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Add float literal's grammar #109

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Sep 23, 2017
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Add float literal's grammar #109

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16 changes: 16 additions & 0 deletions src/tokens.md
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Expand Up @@ -264,6 +264,22 @@ a single integer literal.

#### Floating-point literals

> **<sup>Lexer</sup>**
> FLOAT_LITERAL :
> &nbsp;&nbsp; &nbsp;&nbsp; DEC_LITERAL `.`
> _(not immediately followed by `.`, `_` or an identifier_)
> &nbsp;&nbsp; | DEC_LITERAL FLOAT_EXPONENT
> &nbsp;&nbsp; | DEC_LITERAL `.` DEC_LITERAL FLOAT_EXPONENT<sup>?</sup>
> &nbsp;&nbsp; | DEC_LITERAL (`.` DEC_LITERAL)<sup>?</sup>
> FLOAT_EXPONENT<sup>?</sup> FLOAT_SUFFIX
>
> FLOAT_EXPONENT :
> &nbsp;&nbsp; (`e`|`E`) (`+`|`-`)?
> (DEC_DIGIT|`_`)<sup>\*</sup> DEC_DIGIT (DEC_DIGIT|`_`)<sup>\*</sup>
>
> FLOAT_SUFFIX :
> &nbsp;&nbsp; `f32` | `f64`

A _floating-point literal_ has one of two forms:

* A _decimal literal_ followed by a period character `U+002E` (`.`). This is
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