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fix up grammar for optional elements in if and switch conditions

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SVN=122915
This commit is contained in:
Rob Pike 2008-06-16 12:02:27 -07:00
parent 39b28df01e
commit daebf91d2c
1 changed files with 4 additions and 5 deletions
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9
doc/go_lang.txt
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@ -1582,10 +1582,10 @@ If statements
If statements have the traditional form except that the
condition need not be parenthesized and the "then" statement
must be in brace brackets. The condition may be omitted in which
must be in brace brackets. The condition may be omitted, in which
case it is assumed to have the value "true".
IfStat = "if" [ [ SimpleStat ";" ] Expression ] Block [ "else" Statement ] .
IfStat = "if" [ [ Simplestat ] ";" ] [ Condition ] Block [ "else" Statement ] .
if x > 0 {
return true;
@ -1593,8 +1593,7 @@ case it is assumed to have the value "true".
An "if" statement may include the declaration of a single temporary variable.
The scope of the declared variable extends to the end of the if statement, and
the variable is initialized once before the statement is entered. If a variable
is declared, the condition cannot be omitted.
the variable is initialized once before the statement is entered.
if x := f(); x < y {
return x;
@ -1610,7 +1609,7 @@ Switch statements
Switches provide multi-way execution.
SwitchStat = "switch" [ [ SimpleStat ";" ] Expression ] "{" { CaseClause } "}" .
SwitchStat = "switch" [ [ Simplestat ] ";" ] [ Expression ] "{" { CaseClause } "}" .
CaseClause = CaseList StatementList [ ";" ] [ "fallthrough" [ ";" ] ] .
CaseList = Case { Case } .
Case = ( "case" ExpressionList | "default" ) ":" .