279 lines
9.8 KiB
C
279 lines
9.8 KiB
C
/***************************************************************************************************
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Zyan Core Library (Zycore-C)
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Original Author : Joel Hoener
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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***************************************************************************************************/
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#include <Zycore/ArgParse.h>
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#include <Zycore/LibC.h>
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/* ============================================================================================== */
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/* Exported functions */
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/* ============================================================================================== */
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#ifndef ZYAN_NO_LIBC
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ZyanStatus ZyanArgParse(const ZyanArgParseConfig *cfg, ZyanVector* parsed,
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const char** error_token)
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{
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return ZyanArgParseEx(cfg, parsed, error_token, ZyanAllocatorDefault());
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}
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#endif
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ZyanStatus ZyanArgParseEx(const ZyanArgParseConfig *cfg, ZyanVector* parsed,
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const char** error_token, ZyanAllocator* allocator)
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{
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# define ZYAN_ERR_TOK(tok) if (error_token) { *error_token = tok; }
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ZYAN_ASSERT(cfg);
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ZYAN_ASSERT(parsed);
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// TODO: Once we have a decent hash map impl, refactor this to use it. The majority of for
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// loops through the argument list could be avoided.
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if (cfg->min_unnamed_args > cfg->max_unnamed_args)
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{
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return ZYAN_STATUS_INVALID_ARGUMENT;
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}
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// Check argument syntax.
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for (const ZyanArgParseDefinition* def = cfg->args; def && def->name; ++def)
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{
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// TODO: Duplicate check
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if (!def->name)
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{
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return ZYAN_STATUS_INVALID_ARGUMENT;
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}
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ZyanUSize arg_len = ZYAN_STRLEN(def->name);
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if (arg_len < 2 || def->name[0] != '-')
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{
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return ZYAN_STATUS_INVALID_ARGUMENT;
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}
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// Single dash arguments only accept a single char name.
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if (def->name[1] != '-' && arg_len != 2)
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{
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return ZYAN_STATUS_INVALID_ARGUMENT;
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}
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}
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// Initialize output vector.
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ZYAN_CHECK(ZyanVectorInitEx(parsed, sizeof(ZyanArgParseArg), cfg->argc, ZYAN_NULL, allocator,
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ZYAN_VECTOR_DEFAULT_GROWTH_FACTOR, ZYAN_VECTOR_DEFAULT_SHRINK_THRESHOLD));
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ZyanStatus err;
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ZyanBool accept_dash_args = ZYAN_TRUE;
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ZyanUSize num_unnamed_args = 0;
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for (ZyanUSize i = 1; i < cfg->argc; ++i)
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{
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const char* cur_arg = cfg->argv[i];
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ZyanUSize arg_len = ZYAN_STRLEN(cfg->argv[i]);
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// Double-dash argument?
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if (accept_dash_args && arg_len >= 2 && ZYAN_MEMCMP(cur_arg, "--", 2) == 0)
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{
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// GNU style end of argument parsing.
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if (arg_len == 2)
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{
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accept_dash_args = ZYAN_FALSE;
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}
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// Regular double-dash argument.
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else
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{
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// Allocate parsed argument struct.
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ZyanArgParseArg* parsed_arg;
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ZYAN_CHECK(ZyanVectorEmplace(parsed, (void**)&parsed_arg, ZYAN_NULL));
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ZYAN_MEMSET(parsed_arg, 0, sizeof(*parsed_arg));
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// Find corresponding argument definition.
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for (const ZyanArgParseDefinition* def = cfg->args; def && def->name; ++def)
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{
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if (ZYAN_STRCMP(def->name, cur_arg) == 0)
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{
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parsed_arg->def = def;
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break;
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}
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}
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// Search exhausted & argument not found. RIP.
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if (!parsed_arg->def)
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{
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err = ZYAN_STATUS_ARG_NOT_UNDERSTOOD;
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ZYAN_ERR_TOK(cur_arg);
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goto failure;
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}
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// Does the argument expect a value? If yes, consume next token.
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if (!parsed_arg->def->boolean)
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{
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if (i == cfg->argc - 1)
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{
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err = ZYAN_STATUS_ARG_MISSES_VALUE;
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ZYAN_ERR_TOK(cur_arg);
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goto failure;
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}
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parsed_arg->has_value = ZYAN_TRUE;
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ZYAN_CHECK(ZyanStringViewInsideBuffer(&parsed_arg->value, cfg->argv[++i]));
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}
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}
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// Continue parsing at next token.
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continue;
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}
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// Single-dash argument?
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// TODO: How to deal with just dashes? Current code treats it as unnamed arg.
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if (accept_dash_args && arg_len > 1 && cur_arg[0] == '-')
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{
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// Iterate argument token chars until there are either no more chars left
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// or we encounter a non-boolean argument, in which case we consume the
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// remaining chars as its value.
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for (const char* read_ptr = cur_arg + 1; *read_ptr; ++read_ptr)
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{
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// Allocate parsed argument struct.
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ZyanArgParseArg* parsed_arg;
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ZYAN_CHECK(ZyanVectorEmplace(parsed, (void**)&parsed_arg, ZYAN_NULL));
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ZYAN_MEMSET(parsed_arg, 0, sizeof(*parsed_arg));
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// Find corresponding argument definition.
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for (const ZyanArgParseDefinition* def = cfg->args; def && def->name; ++def)
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{
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if (ZYAN_STRLEN(def->name) == 2 &&
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def->name[0] == '-' &&
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def->name[1] == *read_ptr)
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{
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parsed_arg->def = def;
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break;
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}
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}
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// Search exhausted, no match found?
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if (!parsed_arg->def)
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{
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err = ZYAN_STATUS_ARG_NOT_UNDERSTOOD;
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ZYAN_ERR_TOK(cur_arg);
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goto failure;
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}
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// Requires value?
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if (!parsed_arg->def->boolean)
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{
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// If there are chars left, consume them (e.g. `-n1000`).
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if (read_ptr[1])
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{
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parsed_arg->has_value = ZYAN_TRUE;
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ZYAN_CHECK(ZyanStringViewInsideBuffer(&parsed_arg->value, read_ptr + 1));
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}
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// If not, consume next token (e.g. `-n 1000`).
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else
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{
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if (i == cfg->argc - 1)
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{
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err = ZYAN_STATUS_ARG_MISSES_VALUE;
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ZYAN_ERR_TOK(cur_arg)
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goto failure;
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}
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parsed_arg->has_value = ZYAN_TRUE;
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ZYAN_CHECK(ZyanStringViewInsideBuffer(&parsed_arg->value, cfg->argv[++i]));
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}
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// Either way, continue with next argument.
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goto continue_main_loop;
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}
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}
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}
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// Still here? We're looking at an unnamed argument.
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++num_unnamed_args;
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if (num_unnamed_args > cfg->max_unnamed_args)
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{
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err = ZYAN_STATUS_TOO_MANY_ARGS;
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ZYAN_ERR_TOK(cur_arg);
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goto failure;
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}
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// Allocate parsed argument struct.
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ZyanArgParseArg* parsed_arg;
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ZYAN_CHECK(ZyanVectorEmplace(parsed, (void**)&parsed_arg, ZYAN_NULL));
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ZYAN_MEMSET(parsed_arg, 0, sizeof(*parsed_arg));
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parsed_arg->has_value = ZYAN_TRUE;
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ZYAN_CHECK(ZyanStringViewInsideBuffer(&parsed_arg->value, cur_arg));
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continue_main_loop:;
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}
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// All tokens processed. Do we have enough unnamed arguments?
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if (num_unnamed_args < cfg->min_unnamed_args)
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{
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err = ZYAN_STATUS_TOO_FEW_ARGS;
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// No sensible error token for this error type.
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goto failure;
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}
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// Check whether all required arguments are present.
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ZyanUSize num_parsed_args;
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ZYAN_CHECK(ZyanVectorGetSize(parsed, &num_parsed_args));
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for (const ZyanArgParseDefinition* def = cfg->args; def && def->name; ++def)
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{
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if (!def->required) continue;
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ZyanBool arg_found = ZYAN_FALSE;
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for (ZyanUSize i = 0; i < num_parsed_args; ++i)
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{
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const ZyanArgParseArg* arg = ZYAN_NULL;
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ZYAN_CHECK(ZyanVectorGetPointer(parsed, i, (const void**)&arg));
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// Skip unnamed args.
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if (!arg->def) continue;
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if (arg->def == def)
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{
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arg_found = ZYAN_TRUE;
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break;
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}
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}
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if (!arg_found)
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{
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err = ZYAN_STATUS_REQUIRED_ARG_MISSING;
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ZYAN_ERR_TOK(def->name);
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goto failure;
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}
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}
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// Yay!
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ZYAN_ERR_TOK(ZYAN_NULL);
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return ZYAN_STATUS_SUCCESS;
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failure:
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ZYAN_CHECK(ZyanVectorDestroy(parsed));
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return err;
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# undef ZYAN_ERR_TOK
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}
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/* ============================================================================================== */
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