Return to cppp.icn CVS log

Up to [CSRG BSD Unix] / 43BSD / contrib / icon / src / cmd

Annotation of 43BSD/contrib/icon/src/cmd/cppp.icn, revision 1.1

1.1     ! root        1: #      CPPP(1)
        !             2: #
        !             3: #      Expand C conditionals
        !             4: #
        !             5: #      Ralph E. Griswold
        !             6: #
        !             7: #      Last modified 8/14/84
        !             8: #
        !             9: 
        !            10: procedure main(x)
        !            11:    local s, line, name, alist, dlist, ulist, process, ptype, delete
        !            12:    dlist := []                         # list of things to be defined
        !            13:    ulist := []                         # list of things to be undefined
        !            14:    delete := string                    #  efficient no-op
        !            15:    every s := !x do                    #  process options
        !            16:       if s == "-d" then alist := dlist
        !            17:       else if s == "-u" then alist := ulist
        !            18:       else put(\alist,s) | stop("usage: [-d names ] [-u names ]")
        !            19:    process := write                    # accept by default
        !            20:    name := []                          # stack of defined names
        !            21:    ptype := [write]                    # stack of processes
        !            22:    while line := read() do
        !            23:       if line[1] ~== "#" then process(line)
        !            24:       else if line ?
        !            25:          (conditional("define" | "undef") == (!dlist | !ulist)) then next
        !            26:       else if line ? (push(name,conditional("ifdef"))) then {
        !            27:          push(ptype,process)
        !            28:          if name[1] == !dlist then process := write
        !            29:          else if name[1] == !ulist then process := delete
        !            30:          else process(line)
        !            31:          }
        !            32:       else if line ? conditional("endif") then {
        !            33:          if not(name[1] == (!dlist | !ulist)) then process(line)
        !            34:          pop(name)
        !            35:          process := pop(ptype)
        !            36:          }
        !            37:       else if line ? (push(name,conditional("ifndef"))) then {
        !            38:          push(ptype,process)
        !            39:          if name[1] == !ulist then process := write
        !            40:          else if name[1] == !dlist then process := delete
        !            41:          else process(line)
        !            42:          }
        !            43:       else if line ? conditional("else") then {
        !            44:          if name[1] == !dlist then process := delete
        !            45:          else if name[1] == !ulist then process := write
        !            46:          else process(line)
        !            47:          }
        !            48:       else process(line)
        !            49: end
        !            50: 
        !            51: #  look for conditional line
        !            52: #
        !            53: procedure conditional(type)
        !            54:    static ws
        !            55:    initial ws := ' \t'
        !            56:    return {
        !            57:       ="#" &
        !            58:       (tab(many(ws)) | "") &
        !            59:       =type &
        !            60:       (tab(many(ws)) | "") &
        !            61:       tab(upto(ws) | 0)
        !            62:       }
        !            63: end
        !            64: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.