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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/background_position.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/background_position.c')
-rw-r--r-- | src/parse/properties/background_position.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/src/parse/properties/background_position.c b/src/parse/properties/background_position.c new file mode 100644 index 0000000..94bce82 --- /dev/null +++ b/src/parse/properties/background_position.c @@ -0,0 +1,224 @@ +/* + * 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 background-position + * + * \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_background_position(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; + uint32_t opv; + uint16_t value[2] = { 0 }; + css_fixed length[2] = { 0 }; + uint32_t unit[2] = { 0 }; + uint32_t required_size; + bool match; + + /* [length | percentage | IDENT(left, right, top, bottom, center)]{1,2} + * | IDENT(inherit) */ + token = parserutils_vector_peek(vector, *ctx); + if (token == NULL) { + *ctx = orig_ctx; + return CSS_INVALID; + } + + if (token->type == CSS_TOKEN_IDENT && + (lwc_string_caseless_isequal( + token->idata, c->strings[INHERIT], + &match) == lwc_error_ok && match)) { + parserutils_vector_iterate(vector, ctx); + flags = FLAG_INHERIT; + } else { + int i; + + for (i = 0; i < 2; i++) { + token = parserutils_vector_peek(vector, *ctx); + if (token == NULL) + break; + + if (token->type == CSS_TOKEN_IDENT) { + if ((lwc_string_caseless_isequal( + token->idata, c->strings[LEFT], + &match) == lwc_error_ok && + match)) { + value[i] = + BACKGROUND_POSITION_HORZ_LEFT; + } else if ((lwc_string_caseless_isequal( + token->idata, c->strings[RIGHT], + &match) == lwc_error_ok && + match)) { + value[i] = + BACKGROUND_POSITION_HORZ_RIGHT; + } else if ((lwc_string_caseless_isequal( + token->idata, c->strings[TOP], + &match) == lwc_error_ok && + match)) { + value[i] = BACKGROUND_POSITION_VERT_TOP; + } else if ((lwc_string_caseless_isequal( + token->idata, + c->strings[BOTTOM], + &match) == lwc_error_ok && + match)) { + value[i] = + BACKGROUND_POSITION_VERT_BOTTOM; + } else if ((lwc_string_caseless_isequal( + token->idata, + c->strings[CENTER], + &match) == lwc_error_ok && + match)) { + /* We'll fix this up later */ + value[i] = + BACKGROUND_POSITION_VERT_CENTER; + } else if (i == 1) { + /* Second pass, so ignore this one */ + break; + } else { + /* First pass, so invalid */ + *ctx = orig_ctx; + return CSS_INVALID; + } + + parserutils_vector_iterate(vector, ctx); + } else if (token->type == CSS_TOKEN_DIMENSION || + token->type == CSS_TOKEN_NUMBER || + token->type == CSS_TOKEN_PERCENTAGE) { + error = parse_unit_specifier(c, vector, ctx, + UNIT_PX, &length[i], &unit[i]); + if (error != CSS_OK) { + *ctx = orig_ctx; + return error; + } + + if (unit[i] & UNIT_ANGLE || + unit[i] & UNIT_TIME || + unit[i] & UNIT_FREQ) { + *ctx = orig_ctx; + return CSS_INVALID; + } + + /* We'll fix this up later, too */ + value[i] = BACKGROUND_POSITION_VERT_SET; + } else { + if (i == 1) { + /* Second pass, so ignore */ + break; + } else { + /* First pass, so invalid */ + *ctx = orig_ctx; + return CSS_INVALID; + } + } + + consumeWhitespace(vector, ctx); + } + + assert(i != 0); + + /* Now, sort out the mess we've got */ + if (i == 1) { + assert(BACKGROUND_POSITION_VERT_CENTER == + BACKGROUND_POSITION_HORZ_CENTER); + + /* Only one value, so the other is center */ + switch (value[0]) { + case BACKGROUND_POSITION_HORZ_LEFT: + case BACKGROUND_POSITION_HORZ_RIGHT: + case BACKGROUND_POSITION_VERT_CENTER: + case BACKGROUND_POSITION_VERT_TOP: + case BACKGROUND_POSITION_VERT_BOTTOM: + break; + case BACKGROUND_POSITION_VERT_SET: + value[0] = BACKGROUND_POSITION_HORZ_SET; + break; + } + + value[1] = BACKGROUND_POSITION_VERT_CENTER; + } else if (value[0] != BACKGROUND_POSITION_VERT_SET && + value[1] != BACKGROUND_POSITION_VERT_SET) { + /* Two keywords. Verify the axes differ */ + if (((value[0] & 0xf) != 0 && (value[1] & 0xf) != 0) || + ((value[0] & 0xf0) != 0 && + (value[1] & 0xf0) != 0)) { + *ctx = orig_ctx; + return CSS_INVALID; + } + } else { + /* One or two non-keywords. First is horizontal */ + if (value[0] == BACKGROUND_POSITION_VERT_SET) + value[0] = BACKGROUND_POSITION_HORZ_SET; + + /* Verify the axes differ */ + if (((value[0] & 0xf) != 0 && (value[1] & 0xf) != 0) || + ((value[0] & 0xf0) != 0 && + (value[1] & 0xf0) != 0)) { + *ctx = orig_ctx; + return CSS_INVALID; + } + } + } + + opv = buildOPV(CSS_PROP_BACKGROUND_POSITION, flags, + value[0] | value[1]); + + required_size = sizeof(opv); + if ((flags & FLAG_INHERIT) == false) { + if (value[0] == BACKGROUND_POSITION_HORZ_SET) + required_size += sizeof(length[0]) + sizeof(unit[0]); + if (value[1] == BACKGROUND_POSITION_VERT_SET) + required_size += sizeof(length[1]) + sizeof(unit[1]); + } + + /* 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) { + uint8_t *ptr = ((uint8_t *) (*result)->bytecode) + sizeof(opv); + if (value[0] == BACKGROUND_POSITION_HORZ_SET) { + memcpy(ptr, &length[0], sizeof(length[0])); + ptr += sizeof(length[0]); + memcpy(ptr, &unit[0], sizeof(unit[0])); + ptr += sizeof(unit[0]); + } + if (value[1] == BACKGROUND_POSITION_VERT_SET) { + memcpy(ptr, &length[1], sizeof(length[1])); + ptr += sizeof(length[1]); + memcpy(ptr, &unit[1], sizeof(unit[1])); + } + } + + return CSS_OK; +} |