gbranden pushed a commit to branch master
in repository groff.
commit de62829ca4ce5a8d84a76393f43fbd9bf890f3e9
Author: G. Branden Robinson <[email protected]>
AuthorDate: Tue Mar 4 04:30:10 2025 -0600
[libgroff]: Support object dumping in JSON (3/3).
Support JSON dumping of `symbol`s.
Add `json_length()`, `json_extract()`, and `json_dump()` public member
functions to `symbol` class. The enhanced node printing feature will
require them.
* src/include/symbol.h (class symbol): Declare them.
* src/libs/libgroff/symbol.cpp (symbol::json_length):
(symbol::json_extract, symbol::json_dump): Implement them.
---
ChangeLog | 10 ++++++
src/include/symbol.h | 3 ++
src/libs/libgroff/symbol.cpp | 80 +++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 92 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog
index 5480dee2a..c7512f7f4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2025-03-04 G. Branden Robinson <[email protected]>
+
+ [libgroff]: Add `json_length()`, `json_extract()`, and
+ `json_dump()` public member functions to `symbol` class. The
+ enhanced node printing feature will require them.
+
+ * src/include/symbol.h (class symbol): Declare them.
+ * src/libs/libgroff/symbol.cpp (symbol::json_length):
+ (symbol::json_extract, symbol::json_dump): Implement them.
+
2025-03-04 G. Branden Robinson <[email protected]>
[libgroff]: Add `json_length()`, `json_extract()`, and
diff --git a/src/include/symbol.h b/src/include/symbol.h
index d82d7cd29..ef8805354 100644
--- a/src/include/symbol.h
+++ b/src/include/symbol.h
@@ -38,6 +38,9 @@ public:
const char *contents() const;
bool is_null() const;
bool is_empty() const;
+ size_t json_length() const;
+ const char *json_extract() const;
+ void json_dump() const;
};
diff --git a/src/libs/libgroff/symbol.cpp b/src/libs/libgroff/symbol.cpp
index 7bc8a8f4c..1ed91f359 100644
--- a/src/libs/libgroff/symbol.cpp
+++ b/src/libs/libgroff/symbol.cpp
@@ -1,4 +1,4 @@
-/* Copyright (C) 1989-2024 Free Software Foundation, Inc.
+/* Copyright (C) 1989-2025 Free Software Foundation, Inc.
Written by James Clark ([email protected])
This file is part of groff.
@@ -22,7 +22,10 @@ along with this program. If not, see
<http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <string.h> // strcat(), strcmp(), strcpy(), strlen()
+#include <stdlib.h> // calloc()
+#include "cset.h" // csprint()
+#include "json-encode.h" // json_encode_char()
#include "lib.h"
#include "errarg.h"
@@ -160,6 +163,81 @@ symbol concat(symbol s1, symbol s2)
return res;
}
+// Compute length of JSON representation of object.
+size_t symbol::json_length() const
+{
+ size_t len = 0;
+ const char *p = s;
+ char ch;
+ int nextrachars = 2; // leading and trailing double quotes
+ for (size_t i = 0; p[i] != '\0'; i++, len++) {
+ ch = p[i];
+ // Handle the most common cases first.
+ if (ch < 128) {
+ if (csprint(ch))
+ ;
+ else
+ switch (ch) {
+ case '"':
+ case '\\':
+ case '/':
+ case '\b':
+ case '\f':
+ case '\n':
+ case '\r':
+ case '\t':
+ nextrachars++;
+ break;
+ default:
+ nextrachars += 5;
+ }
+ }
+ else
+ nextrachars += 5;
+ }
+ return (len + nextrachars);
+}
+
+// Like `extract()`, but double-quote the string and escape characters
+// per JSON. (Unlike groff's `string`, a `symbol` doesn't contain
+// embedded null characters.) This string is not null-terminated!
+// Caller MUST use .json_length(). (The member variable backing us up
+// _is_ a null-terminated C string.)
+const char *symbol::json_extract() const
+{
+ const char *p = s;
+ size_t n = strlen(s);
+ size_t i;
+ char *q = static_cast<char *>(calloc(this->json_length(),
+ sizeof (char)));
+ if (q != 0 /* nullptr */) {
+ char *r = q;
+ *r++ = '"';
+ json_char ch;
+ for (i = 0; i < n; i++, p++) {
+ ch = json_encode_char(*p);
+ for (size_t j = 0; j < ch.len; j++)
+ *r++ = ch.buf[j];
+ }
+ *r++ = '"';
+ }
+ else
+ return strdup("\"\""); // so it can be free()d
+ return q;
+}
+
+// Dump symbol in JSON representation to standard error stream.
+void symbol::json_dump() const
+{
+ const char *repr = this->json_extract();
+ size_t jsonlen = this->json_length();
+ // Write it out by character to keep libc string functions from
+ // interpreting escape sequences.
+ for (size_t i = 0; i < jsonlen; i++)
+ fputc(repr[i], stderr);
+ free(const_cast<char *>(repr));
+}
+
symbol default_symbol("default");
// Local Variables:
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