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+From: Peter Feigl <craven@gmx.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH 1/3] Adding an S-expression structured output printer.\r
+Date: Fri, 30 Nov 2012 09:29:01 +0100\r
+Message-Id: <1354264143-30173-1-git-send-email-craven@gmx.net>\r
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+\r
+This commit adds an sprinter for Lisp S-Expressions. Later commits will\r
+use this printer.\r
+\r
+The structure is the same as json, but:\r
+- arrays are written as lists: ("foo" "bar" "baaz" 1 2 3)\r
+- maps are written as a-lists: ((key "value") (other-key "other-value"))\r
+- true is written as t\r
+- false is written as nil\r
+- null is written as nil\r
+---\r
+ Makefile.local | 1 +\r
+ sprinter-sexp.c | 235 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++\r
+ 2 files changed, 236 insertions(+)\r
+ create mode 100644 sprinter-sexp.c\r
+\r
+diff --git a/Makefile.local b/Makefile.local\r
+index 2b91946..0db1713 100644\r
+--- a/Makefile.local\r
++++ b/Makefile.local\r
+@@ -270,6 +270,7 @@ notmuch_client_srcs = \\r
+ notmuch-tag.c \\r
+ notmuch-time.c \\r
+ sprinter-json.c \\r
++ sprinter-sexp.c \\r
+ sprinter-text.c \\r
+ query-string.c \\r
+ mime-node.c \\r
+diff --git a/sprinter-sexp.c b/sprinter-sexp.c\r
+new file mode 100644\r
+index 0000000..8401c52\r
+--- /dev/null\r
++++ b/sprinter-sexp.c\r
+@@ -0,0 +1,235 @@\r
++#include <stdbool.h>\r
++#include <stdio.h>\r
++#include <talloc.h>\r
++#include "sprinter.h"\r
++\r
++struct sprinter_sexp {\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 sexp_state *state;\r
++\r
++ /* A flag to signify that a separator should be inserted in the\r
++ * output as soon as possible.\r
++ */\r
++ notmuch_bool_t insert_separator;\r
++};\r
++\r
++struct sexp_state {\r
++ struct sexp_state *parent;\r
++\r
++ /* True if nothing has been printed in this aggregate yet.\r
++ * Suppresses the space before a value. */\r
++ notmuch_bool_t first;\r
++\r
++ /* True if the state is a map state.\r
++ Used to add a space between key/value pairs. */\r
++ notmuch_bool_t in_map;\r
++\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 space. */\r
++static struct sprinter_sexp *\r
++sexp_begin_value (struct sprinter *sp)\r
++{\r
++ struct sprinter_sexp *sps = (struct sprinter_sexp *) sp;\r
++\r
++ if (sps->state) {\r
++ if (! sps->state->first) {\r
++ if (sps->insert_separator) {\r
++ fputc ('\n', sps->stream);\r
++ sps->insert_separator = FALSE;\r
++ } else {\r
++ if( ! sps->state->in_map)\r
++ fputc (' ', sps->stream);\r
++ }\r
++ } else {\r
++ sps->state->first = FALSE;\r
++ }\r
++ }\r
++ return sps;\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
++sexp_begin_aggregate (struct sprinter *sp, char open, char close)\r
++{\r
++ struct sprinter_sexp *sps = sexp_begin_value (sp);\r
++ struct sexp_state *state = talloc (sps, struct sexp_state);\r
++ fputc (open, sps->stream);\r
++ state->parent = sps->state;\r
++ state->first = TRUE;\r
++ state->in_map = FALSE;\r
++ state->close = close;\r
++ sps->state = state;\r
++}\r
++\r
++static void\r
++sexp_begin_map (struct sprinter *sp)\r
++{\r
++ struct sprinter_sexp *sps = (struct sprinter_sexp *) sp;\r
++ sexp_begin_aggregate (sp, '(', ')');\r
++ sps->state->in_map = TRUE;\r
++}\r
++\r
++static void\r
++sexp_begin_list (struct sprinter *sp)\r
++{\r
++ sexp_begin_aggregate (sp, '(', ')');\r
++}\r
++\r
++static void\r
++sexp_end (struct sprinter *sp)\r
++{\r
++ struct sprinter_sexp *sps = (struct sprinter_sexp *) sp;\r
++ struct sexp_state *state = sps->state;\r
++\r
++ if (sps->state->in_map)\r
++ fputc (')', sps->stream);\r
++ fputc (sps->state->close, sps->stream);\r
++ sps->state = state->parent;\r
++ talloc_free (state);\r
++ if (sps->state == NULL)\r
++ fputc ('\n', sps->stream);\r
++}\r
++\r
++/* This implementation supports embedded NULs as allowed by the JSON\r
++ * specification and Unicode. Support for *parsing* embedded NULs\r
++ * varies, but is generally not a problem outside of C-based parsers\r
++ * (Python's json module and Emacs' json.el take embedded NULs in\r
++ * stride). */\r
++static void\r
++sexp_string_len_internal (struct sprinter *sp, const char *val, size_t len, notmuch_bool_t quote)\r
++{\r
++ static const char *const escapes[] = {\r
++ ['\"'] = "\\\"", ['\\'] = "\\\\", ['\b'] = "\\b",\r
++ ['\f'] = "\\f", ['\n'] = "\\n", ['\t'] = "\\t"\r
++ };\r
++ struct sprinter_sexp *sps = sexp_begin_value (sp);\r
++\r
++ if(quote)\r
++ fputc ('"', sps->stream);\r
++ for (; len; ++val, --len) {\r
++ unsigned char ch = *val;\r
++ if (ch < ARRAY_SIZE (escapes) && escapes[ch])\r
++ fputs (escapes[ch], sps->stream);\r
++ else if (ch >= 32)\r
++ fputc (ch, sps->stream);\r
++ else\r
++ fprintf (sps->stream, "\\u%04x", ch);\r
++ }\r
++ if(quote)\r
++ fputc ('"', sps->stream);\r
++}\r
++\r
++static void\r
++sexp_string_len (struct sprinter *sp, const char *val, size_t len)\r
++{\r
++ sexp_string_len_internal (sp, val, len, TRUE); /* print quoted */\r
++}\r
++\r
++static void\r
++sexp_symbol_len (struct sprinter *sp, const char *val, size_t len)\r
++{\r
++ sexp_string_len_internal (sp, val, len, FALSE); /* print unquoted */\r
++}\r
++\r
++static void\r
++sexp_string (struct sprinter *sp, const char *val)\r
++{\r
++ if (val == NULL)\r
++ val = "";\r
++ sexp_string_len (sp, val, strlen (val));\r
++}\r
++\r
++static void\r
++sexp_symbol (struct sprinter *sp, const char *val)\r
++{\r
++ if (val == NULL)\r
++ val = "";\r
++ sexp_symbol_len (sp, val, strlen (val));\r
++}\r
++\r
++static void\r
++sexp_integer (struct sprinter *sp, int val)\r
++{\r
++ struct sprinter_sexp *sps = sexp_begin_value (sp);\r
++\r
++ fprintf (sps->stream, "%d", val);\r
++}\r
++\r
++static void\r
++sexp_boolean (struct sprinter *sp, notmuch_bool_t val)\r
++{\r
++ struct sprinter_sexp *sps = sexp_begin_value (sp);\r
++\r
++ fputs (val ? "t" : "nil", sps->stream);\r
++}\r
++\r
++static void\r
++sexp_null (struct sprinter *sp)\r
++{\r
++ struct sprinter_sexp *sps = sexp_begin_value (sp);\r
++\r
++ fputs ("nil", sps->stream);\r
++}\r
++\r
++static void\r
++sexp_map_key (struct sprinter *sp, const char *key)\r
++{\r
++ struct sprinter_sexp *sps = (struct sprinter_sexp *) sp;\r
++\r
++ if( sps->state->in_map && ! sps->state->first)\r
++ fputs (") ", sps->stream);\r
++ fputc ('(', sps->stream);\r
++ sexp_symbol (sp, key);\r
++ fputc (' ', sps->stream);\r
++}\r
++\r
++static void\r
++sexp_set_prefix (unused (struct sprinter *sp), unused (const char *name))\r
++{\r
++}\r
++\r
++static void\r
++sexp_separator (struct sprinter *sp)\r
++{\r
++ struct sprinter_sexp *sps = (struct sprinter_sexp *) sp;\r
++\r
++ sps->insert_separator = TRUE;\r
++}\r
++\r
++struct sprinter *\r
++sprinter_sexp_create (const void *ctx, FILE *stream)\r
++{\r
++ static const struct sprinter_sexp template = {\r
++ .vtable = {\r
++ .begin_map = sexp_begin_map,\r
++ .begin_list = sexp_begin_list,\r
++ .end = sexp_end,\r
++ .string = sexp_string,\r
++ .string_len = sexp_string_len,\r
++ .integer = sexp_integer,\r
++ .boolean = sexp_boolean,\r
++ .null = sexp_null,\r
++ .map_key = sexp_map_key,\r
++ .separator = sexp_separator,\r
++ .set_prefix = sexp_set_prefix,\r
++ .is_text_printer = FALSE,\r
++ }\r
++ };\r
++ struct sprinter_sexp *res;\r
++\r
++ res = talloc (ctx, struct sprinter_sexp);\r
++ if (! res)\r
++ return NULL;\r
++\r
++ *res = template;\r
++ res->stream = stream;\r
++ return &res->vtable;\r
++}\r
+-- \r
+1.8.0\r
+\r
projects / notmuch-archives.git / commitdiff