workflows: add check for generated AT Parser

Adds check for generated AT Parser lexer to determine
if it's up to date according to the regex source.

Signed-off-by: Mirko Covizzi <mirko.covizzi@nordicsemi.no>

.github/workflows/check-generated-at-parser.yml

@@ -0,0 +1,42 @@
+name: Check Generated AT Parser
+
+on:
+ pull_request:
+ paths:
+ - 'lib/at_parser/at_match.re'
+
+jobs:
+ check-generated-at-parser:
+ runs-on: ubuntu-latest
+ name: Check Generated AT Parser
+ steps:
+ - name: Update PATH for west
+ run: |
+ echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+ - name: Checkout sources
+ uses: actions/checkout@v4
+ with:
+ ref: ${{ github.event.pull_request.head.sha }}
+ path: ncs/nrf
+ fetch-depth: 0
+ persist-credentials: false
+
+ - name: Install dependencies
+ run: |
+ sudo apt-get install re2c=3.0-1
+
+ - name: Generate lexer
+ working-directory: ncs/nrf/lib/at_parser
+ run: |
+ re2c at_match.re -o at_match.c -W --tags --no-debug-info --no-generation-date --no-version
+
+ - name: Compare lexers
+ working-directory: ncs/nrf/lib/at_parser
+ run: |
+ if diff -q at_match.c generated/at_match.c > /dev/null; then
+ echo "Lexer is up to date."
+ else
+ echo "Lexer is not up to date. Please re-generate the lexer and update the PR."
+ exit 1
+ fi