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patch 8.1.1114: confusing overloaded operator "." for string concatenation

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Problem:    Confusing overloaded operator "." for string concatenation.
Solution:   Add ".." for string concatenation.  Also "let a ..= b".
This commit is contained in:
Bram Moolenaar
2019-04-04 15:36:05 +02:00
parent eb93f3f0e2
commit 0f248b006c
4 changed files with 59 additions and 15 deletions
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31
runtime/doc/eval.txt
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@@ -786,10 +786,10 @@ Expression syntax summary, from least to most significant:
expr2 ? expr1 : expr1 if-then-else
|expr2| expr3
expr3 || expr3 .. logical OR
expr3 || expr3 ... logical OR
|expr3| expr4
expr4 && expr4 .. logical AND
expr4 && expr4 ... logical AND
|expr4| expr5
expr5 == expr5 equal
@@ -811,14 +811,15 @@ Expression syntax summary, from least to most significant:
instance
|expr5| expr6
expr6 + expr6 .. number addition, list or blob concatenation
expr6 - expr6 .. number subtraction
expr6 . expr6 .. string concatenation
expr6 + expr6 ... number addition, list or blob concatenation
expr6 - expr6 ... number subtraction
expr6 . expr6 ... string concatenation
expr6 .. expr6 ... string concatenation
|expr6| expr7
expr7 * expr7 .. number multiplication
expr7 / expr7 .. number division
expr7 % expr7 .. number modulo
expr7 * expr7 ... number multiplication
expr7 / expr7 ... number division
expr7 % expr7 ... number modulo
|expr7| expr8
! expr7 logical NOT
@@ -847,7 +848,7 @@ Expression syntax summary, from least to most significant:
{args -> expr1} lambda expression
".." indicates that the operations in this level can be concatenated.
"..." indicates that the operations in this level can be concatenated.
Example: >
&nu || &list && &shell == "csh"
@@ -1026,13 +1027,17 @@ can be matched like an ordinary character. Examples:
expr5 and expr6 *expr5* *expr6*
---------------
expr6 + expr6 Number addition, |List| or |Blob| concatenation *expr-+*
expr6 - expr6 Number subtraction *expr--*
expr6 . expr6 String concatenation *expr-.*
expr6 + expr6 Number addition, |List| or |Blob| concatenation *expr-+*
expr6 - expr6 Number subtraction *expr--*
expr6 . expr6 String concatenation *expr-.*
expr6 .. expr6 String concatenation *expr-..*
For |Lists| only "+" is possible and then both expr6 must be a list. The
result is a new list with the two lists Concatenated.
For String concatenation ".." is preferred, since "." is ambiguous, it is also
used for |Dict| member access and floating point numbers.
expr7 * expr7 Number multiplication *expr-star*
expr7 / expr7 Number division *expr-/*
expr7 % expr7 Number modulo *expr-%*
@@ -5800,7 +5805,7 @@ islocked({expr}) *islocked()* *E786*
isnan({expr}) *isnan()*
Return |TRUE| if {expr} is a float with value NaN. >
echo isnan(0.0 / 0.0)
< 1 ~
< 1
{only available when compiled with the |+float| feature}