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author | Vincent Sanders <vince@netsurf-browser.org> | 2011-01-02 23:20:31 +0000 |
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committer | Vincent Sanders <vince@netsurf-browser.org> | 2011-01-02 23:20:31 +0000 |
commit | f3cf0f579347a16120df8fc1c1ec3cd1f4e6d44e (patch) | |
tree | 4b98d88fc719198ebfa28f37a58fb61e8bddfcb8 /src/parse/properties/list_style.c | |
parent | 606cf0251feacadcaa63191a643dc8fc57a7c613 (diff) | |
download | libcss-f3cf0f579347a16120df8fc1c1ec3cd1f4e6d44e.tar.gz libcss-f3cf0f579347a16120df8fc1c1ec3cd1f4e6d44e.tar.bz2 |
simple properties split in parse similar to select in preparation for future generation
svn path=/trunk/libcss/; revision=11188
Diffstat (limited to 'src/parse/properties/list_style.c')
-rw-r--r-- | src/parse/properties/list_style.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/src/parse/properties/list_style.c b/src/parse/properties/list_style.c new file mode 100644 index 0000000..4c2043e --- /dev/null +++ b/src/parse/properties/list_style.c @@ -0,0 +1,199 @@ +/* + * 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 list-style + * + * \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_list_style(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 *image = NULL; + css_style *position = NULL; + css_style *type = NULL; + css_style *ret = NULL; + uint32_t required_size; + bool match; + css_error error; + + /* Firstly, handle inherit */ + token = parserutils_vector_peek(vector, *ctx); + if (token != NULL && token->type == CSS_TOKEN_IDENT && + (lwc_string_caseless_isequal( + token->idata, c->strings[INHERIT], + &match) == lwc_error_ok && match)) { + uint32_t *bytecode; + + error = css_stylesheet_style_create(c->sheet, + 3 * sizeof(uint32_t), &ret); + if (error != CSS_OK) { + *ctx = orig_ctx; + return error; + } + + bytecode = (uint32_t *) ret->bytecode; + + *(bytecode++) = buildOPV(CSS_PROP_LIST_STYLE_IMAGE, + FLAG_INHERIT, 0); + *(bytecode++) = buildOPV(CSS_PROP_LIST_STYLE_POSITION, + FLAG_INHERIT, 0); + *(bytecode++) = buildOPV(CSS_PROP_LIST_STYLE_TYPE, + 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; + + /* Ensure that we're not about to parse another inherit */ + token = parserutils_vector_peek(vector, *ctx); + if (token != NULL && token->type == CSS_TOKEN_IDENT && + (lwc_string_caseless_isequal( + token->idata, c->strings[INHERIT], + &match) == lwc_error_ok && match)) { + error = CSS_INVALID; + goto cleanup; + } + + if (type == NULL && (error = parse_list_style_type(c, vector, + ctx, &type)) == CSS_OK) { + } else if (position == NULL && + (error = parse_list_style_position(c, vector, + ctx, &position)) == CSS_OK) { + } else if (image == NULL && + (error = parse_list_style_image(c, vector, ctx, + &image)) == 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 (image) + required_size += image->length; + else + required_size += sizeof(uint32_t); + + if (position) + required_size += position->length; + else + required_size += sizeof(uint32_t); + + if (type) + required_size += type->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 (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_LIST_STYLE_IMAGE, + 0, LIST_STYLE_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_LIST_STYLE_POSITION, + 0, LIST_STYLE_POSITION_OUTSIDE); + required_size += sizeof(uint32_t); + } + + if (type) { + memcpy(((uint8_t *) ret->bytecode) + required_size, + type->bytecode, type->length); + required_size += type->length; + } else { + void *bc = ((uint8_t *) ret->bytecode) + required_size; + + *((uint32_t *) bc) = buildOPV(CSS_PROP_LIST_STYLE_TYPE, + 0, LIST_STYLE_TYPE_DISC); + 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 (image) + css_stylesheet_style_destroy(c->sheet, image, error == CSS_OK); + if (position) + css_stylesheet_style_destroy(c->sheet, position, error == CSS_OK); + if (type) + css_stylesheet_style_destroy(c->sheet, type, error == CSS_OK); + if (ret) + css_stylesheet_style_destroy(c->sheet, ret, error == CSS_OK); + + if (error != CSS_OK) + *ctx = orig_ctx; + + return error; +} |