Duck util-proc.
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5 changed files with 109 additions and 64 deletions
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@ -274,3 +274,69 @@ most scheme implementations.
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Returns a list containing only elements matching given ```pred?```
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Returns a list containing only elements matching given ```pred?```
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predicate.
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predicate.
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## util-proc [module]
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(import util-proc)
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This module provides a few simple procedures for querying properties
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of other procedures.
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### improper-list-info [procedure]
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(improper-list-info lst)
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Returns two values: the proper part of the list length and #t if
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there is an improper list end
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### (procedure-arity=? n) [procedure]
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((procedure-arity=? proc)
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n)
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* ```n``` - integer representing the number of arguments
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* ```proc``` - procedure to query
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Returns true if the procedure ```proc``` accepts exactly ```n```
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arguments.
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### (procedure-arity>=? n) [procedure]
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((procedure-arity>=? proc)
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n)
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* ```n``` - integer representing the number of arguments
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* ```proc``` - procedure to query
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Returns true if the procedure ```proc``` accepts at least ```n```
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arguments.
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### (procedure-arity>? n) [procedure]
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((procedure-arity>? proc)
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n)
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* ```n``` - integer representing the number of arguments
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* ```proc``` - procedure to query
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Returns true if the procedure ```proc``` accepts more than ```n```
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arguments.
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### procedure-num-args [procedure]
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(procedure-num-args proc)
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* ```proc``` - procedure to check
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Returns the number of mandatory arguments.
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### procedure-arg-names [procedure]
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(procedure-arg-names proc)
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* ```proc``` - procedure to check
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Returns the (possibly improper) list of arguments the procedure
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```proc``` accepts. If it accepts arbitrary number of arguments, it is
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signalled by simple symbol instead of pair at the last position. If it
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accepts an exact number of arguments, it returns a proper list.
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46
doc/utils.md
46
doc/utils.md
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@ -162,52 +162,6 @@ sent to the address stored within.
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Sends email using mail(1) command. The arguments ```#:to``` and
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Sends email using mail(1) command. The arguments ```#:to``` and
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```#:subject``` are mandatory. Argument ```#:from``` is optional.
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```#:subject``` are mandatory. Argument ```#:from``` is optional.
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### Proc
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(import util-proc)
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This module provides a few simple procedures for querying properties
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of other procedures.
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((procedure-arity=? n) proc)
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* ```n``` - integer representing the number of arguments
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* ```proc``` - procedure to query
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Returns true if the procedure ```proc``` accepts exactly ```n```
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arguments.
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((procedure-arity>=? n) proc)
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* ```n``` - integer representing the number of arguments
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* ```proc``` - procedure to query
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Returns true if the procedure ```proc``` accepts at least ```n```
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arguments.
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((procedure-arity>? n) proc)
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* ```n``` - integer representing the number of arguments
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* ```proc``` - procedure to query
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Returns true if the procedure ```proc``` accepts more than ```n```
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arguments.
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(procedure-num-args proc)
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* ```proc``` - procedure to check
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Returns the number of mandatory arguments.
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(procedure-arg-names proc)
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* ```proc``` - procedure to check
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Returns the (possibly improper) list of arguments the procedure
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```proc``` accepts. If it accepts arbitrary number of arguments, it is
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signalled by simple symbol instead of pair at the last position. If it
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accepts an exact number of arguments, it returns a proper list.
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### Set (List)
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### Set (List)
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(import util-set-list)
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(import util-set-list)
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@ -60,11 +60,12 @@ HACKERBASE-OBJS=hackerbase.o testing.o listing.o cal-month.o \
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GENDOC-SOURCES=gendoc.scm duck-extract.import.scm \
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GENDOC-SOURCES=gendoc.scm duck-extract.import.scm \
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util-time.import.scm util-csv.import.scm util-git.import.scm \
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util-time.import.scm util-csv.import.scm util-git.import.scm \
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util-io.import.scm util-stdout.import.scm \
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util-io.import.scm util-stdout.import.scm \
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util-parser.import.scm util-list.import.scm
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util-parser.import.scm util-list.import.scm \
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util-proc.import.scm
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GENDOC-OBJS=gendoc.o duck-extract.o util-time.o util-csv.o util-io.o \
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GENDOC-OBJS=gendoc.o duck-extract.o util-time.o util-csv.o util-io.o \
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progress.o testing.o util-proc.o util-git.o util-io.o \
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progress.o testing.o util-proc.o util-git.o util-io.o \
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util-stdout.o util-parser.o util-list.o
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util-stdout.o util-parser.o util-list.o util-proc.o
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.PHONY: imports
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.PHONY: imports
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imports: $(HACKERBASE-DEPS)
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imports: $(HACKERBASE-DEPS)
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@ -130,7 +131,7 @@ listing.import.scm: $(LISTING-SOURCES)
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UTIL-DICT-LIST-SOURCES=util-dict-list.scm testing.import.scm \
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UTIL-DICT-LIST-SOURCES=util-dict-list.scm testing.import.scm \
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util-tag.import.scm util-proc.import.scm \
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util-tag.import.scm util-proc.import.scm \
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util-set-list.import.scm
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util-set-list.import.scm duck.import.scm
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util-dict-list.o: util-dict-list.import.scm
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util-dict-list.o: util-dict-list.import.scm
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util-dict-list.import.scm: $(UTIL-DICT-LIST-SOURCES)
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util-dict-list.import.scm: $(UTIL-DICT-LIST-SOURCES)
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@ -26,4 +26,5 @@
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util-io
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util-io
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util-stdout
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util-stdout
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util-parser
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util-parser
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util-list)
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util-list
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util-proc)
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@ -25,8 +25,12 @@
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(declare (unit util-proc))
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(declare (unit util-proc))
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(module
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(import duck)
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(module*
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util-proc
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util-proc
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#:doc ("This module provides a few simple procedures for querying properties
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of other procedures.")
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(
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(
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improper-list-info
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improper-list-info
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@ -41,9 +45,9 @@
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(import scheme
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(import scheme
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(chicken base))
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(chicken base))
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;; Returns two values: the proper part of the list length and #t if
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(define/doc (improper-list-info lst)
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;; there is an improper list end
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("Returns two values: the proper part of the list length and #t if
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(define (improper-list-info lst)
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there is an improper list end")
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(let loop ((lst lst)
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(let loop ((lst lst)
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(len 0))
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(len 0))
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(if (symbol? lst)
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(if (symbol? lst)
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@ -59,31 +63,50 @@
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(let-values (((len rest?) (improper-list-info (procedure-information proc))))
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(let-values (((len rest?) (improper-list-info (procedure-information proc))))
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(values (sub1 len) rest?)))
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(values (sub1 len) rest?)))
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;; Returns true if given procedure arity is exactly n
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(define/doc ((procedure-arity=? n) proc)
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(define ((procedure-arity=? n) proc)
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("* ```n``` - integer representing the number of arguments
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* ```proc``` - procedure to query
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Returns true if the procedure ```proc``` accepts exactly ```n```
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arguments.")
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(let-values (((args rest?) (procedure-arity-info proc)))
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(let-values (((args rest?) (procedure-arity-info proc)))
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(and (not rest?)
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(and (not rest?)
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(= args n))))
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(= args n))))
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;; Returns true if given procedure arity is greater than or equal to n
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(define/doc ((procedure-arity>=? n) proc)
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(define ((procedure-arity>=? n) proc)
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("* ```n``` - integer representing the number of arguments
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* ```proc``` - procedure to query
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Returns true if the procedure ```proc``` accepts at least ```n```
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arguments.")
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(let-values (((args rest?) (procedure-arity-info proc)))
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(let-values (((args rest?) (procedure-arity-info proc)))
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(or rest?
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(or rest?
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(>= args n))))
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(>= args n))))
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;; Returns true if given procedure arity is greater than n
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(define/doc ((procedure-arity>? n) proc)
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(define ((procedure-arity>? n) proc)
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("* ```n``` - integer representing the number of arguments
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* ```proc``` - procedure to query
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Returns true if the procedure ```proc``` accepts more than ```n```
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arguments.")
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(let-values (((args rest?) (procedure-arity-info proc)))
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(let-values (((args rest?) (procedure-arity-info proc)))
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(or rest?
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(or rest?
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(> args n))))
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(> args n))))
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;; Returns the number of mandatory arguments
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(define/doc (procedure-num-args proc)
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(define (procedure-num-args proc)
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("* ```proc``` - procedure to check
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Returns the number of mandatory arguments.")
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(let-values (((args rest?) (procedure-arity-info proc)))
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(let-values (((args rest?) (procedure-arity-info proc)))
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args))
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args))
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;; Returns the formal argument names for given procedure
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(define/doc (procedure-arg-names proc)
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(define (procedure-arg-names proc)
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("* ```proc``` - procedure to check
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Returns the (possibly improper) list of arguments the procedure
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```proc``` accepts. If it accepts arbitrary number of arguments, it is
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signalled by simple symbol instead of pair at the last position. If it
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accepts an exact number of arguments, it returns a proper list.")
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(cdr (procedure-information proc)))
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(cdr (procedure-information proc)))
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)
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)
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