diff options
Diffstat (limited to 'src/parse/properties/volume.c')
-rw-r--r-- | src/parse/properties/volume.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/parse/properties/volume.c b/src/parse/properties/volume.c new file mode 100644 index 0000000..2d4c90e --- /dev/null +++ b/src/parse/properties/volume.c @@ -0,0 +1,161 @@ +/* + * 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 volume + * + * \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_volume(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 length = 0; + uint32_t unit = 0; + uint32_t required_size; + bool match; + + /* number | percentage | IDENT(silent, x-soft, soft, medium, loud, + * x-loud, 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 if (token->type == CSS_TOKEN_IDENT && + (lwc_string_caseless_isequal( + token->idata, c->strings[SILENT], + &match) == lwc_error_ok && match)) { + parserutils_vector_iterate(vector, ctx); + value = VOLUME_SILENT; + } else if (token->type == CSS_TOKEN_IDENT && + (lwc_string_caseless_isequal( + token->idata, c->strings[X_SOFT], + &match) == lwc_error_ok && match)) { + parserutils_vector_iterate(vector, ctx); + value = VOLUME_X_SOFT; + } else if (token->type == CSS_TOKEN_IDENT && + (lwc_string_caseless_isequal( + token->idata, c->strings[SOFT], + &match) == lwc_error_ok && match)) { + parserutils_vector_iterate(vector, ctx); + value = VOLUME_SOFT; + } else if (token->type == CSS_TOKEN_IDENT && + (lwc_string_caseless_isequal( + token->idata, c->strings[MEDIUM], + &match) == lwc_error_ok && match)) { + parserutils_vector_iterate(vector, ctx); + value = VOLUME_MEDIUM; + } else if (token->type == CSS_TOKEN_IDENT && + (lwc_string_caseless_isequal( + token->idata, c->strings[LOUD], + &match) == lwc_error_ok && match)) { + parserutils_vector_iterate(vector, ctx); + value = VOLUME_LOUD; + } else if (token->type == CSS_TOKEN_IDENT && + (lwc_string_caseless_isequal( + token->idata, c->strings[X_LOUD], + &match) == lwc_error_ok && match)) { + parserutils_vector_iterate(vector, ctx); + value = VOLUME_X_LOUD; + } else if (token->type == CSS_TOKEN_NUMBER) { + size_t consumed = 0; + length = number_from_lwc_string(token->idata, false, &consumed); + if (consumed != lwc_string_length(token->idata)) { + *ctx = orig_ctx; + return CSS_INVALID; + } + + /* Must be between 0 and 100 */ + if (length < 0 || length > F_100) { + *ctx = orig_ctx; + return CSS_INVALID; + } + + parserutils_vector_iterate(vector, ctx); + value = VOLUME_NUMBER; + } else { + /* Yes, really UNIT_PX -- percentages MUST have a % sign */ + error = parse_unit_specifier(c, vector, ctx, UNIT_PX, + &length, &unit); + if (error != CSS_OK) { + *ctx = orig_ctx; + return error; + } + + if ((unit & UNIT_PCT) == false) { + *ctx = orig_ctx; + return CSS_INVALID; + } + + /* Must be positive */ + if (length < 0) { + *ctx = orig_ctx; + return CSS_INVALID; + } + + value = VOLUME_DIMENSION; + } + + opv = buildOPV(CSS_PROP_VOLUME, flags, value); + + required_size = sizeof(opv); + if ((flags & FLAG_INHERIT) == false && value == VOLUME_NUMBER) + required_size += sizeof(length); + else if ((flags & FLAG_INHERIT) == false && value == VOLUME_DIMENSION) + required_size += sizeof(length) + sizeof(unit); + + /* 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 == VOLUME_NUMBER || + value == VOLUME_DIMENSION)) + memcpy(((uint8_t *) (*result)->bytecode) + sizeof(opv), + &length, sizeof(length)); + if ((flags & FLAG_INHERIT) == false && value == VOLUME_DIMENSION) + memcpy(((uint8_t *) (*result)->bytecode) + sizeof(opv) + + sizeof(length), &unit, sizeof(unit)); + + return CSS_OK; +} |