improve the matching script

util/find_func_calls.py

@@ -7,23 +7,50 @@
 #  compilation option specific, so it's better to find them from source
 #  files.
 #
+#  Example run:
+#
+#    $ python util/find_func_calls.py src/*.c src/*.h | \
+#      grep -v -i -P ^duk_ | grep -v -P '^(sizeof|va_start|va_end|va_arg)' | \
+#      sort | uniq | less
+#
 
 import os
 import sys
 import re
 
+re_linecont = re.compile(r'\\\n')
 re_comment = re.compile(r'/\*.*?\*/', re.DOTALL)
-re_func_call = re.compile(r'([A-Za-z_][A-Za-z0-9_]+)\(', re.MULTILINE)
+re_func_call = re.compile(r'([A-Za-z_][A-Za-z0-9_]+)\(')
+re_string = re.compile(r'"(\\"|[^"])*"')
+
+def stripLineContinuations(x):
+	res = re.sub(re_linecont, ' ', x)
+	#print(res)
+	return res
 
-def stripComments(d):
-	res = re.sub(re_comment, '/*omit*/', d)
+def stripComments(x):
+	res = re.sub(re_comment, '/*omit*/', x)
 	#print(res)
 	return res
 
-def findFuncCalls(d):
+def stripStrings(x):
+	res = re.sub(re_string, '"..."', x)
+	#print(res)
+	return res
+
+def findFuncCalls(d, fn):
 	res = []
-	for m in re_func_call.finditer(d):
-		res.append(m.group(1))
+	for line in d.split('\n'):
+		if len(line) >= 1 and line[0] == '#':
+			# Preprocessor lines contain function call like
+			# syntax but are not function calls.
+			continue
+
+		for m in re_func_call.finditer(line):
+			res.append({
+				'name': m.group(1),
+				'filename': fn
+			})
 	return res
 
 def main():
@@ -36,14 +63,18 @@ def main():
 		d = f.read()
 		f.close()
 
-		# Strip block comments.
+		# Strip line continuations, comments, and strings so that
+		# we minimize false matches.
 
+		d = stripLineContinuations(d)
 		d = stripComments(d)
+		d = stripStrings(d)
 
 		# Find function calls (close enough).
 
-		for i in findFuncCalls(d):
-			print(i)
+		for i in findFuncCalls(d, fn):
+			#print '%s' % i['name']
+			print '%-25s%s' % (i['name'], i['filename'])
 
 if __name__ == '__main__':
 	main()