Re^3: Treating file lines in a text file as a string

readline are <> are two names for the same op (readline).

>perl -MO=Concise -e"<FH>"
5  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
4     <1> readline[t2] vK/1 ->5
3        <#> gv[*FH] s ->4
-e syntax OK

>perl -MO=Concise -e"readline(*FH)"
6  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v ->3
5     <1> readline[t2] vK/1 ->6
4        <1> rv2gv sKR/1 ->5
3           <#> gv[*FH] s ->4
-e syntax OK
[download]

Similarly, ``, qx`` and readpipe are three names for the same op (backtick).

and and && are the same op, and or and || are the same op.

Finally, if and unless are implemented using the and and or ops respectively.

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Re^4: Treating file lines in a text file as a string by Burak (Chaplain) on May 22, 2008 at 12:15 UTC
"and and && are the same op, and or and \|\| are the same op." I think there is a difference (precedence) between these ops...	[reply]
Re^5: Treating file lines in a text file as a string by ikegami (Patriarch) on May 22, 2008 at 17:09 UTC
Precedence only affects parsing. The same op is used in the resulting tree for both of these operators. >perl -MO=Concise -e"$a and $b" 6 <@> leave[1 ref] vKP/REFC ->(end) 1 <0> enter ->2 2 <;> nextstate(main 1 -e:1) v ->3 - <1> null vK/1 ->6 4 <\|> and(other->5) vK/1 ->6 - <1> ex-rv2sv sK/1 ->4 3 <#> gvsv[a] s ->4 - <1> ex-rv2sv vK/1 ->- 5 <#> gvsv[b] s ->6 -e syntax OK >perl -MO=Concise -e"$a && $b" 6 <@> leave[1 ref] vKP/REFC ->(end) 1 <0> enter ->2 2 <;> nextstate(main 1 -e:1) v ->3 - <1> null vK/1 ->6 4 <\|> and(other->5) vK/1 ->6 - <1> ex-rv2sv sK/1 ->4 3 <#> gvsv[a] s ->4 - <1> ex-rv2sv vK/1 ->- 5 <#> gvsv[b] s ->6 -e syntax OK [download] And check out "`if`": `>perl -MO=Concise -e"if ($a) { $b }" 6 <@> leave[1 ref] vKP/REFC ->(end) 1 <0> enter ->2 2 <;> nextstate(main 3 -e:1) v ->3 - <1> null vK/1 ->6 4 <\|> and(other->5) vK/1 ->6 - <1> ex-rv2sv sK/1 ->4 3 <#> gvsv[a] s ->4 - <@> scope vK ->- \ The only difference - <0> ex-nextstate v ->5 / is the extra scope. - <1> ex-rv2sv vK/1 ->- 5 <#> gvsv[b] s ->6` [download]	[reply] [d/l] [select]