/*
* 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 margin shorthand
*
* \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_margin(css_language *c,
const parserutils_vector *vector, int *ctx,
css_style *result)
{
int orig_ctx = *ctx;
int prev_ctx;
const css_token *token;
uint16_t side_val[4];
css_fixed side_length[4];
uint32_t side_unit[4];
uint32_t side_count = 0;
bool match;
css_error error;
/* Firstly, handle inherit */
token = parserutils_vector_peek(vector, *ctx);
if (token == NULL)
return CSS_INVALID;
if (is_css_inherit(c, token)) {
error = css_stylesheet_style_inherit(result, CSS_PROP_MARGIN_TOP);
if (error != CSS_OK)
return error;
error = css_stylesheet_style_inherit(result, CSS_PROP_MARGIN_RIGHT);
if (error != CSS_OK)
return error;
error = css_stylesheet_style_inherit(result, CSS_PROP_MARGIN_BOTTOM);
if (error != CSS_OK)
return error;
error = css_stylesheet_style_inherit(result, CSS_PROP_MARGIN_LEFT);
if (error == CSS_OK)
parserutils_vector_iterate(vector, ctx);
return error;
}
/* Attempt to parse up to 4 widths */
do {
prev_ctx = *ctx;
if ((token != NULL) && is_css_inherit(c, token)) {
*ctx = orig_ctx;
return CSS_INVALID;
}
if ((token->type == CSS_TOKEN_IDENT) && (lwc_string_caseless_isequal(token->idata, c->strings[AUTO], &match) == lwc_error_ok && match)) {
side_val[side_count] = MARGIN_AUTO;
parserutils_vector_iterate(vector, ctx);
error = CSS_OK;
} else {
side_val[side_count] = MARGIN_SET;
error = css__parse_unit_specifier(c, vector, ctx, UNIT_PX, &side_length[side_count], &side_unit[side_count]);
if (error == CSS_OK) {
if (side_unit[side_count] & UNIT_ANGLE||
side_unit[side_count] & UNIT_TIME||
side_unit[side_count] & UNIT_FREQ) {
*ctx = orig_ctx;
return CSS_INVALID;
}
}
}
if (error == CSS_OK) {
side_count++;
consumeWhitespace(vector, ctx);
token = parserutils_vector_peek(vector, *ctx);
} else {
/* Forcibly cause loop to exit */
token = NULL;
}
} while ((*ctx != prev_ctx) && (token != NULL) && (side_count < 4));
#define SIDE_APPEND(OP,NUM) \
error = css__stylesheet_style_appendOPV(result, (OP), 0, side_val[(NUM)]); \
if (error != CSS_OK) \
break; \
if (side_val[(NUM)] == MARGIN_SET) { \
error = css__stylesheet_style_append(result, side_length[(NUM)]); \
if (error != CSS_OK) \
break; \
error = css__stylesheet_style_append(result, side_unit[(NUM)]); \
if (error != CSS_OK) \
break; \
}
switch (side_count) {
case 1:
SIDE_APPEND(CSS_PROP_MARGIN_TOP, 0);
SIDE_APPEND(CSS_PROP_MARGIN_RIGHT, 0);
SIDE_APPEND(CSS_PROP_MARGIN_BOTTOM, 0);
SIDE_APPEND(CSS_PROP_MARGIN_LEFT, 0);
break;
case 2:
SIDE_APPEND(CSS_PROP_MARGIN_TOP, 0);
SIDE_APPEND(CSS_PROP_MARGIN_RIGHT, 1);
SIDE_APPEND(CSS_PROP_MARGIN_BOTTOM, 0);
SIDE_APPEND(CSS_PROP_MARGIN_LEFT, 1);
break;
case 3:
SIDE_APPEND(CSS_PROP_MARGIN_TOP, 0);
SIDE_APPEND(CSS_PROP_MARGIN_RIGHT, 1);
SIDE_APPEND(CSS_PROP_MARGIN_BOTTOM, 2);
SIDE_APPEND(CSS_PROP_MARGIN_LEFT, 1);
break;
case 4:
SIDE_APPEND(CSS_PROP_MARGIN_TOP, 0);
SIDE_APPEND(CSS_PROP_MARGIN_RIGHT, 1);
SIDE_APPEND(CSS_PROP_MARGIN_BOTTOM, 2);
SIDE_APPEND(CSS_PROP_MARGIN_LEFT, 3);
break;
default:
error = CSS_INVALID;
}
if (error != CSS_OK)
*ctx = orig_ctx;
return error;
}