Align columns: Difference between revisions

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(J: aesthetic changes)
(Added REBOL example.)
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justified, right justified, or center justified within its column.
justified, right justified, or center justified within its column.
</pre></div>
</pre></div>

=={{header|REBOL}}==
<lang rebol>REBOL [
Title: "Align Columns"
Author: oofoe
Date: 2010-09-29
URL: http://rosettacode.org/wiki/Align_columns
]

specimen: {Given$a$text$file$of$many$lines,$where$fields$within$a$line$
are$delineated$by$a$single$'dollar'$character,$write$a$program
that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$
column$are$separated$by$at$least$one$space.
Further,$allow$for$each$word$in$a$column$to$be$either$left$
justified,$right$justified,$or$center$justified$within$its$column.}

; Parse specimen into data grid.

data: copy []
foreach line parse specimen to-string lf [ ; Break into lines.
append/only data parse line "$" ; Break into columns.
]

; Compute independent widths for each column.

widths: copy [] insert/dup widths 0 length? data/1
foreach line data [
forall line [
i: index? line
widths/:i: max widths/:i length? line/1
]
]

pad: func [n /local x][x: copy "" insert/dup x " " n x]

; These formatting functions are passed as arguments to entable.

right: func [n s][rejoin [pad n - length? s s]]

left: func [n s][rejoin [s pad n - length? s]]

centre: func [n s /local h][
h: round/down (n - length? s) / 2
rejoin [pad h s pad n - h - length? s]
]

; Display data as table.

entable: func [data format] [
foreach line data [
forall line [
prin rejoin [format pick widths index? line line/1 " "]
]
print ""
]
]

; Format data table.

foreach i [left centre right] [
print ["^/Align" i "...^/"] entable data get i]
</lang>

Sample output:

<pre>Align left ...

Given a text file of many lines, where fields within a line
are delineated by a single 'dollar' character, write a program
that aligns each column of fields by ensuring that words in each
column are separated by at least one space.
Further, allow for each word in a column to be either left
justified, right justified, or center justified within its column.

Align centre ...

Given a text file of many lines, where fields within a line
are delineated by a single 'dollar' character, write a program
that aligns each column of fields by ensuring that words in each
column are separated by at least one space.
Further, allow for each word in a column to be either left
justified, right justified, or center justified within its column.

Align right ...

Given a text file of many lines, where fields within a line
are delineated by a single 'dollar' character, write a program
that aligns each column of fields by ensuring that words in each
column are separated by at least one space.
Further, allow for each word in a column to be either left</pre>


=={{header|REXX}}==
=={{header|REXX}}==
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