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  1. /*
  2.  * Licensed under the MIT License,
  3.  *                http://www.opensource.org/licenses/mit-license.php
  4.  * Copyright 2010 The NetSurf Browser Project.
  5.  */
  6.  
  7. #include <assert.h>
  8. #include <string.h>
  9.  
  10. #include "bytecode/bytecode.h"
  11. #include "bytecode/opcodes.h"
  12. #include "parse/properties/properties.h"
  13. #include "parse/properties/utils.h"
  14.  
  15. /**
  16.  * Parse opacity
  17.  *
  18.  * \param c       Parsing context
  19.  * \param vector  Vector of tokens to process
  20.  * \param ctx     Pointer to vector iteration context
  21.  * \param result  resulting style
  22.  * \return CSS_OK on success,
  23.  *         CSS_NOMEM on memory exhaustion,
  24.  *         CSS_INVALID if the input is not valid
  25.  *
  26.  * Post condition: \a *ctx is updated with the next token to process
  27.  *                 If the input is invalid, then \a *ctx remains unchanged.
  28.  */
  29. css_error css__parse_opacity(css_language *c,
  30.                 const parserutils_vector *vector, int *ctx,
  31.                 css_style *result)
  32. {
  33.         int orig_ctx = *ctx;
  34.         css_error error;
  35.         const css_token *token;
  36.         bool match;
  37.  
  38.         token = parserutils_vector_iterate(vector, ctx);
  39.         if ((token == NULL) || ((token->type != CSS_TOKEN_IDENT) && (token->type != CSS_TOKEN_NUMBER))) {
  40.                 *ctx = orig_ctx;
  41.                 return CSS_INVALID;
  42.         }
  43.  
  44.         if ((token->type == CSS_TOKEN_IDENT) && (lwc_string_caseless_isequal(token->idata, c->strings[INHERIT], &match) == lwc_error_ok && match)) {
  45.                         error = css_stylesheet_style_inherit(result, CSS_PROP_OPACITY);
  46.         } else if (token->type == CSS_TOKEN_NUMBER) {
  47.                 css_fixed num = 0;
  48.                 size_t consumed = 0;
  49.  
  50.                 num = css__number_from_lwc_string(token->idata, false, &consumed);
  51.                 /* Invalid if there are trailing characters */
  52.                 if (consumed != lwc_string_length(token->idata)) {
  53.                         *ctx = orig_ctx;
  54.                         return CSS_INVALID;
  55.                 }
  56.  
  57.                 /* Clamp to range [0,1] */
  58.                 if (num < 0)
  59.                         num = 0;
  60.                 if (num > INTTOFIX(1))
  61.                         num = INTTOFIX(1);
  62.  
  63.                 error = css__stylesheet_style_appendOPV(result, CSS_PROP_OPACITY, 0, OPACITY_SET);
  64.                 if (error != CSS_OK) {
  65.                         *ctx = orig_ctx;
  66.                         return error;
  67.                 }
  68.  
  69.                 error = css__stylesheet_style_append(result, num);
  70.         } else {
  71.                 error = CSS_INVALID;
  72.         }
  73.  
  74.         if (error != CSS_OK)
  75.                 *ctx = orig_ctx;
  76.        
  77.         return error;
  78. }
  79.  
  80.