src/glsl/pp/sl_pp_extension.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include "sl_pp_context.h"
  31 #include "sl_pp_process.h"
  32 #include "sl_pp_public.h"
  33
  34
  35 int
  36 sl_pp_context_add_extension(struct sl_pp_context *context,
  37                             const char *name)
  38 {
  39    struct sl_pp_extension ext;
  40
  41    if (context->num_extensions == SL_PP_MAX_EXTENSIONS) {
  42       return -1;
  43    }
  44
  45    ext.name = sl_pp_context_add_unique_str(context, name);
  46    if (ext.name == -1) {
  47       return -1;
  48    }
  49
  50    context->extensions[context->num_extensions++] = ext;
  51    return 0;
  52 }
  53
  54 int
  55 sl_pp_process_extension(struct sl_pp_context *context,
  56                         const struct sl_pp_token_info *input,
  57                         unsigned int first,
  58                         unsigned int last,
  59                         struct sl_pp_process_state *state)
  60 {
  61    int extension_name = -1;
  62    int behavior = -1;
  63    struct sl_pp_token_info out;
  64
  65    /* Grab the extension name. */
  66    if (first < last && input[first].token == SL_PP_IDENTIFIER) {
  67       extension_name = input[first].data.identifier;
  68       first++;
  69    }
  70    if (extension_name == -1) {
  71       strcpy(context->error_msg, "expected identifier after `#extension'");
  72       return -1;
  73    }
  74
  75    /* Make sure the extension is supported. */
  76    if (extension_name == context->dict.all) {
  77       out.data.extension = extension_name;
  78    } else {
  79       unsigned int i;
  80
  81       out.data.extension = -1;
  82       for (i = 0; i < context->num_extensions; i++) {
  83          if (extension_name == context->extensions[i].name) {
  84             out.data.extension = extension_name;
  85             break;
  86          }
  87       }
  88    }
  89
  90    /* Grab the colon separating the extension name and behavior. */
  91    while (first < last && input[first].token == SL_PP_WHITESPACE) {
  92       first++;
  93    }
  94    if (first < last && input[first].token == SL_PP_COLON) {
  95       first++;
  96    } else {
  97       strcpy(context->error_msg, "expected `:' after extension name");
  98       return -1;
  99    }
 100    while (first < last && input[first].token == SL_PP_WHITESPACE) {
 101       first++;
 102    }
 103
 104    /* Grab the behavior name. */
 105    if (first < last && input[first].token == SL_PP_IDENTIFIER) {
 106       behavior = input[first].data.identifier;
 107       first++;
 108    }
 109    if (behavior == -1) {
 110       strcpy(context->error_msg, "expected identifier after `:'");
 111       return -1;
 112    }
 113
 114    if (behavior == context->dict.require) {
 115       if (out.data.extension == -1) {
 116          strcpy(context->error_msg, "the required extension is not supported");
 117          return -1;
 118       }
 119       if (out.data.extension == context->dict.all) {
 120          strcpy(context->error_msg, "invalid behavior for `all' extension: `require'");
 121          return -1;
 122       }
 123       out.token = SL_PP_EXTENSION_REQUIRE;
 124    } else if (behavior == context->dict.enable) {
 125       if (out.data.extension == -1) {
 126          /* Warning: the extension cannot be enabled. */
 127          return 0;
 128       }
 129       if (out.data.extension == context->dict.all) {
 130          strcpy(context->error_msg, "invalid behavior for `all' extension: `enable'");
 131          return -1;
 132       }
 133       out.token = SL_PP_EXTENSION_ENABLE;
 134    } else if (behavior == context->dict.warn) {
 135       if (out.data.extension == -1) {
 136          /* Warning: the extension is not supported. */
 137          return 0;
 138       }
 139       out.token = SL_PP_EXTENSION_WARN;
 140    } else if (behavior == context->dict.disable) {
 141       if (out.data.extension == -1) {
 142          /* Warning: the extension is not supported. */
 143          return 0;
 144       }
 145       out.token = SL_PP_EXTENSION_DISABLE;
 146    } else {
 147       strcpy(context->error_msg, "unrecognised behavior name");
 148       return -1;
 149    }
 150
 151    /* Grab the end of line. */
 152    while (first < last && input[first].token == SL_PP_WHITESPACE) {
 153       first++;
 154    }
 155    if (first < last) {
 156       strcpy(context->error_msg, "expected end of line after behavior name");
 157       return -1;
 158    }
 159
 160    if (sl_pp_process_out(state, &out)) {
 161       return -1;
 162    }
 163
 164    return 0;
 165 }