...IDs.01.orig.svg => cleanupIDs.01.orig.svg} |   3 +
 ...01.should.svg => cleanupIDs.01.should.svg} |  11 +-
 ...IDs.02.orig.svg => cleanupIDs.02.orig.svg} |   0
 ...02.should.svg => cleanupIDs.02.should.svg} |   0
 ...IDs.03.orig.svg => cleanupIDs.03.orig.svg} |   0
 ...03.should.svg => cleanupIDs.03.should.svg} |   0
 test/plugins/cleanupIDs.04.orig.svg           | 218 ++++++++++++++++++
 test/plugins/cleanupIDs.04.should.svg         | 218 ++++++++++++++++++
 11 files changed, 644 insertions(+), 152 deletions(-)
 create mode 100644 plugins/cleanupIDs.js
 delete mode 100644 plugins/removeUnusedIDs.js
 rename test/plugins/{removeUnusedIDs.01.orig.svg => cleanupIDs.01.orig.svg} (89%)
 rename test/plugins/{removeUnusedIDs.01.should.svg => cleanupIDs.01.should.svg} (61%)
 rename test/plugins/{removeUnusedIDs.02.orig.svg => cleanupIDs.02.orig.svg} (100%)
 rename test/plugins/{removeUnusedIDs.02.should.svg => cleanupIDs.02.should.svg} (100%)
 rename test/plugins/{removeUnusedIDs.03.orig.svg => cleanupIDs.03.orig.svg} (100%)
 rename test/plugins/{removeUnusedIDs.03.should.svg => cleanupIDs.03.should.svg} (100%)
 create mode 100644 test/plugins/cleanupIDs.04.orig.svg
 create mode 100644 test/plugins/cleanupIDs.04.should.svg

diff --git a/.svgo.yml b/.svgo.yml
index f317693d..f3b65083 100644
--- a/.svgo.yml
+++ b/.svgo.yml
@@ -150,9 +150,12 @@ plugins:
     active: true
     type: full
 
-  - name: removeUnusedIDs
+  - name: cleanupIDs
     active: true
     type: full
+    params:
+      remove: true
+      minify: true
 
 svg2js:
 
diff --git a/plugins/cleanupIDs.js b/plugins/cleanupIDs.js
new file mode 100644
index 00000000..dba8037f
--- /dev/null
+++ b/plugins/cleanupIDs.js
@@ -0,0 +1,194 @@
+'use strict';
+
+var referencesProps = require('./_collections').referencesProps,
+    regReferencesUrl = /^url\(#(.+?)\)$/,
+    regReferencesHref = /^#(.+?)$/,
+    styleOrScript = ['style', 'script'],
+    generateIDchars = [
+        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
+    ],
+    maxIDindex = generateIDchars.length - 1;
+
+/**
+ * Remove unused and minify used IDs
+ * (only if there are no any <style> or <script>).
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ *
+ * @author Kir Belevich
+ */
+exports.cleanupIDs = function(data, params) {
+
+    var currentID,
+        currentIDstring,
+        IDs = {},
+        referencesIDs = {},
+        hasStyleOrScript = false;
+
+    /**
+     * Bananas!
+     *
+     * @param {Array} items input items
+     * @return {Array} output items
+     */
+    function monkeys(items) {
+
+        var i = 0,
+            length = items.content.length;
+
+        while(i < length) {
+
+            var item = items.content[i],
+                match;
+
+            // check if <style> of <script> presents
+            if (item.isElem(styleOrScript)) {
+                hasStyleOrScript = true;
+            }
+
+            // …and don't remove any ID if yes
+            if (!hasStyleOrScript) {
+
+                if (item.isElem()) {
+
+                    item.eachAttr(function(attr) {
+                        // save IDs
+                        if (attr.name === 'id') {
+                            IDs[item.attr('id').value] = item;
+                        }
+
+                        // save IDs url() references
+                        else if (referencesProps.indexOf(attr.name) > -1) {
+                            match = attr.value.match(regReferencesUrl);
+
+                            if (match) {
+                                if (referencesIDs[match[1]]) {
+                                    referencesIDs[match[1]].push(attr);
+                                } else {
+                                    referencesIDs[match[1]] = [attr];
+                                }
+                            }
+                        }
+
+                        // save IDs href references
+                        else if (attr.name === 'xlink:href') {
+                            match = attr.value.match(regReferencesHref);
+
+                            if (match) {
+                                if (referencesIDs[match[1]]) {
+                                    referencesIDs[match[1]].push(attr);
+                                } else {
+                                    referencesIDs[match[1]] = [attr];
+                                }
+                            }
+                        }
+                    });
+
+                }
+
+                // go deeper
+                if (item.content) {
+                    monkeys(item);
+                }
+
+            }
+
+            i++;
+
+        }
+
+        return items;
+
+    }
+
+    data = monkeys(data);
+
+    if (!hasStyleOrScript) {
+
+
+        for (var k in referencesIDs) {
+            if (IDs[k]) {
+
+                // replace referenced IDs with the minified ones
+                if (params.minify) {
+
+                    currentIDstring = getIDstring(currentID = generateID(currentID));
+                    IDs[k].attr('id').value = currentIDstring;
+
+                    referencesIDs[k].forEach(function(attr) {
+                        attr.value = attr.value.replace('#' + k, '#' + currentIDstring);
+                    });
+
+                }
+
+                // don't remove referenced IDs
+                delete IDs[k];
+
+            }
+        }
+
+        // remove non-referenced IDs attributes from elements
+        if (params.remove) {
+
+            for(var ID in IDs) {
+                IDs[ID].removeAttr('id');
+            }
+
+        }
+
+    }
+
+    return data;
+
+};
+
+/**
+ * Generate unique minimal ID.
+ *
+ * @param {Array} [currentID] current ID
+ * @return {Array} generated ID array
+ */
+function generateID(currentID) {
+
+    if (!currentID) return [0];
+
+    currentID[currentID.length - 1]++;
+
+    for(var i = currentID.length - 1; i > 0; i--) {
+        if (currentID[i] > maxIDindex) {
+            currentID[i] = 0;
+
+            if (currentID[i - 1] !== undefined) {
+                currentID[i - 1]++;
+            }
+        }
+    }
+
+    if (currentID[0] > maxIDindex) {
+        currentID[0] = 0;
+        currentID.unshift(0);
+    }
+
+    return currentID;
+
+}
+
+/**
+ * Get string from generated ID array.
+ *
+ * @param {Array} arr input ID array
+ * @return {String} output ID string
+ */
+function getIDstring(arr) {
+
+    var str = '';
+
+    arr.forEach(function(i) {
+        str += generateIDchars[i];
+    });
+
+    return str;
+
+}
diff --git a/plugins/removeUnusedIDs.js b/plugins/removeUnusedIDs.js
deleted file mode 100644
index c7476ea8..00000000
--- a/plugins/removeUnusedIDs.js
+++ /dev/null
@@ -1,147 +0,0 @@
-'use strict';
-
-var referencesProps = require('./_collections').referencesProps,
-    regReferencesUrl = /^url\(#(.+?)\)$/,
-    regReferencesHref = /^#(.+?)$/,
-    styleOrScript = ['style', 'script'];
-
-function replaceLast(str, char) {
-    str = str.split('');
-    str[str.length - 1] = char;
-    return str.join('');
-}
-
-function replaceFirst(str, char) {
-    str = str.split('');
-    str[0] = char;
-    return str.join('');
-}
-
-function generateID(prev) {
-    var next;
-
-    if (prev.charCodeAt(prev.length - 1) === 122) {
-        next = replaceAt(prev, 'A');
-    } else if (prev.charCodeAt(prev.length - 1) === 90) {
-        next = replaceAt(prev, 'A');
-    } else {
-        next = replaceAt(prev, String.fromCharCode(prev.charCodeAt(prev.length - 1) + 1));
-    }
-
-    // if (prev.length === 1) {
-    //     if (prev.charCodeAt(0) === 122) {
-    //         next = String.fromCharCode(65);
-    //     } else if (prev.charCodeAt(0) === 90) {
-    //         next = 'aa';
-    //     }
-    // } else if (prev.length === 2) {
-
-    // }
-}
-
-/**
- * Remove unused IDs
- * (only if there are no any <style> or <script>).
- *
- * @param {Object} item current iteration item
- * @return {Boolean} if false, item will be filtered out
- *
- * @author Kir Belevich
- */
-exports.removeUnusedIDs = function(data) {
-
-    var IDs = {},
-        referencesIDs = [],
-        hasStyleOrScript = false;
-
-    /**
-     * Bananas!
-     *
-     * @param {Array} items input items
-     * @return {Array} output items
-     */
-    function monkeys(items) {
-
-        var i = 0,
-            length = items.content.length;
-
-        while(i < length) {
-
-            var item = items.content[i],
-                match;
-
-            // check if <style> of <script> presents
-            if (item.isElem(styleOrScript)) {
-                hasStyleOrScript = true;
-            }
-
-            // …and don't remove any ID if yes
-            if (!hasStyleOrScript) {
-
-                if (item.isElem()) {
-
-                    item.eachAttr(function(attr) {
-                        // save IDs
-                        if (attr.name === 'id') {
-                            IDs[item.attr('id').value] = item;
-                        }
-
-                        // save IDs url() references
-                        else if (referencesProps.indexOf(attr.name) > -1) {
-                            match = attr.value.match(regReferencesUrl);
-
-                            if (match && referencesIDs.indexOf(match[1]) === -1) {
-                                referencesIDs.push(match[1]);
-                            }
-                        }
-
-                        // save IDs href references
-                        else if (attr.name === 'xlink:href') {
-                            match = attr.value.match(regReferencesHref);
-
-                            if (match && referencesIDs.indexOf(match[1]) === -1) {
-                                referencesIDs.push(match[1]);
-                            }
-                        }
-                    });
-
-                }
-
-                // go deeper
-                if (item.content) {
-                    monkeys(item);
-                }
-
-            }
-
-            i++;
-
-        }
-
-        return items;
-
-    }
-
-    data = monkeys(data);
-
-    if (!hasStyleOrScript) {
-
-        // don't remove referenced IDs
-        if (referencesIDs.length) {
-            referencesIDs.forEach(function(referencesID) {
-                delete IDs[referencesID];
-            });
-        }
-
-        // remove not referenced IDs from elements
-        if (Object.keys(IDs).length) {
-            for(var ID in IDs) {
-                IDs[ID].removeAttr('id');
-            }
-        }
-
-    }
-
-    return data;
-
-};
diff --git a/test/plugins/removeUnusedIDs.01.orig.svg b/test/plugins/cleanupIDs.01.orig.svg
similarity index 89%
rename from test/plugins/removeUnusedIDs.01.orig.svg
rename to test/plugins/cleanupIDs.01.orig.svg
index 77558cb8..f6e0a2fe 100644
--- a/test/plugins/removeUnusedIDs.01.orig.svg
+++ b/test/plugins/cleanupIDs.01.orig.svg
@@ -12,4 +12,7 @@
         <circle id="circle001" fill="url(#gradient001)" cx="60" cy="60" r="50"/>
         <tref xlink:href="#referencedText"/>
     </g>
+    <g>
+        <tref xlink:href="#referencedText"/>
+    </g>
 </svg>
diff --git a/test/plugins/removeUnusedIDs.01.should.svg b/test/plugins/cleanupIDs.01.should.svg
similarity index 61%
rename from test/plugins/removeUnusedIDs.01.should.svg
rename to test/plugins/cleanupIDs.01.should.svg
index da9741bb..e349c172 100644
--- a/test/plugins/removeUnusedIDs.01.should.svg
+++ b/test/plugins/cleanupIDs.01.should.svg
@@ -1,15 +1,18 @@
 <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
     <defs>
-        <linearGradient id="gradient001">
+        <linearGradient id="a">
             <stop offset="5%" stop-color="#F60"/>
             <stop offset="95%" stop-color="#FF6"/>
         </linearGradient>
-        <text id="referencedText">
+        <text id="b">
             referenced text
         </text>
     </defs>
     <g>
-        <circle fill="url(#gradient001)" cx="60" cy="60" r="50"/>
-        <tref xlink:href="#referencedText"/>
+        <circle fill="url(#a)" cx="60" cy="60" r="50"/>
+        <tref xlink:href="#b"/>
+    </g>
+    <g>
+        <tref xlink:href="#b"/>
     </g>
 </svg>
diff --git a/test/plugins/removeUnusedIDs.02.orig.svg b/test/plugins/cleanupIDs.02.orig.svg
similarity index 100%
rename from test/plugins/removeUnusedIDs.02.orig.svg
rename to test/plugins/cleanupIDs.02.orig.svg
diff --git a/test/plugins/removeUnusedIDs.02.should.svg b/test/plugins/cleanupIDs.02.should.svg
similarity index 100%
rename from test/plugins/removeUnusedIDs.02.should.svg
rename to test/plugins/cleanupIDs.02.should.svg
diff --git a/test/plugins/removeUnusedIDs.03.orig.svg b/test/plugins/cleanupIDs.03.orig.svg
similarity index 100%
rename from test/plugins/removeUnusedIDs.03.orig.svg
rename to test/plugins/cleanupIDs.03.orig.svg
diff --git a/test/plugins/removeUnusedIDs.03.should.svg b/test/plugins/cleanupIDs.03.should.svg
similarity index 100%
rename from test/plugins/removeUnusedIDs.03.should.svg
rename to test/plugins/cleanupIDs.03.should.svg
diff --git a/test/plugins/cleanupIDs.04.orig.svg b/test/plugins/cleanupIDs.04.orig.svg
new file mode 100644
index 00000000..e99b5b48
--- /dev/null
+++ b/test/plugins/cleanupIDs.04.orig.svg
@@ -0,0 +1,218 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <defs>
+        <text id="test01">
+            referenced text
+        </text>
+        <text id="test02">
+            referenced text
+        </text>
+        <text id="test03">
+            referenced text
+        </text>
+        <text id="test04">
+            referenced text
+        </text>
+        <text id="test05">
+            referenced text
+        </text>
+        <text id="test06">
+            referenced text
+        </text>
+        <text id="test07">
+            referenced text
+        </text>
+        <text id="test08">
+            referenced text
+        </text>
+        <text id="test09">
+            referenced text
+        </text>
+        <text id="test10">
+            referenced text
+        </text>
+        <text id="test11">
+            referenced text
+        </text>
+        <text id="test12">
+            referenced text
+        </text>
+        <text id="test13">
+            referenced text
+        </text>
+        <text id="test14">
+            referenced text
+        </text>
+        <text id="test15">
+            referenced text
+        </text>
+        <text id="test16">
+            referenced text
+        </text>
+        <text id="test17">
+            referenced text
+        </text>
+        <text id="test18">
+            referenced text
+        </text>
+        <text id="test19">
+            referenced text
+        </text>
+        <text id="test20">
+            referenced text
+        </text>
+        <text id="test21">
+            referenced text
+        </text>
+        <text id="test22">
+            referenced text
+        </text>
+        <text id="test23">
+            referenced text
+        </text>
+        <text id="test24">
+            referenced text
+        </text>
+        <text id="test25">
+            referenced text
+        </text>
+        <text id="test26">
+            referenced text
+        </text>
+        <text id="test27">
+            referenced text
+        </text>
+        <text id="test28">
+            referenced text
+        </text>
+        <text id="test29">
+            referenced text
+        </text>
+        <text id="test30">
+            referenced text
+        </text>
+        <text id="test31">
+            referenced text
+        </text>
+        <text id="test32">
+            referenced text
+        </text>
+        <text id="test33">
+            referenced text
+        </text>
+        <text id="test34">
+            referenced text
+        </text>
+        <text id="test35">
+            referenced text
+        </text>
+        <text id="test36">
+            referenced text
+        </text>
+        <text id="test37">
+            referenced text
+        </text>
+        <text id="test38">
+            referenced text
+        </text>
+        <text id="test39">
+            referenced text
+        </text>
+        <text id="test40">
+            referenced text
+        </text>
+        <text id="test41">
+            referenced text
+        </text>
+        <text id="test42">
+            referenced text
+        </text>
+        <text id="test43">
+            referenced text
+        </text>
+        <text id="test44">
+            referenced text
+        </text>
+        <text id="test45">
+            referenced text
+        </text>
+        <text id="test46">
+            referenced text
+        </text>
+        <text id="test47">
+            referenced text
+        </text>
+        <text id="test48">
+            referenced text
+        </text>
+        <text id="test49">
+            referenced text
+        </text>
+        <text id="test50">
+            referenced text
+        </text>
+        <text id="test51">
+            referenced text
+        </text>
+        <text id="test52">
+            referenced text
+        </text>
+        <text id="test53">
+            referenced text
+        </text>
+    </defs>
+    <tref xlink:href="#test01"/>
+    <tref xlink:href="#test01"/>
+    <tref xlink:href="#test01"/>
+    <tref xlink:href="#test02"/>
+    <tref xlink:href="#test03"/>
+    <tref xlink:href="#test04"/>
+    <tref xlink:href="#test05"/>
+    <tref xlink:href="#test06"/>
+    <tref xlink:href="#test07"/>
+    <tref xlink:href="#test08"/>
+    <tref xlink:href="#test09"/>
+    <tref xlink:href="#test10"/>
+    <tref xlink:href="#test11"/>
+    <tref xlink:href="#test12"/>
+    <tref xlink:href="#test13"/>
+    <tref xlink:href="#test14"/>
+    <tref xlink:href="#test15"/>
+    <tref xlink:href="#test16"/>
+    <tref xlink:href="#test17"/>
+    <tref xlink:href="#test18"/>
+    <tref xlink:href="#test19"/>
+    <tref xlink:href="#test20"/>
+    <tref xlink:href="#test21"/>
+    <tref xlink:href="#test22"/>
+    <tref xlink:href="#test23"/>
+    <tref xlink:href="#test24"/>
+    <tref xlink:href="#test25"/>
+    <tref xlink:href="#test26"/>
+    <tref xlink:href="#test27"/>
+    <tref xlink:href="#test28"/>
+    <tref xlink:href="#test29"/>
+    <tref xlink:href="#test30"/>
+    <tref xlink:href="#test31"/>
+    <tref xlink:href="#test32"/>
+    <tref xlink:href="#test33"/>
+    <tref xlink:href="#test34"/>
+    <tref xlink:href="#test35"/>
+    <tref xlink:href="#test36"/>
+    <tref xlink:href="#test37"/>
+    <tref xlink:href="#test38"/>
+    <tref xlink:href="#test39"/>
+    <tref xlink:href="#test40"/>
+    <tref xlink:href="#test41"/>
+    <tref xlink:href="#test42"/>
+    <tref xlink:href="#test43"/>
+    <tref xlink:href="#test44"/>
+    <tref xlink:href="#test45"/>
+    <tref xlink:href="#test46"/>
+    <tref xlink:href="#test47"/>
+    <tref xlink:href="#test48"/>
+    <tref xlink:href="#test49"/>
+    <tref xlink:href="#test50"/>
+    <tref xlink:href="#test51"/>
+    <tref xlink:href="#test52"/>
+    <tref xlink:href="#test53"/>
+</svg>
diff --git a/test/plugins/cleanupIDs.04.should.svg b/test/plugins/cleanupIDs.04.should.svg
new file mode 100644
index 00000000..ffd42209
--- /dev/null
+++ b/test/plugins/cleanupIDs.04.should.svg
@@ -0,0 +1,218 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <defs>
+        <text id="a">
+            referenced text
+        </text>
+        <text id="b">
+            referenced text
+        </text>
+        <text id="c">
+            referenced text
+        </text>
+        <text id="d">
+            referenced text
+        </text>
+        <text id="e">
+            referenced text
+        </text>
+        <text id="f">
+            referenced text
+        </text>
+        <text id="g">
+            referenced text
+        </text>
+        <text id="h">
+            referenced text
+        </text>
+        <text id="i">
+            referenced text
+        </text>
+        <text id="j">
+            referenced text
+        </text>
+        <text id="k">
+            referenced text
+        </text>
+        <text id="l">
+            referenced text
+        </text>
+        <text id="m">
+            referenced text
+        </text>
+        <text id="n">
+            referenced text
+        </text>
+        <text id="o">
+            referenced text
+        </text>
+        <text id="p">
+            referenced text
+        </text>
+        <text id="q">
+            referenced text
+        </text>
+        <text id="r">
+            referenced text
+        </text>
+        <text id="s">
+            referenced text
+        </text>
+        <text id="t">
+            referenced text
+        </text>
+        <text id="u">
+            referenced text
+        </text>
+        <text id="v">
+            referenced text
+        </text>
+        <text id="w">
+            referenced text
+        </text>
+        <text id="x">
+            referenced text
+        </text>
+        <text id="y">
+            referenced text
+        </text>
+        <text id="z">
+            referenced text
+        </text>
+        <text id="A">
+            referenced text
+        </text>
+        <text id="B">
+            referenced text
+        </text>
+        <text id="C">
+            referenced text
+        </text>
+        <text id="D">
+            referenced text
+        </text>
+        <text id="E">
+            referenced text
+        </text>
+        <text id="F">
+            referenced text
+        </text>
+        <text id="G">
+            referenced text
+        </text>
+        <text id="H">
+            referenced text
+        </text>
+        <text id="I">
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