1 #ifdef FOSSIL_ENABLE_JSON
2 /*
3 ** Copyright (c) 2011 D. Richard Hipp
4 **
5 ** This program is free software; you can redistribute it and/or
6 ** modify it under the terms of the Simplified BSD License (also
7 ** known as the "2-Clause License" or "FreeBSD License".)
8 **
9 ** This program is distributed in the hope that it will be useful,
10 ** but without any warranty; without even the implied warranty of
11 ** merchantability or fitness for a particular purpose.
12 **
13 ** Author contact information:
14 ** drh@hwaci.com
15 ** http://www.hwaci.com/drh/
16 **
17 */
18
19 #include "config.h"
20 #include "json_diff.h"
21
22 #if INTERFACE
23 #include "json_detail.h"
24 #endif
25
26
27
28 /*
29 ** Generates a diff between two versions (zFrom and zTo), using nContext
30 ** content lines in the output. On success, returns a new JSON String
31 ** object. On error it sets g.json's error state and returns NULL.
32 **
33 ** If fSbs is true (non-0) them side-by-side diffs are used.
34 **
35 ** If fHtml is true then HTML markup is added to the diff.
36 */
json_generate_diff(const char * zFrom,const char * zTo,int nContext,char fSbs,char fHtml)37 cson_value * json_generate_diff(const char *zFrom, const char *zTo,
38 int nContext, char fSbs,
39 char fHtml){
40 int fromid;
41 int toid;
42 int outLen;
43 DiffConfig DCfg;
44 Blob from = empty_blob, to = empty_blob, out = empty_blob;
45 cson_value * rc = NULL;
46 int flags = (fSbs ? DIFF_SIDEBYSIDE : 0)
47 | (fHtml ? DIFF_HTML : 0);
48 fromid = name_to_typed_rid(zFrom, "*");
49 if(fromid<=0){
50 json_set_err(FSL_JSON_E_UNRESOLVED_UUID,
51 "Could not resolve 'from' ID.");
52 return NULL;
53 }
54 toid = name_to_typed_rid(zTo, "*");
55 if(toid<=0){
56 json_set_err(FSL_JSON_E_UNRESOLVED_UUID,
57 "Could not resolve 'to' ID.");
58 return NULL;
59 }
60 content_get(fromid, &from);
61 content_get(toid, &to);
62 blob_zero(&out);
63 diff_config_init(&DCfg, flags);
64 text_diff(&from, &to, &out, &DCfg);
65 blob_reset(&from);
66 blob_reset(&to);
67 outLen = blob_size(&out);
68 if(outLen>=0){
69 rc = cson_value_new_string(blob_buffer(&out),
70 (unsigned int)blob_size(&out));
71 }
72 blob_reset(&out);
73 return rc;
74 }
75
76 /*
77 ** Implementation of the /json/diff page.
78 **
79 ** Arguments:
80 **
81 ** v1=1st version to diff
82 ** v2=2nd version to diff
83 **
84 ** Can come from GET, POST.payload, CLI -v1/-v2 or as positional
85 ** parameters following the command name (in HTTP and CLI modes).
86 **
87 */
json_page_diff()88 cson_value * json_page_diff(){
89 cson_object * pay = NULL;
90 cson_value * v = NULL;
91 char const * zFrom;
92 char const * zTo;
93 int nContext = 0;
94 char doSBS;
95 char doHtml;
96 if(!g.perm.Read){
97 json_set_err(FSL_JSON_E_DENIED,
98 "Requires 'o' permissions.");
99 return NULL;
100 }
101 zFrom = json_find_option_cstr("v1",NULL,NULL);
102 if(!zFrom){
103 zFrom = json_command_arg(2);
104 }
105 if(!zFrom){
106 json_set_err(FSL_JSON_E_MISSING_ARGS,
107 "Required 'v1' parameter is missing.");
108 return NULL;
109 }
110 zTo = json_find_option_cstr("v2",NULL,NULL);
111 if(!zTo){
112 zTo = json_command_arg(3);
113 }
114 if(!zTo){
115 json_set_err(FSL_JSON_E_MISSING_ARGS,
116 "Required 'v2' parameter is missing.");
117 return NULL;
118 }
119 nContext = json_find_option_int("context",NULL,"c",5);
120 doSBS = json_find_option_bool("sbs",NULL,"y",0);
121 doHtml = json_find_option_bool("html",NULL,"h",0);
122 v = json_generate_diff(zFrom, zTo, nContext, doSBS, doHtml);
123 if(!v){
124 if(!g.json.resultCode){
125 json_set_err(FSL_JSON_E_UNKNOWN,
126 "Generating diff failed for unknown reason.");
127 }
128 return NULL;
129 }
130 pay = cson_new_object();
131 cson_object_set(pay, "from", json_new_string(zFrom));
132 cson_object_set(pay, "to", json_new_string(zTo));
133 cson_object_set(pay, "diff", v);
134 v = 0;
135
136 return pay ? cson_object_value(pay) : NULL;
137 }
138
139 #endif /* FOSSIL_ENABLE_JSON */
140