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jq/main.c
T
Nicolas Williams 56ae88d9d5 Module search revamp for pkg managers 
The search path listed in an import directive can now be an array.  The
top-level search path is appended.  Null and empty strings in the path
terminate any search.  The "." in "." and "./*" is replaced with the
directory containing the file doing the import (for command-line
programs this is the current directory, though that may be a bad idea).

No version numbers or anything of the sort are gratuitously added to the
search paths.

All this makes external package managers possible by allowing
dependencies to be installed local to dependents.
2014-12-24 02:31:51 -06:00

567 lines
18 KiB
C
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#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <libgen.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "compile.h"
#include "jv.h"
#include "jq.h"
#include "jv_alloc.h"
#include "util.h"
#include "version.h"
int jq_testsuite(int argc, char* argv[]);
static const char* progname;
/*
* For a longer help message we could use a better option parsing
* strategy, one that lets stack options.
*/
static void usage(int code) {
fprintf(stderr, "\njq - commandline JSON processor [version %s]\n", JQ_VERSION);
fprintf(stderr, "Usage: %s [options] <jq filter> [file...]\n\n", progname);
fprintf(stderr, "\tjq is a tool for processing JSON inputs, applying the\n");
fprintf(stderr, "\tgiven filter to its JSON text inputs and producing the\n");
fprintf(stderr, "\tfilter's results as JSON on standard output.\n");
fprintf(stderr, "\tThe simplest filter is ., which is the identity filter,\n");
fprintf(stderr, "\tcopying jq's input to its output.\n");
fprintf(stderr, "\tFor more advanced filters see the jq(1) manpage (\"man jq\")\n");
fprintf(stderr, "\tand/or http://stedolan.github.com/jq\n\n");
fprintf(stderr, "\tSome of the options include:\n");
fprintf(stderr, "\t -h\t\tthis message;\n");
fprintf(stderr, "\t -c\t\tcompact instead of pretty-printed output;\n");
fprintf(stderr, "\t -n\t\tuse `null` as the single input value;\n");
fprintf(stderr, "\t -i\t\tedit the [first] file in-place;\n");
fprintf(stderr, "\t -s\t\tread (slurp) all inputs into an array; apply filter to it;\n");
fprintf(stderr, "\t -r\t\toutput raw strings, not JSON texts;\n");
fprintf(stderr, "\t -R\t\tread raw strings, not JSON texts;\n");
fprintf(stderr, "\t --arg a v\tset variable $a to value <v>;\n");
fprintf(stderr, "\t --argjson a v\tset variable $a to JSON value <v>;\n");
fprintf(stderr, "\t --argfile a f\tset variable $a to JSON texts read from <f>;\n");
fprintf(stderr, "\tSee the manpage for more options.\n");
exit(code);
}
static void die() {
fprintf(stderr, "Use %s --help for help with command-line options,\n", progname);
fprintf(stderr, "or see the jq manpage, or online docs at http://stedolan.github.com/jq\n");
exit(2);
}
static int isoptish(const char* text) {
return text[0] == '-' && (text[1] == '-' || isalpha(text[1]));
}
static int isoption(const char* text, char shortopt, const char* longopt, size_t *short_opts) {
if (text[0] != '-' || text[1] == '-')
*short_opts = 0;
if (text[0] != '-') return 0;
// check long option
if (text[1] == '-' && !strcmp(text+2, longopt)) return 1;
else if (text[1] == '-') return 0;
// must be short option; check it and...
if (!shortopt) return 0;
if (strchr(text, shortopt) != NULL) {
(*short_opts)++; // ...count it (for option stacking)
return 1;
}
return 0;
}
enum {
SLURP = 1,
RAW_INPUT = 2,
PROVIDE_NULL = 4,
RAW_OUTPUT = 8,
COMPACT_OUTPUT = 16,
ASCII_OUTPUT = 32,
COLOUR_OUTPUT = 64,
NO_COLOUR_OUTPUT = 128,
SORTED_OUTPUT = 256,
FROM_FILE = 512,
RAW_NO_LF = 1024,
UNBUFFERED_OUTPUT = 2048,
EXIT_STATUS = 4096,
IN_PLACE = 8192,
SEQ = 16384,
/* debugging only */
DUMP_DISASM = 32768,
};
static int options = 0;
static int process(jq_state *jq, jv value, int flags) {
int ret = 14; // No valid results && -e -> exit(4)
jq_start(jq, value, flags);
jv result;
while (jv_is_valid(result = jq_next(jq))) {
if ((options & RAW_OUTPUT) && jv_get_kind(result) == JV_KIND_STRING) {
fwrite(jv_string_value(result), 1, jv_string_length_bytes(jv_copy(result)), stdout);
ret = 0;
jv_free(result);
} else {
int dumpopts;
/* Disable colour by default on Windows builds as Windows
terminals tend not to display it correctly */
#ifdef WIN32
dumpopts = 0;
#else
dumpopts = isatty(fileno(stdout)) ? JV_PRINT_COLOUR : 0;
#endif
if (options & SORTED_OUTPUT) dumpopts |= JV_PRINT_SORTED;
if (!(options & COMPACT_OUTPUT)) dumpopts |= JV_PRINT_PRETTY;
if (options & ASCII_OUTPUT) dumpopts |= JV_PRINT_ASCII;
if (options & COLOUR_OUTPUT) dumpopts |= JV_PRINT_COLOUR;
if (options & NO_COLOUR_OUTPUT) dumpopts &= ~JV_PRINT_COLOUR;
if (jv_get_kind(result) == JV_KIND_FALSE || jv_get_kind(result) == JV_KIND_NULL)
ret = 11;
else
ret = 0;
if (options & SEQ)
fwrite("\036", 1, 1, stdout);
jv_dump(result, dumpopts);
}
if (!(options & RAW_NO_LF))
printf("\n");
if (options & UNBUFFERED_OUTPUT)
fflush(stdout);
}
if (jv_invalid_has_msg(jv_copy(result))) {
// Uncaught jq exception
jv msg = jv_invalid_get_msg(jv_copy(result));
if (jv_get_kind(msg) == JV_KIND_STRING) {
fprintf(stderr, "jq: error: %s\n", jv_string_value(msg));
} else {
msg = jv_dump_string(msg, 0);
fprintf(stderr, "jq: error (not a string): %s\n", jv_string_value(msg));
}
jv_free(msg);
}
jv_free(result);
return ret;
}
FILE* current_input;
const char** input_filenames = NULL;
int ninput_files;
int next_input_idx;
static int read_more(char* buf, size_t size, int* islast) {
while (!current_input || feof(current_input)) {
if (current_input) {
if (current_input == stdin) {
clearerr(stdin); // perhaps we can read again
} else {
fclose(current_input);
}
current_input = 0;
}
if (next_input_idx == ninput_files) {
assert(*islast == 1);
return 0;
}
*islast = 0;
if (!strcmp(input_filenames[next_input_idx], "-")) {
current_input = stdin;
} else {
current_input = fopen(input_filenames[next_input_idx], "r");
}
if (!current_input) {
fprintf(stderr, "%s: %s: %s\n", progname, input_filenames[next_input_idx], strerror(errno));
}
next_input_idx++;
*islast = (next_input_idx == ninput_files);
}
if (!fgets(buf, size, current_input)) buf[0] = 0;
if (!current_input || feof(current_input)) *islast = 1;
return 1;
}
int main(int argc, char* argv[]) {
jq_state *jq = NULL;
int ret = 0;
int compiled = 0;
char *t = NULL;
if (argc) progname = argv[0];
if (argc > 1 && !strcmp(argv[1], "--run-tests")) {
return jq_testsuite(argc, argv);
}
jq = jq_init();
if (jq == NULL) {
perror("malloc");
ret = 2;
goto out;
}
const char* program = 0;
input_filenames = jv_mem_alloc(sizeof(const char*) * argc);
ninput_files = 0;
int further_args_are_files = 0;
int jq_flags = 0;
size_t short_opts = 0;
jv program_arguments = jv_array();
jv lib_search_paths = jv_null();
for (int i=1; i<argc; i++, short_opts = 0) {
if (further_args_are_files) {
input_filenames[ninput_files++] = argv[i];
} else if (!strcmp(argv[i], "--")) {
if (!program) usage(2);
further_args_are_files = 1;
} else if (!isoptish(argv[i])) {
if (program) {
input_filenames[ninput_files++] = argv[i];
} else {
program = argv[i];
}
} else {
if (argv[i][1] == 'L') {
if (jv_get_kind(lib_search_paths) == JV_KIND_NULL)
lib_search_paths = jv_array();
if (argv[i][2] != 0) { // -Lname (faster check than strlen)
lib_search_paths = jv_array_append(lib_search_paths, jv_string(argv[i]+2));
} else if (i >= argc - 1) {
fprintf(stderr, "-L takes a parameter: (e.g. -L /search/path or -L/search/path)\n");
die();
} else {
lib_search_paths = jv_array_append(lib_search_paths, jv_string(argv[i+1]));
i++;
}
continue;
}
if (isoption(argv[i], 's', "slurp", &short_opts)) {
options |= SLURP;
if (!short_opts) continue;
}
if (isoption(argv[i], 'r', "raw-output", &short_opts)) {
options |= RAW_OUTPUT;
if (!short_opts) continue;
}
if (isoption(argv[i], 'c', "compact-output", &short_opts)) {
options |= COMPACT_OUTPUT;
if (!short_opts) continue;
}
if (isoption(argv[i], 'C', "color-output", &short_opts)) {
options |= COLOUR_OUTPUT;
if (!short_opts) continue;
}
if (isoption(argv[i], 'M', "monochrome-output", &short_opts)) {
options |= NO_COLOUR_OUTPUT;
if (!short_opts) continue;
}
if (isoption(argv[i], 'a', "ascii-output", &short_opts)) {
options |= ASCII_OUTPUT;
if (!short_opts) continue;
}
if (isoption(argv[i], 0, "unbuffered", &short_opts)) {
options |= UNBUFFERED_OUTPUT;
if (!short_opts) continue;
}
if (isoption(argv[i], 'S', "sort-keys", &short_opts)) {
options |= SORTED_OUTPUT;
if (!short_opts) continue;
}
if (isoption(argv[i], 'R', "raw-input", &short_opts)) {
options |= RAW_INPUT;
if (!short_opts) continue;
}
if (isoption(argv[i], 'n', "null-input", &short_opts)) {
options |= PROVIDE_NULL;
if (!short_opts) continue;
}
if (isoption(argv[i], 'f', "from-file", &short_opts)) {
options |= FROM_FILE;
if (!short_opts) continue;
}
if (isoption(argv[i], 'j', "join-output", &short_opts)) {
options |= RAW_OUTPUT | RAW_NO_LF;
if (!short_opts) continue;
}
if (isoption(argv[i], 'i', "in-place", &short_opts)) {
options |= IN_PLACE;
if (!short_opts) continue;
}
if (isoption(argv[i], 0, "seq", &short_opts)) {
options |= SEQ;
if (!short_opts) continue;
}
if (isoption(argv[i], 'e', "exit-status", &short_opts)) {
options |= EXIT_STATUS;
if (!short_opts) continue;
}
if (isoption(argv[i], 0, "arg", &short_opts)) {
if (i >= argc - 2) {
fprintf(stderr, "%s: --arg takes two parameters (e.g. -a varname value)\n", progname);
die();
}
jv arg = jv_object();
arg = jv_object_set(arg, jv_string("name"), jv_string(argv[i+1]));
arg = jv_object_set(arg, jv_string("value"), jv_string(argv[i+2]));
program_arguments = jv_array_append(program_arguments, arg);
i += 2; // skip the next two arguments
if (!short_opts) continue;
}
if (isoption(argv[i], 0, "argjson", &short_opts)) {
if (i >= argc - 2) {
fprintf(stderr, "%s: --argjson takes two parameters (e.g. -a varname text)\n", progname);
die();
}
jv v = jv_parse(argv[i+2]);
if (!jv_is_valid(v)) {
fprintf(stderr, "%s: invalid JSON text passed to --argjson\n", progname);
die();
}
jv arg = jv_object();
arg = jv_object_set(arg, jv_string("name"), jv_string(argv[i+1]));
arg = jv_object_set(arg, jv_string("value"), v);
program_arguments = jv_array_append(program_arguments, arg);
i += 2; // skip the next two arguments
if (!short_opts) continue;
}
if (isoption(argv[i], 0, "argfile", &short_opts)) {
if (i >= argc - 2) {
fprintf(stderr, "%s: --argfile takes two parameters (e.g. -a varname filename)\n", progname);
die();
}
jv arg = jv_object();
arg = jv_object_set(arg, jv_string("name"), jv_string(argv[i+1]));
jv data = jv_load_file(argv[i+2], 0);
if (!jv_is_valid(data)) {
data = jv_invalid_get_msg(data);
fprintf(stderr, "%s: Bad JSON in --argfile %s %s: %s\n", progname,
argv[i+1], argv[i+2], jv_string_value(data));
jv_free(data);
ret = 2;
goto out;
}
if (jv_get_kind(data) == JV_KIND_ARRAY && jv_array_length(jv_copy(data)) == 1)
data = jv_array_get(data, 0);
arg = jv_object_set(arg, jv_string("value"), data);
program_arguments = jv_array_append(program_arguments, arg);
i += 2; // skip the next two arguments
if (!short_opts) continue;
}
if (isoption(argv[i], 0, "debug-dump-disasm", &short_opts)) {
options |= DUMP_DISASM;
if (!short_opts) continue;
}
if (isoption(argv[i], 0, "debug-trace", &short_opts)) {
jq_flags |= JQ_DEBUG_TRACE;
if (!short_opts) continue;
}
if (isoption(argv[i], 'h', "help", &short_opts)) {
usage(0);
if (!short_opts) continue;
}
if (isoption(argv[i], 'V', "version", &short_opts)) {
printf("jq-%s\n", JQ_VERSION);
ret = 0;
goto out;
}
// check for unknown options... if this argument was a short option
if (strlen(argv[i]) != short_opts + 1) {
fprintf(stderr, "%s: Unknown option %s\n", progname, argv[i]);
die();
}
}
}
char *penv = getenv("JQ_LIBRARY_PATH");
if (penv && jv_get_kind(lib_search_paths) == JV_KIND_NULL) {
// Use $JQ_LIBRARY_PATH
#ifdef WIN32
#define PATH_ENV_SEPARATOR ";"
#else
#define PATH_ENV_SEPARATOR ":"
#endif
lib_search_paths = jv_array_concat(lib_search_paths,jv_string_split(jv_string(penv),jv_string(PATH_ENV_SEPARATOR)));
#undef PATH_ENV_SEPARATOR
} else if (jv_get_kind(lib_search_paths) == JV_KIND_NULL) {
// Use compiled-in default JQ_LIBRARY_PATH
#ifdef WIN32
lib_search_paths = JV_ARRAY(jv_string("~/.jq"), jv_string("$ORIGIN/lib"));
#else
lib_search_paths = JV_ARRAY(jv_string("~/.jq"), jv_string("$ORIGIN/../lib/jq"));
#endif
}
jq_set_attr(jq, jv_string("JQ_LIBRARY_PATH"), lib_search_paths);
char *origin = strdup(argv[0]);
if (origin == NULL) {
fprintf(stderr, "Error: out of memory\n");
exit(1);
}
jq_set_attr(jq, jv_string("JQ_ORIGIN"), jv_string(dirname(origin)));
free(origin);
if (strchr(JQ_VERSION, '-') == NULL)
jq_set_attr(jq, jv_string("VERSION_DIR"), jv_string(JQ_VERSION));
else
jq_set_attr(jq, jv_string("VERSION_DIR"), jv_string_fmt("%.*s-master", (int)(strchr(JQ_VERSION, '-') - JQ_VERSION), JQ_VERSION));
#if (!defined(WIN32) && defined(HAVE_ISATTY)) || defined(HAVE__ISATTY)
#if defined(HAVE__ISATTY) && defined(isatty)
#undef isatty
#define isatty _isatty
#endif
if (!program && isatty(STDOUT_FILENO) && !isatty(STDIN_FILENO))
program = ".";
#endif
if (!program) usage(2);
if ((options & IN_PLACE)) {
if (ninput_files == 0) usage(2);
if (strcmp(input_filenames[0], "-") == 0) usage(2);
size_t tlen = strlen(input_filenames[0]) + 7;
t = jv_mem_alloc(tlen);
int n = snprintf(t, tlen,"%sXXXXXX", input_filenames[0]);
assert(n > 0 && (size_t)n < tlen);
if (mkstemp(t) == -1) {
fprintf(stderr, "Error: %s creating temporary file", strerror(errno));
exit(3);
}
if (freopen(t, "w", stdout) == NULL) {
fprintf(stderr, "Error: %s redirecting stdout to temporary file", strerror(errno));
exit(3);
}
}
if (ninput_files == 0) current_input = stdin;
if ((options & PROVIDE_NULL) && (options & (RAW_INPUT | SLURP))) {
fprintf(stderr, "%s: --null-input cannot be used with --raw-input or --slurp\n", progname);
die();
}
if (options & FROM_FILE) {
char *program_origin = strdup(program);
if (program_origin == NULL) {
perror("malloc");
exit(2);
}
jv data = jv_load_file(program, 1);
if (!jv_is_valid(data)) {
data = jv_invalid_get_msg(data);
fprintf(stderr, "%s: %s\n", progname, jv_string_value(data));
jv_free(data);
ret = 2;
goto out;
}
jq_set_attr(jq, jv_string("PROGRAM_ORIGIN"), jq_realpath(jv_string(dirname(program_origin))));
compiled = jq_compile_args(jq, jv_string_value(data), program_arguments);
free(program_origin);
jv_free(data);
} else {
jq_set_attr(jq, jv_string("PROGRAM_ORIGIN"), jq_realpath(jv_string("."))); // XXX is this good?
compiled = jq_compile_args(jq, program, program_arguments);
}
if (!compiled){
ret = 3;
goto out;
}
if (options & DUMP_DISASM) {
jq_dump_disassembly(jq, 0);
printf("\n");
}
if (options & PROVIDE_NULL) {
ret = process(jq, jv_null(), jq_flags);
} else {
jv slurped;
if (options & SLURP) {
if (options & RAW_INPUT) {
slurped = jv_string("");
} else {
slurped = jv_array();
}
}
struct jv_parser* parser = jv_parser_new((options & SEQ) ? JV_PARSE_SEQ : 0);
char buf[4096];
int is_last = 0;
while (read_more(buf, sizeof(buf), &is_last)) {
if (options & RAW_INPUT) {
int len = strlen(buf);
if (len > 0) {
if (options & SLURP) {
slurped = jv_string_concat(slurped, jv_string(buf));
} else {
if (buf[len-1] == '\n') buf[len-1] = 0;
ret = process(jq, jv_string(buf), jq_flags);
}
}
} else {
jv_parser_set_buf(parser, buf, strlen(buf), !is_last);
jv value;
while (jv_is_valid(value = jv_parser_next(parser)) || jv_invalid_has_msg(jv_copy(value))) {
if (!jv_is_valid(value)) {
jv msg = jv_invalid_get_msg(value);
if (!(options & SEQ)) {
// We used to treat parse errors as fatal...
ret = 4;
fprintf(stderr, "parse error: %s\n", jv_string_value(msg));
jv_free(msg);
break;
}
fprintf(stderr, "ignoring parse error: %s\n", jv_string_value(msg));
jv_free(msg);
// ...but with --seq we attempt to recover.
continue;
}
if (options & SLURP) {
slurped = jv_array_append(slurped, value);
} else {
ret = process(jq, value, jq_flags);
value = jv_invalid();
}
}
}
}
jv_parser_free(parser);
if (ret != 0)
goto out;
if (options & SLURP) {
ret = process(jq, slurped, jq_flags);
}
}
if ((options & IN_PLACE)) {
FILE *devnull;
#ifdef WIN32
devnull = freopen("NUL", "w+", stdout);
#else
devnull = freopen("/dev/null", "w+", stdout);
#endif
if (devnull == NULL) {
fprintf(stderr, "Error: %s opening /dev/null\n", strerror(errno));
exit(3);
}
if (rename(t, input_filenames[0]) == -1) {
fprintf(stderr, "Error: %s renaming temporary file\n", strerror(errno));
exit(3);
}
jv_mem_free(t);
}
out:
jv_mem_free(input_filenames);
jq_teardown(&jq);
if (ret >= 10 && (options & EXIT_STATUS))
return ret - 10;
if (ret >= 10)
return 0;
return ret;
}
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