Function frequency

From Rosetta Code
Task
Function frequency
You are encouraged to solve this task according to the task description, using any language you may know.

Display - for a program or runtime environment (whatever suits the style of your language) - the top ten most frequently occurring functions (or also identifiers or tokens, if preferred).

This is a static analysis: The question is not how often each function is actually executed at runtime, but how often it is used by the programmer.

Besides its practical usefulness, the intent of this task is to show how to do self-inspection within the language.

ACL2[edit]

This will, unfortunately, also catch variable names after an open paren, such as in (let ...) expressions.

(in-package "ACL2")
 
(set-state-ok t)
 
(defun read-all-objects (limit channel state)
(mv-let (eof obj state)
(read-object channel state)
(if (or eof (zp limit))
(mv nil state)
(mv-let (so-far state)
(read-all-objects (- limit 1) channel state)
(mv (cons obj so-far) state)))))
 
(defun list-starters (xs)
(cond ((endp xs) nil)
((consp (first xs))
(append (if (symbolp (first (first xs)))
(list (first (first xs)))
nil)
(list-starters (rest (first xs)))
(list-starters (rest xs))))
(t (list-starters (rest xs)))))
 
(defun invoked-functions (filename state)
(mv-let (channel state)
(open-input-channel filename :object state)
(mv-let (code state)
(read-all-objects 1000 channel state)
(mv (list-starters code) state))))
 
(defun increment-for (key alist)
(cond ((endp alist) (list (cons key 1)))
((equal key (car (first alist)))
(cons (cons key (1+ (cdr (first alist))))
(rest alist)))
(t (cons (first alist)
(increment-for key (rest alist))))))
 
(defun symbol-freq-table (symbols)
(if (endp symbols)
nil
(increment-for (first symbols)
(symbol-freq-table (rest symbols)))))
 
(defun insert-freq-table (pair alist)
(cond ((endp alist)
(list pair))
((> (cdr pair) (cdr (first alist)))
(cons pair alist))
(t (cons (first alist)
(insert-freq-table pair (rest alist))))))
 
(defun isort-freq-table (alist)
(if (endp alist)
nil
(insert-freq-table (first alist)
(isort-freq-table (rest alist)))))
 
(defun main (state)
(mv-let (fns state)
(invoked-functions "function-freq.lisp" state)
(mv (take 10 (isort-freq-table
(symbol-freq-table fns))) state)))

Output (for itself):

(((FIRST . 10)
  (REST . 8)
  (DEFUN . 8)
  (CONS . 7)
  (MV-LET . 5)
  (LIST-STARTERS . 4)
  (IF . 4)
  (MV . 4)
  (COND . 3)
  (LIST . 3))
 <state>)

AWK[edit]

 
# syntax: GAWK -f FUNCTION_FREQUENCY.AWK filename(s).AWK
#
# sorting:
# PROCINFO["sorted_in"] is used by GAWK
# SORTTYPE is used by Thompson Automation's TAWK
#
BEGIN {
# create array of keywords to be ignored by lexer
asplit("BEGIN:END:atan2:break:close:continue:cos:delete:" \
"do:else:exit:exp:for:getline:gsub:if:in:index:int:" \
"length:log:match:next:print:printf:rand:return:sin:" \
"split:sprintf:sqrt:srand:strftime:sub:substr:system:tolower:toupper:while",
keywords,":")
# build the symbol-state table
split("00:00:00:00:00:00:00:00:00:00:" \
"20:10:10:12:12:11:07:00:00:00:" \
"08:08:08:08:08:33:08:00:00:00:" \
"08:44:08:36:08:08:08:00:00:00:" \
"08:44:45:42:42:41:08",machine,":")
# parse the input
state = 1
for (;;) {
symb = lex() # get next symbol
nextstate = substr(machine[state symb],1,1)
act = substr(machine[state symb],2,1)
# perform required action
if (act == "0") { # do nothing
}
else if (act == "1") { # found a function call
if (!(inarray(tok,names))) {
names[++nnames] = tok
}
++xnames[tok]
}
else if (act == "2") { # found a variable or array
if (tok in Local) {
tok = tok "(" funcname ")"
if (!(inarray(tok,names))) {
names[++nnames] = tok
}
++xnames[tok]
}
else {
tok = tok "()"
if (!(inarray(tok,names))) {
names[++nnames] = tok
}
++xnames[tok]
}
}
else if (act == "3") { # found a function definition
funcname = tok
}
else if (act == "4") { # found a left brace
braces++
}
else if (act == "5") { # found a right brace
braces--
if (braces == 0) {
delete Local
funcname = ""
nextstate = 1
}
}
else if (act == "6") { # found a local variable declaration
Local[tok] = 1
}
else if (act == "7") { # found end of file
break
}
else if (act == "8") { # found an error
printf("error: FILENAME=%s, FNR=%d\n",FILENAME,FNR)
exit(1)
}
state = nextstate # finished with current token
}
# format function names
for (i=1; i<=nnames; i++) {
if (index(names[i],"(") == 0) {
tmp_arr[xnames[names[i]]][names[i]] = ""
}
}
# print function names
PROCINFO["sorted_in"] = "@ind_num_desc" ; SORTTYPE = 9
for (i in tmp_arr) {
PROCINFO["sorted_in"] = "@ind_str_asc" ; SORTTYPE = 1
for (j in tmp_arr[i]) {
if (++shown <= 10) {
printf("%d %s\n",i,j)
}
}
}
exit(0)
}
function asplit(str,arr,fs, i,n,temp_asplit) {
n = split(str,temp_asplit,fs)
for (i=1; i<=n; i++) {
arr[temp_asplit[i]]++
}
}
function inarray(val,arr, j) {
for (j in arr) {
if (arr[j] == val) {
return(j)
}
}
return("")
}
function lex() {
for (;;) {
if (tok == "(eof)") {
return(7)
}
while (length(line) == 0) {
if (getline line == 0) {
tok = "(eof)"
return(7)
}
}
sub(/^[ \t]+/,"",line) # remove white space,
sub(/^"([^"]|\\")*"/,"",line) # quoted strings,
sub(/^\/([^\/]|\\\/)+\//,"",line) # regular expressions,
sub(/^#.*/,"",line) # and comments
if (line ~ /^function /) {
tok = "function"
line = substr(line,10)
return(1)
}
else if (line ~ /^{/) {
tok = "{"
line = substr(line,2)
return(2)
}
else if (line ~ /^}/) {
tok = "}"
line = substr(line,2)
return(3)
}
else if (match(line,/^[A-Za-z_][A-Za-z_0-9]*\[/)) {
tok = substr(line,1,RLENGTH-1)
line = substr(line,RLENGTH+1)
return(5)
}
else if (match(line,/^[A-Za-z_][A-Za-z_0-9]*\(/)) {
tok = substr(line,1,RLENGTH-1)
line = substr(line,RLENGTH+1)
if (!(tok in keywords)) { return(6) }
}
else if (match(line,/^[A-Za-z_][A-Za-z_0-9]*/)) {
tok = substr(line,1,RLENGTH)
line = substr(line,RLENGTH+1)
if (!(tok in keywords)) { return(4) }
}
else {
match(line,/^[^A-Za-z_{}]/)
tok = substr(line,1,RLENGTH)
line = substr(line,RLENGTH+1)
}
}
}
 

Output of running FUNCTION_FREQUENCY.AWK on itself:

3 inarray
1 asplit
1 lex

Sample input:

BEGIN {
    f1()
    f2();f2()
    f3a();f3a();f3a()
    f3b();f3b();f3b()
    f4();f4();f4();f4()
    f5();f5();f5();f5();f5()
    exit(0)
}
function f0() { }
function f1() { }
function f2() { }
function f3a() { }
function f3b() { }
function f4() { }
function f5() { }

Sample output:

5 f5
4 f4
3 f3a
3 f3b
2 f2
1 f1

BBC BASIC[edit]

      INSTALL @lib$+"SORTLIB"
Sort% = FN_sortinit(1,0) : REM Descending
 
Valid$ = "[email protected]_`abcdefghijklmnopqrstuvwxyz"
DIM func$(1000), cnt%(1000)
nFunc% = 0
 
file% = OPENIN("*.bbc")
WHILE NOT EOF#file%
ll% = BGET#file%
no% = BGET#file% + 256*BGET#file%
INPUT #file%, l$
 
i% = 1
REPEAT
j% = INSTR(l$, CHR$&A4, i%) : REM Token for 'FN'
k% = INSTR(l$, CHR$&F2, i%) : REM Token for 'PROC'
IF k% IF j%=0 OR j%>k% THEN
i% = k%
f$ = "PROC"
ELSE
i% = j%
f$ = "FN"
ENDIF
IF i% THEN
REPEAT
i% += 1
f$ += MID$(l$, i%, 1)
UNTIL INSTR(Valid$, MID$(l$, i%+1, 1)) = 0
FOR j% = 0 TO nFunc%-1
IF f$ = func$(j%) EXIT FOR
NEXT
IF j% >= nFunc% nFunc% += 1
func$(j%) = f$
cnt%(j%) += 1
ENDIF
UNTIL i%=0
ENDWHILE
CLOSE #file%
 
C% = nFunc%
CALL Sort%, cnt%(0), func$(0)
 
IF C% > 10 C% = 10
FOR i% = 0 TO C%-1
PRINT func$(i%) " (" ; cnt%(i%) ")"
NEXT

Output (for file LBB.BBC):

FNcheck (291)
FNexpr (125)
FNtoken (49)
PROCout (41)
FNhandle (31)
FNupper (30)
FNitem (30)
FNcheckns (21)
FNinstrq (17)
FNchild (17)

C[edit]

This program treats doesn't differentiate between macros and functions. It works by looking for function calls which are not inside strings or comments. If a function call has a C style comment between the opening brace and the name of the function, this program will not recognize it as a function call.

 
#define _POSIX_SOURCE
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stddef.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
struct functionInfo {
char* name;
int timesCalled;
char marked;
};
void addToList(struct functionInfo** list, struct functionInfo toAdd, \
size_t* numElements, size_t* allocatedSize)
{
static const char* keywords[32] = {"auto", "break", "case", "char", "const", \
"continue", "default", "do", "double", \
"else", "enum", "extern", "float", "for", \
"goto", "if", "int", "long", "register", \
"return", "short", "signed", "sizeof", \
"static", "struct", "switch", "typedef", \
"union", "unsigned", "void", "volatile", \
"while"
};
int i;
/* If the "function" being called is actually a keyword, then ignore it */
for (i = 0; i < 32; i++) {
if (!strcmp(toAdd.name, keywords[i])) {
return;
}
}
if (!*list) {
*allocatedSize = 10;
*list = calloc(*allocatedSize, sizeof(struct functionInfo));
if (!*list) {
printf("Failed to allocate %lu elements of %lu bytes each.\n", \
*allocatedSize, sizeof(struct functionInfo));
abort();
}
(*list)[0].name = malloc(strlen(toAdd.name)+1);
if (!(*list)[0].name) {
printf("Failed to allocate %lu bytes.\n", strlen(toAdd.name)+1);
abort();
}
strcpy((*list)[0].name, toAdd.name);
(*list)[0].timesCalled = 1;
(*list)[0].marked = 0;
*numElements = 1;
} else {
char found = 0;
unsigned int i;
for (i = 0; i < *numElements; i++) {
if (!strcmp((*list)[i].name, toAdd.name)) {
found = 1;
(*list)[i].timesCalled++;
break;
}
}
if (!found) {
struct functionInfo* newList = calloc((*allocatedSize)+10, \
sizeof(struct functionInfo));
if (!newList) {
printf("Failed to allocate %lu elements of %lu bytes each.\n", \
(*allocatedSize)+10, sizeof(struct functionInfo));
abort();
}
memcpy(newList, *list, (*allocatedSize)*sizeof(struct functionInfo));
free(*list);
*allocatedSize += 10;
*list = newList;
(*list)[*numElements].name = malloc(strlen(toAdd.name)+1);
if (!(*list)[*numElements].name) {
printf("Failed to allocate %lu bytes.\n", strlen(toAdd.name)+1);
abort();
}
strcpy((*list)[*numElements].name, toAdd.name);
(*list)[*numElements].timesCalled = 1;
(*list)[*numElements].marked = 0;
(*numElements)++;
}
}
}
void printList(struct functionInfo** list, size_t numElements)
{
char maxSet = 0;
unsigned int i;
size_t maxIndex = 0;
for (i = 0; i<10; i++) {
maxSet = 0;
size_t j;
for (j = 0; j<numElements; j++) {
if (!maxSet || (*list)[j].timesCalled > (*list)[maxIndex].timesCalled) {
if (!(*list)[j].marked) {
maxSet = 1;
maxIndex = j;
}
}
}
(*list)[maxIndex].marked = 1;
printf("%s() called %d times.\n", (*list)[maxIndex].name, \
(*list)[maxIndex].timesCalled);
}
}
void freeList(struct functionInfo** list, size_t numElements)
{
size_t i;
for (i = 0; i<numElements; i++) {
free((*list)[i].name);
}
free(*list);
}
char* extractFunctionName(char* readHead)
{
char* identifier = readHead;
if (isalpha(*identifier) || *identifier == '_') {
while (isalnum(*identifier) || *identifier == '_') {
identifier++;
}
}
/* Search forward for spaces and then an open parenthesis
* but do not include this in the function name.
*/

char* toParen = identifier;
if (toParen == readHead) return NULL;
while (isspace(*toParen)) {
toParen++;
}
if (*toParen != '(') return NULL;
/* Copy the found function name to the output string */
ptrdiff_t size = (ptrdiff_t)((ptrdiff_t)identifier) \
- ((ptrdiff_t)readHead)+1;
char* const name = malloc(size);
if (!name) {
printf("Failed to allocate %lu bytes.\n", size);
abort();
}
name[size-1] = '\0';
memcpy(name, readHead, size-1);
/* Function names can't be blank */
if (strcmp(name, "")) {
return name;
}
free(name);
return NULL;
}
int main(int argc, char** argv)
{
int i;
for (i = 1; i<argc; i++) {
errno = 0;
FILE* file = fopen(argv[i], "r");
if (errno || !file) {
printf("fopen() failed with error code \"%s\"\n", \
strerror(errno));
abort();
}
char comment = 0;
#define DOUBLEQUOTE 1
#define SINGLEQUOTE 2
int string = 0;
struct functionInfo* functions = NULL;
struct functionInfo toAdd;
size_t numElements = 0;
size_t allocatedSize = 0;
struct stat metaData;
errno = 0;
if (fstat(fileno(file), &metaData) < 0) {
printf("fstat() returned error \"%s\"\n", strerror(errno));
abort();
}
char* mmappedSource = (char*)mmap(NULL, metaData.st_size, PROT_READ, \
MAP_PRIVATE, fileno(file), 0);
if (errno) {
printf("mmap() failed with error \"%s\"\n", strerror(errno));
abort();
}
if (!mmappedSource) {
printf("mmap() returned NULL.\n");
abort();
}
char* readHead = mmappedSource;
while (readHead < mmappedSource + metaData.st_size) {
while (*readHead) {
/* Ignore comments inside strings */
if (!string) {
if (*readHead == '/' && !strncmp(readHead, "/*", 2)) {
comment = 1;
}
if (*readHead == '*' && !strncmp(readHead, "*/", 2)) {
comment = 0;
}
}
/* Ignore strings inside comments */
if (!comment) {
if (*readHead == '"') {
if (!string) {
string = DOUBLEQUOTE;
} else if (string == DOUBLEQUOTE) {
/* Only toggle string mode if the quote character
* is not escaped
*/

if (strncmp((readHead-1), "\\\"", 2)) {
string = 0;
}
}
}
if (*readHead == '\'') {
if (!string) {
string = SINGLEQUOTE;
} else if (string == SINGLEQUOTE) {
if (strncmp((readHead-1), "\\\'", 2)) {
string = 0;
}
}
}
}
/* Look for identifiers outside of any comment or string */
if (!comment && !string) {
char* name = extractFunctionName(readHead);
/* Don't read part of an identifier on the next iteration */
if (name) {
toAdd.name = name;
addToList(&functions, toAdd, &numElements, &allocatedSize);
readHead += strlen(name);
}
free(name);
}
readHead++;
}
}
errno = 0;
munmap(mmappedSource, metaData.st_size);
if (errno) {
printf("munmap() returned error \"%s\"\n", strerror(errno));
abort();
}
errno = 0;
fclose(file);
if (errno) {
printf("fclose() returned error \"%s\"\n", strerror(errno));
abort();
}
printList(&functions, numElements);
freeList(&functions, numElements);
}
return 0;
}

Common Lisp[edit]

Loading the file itself before scanning it is the quickest way to determine what function bindings would be created.

(defun mapc-tree (fn tree)
"Apply FN to all elements in TREE."
(cond ((consp tree)
(mapc-tree fn (car tree))
(mapc-tree fn (cdr tree)))
(t (funcall fn tree))))
 
(defun count-source (source)
"Load and count all function-bound symbols in a SOURCE file."
(load source)
(with-open-file (s source)
(let ((table (make-hash-table)))
(loop for data = (read s nil nil)
while data
do (mapc-tree
(lambda (x)
(when (and (symbolp x) (fboundp x))
(incf (gethash x table 0))))
data))
table)))
 
(defun hash-to-alist (table)
"Convert a hashtable to an alist."
(let ((alist))
(maphash (lambda (k v) (push (cons k v) alist)) table)
alist))
 
(defun take (n list)
"Take at most N elements from LIST."
(loop repeat n for x in list collect x))
 
(defun top-10 (table)
"Get the top 10 from the source counts TABLE."
(take 10 (sort (hash-to-alist table) '> :key 'cdr)))
Output:
CL-USER> (top-10 (count-source "function-frequency.lisp"))
((DEFUN . 5) (MAPC-TREE . 4) (QUOTE . 2) (LIST . 2) (TAKE . 2)
 (HASH-TO-ALIST . 2) (LAMBDA . 2) (LOOP . 2) (LET . 2) (CDR . 2))

Erlang[edit]

This is source code analyse. Mainly because I have never done that before.

 
-module( function_frequency ).
 
-export( [erlang_source/1, task/0] ).
 
erlang_source( File ) ->
{ok, IO} = file:open( File, [read] ),
Forms = parse_all( IO, io:parse_erl_form(IO, ''), [] ),
Functions = lists:flatten( [erl_syntax_lib:fold(fun accumulate_functions/2, [], X) || X <- Forms] ),
dict:to_list( lists:foldl(fun count/2, dict:new(), Functions) ).
 
task() ->
Function_frequencies = erlang_source( "function_frequency.erl" ),
{Top_tens, _Rest} = lists:split( 10, lists:reverse(lists:keysort(2, Function_frequencies)) ),
[io:fwrite("Function ~p called ~p times.~n", [X, Y]) || {X, Y} <- Top_tens].
 
 
 
accumulate_functions( Tree, Acc ) -> accumulate_functions( erlang:element(1, Tree), Tree, Acc ).
 
accumulate_functions( call, Tree, Acc ) -> [accumulate_functions_name(Tree) | Acc];
accumulate_functions( _Other, _Tree, Acc ) -> Acc.
 
accumulate_functions_name( Tree ) -> accumulate_functions_name_scoop( erlang:element(3, Tree) ).
 
accumulate_functions_name_scoop( {atom, _Line, Name} ) -> Name;
accumulate_functions_name_scoop( {remote, _Line, {atom, _Line, Module}, {atom, _Line, Name}} ) -> {Module, Name}.
 
count( Key, Dict ) -> dict:update_counter( Key, 1, Dict ).
 
parse_all( _IO, {eof, _End}, Acc ) -> Acc;
parse_all( IO, {ok, Tokens, Location}, Acc ) -> parse_all( IO, io:parse_erl_form(IO, '', Location), [Tokens | Acc] ).
 
Output:
7> function_frequency:task().
Function parse_all called 2 times.
Function {erlang,element} called 2 times.
Function {io,parse_erl_form} called 2 times.
Function {lists,flatten} called 1 times.
Function {dict,update_counter} called 1 times.
Function {lists,reverse} called 1 times.
Function {lists,foldl} called 1 times.
Function {io,fwrite} called 1 times.
Function accumulate_functions_name called 1 times.
Function erlang_source called 1 times.

Forth[edit]

Counts colon definitions, variables, constants, words defined by definers like CREATE..DOES>, etc. Check for levels of top from command line, by default 4. GForth 0.7.0 specific.

' noop is bootmessage
 
\ --- LIST OF CONSTANTS
\ WORD# maximum word size
\ RING# size of `Rings' element
\ DEFS definitions
\ KEYS
\
\ --- LIST OF VARIABLES
\ cmpl? is compiling?
\ cword current compiled word
 
wordlist constant DEFS
wordlist constant KEYS
 
\ --- Compiling
50 constant WORD#
: >>fPAD ( ca u -- ; u < 51 )
PAD 80 blank s" create " PAD swap MOVE
s" 1 , DOES> 1 swap +! ;" PAD 57 + swap MOVE
WORD# min PAD 7 + swap MOVE ;
 
: funcmpl ( ca u -- )
>>fPAD current @ DEFS current !
PAD 80 evaluate current ! ;
 
: >>kPAD ( ca u -- ; )
PAD 80 blank s" : " PAD swap MOVE
s" parse-name funcmpl ;" PAD 59 + swap MOVE
WORD# min PAD 2 + swap MOVE ;
 
: keycmpl ( ca u -- )
>>kPAD current @ KEYS current !
PAD 80 evaluate current ! ;
 
\ --- Interpreter
: intp BEGIN parse-name dup
WHILE ( ca u )
2dup KEYS search-wordlist
IF execute 2drop
ELSE DEFS search-wordlist IF execute THEN
THEN
REPEAT 2drop ;
 
: run BEGIN refill WHILE intp REPEAT ;
 
\ --- Lists&Rings
warnings OFF
: LIST ( node -- ) ]] BEGIN @ dup WHILE >R [[ ; immediate
warnings ON
: LOOP-LIST ( -- ) ]] R> REPEAT drop [[ ; immediate
 
: empty-ring? ( node -- f ) dup @ = ;
: RING ( node -- ) ]] dup BEGIN @ 2dup <> WHILE 2>R [[ ; immediate
: LOOP-RING ( -- ) ]] 2R> REPEAT 2drop [[ ; immediate
 
: new-node ( -- node )
here dup , ;
: do-link ( node new-node -- ; do link after current node )
over @ over ! swap ! ;
 
\ --- Sorting..
: nt>freq ( nt -- n ;frequency of uses )
name>int >BODY @ ;
 
: @maxfreq ( wid -- n ;maximum frequency )
0 swap cell+
LIST ( max )
I nt>freq 2dup <
IF nip ELSE drop THEN
LOOP-LIST ;
 
2 cells constant RING#
: rings-vec ( u -- a size ; create vector of rings )
here over 1+ 0
DO new-node drop 0 , LOOP
swap RING# * ;
 
: populate-by ( a wid -- )
cell+
LIST
dup I nt>freq RING# * + \ root-node
new-node I , \ new-node
do-link
LOOP-LIST drop ;
 
\ --- Display TOP
: node>nt cell+ @ ;
 
: .ring ( root-node -- )
0 swap
RING
dup 0= IF I node>nt nt>freq . THEN
space I node>nt name>string type
1+
LOOP-RING drop cr ;
 
: .top ( a size n -- )
-rot BOUNDS swap
?DO ( n )
I empty-ring? 0= IF 1- I .ring THEN
dup 0= IF drop UNLOOP EXIT THEN
[ RING# negate ] LITERAL +LOOP drop ;
 
: args>top# ( -- n )
1 arg 2dup 0 0 d<>
IF >float
IF f>d d>s dup 0= IF drop 4 THEN
ELSE 4 THEN
ELSE 2drop 4 THEN ;
 
 
\ --- KEYS behaviour
variable cmpl? cmpl? OFF
2variable cword
here WORD# allot 0 cword 2!
 
current @ KEYS current !
: create
cmpl? @
IF cword [email protected] keycmpl
ELSE parse-name funcmpl THEN ;
 
: constant
cmpl? @
IF cword [email protected] keycmpl
ELSE parse-name funcmpl THEN ;
 
: variable parse-name funcmpl ;
: value parse-name funcmpl ;
: defer parse-name funcmpl ;
 
: ( BEGIN >in @ [char] ) parse nip >in @ rot - =
WHILE refill 0= IF exit THEN REPEAT ;
: \ 10 parse 2drop ;
: \G 10 parse 2drop ;
: S" [char] " parse 2drop ;
: ." [char] " parse 2drop ;
 
: [']
parse-name DEFS search-wordlist IF execute THEN ;
: postpone
parse-name DEFS search-wordlist IF execute THEN ;
 
: ; cmpl? OFF ;
: : warnings OFF
parse-name
cword [email protected] drop WORD# rot umin dup >R MOVE
cword [email protected] drop R> cword 2!
cword [email protected] cmpl? @
IF keycmpl \ `:' inside def. = a defining word
ELSE funcmpl THEN
cmpl? ON
warnings ON
;
current !
 
\ Run, ruuun!
stdin ' run execute-parsing-file DEFS @maxfreq rings-vec over DEFS populate-by args>top# .top bye
 

Self test:

$ 
$ gforth funfreq.fs 10 < funfreq.fs 
7  DEFS funcmpl cmpl?
5  WORD#
4  KEYS keycmpl nt>freq RING#
3  LIST LOOP-LIST new-node node>nt
2  >>fPAD >>kPAD intp run empty-ring? RING LOOP-RING do-link @maxfreq rings-vec populate-by .ring .top args>top#
1  create constant variable value defer ( \ \G S" ." ['] postpone ; :
$ 
$ gforth funfreq.fs < funfreq.fs    
7  DEFS funcmpl cmpl?
5  WORD#
4  KEYS keycmpl nt>freq RING#
3  LIST LOOP-LIST new-node node>nt
$

Go[edit]

Only crude approximation is currently easy in Go. The following parses source code, looks for function call syntax (an expression followed by an argument list) and prints the expression.

package main
 
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
"io/ioutil"
"os"
"sort"
)
 
func main() {
if len(os.Args) != 2 {
fmt.Println("usage ff <go source filename>")
return
}
src, err := ioutil.ReadFile(os.Args[1])
if err != nil {
fmt.Println(err)
return
}
fs := token.NewFileSet()
a, err := parser.ParseFile(fs, os.Args[1], src, 0)
if err != nil {
fmt.Println(err)
return
}
f := fs.File(a.Pos())
m := make(map[string]int)
ast.Inspect(a, func(n ast.Node) bool {
if ce, ok := n.(*ast.CallExpr); ok {
start := f.Offset(ce.Pos())
end := f.Offset(ce.Lparen)
m[string(src[start:end])]++
}
return true
})
cs := make(calls, 0, len(m))
for k, v := range m {
cs = append(cs, &call{k, v})
}
sort.Sort(cs)
for i, c := range cs {
fmt.Printf("%-20s %4d\n", c.expr, c.count)
if i == 9 {
break
}
}
}
 
type call struct {
expr string
count int
}
type calls []*call
 
func (c calls) Len() int { return len(c) }
func (c calls) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
func (c calls) Less(i, j int) bool { return c[i].count > c[j].count }

Output, when run on source code above:

len                     3
fmt.Println             3
f.Offset                2
make                    2
fmt.Printf              1
ioutil.ReadFile         1
a.Pos                   1
string                  1
token.NewFileSet        1
append                  1

J[edit]

The lowest approach taken here makes no effort to classify the primitives as monads nor dyads, nor as verbs, adverbs, nor conjunctions. Did "-" mean "additive inverse" or indicate subtraction? Does ";" raze or link? J is a multi-instruction single data language. Parentheses around a group of verbs form hooks or forks which affect data flow. The simple top10 verb does not find these important constructs. So we shall ignore them for this exercise.

 
IGNORE=: ;:'y(0)1',CR
 
Filter=: (#~`)(`:6)
 
NB. extract tokens from a large body newline terminated of text
roughparse=: ;@(<@;: ::(''"_);._2)
 
NB. count frequencies and get the top x
top=: top=: {. \:[email protected]:((#;{.)/.~)
 
NB. read all installed script (.ijs) files and concatenate them
JSOURCE=: ;fread each 1&[email protected]('.ijs'&E.)@>Filter {."1 dirtree jpath '~install'
 
10 top (roughparse JSOURCE)-.IGNORE
┌─────┬──┐
49591│, │
├─────┼──┤
40473│=:│
├─────┼──┤
35593│; │
├─────┼──┤
34096│=.│
├─────┼──┤
24757│+ │
├─────┼──┤
18726│" │
├─────┼──┤
18564│< │
├─────┼──┤
18446│/ │
├─────┼──┤
16984│> │
├─────┼──┤
14655│@ │
└─────┴──┘
 

LiveCode[edit]

Initially based on Listing all the handlers in a script

function handlerNames pScript
put pScript into pScriptCopy
filter pScript with regex pattern "^(on|function).*"
-- add in the built-in commands & functions
put the commandNames & the functionnames into cmdfunc
repeat for each line builtin in cmdfunc
put 0 into handlers[builtin]
end repeat
 
-- add user defined handlers, remove this section of you do not want your own functions included
repeat with x = 1 to the number of lines of pScript
put word 2 of line x of pScript into handlername
put 0 into handlers[handlername]
end repeat
 
-- count handlers used
repeat with x = 1 to the number of lines of pScriptCopy
repeat for each key k in handlers
if k is among the tokens of line x of pScriptCopy then
add 1 to handlers[k]
end if
end repeat
end repeat
 
combine handlers using cr and space
sort lines of handlers descending by word 2 of each
put line 1 to 10 of handlers into handlers
return handlers
end handlerNames
To use
put handlerNames(the script of this stack & cr & the script of this card & cr & the script of me)
Sample output
if 8
put 8
return 8
function 7
factorialacc 4 -- user def function for other rosetta task
factorialr 3 -- user def function for other rosetta task
handlerNames 3
factorial 2 -- user def function for other rosetta task
factorialit 2 -- user def function for other rosetta task
mouseUp 2

Mathematica / Wolfram Language[edit]

programCount[fn_] :=  Reverse[If[Length[#] > 10, Take[#, -10], #] &[SortBy[Tally[Cases[DownValues[fn], s_Symbol, \[Infinity], Heads -> True]], Last]]]
Output:
The output of applying this program to itself...
programCount[programCount]
{{Slot, 3}, {Pattern, 2}, {fn, 2}, {Blank, 2}, {\[Infinity], 1}, {True, 1}, {Tally, 1}, {Take, 1}, {Symbol, 1}, {SortBy, 1}}

Perl[edit]

We leverage the PPI::Tokenizer module.

use PPI::Tokenizer;
my $Tokenizer = PPI::Tokenizer->new( '/path/to/your/script.pl' );
my %counts;
while (my $token = $Tokenizer->get_token) {
# We consider all Perl identifiers. The following regex is close enough.
if ($token =~ /\A[\$\@\%*[:alpha:]]/) {
$counts{$token}++;
}
}
my @desc_by_occurrence =
sort {$counts{$b} <=> $counts{$a} || $a cmp $b}
keys(%counts);
my @top_ten_by_occurrence = @desc_by_occurrence[0 .. 9];
foreach my $token (@top_ten_by_occurrence) {
print $counts{$token}, "\t", $token, "\n";
}
Output:

When run on itself:

6       $token
6       my
4       $counts
2       $Tokenizer
2       $a
2       $b
2       %counts
2       @desc_by_occurrence
2       @top_ten_by_occurrence
2       PPI::Tokenizer

Perl 6[edit]

Here we just examine the ast of the Perl 6 compiler (which is written in Perl 6) to look for function calls.

my $text = qqx[perl6 --target=ast @*ARGS[]];
my %fun;
for $text.lines {
%fun{$0}++ if / '(call &' (.*?) ')' /
}
 
for %fun.invert.sort.reverse[^10] { .value.say }
Output:

Here we run it on the strand sort RC entry. Note how Perl 6 considers various operators to really be function calls underneath.

$ ./morefun strand
pop
postcircumfix:<[ ]>
unshift
succeed
splice
prefix:<->
push
infix:<,>
infix:<..>
infix:<->

PicoLisp[edit]

(let Freq NIL
(for "L" (filter pair (extract getd (all)))
(for "F"
(filter atom
(fish '((X) (or (circ? X) (getd X)))
"L" ) )
(accu 'Freq "F" 1) ) )
(for X (head 10 (flip (by cdr sort Freq)))
(tab (-7 4) (car X) (cdr X)) ) )

Output, for the system in debug mode plus the above code:

quote   310
car     236
cdr     181
setq    148
let     136
if      127
and     124
cons    110
cadr     80
or       76

If the condition in the 5th line (getd X) is replaced with (sym? X), then all symbols are counted, and the output is

X       566
quote   310
car     236
cdr     181
C       160
N       157
L       155
Lst     152
setq    148
T       144

And if it is replaced with (num? X), it is

1        71
0        38
2        27
3        17
7         9
-1        9
100       8
48        6
43        6
12        6

Python[edit]

Works with: Python version 3.x

This code parses a Python source file using the built-in ast module and counts simple function calls; it won't process method calls or cases when you call the result of an expression. Also, since constructors are invoked by calling the class, constructor calls are counted as well.

import ast
 
class CallCountingVisitor(ast.NodeVisitor):
 
def __init__(self):
self.calls = {}
 
def visit_Call(self, node):
if isinstance(node.func, ast.Name):
fun_name = node.func.id
call_count = self.calls.get(fun_name, 0)
self.calls[fun_name] = call_count + 1
self.generic_visit(node)
 
filename = input('Enter a filename to parse: ')
with open(filename, encoding='utf-8') as f:
contents = f.read()
root = ast.parse(contents, filename=filename) #NOTE: this will throw a SyntaxError if the file isn't valid Python code
visitor = CallCountingVisitor()
visitor.visit(root)
top10 = sorted(visitor.calls.items(), key=lambda x: x[1], reverse=True)[:10]
for name, count in top10:
print(name,'called',count,'times')
 

The result of running the program on the ftplib module of Python 3.2:

Enter a filename to parse: c:\Python32\Lib\ftplib.py
error_reply called 10 times
print called 10 times
error_proto called 8 times
callback called 8 times
int called 7 times
repr called 7 times
isinstance called 6 times
len called 6 times
ValueError called 3 times
parse257 called 2 times

Racket[edit]

 
#lang racket
(require math)
(define in (open-input-file "function-frequency.rkt"))
(void (read-language in))
(define s-exprs (for/list ([s (in-port read in)]) s))
(define symbols (filter symbol? (flatten s-exprs)))
(define counts (sort (hash->list (samples->hash symbols)) >= #:key cdr))
(take counts (min 10 (length counts)))
 

Output:

 
'((define . 4)
(counts . 3)
(s-exprs . 2)
(s . 2)
(symbols . 2)
(a-program . 2)
(filter . 1)
(hash->list . 1)
(in-port . 1)
(sort . 1))
 


REXX[edit]

version 1[edit]

This program counts statically. It lacks, however, treatment of comments and literal strings.

fid='pgm.rex'
cnt.=0
funl=''
Do While lines(fid)>0
l=linein(fid)
Do Until p=0
p=pos('(',l)
If p>0 Then Do
do i=p-1 To 1 By -1 While is_tc(substr(l,i,1))
End
fn=substr(l,i+1,p-i-1)
If fn<>'' Then
Call store fn
l=substr(l,p+1)
End
End
End
Do While funl<>''
Parse Var funl fn funl
Say right(cnt.fn,3) fn
End
Exit
x=a(3)+bbbbb(5,c(555))
special=date('S') 'DATE'() "date"()
is_tc:
abc='abcdefghijklmnopqrstuvwxyz'
Return pos(arg(1),abc||translate(abc)'1234567890_''"')>0
 
store:
Parse Arg fun
cnt.fun=cnt.fun+1
If cnt.fun=1 Then
funl=funl fun
Return
Output:
  1 lines
  1 linein
  2 pos
  1 '
  1 is_tc
  3 substr
  1 right
  1 a
  1 bbbbb
  1 c
  1 date
  1 'DATE'
  1 "date"
  1 arg
  1 translate

version 2[edit]

This program counts statically. Contents of comments and literal strings are not analyzed. Neither are function invocations via CALL.

/* REXX ****************************************** Version 11.12.2015 **
* Rexx Tokenizer to find function invocations
*-----------------------------------------------------------------------
* Tokenization remembers the following for each token
* t.i text of token
* t.i.0t type of token: Cx/V/K/N/O/S/L
* comment/variable/keyword/constant/operator/string/label
* t.i.0il line of token in the input
* t.i.0ic col of token in the input
* t.i.0prev index of token starting previous instruction
* t.i.0ol line of token in the output
* t.i.0oc col of token in the output
*---------------------------------------------------------------------*/

Call time 'R'
Parse Upper Arg fid '(' options
If fid='?' Then Do
Say 'Tokenike a REXX proram and list the function invocations found'
Say ' which are of the form symbol(... or ''string''(...'
Say ' (the left parenthesis must immediately follow the symbol'
Say ' or literal string.)'
Say 'Syntax:'
Say ' TKZ pgm < ( <Debug> <Tokens> >'
Exit
End
g.=0
Call init /* Initialize constants etc. */
g.0cont='01'x
g.0breakc='02'x
cnt.=0
Call readin /* Read input file into l.* */
Call tokenize /* Tokenize the input */
tk=''
Call process_tokens
g.0fun_list=wordsort(g.0fun_list)
Do While g.0fun_list>''
Parse Var g.0fun_list fun g.0fun_list
Say right(cnt.fun,3) fun
End
Say time('E') 'seconds elapsed for' t.0 'tokens in' g.0lines 'lines.'
Exit
 
init:
/***********************************************************************
* Initialize constants etc.
***********************************************************************/

g.=''
g.0debug=0 /* set debug off by default */
 
fid=strip(fid)
If fid='' Then /* no file specified */
Exit exit(12 'no input file specified')
Parse Var fid fn '.'
 
os=options /* options specified on command */
g.0debug=0 /* turn off debug output */
g.0tokens=0 /* No token file */
Do While os<>'' /* process them individually */
Parse Upper Var os o os /* pick one */
Select
When abbrev('DEBUG',o,1) Then /* Debug specified */
g.0debug=1 /* turn on debug output */
When abbrev('TOKENS',o,1) Then /* Write a file with tokens */
g.0tokens=1
Otherwise /* anything else */
Say 'Unknown option:' o /* tell the user and ignore it */
End
End
 
If g.0debug Then Do
g.0dbg=fn'.dbg'; '@erase' g.0dbg
End
If g.0tokens Then Do
g.0tkf=fn'.tok'; '@erase' g.0tkf
End
 
/***********************************************************************
* Language specifics
***********************************************************************/

g.0special='+-*/%''";:<>^\=|,()& '/* special characters */
/* chars that may start a var */
g.0a='abcdefghijklmnopqrstuvwxyz'||,
'[email protected]#$!?_'
g.0n='1234567890' /* numeric characters */
g.0vc=g.0a||g.0n||'.' /* var-character */
/* multi-character operators */
g.0opx='&& ** // << <<= <= <> == >< >= >> >>=',
'^< ^<< ^= ^== ^> ^>> \< \<< \= \== \> \>> ||'
 
t.='' /* token list */
Return
 
readin:
/***********************************************************************
* Read the file to be formatted
***********************************************************************/

lc=''
i=0
g.0lines=0
Do While lines(fid)<>0
li=linein(fid)
g.0lines=g.0lines+1
If i>0 Then
lc=strip(l.i,'T')
If right(lc,1)=',' Then Do
l.i=left(lc,length(lc)-1) li
End
Else Do
i=i+1
l.i=li
End
End
l.0=i
Call lineout fid
t=l.0+1
l.t=g.0eof /* add a stopper at program end */
l.0=t /* adjust number of lines */
g.0il=t /* remember end of program */
Return
 
tokenize:
/***********************************************************************
* First perform tokenization
* Input: l.* Program text
* Output: t.* Token list
* t.0t.i token type CA CB CC C comment begin/middle/end
* S string
* O operator (special character)
* V variable symbol
* N constant
* X end of text
* Note: special characters are treated as separate tokens
***********************************************************************/

li=0 /* line index */
ti=0 /* token index */
Do While li<l.0 /* as long as there is more input */
li=li+1 /* index of next line */
l=l.li /* next line to be processed */
g.0newline=1
g.0cc=0 /* current column */
Call dsp l.li /* debug output */
If l='' Then /* empty line */
Call addtoken '/*--*/','C' /* preserve with special token */
Do While l<>'' /* work through the line */
nbc=verify(l,' ') /* first non-blank column */
g.0cc=g.0cc+nbc /* advance to this */
If g.0newline='' Then Do
If t.ti.0ic='' Then
t.ti.0ic=0
If g.0cc=t.ti.0ic+length(t.ti) Then Do
tj=ti+1
t.tj.0ad=1
End
End
l=substr(l,nbc) /* and continue with rest of line */
Parse Var l c +1 l 1 c2 +2 /* get character(s) */
g.0tb=g.0cc /* remember where token starts */
Select /* take a decision */
When c2='/*' Then /* comment starts here */
Call comment /* process comment */
When pos(c,'''"')>0 Then /* literal string starts here */
Call string c /* process literal string */
Otherwise /* neither comment nor literal */
Call token /* get other token */
End /* cmt, string, or token done */
End /* end of loop over line */
End /* end of loop over program */
t.0=ti /* store number of tokens */
Call dsp ti 'tokens' l.0 'lines'
Return
comment:
/***********************************************************************
* Parse a comment
* Nested comments are supported
***********************************************************************/

cbeg=t.ti.0il
l=substr(l,2) /* continue after slash-asterisk */
g.0cc=g.0cc+1 /* update current char position */
t='/*' /* token so far */
incmt=1 /* indicate "within a comment" */
Do Until incmt=0 /* loop until done */
bc=pos('/*',l) /* next begin comment, if any */
ec=pos('*/',l) /* next end comment, if any */
Select /* decide */
When bc>0 &, /* begin-comment found */
(ec=0 | bc<ec) Then Do /* and no end-comment or later */
t=t||left(l,bc+1) /* add this all to token */
incmt=incmt+1 /* increment comment nest-depth */
l=substr(l,bc+2) /* continue after slash-asterisk */
g.0cc=g.0cc+bc+1 /* update current char position */
End
When ec>0 Then Do /* end-comment found */
t=t||left(l,ec+1) /* add all to token */
incmt=incmt-1 /* decrement nesting */
l=substr(l,ec+2) /* continue after asterisk-slash */
g.0cc=g.0cc+ec+1 /* update current char position */
End
Otherwise Do /* no further comment bracket */
Call addtoken t||l,ct() /* rest of line to token */
li=li+1 /* proceed to next line */
l=l.li /* contents of next line */
g.0newline=1
If l=g.0eof Then Do
Say 'Comment started in line' cbeg 'is not closed before EOF'
Exit err(58)
End
g.0cc=0 /* current char (none) */
g.0tb=1 /* token (comment) starts here */
End
End
End
Call addtoken t,ct() /* last (or only) comment token */
If pos('*debug*',t)>0 Then g.0debug=1
Return
 
ct:
/***********************************************************************
* Comment type
***********************************************************************/

If incmt>0 Then Do /* within a comment */
If t.ti.0t='CA' |, /* prev. token was start or cont */
t.ti.0t='CB' Then Return 'CB' /* this is continuation */
Else Return 'CA' /* this is start */
End
Else Do /* comment is over */
If t.ti.0t='CA' |, /* prev. token was start or cont */
t.ti.0t='CB' Then Return 'CC' /* this is final part */
Else Return 'C' /* this is just a comment */
End
string:
/***********************************************************************
* Parse a string
* take care of '111'B and '123'X
***********************************************************************/

Parse Arg delim /* string delimiter found */
t=delim /* star building the token */
instr=1 /* note we are within a string */
g.0ss=li
Do Until instr=0 /* continue until it is over */
se=pos(delim,l) /* ending delimiter */
If se>0 Then Do /* found */
If substr(l,se+1,1)=delim Then Do /* but it is doubled */
t=t||left(l,se+1) /* so add all so far to token */
l=substr(l,se+2) /* and take rest of line */
g.0cc=g.0cc+se+1 /* and set current character pos */
End
Else Do /* not another one */
instr=0 /* string is done */
t=t||left(l,se) /* add the string data to token */
l=substr(l,se+1) /* take the rest of the line */
g.0cc=g.0cc+se /* and set current character pos */
If pos(translate(left(l,1)),'BX')>0 Then
If pos(substr(l,2,1),g.0vc)=0 Then Do
t=t||left(l,1) /* add the char to the token */
l=substr(l,2) /* take the rest of the line */
g.0cc=g.0cc+1 /* and set current character pos */
End
End
End
Else Do /* not found */
Call addtoken t||l,'S' /* store the token */
g.0lasttoken='' /* reset this switch */
li=li+1 /* go on to the next line */
If li>l.0 Then /* there is no next line */
Exit err(60,'string starting in line' g.0ss,
'does not end before end of file')
Else
Say 'string starting at line' g.0ss 'extended over line boundary'
l=l.li /* take contents of the next line */
g.0cc=1 /* current char position */
g.0tb=1 /* ?? */
End
End
Call addtoken t,'S' /* store the token */
Return
token:
/***********************************************************************
* Parse a token
***********************************************************************/

IF c=g.0comma & l='' Then Do
t=g.0cont
type='O' /* O (for operator - not quite...)*/
End
Else Do
If pos(c,g.0special)>0 Then Do /* a special character */
t=c /* take it as is */
type='O' /* O (for operator - not quite...)*/
End
Else Do /* some other character */
nsp=verify(l,g.0special,'M') /* find delimiting character */
If nsp>0 Then Do /* some character found */
t=c||left(l,nsp-1) /* take all up to this character */
l=substr(l,nsp) /* and continue from there */
End
Else Do /* none found */
t=c||l /* add rest of line to token */
l='' /* and all is used up */
End
g.0cc=g.0cc+length(t)-1 /* adjust current char position */
If pos(right(t,1),'eE')>0 &, /* consider nxxxE+nn case */
pos(left(l,1),'+-')>0 Then Do
If pos(left(t,1),'.1234567890')>0 Then /* start . or digit */
If pos(substr(l,2,1),'1234567890')>0 Then Do /* dig after+- */
nsp=verify(substr(l,2),g.0special,'M')+1 /* find end */
If nsp>1 Then /* delimiting character found */
exp=substr(l,2,nsp-2) /* exponent (if numeric) */
Else
exp=substr(l,2)
If verify(exp,'0123456789')=0 Then Do
t=t||left(l,1)||exp
l=substr(l,length(exp)+2)
g.0cc=g.0cc+length(exp)+2
End
End
End
Select
When isvar(t) Then /* token qualifies as variable */
type='V'
When isconst(t) Then /* token is a constant symbol */
type='N'
When t=g.0eof Then /* token is end of file indication*/
type='X'
Otherwise Do /* anything else is an error */
Say 'li='li
Say l
Say 'token error'
Trace ?R
Exit err(62,'token' t 'is neither variable nor constant')
End
End
If left(l,1)='(' Then
type=type||'F'
End
End
Call addtoken t,type /* store the token */
Return
addtoken:
/***********************************************************************
* Add a token to the token list
***********************************************************************/

Parse Arg t,type /* token and its type */
If type='O' Then Do /* operator (special character) */
If pos(t,'><=&|/*')>0 Then Do /* char for composite operator */
If wordpos(t.ti||t,g.0opx)>0 Then Do /* composite operator */
t.ti=t.ti||t /* use concatenation */
/* does not handle =/**/= */
t='' /* we are done */
Return
End
End
End
 
If type='CC' & t='*/' Then Do /* The special case for SPA */
Return
End
 
ti=ti+1 /* increment index */
t.ti=t /* store token's value */
t.ti.0t=left(type,1) /* and its type */
t.ti.0nl=g.0newline /* token starts a new line */
g.0newline='' /* reset new line switch */
If t.ti.0t='C' Then Do
t.ti.0t=type
If left(t.ti,3)='/* ' &,
right(t.ti,3)=' */' Then
t.ti='/*' strip(substr(t.ti,4,length(t.ti)-6)) '*/'
End
t.ti.0f=substr(type,2,1) /* 'F' if possibly a function */
Call setpos ti li g.0tb /* and its position */
If left(type,1)='C' Then /* ??? */
If left(t.ti,2)<>'/*' Then Do
ts=strip(t.ti,'L')
t.ti.0oc=t.ti.0oc+length(t.ti)-length(ts)
t.ti=ts
End
If t.ti.0ol='' Then t.ti.0ol=li
If t.ti.0oc='' Then t.ti.0oc=0
t.ti.0il=t.ti.0ol /* and its position */
t.ti.0ic=t.ti.0oc /* and its position */
Call dsp ti t.ti t.ti.0il'/'t.ti.0ic '->' t.ti.0ol'/'t.ti.0oc
t='' /* reset token variable */
Return
 
lookback:
/***********************************************************************
* Look back if...
***********************************************************************/

Do i_=ti To 1 By -1
Select
When left(t.i_.0t,1)='C' Then Nop
When t.i_.0used<>1 &,
(t.i_=g.0comma |,
t.i_=g.0cont) Then Do
t.i_.0used=1
t.i_=g.0cont
Return '0'
End
Otherwise
Return '1'
End
End
Return '1'
 
isvar:
/***********************************************************************
* Determine if a string qualifies as variable name
***********************************************************************/

Parse Arg a_ +1 b_
res=(pos(a_,g.0a)>0) &,
(verify(b_,g.0a||g.0n||'.')=0)
Return res
 
isconst:
/***********************************************************************
* Determine if a string qualifies as constant
***********************************************************************/

Parse Arg a_
res=(verify(a_,g.0a||g.0n||'.+-')=0) /* ??? */
Return res
 
setpos:
Parse Arg seti sol soc
setz='setpos:' t.seti t.seti.0ol'/'t.seti.0oc '-->',
sol'/'soc '('sigl')'
Call dsp setz
t.seti.0ol=sol
t.seti.0oc=soc
Return
 
process_tokens:
/***********************************************************************
* Process the token list
***********************************************************************/

Do i=1 To t.0
If g.0tokens Then
Call lineout g.0tkf,right(i,4) right(t.i.0il,3)'.'left(t.i.0ic,3),
right(t.i.0ol,3)'.'left(t.i.0oc,3),
left(t.i.0t,2) left(t.i,25)
If t.i='(' Then Do
j=i-1
If t.j.0ol=t.i.0il & ,
t.j.0oc+length(t.j)=t.i.0ic &,
pos(t.j.0t,'VS')>0 Then
Call store_f t.j
End
End
If g.0tokens Then
Call lineout g.0tkf
Return
 
store_f:
Parse Arg funct
If wordpos(funct,g.0fun_list)=0 then
g.0fun_list=g.0fun_list funct
cnt.funct=cnt.funct+1
Return
 
dsp:
/***********************************************************************
* Record (and display) a debug line
***********************************************************************/

Parse Arg ol_.1
If g.0debug>0 Then
Call lineout g.0dbg,ol_.1
If g.0debug>1 Then
Say ol_.1
Return
 
wordsort: Procedure
/**********************************************************************
* Sort the list of words supplied as argument. Return the sorted list
**********************************************************************/

Parse Arg wl
wa.=''
wa.0=0
Do While wl<>''
Parse Var wl w wl
Do i=1 To wa.0
If wa.i>w Then Leave
End
If i<=wa.0 Then Do
Do j=wa.0 To i By -1
ii=j+1
wa.ii=wa.j
End
End
wa.i=w
wa.0=wa.0+1
End
swl=''
Do i=1 To wa.0
swl=swl wa.i
End
Return strip(swl)
 
err:
/***********************************************************************
* Diagnostic error exit
***********************************************************************/

Parse Arg errnum, errtxt
Say 'err:' errnum errtxt
If t.ti.0il>g.0il Then
Say 'Error' arg(1) 'at end of file'
Else Do
Say 'Error' arg(1) 'around line' t.ti.0il', column' t.ti.0ic
_=t.ti.0il
Say l._
Say copies(' ',t.ti.0ic-1)'|'
End
If errtxt<>'' Then Say ' 'errtxt
Exit 12
Output:

Result for the above program.

  2 abbrev
  2 arg
  1 copies
  2 ct
  3 err
  1 exit
  1 isconst
  1 isvar
 21 left
  9 length
  1 linein
  1 lines
 15 pos
  7 right
  5 strip
 17 substr
  1 time
  1 translate
  6 verify
  2 wordpos
  1 wordsort
0.093000 seconds elapsed for 2200 tokens in 510 lines.

Sidef[edit]

Sidef provides full access to its parser, allowing us to inspect all the declarations within a program.

func foo { }
func bar { }
 
foo(); foo(); foo()
bar(); bar();
 
var data = Perl.to_sidef(Parser{:vars}{:main}).flatten
 
data.sort_by { |v| -v{:count} }.first(10).each { |entry|
if (entry{:type} == :func) {
say ("Function `#{entry{:name}}` (declared at line",
" #{entry{:line}}) is used #{entry{:count}} times")
}
}
Output:
Function `foo` (declared at line 1) is used 3 times
Function `bar` (declared at line 2) is used 2 times

Tcl[edit]

package require Tcl 8.6
 
proc examine {filename} {
global cmds
set RE "(?:^|\[\[\{\])\[\\w:.\]+"
set f [open $filename]
while {[gets $f line] >= 0} {
set line [string trim $line]
if {$line eq "" || [string match "#*" $line]} {
continue
}
foreach cmd [regexp -all -inline $RE $line] {
incr cmds([string trim $cmd "\{\["])
}
}
close $f
}
 
# Parse each file on the command line
foreach filename $argv {
examine $filename
}
# Get the command list in order of frequency
set cmdinfo [lsort -stride 2 -index 1 -integer -decreasing [array get cmds]]
# Print the top 10 (two list items per entry, so 0-19, not 0-9)
foreach {cmd count} [lrange $cmdinfo 0 19] {
puts [format "%-20s%d" $cmd $count]
}

Sample run (note that the commands found are all standard Tcl commands; they're just commands so it is natural to expect them to be found):

bash$ tclsh8.6 RosettaCode/cmdfreq.tcl RosettaCode/*.tcl 
set                 2374
expr                846
if                  775
puts                558
return              553
proc                549
incr                485
foreach             432
lindex              406
lappend             351