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/*
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2010 The NetSurf Browser Project.
*/
#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 opacity
*
* \param c Parsing context
* \param vector Vector of tokens to process
* \param ctx Pointer to vector iteration context
* \param result 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_opacity(css_language *c,
const parserutils_vector *vector, int *ctx,
css_style *result)
{
int orig_ctx = *ctx;
css_error error;
const css_token *token;
bool match;
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 ((token->type == CSS_TOKEN_IDENT) && (lwc_string_caseless_isequal(token->idata, c->strings[INHERIT], &match) == lwc_error_ok && match)) {
error = css_stylesheet_style_inherit(result, CSS_PROP_OPACITY);
} else if (token->type == CSS_TOKEN_NUMBER) {
css_fixed num = 0;
size_t consumed = 0;
num = css__number_from_lwc_string(token->idata, false, &consumed);
/* Invalid if there are trailing characters */
if (consumed != lwc_string_length(token->idata)) {
*ctx = orig_ctx;
return CSS_INVALID;
}
/* Clamp to range [0,1] */
if (num < 0)
num = 0;
if (num > INTTOFIX(1))
num = INTTOFIX(1);
error = css__stylesheet_style_appendOPV(result, CSS_PROP_OPACITY, 0, OPACITY_SET);
if (error != CSS_OK) {
*ctx = orig_ctx;
return error;
}
error = css__stylesheet_style_append(result, num);
} else {
error = CSS_INVALID;
}
if (error != CSS_OK)
*ctx = orig_ctx;
return error;
}
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