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#include <stdlib.h>
#include "typeutils.h"
#include "lex.h"
DECLARE_VEC(char*, StrVec)
typedef struct {
Token* ptr;
size_t len;
size_t pos;
} TokStream;
typedef enum {
STDIN_REDIR,
STDOUT_REDIR_TRUNC,
STDOUT_REDIR_APPEND,
} RedirKind;
typedef struct {
RedirKind kind;
union {
Word std_redir_filename;
} as;
} Redirect;
DECLARE_VEC(Redirect, RedirectVec)
typedef struct {
WordVec args;
RedirectVec redirects;
// TODO: prefix variable settings
} Command;
typedef enum {
CONN_PIPE,
CONN_EOL,
// TODO: add the |& thingy
} Connector;
typedef struct {
Command cmd;
Connector conn;
} PipelineElement;
DECLARE_VEC(PipelineElement, Pipeline)
Command parse_command(TokStream* toks) {
WordVec args = make_WordVec(256);
RedirectVec redirects = make_RedirectVec(256);
for (
Token curr_tok;
(curr_tok = toks->ptr[toks->pos], !(curr_tok.kind == TOK_SPECIAL && (curr_tok.as.spec == PIPE && curr_tok.as.spec == EOL)));
toks->pos++
) {
if (curr_tok.kind == TOK_SPECIAL) {
Token tok;
switch (curr_tok.as.spec) {
case WRITE_REDIR_TRUNC:
toks->pos++;
tok = toks->ptr[toks->pos];
if(tok.kind != TOK_WORD) exit(1);
push_to_RedirectVec(&redirects, (Redirect){.kind = STDOUT_REDIR_TRUNC, .as.std_redir_filename = tok.as.word});
break;
case WRITE_REDIR_APPEND:
toks->pos++;
tok = toks->ptr[toks->pos];
if(tok.kind != TOK_WORD) exit(1);
push_to_RedirectVec(&redirects, (Redirect){.kind = STDOUT_REDIR_APPEND, .as.std_redir_filename = tok.as.word});
break;
case READ_REDIR:
toks->pos++;
tok = toks->ptr[toks->pos];
if(tok.kind != TOK_WORD) exit(1);
push_to_RedirectVec(&redirects, (Redirect){.kind = STDOUT_REDIR_APPEND, .as.std_redir_filename = tok.as.word});
break;
default:
exit(69);
}
} else if (curr_tok.kind == TOK_WORD){
push_to_WordVec(&args, curr_tok.as.word);
}
}
return (Command){.args = args, .redirects = redirects};
}
Pipeline parse_tokstream(TokenVec toks) {
TokStream tokstream = {.ptr = toks.items, .len = toks.count, .pos = 0};
Pipeline result = make_Pipeline(256);
}
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