Another update from ingydotnet^djgoku
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Ingy döt Net
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7604 changed files with 108452 additions and 22726 deletions
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@ -1,75 +1,65 @@
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/*REXX program parses an S-expression and displays the results. */
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/*REXX program parses an S-expression and displays the results. */
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input= '((data "quoted data" 123 4.5) (data (!@# (4.5) "(more" "data)")))'
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say 'input:' /*indicate what is being shown. */
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say input /*echo the input to the screen. */
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say copies('═',length(input)) /*display a header fence. */
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$.= /*stem array to hold the tokens. */
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groupO.1 = '{' ; groupC.1 = '}' /*grouping symbols (Open & Close)*/
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groupO.2 = '[' ; groupC.2 = ']' /* " " " " " */
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groupO.3 = '(' ; groupC.3 = ')' /* " " " " " */
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groupSym = 3 /*the number of grouping symbols.*/
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# = 0 /*the number of tokens. */
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tabs = 10 /*used for indenting the levels. */
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q.1 = "'" /*literal string delimiter, 1st. */
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q.2 = '"' /* " " " 2nd. */
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numLits = 2 /*number of kinds of literals. */
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seps = ',;' /*characters used for separation.*/
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atoms = ' 'seps /*characters used to sep atoms. */
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level = 0 /*current level being processed. */
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quoted = 0 /*quotation level (when nested). */
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groupu = /*used to go ↑ an expresion level*/
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groupd = /* " " " ↓ " " " */
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do n=1 for groupSym /*handle for # grouping symbols. */
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atoms = atoms || groupO.n || groupC.n
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groupu = groupu || groupO.n
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groupd = groupd || groupC.n
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end /*n*/
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say 'input:'; say input /*display the input data string to term*/
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say copies('═',length(input)) /*also, display a header fence. */
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groupO.= /*default value for grouping symbols. */
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groupO.1 = '{' ; groupC.1 = '}' /*grouping symbols (Open & Close). */
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groupO.2 = '[' ; groupC.2 = ']' /* " " " " " */
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groupO.3 = '(' ; groupC.3 = ')' /* " " " " " */
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# = 0 /*the number of tokens found (so far). */
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tabs = 10 /*used for the indenting of the levels.*/
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q.1 = "'" /*literal string delimiter, first. */
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q.2 = '"' /* " " " second. */
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numLits = 2 /*the number of kinds of literals. */
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seps = ',;' /*characters used for separation. */
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atoms = ' 'seps /*characters used to separate atoms. */
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level = 0 /*the current level being processed. */
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quoted = 0 /*quotation level (when nested). */
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groupu = /*used to go ↑ an expression level. */
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groupd = /* " " " ↓ " " " */
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$.= /*the stem array to hold the tokens. */
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do n=1 while groupO.n\=='' /*handle the number of grouping symbols*/
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atoms =atoms || groupO.n || groupC.n
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groupu=groupu || groupO.n
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groupd=groupd || groupC.n
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end /*n*/
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literals=
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do k=1 for numLits
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literals = literals || q.k
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end /*k*/
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do k=1 for numLits
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literals=literals || q.k
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end /*k*/
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!=
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/*═════════════════════════════════════start of the text parsing.═══════*/
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do j=1 to length(input); _ = substr(input,j,1)
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if quoted then do
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!=! || _
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if _==literalStart then quoted=0
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iterate
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end
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/*▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ text parsing ▒▒▒▒▒▒▒▒*/
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do j=1 to length(input); _=substr(input,j,1) /*▒*/
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/*▒*/
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if quoted then do; !=! || _ /*▒*/
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if _==literalStart then quoted=0 /*▒*/
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iterate /*▒*/
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end /*▒*/
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/*▒*/
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if pos(_,literals)\==0 then do; literalStart=_ /*▒*/
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!=! || _ /*▒*/
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quoted=1 /*▒*/
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iterate /*▒*/
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end /*▒*/
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/*▒*/
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if pos(_,atoms)==0 then do; !=! || _ ; iterate; end /*▒*/
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else do; call add!; !=_; end /*▒*/
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/*▒*/
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if pos(_,literals)==0 then do /*▒*/
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if pos(_,groupu)\==0 then level=level+1 /*▒*/
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call add! /*▒*/
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if pos(_,groupd)\==0 then level=level-1 /*▒*/
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if level<0 then say 'oops, mismatched' _ /*▒*/
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end /*▒*/
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end /*j*/ /*▒*/
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/*▒*/
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call add! /*handle any residual tokens.*/ /*▒*/
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if level\==0 then say 'oops, mismatched grouping symbol' /*▒*/
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if quoted then say 'oops, no end of quoted literal' literalStart /*▒*/
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/*▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒*/
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if pos(_,literals)\==0 then do
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literalStart = _
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! = ! || _
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quoted = 1
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iterate
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end
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if pos(_,atoms)==0 then do; !=! || _ ; iterate; end
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else do; call add!; ! = _ ; end
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if pos(_,literals)==0 then do
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if pos(_,groupu)\==0 then level=level+1
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call add!
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if pos(_,groupd)\==0 then level=level-1
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if level<0 then say 'oops, mismatched' _
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iterate
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end
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end /*j*/
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call add! /*handle any residual tokens. */
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if level\==0 then say 'oops, mismatched grouping symbol'
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if quoted then say 'oops, no end of quoted literal' literalStart
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/*═════════════════════════════════════end of text parsing.═════════════*/
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do j=1 for #
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say $.j
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end /*j*/
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exit /*stick a fork in it, we're done.*/
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/*──────────────────────────────────ADD! subroutine─────────────────────*/
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add!: if !\='' then do
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#=#+1
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$.#=left('',max(0,tabs*(level-1)))!
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end
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!=
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return
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do j=1 for #; say $.j; end /*display the tokens to the terminal. */
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exit /*stick a fork in it, we're all done. */
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/*────────────────────────────────────────────────────────────────────────────*/
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add!: if !\='' then do; #=#+1; $.#=left('', max(0, tabs*(level-1)))!; end; !=
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return
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