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414 lines
8.5 KiB
414 lines
8.5 KiB
#include "cache.h" |
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#include "json-writer.h" |
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void jw_init(struct json_writer *jw) |
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{ |
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strbuf_init(&jw->json, 0); |
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strbuf_init(&jw->open_stack, 0); |
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jw->need_comma = 0; |
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jw->pretty = 0; |
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} |
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void jw_release(struct json_writer *jw) |
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{ |
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strbuf_release(&jw->json); |
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strbuf_release(&jw->open_stack); |
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} |
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/* |
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* Append JSON-quoted version of the given string to 'out'. |
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*/ |
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static void append_quoted_string(struct strbuf *out, const char *in) |
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{ |
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unsigned char c; |
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strbuf_addch(out, '"'); |
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while ((c = *in++) != '\0') { |
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if (c == '"') |
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strbuf_addstr(out, "\\\""); |
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else if (c == '\\') |
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strbuf_addstr(out, "\\\\"); |
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else if (c == '\n') |
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strbuf_addstr(out, "\\n"); |
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else if (c == '\r') |
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strbuf_addstr(out, "\\r"); |
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else if (c == '\t') |
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strbuf_addstr(out, "\\t"); |
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else if (c == '\f') |
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strbuf_addstr(out, "\\f"); |
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else if (c == '\b') |
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strbuf_addstr(out, "\\b"); |
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else if (c < 0x20) |
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strbuf_addf(out, "\\u%04x", c); |
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else |
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strbuf_addch(out, c); |
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} |
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strbuf_addch(out, '"'); |
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} |
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static void indent_pretty(struct json_writer *jw) |
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{ |
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int k; |
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for (k = 0; k < jw->open_stack.len; k++) |
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strbuf_addstr(&jw->json, " "); |
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} |
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/* |
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* Begin an object or array (either top-level or nested within the currently |
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* open object or array). |
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*/ |
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static void begin(struct json_writer *jw, char ch_open, int pretty) |
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{ |
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jw->pretty = pretty; |
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strbuf_addch(&jw->json, ch_open); |
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strbuf_addch(&jw->open_stack, ch_open); |
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jw->need_comma = 0; |
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} |
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/* |
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* Assert that the top of the open-stack is an object. |
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*/ |
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static void assert_in_object(const struct json_writer *jw, const char *key) |
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{ |
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if (!jw->open_stack.len) |
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BUG("json-writer: object: missing jw_object_begin(): '%s'", key); |
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if (jw->open_stack.buf[jw->open_stack.len - 1] != '{') |
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BUG("json-writer: object: not in object: '%s'", key); |
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} |
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/* |
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* Assert that the top of the open-stack is an array. |
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*/ |
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static void assert_in_array(const struct json_writer *jw) |
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{ |
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if (!jw->open_stack.len) |
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BUG("json-writer: array: missing jw_array_begin()"); |
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if (jw->open_stack.buf[jw->open_stack.len - 1] != '[') |
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BUG("json-writer: array: not in array"); |
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} |
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/* |
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* Add comma if we have already seen a member at this level. |
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*/ |
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static void maybe_add_comma(struct json_writer *jw) |
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{ |
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if (jw->need_comma) |
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strbuf_addch(&jw->json, ','); |
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else |
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jw->need_comma = 1; |
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} |
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static void fmt_double(struct json_writer *jw, int precision, |
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double value) |
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{ |
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if (precision < 0) { |
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strbuf_addf(&jw->json, "%f", value); |
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} else { |
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struct strbuf fmt = STRBUF_INIT; |
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strbuf_addf(&fmt, "%%.%df", precision); |
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strbuf_addf(&jw->json, fmt.buf, value); |
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strbuf_release(&fmt); |
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} |
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} |
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static void object_common(struct json_writer *jw, const char *key) |
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{ |
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assert_in_object(jw, key); |
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maybe_add_comma(jw); |
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if (jw->pretty) { |
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strbuf_addch(&jw->json, '\n'); |
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indent_pretty(jw); |
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} |
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append_quoted_string(&jw->json, key); |
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strbuf_addch(&jw->json, ':'); |
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if (jw->pretty) |
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strbuf_addch(&jw->json, ' '); |
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} |
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static void array_common(struct json_writer *jw) |
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{ |
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assert_in_array(jw); |
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maybe_add_comma(jw); |
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if (jw->pretty) { |
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strbuf_addch(&jw->json, '\n'); |
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indent_pretty(jw); |
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} |
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} |
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/* |
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* Assert that the given JSON object or JSON array has been properly |
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* terminated. (Has closing bracket.) |
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*/ |
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static void assert_is_terminated(const struct json_writer *jw) |
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{ |
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if (jw->open_stack.len) |
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BUG("json-writer: object: missing jw_end(): '%s'", |
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jw->json.buf); |
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} |
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void jw_object_begin(struct json_writer *jw, int pretty) |
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{ |
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begin(jw, '{', pretty); |
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} |
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void jw_object_string(struct json_writer *jw, const char *key, const char *value) |
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{ |
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object_common(jw, key); |
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append_quoted_string(&jw->json, value); |
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} |
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void jw_object_intmax(struct json_writer *jw, const char *key, intmax_t value) |
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{ |
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object_common(jw, key); |
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strbuf_addf(&jw->json, "%"PRIdMAX, value); |
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} |
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void jw_object_double(struct json_writer *jw, const char *key, int precision, |
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double value) |
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{ |
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object_common(jw, key); |
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fmt_double(jw, precision, value); |
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} |
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void jw_object_true(struct json_writer *jw, const char *key) |
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{ |
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object_common(jw, key); |
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strbuf_addstr(&jw->json, "true"); |
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} |
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void jw_object_false(struct json_writer *jw, const char *key) |
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{ |
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object_common(jw, key); |
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strbuf_addstr(&jw->json, "false"); |
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} |
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void jw_object_bool(struct json_writer *jw, const char *key, int value) |
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{ |
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if (value) |
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jw_object_true(jw, key); |
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else |
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jw_object_false(jw, key); |
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} |
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void jw_object_null(struct json_writer *jw, const char *key) |
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{ |
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object_common(jw, key); |
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strbuf_addstr(&jw->json, "null"); |
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} |
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static void increase_indent(struct strbuf *sb, |
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const struct json_writer *jw, |
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int indent) |
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{ |
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int k; |
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strbuf_reset(sb); |
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for (k = 0; k < jw->json.len; k++) { |
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char ch = jw->json.buf[k]; |
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strbuf_addch(sb, ch); |
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if (ch == '\n') |
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strbuf_addchars(sb, ' ', indent); |
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} |
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} |
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static void kill_indent(struct strbuf *sb, |
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const struct json_writer *jw) |
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{ |
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int k; |
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int eat_it = 0; |
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strbuf_reset(sb); |
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for (k = 0; k < jw->json.len; k++) { |
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char ch = jw->json.buf[k]; |
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if (eat_it && ch == ' ') |
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continue; |
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if (ch == '\n') { |
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eat_it = 1; |
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continue; |
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} |
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eat_it = 0; |
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strbuf_addch(sb, ch); |
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} |
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} |
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static void append_sub_jw(struct json_writer *jw, |
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const struct json_writer *value) |
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{ |
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/* |
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* If both are pretty, increase the indentation of the sub_jw |
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* to better fit under the super. |
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* |
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* If the super is pretty, but the sub_jw is compact, leave the |
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* sub_jw compact. (We don't want to parse and rebuild the sub_jw |
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* for this debug-ish feature.) |
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* |
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* If the super is compact, and the sub_jw is pretty, convert |
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* the sub_jw to compact. |
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* |
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* If both are compact, keep the sub_jw compact. |
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*/ |
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if (jw->pretty && jw->open_stack.len && value->pretty) { |
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struct strbuf sb = STRBUF_INIT; |
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increase_indent(&sb, value, jw->open_stack.len * 2); |
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strbuf_addbuf(&jw->json, &sb); |
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strbuf_release(&sb); |
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return; |
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} |
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if (!jw->pretty && value->pretty) { |
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struct strbuf sb = STRBUF_INIT; |
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kill_indent(&sb, value); |
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strbuf_addbuf(&jw->json, &sb); |
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strbuf_release(&sb); |
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return; |
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} |
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strbuf_addbuf(&jw->json, &value->json); |
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} |
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/* |
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* Append existing (properly terminated) JSON sub-data (object or array) |
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* as-is onto the given JSON data. |
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*/ |
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void jw_object_sub_jw(struct json_writer *jw, const char *key, |
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const struct json_writer *value) |
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{ |
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assert_is_terminated(value); |
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object_common(jw, key); |
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append_sub_jw(jw, value); |
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} |
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void jw_object_inline_begin_object(struct json_writer *jw, const char *key) |
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{ |
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object_common(jw, key); |
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jw_object_begin(jw, jw->pretty); |
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} |
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void jw_object_inline_begin_array(struct json_writer *jw, const char *key) |
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{ |
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object_common(jw, key); |
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jw_array_begin(jw, jw->pretty); |
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} |
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void jw_array_begin(struct json_writer *jw, int pretty) |
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{ |
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begin(jw, '[', pretty); |
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} |
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void jw_array_string(struct json_writer *jw, const char *value) |
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{ |
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array_common(jw); |
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append_quoted_string(&jw->json, value); |
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} |
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void jw_array_intmax(struct json_writer *jw, intmax_t value) |
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{ |
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array_common(jw); |
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strbuf_addf(&jw->json, "%"PRIdMAX, value); |
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} |
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void jw_array_double(struct json_writer *jw, int precision, double value) |
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{ |
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array_common(jw); |
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fmt_double(jw, precision, value); |
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} |
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void jw_array_true(struct json_writer *jw) |
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{ |
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array_common(jw); |
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strbuf_addstr(&jw->json, "true"); |
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} |
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void jw_array_false(struct json_writer *jw) |
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{ |
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array_common(jw); |
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strbuf_addstr(&jw->json, "false"); |
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} |
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void jw_array_bool(struct json_writer *jw, int value) |
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{ |
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if (value) |
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jw_array_true(jw); |
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else |
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jw_array_false(jw); |
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} |
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void jw_array_null(struct json_writer *jw) |
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{ |
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array_common(jw); |
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strbuf_addstr(&jw->json, "null"); |
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} |
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void jw_array_sub_jw(struct json_writer *jw, const struct json_writer *value) |
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{ |
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assert_is_terminated(value); |
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array_common(jw); |
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append_sub_jw(jw, value); |
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} |
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void jw_array_argc_argv(struct json_writer *jw, int argc, const char **argv) |
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{ |
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int k; |
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for (k = 0; k < argc; k++) |
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jw_array_string(jw, argv[k]); |
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} |
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void jw_array_argv(struct json_writer *jw, const char **argv) |
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{ |
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while (*argv) |
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jw_array_string(jw, *argv++); |
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} |
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void jw_array_inline_begin_object(struct json_writer *jw) |
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{ |
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array_common(jw); |
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jw_object_begin(jw, jw->pretty); |
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} |
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void jw_array_inline_begin_array(struct json_writer *jw) |
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{ |
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array_common(jw); |
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jw_array_begin(jw, jw->pretty); |
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} |
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int jw_is_terminated(const struct json_writer *jw) |
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{ |
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return !jw->open_stack.len; |
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} |
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void jw_end(struct json_writer *jw) |
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{ |
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char ch_open; |
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int len; |
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if (!jw->open_stack.len) |
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BUG("json-writer: too many jw_end(): '%s'", jw->json.buf); |
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len = jw->open_stack.len - 1; |
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ch_open = jw->open_stack.buf[len]; |
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strbuf_setlen(&jw->open_stack, len); |
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jw->need_comma = 1; |
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if (jw->pretty) { |
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strbuf_addch(&jw->json, '\n'); |
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indent_pretty(jw); |
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} |
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if (ch_open == '{') |
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strbuf_addch(&jw->json, '}'); |
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else |
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strbuf_addch(&jw->json, ']'); |
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}
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