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#include <assert.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/stat.h>
#include <libgen.h>
#include "jq_parser.h"
#include "locfile.h"
#include "jv.h"
#include "jq.h"
#include "parser.h"
#include "util.h"
#include "compile.h"
struct lib_loading_state {
char **names;
block *defs;
uint64_t ct;
};
static int load_library(jq_state *jq, jv lib_path, block *out_block, struct lib_loading_state *lib_state);
// Given a lib_path to search first, creates a chain of search paths
// in the following order:
// 1. lib_path
// 2. -L paths passed in on the command line (from jq_state*)
// 3. JQ_LIBRARY_PATH environment variable
jv build_lib_search_chain(jq_state *jq, jv lib_path) {
assert(jv_get_kind(lib_path) == JV_KIND_STRING);
jv out_paths = jv_array();
if (jv_string_length_bytes(jv_copy(lib_path)))
out_paths = jv_array_append(out_paths, lib_path);
else
jv_free(lib_path);
jv lib_dirs = jq_get_lib_dirs(jq);
jv_array_foreach(lib_dirs, i, path) {
if (jv_string_length_bytes(jv_copy(path)) == 0) {
jv_free(path);
continue;
}
path = expand_path(path);
if (jv_is_valid(path)) {
out_paths = jv_array_append(out_paths, path);
} else {
jv emsg = jv_invalid_get_msg(path);
fprintf(stderr, "jq: warning: skipping search path: %s\n", jv_string_value(emsg));
jv_free(emsg);
}
}
jv_free(lib_dirs);
return out_paths;
}
static jv find_lib(jq_state *jq, jv lib_name, jv lib_search_path) {
assert(jv_get_kind(lib_search_path) == JV_KIND_STRING);
assert(jv_get_kind(lib_name) == JV_KIND_STRING);
lib_search_path = expand_path(lib_search_path);
struct stat st;
int ret;
jv lib_search_paths = build_lib_search_chain(jq, lib_search_path);
jv_array_foreach(lib_search_paths, i, spath) {
jv testpath = jq_realpath(jv_string_fmt("%s/%s.jq",jv_string_value(spath),jv_string_value(lib_name)));
jv_free(spath);
ret = stat(jv_string_value(testpath),&st);
if (ret == 0) {
jv_free(lib_name);
jv_free(lib_search_paths);
return testpath;
}
jv_free(testpath);
}
jv output = jv_invalid_with_msg(jv_string_fmt("could not find library: %s", jv_string_value(lib_name)));
jv_free(lib_name);
jv_free(lib_search_paths);
return output;
}
static int process_dependencies(jq_state *jq, jv lib_origin, block *src_block, struct lib_loading_state *lib_state) {
jv deps = block_take_imports(src_block);
block bk = *src_block;
int nerrors = 0;
jv_array_foreach(deps, i, dep) {
jv name = jv_object_get(jv_copy(dep), jv_string("name"));
jv as = jv_object_get(jv_copy(dep), jv_string("as"));
if (!jv_is_valid(as)) {
jv_free(as);
as = jv_copy(name);
}
jv search = jv_object_get(dep, jv_string("search"));
if (!jv_is_valid(search)) {
jv_free(search);
search = jv_string("");
}
if (strncmp("$ORIGIN/",jv_string_value(search),8) == 0) {
jv tsearch = jv_string_fmt("%s/%s",jv_string_value(lib_origin),jv_string_value(search)+8);
jv_free(search);
search = tsearch;
}
jv lib_path = find_lib(jq, name, search);
if (!jv_is_valid(lib_path)) {
jv emsg = jv_invalid_get_msg(lib_path);
fprintf(stderr, "jq: error: %s\n",jv_string_value(emsg));
jv_free(emsg);
jv_free(lib_origin);
jv_free(as);
jv_free(deps);
return 1;
}
uint64_t state_idx = 0;
for (; state_idx < lib_state->ct; ++state_idx) {
if (strcmp(lib_state->names[state_idx],jv_string_value(lib_path)) == 0)
break;
}
if (state_idx < lib_state->ct) { // Found
bk = block_bind_library(lib_state->defs[state_idx], bk, OP_IS_CALL_PSEUDO, jv_string_value(as));
jv_free(lib_path);
} else { // Not found. Add it to the table before binding.
block dep_def_block = gen_noop();
nerrors += load_library(jq, lib_path, &dep_def_block, lib_state);
if (nerrors == 0)
bk = block_bind_library(dep_def_block, bk, OP_IS_CALL_PSEUDO, jv_string_value(as));
}
jv_free(as);
}
jv_free(lib_origin);
jv_free(deps);
return nerrors;
}
// Loads the library at lib_path into lib_state, putting the library's defs
// into *out_block
static int load_library(jq_state *jq, jv lib_path, block *out_block, struct lib_loading_state *lib_state) {
int nerrors = 0;
struct locfile* src;
block program;
jv data = jv_load_file(jv_string_value(lib_path), 1);
int state_idx;
if (jv_is_valid(data)) {
src = locfile_init(jq, jv_string_value(data), jv_string_length_bytes(jv_copy(data)));
nerrors += jq_parse_library(src, &program);
if (nerrors == 0) {
state_idx = lib_state->ct++;
lib_state->names = realloc(lib_state->names, lib_state->ct * sizeof(const char *));
lib_state->defs = realloc(lib_state->defs, lib_state->ct * sizeof(block));
lib_state->names[state_idx] = strdup(jv_string_value(lib_path));
lib_state->defs[state_idx] = program;
char *lib_origin = strdup(jv_string_value(lib_path));
nerrors += process_dependencies(jq, jv_string(dirname(lib_origin)), &lib_state->defs[state_idx], lib_state);
free(lib_origin);
*out_block = lib_state->defs[state_idx];
}
locfile_free(src);
}
jv_free(lib_path);
jv_free(data);
return nerrors;
}
int load_program(jq_state *jq, struct locfile* src, block *out_block) {
int nerrors = 0;
block program;
struct lib_loading_state lib_state = {0,0,0};
nerrors = jq_parse(src, &program);
if (nerrors)
return nerrors;
nerrors = process_dependencies(jq, jq_get_lib_origin(jq), &program, &lib_state);
block libs = gen_noop();
for (uint64_t i = 0; i < lib_state.ct; ++i) {
free(lib_state.names[i]);
if (nerrors == 0)
libs = block_join(libs, lib_state.defs[i]);
else
block_free(lib_state.defs[i]);
}
free(lib_state.names);
free(lib_state.defs);
if (nerrors)
block_free(program);
else
*out_block = block_drop_unreferenced(block_join(libs, program));
return nerrors;
}
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