/* * 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;}