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https://github.com/servalproject/serval-dna.git
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ce788eaeec
This allows the same function to be used with different commands.
Recent improvements to the parser stopped adding labels for bare words
"word" in the CLI schema, to reduce the chance of label conflicts, eg {
"get", "file", "<file>" }. Now a backslash-prepended word in the schema
"\word" will cause the matched argument to be labelled "word", just like
"[word]" does except "\word" is not optional.
279 lines
8.6 KiB
C
279 lines
8.6 KiB
C
#include <stdio.h>
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#include <strings.h>
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#include "cli.h"
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#include "log.h"
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#include "serval.h"
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#include "rhizome.h"
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int cli_usage(const struct cli_schema *commands) {
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printf("Usage:\n");
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unsigned cmd;
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for (cmd = 0; commands[cmd].function; ++cmd) {
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unsigned opt;
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const char *word;
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for (opt = 0; (word = commands[cmd].words[opt]); ++opt) {
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if (word[0] == '\\')
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++word;
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printf(" %s", word);
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}
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printf("\n %s\n",commands[cmd].description);
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}
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return 0;
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}
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int cli_parse(const int argc, const char *const *args, const struct cli_schema *commands, struct cli_parsed *parsed)
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{
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int ambiguous = 0;
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int matched_cmd = -1;
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int cmd;
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for (cmd = 0; commands[cmd].function; ++cmd) {
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struct cli_parsed cmdpa;
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memset(&cmdpa, 0, sizeof cmdpa);
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cmdpa.command = &commands[cmd];
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cmdpa.args = args;
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cmdpa.argc = argc;
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cmdpa.labelc = 0;
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cmdpa.varargi = -1;
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const char *word = NULL;
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unsigned arg = 0;
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unsigned opt = 0;
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while ((word = commands[cmd].words[opt])) {
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//DEBUGF("cmd=%d opt=%d word='%s' args[arg=%d]='%s'", cmd, opt, word, arg, arg < argc ? args[arg] : "");
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unsigned wordlen = strlen(word);
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if (cmdpa.varargi != -1)
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return WHYF("Internal error: commands[%d].word[%d]=\"%s\" - more words not allowed after \"...\"", cmd, opt, word);
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/* These are the argument matching rules:
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*
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* "..." consumes all remaining arguments
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*
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* "word" consumes one argument that exactly matches "word", does not label it
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*
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* "\word" consumes one argument that exactly matches "word" and labels it "word"
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*
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* "[word]" consumes one argument if it exactly matches "word", records it with label
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* "word"
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*
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* "<label>" consumes exactly one argument "ANY", records it with label "label"
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*
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* "prefix=<any>" consumes one argument "prefix=ANY" or two arguments "prefix" "ANY",
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* and records the text matching ANY with label "prefix"
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*
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* "prefix <any>" consumes one argyment "prefix ANY" if available or two arguments "prefix"
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* "ANY", and records the text matching ANY with label "prefix"
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*
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* "prefix<any>" consumes one argument "prefixANY", and records the text matching ANY with
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* label "prefix"
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*
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* "[<label>]" consumes one argument "ANY" if available, records it with label "label"
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*
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* "[prefix=<any>]" consumes one argument "prefix=ANY" if available or two arguments
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* "prefix" "ANY" if available, records the text matching ANY with label "prefix"
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*
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* "[prefix <any>]" consumes one argument "prefix ANY" if available or two arguments
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* "prefix" "ANY" if available, records the text matching ANY with label "prefix"
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*
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* "[prefix<any>]" consumes one argument "prefixANY" if available, records the text matching
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* ANY with label "prefix"
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*/
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if (wordlen == 3 && word[0] == '.' && word[1] == '.' && word[2] == '.') {
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cmdpa.varargi = arg;
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arg = argc;
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++opt;
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} else {
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int optional = 0;
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int repeating = 0;
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if (wordlen > 5 && word[0] == '[' && word[wordlen-4] == ']' && word[wordlen-3] == '.' && word[wordlen-2] == '.' && word[wordlen-1] == '.') {
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optional = repeating = 1;
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word += 1;
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wordlen -= 5;
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}
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else if (wordlen > 2 && word[0] == '[' && word[wordlen-1] == ']') {
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optional = 1;
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word += 1;
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wordlen -= 2;
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}
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const char *prefix = NULL;
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unsigned prefixlen = 0;
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char prefixarglen = 0;
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const char *label = NULL;
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unsigned labellen = 0;
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const char *text = NULL;
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const char *caret = strchr(word, '<');
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unsigned oarg = arg;
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if (wordlen > 2 && caret && word[wordlen-1] == '>') {
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if ((prefixarglen = prefixlen = caret - word)) {
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prefix = word;
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if (prefixlen > 1 && (prefix[prefixlen-1] == '=' || prefix[prefixlen-1] == ' '))
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--prefixarglen;
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label = prefix;
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labellen = prefixarglen;
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if (arg < argc) {
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unsigned arglen = strlen(args[arg]);
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if (arglen >= prefixlen && strncmp(args[arg], prefix, prefixlen) == 0) {
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text = args[arg++] + prefixlen;
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} else if (arg + 1 < argc && arglen == prefixarglen && strncmp(args[arg], prefix, prefixarglen) == 0) {
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++arg;
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text = args[arg++];
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}
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}
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} else {
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label = &word[1];
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labellen = wordlen - 2;
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if (arg < argc)
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text = args[arg++];
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}
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} else if (wordlen > 1 && word[0] == '\\') {
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if (strlen(args[arg]) == wordlen - 1 && strncmp(args[arg], &word[1], wordlen - 1) == 0) {
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label = &word[1];
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labellen = wordlen - 1;
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text = args[arg++];
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}
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} else if (arg < argc && strlen(args[arg]) == wordlen && strncmp(args[arg], word, wordlen) == 0) {
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if (optional) {
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text = args[arg];
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label = word;
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labellen = wordlen;
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}
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++arg;
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}
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if (arg == oarg && !optional)
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break;
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if (labellen && text) {
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if (cmdpa.labelc >= NELS(cmdpa.labelv))
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return WHYF("Internal error: commands[%d].word[%d]=\"%s\" - label limit exceeded", cmd, opt, word);
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cmdpa.labelv[cmdpa.labelc].label = label;
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cmdpa.labelv[cmdpa.labelc].len = labellen;
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cmdpa.labelv[cmdpa.labelc].text = text;
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++cmdpa.labelc;
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if (!repeating)
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++opt;
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} else
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++opt;
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}
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}
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//DEBUGF("cmd=%d opt=%d args[arg=%d]='%s'", cmd, opt, arg, arg < argc ? args[arg] : "");
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if (!word && arg == argc) {
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/* A match! We got through the command definition with no internal errors and all literal
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args matched and we have a proper number of args. If we have multiple matches, then note
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that the call is ambiguous. */
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if (matched_cmd >= 0)
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++ambiguous;
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if (ambiguous == 1) {
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WHY("Ambiguous command line call:");
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WHY_argv(" ", argc, args);
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WHY("Matches the following known command line calls:");
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WHY_argv(" ", argc, commands[matched_cmd].words);
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}
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if (ambiguous)
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WHY_argv(" ", argc, commands[cmd].words);
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matched_cmd = cmd;
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*parsed = cmdpa;
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}
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}
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/* Don't process ambiguous calls */
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if (ambiguous)
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return -1;
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/* Complain if we found no matching calls */
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if (matched_cmd < 0) {
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if (argc) {
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WHY("Unknown command line call:");
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WHY_argv(" ", argc, args);
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}
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INFO("Use \"help\" command to see a list of valid commands");
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return -1;
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}
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return matched_cmd;
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}
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void _debug_cli_parsed(struct __sourceloc __whence, const struct cli_parsed *parsed)
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{
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DEBUG_argv("command", parsed->argc, parsed->args);
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strbuf b = strbuf_alloca(1024);
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int i;
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for (i = 0; i < parsed->labelc; ++i) {
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const struct labelv *lab = &parsed->labelv[i];
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strbuf_sprintf(b, " %s=%s", alloca_toprint(-1, lab->label, lab->len), alloca_str_toprint(lab->text));
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}
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if (parsed->varargi >= 0)
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strbuf_sprintf(b, " varargi=%d", parsed->varargi);
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DEBUGF("parsed%s", strbuf_str(b));
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}
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int cli_invoke(const struct cli_parsed *parsed, void *context)
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{
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IN();
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int ret = parsed->command->function(parsed, context);
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RETURN(ret);
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}
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int _cli_arg(struct __sourceloc __whence, const struct cli_parsed *parsed, char *label, const char **dst, int (*validator)(const char *arg), char *defaultvalue)
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{
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int labellen = strlen(label);
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if (dst)
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*dst = defaultvalue;
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int i;
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for (i = 0; i < parsed->labelc; ++i) {
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if (parsed->labelv[i].len == labellen && strncasecmp(label, parsed->labelv[i].label, labellen) == 0) {
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const char *value = parsed->labelv[i].text;
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if (validator && !(*validator)(value))
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return WHYF("Invalid '%s' argument \"%s\"", label, value);
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if (dst)
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*dst = value;
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return 0;
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}
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}
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/* No matching valid argument was found, so return default value. It might seem that this should
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never happen, but it can because more than one version of a command line option may exist, one
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with a given argument and another without, and allowing a default value means we can have a
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single function handle both in a fairly simple manner. */
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return 1;
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}
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int cli_lookup_did(const char *text)
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{
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return text[0] == '\0' || strcmp(text, "*") == 0 || str_is_did(text);
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}
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int cli_absolute_path(const char *arg)
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{
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return arg[0] == '/' && arg[1] != '\0';
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}
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int cli_optional_sid(const char *arg)
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{
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return !arg[0] || str_is_subscriber_id(arg);
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}
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int cli_optional_bundle_key(const char *arg)
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{
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return !arg[0] || rhizome_str_is_bundle_key(arg);
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}
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int cli_manifestid(const char *arg)
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{
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return rhizome_str_is_manifest_id(arg);
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}
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int cli_fileid(const char *arg)
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{
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return rhizome_str_is_file_hash(arg);
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}
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int cli_optional_bundle_crypt_key(const char *arg)
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{
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return !arg[0] || rhizome_str_is_bundle_crypt_key(arg);
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}
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int cli_uint(const char *arg)
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{
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register const char *s = arg;
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while (isdigit(*s))
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++s;
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return s != arg && *s == '\0';
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}
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int cli_optional_did(const char *text)
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{
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return text[0] == '\0' || str_is_did(text);
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}
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