From 6aad9b40de4002ab061988b21ff1b806ffa1cb9e Mon Sep 17 00:00:00 2001
From: Victor Fernandes <victorvalenca@gmail.com>
Date: Tue, 21 Feb 2017 13:48:10 -0500
Subject: [PATCH 1/9] Finish grammar

---
 PLATYPUS Grammar Specification.md | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 82105ea..7effa17 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -161,13 +161,13 @@
 #### 3.2.2 Selection Statement (`if` statement)
 ```
 <selection statement> ->
-    IF (<conditional expression>) THEN <statements>
+    IF (<conditional expression>) THEN <opt_statements>
     ELSE {<opt_statements>};
 ```
 #### 3.2.3 Iteration Statement (the loop statement)
 ```
 <iteration statement> ->
-    <TBC>
+    USING (<assignment expression> , <conditional expression>, <assignment expression>) REPEAT { <opt_statements> };
 ```
 #### 3.2.4 Input Statement
 ```
@@ -180,7 +180,7 @@
 #### 3.2.5 Output Statement
 ```
 <output statement> ->
-    <TBC>
+    OUTPUT(<opt_variable list> | <opt_string literal>);
 ```
 ### 3.3 Expressions
 #### 3.3.1 Arithmetic Expressions
@@ -222,23 +222,27 @@
 #### 3.3.3 Conditional Expression
 ```
 <conditional expression> ->
-    <logical OR expression>
+    <conditional expression>
+    | <logical AND expression>
+    | <logical OR expression>
 
 <logical OR expression> ->
-    <TBC>
+    <relational expression> .OR. <relational expression>
 
 <logical AND expression> ->
-    <TBC>
+    <relational expression> .AND. <relational expression>
 ```
 #### 3.3.4 Relational Expression
 ```
 <relational expression> ->
     <primary a_relational expression> == <primary a_relational expression>
     | <primary a_relational expression> <= <primary a_relational expression>
+    | <primary a_relational expression> >= <primary a_relational expression>
     | <primary a_relational expression> > <primary a_relational expression>
     | <primary a_relational expression> < <primary a_relational expression>
     | <primary s_relational expression> == <primary s_relational expression>
     | <primary s_relational expression> <= <primary s_relational expression>
+    | <primary s_relational expression> >= <primary s_relational expression>
     | <primary s_relational expression> > <primary s_relational expression>
     | <primary s_relational expression> < <primary s_relational expression>
 
@@ -248,5 +252,6 @@
     | <variable identifier>
 
 <primary s_relational expression> ->
-    <TBC>
+    <string variable identifier>
+    | <string literal>
 ```
\ No newline at end of file

From f8109d40ec709f698a6f00a037d7e04705db2e09 Mon Sep 17 00:00:00 2001
From: Victor Fernandes <victorvalenca@gmail.com>
Date: Tue, 21 Feb 2017 14:25:21 -0500
Subject: [PATCH 2/9] BNF: Add C's syntax for conditional expressions as
 potential solution

---
 .gitattributes                    | 63 +++++++++++++++++++++++++++++++
 PLATYPUS Grammar Specification.md | 16 ++++++++
 buffer/buffer.sln                 | 28 ++++++++++++++
 3 files changed, 107 insertions(+)
 create mode 100644 .gitattributes
 create mode 100644 buffer/buffer.sln

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..1ff0c42
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,63 @@
+###############################################################################
+# Set default behavior to automatically normalize line endings.
+###############################################################################
+* text=auto
+
+###############################################################################
+# Set default behavior for command prompt diff.
+#
+# This is need for earlier builds of msysgit that does not have it on by
+# default for csharp files.
+# Note: This is only used by command line
+###############################################################################
+#*.cs     diff=csharp
+
+###############################################################################
+# Set the merge driver for project and solution files
+#
+# Merging from the command prompt will add diff markers to the files if there
+# are conflicts (Merging from VS is not affected by the settings below, in VS
+# the diff markers are never inserted). Diff markers may cause the following 
+# file extensions to fail to load in VS. An alternative would be to treat
+# these files as binary and thus will always conflict and require user
+# intervention with every merge. To do so, just uncomment the entries below
+###############################################################################
+#*.sln       merge=binary
+#*.csproj    merge=binary
+#*.vbproj    merge=binary
+#*.vcxproj   merge=binary
+#*.vcproj    merge=binary
+#*.dbproj    merge=binary
+#*.fsproj    merge=binary
+#*.lsproj    merge=binary
+#*.wixproj   merge=binary
+#*.modelproj merge=binary
+#*.sqlproj   merge=binary
+#*.wwaproj   merge=binary
+
+###############################################################################
+# behavior for image files
+#
+# image files are treated as binary by default.
+###############################################################################
+#*.jpg   binary
+#*.png   binary
+#*.gif   binary
+
+###############################################################################
+# diff behavior for common document formats
+# 
+# Convert binary document formats to text before diffing them. This feature
+# is only available from the command line. Turn it on by uncommenting the 
+# entries below.
+###############################################################################
+#*.doc   diff=astextplain
+#*.DOC   diff=astextplain
+#*.docx  diff=astextplain
+#*.DOCX  diff=astextplain
+#*.dot   diff=astextplain
+#*.DOT   diff=astextplain
+#*.pdf   diff=astextplain
+#*.PDF   diff=astextplain
+#*.rtf   diff=astextplain
+#*.RTF   diff=astextplain
diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 7effa17..48d3545 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -226,6 +226,22 @@
     | <logical AND expression>
     | <logical OR expression>
 
+
+// BNF from C specification 
+// (translated to PLATYPUS because it does not implement all of C's grammar)
+// source: https://cs.wmich.edu/~gupta/teaching/cs4850/sumII06/The%20syntax%20of%20C%20in%20Backus-Naur%20form.htm
+    <conditional expression> ->
+        <logical OR expression>
+
+    <logical OR expression> ->
+        <logical AND expression>
+        | <logical OR expression> .OR. <relational expression>
+
+    <logical AND expression> ->
+        <logical AND expression> .AND. <relational expression>
+// END BNF from C specification
+
+
 <logical OR expression> ->
     <relational expression> .OR. <relational expression>
 
diff --git a/buffer/buffer.sln b/buffer/buffer.sln
new file mode 100644
index 0000000..49f3f35
--- /dev/null
+++ b/buffer/buffer.sln
@@ -0,0 +1,28 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "buffer", "buffer\buffer.vcxproj", "{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Debug|x64.ActiveCfg = Debug|x64
+		{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Debug|x64.Build.0 = Debug|x64
+		{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Debug|x86.ActiveCfg = Debug|Win32
+		{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Debug|x86.Build.0 = Debug|Win32
+		{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Release|x64.ActiveCfg = Release|x64
+		{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Release|x64.Build.0 = Release|x64
+		{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Release|x86.ActiveCfg = Release|Win32
+		{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

From 1929d2760242d4cc324a9efc50b61db2f34a8178 Mon Sep 17 00:00:00 2001
From: Victor Fernandes <victorvalenca@gmail.com>
Date: Tue, 21 Feb 2017 14:29:51 -0500
Subject: [PATCH 3/9] BNF: Fix <logical AND expression>

---
 PLATYPUS Grammar Specification.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 48d3545..064101b 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -238,7 +238,8 @@
         | <logical OR expression> .OR. <relational expression>
 
     <logical AND expression> ->
-        <logical AND expression> .AND. <relational expression>
+        <relational expression>
+        | <logical AND expression> .AND. <relational expression>
 // END BNF from C specification
 
 

From 3a0a4772259dc49b5e9eb174244e795687ce9c46 Mon Sep 17 00:00:00 2001
From: Victor Fernandes <victorvalenca@gmail.com>
Date: Tue, 21 Feb 2017 14:46:11 -0500
Subject: [PATCH 4/9] BNF: Fix MAJOR ERROR in operators

---
 PLATYPUS Grammar Specification.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 064101b..56fcb47 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -123,6 +123,9 @@
     + - * /
 
 <string concatenation operator> -> one of
+    <<
+    
+<relational operator> -> one of
     > < == <>
 
 <logical operator> ->

From 6b6226bba92114985bcc076a49307830931b18cf Mon Sep 17 00:00:00 2001
From: Victor Fernandes <victorvalenca@gmail.com>
Date: Tue, 21 Feb 2017 14:54:07 -0500
Subject: [PATCH 5/9] BNF correction: No >= or <= allowed in this spec

---
 PLATYPUS Grammar Specification.md | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 56fcb47..256754e 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -124,7 +124,7 @@
 
 <string concatenation operator> -> one of
     <<
-    
+
 <relational operator> -> one of
     > < == <>
 
@@ -255,16 +255,8 @@
 #### 3.3.4 Relational Expression
 ```
 <relational expression> ->
-    <primary a_relational expression> == <primary a_relational expression>
-    | <primary a_relational expression> <= <primary a_relational expression>
-    | <primary a_relational expression> >= <primary a_relational expression>
-    | <primary a_relational expression> > <primary a_relational expression>
-    | <primary a_relational expression> < <primary a_relational expression>
-    | <primary s_relational expression> == <primary s_relational expression>
-    | <primary s_relational expression> <= <primary s_relational expression>
-    | <primary s_relational expression> >= <primary s_relational expression>
-    | <primary s_relational expression> > <primary s_relational expression>
-    | <primary s_relational expression> < <primary s_relational expression>
+    <primary a_relational expression> <relational operator> <primary a_relational expression>
+    | <primary s_relational expression> <relational operator> <primary s_relational expression>
 
 <primary a_relational expression> ->
     <floating-point literal>

From 321cb4a95998ba4d95eb1a9aa839684f68d0d72c Mon Sep 17 00:00:00 2001
From: Victor Fernandes <victorvalenca@gmail.com>
Date: Tue, 21 Feb 2017 15:08:32 -0500
Subject: [PATCH 6/9] Clean up and remove 'one of's

---
 PLATYPUS Grammar Specification.md | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 256754e..5981456 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -82,7 +82,7 @@
     0 | <non-zero digit>
 
 <non-zero digit> -> one of
-    [1-9]
+    1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
 
 <octal integer literal> ->
     0 <octal digit> <octal digits>
@@ -109,8 +109,8 @@
 ```
 ### 2.9 Separators
 ```
-<separator> -> one of
-    ( ) { } , ; " .
+<separator> ->
+    ( | ) | { | } | , | ; | " |.
 ```
 ### 2.10 Operators
 ```
@@ -119,14 +119,14 @@
     | <relational operator> | <logical operator>
     | <assignment operator>
 
-<arithmetic operator> -> one of
-    + - * /
+<arithmetic operator> ->
+    + | - | * | /
 
-<string concatenation operator> -> one of
+<string concatenation operator> ->
     <<
 
-<relational operator> -> one of
-    > < == <>
+<relational operator> ->
+    > | < | == | <>
 
 <logical operator> ->
     .AND. | .OR.
@@ -224,12 +224,6 @@
 ```
 #### 3.3.3 Conditional Expression
 ```
-<conditional expression> ->
-    <conditional expression>
-    | <logical AND expression>
-    | <logical OR expression>
-
-
 // BNF from C specification 
 // (translated to PLATYPUS because it does not implement all of C's grammar)
 // source: https://cs.wmich.edu/~gupta/teaching/cs4850/sumII06/The%20syntax%20of%20C%20in%20Backus-Naur%20form.htm
@@ -244,13 +238,6 @@
         <relational expression>
         | <logical AND expression> .AND. <relational expression>
 // END BNF from C specification
-
-
-<logical OR expression> ->
-    <relational expression> .OR. <relational expression>
-
-<logical AND expression> ->
-    <relational expression> .AND. <relational expression>
 ```
 #### 3.3.4 Relational Expression
 ```

From 7a371732638bb5fb796907e884ce301005110f14 Mon Sep 17 00:00:00 2001
From: Victor Fernandes <victorvalenca@gmail.com>
Date: Wed, 22 Feb 2017 19:10:15 -0500
Subject: [PATCH 7/9] h

---
 PLATYPUS Grammar Specification.md | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 5981456..506a462 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -2,7 +2,9 @@
 
 ## 2. Lexical Specification (INCOMPLETE)
 
-## NOTE: **This is incredibly incomplete and broken, I am simply writing this down and will fix it as I read along the informal language specification provided to me**
+## NOTE: 
+**This is incomplete, I am simply writing this down and will fix it as I read along the informal language specification provided to me
+This does not follow standard BNF/EBNF syntax, I will rewrite it once I get all the definitions correct and complete.**
 
 ### 2.1 Input Elements and Tokens
 ```
@@ -134,7 +136,7 @@
 <assignment operator> ->
     =
 ```
-## 3. The PLATYPUS Syntatic Specification
+## 3. The PLATYPUS Syntactic Specification
 ### 3.1 PLATYPUS Program
 ```
 <program> ->
@@ -158,8 +160,8 @@
     <assignment expression>
 
 <assignment expression> ->
-    AVID = <arithmetic expression>
-    | SVID = <string expression>
+    <arithmetic variable identifier> = <arithmetic expression>
+    | <string variable identifier> = <string expression>
 ```
 #### 3.2.2 Selection Statement (`if` statement)
 ```
@@ -225,14 +227,14 @@
 #### 3.3.3 Conditional Expression
 ```
 // BNF from C specification 
-// (translated to PLATYPUS because it does not implement all of C's grammar)
+// (adapted to PLATYPUS specification because it does not implement all of C's grammar)
 // source: https://cs.wmich.edu/~gupta/teaching/cs4850/sumII06/The%20syntax%20of%20C%20in%20Backus-Naur%20form.htm
     <conditional expression> ->
         <logical OR expression>
 
     <logical OR expression> ->
         <logical AND expression>
-        | <logical OR expression> .OR. <relational expression>
+        | <logical OR expression> .OR. <logical AND expression>
 
     <logical AND expression> ->
         <relational expression>
@@ -251,6 +253,6 @@
     | <variable identifier>
 
 <primary s_relational expression> ->
-    <string variable identifier>
-    | <string literal>
+    <string literal>
+    | <string variable identifier>
 ```
\ No newline at end of file

From 6b6d084096b9a5369dbd06ef6380c0b7c38cd3b1 Mon Sep 17 00:00:00 2001
From: Victor Fernandes <victorvalenca@gmail.com>
Date: Wed, 22 Feb 2017 19:18:48 -0500
Subject: [PATCH 8/9] BNF: end of statement character

---
 PLATYPUS Grammar Specification.md | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 506a462..65d15f8 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -157,7 +157,7 @@ This does not follow standard BNF/EBNF syntax, I will rewrite it once I get all
 ### 3.3 Assignment Statement
 ```
 <assignment statement> ->
-    <assignment expression>
+    <assignment expression> ;
 
 <assignment expression> ->
     <arithmetic variable identifier> = <arithmetic expression>
@@ -226,8 +226,7 @@ This does not follow standard BNF/EBNF syntax, I will rewrite it once I get all
 ```
 #### 3.3.3 Conditional Expression
 ```
-// BNF from C specification 
-// (adapted to PLATYPUS specification because it does not implement all of C's grammar)
+// BNF from C specification adapted to PLATYPUS
 // source: https://cs.wmich.edu/~gupta/teaching/cs4850/sumII06/The%20syntax%20of%20C%20in%20Backus-Naur%20form.htm
     <conditional expression> ->
         <logical OR expression>

From cd18b511767538dd07013bfd2b954d6e46c81e57 Mon Sep 17 00:00:00 2001
From: Victor Fernandes <victorvalenca@gmail.com>
Date: Wed, 22 Feb 2017 19:23:31 -0500
Subject: [PATCH 9/9] Start converting UBNF (ugly BNF) into BNF

---
 PLATYPUS Grammar Specification.md | 116 +++++++++++++++---------------
 1 file changed, 58 insertions(+), 58 deletions(-)

diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 65d15f8..5e764b5 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -7,147 +7,147 @@
 This does not follow standard BNF/EBNF syntax, I will rewrite it once I get all the definitions correct and complete.**
 
 ### 2.1 Input Elements and Tokens
-```
-<input character> ->
+``` bnf
+<input character> ::=
     ASCII characters but not SEOF
 
-<input> ->
+<input> ::=
     <input elements> SEOF
 
-<input elements> ->
+<input elements> ::=
     <input element> | <input elements> <input element>
 
-<token> ->
+<token> ::=
     <variable identifier> | <keyword> | <floating-point literal>
     | <integer literal> | <string literal> | <separator> | <operator>
 ```
 ### 2.2 White Space
 ```
-<white space> ->
+<white space> ::=
     ASCII SP character (space)
     | ASCII HT character (horizontal tab)
     | ASCII VT character (vertical tab)
     | ASCII FF character (form feed)
     | <line terminator>
 
-<line terminator> ->
+<line terminator> ::=
     CR | LF | CR LF
 ```
 ### 2.3 Comments
 ```
-<comment> ->
+<comment> ::=
     !< <opt_characters in line> <line terminator>
 
-<characters in line> ->
+<characters in line> ::=
     <comment character> | <characters in line> <comment character>
 
-<comment character> ->
+<comment character> ::=
     <input character> but not <line terminator>
 ```
 ### 2.4 Variable Identifiers
 ```
-<variable identifier> ->
+<variable identifier> ::=
     <arithmetic variable identifier> | <string variable identifier>
 
-<arithmetic identifier> ->
+<arithmetic identifier> ::=
     <letter> <opt_letters or digits>
 
-<letters or digits> ->
+<letters or digits> ::=
     <letter or digit> | <letters or digits> <letter or digit>
 
-<letter> -> one of
+<letter> ::= one of
     [a-z][A-Z]
 
-<letter or digit> -> one of
+<letter or digit> ::= one of
     [a-z][A-Z][0-9]
 
-<string variable identifier> ->
+<string variable identifier> ::=
     <arithmetic variable identifier># 
 ```
 ### 2.5 Keywords
 ```
-<keyword> ->
+<keyword> ::=
     PLATYPUS | IF | THEN | ELSE | USING | REPEAT | INPUT | OUTPUT
 ```
 ### 2.6 Integer Literals
 ```
-<integer literal> ->
+<integer literal> ::=
     <decimal integer literal> | <octal integer literal>
 
-<decimal integer literal> ->
+<decimal integer literal> ::=
     0 | <non-zero digit> <opt_digits>
 
-<digits> ->
+<digits> ::=
     <digit> | <digits> <digit>
 
-<digit> ->
+<digit> ::=
     0 | <non-zero digit>
 
-<non-zero digit> -> one of
+<non-zero digit> ::= one of
     1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
 
-<octal integer literal> ->
+<octal integer literal> ::=
     0 <octal digit> <octal digits>
 
-<octal digit> ->
+<octal digit> ::=
     0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
 
-<octal digits> ->
+<octal digits> ::=
     <octal digit> | <octal digits> <octal digit>
 
 ```
 ### 2.7 Floating-point Literals
 ```
-<floating-point literal> ->
+<floating-point literal> ::=
     <decimal integer literal> . <opt_digits>
 ```
 ### 2.8 String Literals
 ```
-<string literal> ->
+<string literal> ::=
     "<opt_string characters>"
 
-<string chacters> ->
+<string chacters> ::=
     <input character> | <string characters> <input character>
 ```
 ### 2.9 Separators
 ```
-<separator> ->
+<separator> ::=
     ( | ) | { | } | , | ; | " |.
 ```
 ### 2.10 Operators
 ```
-<operator> ->
+<operator> ::=
     <arithmetic operator> | <string concatenation operator>
     | <relational operator> | <logical operator>
     | <assignment operator>
 
-<arithmetic operator> ->
+<arithmetic operator> ::=
     + | - | * | /
 
-<string concatenation operator> ->
+<string concatenation operator> ::=
     <<
 
-<relational operator> ->
+<relational operator> ::=
     > | < | == | <>
 
-<logical operator> ->
+<logical operator> ::=
     .AND. | .OR.
 
-<assignment operator> ->
+<assignment operator> ::=
     =
 ```
 ## 3. The PLATYPUS Syntactic Specification
 ### 3.1 PLATYPUS Program
 ```
-<program> ->
+<program> ::=
     PLATYPUS {<opt_statements>} SEOF
 
-<statements> ->
+<statements> ::=
     <statement> | <statements> <statement>
 ```
 ### 3.2 Statements
 ```
-<statement> ->
+<statement> ::=
     <assignment statement>
     | <selection statement>
     | <iteration statement>
@@ -156,59 +156,59 @@ This does not follow standard BNF/EBNF syntax, I will rewrite it once I get all
 ```
 ### 3.3 Assignment Statement
 ```
-<assignment statement> ->
+<assignment statement> ::=
     <assignment expression> ;
 
-<assignment expression> ->
+<assignment expression> ::=
     <arithmetic variable identifier> = <arithmetic expression>
     | <string variable identifier> = <string expression>
 ```
 #### 3.2.2 Selection Statement (`if` statement)
 ```
-<selection statement> ->
+<selection statement> ::=
     IF (<conditional expression>) THEN <opt_statements>
     ELSE {<opt_statements>};
 ```
 #### 3.2.3 Iteration Statement (the loop statement)
 ```
-<iteration statement> ->
+<iteration statement> ::=
     USING (<assignment expression> , <conditional expression>, <assignment expression>) REPEAT { <opt_statements> };
 ```
 #### 3.2.4 Input Statement
 ```
-<input statement> ->
+<input statement> ::=
     INPUT (<variable list>);
 
-<variable list> ->
+<variable list> ::=
     <variable identifier> | <variable list>,<variable identifier>
 ```
 #### 3.2.5 Output Statement
 ```
-<output statement> ->
+<output statement> ::=
     OUTPUT(<opt_variable list> | <opt_string literal>);
 ```
 ### 3.3 Expressions
 #### 3.3.1 Arithmetic Expressions
 ```
-<arithmetic expression> ->
+<arithmetic expression> ::=
     <unary arithmetic expression>
     | <additive arithmetic expression>
 
-<unary arithmetic expression> ->
+<unary arithmetic expression> ::=
     - <primary arithmetic expression>
     | + <primary arithmetic expression
 
-<additive arithmetic expression> ->
+<additive arithmetic expression> ::=
     <additive arithmetic expression> + <multiplicative arithmetic expression>
     | <additive arithmetic expression> - <multiplicative arithmetic expression>
     | <multiplicative arithmetic expression>
 
-<multiplicative arithmetic expression> ->
+<multiplicative arithmetic expression> ::=
     <multiplicative arithmetic expression> * <primary arithmetic expression>
     | <multiplicative arithmetic expression> / <primary arithmetic expression>
     | <primary arithmetic expression>
 
-<primary arithmetic expression> ->
+<primary arithmetic expression> ::=
     <variable identifier>
     | <floating-point literal>
     | <integer literal>
@@ -216,11 +216,11 @@ This does not follow standard BNF/EBNF syntax, I will rewrite it once I get all
 ```
 #### 3.3.2 String Expression
 ```
-<string expression> ->
+<string expression> ::=
     <primary string expression>
     | <string expression> << <primary string expression>
 
-<primary string expression> ->
+<primary string expression> ::=
     <string variable identifier>
     | <string literal>
 ```
@@ -228,30 +228,30 @@ This does not follow standard BNF/EBNF syntax, I will rewrite it once I get all
 ```
 // BNF from C specification adapted to PLATYPUS
 // source: https://cs.wmich.edu/~gupta/teaching/cs4850/sumII06/The%20syntax%20of%20C%20in%20Backus-Naur%20form.htm
-    <conditional expression> ->
+    <conditional expression> ::=
         <logical OR expression>
 
-    <logical OR expression> ->
+    <logical OR expression> ::=
         <logical AND expression>
         | <logical OR expression> .OR. <logical AND expression>
 
-    <logical AND expression> ->
+    <logical AND expression> ::=
         <relational expression>
         | <logical AND expression> .AND. <relational expression>
 // END BNF from C specification
 ```
 #### 3.3.4 Relational Expression
 ```
-<relational expression> ->
+<relational expression> ::=
     <primary a_relational expression> <relational operator> <primary a_relational expression>
     | <primary s_relational expression> <relational operator> <primary s_relational expression>
 
-<primary a_relational expression> ->
+<primary a_relational expression> ::=
     <floating-point literal>
     | <integer literal>
     | <variable identifier>
 
-<primary s_relational expression> ->
+<primary s_relational expression> ::=
     <string literal>
     | <string variable identifier>
 ```
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