Implement #if and #elif with expression evaluation

.coveragerc

@@ -1,6 +1,10 @@
 [run]
 branch = True
+relative_files = True
 omit =
    simplecpreprocessor/__init__.py
    simplecpreprocessor/__main__.py
    simplecpreprocessor/tests/*.py
+
+[xml]
+output = coverage.xml

.github/workflows/ci-build.yml

@@ -35,25 +35,18 @@ jobs:
           flake8 simplecpreprocessor
 
   test:
-    name: Test with coverage
+    name: Run tests
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4.1.7
 
       - uses: ./.github/actions/prepare-build
 
       - run: |
-          py.test -v --cov=simplecpreprocessor --cov-config .coveragerc --cov-report=xml --cov-report=term-missing
-
-      - name: Upload coverage artifact
-        uses: actions/upload-artifact@v4.3.3
-        with:
-          name: coverage
-          path: coverage.xml
+          py.test -v
 
   upload-coverage:
-    name: Publish coverage report
-    needs: test
+    name: Test with coverage and publish report
     # Disabled for fork PR's as we can't use OIDC there
     if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name == github.repository
     runs-on: ubuntu-latest
@@ -63,9 +56,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4.1.7
 
-      - uses: actions/download-artifact@v4.1.8
-        with:
-          name: coverage
+      - uses: ./.github/actions/prepare-build
+
+      - name: Run tests with coverage
+        run: |
+          py.test -v --cov=simplecpreprocessor --cov-config .coveragerc --cov-report=xml --cov-report=term-missing
 
       - name: Upload to Codecov via OIDC
         uses: codecov/codecov-action@v5.5.0

.gitignore

@@ -1,5 +1,6 @@
 *.pyc
 .coverage
+coverage.xml
 dist
 htmlcov
 .venv

CONTRIBUTING.md

@@ -42,10 +42,12 @@ All contributions must pass linting with no errors.
 Run tests with coverage (matches CI):
 
 ```bash
- py.test -v --cov=simplecpreprocessor --cov-config .coveragerc --cov-report=term-missing
+py.test -v --cov=simplecpreprocessor --cov-config .coveragerc --cov-report=xml --cov-report=term-missing
 ```
 
-Coverage must remain at or above the current threshold. Coverage reports are generated automatically in CI.
+This generates both a terminal report and an XML report (`coverage.xml`) that codecov uses.
+
+Coverage must remain at or above the current threshold. Coverage reports are generated automatically in CI and uploaded to codecov.
 
 ## Pull requests
 

README.md

@@ -14,9 +14,18 @@ behaviour.
 Gotchas
 ---------
 
-Supported macros: ifdef, ifndef, define, undef, include, else,
+Supported macros: ifdef, ifndef, if, elif, define, undef, include, else,
 pragma (only "once")
 
+The #if and #elif directives support constant expression evaluation including:
+ * Integer constants
+ * Arithmetic operators: +, -, *, /, %
+ * Comparison operators: ==, !=, <, >, <=, >=
+ * Logical operators: &&, ||, !
+ * Bitwise operators: &, |, ^
+ * The defined() operator (with or without parentheses)
+ * Parentheses for grouping
+
 If using for FFI, you may want to ignore some system headers eg for types
 
 Limitations:

codecov.yml

@@ -0,0 +1,28 @@
+codecov:
+  require_ci_to_pass: true
+
+coverage:
+  precision: 2
+  round: down
+  range: "90...100"
+
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 0.5%
+    patch:
+      default:
+        target: auto
+        threshold: 0.5%
+
+ignore:
+  - "simplecpreprocessor/__init__.py"
+  - "simplecpreprocessor/__main__.py"
+  - "simplecpreprocessor/tests"
+  - "simplecpreprocessor/tests/*.py"
+
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: false