/*
* 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 elevation
*
* \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 css__parse_elevation(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;
css_fixed length = 0;
uint32_t unit = 0;
bool match;
/* angle | IDENT(below, level, above, higher, lower, 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[BELOW],
&match) == lwc_error_ok && match)) {
parserutils_vector_iterate(vector, ctx);
value = ELEVATION_BELOW;
} else if (token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[LEVEL],
&match) == lwc_error_ok && match)) {
parserutils_vector_iterate(vector, ctx);
value = ELEVATION_LEVEL;
} else if (token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[ABOVE],
&match) == lwc_error_ok && match)) {
parserutils_vector_iterate(vector, ctx);
value = ELEVATION_ABOVE;
} else if (token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[HIGHER],
&match) == lwc_error_ok && match)) {
parserutils_vector_iterate(vector, ctx);
value = ELEVATION_HIGHER;
} else if (token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[LOWER],
&match) == lwc_error_ok && match)) {
parserutils_vector_iterate(vector, ctx);
value = ELEVATION_LOWER;
} else {
error = css__parse_unit_specifier(c, vector, ctx, UNIT_DEG,
&length, &unit);
if (error != CSS_OK) {
*ctx = orig_ctx;
return error;
}
if ((unit & UNIT_ANGLE) == false) {
*ctx = orig_ctx;
return CSS_INVALID;
}
/* Valid angles lie between -90 and 90 degrees */
if (unit == UNIT_DEG) {
if (length < -F_90 || length > F_90) {
*ctx = orig_ctx;
return CSS_INVALID;
}
} else if (unit == UNIT_GRAD) {
if (length < -F_100 || length > F_100) {
*ctx = orig_ctx;
return CSS_INVALID;
}
} else if (unit == UNIT_RAD) {
if (length < -F_PI_2 || length > F_PI_2) {
*ctx = orig_ctx;
return CSS_INVALID;
}
}
value = ELEVATION_ANGLE;
}
error = css__stylesheet_style_appendOPV(result, CSS_PROP_ELEVATION, flags, value);
if (error != CSS_OK) {
*ctx = orig_ctx;
return error;
}
if (((flags & FLAG_INHERIT) == false) && (value == ELEVATION_ANGLE)) {
error = css__stylesheet_style_vappend(result, 2, length, unit);
if (error != CSS_OK) {
*ctx = orig_ctx;
return error;
}
}
return CSS_OK;
}