diff options
Diffstat (limited to 'src/parse/properties/flex_flow.c')
-rw-r--r-- | src/parse/properties/flex_flow.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/parse/properties/flex_flow.c b/src/parse/properties/flex_flow.c new file mode 100644 index 0000000..40a42d9 --- /dev/null +++ b/src/parse/properties/flex_flow.c @@ -0,0 +1,137 @@ +* + * This file is part of LibCSS. + * Licensed under the MIT License, + * http://www.opensource.org/licenses/mit-license.php + * Copyright 2017 Lucas Neves <lcneves@gmail.com> + */ + +#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 flex-flow + * + * \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_flex_flow(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; + bool direction = true; + bool wrap = true; + css_style *direction_style; + css_style *wrap_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_FLEX_DIRECTION); + if (error != CSS_OK) + return error; + + error = css_stylesheet_style_inherit(result, + CSS_PROP_FLEX_WRAP); + + if (error == CSS_OK) + parserutils_vector_iterate(vector, ctx); + + return error; + } + + /* allocate styles */ + error = css__stylesheet_style_create(c->sheet, &direction_style); + if (error != CSS_OK) + return error; + + error = css__stylesheet_style_create(c->sheet, &wrap_style); + if (error != CSS_OK) { + css__stylesheet_style_destroy(direction_style); + return error; + } + + /* Attempt to parse the various longhand properties */ + do { + prev_ctx = *ctx; + error = CSS_OK; + + /* Ensure that we're not about to parse another inherit */ + token = parserutils_vector_peek(vector, *ctx); + if (token != NULL && is_css_inherit(c, token)) { + error = CSS_INVALID; + goto css__parse_flex_flow_cleanup; + } + + if ((wrap) && + (error = css__parse_flex_wrap(c, vector, + ctx, wrap_style)) == CSS_OK) { + wrap = false; + } else if ((direction) && + (error = css__parse_flex_direction(c, vector, + ctx, direction_style)) == CSS_OK) { + direction = 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); + + + /* defaults */ + if (direction) { + error = css__stylesheet_style_appendOPV(direction_style, + CSS_PROP_FLEX_DIRECTION, + 0, FLEX_DIRECTION_ROW); + } + + if (wrap) { + error = css__stylesheet_style_appendOPV(wrap_style, + CSS_PROP_FLEX_WRAP, + 0, FLEX_WRAP_NOWRAP); + } + + error = css__stylesheet_merge_style(result, direction_style); + if (error != CSS_OK) + goto css__parse_flex_flow_cleanup; + + error = css__stylesheet_merge_style(result, wrap_style); + +css__parse_flex_flow_cleanup: + + css__stylesheet_style_destroy(wrap_style); + css__stylesheet_style_destroy(direction_style); + + if (error != CSS_OK) + *ctx = orig_ctx; + + return error; +} + |