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authorJohn Mark Bell <jmb@netsurf-browser.org>2009-06-19 10:44:47 +0000
committerJohn Mark Bell <jmb@netsurf-browser.org>2009-06-19 10:44:47 +0000
commitcc4d98bb8bf6177c523e0fbbc0b8385891528198 (patch)
tree0822ad09ef5d6a2759d718019529d24beeb8f4b1 /src/parse/properties
parent2a4f3b8fc1e09fa982d3fc9cf97451b5ad1ca04d (diff)
downloadlibcss-cc4d98bb8bf6177c523e0fbbc0b8385891528198.tar.gz
libcss-cc4d98bb8bf6177c523e0fbbc0b8385891528198.tar.bz2
Parse background shorthand property
svn path=/trunk/libcss/; revision=7874
Diffstat (limited to 'src/parse/properties')
-rw-r--r--src/parse/properties/background.c229
-rw-r--r--src/parse/properties/properties.c1
-rw-r--r--src/parse/properties/properties.h3
3 files changed, 233 insertions, 0 deletions
diff --git a/src/parse/properties/background.c b/src/parse/properties/background.c
index d769d73..0afef30 100644
--- a/src/parse/properties/background.c
+++ b/src/parse/properties/background.c
@@ -14,6 +14,235 @@
#include "parse/properties/utils.h"
/**
+ * Parse background
+ *
+ * \param c Parsing context
+ * \param vector Vector of tokens to process
+ * \param ctx Pointer to vector iteration context
+ * \param result Pointer to location to receive resulting style
+ * \return CSS_OK on success,
+ * CSS_NOMEM on memory exhaustion,
+ * CSS_INVALID if the input is not a valid background-attachment
+ *
+ * Post condition: \a *ctx is updated with the next token to process
+ * If the input is invalid, then \a *ctx remains unchanged.
+ */
+css_error parse_background(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style **result)
+{
+ int orig_ctx = *ctx;
+ int prev_ctx;
+ const css_token *token;
+ css_style *attachment = NULL;
+ css_style *color = NULL;
+ css_style *image = NULL;
+ css_style *position = NULL;
+ css_style *repeat = NULL;
+ css_style *ret = NULL;
+ uint32_t required_size;
+ css_error error;
+
+ /* Firstly, handle inherit */
+ token = parserutils_vector_peek(vector, *ctx);
+ if (token != NULL && token->type == CSS_TOKEN_IDENT &&
+ token->ilower == c->strings[INHERIT]) {
+ uint32_t *bytecode;
+
+ error = css_stylesheet_style_create(c->sheet,
+ 5 * sizeof(uint32_t), &ret);
+ if (error != CSS_OK) {
+ *ctx = orig_ctx;
+ return error;
+ }
+
+ bytecode = (uint32_t *) ret->bytecode;
+
+ *(bytecode++) = buildOPV(CSS_PROP_BACKGROUND_ATTACHMENT,
+ FLAG_INHERIT, 0);
+ *(bytecode++) = buildOPV(CSS_PROP_BACKGROUND_COLOR,
+ FLAG_INHERIT, 0);
+ *(bytecode++) = buildOPV(CSS_PROP_BACKGROUND_IMAGE,
+ FLAG_INHERIT, 0);
+ *(bytecode++) = buildOPV(CSS_PROP_BACKGROUND_POSITION,
+ FLAG_INHERIT, 0);
+ *(bytecode++) = buildOPV(CSS_PROP_BACKGROUND_REPEAT,
+ FLAG_INHERIT, 0);
+
+ parserutils_vector_iterate(vector, ctx);
+
+ *result = ret;
+
+ return CSS_OK;
+ } else if (token == NULL) {
+ /* No tokens -- clearly garbage */
+ *ctx = orig_ctx;
+ return CSS_INVALID;
+ }
+
+ /* Attempt to parse the various longhand properties */
+ do {
+ prev_ctx = *ctx;
+ error = CSS_OK;
+
+ /* Try each property parser in turn, but only if we
+ * haven't already got a value for this property.
+ * To achieve this, we end up with a bunch of empty
+ * if/else statements. Perhaps there's a clearer way
+ * of expressing this. */
+ if (attachment == NULL &&
+ (error = parse_background_attachment(c, vector,
+ ctx, &attachment)) == CSS_OK) {
+ } else if (color == NULL &&
+ (error = parse_background_color(c, vector, ctx,
+ &color)) == CSS_OK) {
+ } else if (image == NULL &&
+ (error = parse_background_image(c, vector, ctx,
+ &image)) == CSS_OK) {
+ } else if (position == NULL &&
+ (error = parse_background_position(c, vector,
+ ctx, &position)) == CSS_OK) {
+ } else if (repeat == NULL &&
+ (error = parse_background_repeat(c, vector,
+ ctx, &repeat)) == CSS_OK) {
+ }
+
+ if (error == CSS_OK) {
+ consumeWhitespace(vector, ctx);
+
+ token = parserutils_vector_peek(vector, *ctx);
+ } else {
+ /* Forcibly cause loop to exit */
+ token = NULL;
+ }
+ } while (*ctx != prev_ctx && token != NULL);
+
+ /* Calculate the required size of the resultant style,
+ * defaulting the unspecified properties to their initial values */
+ required_size = 0;
+
+ if (attachment)
+ required_size += attachment->length;
+ else
+ required_size += sizeof(uint32_t);
+
+ if (color)
+ required_size += color->length;
+ else
+ required_size += sizeof(uint32_t);
+
+ if (image)
+ required_size += image->length;
+ else
+ required_size += sizeof(uint32_t);
+
+ if (position)
+ required_size += position->length;
+ else
+ required_size += sizeof(uint32_t); /* Use top left, not 0% 0% */
+
+ if (repeat)
+ required_size += repeat->length;
+ else
+ required_size += sizeof(uint32_t);
+
+ /* Create and populate it */
+ error = css_stylesheet_style_create(c->sheet, required_size, &ret);
+ if (error != CSS_OK)
+ goto cleanup;
+
+ required_size = 0;
+
+ if (attachment) {
+ memcpy(((uint8_t *) ret->bytecode) + required_size,
+ attachment->bytecode, attachment->length);
+ required_size += attachment->length;
+ } else {
+ void *bc = ((uint8_t *) ret->bytecode) + required_size;
+
+ *((uint32_t *) bc) = buildOPV(CSS_PROP_BACKGROUND_ATTACHMENT,
+ 0, BACKGROUND_ATTACHMENT_SCROLL);
+ required_size += sizeof(uint32_t);
+ }
+
+ if (color) {
+ memcpy(((uint8_t *) ret->bytecode) + required_size,
+ color->bytecode, color->length);
+ required_size += color->length;
+ } else {
+ void *bc = ((uint8_t *) ret->bytecode) + required_size;
+
+ *((uint32_t *) bc) = buildOPV(CSS_PROP_BACKGROUND_COLOR,
+ 0, BACKGROUND_COLOR_TRANSPARENT);
+ required_size += sizeof(uint32_t);
+ }
+
+ if (image) {
+ memcpy(((uint8_t *) ret->bytecode) + required_size,
+ image->bytecode, image->length);
+ required_size += image->length;
+ } else {
+ void *bc = ((uint8_t *) ret->bytecode) + required_size;
+
+ *((uint32_t *) bc) = buildOPV(CSS_PROP_BACKGROUND_IMAGE,
+ 0, BACKGROUND_IMAGE_NONE);
+ required_size += sizeof(uint32_t);
+ }
+
+ if (position) {
+ memcpy(((uint8_t *) ret->bytecode) + required_size,
+ position->bytecode, position->length);
+ required_size += position->length;
+ } else {
+ void *bc = ((uint8_t *) ret->bytecode) + required_size;
+
+ *((uint32_t *) bc) = buildOPV(CSS_PROP_BACKGROUND_POSITION,
+ 0, BACKGROUND_POSITION_HORZ_LEFT |
+ BACKGROUND_POSITION_VERT_TOP);
+ required_size += sizeof(uint32_t);
+ }
+
+ if (repeat) {
+ memcpy(((uint8_t *) ret->bytecode) + required_size,
+ repeat->bytecode, repeat->length);
+ required_size += repeat->length;
+ } else {
+ void *bc = ((uint8_t *) ret->bytecode) + required_size;
+
+ *((uint32_t *) bc) = buildOPV(CSS_PROP_BACKGROUND_REPEAT,
+ 0, BACKGROUND_REPEAT_REPEAT);
+ required_size += sizeof(uint32_t);
+ }
+
+ assert(required_size == ret->length);
+
+ /* Write the result */
+ *result = ret;
+ /* Invalidate ret, so that cleanup doesn't destroy it */
+ ret = NULL;
+
+ /* Clean up after ourselves */
+cleanup:
+ if (attachment)
+ css_stylesheet_style_destroy(c->sheet, attachment);
+ if (color)
+ css_stylesheet_style_destroy(c->sheet, color);
+ if (image)
+ css_stylesheet_style_destroy(c->sheet, image);
+ if (position)
+ css_stylesheet_style_destroy(c->sheet, position);
+ if (repeat)
+ css_stylesheet_style_destroy(c->sheet, repeat);
+ if (ret)
+ css_stylesheet_style_destroy(c->sheet, ret);
+
+ if (error != CSS_OK)
+ *ctx = orig_ctx;
+
+ return error;
+}
+
+/**
* Parse background-attachment
*
* \param c Parsing context
diff --git a/src/parse/properties/properties.c b/src/parse/properties/properties.c
index a0edd29..8da730d 100644
--- a/src/parse/properties/properties.c
+++ b/src/parse/properties/properties.c
@@ -13,6 +13,7 @@
const css_prop_handler property_handlers[LAST_PROP + 1 - FIRST_PROP] =
{
parse_azimuth,
+ parse_background,
parse_background_attachment,
parse_background_color,
parse_background_image,
diff --git a/src/parse/properties/properties.h b/src/parse/properties/properties.h
index 496d3dc..a41f2c9 100644
--- a/src/parse/properties/properties.h
+++ b/src/parse/properties/properties.h
@@ -25,6 +25,9 @@ extern const css_prop_handler property_handlers[LAST_PROP + 1 - FIRST_PROP];
css_error parse_azimuth(css_language *c,
const parserutils_vector *vector, int *ctx,
css_style **result);
+css_error parse_background(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style **result);
css_error parse_background_attachment(css_language *c,
const parserutils_vector *vector, int *ctx,
css_style **result);