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| 3584 | sourcerer | 1 | /* |
| 2 | * This file is part of LibCSS. |
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| 3 | * Licensed under the MIT License, |
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| 4 | * http://www.opensource.org/licenses/mit-license.php |
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| 5 | * Copyright 2009 John-Mark Bell |
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| 6 | */ |
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| 7 | |||
| 8 | #include |
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| 9 | #include |
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| 10 | |||
| 11 | #include "bytecode/bytecode.h" |
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| 12 | #include "bytecode/opcodes.h" |
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| 13 | #include "parse/properties/properties.h" |
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| 14 | #include "parse/properties/utils.h" |
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| 15 | |||
| 16 | /** |
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| 17 | * Parse background-position |
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| 18 | * |
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| 19 | * \param c Parsing context |
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| 20 | * \param vector Vector of tokens to process |
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| 21 | * \param ctx Pointer to vector iteration context |
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| 22 | * \param result Pointer to location to receive resulting style |
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| 23 | * \return CSS_OK on success, |
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| 24 | * CSS_NOMEM on memory exhaustion, |
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| 25 | * CSS_INVALID if the input is not valid |
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| 26 | * |
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| 27 | * Post condition: \a *ctx is updated with the next token to process |
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| 28 | * If the input is invalid, then \a *ctx remains unchanged. |
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| 29 | */ |
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| 30 | css_error css__parse_background_position(css_language *c, |
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| 31 | const parserutils_vector *vector, int *ctx, |
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| 32 | css_style *result) |
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| 33 | { |
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| 34 | int orig_ctx = *ctx; |
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| 35 | css_error error; |
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| 36 | const css_token *token; |
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| 37 | uint8_t flags = 0; |
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| 38 | uint16_t value[2] = { 0 }; |
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| 39 | css_fixed length[2] = { 0 }; |
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| 40 | uint32_t unit[2] = { 0 }; |
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| 41 | bool match; |
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| 42 | |||
| 43 | /* [length | percentage | IDENT(left, right, top, bottom, center)]{1,2} |
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| 44 | * | IDENT(inherit) */ |
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| 45 | token = parserutils_vector_peek(vector, *ctx); |
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| 46 | if (token == NULL) { |
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| 47 | *ctx = orig_ctx; |
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| 48 | return CSS_INVALID; |
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| 49 | } |
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| 50 | |||
| 51 | if (token->type == CSS_TOKEN_IDENT && |
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| 52 | (lwc_string_caseless_isequal( |
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| 53 | token->idata, c->strings[INHERIT], |
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| 54 | &match) == lwc_error_ok && match)) { |
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| 55 | parserutils_vector_iterate(vector, ctx); |
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| 56 | flags = FLAG_INHERIT; |
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| 57 | } else { |
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| 58 | int i; |
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| 59 | |||
| 60 | for (i = 0; i < 2; i++) { |
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| 61 | token = parserutils_vector_peek(vector, *ctx); |
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| 62 | if (token == NULL) |
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| 63 | break; |
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| 64 | |||
| 65 | if (token->type == CSS_TOKEN_IDENT) { |
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| 66 | if ((lwc_string_caseless_isequal( |
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| 67 | token->idata, c->strings[LEFT], |
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| 68 | &match) == lwc_error_ok && |
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| 69 | match)) { |
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| 70 | value[i] = |
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| 71 | BACKGROUND_POSITION_HORZ_LEFT; |
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| 72 | } else if ((lwc_string_caseless_isequal( |
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| 73 | token->idata, c->strings[RIGHT], |
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| 74 | &match) == lwc_error_ok && |
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| 75 | match)) { |
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| 76 | value[i] = |
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| 77 | BACKGROUND_POSITION_HORZ_RIGHT; |
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| 78 | } else if ((lwc_string_caseless_isequal( |
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| 79 | token->idata, c->strings[TOP], |
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| 80 | &match) == lwc_error_ok && |
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| 81 | match)) { |
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| 82 | value[i] = BACKGROUND_POSITION_VERT_TOP; |
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| 83 | } else if ((lwc_string_caseless_isequal( |
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| 84 | token->idata, |
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| 85 | c->strings[BOTTOM], |
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| 86 | &match) == lwc_error_ok && |
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| 87 | match)) { |
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| 88 | value[i] = |
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| 89 | BACKGROUND_POSITION_VERT_BOTTOM; |
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| 90 | } else if ((lwc_string_caseless_isequal( |
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| 91 | token->idata, |
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| 92 | c->strings[CENTER], |
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| 93 | &match) == lwc_error_ok && |
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| 94 | match)) { |
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| 95 | /* We'll fix this up later */ |
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| 96 | value[i] = |
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| 97 | BACKGROUND_POSITION_VERT_CENTER; |
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| 98 | } else if (i == 1) { |
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| 99 | /* Second pass, so ignore this one */ |
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| 100 | break; |
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| 101 | } else { |
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| 102 | /* First pass, so invalid */ |
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| 103 | *ctx = orig_ctx; |
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| 104 | return CSS_INVALID; |
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| 105 | } |
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| 106 | |||
| 107 | parserutils_vector_iterate(vector, ctx); |
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| 108 | } else if (token->type == CSS_TOKEN_DIMENSION || |
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| 109 | token->type == CSS_TOKEN_NUMBER || |
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| 110 | token->type == CSS_TOKEN_PERCENTAGE) { |
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| 111 | error = css__parse_unit_specifier(c, vector, ctx, |
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| 112 | UNIT_PX, &length[i], &unit[i]); |
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| 113 | if (error != CSS_OK) { |
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| 114 | *ctx = orig_ctx; |
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| 115 | return error; |
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| 116 | } |
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| 117 | |||
| 118 | if (unit[i] & UNIT_ANGLE || |
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| 119 | unit[i] & UNIT_TIME || |
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| 120 | unit[i] & UNIT_FREQ) { |
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| 121 | *ctx = orig_ctx; |
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| 122 | return CSS_INVALID; |
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| 123 | } |
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| 124 | |||
| 125 | /* We'll fix this up later, too */ |
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| 126 | value[i] = BACKGROUND_POSITION_VERT_SET; |
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| 127 | } else { |
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| 128 | if (i == 1) { |
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| 129 | /* Second pass, so ignore */ |
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| 130 | break; |
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| 131 | } else { |
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| 132 | /* First pass, so invalid */ |
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| 133 | *ctx = orig_ctx; |
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| 134 | return CSS_INVALID; |
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| 135 | } |
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| 136 | } |
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| 137 | |||
| 138 | consumeWhitespace(vector, ctx); |
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| 139 | } |
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| 140 | |||
| 141 | assert(i != 0); |
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| 142 | |||
| 143 | /* Now, sort out the mess we've got */ |
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| 144 | if (i == 1) { |
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| 145 | assert(BACKGROUND_POSITION_VERT_CENTER == |
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| 146 | BACKGROUND_POSITION_HORZ_CENTER); |
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| 147 | |||
| 148 | /* Only one value, so the other is center */ |
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| 149 | switch (value[0]) { |
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| 150 | case BACKGROUND_POSITION_HORZ_LEFT: |
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| 151 | case BACKGROUND_POSITION_HORZ_RIGHT: |
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| 152 | case BACKGROUND_POSITION_VERT_CENTER: |
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| 153 | case BACKGROUND_POSITION_VERT_TOP: |
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| 154 | case BACKGROUND_POSITION_VERT_BOTTOM: |
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| 155 | break; |
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| 156 | case BACKGROUND_POSITION_VERT_SET: |
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| 157 | value[0] = BACKGROUND_POSITION_HORZ_SET; |
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| 158 | break; |
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| 159 | } |
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| 160 | |||
| 161 | value[1] = BACKGROUND_POSITION_VERT_CENTER; |
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| 162 | } else if (value[0] != BACKGROUND_POSITION_VERT_SET && |
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| 163 | value[1] != BACKGROUND_POSITION_VERT_SET) { |
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| 164 | /* Two keywords. Verify the axes differ */ |
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| 165 | if (((value[0] & 0xf) != 0 && (value[1] & 0xf) != 0) || |
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| 166 | ((value[0] & 0xf0) != 0 && |
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| 167 | (value[1] & 0xf0) != 0)) { |
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| 168 | *ctx = orig_ctx; |
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| 169 | return CSS_INVALID; |
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| 170 | } |
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| 171 | } else { |
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| 172 | /* One or two non-keywords. First is horizontal */ |
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| 173 | if (value[0] == BACKGROUND_POSITION_VERT_SET) |
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| 174 | value[0] = BACKGROUND_POSITION_HORZ_SET; |
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| 175 | |||
| 176 | /* Verify the axes differ */ |
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| 177 | if (((value[0] & 0xf) != 0 && (value[1] & 0xf) != 0) || |
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| 178 | ((value[0] & 0xf0) != 0 && |
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| 179 | (value[1] & 0xf0) != 0)) { |
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| 180 | *ctx = orig_ctx; |
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| 181 | return CSS_INVALID; |
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| 182 | } |
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| 183 | } |
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| 184 | } |
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| 185 | |||
| 186 | error = css__stylesheet_style_appendOPV(result, |
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| 187 | CSS_PROP_BACKGROUND_POSITION, |
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| 188 | flags, |
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| 189 | value[0] | value[1]); |
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| 190 | if (error != CSS_OK) { |
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| 191 | *ctx = orig_ctx; |
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| 192 | return error; |
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| 193 | } |
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| 194 | |||
| 195 | if ((flags & FLAG_INHERIT) == false) { |
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| 196 | if (value[0] == BACKGROUND_POSITION_HORZ_SET) { |
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| 197 | css__stylesheet_style_append(result, length[0]); |
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| 198 | css__stylesheet_style_append(result, unit[0]); |
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| 199 | } |
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| 200 | if (value[1] == BACKGROUND_POSITION_VERT_SET) { |
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| 201 | css__stylesheet_style_append(result, length[1]); |
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| 202 | css__stylesheet_style_append(result, unit[1]); |
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| 203 | } |
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| 204 | } |
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| 205 | |||
| 206 | return CSS_OK; |
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| 207 | } |