1 // Protocol Buffers - Google's data interchange format
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30
31 // Author: kenton@google.com (Kenton Varda)
32
33 #include <google/protobuf/stubs/substitute.h>
34 #include <google/protobuf/stubs/strutil.h>
35 #include <google/protobuf/stubs/stl_util.h>
36
37 namespace google {
38 namespace protobuf {
39 namespace strings {
40
41 using internal::SubstituteArg;
42
43 // Returns the number of args in arg_array which were passed explicitly
44 // to Substitute().
CountSubstituteArgs(const SubstituteArg * const * args_array)45 static int CountSubstituteArgs(const SubstituteArg* const* args_array) {
46 int count = 0;
47 while (args_array[count] != NULL && args_array[count]->size() != -1) {
48 ++count;
49 }
50 return count;
51 }
52
Substitute(const char * format,const SubstituteArg & arg0,const SubstituteArg & arg1,const SubstituteArg & arg2,const SubstituteArg & arg3,const SubstituteArg & arg4,const SubstituteArg & arg5,const SubstituteArg & arg6,const SubstituteArg & arg7,const SubstituteArg & arg8,const SubstituteArg & arg9)53 string Substitute(
54 const char* format,
55 const SubstituteArg& arg0, const SubstituteArg& arg1,
56 const SubstituteArg& arg2, const SubstituteArg& arg3,
57 const SubstituteArg& arg4, const SubstituteArg& arg5,
58 const SubstituteArg& arg6, const SubstituteArg& arg7,
59 const SubstituteArg& arg8, const SubstituteArg& arg9) {
60 string result;
61 SubstituteAndAppend(&result, format, arg0, arg1, arg2, arg3, arg4,
62 arg5, arg6, arg7, arg8, arg9);
63 return result;
64 }
65
SubstituteAndAppend(string * output,const char * format,const SubstituteArg & arg0,const SubstituteArg & arg1,const SubstituteArg & arg2,const SubstituteArg & arg3,const SubstituteArg & arg4,const SubstituteArg & arg5,const SubstituteArg & arg6,const SubstituteArg & arg7,const SubstituteArg & arg8,const SubstituteArg & arg9)66 void SubstituteAndAppend(
67 string* output, const char* format,
68 const SubstituteArg& arg0, const SubstituteArg& arg1,
69 const SubstituteArg& arg2, const SubstituteArg& arg3,
70 const SubstituteArg& arg4, const SubstituteArg& arg5,
71 const SubstituteArg& arg6, const SubstituteArg& arg7,
72 const SubstituteArg& arg8, const SubstituteArg& arg9) {
73 const SubstituteArg* const args_array[] = {
74 &arg0, &arg1, &arg2, &arg3, &arg4, &arg5, &arg6, &arg7, &arg8, &arg9, NULL
75 };
76
77 // Determine total size needed.
78 int size = 0;
79 for (int i = 0; format[i] != '\0'; i++) {
80 if (format[i] == '$') {
81 if (ascii_isdigit(format[i+1])) {
82 int index = format[i+1] - '0';
83 if (args_array[index]->size() == -1) {
84 GOOGLE_LOG(DFATAL)
85 << "strings::Substitute format string invalid: asked for \"$"
86 << index << "\", but only " << CountSubstituteArgs(args_array)
87 << " args were given. Full format string was: \""
88 << CEscape(format) << "\".";
89 return;
90 }
91 size += args_array[index]->size();
92 ++i; // Skip next char.
93 } else if (format[i+1] == '$') {
94 ++size;
95 ++i; // Skip next char.
96 } else {
97 GOOGLE_LOG(DFATAL)
98 << "Invalid strings::Substitute() format string: \""
99 << CEscape(format) << "\".";
100 return;
101 }
102 } else {
103 ++size;
104 }
105 }
106
107 if (size == 0) return;
108
109 // Build the string.
110 int original_size = output->size();
111 STLStringResizeUninitialized(output, original_size + size);
112 char* target = string_as_array(output) + original_size;
113 for (int i = 0; format[i] != '\0'; i++) {
114 if (format[i] == '$') {
115 if (ascii_isdigit(format[i+1])) {
116 const SubstituteArg* src = args_array[format[i+1] - '0'];
117 memcpy(target, src->data(), src->size());
118 target += src->size();
119 ++i; // Skip next char.
120 } else if (format[i+1] == '$') {
121 *target++ = '$';
122 ++i; // Skip next char.
123 }
124 } else {
125 *target++ = format[i];
126 }
127 }
128
129 GOOGLE_DCHECK_EQ(target - output->data(), output->size());
130 }
131
132 } // namespace strings
133 } // namespace protobuf
134 } // namespace google
135