1 files changed, 426 insertions, 0 deletions
diff --git a/src/styleengine.cc b/src/styleengine.cc
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index 00000000..bd5c60ed
--- /dev/null
+++ b/src/styleengine.cc
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+/*
+ * File: styleengine.cc
+ *
+ * Copyright 2008 Jorge Arellano Cid <jcid@dillo.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <math.h>
+#include "../dlib/dlib.h"
+#include "styleengine.hh"
+
+using namespace dw::core::style;
+
+StyleEngine::StyleEngine (dw::core::Layout *layout) {
+   StyleAttrs style_attrs;
+   FontAttrs font_attrs;
+
+   stack = new lout::misc::SimpleVector <Node> (1);
+   cssContext = new CssContext ();
+   this->layout = layout;
+
+   stack->increase ();
+   Node *n =  stack->getRef (stack->size () - 1);
+
+   /* Create a dummy font, attribute, and tag for the bottom of the stack. */
+   font_attrs.name = "helvetica";
+   font_attrs.size = 12;
+   font_attrs.weight = 400;
+   font_attrs.style = FONT_STYLE_NORMAL;
+ 
+   style_attrs.initValues ();
+   style_attrs.font = Font::create (layout, &font_attrs);
+   style_attrs.color = Color::create (layout, 0);
+   style_attrs.backgroundColor = Color::create (layout, 0xffffff);
+   
+   n->style = Style::create (layout, &style_attrs);
+   n->wordStyle = NULL;
+   n->pseudo = NULL;
+   n->styleAttribute = NULL;
+   n->inheritBackgroundColor = false;
+}
+
+StyleEngine::~StyleEngine () {
+   /* \todo clear stack if not empty */
+   delete stack;
+   delete cssContext;
+}
+
+/**
+ * \brief tell the styleEngine that a new html element has started.
+ */
+void StyleEngine::startElement (int element) {
+//   fprintf(stderr, "===> START %d\n", element);
+
+   if (stack->getRef (stack->size () - 1)->style == NULL)
+      style0 ();
+
+   stack->increase ();
+   Node *n =  stack->getRef (stack->size () - 1);
+   n->style = NULL;
+   n->wordStyle = NULL;
+   n->depth = stack->size () - 1;
+   n->element = element;
+   n->id = NULL;
+   n->klass = NULL;
+   n->pseudo = NULL;
+   n->styleAttribute = NULL;
+   n->inheritBackgroundColor = false;
+}
+
+void StyleEngine::setId (const char *id) {
+   Node *n =  stack->getRef (stack->size () - 1);
+   assert (n->id == NULL);
+   n->id = dStrdup (id);
+};
+
+void StyleEngine::setClass (const char *klass) {
+   Node *n =  stack->getRef (stack->size () - 1);
+   assert (n->klass == NULL);
+   n->klass = dStrdup (klass);
+};
+
+void StyleEngine::setStyle (const char *style) {
+   Node *n =  stack->getRef (stack->size () - 1);
+   assert (n->styleAttribute == NULL);
+   n->styleAttribute = dStrdup (style);
+};
+
+/**
+ * \brief set properties that were definded using (mostly deprecated) HTML
+ *    attributes (e.g. bgColor).
+ */
+void StyleEngine::setNonCssHints (CssPropertyList *nonCssHints) {
+   if (stack->getRef (stack->size () - 1)->style)
+      stack->getRef (stack->size () - 1)->style->unref ();
+   style0 (nonCssHints); // evaluate now, so caller can free nonCssHints
+}
+
+/**
+ * \brief Use of the background color of the parent style as default.
+ *   This is only used in table code to allow for colors specified for
+ *   table rows as table rows are currently no widgets and therefore
+ *   don't draw any background.
+ */
+void StyleEngine::inheritBackgroundColor () {
+   stack->getRef (stack->size () - 1)->inheritBackgroundColor = true;
+}
+
+/**
+ * \brief set the CSS pseudo class :link.
+ */
+void StyleEngine::setPseudoLink () {
+   Node *n =  stack->getRef (stack->size () - 1);
+   n->pseudo = "link";
+}
+
+/**
+ * \brief set the CSS pseudo class :visited.
+ */
+void StyleEngine::setPseudoVisited () {
+   Node *n =  stack->getRef (stack->size () - 1);
+   n->pseudo = "visited";
+}
+
+/**
+ * \brief tell the styleEngine that a html element has ended.
+ */
+void StyleEngine::endElement (int element) {
+//   fprintf(stderr, "===> END %d\n", element);
+   assert (stack->size () > 1);
+   assert (element == stack->getRef (stack->size () - 1)->element);
+
+   Node *n =  stack->getRef (stack->size () - 1);
+
+   if (n->style)
+      n->style->unref ();
+   if (n->wordStyle)
+      n->wordStyle->unref ();
+   if (n->id)
+      dFree ((void*) n->id); 
+   if (n->klass)
+      dFree ((void*) n->klass); 
+   if (n->styleAttribute)
+      dFree ((void*) n->styleAttribute); 
+
+   stack->setSize (stack->size () - 1);
+}
+
+/**
+ * \brief Make changes to StyleAttrs attrs according to CssPropertyList props.
+ */
+void StyleEngine::apply (StyleAttrs *attrs, CssPropertyList *props) {
+   FontAttrs fontAttrs = *attrs->font;
+   Font *parentFont;
+
+   /* Determine font first so it can be used to resolve relative lenths.
+    * \todo Things should be rearranged so that just one pass is necessary.
+    */
+   for (int i = 0; i < props->size (); i++) {
+      CssProperty *p = props->getRef (i);
+      
+      switch (p->name) {
+         case CssProperty::CSS_PROPERTY_FONT_FAMILY:
+            fontAttrs.name = p->value.strVal;
+            break;
+         case CssProperty::CSS_PROPERTY_FONT_SIZE:
+            parentFont = stack->get (stack->size () - 2).style->font;
+            computeValue (&fontAttrs.size, p->value.intVal, parentFont,
+               parentFont->size);
+            break;
+         case CssProperty::CSS_PROPERTY_FONT_STYLE:
+            fontAttrs.style = (FontStyle) p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_FONT_WEIGHT:
+            switch (p->value.intVal) {
+               case CssProperty::CSS_FONT_WEIGHT_LIGHTER:
+                  fontAttrs.weight -= CssProperty::CSS_FONT_WEIGHT_STEP;
+                  break;
+               case CssProperty::CSS_FONT_WEIGHT_BOLDER:
+                  fontAttrs.weight += CssProperty::CSS_FONT_WEIGHT_STEP;
+                  break;
+               default:
+                  fontAttrs.weight = p->value.intVal;
+                  break;
+            }
+            if (fontAttrs.weight < CssProperty::CSS_FONT_WEIGHT_MIN)
+               fontAttrs.weight = CssProperty::CSS_FONT_WEIGHT_MIN;
+            if (fontAttrs.weight > CssProperty::CSS_FONT_WEIGHT_MAX)
+               fontAttrs.weight = CssProperty::CSS_FONT_WEIGHT_MAX;
+            break;
+         default:
+            break;
+      }
+   }
+
+   attrs->font = Font::create (layout, &fontAttrs);
+
+   for (int i = 0; i < props->size (); i++) {
+      CssProperty *p = props->getRef (i);
+      
+      switch (p->name) {
+         /* \todo missing cases */
+         case CssProperty::CSS_PROPERTY_BACKGROUND_COLOR:
+            attrs->backgroundColor =
+               Color::create (layout, p->value.intVal);
+            break; 
+         case CssProperty::CSS_PROPERTY_BORDER_TOP_COLOR:
+            attrs->borderColor.top =
+              Color::create (layout, p->value.intVal);
+            break; 
+         case CssProperty::CSS_PROPERTY_BORDER_BOTTOM_COLOR:
+            attrs->borderColor.bottom =
+              Color::create (layout, p->value.intVal);
+            break; 
+         case CssProperty::CSS_PROPERTY_BORDER_LEFT_COLOR:
+            attrs->borderColor.left =
+              Color::create (layout, p->value.intVal);
+            break; 
+         case CssProperty::CSS_PROPERTY_BORDER_RIGHT_COLOR:
+            attrs->borderColor.right =
+              Color::create (layout, p->value.intVal);
+            break; 
+         case CssProperty::CSS_PROPERTY_BORDER_BOTTOM_STYLE:
+            attrs->borderStyle.bottom = (BorderStyle) p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_BORDER_LEFT_STYLE:
+            attrs->borderStyle.left = (BorderStyle) p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_BORDER_RIGHT_STYLE:
+            attrs->borderStyle.right = (BorderStyle) p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_BORDER_TOP_STYLE:
+            attrs->borderStyle.top = (BorderStyle) p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_BORDER_BOTTOM_WIDTH:
+            computeValue (&attrs->borderWidth.bottom, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_BORDER_LEFT_WIDTH:
+            computeValue (&attrs->borderWidth.left, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_BORDER_RIGHT_WIDTH:
+            computeValue (&attrs->borderWidth.right, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_BORDER_TOP_WIDTH:
+            computeValue (&attrs->borderWidth.top, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_BORDER_SPACING:
+            computeValue (&attrs->hBorderSpacing, p->value.intVal, attrs->font);
+            computeValue (&attrs->vBorderSpacing, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_COLOR:
+            attrs->color = Color::create (layout, p->value.intVal);
+            break; 
+         case CssProperty::CSS_PROPERTY_CURSOR:
+            attrs->cursor = (Cursor) p->value.intVal;
+            break; 
+         case CssProperty::CSS_PROPERTY_LIST_STYLE_TYPE:
+            attrs->listStyleType = (ListStyleType) p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_MARGIN_BOTTOM:
+            computeValue (&attrs->margin.bottom, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_MARGIN_LEFT:
+            computeValue (&attrs->margin.left, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_MARGIN_RIGHT:
+            computeValue (&attrs->margin.right, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_MARGIN_TOP:
+            computeValue (&attrs->margin.top, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_PADDING_TOP:
+            computeValue (&attrs->padding.top, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_PADDING_BOTTOM:
+            computeValue (&attrs->padding.bottom, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_PADDING_LEFT:
+            computeValue (&attrs->padding.left, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_PADDING_RIGHT:
+            computeValue (&attrs->padding.right, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_TEXT_ALIGN:
+            attrs->textAlign = (TextAlignType) p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_TEXT_DECORATION:
+            attrs->textDecoration |= p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_VERTICAL_ALIGN:
+            attrs->valign = (VAlignType) p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_WHITE_SPACE:
+            attrs->whiteSpace = (WhiteSpace) p->value.intVal;
+            break;
+         case CssProperty::CSS_PROPERTY_WIDTH:
+            computeLength (&attrs->width, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::CSS_PROPERTY_HEIGHT:
+            computeLength (&attrs->height, p->value.intVal, attrs->font);
+            break;
+         case CssProperty::PROPERTY_X_LINK:
+            attrs->x_link = p->value.intVal;
+            break;
+         case CssProperty::PROPERTY_X_IMG:
+            attrs->x_img = p->value.intVal;
+            break;
+
+         default:
+            break;
+      }
+   }
+
+   /* make sure border colors are set */
+   if (attrs->borderColor.top == NULL) 
+      attrs->borderColor.top = attrs->color;
+   if (attrs->borderColor.bottom == NULL) 
+      attrs->borderColor.bottom = attrs->color;
+   if (attrs->borderColor.left == NULL) 
+      attrs->borderColor.left = attrs->color;
+   if (attrs->borderColor.right == NULL) 
+      attrs->borderColor.right = attrs->color;
+   
+}
+
+/**
+ * \brief Resolve relative lengths to absolute values.
+ */
+bool StyleEngine::computeValue (int *dest, CssLength value, Font *font) {
+   static float dpmm;
+
+   if (dpmm == 0.0)
+      dpmm = layout->dpiX () / 25.4; /* assume dpiX == dpiY */
+
+   switch (CSS_LENGTH_TYPE (value)) {
+      case CSS_LENGTH_TYPE_PX:
+         *dest = (int) CSS_LENGTH_VALUE (value);
+         return true;
+      case CSS_LENGTH_TYPE_MM:
+         *dest = (int) (CSS_LENGTH_VALUE (value) * dpmm + 0.5);
+        return true;
+      case CSS_LENGTH_TYPE_EM:
+         *dest = (int) (CSS_LENGTH_VALUE (value) * font->size + 0.5);
+        return true;
+      case CSS_LENGTH_TYPE_EX:
+         *dest = (int) (CSS_LENGTH_VALUE(value) * font->xHeight + 0.5);
+        return true;
+      default:
+         break;
+   }
+
+   return false;
+}
+
+bool StyleEngine::computeValue (int *dest, CssLength value, Font *font,
+                                int percentageBase) {
+   if (CSS_LENGTH_TYPE (value) == CSS_LENGTH_TYPE_PERCENTAGE) {
+      *dest = (int) (CSS_LENGTH_VALUE (value) * percentageBase + 0.5);
+      return true;
+   } else
+      return computeValue (dest, value, font);
+}
+
+bool StyleEngine::computeLength (dw::core::style::Length *dest,
+                                 CssLength value, Font *font) {
+   int v;
+
+   if (CSS_LENGTH_TYPE (value) == CSS_LENGTH_TYPE_PERCENTAGE) {
+      *dest = createPerLength (CSS_LENGTH_VALUE (value));
+      return true;
+    } else if (computeValue (&v, value, font)) {
+       *dest = createAbsLength (v);
+       return true;
+    }
+
+   return false;
+}
+
+/**
+ * \brief Create a new style object based on the previously opened / closed
+ *    HTML elements and the nonCssProperties that have been set.
+ *    This method is private. Call style() to get a current style object.
+ */
+Style * StyleEngine::style0 (CssPropertyList *nonCssProperties) {
+   CssPropertyList props;
+   CssPropertyList *tagStyleProps = NULL; /** \todo implementation */
+
+   // get previous style from the stack
+   StyleAttrs attrs = *stack->getRef (stack->size () - 2)->style;
+   // reset values that are not inherited according to CSS
+   attrs.resetValues ();
+
+   if (stack->getRef (stack->size () - 2)->inheritBackgroundColor)
+      attrs.backgroundColor =
+         stack->getRef (stack->size () - 2)->style->backgroundColor;
+  
+   cssContext->apply (&props, this, tagStyleProps, nonCssProperties);
+
+   apply (&attrs, &props);
+
+   stack->getRef (stack->size () - 1)->style = Style::create (layout, &attrs);
+   
+   return stack->getRef (stack->size () - 1)->style;
+}
+
+Style * StyleEngine::wordStyle0 (CssPropertyList *nonCssProperties) {
+   StyleAttrs attrs = *style ();
+   attrs.resetValues ();
+
+   if (stack->getRef (stack->size () - 1)->inheritBackgroundColor)
+      attrs.backgroundColor = style ()->backgroundColor;
+
+   stack->getRef (stack->size () - 1)->wordStyle = Style::create (layout, &attrs);
+   return stack->getRef (stack->size () - 1)->wordStyle;
+}
+
+void StyleEngine::parse (const char *buf, int buflen,
+                         int order_count, CssOrigin origin) {
+
+   a_Css_parse (cssContext, buf, buflen, order_count, origin);
+}