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CS 3723 Programming Languages |
Colorful Tiny® Syntax | |
- Metasymbols [ ] enclose an optional item
- Metasymbols { } mean "zero or more occurrences of" the item enclosed.
- The above items are confusing because the characters [ ] { } also serve as terminal symbols in the if-then-else and the while statements.
- Colors are used as follows:
- red = terminal symbol,
- green = non-terminal symbol,
- black = metasymbol.
| Colorful Grammar for Tiny® language |
|---|
M −−−> S { S } '$'
S −−−> I | W | A | P | G
I −−−> '[' E '?' S { S } ':' S { S } ']' | '[' E '?' S { S } ']'
W −−−> '{' E '?' S { S } '}'
A −−−> lower-case '=' E ';'
P −−−> '<' ( E ';' | upper-case ';' )
G −−−> '>' lower-case ';'
E −−−> T {('+' | '-') T}
T −−−> U {('*' | '/' | '%' | '@') U}
U −−−> F '^' U | F
F −−−> ('+' | '-') ( '(' E ')' | lower-case | digit )
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| Colorful Grammar for Tiny® language, no quote marks |
|---|
M −−−> S { S } $
S −−−> I | W | A | P | G
I −−−> [ E ? S { S } : S { S } ] | [ E ? S { S } ]
W −−−> { E ? S { S } }
A −−−> lower-case = E ;
P −−−> < ( E ; | upper-case ; )
G −−−> > lower-case ;
E −−−> T {(+ | -) T}
T −−−> U {(* | / | % | @) U}
U −−−> F ^ U | F
F −−−> (+ | -) ( ( E ) | lower-case | digit )
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