split the absolute loop to make main axis work

src/Layout.js

@@ -412,14 +412,12 @@ var computeLayout = (function() {
     for (var/*int*/ i = 0; i < node.children.length; ++i) {
       var/*css_node_t**/ child = node.children[i];
 
+      var/*bool*/ leadingPos = isPosDefined(child, leading[mainAxis]);
+      var/*bool*/ trailingPos = isPosDefined(child, trailing[mainAxis]);
+
       if (getPositionType(child) === CSS_POSITION_ABSOLUTE &&
-          isPosDefined(child, leading[mainAxis])) {
+          (leadingPos || trailingPos)) {
-        // In case the child is position absolute and has left/top being
+        // see the loop afterwards
-        // defined, we override the position to whatever the user said
-        // (and margin/border).
-        child.layout[pos[mainAxis]] = getPosition(child, leading[mainAxis]) +
-          getBorder(node, leading[mainAxis]) +
-          getMargin(child, leading[mainAxis]);
       } else {
         // If the child is position absolute (without top/left) or relative,
         // we put it at the current accumulated offset.
@@ -461,6 +459,39 @@ var computeLayout = (function() {
       );
     }
 
+    for (var/*int*/ i = 0; i < node.children.length; ++i) {
+      var/*css_node_t**/ child = node.children[i];
+
+      var/*bool*/ leadingPos = isPosDefined(child, leading[mainAxis]);
+      var/*bool*/ trailingPos = isPosDefined(child, trailing[mainAxis]);
+
+      if (getPositionType(child) === CSS_POSITION_ABSOLUTE &&
+          (leadingPos || trailingPos)) {
+        // In case the child is absolutely positionned and has a
+        // top/left/bottom/right being set, we override all the previously
+        // computed positions to set it correctly.
+        if (leadingPos) {
+          child.layout[pos[mainAxis]] =
+            getPosition(child, leading[mainAxis]) +
+            getBorder(node, leading[mainAxis]) +
+            getMargin(child, leading[mainAxis]);
+        }
+        if (!leadingPos && trailingPos) {
+          child.layout[pos[mainAxis]] =
+            node.layout[dim[mainAxis]] -
+            child.layout[dim[mainAxis]] -
+            getMargin(child, trailing[mainAxis]) -
+            getPosition(child, trailing[mainAxis]);
+        }
+        if (leadingPos && trailingPos) {
+          child.layout[dim[mainAxis]] =
+            node.layout[dim[mainAxis]] -
+            child.layout[pos[mainAxis]] -
+            getMargin(child, trailing[mainAxis]) -
+            getPosition(child, trailing[mainAxis]);
+        }
+      }
+    }
 
     // <Loop D> Position elements in the cross axis
 

src/__tests__/Layout-test.js

@@ -939,6 +939,17 @@ describe('Layout', function() {
     );
   });
 
+  it('should layout with position absolute bottom', function() {
+    testLayout(
+      {style: {}, children: [
+        {style: {bottom: 5, paddingTop: 5, position: 'absolute'}}
+      ]},
+      {width: 0, height: 0, top: 0, left: 0, children: [
+        {width: 0, height: 5, top: -10, left: 0}
+      ]}
+    );
+  });
+
   xit('should layout text with alignItems: stretch', function() {
     testLayout(
       {style: {width: 80, padding: 7, alignItems: 'stretch', measure: text('loooooooooong with space')}},
@@ -997,10 +1008,10 @@ describe('Layout', function() {
       var node = {style: {}};
       randMinMax(node, 0.5, 'width', -100, 1000);
       randMinMax(node, 0.5, 'height', -100, 1000);
-      randMinMax(node, 0.5, 'top', -10, 10);
+      randMinMax(node, 0.9, 'top', -10, 10);
-      randMinMax(node, 0.5, 'left', -10, 10);
+      randMinMax(node, 0.9, 'left', -10, 10);
-      randMinMax(node, 0.5, 'right', -10, 10);
+      randMinMax(node, 0.9, 'right', -10, 10);
-      randMinMax(node, 0.5, 'bottom', -10, 10);
+      randMinMax(node, 0.9, 'bottom', -10, 10);
       randSpacing(node, 0.5, 'margin', '', -10, 20);
       randSpacing(node, 0.5, 'padding', '', -10, 20);
       randSpacing(node, 0.5, 'border', 'Width', -4, 4);
@@ -1010,7 +1021,7 @@ describe('Layout', function() {
       randEnum(node, 0.5, 'alignSelf', ['flex-start', 'center', 'flex-end', 'stretch']);
       randEnum(node, 0.5, 'flex', ['none', 1]);
       randEnum(node, 0.5, 'position', ['relative', 'absolute']);
-      randEnum(node, 0.5, 'measure', [text('small'), text('loooooooooong with space')]);
+//      randEnum(node, 0.5, 'measure', [text('small'), text('loooooooooong with space')]);
 
       if (node.style.measure) {
         // align-items: stretch on a text node makes it wrap in a different way.