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+From: <craven@gmx.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH v4 2/3] Add structured output formatter for JSON.\r
+Date: Thu, 12 Jul 2012 09:43:23 +0200\r
+Message-Id: <1342079004-5300-3-git-send-email-craven@gmx.net>\r
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+References: <87d34hsdx8.fsf@awakening.csail.mit.edu>\r
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+\r
+Using the new structured printer support in sprinter.h, implement\r
+sprinter_json_new, which returns a new JSON structured output\r
+formatter.\r
+\r
+The formatter prints output similar to the existing JSON, but with\r
+differences in whitespace (mostly newlines).\r
+---\r
+ Makefile.local | 1 +\r
+ sprinter.c | 172 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++\r
+ 2 files changed, 173 insertions(+)\r
+ create mode 100644 sprinter.c\r
+\r
+diff --git a/Makefile.local b/Makefile.local\r
+index a890df2..8baf0c2 100644\r
+--- a/Makefile.local\r
++++ b/Makefile.local\r
+@@ -290,6 +290,7 @@ notmuch_client_srcs = \\r
+ notmuch-show.c \\r
+ notmuch-tag.c \\r
+ notmuch-time.c \\r
++ sprinter.c \\r
+ query-string.c \\r
+ mime-node.c \\r
+ crypto.c \\r
+diff --git a/sprinter.c b/sprinter.c\r
+new file mode 100644\r
+index 0000000..649f79a\r
+--- /dev/null\r
++++ b/sprinter.c\r
+@@ -0,0 +1,172 @@\r
++#include <stdbool.h>\r
++#include <stdio.h>\r
++#include <talloc.h>\r
++#include "sprinter.h"\r
++\r
++#define ARRAY_SIZE(arr) (sizeof (arr) / sizeof (arr[0]))\r
++\r
++struct sprinter *\r
++sprinter_text = NULL;\r
++\r
++/*\r
++ * Every below here is the implementation of the JSON printer.\r
++ */\r
++\r
++struct sprinter_json\r
++{\r
++ struct sprinter vtable;\r
++ FILE *stream;\r
++ /* Top of the state stack, or NULL if the printer is not currently\r
++ * inside any aggregate types. */\r
++ struct json_state *state;\r
++};\r
++\r
++struct json_state\r
++{\r
++ struct json_state *parent;\r
++ /* True if nothing has been printed in this aggregate yet.\r
++ * Suppresses the comma before a value. */\r
++ notmuch_bool_t first;\r
++ /* The character that closes the current aggregate. */\r
++ char close;\r
++};\r
++\r
++/* Helper function to set up the stream to print a value. If this\r
++ * value follows another value, prints a comma. */\r
++static struct sprinter_json *\r
++json_begin_value(struct sprinter *sp)\r
++{\r
++ struct sprinter_json *spj = (struct sprinter_json*)sp;\r
++ if (spj->state) {\r
++ if (!spj->state->first)\r
++ fputs (", ", spj->stream);\r
++ else\r
++ spj->state->first = false;\r
++ }\r
++ return spj;\r
++}\r
++\r
++/* Helper function to begin an aggregate type. Prints the open\r
++ * character and pushes a new state frame. */\r
++static void\r
++json_begin_aggregate(struct sprinter *sp, char open, char close)\r
++{\r
++ struct sprinter_json *spj = json_begin_value (sp);\r
++ struct json_state *state = talloc (spj, struct json_state);\r
++\r
++ fputc (open, spj->stream);\r
++ state->parent = spj->state;\r
++ state->first = true;\r
++ state->close = close;\r
++ spj->state = state;\r
++}\r
++\r
++static void\r
++json_begin_map(struct sprinter *sp)\r
++{\r
++ json_begin_aggregate (sp, '{', '}');\r
++}\r
++\r
++static void\r
++json_begin_list(struct sprinter *sp)\r
++{\r
++ json_begin_aggregate (sp, '[', ']');\r
++}\r
++\r
++static void\r
++json_end(struct sprinter *sp)\r
++{\r
++ struct sprinter_json *spj = (struct sprinter_json*)sp;\r
++ struct json_state *state = spj->state;\r
++\r
++ fputc (spj->state->close, spj->stream);\r
++ spj->state = state->parent;\r
++ talloc_free (state);\r
++ if(spj->state == NULL)\r
++ fputc ('\n', spj->stream);\r
++}\r
++\r
++static void\r
++json_string(struct sprinter *sp, const char *val)\r
++{\r
++ static const char * const escapes[] = {\r
++ ['\"'] = "\\\"", ['\\'] = "\\\\", ['\b'] = "\\b",\r
++ ['\f'] = "\\f", ['\n'] = "\\n", ['\t'] = "\\t"\r
++ };\r
++ struct sprinter_json *spj = json_begin_value (sp);\r
++ fputc ('"', spj->stream);\r
++ for (; *val; ++val) {\r
++ unsigned char ch = *val;\r
++ if (ch < ARRAY_SIZE(escapes) && escapes[ch])\r
++ fputs (escapes[ch], spj->stream);\r
++ else if (ch >= 32)\r
++ fputc (ch, spj->stream);\r
++ else\r
++ fprintf (spj->stream, "\\u%04x", ch);\r
++ }\r
++ fputc ('"', spj->stream);\r
++}\r
++\r
++static void\r
++json_integer(struct sprinter *sp, int val)\r
++{\r
++ struct sprinter_json *spj = json_begin_value (sp);\r
++ fprintf (spj->stream, "%d", val);\r
++}\r
++\r
++static void\r
++json_boolean(struct sprinter *sp, notmuch_bool_t val)\r
++{\r
++ struct sprinter_json *spj = json_begin_value (sp);\r
++ fputs (val ? "true" : "false", spj->stream);\r
++}\r
++\r
++static void\r
++json_null(struct sprinter *sp)\r
++{\r
++ struct sprinter_json *spj = json_begin_value (sp);\r
++ fputs ("null", spj->stream);\r
++}\r
++\r
++static void\r
++json_map_key(struct sprinter *sp, const char *key)\r
++{\r
++ struct sprinter_json *spj = (struct sprinter_json*)sp;\r
++ json_string (sp, key);\r
++ fputs (": ", spj->stream);\r
++ spj->state->first = true;\r
++}\r
++\r
++static void\r
++json_frame(struct sprinter *sp)\r
++{\r
++ struct sprinter_json *spj = (struct sprinter_json*)sp;\r
++ fputc ('\n', spj->stream);\r
++}\r
++\r
++struct sprinter *\r
++sprinter_json_new(const void *ctx, FILE *stream)\r
++{\r
++ static const struct sprinter_json template = {\r
++ .vtable = {\r
++ .begin_map = json_begin_map,\r
++ .begin_list = json_begin_list,\r
++ .end = json_end,\r
++ .string = json_string,\r
++ .integer = json_integer,\r
++ .boolean = json_boolean,\r
++ .null = json_null,\r
++ .map_key = json_map_key,\r
++ .frame = json_frame,\r
++ }\r
++ };\r
++ struct sprinter_json *res;\r
++\r
++ res = talloc (ctx, struct sprinter_json);\r
++ if (!res)\r
++ return NULL;\r
++\r
++ *res = template;\r
++ res->stream = stream;\r
++ return &res->vtable;\r
++}\r
+-- \r
+1.7.11.1\r
+\r
projects / notmuch-archives.git / commitdiff