From 210c8e788340e824ed98dcd2fca7f19483efec5b Mon Sep 17 00:00:00 2001
From: Matthias Leuffen <matthes@leuffen.de>
Date: Wed, 26 Jul 2017 19:02:49 +0200
Subject: [PATCH] Implemented {else} to {if} (#2)

* Added Test for if/else

* Added else construction
---
 .gitignore                        |   1 +
 README.md                         |  22 ++++++-
 src/TextTemplate.php              | 103 ++++++++++++++++++++----------
 test/templates.phpt               |   4 ++
 test/unit/tpls/07_if_else/_in.php |   5 ++
 test/unit/tpls/07_if_else/_in.txt |  12 ++++
 test/unit/tpls/07_if_else/out.txt |   5 ++
 7 files changed, 119 insertions(+), 33 deletions(-)
 create mode 100644 test/unit/tpls/07_if_else/_in.php
 create mode 100644 test/unit/tpls/07_if_else/_in.txt
 create mode 100644 test/unit/tpls/07_if_else/out.txt

diff --git a/.gitignore b/.gitignore
index f417e74..e26f5d7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /.idea
 /vendor
+/test/output
\ No newline at end of file
diff --git a/README.md b/README.md
index ccccba1..644f186 100644
--- a/README.md
+++ b/README.md
@@ -26,10 +26,14 @@ TextTemplate supports infinite-nested loops and sequences.
 
 // 1. Define the Template
 $tplStr = <<<EOT
+
 Hello World {= name }
 {if name == "Matthias"}
 Hallo {= name | capitalize }
+{else}
+You are not Matthias
 {/if}
+
 EOT;
 
 // 2. Define the Data for the Template
@@ -67,6 +71,7 @@ _TextTemplate uses Phing to build the phar-archives and gzip them. Just execute
 
 
 
+
 ## Value injection
 
 Use the value Tag
@@ -82,7 +87,6 @@ To access array elements or objects use "." to access sub-elements:
  ```
  {= users.0.name}
  ```
- 
 
 
 ### Adding Filters
@@ -166,6 +170,14 @@ Hello World
 
 Limitation: Logical connections like OR / AND are not possible at the moment. Maybe in the future.
 
+## Conditions (else)
+```
+{if someVarName == "SomeValue"}
+Hello World
+{else}
+Goodbye World
+{/if}
+```
 
 ## Debugging the Parameters
 
@@ -196,6 +208,14 @@ And we got quite good results:
 
 
 
+## Contributing
+
+If you want to contribute, please send your Merge-Request or open
+a gitlab ticket.
+
+- __Bugs & Feature-Request:__ [GitHub Tickets](https://github.com/dermatthes/text-template/issues)
+
+
 ## About
 Text-Template was written by Matthias Leuffen <http://leuffen.de>
 
diff --git a/src/TextTemplate.php b/src/TextTemplate.php
index 2e78a43..d4824d6 100644
--- a/src/TextTemplate.php
+++ b/src/TextTemplate.php
@@ -89,6 +89,20 @@ public function addFilter ($filterName, callable $filterFn) {
     }
 
 
+    public function _replaceElseIf ($input) {
+        $lines = explode("\n", $input);
+        for ($li=0; $li < count ($lines); $li++) {
+            $lines[$li] = preg_replace_callback('/\{else\}/im',
+                function ($matches) use (&$nestingIndex, &$indexCounter, &$li) {
+                    return "{/if}{if ::NL_ELSE_FALSE}";
+                },
+                $lines[$li]
+            );
+
+        }
+        return implode ("\n", $lines);
+    }
+
     /**
      * Tag-Nesting is done by initially adding an index to both the opening and the
      * closing tag. (By the way some cleanup is done)
@@ -266,58 +280,83 @@ private function _getItemValue ($compName, $context) {
     }
 
 
-    private function _runIf ($context, $content, $cmdParam, $softFail=TRUE) {
+    private function _runIf ($context, $content, $cmdParam, $softFail=TRUE, &$ifConditionDidMatch) {
         //echo $cmdParam;
-        if ( ! preg_match('/([\"\']?.*?[\"\']?)\s*(==|<|>|!=)\s*([\"\']?.*[\"\']?)/i', $cmdParam, $matches))
-            return "!! Invalid command sequence: '$cmdParam' !!";
-
-        //print_r ($matches);
-
-        $comp1 = $this->_getItemValue(trim ($matches[1]), $context);
-        $comp2 = $this->_getItemValue(trim ($matches[3]), $context);
-
-        //decho $comp1 . $comp2;
-
-        $doIf = FALSE;
-        switch ($matches[2]) {
-            case "==":
-                $doIf = ($comp1 == $comp2);
-                break;
-            case "!=":
-                $doIf = ($comp1 != $comp2);
-                break;
-            case "<":
-                $doIf = ($comp1 < $comp2);
-                break;
-            case ">":
-                $doIf = ($comp1 > $comp2);
-                break;
+        $doIf = false;
+
+        if (trim ($cmdParam) == "::NL_ELSE_FALSE") {
+            // This is the {else} path of a if construction
+            if ($ifConditionDidMatch == false)
+                $doIf = true; // Run the block if
+
+        } else {
+
+            if ( ! preg_match('/([\"\']?.*?[\"\']?)\s*(==|<|>|!=)\s*([\"\']?.*[\"\']?)/i', $cmdParam, $matches)) {
+                return "!! Invalid command sequence: '$cmdParam' !!";
+            }
+
+            //print_r ($matches);
+
+            $comp1 = $this->_getItemValue(trim($matches[1]), $context);
+            $comp2 = $this->_getItemValue(trim($matches[3]), $context);
+
+            //decho $comp1 . $comp2;
+
+
+            switch ($matches[2]) {
+                case "==":
+                    $doIf = ($comp1 == $comp2);
+                    break;
+                case "!=":
+                    $doIf = ($comp1 != $comp2);
+                    break;
+                case "<":
+                    $doIf = ($comp1 < $comp2);
+                    break;
+                case ">":
+                    $doIf = ($comp1 > $comp2);
+                    break;
+            }
         }
 
         if ( ! $doIf)
             return "";
 
+        $ifConditionDidMatch = true; // Skip further else / elseif execution
         $content = $this->_parseBlock($context, $content, $softFail);
         $content = $this->_parseValueOfTags($context, $content, $softFail);
         return $content;
 
     }
 
+    public function _runIfElse ($context, $content, $softFail=TRUE, &$ifConditionDidMatch) {
+        if ($ifConditionDidMatch == true)
+            return "";
+        $ifConditionDidMatch = true; // Skip further else / elseif execution
+        $content = $this->_parseBlock($context, $content, $softFail);
+        $content = $this->_parseValueOfTags($context, $content, $softFail);
+        return $content;
+    }
+
 
     private function _parseBlock ($context, $block, $softFail=TRUE) {
         // (?!\{): Lookahead Regex: Don't touch double {{
-        $result = preg_replace_callback('/\n?\{(?!=)(([a-z]+)[0-9]+)(.*?)\}(.*?)\n?\{\/\1\}/ism',
-            function ($matches) use ($context, $softFail) {
-                $command = $matches[2];
-                $cmdParam = $matches[3];
-                $content = $matches[4];
+        $ifConditionDidMatch = []; // Array with nesting-Levels
+        $result = preg_replace_callback('/\n?\{(?!=)((?<command>[a-z]+)(?<nestingLevel>[0-9]+))(?<cmdParam>.*?)\}(?<content>.*?)\n?\{\/\1\}/ism',
+            function ($matches) use ($context, $softFail, &$ifConditionDidMatch) {
+                $command = $matches["command"];
+                $cmdParam = $matches["cmdParam"];
+                $content = $matches["content"];
+                $nestingLevel = $matches["nestingLevel"];
 
                 switch ($command) {
                     case "for":
                         return $this->_runFor($context, $content, $cmdParam, $softFail);
 
                     case "if":
-                        return $this->_runIf ($context, $content, $cmdParam, $softFail);
+                        $ifConditionDidMatch[$nestingLevel] = false;
+                        return $this->_runIf ($context, $content, $cmdParam, $softFail, $ifConditionDidMatch[$nestingLevel]);
+
 
                     default:
                         return "!! Invalid command: '$command' !!";
@@ -350,7 +389,7 @@ public function apply ($params, $softFail=TRUE) {
         $text = $this->mTemplateText;
 
         $context = $params;
-
+        $text = $this->_replaceElseIf($text);
         $text = $this->_replaceNestingLevels($text);
 
         $text = $this->_parseBlock($context, $text, $softFail);
diff --git a/test/templates.phpt b/test/templates.phpt
index 1e6a1ab..f34b671 100644
--- a/test/templates.phpt
+++ b/test/templates.phpt
@@ -17,6 +17,10 @@ use Tester\Assert;
 \Tester\Environment::setup();
 
 
+$in = "{ if xyz}{ if zzz}{=value}{ /if}{else}{/if}";
+$tt = new TextTemplate();
+$out = $tt->_replaceElseIf($in);
+Assert::equal("{ if xyz}{ if zzz}{=value}{ /if}{/if}{if ::NL_ELSE_FALSE}{/if}", $out);
 
 $in = "{ if xyz}{ if zzz}{=value}{ /if}{/if}";
 $tt = new TextTemplate();
diff --git a/test/unit/tpls/07_if_else/_in.php b/test/unit/tpls/07_if_else/_in.php
new file mode 100644
index 0000000..162d97a
--- /dev/null
+++ b/test/unit/tpls/07_if_else/_in.php
@@ -0,0 +1,5 @@
+<?php
+
+return [
+    "boolVal" => TRUE
+];
\ No newline at end of file
diff --git a/test/unit/tpls/07_if_else/_in.txt b/test/unit/tpls/07_if_else/_in.txt
new file mode 100644
index 0000000..4a34bb0
--- /dev/null
+++ b/test/unit/tpls/07_if_else/_in.txt
@@ -0,0 +1,12 @@
+1: Start
+{if boolVal == TRUE}
+2: Boolean is true
+{else}
+3: Some Line of Code
+{/if}
+{if boolVal == FALSE}
+4: Boolean is true
+{else}
+5: Some Line of Code
+{/if}
+6: Some other text
\ No newline at end of file
diff --git a/test/unit/tpls/07_if_else/out.txt b/test/unit/tpls/07_if_else/out.txt
new file mode 100644
index 0000000..16fad5c
--- /dev/null
+++ b/test/unit/tpls/07_if_else/out.txt
@@ -0,0 +1,5 @@
+1: Start
+2: Boolean is true
+3: Some Line of Code
+5: Some Line of Code
+6: Some other text
\ No newline at end of file