From e24d08acd14059934e38f59f353c046b804afcf6 Mon Sep 17 00:00:00 2001
From: John Schember <john@nachtimwald.com>
Date: Fri, 21 Jan 2011 20:36:29 -0500
Subject: [PATCH] Implement all of ticket #4486: Search next and preious in
 Regex helper.

---
 src/calibre/gui2/convert/regex_builder.py |  50 +++++++-
 src/calibre/gui2/convert/regex_builder.ui | 137 +++++++++++++++++-----
 2 files changed, 157 insertions(+), 30 deletions(-)

diff --git a/src/calibre/gui2/convert/regex_builder.py b/src/calibre/gui2/convert/regex_builder.py
index ca6e429176..8e75fb9691 100644
--- a/src/calibre/gui2/convert/regex_builder.py
+++ b/src/calibre/gui2/convert/regex_builder.py
@@ -35,6 +35,10 @@ class RegexBuilder(QDialog, Ui_RegexBuilder):
         self.connect(self.button_box, SIGNAL('clicked(QAbstractButton*)'), self.button_clicked)
         self.connect(self.regex, SIGNAL('textChanged(QString)'), self.regex_valid)
         self.connect(self.test, SIGNAL('clicked()'), self.do_test)
+        self.connect(self.previous, SIGNAL('clicked()'), self.goto_previous)
+        self.connect(self.next, SIGNAL('clicked()'), self.goto_next)
+        
+        self.match_locs = []
 
     def regex_valid(self):
         regex = unicode(self.regex.text())
@@ -42,17 +46,23 @@ class RegexBuilder(QDialog, Ui_RegexBuilder):
             try:
                 re.compile(regex)
                 self.regex.setStyleSheet('QLineEdit { color: black; background-color: rgba(0,255,0,20%); }')
+                return True
             except:
                 self.regex.setStyleSheet('QLineEdit { color: black; background-color: rgb(255,0,0,20%); }')
-                return False
         else:
             self.regex.setStyleSheet('QLineEdit { color: black; background-color: white; }')
             self.preview.setExtraSelections([])
-            return False
-        return True
+        
+        self.match_locs = []
+        self.next.setEnabled(False)
+        self.previous.setEnabled(False)
+        self.occurances.setText('0')
+        
+        return False
 
     def do_test(self):
         selections = []
+        self.match_locs = []
         if self.regex_valid():
             text = unicode(self.preview.toPlainText())
             regex = unicode(self.regex.text())
@@ -66,9 +76,43 @@ class RegexBuilder(QDialog, Ui_RegexBuilder):
                     es.cursor.setPosition(match.start(), QTextCursor.MoveAnchor)
                     es.cursor.setPosition(match.end(), QTextCursor.KeepAnchor)
                     selections.append(es)
+                    self.match_locs.append((match.start(), match.end()))
             except:
                 pass
         self.preview.setExtraSelections(selections)
+        if self.match_locs:
+            self.next.setEnabled(True)
+            self.previous.setEnabled(True)
+        self.occurances.setText('%s' % len(self.match_locs))
+
+    def goto_previous(self):
+        pos = self.preview.textCursor().position()
+        if self.match_locs:
+            match_loc = len(self.match_locs) - 1
+            for i in xrange(len(self.match_locs) - 1, -1, -1):
+                loc = self.match_locs[i][1]
+                if pos > loc:
+                    match_loc = i
+                    break
+            self.goto_loc(self.match_locs[match_loc][1], operation=QTextCursor.Left, n=self.match_locs[match_loc][1] - self.match_locs[match_loc][0])
+    
+    def goto_next(self):
+        pos = self.preview.textCursor().position()
+        if self.match_locs:
+            match_loc = 0
+            for i in xrange(len(self.match_locs)):
+                loc = self.match_locs[i][0]
+                if pos < loc:
+                    match_loc = i
+                    break
+            self.goto_loc(self.match_locs[match_loc][0], n=self.match_locs[match_loc][1] - self.match_locs[match_loc][0])
+
+    def goto_loc(self, loc, operation=QTextCursor.Right, mode=QTextCursor.KeepAnchor, n=0):
+        cursor = QTextCursor(self.preview.document())
+        cursor.setPosition(loc)
+        if n:
+            cursor.movePosition(operation, mode, n)
+        self.preview.setTextCursor(cursor)
 
     def select_format(self, db, book_id):
         format = None
diff --git a/src/calibre/gui2/convert/regex_builder.ui b/src/calibre/gui2/convert/regex_builder.ui
index af17917676..bbb08454e9 100644
--- a/src/calibre/gui2/convert/regex_builder.ui
+++ b/src/calibre/gui2/convert/regex_builder.ui
@@ -6,15 +6,102 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>662</width>
-    <height>505</height>
+    <width>580</width>
+    <height>503</height>
    </rect>
   </property>
   <property name="windowTitle">
    <string>Regex Builder</string>
   </property>
-  <layout class="QGridLayout" name="gridLayout">
-   <item row="1" column="0" colspan="5">
+  <layout class="QVBoxLayout" name="verticalLayout_2">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_6">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Regex:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <layout class="QHBoxLayout" name="horizontalLayout">
+       <item>
+        <widget class="QLineEdit" name="regex"/>
+       </item>
+       <item>
+        <widget class="QPushButton" name="test">
+         <property name="text">
+          <string>Test</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_5">
+     <item>
+      <widget class="QLabel" name="label_3">
+       <property name="text">
+        <string>Occurances:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="occurances">
+       <property name="text">
+        <string>0</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer_2">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>298</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <layout class="QHBoxLayout" name="horizontalLayout_3">
+       <item>
+        <widget class="QLabel" name="label_2">
+         <property name="text">
+          <string>Goto:</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QPushButton" name="previous">
+         <property name="enabled">
+          <bool>false</bool>
+         </property>
+         <property name="text">
+          <string>Previous</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QPushButton" name="next">
+         <property name="enabled">
+          <bool>false</bool>
+         </property>
+         <property name="text">
+          <string>Next</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
+    </layout>
+   </item>
+   <item>
     <widget class="QGroupBox" name="groupBox">
      <property name="title">
       <string>Preview</string>
@@ -36,32 +123,28 @@
      </layout>
     </widget>
    </item>
-   <item row="2" column="4">
-    <widget class="QDialogButtonBox" name="button_box">
-     <property name="orientation">
-      <enum>Qt::Horizontal</enum>
-     </property>
-     <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
-     </property>
-    </widget>
-   </item>
-   <item row="0" column="0">
-    <widget class="QLabel" name="label">
-     <property name="text">
-      <string>Regex:</string>
-     </property>
-    </widget>
-   </item>
-   <item row="0" column="1" colspan="4">
-    <layout class="QHBoxLayout" name="horizontalLayout">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_4">
      <item>
-      <widget class="QLineEdit" name="regex"/>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>328</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
      </item>
      <item>
-      <widget class="QPushButton" name="test">
-       <property name="text">
-        <string>Test</string>
+      <widget class="QDialogButtonBox" name="button_box">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="standardButtons">
+        <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
        </property>
       </widget>
      </item>