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- removed fall-through for case: case: in switch statements

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- added ()'s to all print calls in examples
- augmented rule about use of identifiers

R=r
DELTA=11  (0 added, 1 deleted, 10 changed)
OCL=14097
CL=14097
This commit is contained in:
Robert Griesemer 2008-08-11 18:09:31 -07:00
parent 968701beb1
commit fe582137f4
1 changed files with 9 additions and 10 deletions
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19
doc/go_lang.txt
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@ -4,7 +4,7 @@ The Go Programming Language (DRAFT)
Robert Griesemer, Rob Pike, Ken Thompson Robert Griesemer, Rob Pike, Ken Thompson
---- ----
(August 7, 2008) (August 11, 2008)
This document is a semi-formal specification/proposal for a new This document is a semi-formal specification/proposal for a new
systems programming language. The document is under active systems programming language. The document is under active
@ -321,8 +321,8 @@ Reserved words
else if range var else if range var
export import export import
With the exception of structure fields and methods, reserved words may
TODO: "len" is currently also a reserved word - it shouldn't be. not be declared as identifiers.
Types Types
@ -1357,9 +1357,9 @@ pointer or interface value.
var p *int; var p *int;
if p != nil { if p != nil {
print p print(p)
} else { } else {
print "p points nowhere" print("p points nowhere")
} }
By default, pointers are initialized to nil. By default, pointers are initialized to nil.
@ -1735,9 +1735,9 @@ The value of the boolean reports true if the communication succeeded,
false if it did not. These two examples are equivalent: false if it did not. These two examples are equivalent:
ok := ch -< 3; ok := ch -< 3;
if ok { print "sent" } else { print "not sent" } if ok { print("sent") } else { print("not sent") }
if ch -< 3 { print "sent" } else { print "not sent" } if ch -< 3 { print("sent") } else { print("not sent") }
In other words, if the program tests the value of a send operation, In other words, if the program tests the value of a send operation,
the send is non-blocking and the value of the expression is the the send is non-blocking and the value of the expression is the
@ -1753,7 +1753,7 @@ As with send operations, in expression context this form may
be used as a boolean and makes the receive non-blocking: be used as a boolean and makes the receive non-blocking:
ok := e <- ch; ok := e <- ch;
if ok { print "received", e } else { print "did not receive" } if ok { print("received", e) } else { print("did not receive") }
The receive operator may also be used as a prefix unary operator The receive operator may also be used as a prefix unary operator
on a channel. on a channel.
@ -1873,8 +1873,7 @@ Switch statements
Switches provide multi-way execution. Switches provide multi-way execution.
SwitchStat = "switch" [ [ Simplestat ] ";" ] [ Expression ] "{" { CaseClause } "}" . SwitchStat = "switch" [ [ Simplestat ] ";" ] [ Expression ] "{" { CaseClause } "}" .
CaseClause = CaseList [ StatementList [ ";" ] ] [ "fallthrough" [ ";" ] ] . CaseClause = Case [ StatementList [ ";" ] ] [ "fallthrough" [ ";" ] ] .
CaseList = Case { Case } .
Case = ( "case" ExpressionList | "default" ) ":" . Case = ( "case" ExpressionList | "default" ) ":" .
There can be at most one default case in a switch statement. There can be at most one default case in a switch statement.