🔨 added filter script for branch coverage

test/CMakeLists.txt

@@ -41,10 +41,12 @@ if(JSON_Coverage)
     find_program(GCOV_BIN NAMES gcov-${GCC_VERSION} gcov HINTS ${COMPILER_PATH})
 
     # add target to collect coverage information and generate HTML file
+    # (filter script from https://stackoverflow.com/a/43726240/266378)
     add_custom_target(lcov_html
         COMMAND lcov --directory . --capture --output-file json.info --gcov-tool ${GCOV_BIN} --rc lcov_branch_coverage=1
         COMMAND lcov -e json.info ${CMAKE_SOURCE_DIR}/src/json.hpp --output-file json.info.filtered --rc lcov_branch_coverage=1
-        COMMAND genhtml --title "JSON for Modern C++" --legend --demangle-cpp --output-directory html --show-details --branch-coverage json.info.filtered
+        COMMAND ${CMAKE_SOURCE_DIR}/test/thirdparty/imapdl/filterbr.py json.info.filtered > json.info.filtered.noexcept
+        COMMAND genhtml --title "JSON for Modern C++" --legend --demangle-cpp --output-directory html --show-details --branch-coverage json.info.filtered.noexcept
         COMMENT "Generating HTML report test/html/index.html"
     )
 endif()

test/thirdparty/imapdl/filterbr.py

+#!/usr/bin/env python3
+
+# 2017, Georg Sauthoff <mail@gms.tf>, GPLv3
+
+import sys
+
+def skip_comments(lines):
+  state = 0
+  for line in lines:
+    n = len(line)
+    l = ''
+    p = 0
+    while p < n:
+      if state == 0:
+        a = line.find('//', p)
+        b = line.find('/*', p)
+        if a > -1 and (a < b or b == -1):
+          l += line[p:a]
+          p = n
+        elif b > -1 and (b < a or a == -1):
+          l += line[p:b]
+          p = b+2
+          state = 1
+        else:
+          l += line[p:]
+          p = n
+      elif state == 1:
+        a = line.rfind('*/', p)
+        if a == -1:
+          p = n
+        else:
+          p = a + 2
+          state = 0
+    yield l
+
+def cond_lines(lines):
+  state = 0
+  pcnt = 0
+  for nr, line in enumerate(lines, 1):
+    if not line:
+      continue
+    n = len(line)
+    p = 0
+    do_yield = False
+    while p < n:
+      if state == 0:
+        p = line.find('if', p)
+        if p == -1:
+          p = n
+          continue
+        if (p == 0 or not line[p-1].isalpha()) \
+            and (p+2 == len(line) or not line[p+2].isalpha()):
+          do_yield = True
+          state = 1
+        p += 2
+      elif state == 1:
+        do_yield = True
+        p = line.find('(', p)
+        if p == -1:
+          p = n
+        else:
+          p += 1
+          state = 2
+          pcnt = 1
+      elif state == 2:
+        do_yield = True
+        for p in range(p, n):
+          if line[p] == '(':
+            pcnt += 1
+          elif line[p] == ')':
+            pcnt -= 1
+          if not pcnt:
+            state = 0
+            break
+        p += 1
+    if do_yield:
+      yield nr
+
+def cond_lines_from_file(filename):
+  with open(filename) as f:
+    yield from cond_lines(skip_comments(f))
+
+def filter_lcov_trace(lines):
+  nrs = set()
+  for line in lines:
+    if line.startswith('SF:'):
+      nrs = set(cond_lines_from_file(line[3:-1]))
+    elif line.startswith('BRDA:'):
+      xs = line[5:].split(',')
+      nr = int(xs[0]) if xs else 0
+      if nr not in nrs:
+        continue
+    yield line
+
+def filter_lcov_trace_file(s_filename, d_file):
+  with open(s_filename) as f:
+    for l in filter_lcov_trace(f):
+      print(l, end='', file=d_file)
+
+if __name__ == '__main__':
+  #for l in cond_lines_from_file(sys.argv[1]):
+  #  print(l)
+
+  filter_lcov_trace_file(sys.argv[1], sys.stdout)
+
+  #with open(sys.argv[1]) as f:
+  #  for l in skip_comments(f):
+  #    print(l)
+