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Minor fixes for arrow like change patch

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Don't use ^ operator yet for compatibility with older compilers.
Moved arrow like explanation, and fix precedence description on the text in the manual.
Fixed typo in news.
This commit is contained in:
ReneSac
2015-04-11 17:22:09 -03:00
parent 34997292f4
commit 06617bbb76
3 changed files with 7 additions and 6 deletions
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4
compiler/parser.nim
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@@ -212,8 +212,8 @@ proc getPrecedence(tok: TToken, strongSpaces: bool): int =
let relevantChar = tok.ident.s[0]
# arrow like?
if L > 1 and tok.ident.s[^1] == '>' and tok.ident.s[^2] in {'-', '~', '='}:
return considerStrongSpaces(1)
if L > 1 and tok.ident.s[L-1] == '>' and
tok.ident.s[L-2] in {'-', '~', '='}: return considerStrongSpaces(1)
template considerAsgn(value: expr) =
result = if tok.ident.s[L-1] == '=': 1 else: value

7
doc/manual/syntax.txt
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@@ -15,8 +15,6 @@ Associativity
Binary operators whose first character is ``^`` are right-associative, all
other binary operators are left-associative.
Operators ending in either ``->``, ``~>`` or ``=>`` are called
`arrow like`:idx:.
Precedence
@@ -33,9 +31,12 @@ as ``(@x).abc`` whereas ``$x.abc`` is parsed as ``$(x.abc)``.
For binary operators that are not keywords the precedence is determined by the
following rules:
Operators ending in either ``->``, ``~>`` or ``=>`` are called
`arrow like`:idx:, and have the lowest precedence of all operators.
If the operator ends with ``=`` and its first character is none of
``<``, ``>``, ``!``, ``=``, ``~``, ``?``, it is an *assignment operator* which
has the lowest precedence.
has the second lowest precedence.
Otherwise precedence is determined by the first character.

2
web/news.txt
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@@ -34,7 +34,7 @@ News
should be used instead.
- ``nim idetools`` has been replaced by a separate tool `nimsuggest`_.
- *arrow like* operators are not right associative anymore.
- *arrow like* operators are now required end with either ``->``, ``~>`` or
- *arrow like* operators are now required to end with either ``->``, ``~>`` or
``=>``, not just ``>``. Examples of operators still considered arrow like:
``->``, ``==>``, ``+=>``. On the other hand, the following operators are now
considered regular operators again: ``|>``, ``-+>``, etc.