diff options
Diffstat (limited to 'src/parse/properties/columns.c')
-rw-r--r-- | src/parse/properties/columns.c | 141 |
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; +} + |