157 lines
3.2 KiB
C
157 lines
3.2 KiB
C
/*
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* json.c - basic JSON parsing and printing
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* Copyright (C) 2014 Vivien Didelot
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <ctype.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "bar.h"
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#include "block.h"
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static inline bool
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is_number(const char *str)
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{
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char *end;
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strtoul(str, &end, 10);
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/* not a valid number if end is not a null character */
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return !(*str == 0 || *end != 0);
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}
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static inline void
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escape(const char *str)
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{
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fprintf(stdout, "\"");
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while (*str) {
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switch (*str) {
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case '"':
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case '\\':
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fprintf(stdout, "\\%c", *str);
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break;
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default:
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fprintf(stdout, "%c", *str);
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}
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str++;
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}
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fprintf(stdout, "\"");
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}
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static void
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print_prop(const char *key, const char *value, int flags)
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{
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/* Only print i3bar-specific properties */
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if (!(flags & PROP_I3BAR))
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return;
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if (!*value)
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return;
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fprintf(stdout, ",\"%s\":", key);
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/* Print as-is (except strings which must be escaped) */
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if (flags & PROP_STRING && flags & PROP_NUMBER && is_number(value))
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fprintf(stdout, "%s", value);
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else if (flags & PROP_STRING)
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escape(value);
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else
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fprintf(stdout, "%s", value);
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}
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static void
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print_block(struct block *block)
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{
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#define PRINT(_name, _size, _flags) \
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print_prop(#_name, block->updated_props._name, _flags); \
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fprintf(stdout, ",{\"\":\"\"");
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PROPERTIES(PRINT);
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fprintf(stdout, "}");
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#undef PRINT
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}
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/*
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* Parse the <json> input for the key <name> and store the start of its value
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* into <start> and its size into <len>.
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*
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* <start> set to 0 means that the key was not present.
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*/
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void
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json_parse(const char *json, const char *name, int *start, int *len)
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{
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const size_t keylen = strlen(name) + 2;
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char key[keylen + 1];
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snprintf(key, sizeof(key), "\"%s\"", name);
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*start = *len = 0;
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char *here = strstr(json, key);
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if (here) {
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here += keylen + 1;
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/* skip pre-value whitespace */
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while (isspace(*here))
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here++;
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if (*here == '"') {
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/* string */
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here++;
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*start = here - json;
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while (*here && *here != '"')
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*len += 1, here++;
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/* invalidate on incomplete string */
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if (*here != '"')
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*start = 0;
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} else {
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/* number */
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*start = here - json;
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while (isdigit(*here++))
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*len += 1;
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}
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}
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}
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void
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json_print_bar(struct bar *bar)
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{
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fprintf(stdout, ",[{\"full_text\":\"\"}");
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for (int i = 0; i < bar->num; ++i) {
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struct block *block = bar->blocks + i;
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/* full_text is the only mandatory key, skip if empty */
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if (!*FULL_TEXT(block)) {
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bdebug(block, "no text to display, skipping");
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continue;
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}
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print_block(block);
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}
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fprintf(stdout, "]\n");
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fflush(stdout);
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}
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