> On Sep 17, 2016, at 8:28 AM, Adrian Dușa <dusa.adr...@unibuc.ro> wrote:
>
> There is one minor problem with parse(): if any of the individual commands
> has an error, the entire text will be parsed in a single error.
>
> For example, in a normal R console:
>
>> print(2); ls(
> [1] 2
> +
>
> So first print(2) is executed, and only after the console expects the user
> to continue the command from ls(
> Parsing the same text:
>
>> parse(text = "print(2); ls(")
> Error in parse(text = "print(2); ls(") :
> <text>:2:0: unexpected end of input
> 1: print(2); ls(
> ^
>
> What I would need is something to separate the two commands, irrespective
> of their syntactical correctness:
>
> [1] "print(2)" "ls("
>
> I hope this explains the situation,
Not entirely clear. If you were intending to just get character output then you
could just use:
strsplit(txt, ";")
If you wanted parsing to an R expression to occur you could pass through sapply
and get a full accounting of the syntactic deficit using `try`:
sapply(strsplit( "print(2); ls(" , ";")[[1]] , function(t) {try(parse(text=t))})
Error in parse(text = t) : <text>:2:0: unexpected end of input
1: ls(
^
expression(`print(2)` = print(2), ` ls(` = "Error in parse(text = t) :
<text>:2:0: unexpected end of input\n1: ls(\n ^\n")
> Adrian
>
> On Thu, Sep 15, 2016 at 11:02 PM, Adrian Dușa <dusa.adr...@unibuc.ro> wrote:
>
>> On Thu, Sep 15, 2016 at 10:28 PM, William Dunlap <wdun...@tibco.com>
>> wrote:
>>
>>> The most reliable way to split such lines is with parse(text=x).
>>> Regular expressions don't do well with context-free grammars.
>>>
>>
>> Oh, that's right of course.
>>> as.character(parse(text = x))
>> [1] "foo <- \"3;4\"" "bar <- \"don't ; use semicolons\""
>>
>> That was simple enough, thanks very much,
>> Adrian
>>
>> --
>> Adrian Dusa
>> University of Bucharest
>> Romanian Social Data Archive
>> Soseaua Panduri nr.90
>> 050663 Bucharest sector 5
>> Romania
>>
>
>
>
> --
> Adrian Dusa
> University of Bucharest
> Romanian Social Data Archive
> Soseaua Panduri nr.90
> 050663 Bucharest sector 5
> Romania
>
> [[alternative HTML version deleted]]
>
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David Winsemius
Alameda, CA, USA
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