added clay-xml with xmllib2 that reads in an xml file

with test.xml as input it produces the same output as clay-demo (except for different order of properties in the debug print)

CMakeLists.txt

@@ -11,6 +11,12 @@ FetchContent_Declare(
         GIT_TAG        c3b672634f0635af1ad0ffa8c15b34fc7c1035cf # 1.17.8
 )
 
+FetchContent_Declare(
+        libxml2
+        GIT_REPOSITORY https://gitlab.gnome.org/GNOME/libxml2.git
+        GIT_TAG f507d167f1755b7eaea09fb1a44d29aab828b6d1
+)
+
 #FetchContent_MakeAvailable(cairo)
 
 
@@ -35,4 +41,10 @@ target_compile_options(clay PRIVATE -Wall -Werror)
 if (PROJECT_IS_TOP_LEVEL)
     add_executable(clay-demo src/clay-demo/demo.c)
     target_link_libraries(clay-demo PRIVATE clay)
+
+    FetchContent_MakeAvailable(libxml2)
+    add_executable(clay-xml src/clay-xml/main.c)
+    target_link_libraries(clay-xml PRIVATE clay)
+    target_link_libraries(clay-xml PRIVATE LibXml2)
+
 endif ()

src/clay-xml/main.c

@@ -0,0 +1,71 @@
+#include <libxml/tree.h>
+#include <assert.h>
+#include <stdbool.h>
+#include "clay.h"
+
+
+clay make_clay_from_xml(clay_ctx, xmlNodePtr);
+
+int main(int argc, char **argv) {
+    assert(argc == 2);
+    const char * input_file_name = argv[1];
+
+    xmlDocPtr doc;
+    xmlNodePtr cur;
+    doc = xmlParseFile(input_file_name);
+    assert(doc != NULL);
+
+    xmlNodePtr rootNode = xmlDocGetRootElement(doc);
+    assert(rootNode != NULL);
+    assert(xmlStrcmp(rootNode->name, (const xmlChar *) "clay") == 0);
+
+    cur = rootNode->children;
+    xmlNodePtr documentNode = NULL;
+    while(cur != NULL) {
+        if (cur->type == XML_ELEMENT_NODE) {
+            assert(documentNode == NULL);
+            assert(xmlStrcmp(cur->name, (const xmlChar *) "document") == 0);
+            documentNode = cur;
+        }
+        cur = cur->next;
+    }
+    assert(documentNode != NULL);
+
+    clay_ctx ctx = clay_create_context();
+
+    clay document_element = make_clay_from_xml(ctx, documentNode);
+
+    xmlFreeDoc(doc);
+
+    clay_print_layout_tree(document_element);
+
+    clay_destroy_context(ctx);
+}
+
+
+clay make_clay_from_xml(clay_ctx ctx, xmlNodePtr xml_node) {
+    clay layout = clay_create(ctx, (const char *)xml_node->name);
+    xmlAttrPtr attribute = xml_node->properties;
+    while (attribute != NULL) {
+        const char * key = (const char *) attribute->name;
+        char * value = (char *) xmlNodeListGetString(xml_node->doc, attribute->children, 1);
+        clay_set(layout, key, value);
+        attribute = attribute->next;
+    }
+
+    xmlNodePtr child = xml_node->children;
+    bool has_element_children = false;
+    while(child != NULL) {
+        if (child->type == XML_ELEMENT_NODE) {
+            clay child_layout = make_clay_from_xml(ctx, child);
+            clay_append_child(layout, child_layout);
+            has_element_children = true;
+        }
+        child = child->next;
+    }
+    if (!has_element_children) {
+        clay_set(layout, "text", (char*) xml_node->children->content);
+    }
+
+    return layout;
+}

test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<clay>
+    <document width="800" height="400" background-color="#cef9f2ff">
+        <flex direction="row" wrap="wrap" align-items="stretch" align-content="stretch" gap="20" padding="20">
+            <text background-color="#04E76280" width="100" flex-grow="1" flex-shrink="1" align="center" vertical-align="middle">ITEM 1</text>
+            <text background-color="#22312780" width="300" flex-grow="1" flex-shrink="1" align="center" vertical-align="middle">ITEM 2</text>
+            <text background-color="#DC007380" width="200" flex-grow="1" flex-shrink="1" align="center" vertical-align="middle">ITEM 3</text>
+            <text background-color="#008BF880" width="400" flex-grow="1" flex-shrink="1" align="center" vertical-align="middle">ITEM 4</text>
+            <text background-color="#47006380" width="250" flex-grow="1" flex-shrink="1" align="center" vertical-align="middle">ITEM 5</text>
+        </flex>
+    </document>
+</clay>