September 2017 Update
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Ingy döt Net
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14570 changed files with 153136 additions and 63871 deletions
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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 to the terminal. */
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input= '((data "quoted data" 123 4.5) (data (!@# (4.5) "(more" "data)")))'
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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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say center('input', length(input), "═") /*display the header title to terminal.*/
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say input /* " " input data " " */
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say copies('═', length(input) ) /* " " header sep " " */
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grpO.=; grpO.1 = '{' ; grpC.1 = "}" /*pair of grouping symbol: braces */
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grpO.2 = '[' ; grpC.2 = "]" /* " " " " brackets */
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grpO.3 = '(' ; grpC.3 = ")" /* " " " " parentheses */
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grpO.4 = '«' ; grpC.4 = "»" /* " " " " guillemets */
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q.=; q.1 = "'" ; q.2 = '"' /*1st and 2nd literal string delimiter.*/
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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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atoms = ' 'seps /* " " 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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quoted = 0 /*quotation level (for nested quotes).*/
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grpU = /*used to go up an expression level.*/
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grpD = /* " " " down " " " */
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@.=; do n=1 while grpO.n\==''
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atoms = atoms || grpO.n || grpC.n /*add Open and Closed groups to ATOMS.*/
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grpU = grpU || grpO.n /*add Open groups to GRPU, */
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grpD = grpD || grpC.n /*add Closed groups to GRPD, */
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end /*n*/ /* [↑] handle a bunch of grouping syms*/
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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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!=
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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; 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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do k=1 while q.k\==''; literals=literals || q.k /*add literal delimiters*/
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end /*k*/
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!=; literalStart=
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do j=1 to length(input); $=substr(input, j, 1) /* ◄■■■■■text parsing*/
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/* ◄■■■■■text parsing*/
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if quoted then do; !=! || $; if $==literalStart then quoted=0 /* ◄■■■■■text parsing*/
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iterate /* ◄■■■■■text parsing*/
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end /* [↑] handle running quoted str.*/ /* ◄■■■■■text parsing*/
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/* ◄■■■■■text parsing*/
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if pos($, literals)\==0 then do; literalStart=$; !=! || $; quoted=1 /* ◄■■■■■text parsing*/
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iterate /* ◄■■■■■text parsing*/
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end /* [↑] handle start of quoted str.*/ /* ◄■■■■■text parsing*/
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/* ◄■■■■■text parsing*/
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if pos($, atoms)==0 then do; !=! || $ ; iterate; end /*is an atom?*/ /* ◄■■■■■text parsing*/
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else do; call add!; !=$; end /*isn't an atam?*/ /* ◄■■■■■text parsing*/
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/* ◄■■■■■text parsing*/
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if pos($, literals)==0 then do; if pos($, grpU)\==0 then level=level + 1 /* ◄■■■■■text parsing*/
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call add! /* ◄■■■■■text parsing*/
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if pos($, grpD)\==0 then level=level - 1 /* ◄■■■■■text parsing*/
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if level<0 then say 'error, mismatched' $ /* ◄■■■■■text parsing*/
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end /* ◄■■■■■text parsing*/
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end /*j*/ /* ◄■■■■■text parsing*/
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/* ◄■■■■■text parsing*/
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call add! /*process any residual tokens.*/ /* ◄■■■■■text parsing*/
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if level\==0 then say 'error, mismatched grouping symbol' /* ◄■■■■■text parsing*/
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if quoted then say 'error, no end of quoted literal' literalStart /* ◄■■■■■text parsing*/
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do m=1 for #; say $.m; end /*m*/ /*display the tokens to the terminal. */
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do m=1 for #; say @.m; end /*m*/ /*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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add!: if !='' then return; #=#+1; @.#=left("", max(0, tabs*(level-1)))!; !=; return
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