diff options
Diffstat (limited to 'runtime/doc/eval.txt')
| -rw-r--r-- | runtime/doc/eval.txt | 57 |
1 files changed, 54 insertions, 3 deletions
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt index 351690f4df..1ff6e3c360 100644 --- a/runtime/doc/eval.txt +++ b/runtime/doc/eval.txt @@ -1407,6 +1407,34 @@ to be doubled. These two commands are equivalent: > ------------------------------------------------------------------------------ +interpolated-string *$quote* *interpolated-string* + +$"string" interpolated string constant *expr-$quote* +$'string' interpolated literal string constant *expr-$'* + +Interpolated strings are an extension of the |string| and |literal-string|, +allowing the inclusion of Vim script expressions (see |expr1|). Any +expression returning a value can be enclosed between curly braces. The value +is converted to a string. All the text and results of the expressions +are concatenated to make a new string. + *E1278* +To include an opening brace '{' or closing brace '}' in the string content +double it. For double quoted strings using a backslash also works. A single +closing brace '}' will result in an error. + +Examples: > + let your_name = input("What's your name? ") +< What's your name? Peter ~ +> + echo + echo $"Hello, {your_name}!" +< Hello, Peter! ~ +> + echo $"The square root of {{9}} is {sqrt(9)}" +< The square root of {9} is 3.0 ~ + + +------------------------------------------------------------------------------ option *expr-option* *E112* *E113* &option option value, local value if possible @@ -2540,14 +2568,30 @@ This does NOT work: > *:let=<<* *:let-heredoc* *E990* *E991* *E172* *E221* *E1145* -:let {var-name} =<< [trim] {endmarker} +:let {var-name} =<< [trim] [eval] {endmarker} text... text... {endmarker} Set internal variable {var-name} to a |List| containing the lines of text bounded by the string - {endmarker}. The lines of text is used as a - |literal-string|. + {endmarker}. + + If "eval" is not specified, then each line of text is + used as a |literal-string|, except that single quotes + does not need to be doubled. + If "eval" is specified, then any Vim expression in the + form {expr} is evaluated and the result replaces the + expression, like with |interpolated-string|. + Example where $HOME is expanded: > + let lines =<< trim eval END + some text + See the file {$HOME}/.vimrc + more text + END +< There can be multiple Vim expressions in a single line + but an expression cannot span multiple lines. If any + expression evaluation fails, then the assignment fails. + {endmarker} must not contain white space. {endmarker} cannot start with a lower case character. The last line should end only with the {endmarker} @@ -2597,6 +2641,13 @@ text... 1 2 3 4 5 6 7 8 DATA + + let code =<< trim eval CODE + let v = {10 + 20} + let h = "{$HOME}" + let s = "{Str1()} abc {Str2()}" + let n = {MyFunc(3, 4)} + CODE < *E121* :let {var-name} .. List the value of variable {var-name}. Multiple |