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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 void scan(struct aplwc_eval_context *);
static struct aplwc_token *emit(struct aplwc_eval_context *, enum aplwc_token_tag, size_t);
static bool at_end(struct aplwc_eval_context *);
static void skip_whitespace(struct aplwc_eval_context *);
static char peek(struct aplwc_eval_context *, size_t);
static void consume(struct aplwc_eval_context *, size_t);
static void give_up(struct aplwc_eval_context *);
static bool scan_syscmd(struct aplwc_eval_context *);
void
aplwc_scan_line(struct aplwc_eval_context *context, const char *line)
{
size_t linelen = strlen(line);
if(context->text){
size_t textlen = strlen(context->text);
context->text = context->aplwc->realloc(context->text, textlen + linelen + 2);
context->text[textlen] = '\n';
memcpy(context->text+textlen+1, line, linelen + 1);
}else{
context->text = context->aplwc->alloc(linelen+1);
memcpy(context->text, line, linelen + 1);
}
if(context->tokens){
for(size_t i = 0; i < context->n_tokens; i++)
context->aplwc->free(context->tokens[i]);
context->aplwc->free(context->tokens);
}
scan(context);
}
static void
scan(struct aplwc_eval_context *context)
{
context->n_tokens = 0;
context->tokens = NULL;
context->offset = 0;
context->length = strlen(context->text);
while(!at_end(context)){
bool scanned = false;
skip_whitespace(context);
if(at_end(context))
continue;
if(context->n_tokens == 0)
scanned |= scan_syscmd(context);
if(!scanned)
give_up(context);
}
}
static struct aplwc_token *
emit(struct aplwc_eval_context *context, enum aplwc_token_tag tag, size_t length)
{
struct aplwc_token *tok = context->aplwc->alloc(sizeof(*tok));
context->n_tokens++;
context->tokens = context->aplwc->realloc(context->tokens, sizeof(*context->tokens) * context->n_tokens);
context->tokens[context->n_tokens-1] = tok;
memset(tok, 0, sizeof(*tok));
tok->tag = tag;
tok->offset_start = context->offset;
tok->offset_end = tok->offset_start + length - 1;
consume(context, length);
return tok;
}
static bool
at_end(struct aplwc_eval_context *context)
{
return context->offset == context->length;
}
static void
skip_whitespace(struct aplwc_eval_context *context)
{
for(;;){
char c = peek(context, 0);
if((c == ' ') || (c == '\t'))
consume(context, 1);
else
break;
}
}
static char
peek(struct aplwc_eval_context *context, size_t offset)
{
size_t index = context->offset + offset;
if(index < context->length)
return context->text[index];
else
return 0;
}
static void
consume(struct aplwc_eval_context *context, size_t n)
{
context->offset += n;
}
static void
give_up(struct aplwc_eval_context *context)
{
emit(context, APLWC_TOKEN_ERROR, context->length - context->offset);
}
static bool
scan_syscmd(struct aplwc_eval_context *context)
{
if(peek(context, 0) != ')')
return false;
size_t len;
/* Scan the syscmd itself */
for(len = 1; !((peek(context, len) == 0) || (peek(context, len) == ' ')); len++);
emit(context, APLWC_TOKEN_SYSCMD, len);
/* Skip the leading whitespace */
skip_whitespace(context);
/* Take the rest of the line as arguments */
for(len = 0; !((peek(context, len) == 0) || (peek(context, len) == '\n')); len++)
printf("arglen = %zu\n", len);
if(len > 0)
emit(context, APLWC_TOKEN_SYSCMD_ARGS, len);
return true;
}
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