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-rw-r--r--src/parse/properties/columns.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/src/parse/properties/columns.c b/src/parse/properties/columns.c
new file mode 100644
index 0000000..b245740
--- /dev/null
+++ b/src/parse/properties/columns.c
@@ -0,0 +1,141 @@
+/*
+ * This file is part of LibCSS.
+ * Licensed under the MIT License,
+ * http://www.opensource.org/licenses/mit-license.php
+ * Copyright 2012 Michael Drake <tlsa@netsurf-browser.org>
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include "bytecode/bytecode.h"
+#include "bytecode/opcodes.h"
+#include "parse/properties/properties.h"
+#include "parse/properties/utils.h"
+
+/**
+ * Parse columns shorthand
+ *
+ * \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 valid
+ *
+ * Post condition: \a *ctx is updated with the next token to process
+ * If the input is invalid, then \a *ctx remains unchanged.
+ */
+css_error css__parse_columns(css_language *c,
+ const parserutils_vector *vector, int *ctx,
+ css_style *result)
+{
+ int orig_ctx = *ctx;
+ int prev_ctx;
+ const css_token *token;
+ css_error error = CSS_OK;
+ bool width = true;
+ bool count = true;
+ css_style *width_style;
+ css_style *count_style;
+
+ /* Firstly, handle inherit */
+ token = parserutils_vector_peek(vector, *ctx);
+ if (token == NULL)
+ return CSS_INVALID;
+
+ if (is_css_inherit(c, token)) {
+ error = css_stylesheet_style_inherit(result,
+ CSS_PROP_COLUMN_WIDTH);
+ if (error != CSS_OK)
+ return error;
+
+ error = css_stylesheet_style_inherit(result,
+ CSS_PROP_COLUMN_COUNT);
+ if (error == CSS_OK)
+ parserutils_vector_iterate(vector, ctx);
+
+ return error;
+ }
+
+ /* Allocate for styles */
+ error = css__stylesheet_style_create(c->sheet, &width_style);
+ if (error != CSS_OK)
+ return error;
+
+ error = css__stylesheet_style_create(c->sheet, &count_style);
+ if (error != CSS_OK) {
+ css__stylesheet_style_destroy(width_style);
+ return error;
+ }
+
+ /* Attempt to parse the various longhand properties */
+ do {
+ prev_ctx = *ctx;
+ error = CSS_OK;
+
+ if (is_css_inherit(c, token)) {
+ /* Can't have another inherit */
+ error = CSS_INVALID;
+ goto css__parse_columns_cleanup;
+ }
+
+ /* Try each property parser in turn, but only if we
+ * haven't already got a value for this property.
+ */
+ if ((width) &&
+ (error = css__parse_column_width(c, vector, ctx,
+ width_style)) == CSS_OK) {
+ width = false;
+ } else if ((count) &&
+ (error = css__parse_column_count(c, vector, ctx,
+ count_style)) == CSS_OK) {
+ count = false;
+ }
+
+ 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);
+
+ /* Set unset properties to initial values */
+ if (width) {
+ error = css__stylesheet_style_appendOPV(width_style,
+ CSS_PROP_COLUMN_WIDTH, 0,
+ COLUMN_WIDTH_AUTO);
+ if (error != CSS_OK)
+ goto css__parse_columns_cleanup;
+ }
+
+ if (count) {
+ error = css__stylesheet_style_appendOPV(count_style,
+ CSS_PROP_COLUMN_COUNT, 0,
+ COLUMN_COUNT_AUTO);
+ if (error != CSS_OK)
+ goto css__parse_columns_cleanup;
+ }
+
+ /* Merge styles into the result */
+ error = css__stylesheet_merge_style(result, width_style);
+ if (error != CSS_OK)
+ goto css__parse_columns_cleanup;
+
+ error = css__stylesheet_merge_style(result, count_style);
+
+
+css__parse_columns_cleanup:
+ css__stylesheet_style_destroy(width_style);
+ css__stylesheet_style_destroy(count_style);
+
+ if (error != CSS_OK)
+ *ctx = orig_ctx;
+
+ return error;
+}
+