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#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include "syntax.h"
#include "utils.h"
#include "stages.h"
typedef struct {
StrVec completed_fields;
String open_buf;
} SplitBuilder;
void consolidate_split_builder(SplitBuilder* builder) {
if (builder->open_buf.count > 0) {
push_to_StrVec(&builder->completed_fields, inner(&builder->open_buf));
builder->open_buf = make_String(256);
}
}
void split_str_on_space(char* str, StrVec* result) {
String buf = make_String(256);
for (int pos = 0; str[pos] != '\0'; pos++) {
if (str[pos] == ' ') {
push_to_StrVec(result, inner(&buf));
buf = make_String(256);
} else {
push_to_String(&buf, str[pos]);
}
}
if (buf.count > 0) {
char* buf_str = inner(&buf);
push_to_StrVec(result, buf_str);
}
}
char* get_cmdsub_output(TokenVec sub_region, ShellState* shstate) {
int pipe_fds[2];
pipe(pipe_fds);
PipelineTree sub_tree = process_ast(sub_region, shstate);
// TODO: tree cleanup
// TODO: is this ok? where should we manage the pgid?
int pgid = -1;
Channel write_cha = {.fd = pipe_fds[1], .parent_proc_closable = false, .child_proc_closable = true};
execute_command_pipeline(*sub_tree.root, STDIN_CHA, write_cha, true, &pgid, shstate);
close(pipe_fds[1]);
String output_buf = make_String(256);
char str_buf[256];
ssize_t len;
while ((len = read(pipe_fds[0], str_buf, sizeof(str_buf))) > 0) {
append_str_to_String(&output_buf, str_buf);
}
close(pipe_fds[0]);
return inner(&output_buf);
}
void process_chunk(Chunk chunk, SplitBuilder* builder, ShellState* shstate) {
assert(!(chunk.qmode == SINGLE_Q && chunk.kind != CHUNK_LIT));
char* chunk_str;
switch (chunk.kind) {
case CHUNK_LIT:
chunk_str = chunk.as.lit_str;
break;
case CHUNK_VAR:
chunk_str = get_var(chunk.as.varname, shstate);
break;
case CHUNK_CMDSUB:
chunk_str = get_cmdsub_output(*(TokenVec*)chunk.as.cmdsub_toks, shstate);
break;
default:
exit(77);
}
if (chunk.qmode == UN_Q) {
StrVec split_str = make_StrVec(32);
split_str_on_space(chunk_str, &split_str);
append_str_to_String(&builder->open_buf, *get_from_StrVec(&split_str, 0));
consolidate_split_builder(builder);
for (int i = 1; i < split_str.count; i++) {
push_to_StrVec(&builder->completed_fields, *get_from_StrVec(&split_str, i));
}
} else {
append_str_to_String(&builder->open_buf, chunk_str);
}
}
StrVec process_word(Word word, ShellState* shstate) {
SplitBuilder split_bui = {.completed_fields = make_StrVec(256), .open_buf = make_String(256)};
for (int i = 0; i < word.count; i++) {
Chunk chunk = *get_from_Word(&word, i);
process_chunk(chunk, &split_bui, shstate);
}
consolidate_split_builder(&split_bui);
return split_bui.completed_fields;
}
typedef struct {
TokenKind kind;
union {
char* word;
SpecialToken spec;
} as;
} ExpandedToken;
DECLARE_VEC(ExpandedToken, ExpandedTokenVec)
Pipeline* process_token_sequence(TokenVec tokens, PipelineVec* pl_pool, ShellState* shstate) {
ExpandedTokenVec exp_tokens = make_ExpandedTokenVec(256);
for (int m = 0; m < tokens.count; m++) {
Token tok = *get_from_TokenVec(&tokens, m);
StrVec strs;
switch (tok.kind) {
case TOK_SPEC:
push_to_ExpandedTokenVec(&exp_tokens, (ExpandedToken){.kind = TOK_SPEC, .as.spec = tok.as.spec});
break;
case TOK_WORD:
strs = process_word(tok.as.word, shstate);
for (int n = 0; n < strs.count; n++) {
push_to_ExpandedTokenVec(&exp_tokens, (ExpandedToken){.kind = TOK_WORD, .as.word = *get_from_StrVec(&strs, n)});
}
}
}
Pipeline pl = make_Pipeline(256);
size_t tok_pos = 0;
PlCommand curr_cmd = {.args = make_ArgVec(256), .redirects = make_RedirectVec(256), .conn = CONN_EOL};
PlCommand* root_pl;
for (int i = 0; i < exp_tokens.count; i++) {
ExpandedToken curr_tok = *get_from_ExpandedTokenVec(&exp_tokens, i);
ExpandedToken next_tok;
Redirect rd;
Pipeline* sub_pl;
switch (curr_tok.kind) {
case TOK_WORD:
push_to_ArgVec(&curr_cmd.args, (Arg){.kind = ARG_LIT, .as.lit_str = curr_tok.as.word});
break;
case TOK_SPEC:
switch (curr_tok.as.spec.kind) {
case SPEC_OP:
switch (curr_tok.as.spec.as.op) {
case OP_PIPE:
curr_cmd.conn = CONN_PIPE;
push_to_Pipeline(&pl, curr_cmd);
curr_cmd = (PlCommand){.args = make_ArgVec(256), .redirects = make_RedirectVec(256), .conn = CONN_EOL};
break;
case OP_EOL:
push_to_Pipeline(&pl, curr_cmd);
break;
case OP_REDIR_R:
next_tok = *get_from_ExpandedTokenVec(&exp_tokens, ++i);
assert(next_tok.kind == TOK_WORD);
rd = (Redirect){.kind = REDIR_READ, .as.filename = next_tok.as.word};
push_to_RedirectVec(&curr_cmd.redirects, rd);
break;
case OP_REDIR_W_APPEND:
next_tok = *get_from_ExpandedTokenVec(&exp_tokens, ++i);
assert(next_tok.kind == TOK_WORD);
rd = (Redirect){.kind = REDIR_WRITE_APPEND, .as.filename = next_tok.as.word};
push_to_RedirectVec(&curr_cmd.redirects, rd);
break;
case OP_REDIR_W_TRUNC:
next_tok = *get_from_ExpandedTokenVec(&exp_tokens, ++i);
assert(next_tok.kind == TOK_WORD);
rd = (Redirect){.kind = REDIR_WRITE_TRUNC, .as.filename = next_tok.as.word};
push_to_RedirectVec(&curr_cmd.redirects, rd);
break;
default:
exit(63);
}
break;
case SPEC_SUB_IN:
sub_pl = process_token_sequence(*(TokenVec*)curr_tok.as.spec.as.proc_sub_region, pl_pool, shstate);
push_to_ArgVec(&curr_cmd.args, (Arg){.kind = ARG_PS_IN, .as.sub_pipeline = sub_pl});
break;
case SPEC_SUB_OUT:
sub_pl = process_token_sequence(*(TokenVec*)curr_tok.as.spec.as.proc_sub_region, pl_pool, shstate);
push_to_ArgVec(&curr_cmd.args, (Arg){.kind = ARG_PS_OUT, .as.sub_pipeline = sub_pl});
break;
}
}
}
return push_to_PipelineVec(pl_pool, pl);
}
PipelineTree process_ast(TokenVec root, ShellState* shstate) {
PipelineVec pls = make_PipelineVec(256);
Pipeline* root_pl = process_token_sequence(root, &pls, shstate);
return (PipelineTree){.pl_pool = pls, root_pl};
// TODO: ast cleanup
}
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