32 lines
2.3 KiB
Rexx
32 lines
2.3 KiB
Rexx
/*REXX program displays various alignments for words in an array of text strings. */
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cols=0; size=0; wid.=0; t.=; @.= /*zero or nullify some variables. */
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/* [↓] some "text" lines. */
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t.1 = "Given$a$text$file$of$many$lines,$where$fields$within$a$line$"
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t.2 = "are$delineated$by$a$single$'dollar'$character,$write$a$program"
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t.3 = "that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$"
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t.4 = "column$are$separated$by$at$least$one$space."
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t.5 = "Further,$allow$for$each$word$in$a$column$to$be$either$left$"
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t.6 = "justified,$right$justified,$or$center$justified$within$its$column."
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/* [↑] a null line is the end of text.*/
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do r=1 while t.r\=='' /* [↓] process all the text lines. */
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_=strip(t.r,,'$') /*strip leading & trailing dollar signs*/
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do c=1 until _=='' /* [↓] process each of the words. */
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parse var _ @.r.c '$' _
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wid.c=max(wid.c, length(@.r.c)) /*find the maximum word width. */
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end /*c*/
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cols=max(cols,c) /*use the maximum COLS found. */
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end /*r*/
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do k=1 for cols; size=size+wid.k; end /*find the width of the biggest line. */
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rows=r-1 /*adjust ROWS because of the DO loop.*/
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do j=1 for 3; say; say /*show two blank lines for a separator.*/
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say center(word('left right center', j) "aligned", size+cols-1, "═") /*show title*/
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do r=1 for rows; _= /*construct row by row. */
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do c=1 for cols; x=@.r.c /* " col " col. */
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if j==1 then _=_ left(x, wid.c) /*justified left. */
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if j==2 then _=_ right(x, wid.c) /* " right. */
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if j==3 then _=_ centre(x, wid.c) /* " center. */
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end /*c*/
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say substr(_, 2) /*ignore the leading extra blank. */
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end /*r*/
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end /*j*/ /*stick a fork in it, we're all done. */
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