git.ozlabs.org Git - ccan/blob - ccan/graphql/_info

   1 #include "config.h"
   2 #include <stdio.h>
   3 #include <string.h>
   4
   5 /**
   6  * graphql - Routines to lex and parse GraphQL.
   7  *
   8  * This code contains routines to lex and parse GraphQL code.
   9  * This code was written per the spec at:
  10  *    https://spec.graphql.org/draft/
  11  * ...dated Fri, May 21, 2021 at the time of writing.
  12  *    Copyright (c) 2021 WhiteCloudFarm.org <robert.lee.dickinson@gmail.com>
  13  *    <https://github.com/rl-d/ccan>
  14  *
  15  * Example:
  16  *      #include <stdio.h>
  17  *      #include "ccan/graphql/graphql.h"
  18  *
  19  *      int main(int argc, char *argv[])
  20  *
  21  *              const char *input_string = "{ fieldName }";
  22  *              struct list_head *output_tokens;
  23  *              struct graphql_executable_document *output_document;
  24  *
  25  *              const char *errmsg = graphql_lexparse(
  26  *                      input_string,
  27  *                      NULL, // tal context
  28  *                      &output_tokens, // variable to receive tokens
  29  *                      &output_document); // variable to receive AST
  30  *
  31  *              if (errmsg) {
  32  *                      struct graphql_token *last_token;
  33  *                      last_token = list_tail(output_tokens, struct graphql_token, list);
  34  *                      printf("Line %d, col %d: %s",
  35  *                              last_token->source_line,
  36  *                              last_token->source_column + last_token->source_len,
  37  *                              errmsg);
  38  *              } else {
  39  *                      // Normally you would check every indirection in the resulting AST for null
  40  *                      // pointers, but for simplicity of example:
  41  *                      printf("A field from the parsed string: %s\n",
  42  *                              output_document->first_def->op_def->sel_set->
  43  *                              first->field->name->token_string);
  44  *              }
  45  *
  46  *              output_tokens = tal_free(output_tokens);
  47  *      }
  48  *
  49  * License: BSD-MIT
  50  */
  51 int main(int argc, char *argv[])
  52 {
  53         /* Expect exactly one argument */
  54         if (argc != 2)
  55                 return 1;
  56
  57         if (strcmp(argv[1], "depends") == 0) {
  58                 printf("ccan/list\n");
  59                 printf("ccan/take\n");
  60                 printf("ccan/tal\n");
  61                 printf("ccan/tal/str\n");
  62                 printf("ccan/utf8\n");
  63                 return 0;
  64         }
  65
  66         return 1;
  67 }
  68