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/* Aplwc - A Programming Language With Constraints
*
* Copyright (C) 2026 Peter Mikkelsen <petermikkelsen10@gmail.com>
*
* This file is part of aplwc.
*
* Aplwc is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Aplwc is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with aplwc. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <aplwc.h>
#include "aplwc_internal.h"
static enum aplwc_token_tag peek(struct aplwc_eval_context *);
static struct aplwc_token *match(struct aplwc_eval_context *, enum aplwc_token_tag);
static void emit(struct aplwc_eval_context *, enum aplwc_ast_tag, struct aplwc_ast **);
static char *token_text(struct aplwc_eval_context *, struct aplwc_token *);
static void parse_syscmd(struct aplwc_eval_context *, struct aplwc_ast **);
void
aplwc_parse(struct aplwc_eval_context *context)
{
context->token_offset = 0;
if(peek(context) == APLWC_TOKEN_SYSCMD)
parse_syscmd(context, &context->ast);
if(context->ast == NULL)
emit(context, APLWC_AST_ERROR, &context->ast);
}
static enum aplwc_token_tag
peek(struct aplwc_eval_context *context)
{
enum aplwc_token_tag tag = -1;
if(context->token_offset < context->n_tokens)
tag = context->tokens[context->token_offset]->tag;
return tag;
}
static struct aplwc_token *
match(struct aplwc_eval_context *context, enum aplwc_token_tag tag)
{
struct aplwc_token *tok = NULL;
if(peek(context) == tag)
tok = context->tokens[context->token_offset++];
return tok;
}
static void
emit(struct aplwc_eval_context *context, enum aplwc_ast_tag tag, struct aplwc_ast **ast)
{
if((*ast) != NULL)
aplwc_free_ast(context->aplwc, *ast);
*ast = context->aplwc->alloc(sizeof(**ast));
memset(*ast, 0, sizeof(**ast));
(*ast)->tag = tag;
}
static char *
token_text(struct aplwc_eval_context *context, struct aplwc_token *tok)
{
size_t len = tok->offset_end - tok->offset_start + 1;
char *text = context->aplwc->alloc(len + 1);
memcpy(text, context->text + tok->offset_start, len);
text[len] = 0;
return text;
}
static void
parse_syscmd(struct aplwc_eval_context *context, struct aplwc_ast **ast)
{
struct aplwc_token *tok = match(context, APLWC_TOKEN_SYSCMD);
char *name = token_text(context, tok);
struct aplwc_syscmd *syscmd = aplwc_lookup_syscmd(context->aplwc, name+1);
context->aplwc->free(name);
if(syscmd){
emit(context, APLWC_AST_SYSCMD, ast);
(*ast)->data.syscmd.syscmd = syscmd;
(*ast)->data.syscmd.args = aplwc_strdup(context->aplwc, "");
}else
emit(context, APLWC_AST_ERROR, ast);
}
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