Merge branch 'master' of git.xeserv.us:victorvalenca/platypus
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# Set default behavior to automatically normalize line endings.
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* text=auto
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# Note: This is only used by command line
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#*.cs diff=csharp
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# Set the merge driver for project and solution files
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#
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# Merging from the command prompt will add diff markers to the files if there
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# are conflicts (Merging from VS is not affected by the settings below, in VS
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# the diff markers are never inserted). Diff markers may cause the following
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# file extensions to fail to load in VS. An alternative would be to treat
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# these files as binary and thus will always conflict and require user
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# intervention with every merge. To do so, just uncomment the entries below
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#*.sln merge=binary
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#*.csproj merge=binary
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#*.vcxproj merge=binary
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#*.vcproj merge=binary
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#*.dbproj merge=binary
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#*.fsproj merge=binary
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#*.wixproj merge=binary
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# is only available from the command line. Turn it on by uncommenting the
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# entries below.
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###############################################################################
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#*.doc diff=astextplain
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#*.DOC diff=astextplain
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#*.docx diff=astextplain
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#*.DOCX diff=astextplain
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#*.dot diff=astextplain
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#*.DOT diff=astextplain
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#*.pdf diff=astextplain
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#*.PDF diff=astextplain
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#*.RTF diff=astextplain
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@ -2,147 +2,152 @@
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## 2. Lexical Specification (INCOMPLETE)
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## 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**
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## NOTE:
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**This is incomplete, I am simply writing this down and will fix it as I read along the informal language specification provided to me
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This does not follow standard BNF/EBNF syntax, I will rewrite it once I get all the definitions correct and complete.**
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### 2.1 Input Elements and Tokens
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```
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<input character> ->
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``` bnf
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<input character> ::=
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ASCII characters but not SEOF
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<input> ->
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<input> ::=
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<input elements> SEOF
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<input elements> ->
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<input elements> ::=
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<input element> | <input elements> <input element>
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<token> ->
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<token> ::=
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<variable identifier> | <keyword> | <floating-point literal>
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| <integer literal> | <string literal> | <separator> | <operator>
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```
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### 2.2 White Space
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```
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<white space> ->
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<white space> ::=
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ASCII SP character (space)
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| ASCII HT character (horizontal tab)
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| ASCII VT character (vertical tab)
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| ASCII FF character (form feed)
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| <line terminator>
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<line terminator> ->
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<line terminator> ::=
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CR | LF | CR LF
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```
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### 2.3 Comments
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```
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<comment> ->
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<comment> ::=
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!< <opt_characters in line> <line terminator>
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<characters in line> ->
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<characters in line> ::=
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<comment character> | <characters in line> <comment character>
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<comment character> ->
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<comment character> ::=
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<input character> but not <line terminator>
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```
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### 2.4 Variable Identifiers
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```
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<variable identifier> ->
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<variable identifier> ::=
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<arithmetic variable identifier> | <string variable identifier>
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<arithmetic identifier> ->
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<arithmetic identifier> ::=
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<letter> <opt_letters or digits>
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<letters or digits> ->
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<letters or digits> ::=
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<letter or digit> | <letters or digits> <letter or digit>
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<letter> -> one of
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<letter> ::= one of
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[a-z][A-Z]
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<letter or digit> -> one of
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<letter or digit> ::= one of
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[a-z][A-Z][0-9]
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<string variable identifier> ->
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<string variable identifier> ::=
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<arithmetic variable identifier>#
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```
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### 2.5 Keywords
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```
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<keyword> ->
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<keyword> ::=
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PLATYPUS | IF | THEN | ELSE | USING | REPEAT | INPUT | OUTPUT
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```
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### 2.6 Integer Literals
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```
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<integer literal> ->
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<integer literal> ::=
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<decimal integer literal> | <octal integer literal>
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<decimal integer literal> ->
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<decimal integer literal> ::=
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0 | <non-zero digit> <opt_digits>
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<digits> ->
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<digits> ::=
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<digit> | <digits> <digit>
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<digit> ->
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<digit> ::=
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0 | <non-zero digit>
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<non-zero digit> -> one of
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[1-9]
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<non-zero digit> ::= one of
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1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
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<octal integer literal> ->
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<octal integer literal> ::=
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0 <octal digit> <octal digits>
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<octal digit> ->
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<octal digit> ::=
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0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
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<octal digits> ->
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<octal digits> ::=
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<octal digit> | <octal digits> <octal digit>
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```
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### 2.7 Floating-point Literals
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```
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<floating-point literal> ->
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<floating-point literal> ::=
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<decimal integer literal> . <opt_digits>
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```
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### 2.8 String Literals
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```
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<string literal> ->
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<string literal> ::=
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"<opt_string characters>"
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<string chacters> ->
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<string chacters> ::=
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<input character> | <string characters> <input character>
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```
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### 2.9 Separators
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```
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<separator> -> one of
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( ) { } , ; " .
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<separator> ::=
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( | ) | { | } | , | ; | " |.
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```
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### 2.10 Operators
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```
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<operator> ->
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<operator> ::=
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<arithmetic operator> | <string concatenation operator>
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| <relational operator> | <logical operator>
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| <assignment operator>
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<arithmetic operator> -> one of
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+ - * /
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<arithmetic operator> ::=
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+ | - | * | /
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<string concatenation operator> -> one of
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> < == <>
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<string concatenation operator> ::=
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<<
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<logical operator> ->
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<relational operator> ::=
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> | < | == | <>
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<logical operator> ::=
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.AND. | .OR.
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<assignment operator> ->
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<assignment operator> ::=
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=
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```
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## 3. The PLATYPUS Syntatic Specification
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## 3. The PLATYPUS Syntactic Specification
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### 3.1 PLATYPUS Program
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```
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<program> ->
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<program> ::=
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PLATYPUS {<opt_statements>} SEOF
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<statements> ->
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<statements> ::=
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<statement> | <statements> <statement>
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```
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### 3.2 Statements
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```
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<statement> ->
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<statement> ::=
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<assignment statement>
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| <selection statement>
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| <iteration statement>
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@ -151,59 +156,59 @@
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```
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### 3.3 Assignment Statement
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```
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<assignment statement> ->
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<assignment expression>
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<assignment statement> ::=
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<assignment expression> ;
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<assignment expression> ->
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AVID = <arithmetic expression>
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| SVID = <string expression>
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<assignment expression> ::=
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<arithmetic variable identifier> = <arithmetic expression>
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| <string variable identifier> = <string expression>
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```
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#### 3.2.2 Selection Statement (`if` statement)
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```
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<selection statement> ->
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IF (<conditional expression>) THEN <statements>
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<selection statement> ::=
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IF (<conditional expression>) THEN <opt_statements>
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ELSE {<opt_statements>};
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```
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#### 3.2.3 Iteration Statement (the loop statement)
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```
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<iteration statement> ->
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<TBC>
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<iteration statement> ::=
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USING (<assignment expression> , <conditional expression>, <assignment expression>) REPEAT { <opt_statements> };
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```
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#### 3.2.4 Input Statement
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```
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<input statement> ->
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<input statement> ::=
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INPUT (<variable list>);
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<variable list> ->
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<variable list> ::=
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<variable identifier> | <variable list>,<variable identifier>
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```
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#### 3.2.5 Output Statement
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```
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<output statement> ->
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<TBC>
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<output statement> ::=
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OUTPUT(<opt_variable list> | <opt_string literal>);
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```
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### 3.3 Expressions
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#### 3.3.1 Arithmetic Expressions
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```
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<arithmetic expression> ->
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<arithmetic expression> ::=
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<unary arithmetic expression>
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| <additive arithmetic expression>
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<unary arithmetic expression> ->
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<unary arithmetic expression> ::=
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- <primary arithmetic expression>
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| + <primary arithmetic expression
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<additive arithmetic expression> ->
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<additive arithmetic expression> ::=
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<additive arithmetic expression> + <multiplicative arithmetic expression>
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| <additive arithmetic expression> - <multiplicative arithmetic expression>
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| <multiplicative arithmetic expression>
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<multiplicative arithmetic expression> ->
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<multiplicative arithmetic expression> ::=
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<multiplicative arithmetic expression> * <primary arithmetic expression>
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| <multiplicative arithmetic expression> / <primary arithmetic expression>
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| <primary arithmetic expression>
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<primary arithmetic expression> ->
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<primary arithmetic expression> ::=
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<variable identifier>
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| <floating-point literal>
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| <integer literal>
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@ -211,42 +216,42 @@
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```
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#### 3.3.2 String Expression
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```
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<string expression> ->
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<string expression> ::=
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<primary string expression>
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| <string expression> << <primary string expression>
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<primary string expression> ->
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<primary string expression> ::=
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<string variable identifier>
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| <string literal>
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```
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#### 3.3.3 Conditional Expression
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```
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<conditional expression> ->
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<logical OR expression>
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// BNF from C specification adapted to PLATYPUS
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// source: https://cs.wmich.edu/~gupta/teaching/cs4850/sumII06/The%20syntax%20of%20C%20in%20Backus-Naur%20form.htm
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<conditional expression> ::=
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<logical OR expression>
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<logical OR expression> ->
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<TBC>
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<logical OR expression> ::=
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<logical AND expression>
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| <logical OR expression> .OR. <logical AND expression>
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<logical AND expression> ->
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<TBC>
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<logical AND expression> ::=
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<relational expression>
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| <logical AND expression> .AND. <relational expression>
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// END BNF from C specification
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```
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#### 3.3.4 Relational Expression
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```
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<relational expression> ->
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<primary a_relational expression> == <primary a_relational expression>
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| <primary a_relational expression> <= <primary a_relational expression>
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| <primary a_relational expression> > <primary a_relational expression>
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| <primary a_relational expression> < <primary a_relational expression>
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| <primary s_relational expression> == <primary s_relational expression>
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| <primary s_relational expression> <= <primary s_relational expression>
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| <primary s_relational expression> > <primary s_relational expression>
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| <primary s_relational expression> < <primary s_relational expression>
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<relational expression> ::=
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<primary a_relational expression> <relational operator> <primary a_relational expression>
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| <primary s_relational expression> <relational operator> <primary s_relational expression>
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<primary a_relational expression> ->
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<primary a_relational expression> ::=
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<floating-point literal>
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| <integer literal>
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| <variable identifier>
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<primary s_relational expression> ->
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<TBC>
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<primary s_relational expression> ::=
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<string literal>
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| <string variable identifier>
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```
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@ -0,0 +1,28 @@
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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 14
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||||
VisualStudioVersion = 14.0.25420.1
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "buffer", "buffer\buffer.vcxproj", "{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}"
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EndProject
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Global
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||||
GlobalSection(SolutionConfigurationPlatforms) = preSolution
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||||
Debug|x64 = Debug|x64
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||||
Debug|x86 = Debug|x86
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||||
Release|x64 = Release|x64
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||||
Release|x86 = Release|x86
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||||
EndGlobalSection
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||||
GlobalSection(ProjectConfigurationPlatforms) = postSolution
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||||
{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Debug|x64.ActiveCfg = Debug|x64
|
||||
{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Debug|x64.Build.0 = Debug|x64
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||||
{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
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||||
{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Release|x86.ActiveCfg = Release|Win32
|
||||
{034E0E4B-DAFA-45D4-882B-1815AC73DA9E}.Release|x86.Build.0 = Release|Win32
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||||
EndGlobalSection
|
||||
GlobalSection(SolutionProperties) = preSolution
|
||||
HideSolutionNode = FALSE
|
||||
EndGlobalSection
|
||||
EndGlobal
|
||||
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Reference in New Issue