Provide WebAssembly using clang or emscripten 2 make decoding runnable in a browser

CMakeLists.txt

@@ -34,4 +34,8 @@ IF (WITH_PYTHON_MODULE)
   add_subdirectory(source/python)
 ENDIF()
 
+IF (WITH_WASM_MODULE)
+  add_subdirectory(source/wasm)
+ENDIF()
+
 add_subdirectory(source/test)

conanfile.py

@@ -18,6 +18,7 @@ class TicketDecoderConan(ConanFile):
                "with_ticket_analyzer": [True, False],
                "with_ticket_decoder": [True, False],
                "with_python_module": [True, False],
+               "with_wasm_module": [True, False],
                "with_square_detector": [True, False],
                "with_classifier_detector": [True, False],
                "with_barcode_decoder": [True, False],
@@ -35,6 +36,7 @@ class TicketDecoderConan(ConanFile):
                "with_ticket_analyzer": True,
                "with_ticket_decoder": True,
                "with_python_module": True,
+               "with_wasm_module": True,
                "with_square_detector": True,
                "with_classifier_detector": True,
                "with_barcode_decoder": True,
@@ -94,10 +96,13 @@ def requirements(self):
       self.requires("libpng/1.6.58", override=True)
 
    def build_requirements(self):
-      # https://conan.io/center/recipes/cmake
-      self.tool_requires("cmake/[>=3.22]")
+      if not self.options.with_wasm_module: # this fails when using emsdk and seems not required there
+         # https://conan.io/center/recipes/cmake
+         self.tool_requires("cmake/[>=3.22]")
+
       #https://conan.io/center/recipes/ninja
       self.tool_requires("ninja/[>=1.13]")
+
       # https://conan.io/center/recipes/gtest
       self.test_requires("gtest/1.17.0")
 
@@ -113,6 +118,9 @@ def generate(self):
       if self.options.with_python_module:
          TicketDecoderConan.add_config_switch(toolchain, "WITH_PYTHON_MODULE")
 
+      if self.options.with_wasm_module:
+         TicketDecoderConan.add_config_switch(toolchain, "WITH_WASM_MODULE")
+
       if self.options.with_square_detector:
          TicketDecoderConan.add_config_switch(toolchain, "WITH_SQUARE_DETECTOR")
 
@@ -144,6 +152,7 @@ def configure(self):
       self.output.highlight("with_ticket_analyzer: " + str(self.options.with_ticket_analyzer))
       self.output.highlight("with_ticket_decoder: " + str(self.options.with_ticket_decoder))
       self.output.highlight("with_python_module: " + str(self.options.with_python_module))
+      self.output.highlight("with_wasm_module: " + str(self.options.with_wasm_module))
       self.output.highlight("with_square_detector: " + str(self.options.with_square_detector))
       self.output.highlight("with_classifier_detector: " + str(self.options.with_classifier_detector))
       self.output.highlight("with_barcode_decoder: " + str(self.options.with_barcode_decoder))

etc/conan/profiles/emscripten

@@ -0,0 +1,10 @@
+[settings]
+os=Emscripten
+arch=wasm64
+compiler=clang
+compiler.version=16
+compiler.libcxx=libc++
+compiler.cppstd=20
+
+[tool_requires]
+emsdk/3.1.73

etc/poppler/conanfile.py

@@ -30,6 +30,7 @@ class PopplerCppConan(ConanFile):
         "with_ticket_analyzer": None,
         "with_ticket_decoder": None,
         "with_python_module": None,
+        "with_wasm_module": None,
         "with_square_detector": None,
         "with_classifier_detector": None,
         "with_barcode_decoder": None,
@@ -73,6 +74,7 @@ def configure(self):
         self.options.rm_safe("with_ticket_analyzer")
         self.options.rm_safe("with_ticket_decoder")
         self.options.rm_safe("with_python_module")
+        self.options.rm_safe("with_wasm_module")
         self.options.rm_safe("with_square_detector")
         self.options.rm_safe("with_classifier_detector")
         self.options.rm_safe("with_barcode_decoder")

pyproject.toml

@@ -66,6 +66,7 @@ options-all = [
     "&:with_ticket_analyzer=False",
     "&:with_ticket_decoder=False",
     "&:with_python_module=True",
+    "&:with_wasm_module=False",
     "&:with_square_detector=False",
     "&:with_classifier_detector=False",
     "&:with_barcode_decoder=True",

setup.All.sh

@@ -12,6 +12,7 @@ ${WORKSPACE_ROOT}/etc/conan-install.sh ${BUILD_TYPE} \
     -o:a="&:with_ticket_analyzer=True" \
     -o:a="&:with_ticket_decoder=True" \
     -o:a="&:with_python_module=True" \
+    -o:a="&:with_wasm_module=False" \
     -o:a="&:with_square_detector=True" \
     -o:a="&:with_classifier_detector=True" \
     -o:a="&:with_barcode_decoder=True" \

setup.Decoder.sh

@@ -12,6 +12,7 @@ ${WORKSPACE_ROOT}/etc/conan-install.sh ${BUILD_TYPE} \
     -o:a="&:with_ticket_analyzer=False" \
     -o:a="&:with_ticket_decoder=True" \
     -o:a="&:with_python_module=False" \
+    -o:a="&:with_wasm_module=False" \
     -o:a="&:with_square_detector=False" \
     -o:a="&:with_classifier_detector=False" \
     -o:a="&:with_barcode_decoder=True" \

setup.WASM.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# SPDX-FileCopyrightText: (C) 2022 user4223 and (other) contributors to ticket-decoder <https://github.com/user4223/ticket-decoder>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+set -o errexit
+
+readonly WORKSPACE_ROOT="$(readlink -f $(dirname "$0"))"
+readonly BUILD_TYPE=${1:-Release}
+
+${WORKSPACE_ROOT}/etc/conan-config.sh
+${WORKSPACE_ROOT}/etc/conan-install.sh ${BUILD_TYPE} \
+    -o:a="&:with_ticket_analyzer=False" \
+    -o:a="&:with_ticket_decoder=False" \
+    -o:a="&:with_python_module=False" \
+    -o:a="&:with_wasm_module=True" \
+    -o:a="&:with_square_detector=False" \
+    -o:a="&:with_classifier_detector=False" \
+    -o:a="&:with_barcode_decoder=True" \
+    -o:a="&:with_pdf_input=True" \
+    -o:a="&:with_signature_verifier=True" \
+    -o:a="&:with_uic_interpreter=True" \
+    -o:a="&:with_vdv_interpreter=True" \
+    -o:a="&:with_sbb_interpreter=True" \
+    -pr:h="./etc/conan/profiles/emscripten"
+
+${WORKSPACE_ROOT}/etc/cmake-config.sh ${BUILD_TYPE}
+${WORKSPACE_ROOT}/build.sh ${BUILD_TYPE} ${@:2}

source/app/CMakeLists.txt

@@ -1,7 +1,7 @@
 # SPDX-FileCopyrightText: (C) 2022 user4223 and (other) contributors to ticket-decoder <https://github.com/user4223/ticket-decoder>
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-project(ticket-decoder)
+project(ticket-decoder-app)
 
 find_package(tclap REQUIRED)
 

source/wasm/CMakeLists.txt

@@ -0,0 +1,11 @@
+# SPDX-FileCopyrightText: (C) 2026 user4223 and (other) contributors to ticket-decoder <https://github.com/user4223/ticket-decoder>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+PROJECT(ticket-decoder)
+
+AUX_SOURCE_DIRECTORY("source" PROJECT_SOURCE)
+file(GLOB PROJECT_INCLUDES "include/*.h")
+
+ADD_LIBRARY(${PROJECT_NAME} STATIC ${PROJECT_SOURCE} ${PROJECT_INCLUDES})
+target_include_directories(${PROJECT_NAME} PRIVATE)
+target_link_libraries(${PROJECT_NAME} PRIVATE)

source/wasm/source/Binding.cpp

@@ -0,0 +1,10 @@
+// SPDX-FileCopyrightText: (C) 2026 user4223 and (other) contributors to ticket-decoder <https://github.com/user4223/ticket-decoder>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifdef __EMSCRIPTEN__
+
+EMSCRIPTEN_BINDINGS(TicketDecoder) {
+
+};
+
+#endif