mirrors/Nim
1
0
Fork 0
mirror of https://github.com/nim-lang/Nim.git synced 2026-04-20 06:20:38 +00:00
Code Issues Packages Projects Releases Wiki Activity

Fix doc for #2523, regarding numeric literals.

Browse Source
This commit is contained in:
Oscar Campbell
2015-05-31 03:59:31 +02:00
parent 6820b2fea9
commit 9fcd5252c7
1 changed files with 14 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
doc/manual/lexing.txt
View File

@@ -276,7 +276,7 @@ Numerical constants are of a single type and have the form::
bindigit = '0'..'1'
HEX_LIT = '0' ('x' | 'X' ) hexdigit ( ['_'] hexdigit )*
DEC_LIT = digit ( ['_'] digit )*
OCT_LIT = '0o' octdigit ( ['_'] octdigit )*
OCT_LIT = '0' ('o' | 'c' | 'C') octdigit ( ['_'] octdigit )*
BIN_LIT = '0' ('b' | 'B' ) bindigit ( ['_'] bindigit )*
INT_LIT = HEX_LIT
@@ -297,15 +297,17 @@ Numerical constants are of a single type and have the form::
exponent = ('e' | 'E' ) ['+' | '-'] digit ( ['_'] digit )*
FLOAT_LIT = digit (['_'] digit)* (('.' (['_'] digit)* [exponent]) |exponent)
FLOAT32_LIT = HEX_LIT '\'' ('f'|'F') '32'
| (FLOAT_LIT | DEC_LIT | OCT_LIT | BIN_LIT) ['\''] ('f'|'F') '32'
FLOAT64_LIT = HEX_LIT '\'' ('f'|'F') '64'
| (FLOAT_LIT | DEC_LIT | OCT_LIT | BIN_LIT) ['\''] ('f'|'F') '64'
FLOAT32_SUFFIX = ('f' | 'F') ['32']
FLOAT32_LIT = HEX_LIT '\'' FLOAT32_SUFFIX
| (FLOAT_LIT | DEC_LIT | OCT_LIT | BIN_LIT) ['\''] FLOAT32_SUFFIX
FLOAT64_SUFFIX = ( ('f' | 'F') '64' ) | 'd' | 'D'
FLOAT64_LIT = HEX_LIT '\'' FLOAT64_SUFFIX
| (FLOAT_LIT | DEC_LIT | OCT_LIT | BIN_LIT) ['\''] FLOAT64_SUFFIX
As can be seen in the productions, numerical constants can contain underscores
for readability. Integer and floating point literals may be given in decimal (no
prefix), binary (prefix ``0b``), octal (prefix ``0o``) and hexadecimal
prefix), binary (prefix ``0b``), octal (prefix ``0o`` or ``0c``) and hexadecimal
(prefix ``0x``) notation.
There exists a literal for each numerical type that is
@@ -331,8 +333,11 @@ The type suffixes are:
``'u16`` uint16
``'u32`` uint32
``'u64`` uint64
``'f`` float32
``'d`` float64
``'f32`` float32
``'f64`` float64
``'f128`` float128
================= =========================
Floating point literals may also be in binary, octal or hexadecimal
@@ -344,8 +349,8 @@ is approximately 1.72826e35 according to the IEEE floating point standard.
Operators
---------
In Nim one can define his own operators. An operator is any
combination of the following characters::
Nim allows user defined operators. An operator is any combination of the
following characters::
= + - * / < >
@ $ ~ & % |
@@ -355,7 +360,7 @@ These keywords are also operators:
``and or not xor shl shr div mod in notin is isnot of``.
`=`:tok:, `:`:tok:, `::`:tok: are not available as general operators; they
are used for other notational purposes.
are used for other notational purposes.
``*:`` is as a special case the two tokens `*`:tok: and `:`:tok:
(to support ``var v*: T``).