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Fix indentation

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Victor Fernandes 2017-02-10 16:33:41 -05:00
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PLATYPUS Grammar Specification.md
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@ -6,247 +6,247 @@
### 2.1 Input Elements and Tokens ### 2.1 Input Elements and Tokens
``` ```
<input character> -> <input character> ->
ASCII characters but not SEOF ASCII characters but not SEOF
<input> -> <input> ->
<input elements> SEOF <input elements> SEOF
<input elements> -> <input elements> ->
<input element> | <input elements> <input element> <input element> | <input elements> <input element>
<token> -> <token> ->
<variable identifier> | <keyword> | <floating-point literal> <variable identifier> | <keyword> | <floating-point literal>
| <integer literal> | <string literal> | <separator> | <operator> | <integer literal> | <string literal> | <separator> | <operator>
``` ```
### 2.2 White Space ### 2.2 White Space
``` ```
<white space> -> <white space> ->
ASCII SP character (space) ASCII SP character (space)
| ASCII HT character (horizontal tab) | ASCII HT character (horizontal tab)
| ASCII VT character (vertical tab) | ASCII VT character (vertical tab)
| ASCII FF character (form feed) | ASCII FF character (form feed)
| <line terminator> | <line terminator>
<line terminator> -> <line terminator> ->
CR | LF | CR LF CR | LF | CR LF
``` ```
### 2.3 Comments ### 2.3 Comments
``` ```
<comment> -> <comment> ->
!< <opt_characters in line> <line terminator> !< <opt_characters in line> <line terminator>
<characters in line> -> <characters in line> ->
<comment character> | <characters in line> <comment character> <comment character> | <characters in line> <comment character>
<comment character> -> <comment character> ->
<input character> but not <line terminator> <input character> but not <line terminator>
``` ```
### 2.4 Variable Identifiers ### 2.4 Variable Identifiers
``` ```
<variable identifier> -> <variable identifier> ->
<arithmetic variable identifier> | <string variable identifier> <arithmetic variable identifier> | <string variable identifier>
<arithmetic identifier> -> <arithmetic identifier> ->
<letter> <opt_letters or digits> <letter> <opt_letters or digits>
<letters or digits> -> <letters or digits> ->
<letter or digit> | <letters or digits> <letter or digit> <letter or digit> | <letters or digits> <letter or digit>
<letter> -> one of
[a-z][A-Z]
<letter or digit> -> one of <letter> -> one of
[a-z][A-Z][0-9] [a-z][A-Z]
<string variable identifier> -> <letter or digit> -> one of
<arithmetic variable identifier># [a-z][A-Z][0-9]
<string variable identifier> ->
<arithmetic variable identifier>#
``` ```
### 2.5 Keywords ### 2.5 Keywords
``` ```
<keyword> -> <keyword> ->
PLATYPUS | IF | THEN | ELSE | USING | REPEAT | INPUT | OUTPUT PLATYPUS | IF | THEN | ELSE | USING | REPEAT | INPUT | OUTPUT
``` ```
### 2.6 Integer Literals ### 2.6 Integer Literals
``` ```
<integer literal> -> <integer literal> ->
<decimal integer literal> | <octal integer literal> <decimal integer literal> | <octal integer literal>
<decimal integer literal> ->
0 | <non-zero digit> <opt_digits>
<digits> -> <decimal integer literal> ->
<digit> | <digits> <digit> 0 | <non-zero digit> <opt_digits>
<digit> -> <digits> ->
0 | <non-zero digit> <digit> | <digits> <digit>
<non-zero digit> -> one of
[1-9]
<octal integer literal> -> <digit> ->
0 <octal digit> <octal digits> 0 | <non-zero digit>
<non-zero digit> -> one of
[1-9]
<octal integer literal> ->
0 <octal digit> <octal digits>
<octal digit> ->
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
<octal digits> ->
<octal digit> | <octal digits> <octal digit>
<octal digit> ->
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
<octal digits> ->
<octal digit> | <octal digits> <octal digit>
``` ```
### 2.7 Floating-point Literals ### 2.7 Floating-point Literals
``` ```
<floating-point literal> -> <floating-point literal> ->
<decimal integer literal> . <opt_digits> <decimal integer literal> . <opt_digits>
``` ```
### 2.8 String Literals ### 2.8 String Literals
``` ```
<string literal> -> <string literal> ->
"<opt_string characters>" "<opt_string characters>"
<string chacters> -> <string chacters> ->
<input character> | <string characters> <input character> <input character> | <string characters> <input character>
``` ```
### 2.9 Separators ### 2.9 Separators
``` ```
<separator> -> one of <separator> -> one of
( ) { } , ; " . ( ) { } , ; " .
``` ```
### 2.10 Operators ### 2.10 Operators
``` ```
<operator> -> <operator> ->
<arithmetic operator> | <string concatenation operator> <arithmetic operator> | <string concatenation operator>
| <relational operator> | <logical operator> | <relational operator> | <logical operator>
| <assignment operator> | <assignment operator>
<arithmetic operator> -> one of
+ - * /
<string concatenation operator> -> one of
> < == <>
<logical operator> -> <arithmetic operator> -> one of
.AND. | .OR. + - * /
<assignment operator> -> <string concatenation operator> -> one of
= > < == <>
<logical operator> ->
.AND. | .OR.
<assignment operator> ->
=
``` ```
## 3. The PLATYPUS Syntatic Specification ## 3. The PLATYPUS Syntatic Specification
### 3.1 PLATYPUS Program ### 3.1 PLATYPUS Program
``` ```
<program> -> <program> ->
PLATYPUS {<opt_statements>} SEOF PLATYPUS {<opt_statements>} SEOF
<statements> -> <statements> ->
<statement> | <statements> <statement> <statement> | <statements> <statement>
``` ```
### 3.2 Statements ### 3.2 Statements
``` ```
<statement> -> <statement> ->
<assignment statement> <assignment statement>
| <selection statement> | <selection statement>
| <iteration statement> | <iteration statement>
| <input statement> | <input statement>
| <output statement> | <output statement>
``` ```
### 3.3 Assignment Statement ### 3.3 Assignment Statement
``` ```
<assignment statement> -> <assignment statement> ->
<assignment expression> <assignment expression>
<assignment expression> -> <assignment expression> ->
AVID = <arithmetic expression> AVID = <arithmetic expression>
| SVID = <string expression> | SVID = <string expression>
``` ```
#### 3.2.2 Selection Statement (`if` statement) #### 3.2.2 Selection Statement (`if` statement)
``` ```
<selection statement> -> <selection statement> ->
IF (<conditional expression>) THEN <statements> IF (<conditional expression>) THEN <statements>
ELSE {<opt_statements>}; ELSE {<opt_statements>};
``` ```
#### 3.2.3 Iteration Statement (the loop statement) #### 3.2.3 Iteration Statement (the loop statement)
``` ```
<iteration statement> -> <iteration statement> ->
<TBC> <TBC>
``` ```
#### 3.2.4 Input Statement #### 3.2.4 Input Statement
``` ```
<input statement> -> <input statement> ->
INPUT (<variable list>); INPUT (<variable list>);
<variable list> -> <variable list> ->
<variable identifier> | <variable list>,<variable identifier> <variable identifier> | <variable list>,<variable identifier>
``` ```
#### 3.2.5 Output Statement #### 3.2.5 Output Statement
``` ```
<output statement> -> <output statement> ->
<TBC> <TBC>
``` ```
### 3.3 Expressions ### 3.3 Expressions
#### 3.3.1 Arithmetic Expressions #### 3.3.1 Arithmetic Expressions
``` ```
<arithmetic expression> -> <arithmetic expression> ->
<unary arithmetic expression> <unary arithmetic expression>
| <additive arithmetic expression> | <additive arithmetic expression>
<unary arithmetic expression> -> <unary arithmetic expression> ->
- <primary arithmetic expression> - <primary 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>
| <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> -> <multiplicative arithmetic expression> ->
<variable identifier> <multiplicative arithmetic expression> * <primary arithmetic expression>
| <floating-point literal> | <multiplicative arithmetic expression> / <primary arithmetic expression>
| <integer literal> | <primary arithmetic expression>
| (<arithmetic expression>)
<primary arithmetic expression> ->
<variable identifier>
| <floating-point literal>
| <integer literal>
| (<arithmetic expression>)
``` ```
#### 3.3.2 String Expression #### 3.3.2 String Expression
``` ```
<string expression> -> <string expression> ->
<primary string expression> <primary string expression>
| <string expression> << <primary string expression> | <string expression> << <primary string expression>
<primary string expression> -> <primary string expression> ->
<string variable identifier> <string variable identifier>
| <string literal> | <string literal>
``` ```
#### 3.3.3 Conditional Expression #### 3.3.3 Conditional Expression
``` ```
<conditional expression> -> <conditional expression> ->
<logical OR expression> <logical OR expression>
<logical OR expression> -> <logical OR expression> ->
<TBC> <TBC>
<logical AND expression> -> <logical AND expression> ->
<TBC> <TBC>
``` ```
#### 3.3.4 Relational Expression #### 3.3.4 Relational Expression
``` ```
<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 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 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> ->
<floating-point literal>
| <integer literal>
| <variable identifier>
<primary s_relational expression> -> <primary a_relational expression> ->
<TBC> <floating-point literal>
| <integer literal>
| <variable identifier>
<primary s_relational expression> ->
<TBC>
``` ```