diff options
Diffstat (limited to 'src/parse/properties/orphans.c')
-rw-r--r-- | src/parse/properties/orphans.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/parse/properties/orphans.c b/src/parse/properties/orphans.c new file mode 100644 index 0000000..735db60 --- /dev/null +++ b/src/parse/properties/orphans.c @@ -0,0 +1,98 @@ +/* + * This file is part of LibCSS. + * Licensed under the MIT License, + * http://www.opensource.org/licenses/mit-license.php + * Copyright 2009 John-Mark Bell <jmb@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 orphans + * + * \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 parse_orphans(css_language *c, + const parserutils_vector *vector, int *ctx, + css_style **result) +{ + int orig_ctx = *ctx; + css_error error; + const css_token *token; + uint8_t flags = 0; + uint16_t value = 0; + uint32_t opv; + css_fixed num = 0; + uint32_t required_size; + bool match; + + /* <integer> | IDENT (inherit) */ + token = parserutils_vector_iterate(vector, ctx); + if (token == NULL || (token->type != CSS_TOKEN_IDENT && + token->type != CSS_TOKEN_NUMBER)) { + *ctx = orig_ctx; + return CSS_INVALID; + } + + if ((lwc_string_caseless_isequal( + token->idata, c->strings[INHERIT], + &match) == lwc_error_ok && match)) { + flags |= FLAG_INHERIT; + } else if (token->type == CSS_TOKEN_NUMBER) { + size_t consumed = 0; + num = number_from_lwc_string(token->idata, true, &consumed); + /* Invalid if there are trailing characters */ + if (consumed != lwc_string_length(token->idata)) { + *ctx = orig_ctx; + return CSS_INVALID; + } + + /* Negative values are nonsensical */ + if (num < 0) { + *ctx = orig_ctx; + return CSS_INVALID; + } + + value = ORPHANS_SET; + } else { + *ctx = orig_ctx; + return CSS_INVALID; + } + + opv = buildOPV(CSS_PROP_ORPHANS, flags, value); + + required_size = sizeof(opv); + if ((flags & FLAG_INHERIT) == false && value == ORPHANS_SET) + required_size += sizeof(num); + + /* Allocate result */ + error = css_stylesheet_style_create(c->sheet, required_size, result); + if (error != CSS_OK) { + *ctx = orig_ctx; + return error; + } + + /* Copy the bytecode to it */ + memcpy((*result)->bytecode, &opv, sizeof(opv)); + if ((flags & FLAG_INHERIT) == false && value == ORPHANS_SET) { + memcpy(((uint8_t *) (*result)->bytecode) + sizeof(opv), + &num, sizeof(num)); + } + + return CSS_OK; +} |