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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 elevation |
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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_elevation(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 = 0; |
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| 39 | css_fixed length = 0; |
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| 40 | uint32_t unit = 0; |
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| 41 | bool match; |
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| 42 | |||
| 43 | /* angle | IDENT(below, level, above, higher, lower, inherit) */ |
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| 44 | token = parserutils_vector_peek(vector, *ctx); |
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| 45 | if (token == NULL) { |
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| 46 | *ctx = orig_ctx; |
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| 47 | return CSS_INVALID; |
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| 48 | } |
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| 49 | |||
| 50 | if (token->type == CSS_TOKEN_IDENT && |
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| 51 | (lwc_string_caseless_isequal( |
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| 52 | token->idata, c->strings[INHERIT], |
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| 53 | &match) == lwc_error_ok && match)) { |
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| 54 | parserutils_vector_iterate(vector, ctx); |
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| 55 | flags = FLAG_INHERIT; |
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| 56 | } else if (token->type == CSS_TOKEN_IDENT && |
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| 57 | (lwc_string_caseless_isequal( |
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| 58 | token->idata, c->strings[BELOW], |
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| 59 | &match) == lwc_error_ok && match)) { |
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| 60 | parserutils_vector_iterate(vector, ctx); |
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| 61 | value = ELEVATION_BELOW; |
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| 62 | } else if (token->type == CSS_TOKEN_IDENT && |
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| 63 | (lwc_string_caseless_isequal( |
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| 64 | token->idata, c->strings[LEVEL], |
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| 65 | &match) == lwc_error_ok && match)) { |
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| 66 | parserutils_vector_iterate(vector, ctx); |
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| 67 | value = ELEVATION_LEVEL; |
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| 68 | } else if (token->type == CSS_TOKEN_IDENT && |
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| 69 | (lwc_string_caseless_isequal( |
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| 70 | token->idata, c->strings[ABOVE], |
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| 71 | &match) == lwc_error_ok && match)) { |
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| 72 | parserutils_vector_iterate(vector, ctx); |
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| 73 | value = ELEVATION_ABOVE; |
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| 74 | } else if (token->type == CSS_TOKEN_IDENT && |
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| 75 | (lwc_string_caseless_isequal( |
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| 76 | token->idata, c->strings[HIGHER], |
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| 77 | &match) == lwc_error_ok && match)) { |
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| 78 | parserutils_vector_iterate(vector, ctx); |
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| 79 | value = ELEVATION_HIGHER; |
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| 80 | } else if (token->type == CSS_TOKEN_IDENT && |
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| 81 | (lwc_string_caseless_isequal( |
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| 82 | token->idata, c->strings[LOWER], |
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| 83 | &match) == lwc_error_ok && match)) { |
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| 84 | parserutils_vector_iterate(vector, ctx); |
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| 85 | value = ELEVATION_LOWER; |
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| 86 | } else { |
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| 87 | error = css__parse_unit_specifier(c, vector, ctx, UNIT_DEG, |
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| 88 | &length, &unit); |
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| 89 | if (error != CSS_OK) { |
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| 90 | *ctx = orig_ctx; |
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| 91 | return error; |
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| 92 | } |
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| 93 | |||
| 94 | if ((unit & UNIT_ANGLE) == false) { |
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| 95 | *ctx = orig_ctx; |
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| 96 | return CSS_INVALID; |
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| 97 | } |
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| 98 | |||
| 99 | /* Valid angles lie between -90 and 90 degrees */ |
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| 100 | if (unit == UNIT_DEG) { |
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| 101 | if (length < -F_90 || length > F_90) { |
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| 102 | *ctx = orig_ctx; |
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| 103 | return CSS_INVALID; |
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| 104 | } |
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| 105 | } else if (unit == UNIT_GRAD) { |
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| 106 | if (length < -F_100 || length > F_100) { |
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| 107 | *ctx = orig_ctx; |
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| 108 | return CSS_INVALID; |
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| 109 | } |
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| 110 | } else if (unit == UNIT_RAD) { |
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| 111 | if (length < -F_PI_2 || length > F_PI_2) { |
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| 112 | *ctx = orig_ctx; |
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| 113 | return CSS_INVALID; |
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| 114 | } |
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| 115 | } |
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| 116 | |||
| 117 | value = ELEVATION_ANGLE; |
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| 118 | } |
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| 119 | |||
| 120 | error = css__stylesheet_style_appendOPV(result, CSS_PROP_ELEVATION, flags, value); |
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| 121 | if (error != CSS_OK) { |
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| 122 | *ctx = orig_ctx; |
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| 123 | return error; |
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| 124 | } |
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| 125 | |||
| 126 | if (((flags & FLAG_INHERIT) == false) && (value == ELEVATION_ANGLE)) { |
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| 127 | error = css__stylesheet_style_vappend(result, 2, length, unit); |
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| 128 | if (error != CSS_OK) { |
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| 129 | *ctx = orig_ctx; |
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| 130 | return error; |
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| 131 | } |
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| 132 | } |
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| 133 | |||
| 134 | return CSS_OK; |
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| 135 | } |