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Cleanup thrashing around in parser_t. New parser execution lives in

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parse_execution.cpp
This commit is contained in:
ridiculousfish 2013-12-26 12:55:10 -08:00
parent 924b8cbe24
commit 562946d055
4 changed files with 81 additions and 730 deletions
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107
parse_execution.cpp
View file

@ -10,6 +10,7 @@
#include "parser.h"
#include "expand.h"
#include "wutil.h"
#include "exec.h"
#include "path.h"
@ -24,7 +25,7 @@ wcstring parse_execution_context_t::get_source(const parse_node_t &node) const
return node.get_source(this->src);
}
const parse_node_t *parse_execution_context_t::get_child(const parse_node_t &parent, node_offset_t which, parse_token_type_t expected_type)
const parse_node_t *parse_execution_context_t::get_child(const parse_node_t &parent, node_offset_t which, parse_token_type_t expected_type) const
{
return this->tree.get_child(parent, which, expected_type);
}
@ -91,6 +92,8 @@ bool parse_execution_context_t::append_error(const parse_node_t &node, const wch
process_t *parse_execution_context_t::create_plain_process(job_t *job, const parse_node_t &statement)
{
bool errored = false;
/* Get the decoration */
assert(statement.type == symbol_plain_statement);
@ -99,29 +102,37 @@ process_t *parse_execution_context_t::create_plain_process(job_t *job, const par
bool got_cmd = tree.command_for_plain_statement(statement, src, &cmd);
assert(got_cmd);
/* Expand it as a command */
/* Expand it as a command. Return NULL on failure. */
bool expanded = expand_one(cmd, EXPAND_SKIP_CMDSUBST | EXPAND_SKIP_VARIABLES);
if (! expanded)
{
append_error(statement, ILLEGAL_CMD_ERR_MSG, cmd.c_str());
return 0;
errored = append_error(statement, ILLEGAL_CMD_ERR_MSG, cmd.c_str());
}
if (errored)
return NULL;
/* The list of arguments. The command is the first argument. TODO: count hack */
const parse_node_t *unmatched_wildcard = NULL;
wcstring_list_t argument_list = this->determine_arguments(statement, &unmatched_wildcard);
argument_list.insert(argument_list.begin(), cmd);
/* We were not able to expand any wildcards. Here is the first one that failed */
/* If we were not able to expand any wildcards, here is the first one that failed */
if (unmatched_wildcard != NULL)
{
job_set_flag(job, JOB_WILDCARD_ERROR, 1);
proc_set_last_status(STATUS_UNMATCHED_WILDCARD);
append_error(*unmatched_wildcard, WILDCARD_ERR_MSG, unmatched_wildcard->get_source(src).c_str());
errored = append_error(*unmatched_wildcard, WILDCARD_ERR_MSG, unmatched_wildcard->get_source(src).c_str());
}
if (errored)
return NULL;
/* The set of IO redirections that we construct for the process */
const io_chain_t process_io_chain = this->determine_io_chain(statement);
io_chain_t process_io_chain;
errored = ! this->determine_io_chain(statement, &process_io_chain);
if (errored)
return NULL;
/* Determine the process type, which depends on the statement decoration (command, builtin, etc) */
enum parse_statement_decoration_t decoration = tree.decoration_for_plain_statement(statement);
@ -165,16 +176,21 @@ process_t *parse_execution_context_t::create_plain_process(job_t *job, const par
if (! has_command)
{
/* TODO: support fish_command_not_found, implicit cd, etc. here */
errored = true;
}
return NULL;
}
/* Return the process */
process_t *result = new process_t();
result->type = process_type;
result->set_argv(argument_list);
result->set_io_chain(process_io_chain);
result->actual_cmd = actual_cmd;
/* Return the process, or NULL on error */
process_t *result = NULL;
if (! errored)
{
result = new process_t();
result->type = process_type;
result->set_argv(argument_list);
result->set_io_chain(process_io_chain);
result->actual_cmd = actual_cmd;
}
return result;
}
@ -252,9 +268,10 @@ wcstring_list_t parse_execution_context_t::determine_arguments(const parse_node_
return argument_list;
}
io_chain_t parse_execution_context_t::determine_io_chain(const parse_node_t &statement)
bool parse_execution_context_t::determine_io_chain(const parse_node_t &statement, io_chain_t *out_chain)
{
io_chain_t result;
bool errored = false;
/* Get all redirection nodes underneath the statement */
const parse_node_tree_t::parse_node_list_t redirect_nodes = tree.find_nodes(statement, symbol_redirection);
@ -271,7 +288,7 @@ io_chain_t parse_execution_context_t::determine_io_chain(const parse_node_t &sta
if (! target_expanded || target.empty())
{
/* Should improve this error message */
this->append_error(redirect_node,
errored = append_error(redirect_node,
_(L"Invalid redirection target: %ls"),
target.c_str());
}
@ -295,7 +312,7 @@ io_chain_t parse_execution_context_t::determine_io_chain(const parse_node_t &sta
int old_fd = fish_wcstoi(target.c_str(), &end, 10);
if (old_fd < 0 || errno || *end)
{
this->append_error(redirect_node,
errored = append_error(redirect_node,
_(L"Requested redirection to something that is not a file descriptor %ls"),
target.c_str());
}
@ -333,7 +350,12 @@ io_chain_t parse_execution_context_t::determine_io_chain(const parse_node_t &sta
result.push_back(new_io);
}
}
return result;
if (out_chain && ! errored)
{
std::swap(*out_chain, result);
}
return ! errored;
}
process_t *parse_execution_context_t::create_boolean_process(job_t *job, const parse_node_t &bool_statement)
@ -416,6 +438,7 @@ process_t *parse_execution_context_t::create_job_process(job_t *job, const parse
case symbol_decorated_statement:
{
/* Get the plain statement. It will pull out the decoration itself */
const parse_node_t &plain_statement = tree.find_child(specific_statement, symbol_plain_statement);
result = this->create_plain_process(job, plain_statement);
break;
@ -431,7 +454,7 @@ process_t *parse_execution_context_t::create_job_process(job_t *job, const parse
}
void parse_execution_context_t::populate_job_from_job_node(job_t *j, const parse_node_t &job_node)
bool parse_execution_context_t::populate_job_from_job_node(job_t *j, const parse_node_t &job_node)
{
assert(job_node.type == symbol_job);
@ -470,6 +493,9 @@ void parse_execution_context_t::populate_job_from_job_node(job_t *j, const parse
last_process = last_process->next;
job_cont = get_child(*job_cont, 2, symbol_job_continuation);
}
/* Return success */
return ! process_errored;
}
int parse_execution_context_t::run_1_job(const parse_node_t &job_node)
@ -515,8 +541,10 @@ int parse_execution_context_t::run_1_job(const parse_node_t &job_node)
parser->current_block()->job = j;
this->populate_job_from_job_node(j, job_node);
/* Populate the job. This may fail for reasons like command_not_found */
bool process_errored = ! this->populate_job_from_job_node(j, job_node);
/* Store time it took to 'parse' the command */
if (do_profile)
{
parse_time = get_time();
@ -524,34 +552,49 @@ int parse_execution_context_t::run_1_job(const parse_node_t &job_node)
profile_item->skipped=parser->current_block()->skip;
}
/* Check to see if this contained any external commands */
bool job_contained_external_command = false;
for (const process_t *proc = j->first_process; proc != NULL; proc = proc->next)
if (! process_errored)
{
if (proc->type == EXTERNAL)
/* Check to see if this contained any external commands */
bool job_contained_external_command = false;
for (const process_t *proc = j->first_process; proc != NULL; proc = proc->next)
{
job_contained_external_command = true;
break;
if (proc->type == EXTERNAL)
{
job_contained_external_command = true;
break;
}
}
/* Actually execute the job */
exec_job(*this->parser, j);
/* Only external commands require a new fishd barrier */
if (!job_contained_external_command)
{
set_proc_had_barrier(false);
}
}
/* Only external commands require a new fishd barrier */
if (!job_contained_external_command)
set_proc_had_barrier(false);
/* Need support for skipped_exec here */
if (do_profile)
{
exec_time = get_time();
profile_item->level=eval_level;
profile_item->parse = (int)(parse_time-start_time);
profile_item->exec=(int)(exec_time-parse_time);
profile_item->skipped = process_errored;
}
/* Set the last status to 1 if the job could not be executed */
if (process_errored)
proc_set_last_status(1);
const int ret = proc_get_last_status();
/* Clean up jobs. Do this after we've determined the return value, since this may trigger event handlers */
job_reap(0);
return proc_get_last_status();
/* All done */
return ret;
}
void parse_execution_context_t::run_job_list(const parse_node_t &job_list_node)

10
parse_execution.h
View file

@ -35,9 +35,9 @@ class parse_execution_context_t
/* Report an error. Always returns true. */
bool append_error(const parse_node_t &node, const wchar_t *fmt, ...);
/* Utilities */
wcstring get_source(const parse_node_t &node) const;
const parse_node_t *get_child(const parse_node_t &parent, node_offset_t which, parse_token_type_t expected_type = token_type_invalid);
const parse_node_t *get_child(const parse_node_t &parent, node_offset_t which, parse_token_type_t expected_type = token_type_invalid) const;
node_offset_t get_offset(const parse_node_t &node) const;
process_t *create_job_process(job_t *job, const parse_node_t &statement_node);
@ -48,11 +48,13 @@ class parse_execution_context_t
void run_while_process(const parse_node_t &header, const parse_node_t &statement);
wcstring_list_t determine_arguments(const parse_node_t &parent, const parse_node_t **out_unmatched_wildcard_node);
io_chain_t determine_io_chain(const parse_node_t &statement);
/* Determines the IO chain. Returns true on success, false on error */
bool determine_io_chain(const parse_node_t &statement, io_chain_t *out_chain);
int run_1_job(const parse_node_t &job_node);
void run_job_list(const parse_node_t &job_list_node);
void populate_job_from_job_node(job_t *j, const parse_node_t &job_node);
bool populate_job_from_job_node(job_t *j, const parse_node_t &job_node);
void eval_next_stack_elem();

673
parser.cpp
View file

@ -1643,390 +1643,6 @@ void parser_t::parse_job_argument_list(process_t *p,
p->set_io_chain(process_io_chain);
}
/*
static void print_block_stack( block_t *b )
{
if( !b )
return;
print_block_stack( b->outer );
debug( 0, L"Block type %ls, skip: %d", parser_get_block_desc( b->type ), b->skip );
}
*/
process_t *parser_t::create_boolean_process(job_t *job, const parse_node_t &bool_statement, const parser_context_t &ctx)
{
// Handle a boolean statement
bool skip_job = false;
assert(bool_statement.type == symbol_boolean_statement);
switch (bool_statement.production_idx)
{
// These magic numbers correspond to productions for boolean_statement
case 0:
// AND. Skip if the last job failed.
skip_job = (proc_get_last_status() != 0);
break;
case 1:
// OR. Skip if the last job succeeded.
skip_job = (proc_get_last_status() == 0);
break;
case 2:
// NOT. Negate it.
job_set_flag(job, JOB_NEGATE, !job_get_flag(job, JOB_NEGATE));
break;
default:
{
fprintf(stderr, "Unexpected production in boolean statement\n");
PARSER_DIE();
break;
}
}
process_t *result = NULL;
if (! skip_job)
{
const parse_node_t &subject = *ctx.tree.get_child(bool_statement, 1, symbol_statement);
result = this->create_job_process(job, subject, ctx);
}
return result;
}
process_t *parser_t::create_for_process(job_t *job, const parse_node_t &header, const parse_node_t &statement, const parser_context_t &ctx)
{
return NULL;
}
process_t *parser_t::create_while_process(job_t *job, const parse_node_t &header, const parse_node_t &statement, const parser_context_t &ctx)
{
return NULL;
}
process_t *parser_t::create_begin_process(job_t *job, const parse_node_t &header, const parse_node_t &statement, const parser_context_t &ctx)
{
return NULL;
}
process_t *parser_t::create_plain_process(job_t *job, const parse_node_t &statement, const parser_context_t &ctx)
{
/* Get the decoration */
assert(statement.type == symbol_plain_statement);
/* Get the command. We expect to always get it here. */
wcstring cmd;
bool got_cmd = ctx.tree.command_for_plain_statement(statement, ctx.src, &cmd);
assert(got_cmd);
/* Expand it as a command */
bool expanded = expand_one(cmd, EXPAND_SKIP_CMDSUBST | EXPAND_SKIP_VARIABLES);
if (! expanded)
{
error(SYNTAX_ERROR,
statement.source_start,
ILLEGAL_CMD_ERR_MSG,
cmd.c_str());
return 0;
}
/* The list of arguments. The command is the first argument. TODO: count hack */
const parse_node_t *unmatched_wildcard = NULL;
wcstring_list_t argument_list = this->determine_arguments(statement, &unmatched_wildcard, ctx);
argument_list.insert(argument_list.begin(), cmd);
/* We were not able to expand any wildcards. Here is the first one that failed */
if (unmatched_wildcard != NULL)
{
job_set_flag(job, JOB_WILDCARD_ERROR, 1);
proc_set_last_status(STATUS_UNMATCHED_WILDCARD);
error(EVAL_ERROR, unmatched_wildcard->source_start, WILDCARD_ERR_MSG, unmatched_wildcard->get_source(ctx.src).c_str());
}
/* The set of IO redirections that we construct for the process */
const io_chain_t process_io_chain = this->determine_io_chain(statement, ctx);
/* Determine the process type, which depends on the statement decoration (command, builtin, etc) */
enum parse_statement_decoration_t decoration = ctx.tree.decoration_for_plain_statement(statement);
enum process_type_t process_type = EXTERNAL;
/* exec hack */
if (decoration != parse_statement_decoration_command && cmd == L"exec")
{
/* Either 'builtin exec' or just plain 'exec', and definitely not 'command exec'. Note we don't allow overriding exec with a function. */
process_type = INTERNAL_EXEC;
}
else if (decoration == parse_statement_decoration_command)
{
/* Always a command */
process_type = EXTERNAL;
}
else if (decoration == parse_statement_decoration_builtin)
{
/* What happens if this builtin is not valid? */
process_type = INTERNAL_BUILTIN;
}
else if (function_exists(cmd))
{
process_type = INTERNAL_FUNCTION;
}
else if (builtin_exists(cmd))
{
process_type = INTERNAL_BUILTIN;
}
else
{
process_type = EXTERNAL;
}
wcstring actual_cmd;
if (process_type == EXTERNAL)
{
/* Determine the actual command. Need to support implicit cd here */
bool has_command = path_get_path(cmd, &actual_cmd);
if (! has_command)
{
/* TODO: support fish_command_not_found, implicit cd, etc. here */
}
}
/* Return the process */
process_t *result = new process_t();
result->type = process_type;
result->set_argv(argument_list);
result->set_io_chain(process_io_chain);
result->actual_cmd = actual_cmd;
return result;
}
/* Determine the list of arguments, expanding stuff. If we have a wildcard and none could be expanded, return the unexpandable wildcard node by reference. */
wcstring_list_t parser_t::determine_arguments(const parse_node_t &statement, const parse_node_t **out_unmatched_wildcard_node, const parser_context_t &ctx)
{
wcstring_list_t argument_list;
/* Whether we failed to match any wildcards, and succeeded in matching any wildcards */
bool unmatched_wildcard = false, matched_wildcard = false;
/* First node that failed to expand as a wildcard (if any) */
const parse_node_t *unmatched_wildcard_node = NULL;
/* Get all argument nodes underneath the statement */
const parse_node_tree_t::parse_node_list_t argument_nodes = ctx.tree.find_nodes(statement, symbol_argument);
argument_list.reserve(argument_nodes.size());
for (size_t i=0; i < argument_nodes.size(); i++)
{
const parse_node_t &arg_node = *argument_nodes.at(i);
/* Expect all arguments to have source */
assert(arg_node.has_source());
const wcstring arg_str = arg_node.get_source(ctx.src);
/* Expand this string */
std::vector<completion_t> arg_expanded;
int expand_ret = expand_string(arg_str, arg_expanded, 0);
switch (expand_ret)
{
case EXPAND_ERROR:
{
error(SYNTAX_ERROR,
arg_node.source_start,
_(L"Could not expand string '%ls'"),
arg_str.c_str());
break;
}
case EXPAND_WILDCARD_NO_MATCH:
{
/* Store the node that failed to expand */
unmatched_wildcard = true;
if (! unmatched_wildcard_node)
{
unmatched_wildcard_node = &arg_node;
}
break;
}
case EXPAND_WILDCARD_MATCH:
{
matched_wildcard = true;
break;
}
case EXPAND_OK:
{
break;
}
}
/* Now copy over any expanded arguments */
for (size_t i=0; i < arg_expanded.size(); i++)
{
argument_list.push_back(arg_expanded.at(i).completion);
}
}
/* Return if we had a wildcard problem */
if (unmatched_wildcard && ! matched_wildcard)
{
*out_unmatched_wildcard_node = unmatched_wildcard_node;
}
return argument_list;
}
io_chain_t parser_t::determine_io_chain(const parse_node_t &statement,const parser_context_t &ctx)
{
io_chain_t result;
/* Get all redirection nodes underneath the statement */
const parse_node_tree_t::parse_node_list_t redirect_nodes = ctx.tree.find_nodes(statement, symbol_redirection);
for (size_t i=0; i < redirect_nodes.size(); i++)
{
const parse_node_t &redirect_node = *redirect_nodes.at(i);
int source_fd = -1; /* source fd */
wcstring target; /* file path or target fd */
enum token_type redirect_type = ctx.tree.type_for_redirection(redirect_node, ctx.src, &source_fd, &target);
/* PCA: I can't justify this EXPAND_SKIP_VARIABLES flag. It was like this when I got here. */
bool target_expanded = expand_one(target, no_exec ? EXPAND_SKIP_VARIABLES : 0);
if (! target_expanded || target.empty())
{
/* Should improve this error message */
error(SYNTAX_ERROR,
redirect_node.source_start,
_(L"Invalid redirection target: %ls"),
target.c_str());
}
/* Generate the actual IO redirection */
shared_ptr<io_data_t> new_io;
assert(redirect_type != TOK_NONE);
switch (redirect_type)
{
case TOK_REDIRECT_FD:
{
if (target == L"-")
{
new_io.reset(new io_close_t(source_fd));
}
else
{
wchar_t *end = NULL;
errno = 0;
int old_fd = fish_wcstoi(target.c_str(), &end, 10);
if (old_fd < 0 || errno || *end)
{
error(SYNTAX_ERROR,
redirect_node.source_start,
_(L"Requested redirection to something that is not a file descriptor %ls"),
target.c_str());
}
else
{
new_io.reset(new io_fd_t(source_fd, old_fd));
}
}
break;
}
case TOK_REDIRECT_OUT:
case TOK_REDIRECT_APPEND:
case TOK_REDIRECT_IN:
case TOK_REDIRECT_NOCLOB:
{
int oflags = oflags_for_redirection_type(redirect_type);
io_file_t *new_io_file = new io_file_t(source_fd, target, oflags);
new_io.reset(new_io_file);
break;
}
default:
{
// Should be unreachable
fprintf(stderr, "Unexpected redirection type %ld. aborting.\n", (long)redirect_type);
PARSER_DIE();
break;
}
}
/* Append the new_io if we got one */
if (new_io.get() != NULL)
{
result.push_back(new_io);
}
}
return result;
}
/* Returns a process_t allocated with new. It's the caller's responsibility to delete it (!) */
process_t *parser_t::create_job_process(job_t *job, const parse_node_t &statement_node, const parser_context_t &ctx)
{
assert(statement_node.type == symbol_statement);
assert(statement_node.child_count == 1);
// Get the "specific statement" which is boolean / block / if / switch / decorated
const parse_node_t &specific_statement = *ctx.tree.get_child(statement_node, 0);
process_t *result = NULL;
switch (specific_statement.type)
{
case symbol_boolean_statement:
{
result = this->create_boolean_process(job, specific_statement, ctx);
break;
}
case symbol_block_statement:
{
const parse_node_t &header = *ctx.tree.get_child(specific_statement, 0, symbol_block_header);
const parse_node_t &specific_header = *ctx.tree.get_child(header, 0);
switch (specific_header.type)
{
case symbol_for_header:
result = this->create_for_process(job, specific_header, specific_statement, ctx);
break;
case symbol_while_header:
result = this->create_while_process(job, specific_header, specific_statement, ctx);
break;
case symbol_function_header:
// No process is associated with creating a function
// TODO: create the darn function!
result = NULL;
break;
case symbol_begin_header:
result = this->create_begin_process(job, specific_header, specific_statement, ctx);
break;
default:
fprintf(stderr, "Unexpected header type\n");
PARSER_DIE();
break;
}
break;
}
case symbol_decorated_statement:
{
const parse_node_t &plain_statement = ctx.tree.find_child(specific_statement, symbol_plain_statement);
result = this->create_plain_process(job, plain_statement, ctx);
break;
}
default:
fprintf(stderr, "'%ls' not handled by new parser yet\n", specific_statement.describe().c_str());
}
return result;
}
/**
Fully parse a single job. Does not call exec on it, but any command substitutions in the job will be executed.
@ -2727,88 +2343,6 @@ static bool job_should_skip_elseif(const job_t *job, const block_t *current_bloc
}
}
/**
Evaluates a job from a node tree.
*/
void parser_t::eval_job(const parse_node_t &job_node, const parser_context_t &ctx)
{
assert(job_node.type == symbol_job);
this->job_start_pos = (int)job_node.source_start;
// Get terminal modes
struct termios tmodes = {};
if (get_is_interactive())
{
if (tcgetattr(STDIN_FILENO, &tmodes))
{
// need real error handling here
wperror(L"tcgetattr");
return;
}
}
/* Track whether we had an error */
bool process_errored = false;
/* Profiling support */
long long t1 = 0, t2 = 0, t3 = 0;
const bool do_profile = profile;
profile_item_t *profile_item = NULL;
if (do_profile)
{
profile_item = new profile_item_t();
profile_item->skipped = 1;
profile_items.push_back(profile_item);
t1 = get_time();
}
job_t *j = this->job_create();
job_set_flag(j, JOB_FOREGROUND, 1);
job_set_flag(j, JOB_TERMINAL, job_get_flag(j, JOB_CONTROL));
job_set_flag(j, JOB_TERMINAL, job_get_flag(j, JOB_CONTROL) \
&& (!is_subshell && !is_event));
job_set_flag(j, JOB_SKIP_NOTIFICATION, is_subshell \
|| is_block \
|| is_event \
|| (!get_is_interactive()));
current_block()->job = j;
/* Tell the job what its command is */
j->set_command(job_node.get_source(ctx.src));
/* We are going to construct process_t structures for every statement in the job. Get the first statement. */
const parse_node_t *statement_node = ctx.tree.get_child(job_node, 0, symbol_statement);
assert(statement_node != NULL);
/* Create the process (may fail!) */
j->first_process = this->create_job_process(j, *statement_node, ctx);
if (j->first_process == NULL)
process_errored = true;
/* Construct process_ts for job continuations (pipelines), by walking the list until we hit the terminal (empty) job continuationf */
const parse_node_t *job_cont = ctx.tree.get_child(job_node, 1, symbol_job_continuation);
process_t *last_process = j->first_process;
while (! process_errored && job_cont != NULL && job_cont->child_count > 0)
{
assert(job_cont->type == symbol_job_continuation);
/* Get the statement node and make a process from it */
const parse_node_t *statement_node = ctx.tree.get_child(*job_cont, 1, symbol_statement);
assert(statement_node != NULL);
/* Store the new process (and maybe with an error) */
last_process->next = this->create_job_process(j, *statement_node, ctx);
if (last_process->next == NULL)
process_errored = true;
/* Link the process and get the next continuation */
last_process = last_process->next;
job_cont = ctx.tree.get_child(*job_cont, 2, symbol_job_continuation);
}
}
/**
Evaluates a job from the specified tokenizer. First calls
parse_job to parse the job and then calls exec to execute it.
@ -3050,213 +2584,6 @@ void parser_t::eval_job(tokenizer_t *tok)
job_reap(0);
}
static void push_all_children(std::vector<node_offset_t> *execution_stack, const parse_node_t &node)
{
// push nodes in reverse order, so the first node ends up on top
unsigned child_idx = node.child_count;
while (child_idx--)
{
execution_stack->push_back(node.child_offset(child_idx));
}
}
void parser_t::execute_next(std::vector<node_offset_t> *execution_stack, const parser_context_t &ctx)
{
assert(execution_stack != NULL);
assert(! execution_stack->empty());
/* Get the offset of the next node and remove it from the stack */
node_offset_t next_offset = execution_stack->back();
execution_stack->pop_back();
/* Get the node */
assert(next_offset < ctx.tree.size());
const parse_node_t &node = ctx.tree.at(next_offset);
/* Do something with it */
switch (node.type)
{
case symbol_job_list:
// These correspond to the three productions of job_list
switch (node.production_idx)
{
case 0: // empty
break;
case 1: //job, job_list
push_all_children(execution_stack, node);
break;
case 2: //blank line, job_list
execution_stack->push_back(node.child_offset(1));
break;
default: //if we get here, it means more productions have been added to job_list, which is bad
PARSER_DIE();
break;
}
break;
case symbol_job: //statement, job_continuation
push_all_children(execution_stack, node);
break;
case symbol_job_continuation:
switch (node.production_idx)
{
case 0: //empty
break;
case 1: //pipe, statement, job_continuation
execution_stack->push_back(node.child_offset(2));
execution_stack->push_back(node.child_offset(1));
break;
default:
PARSER_DIE();
break;
}
break;
}
}
/* Executes the job list at the given node offset */
void parser_t::execute_job_list(node_offset_t idx, const parser_context_t &ctx)
{
assert(idx < ctx.tree.size());
const parse_node_t *job_list = &ctx.tree.at(idx);
assert(job_list->type == symbol_job_list);
while (job_list != NULL)
{
// These correspond to the three productions of job_list
// Try pulling out a job
const parse_node_t *job = NULL;
switch (job_list->production_idx)
{
case 0: // empty
job_list = NULL;
break;
case 1: //job, job_list
job = ctx.tree.get_child(*job_list, 0, symbol_job);
job_list = ctx.tree.get_child(*job_list, 1, symbol_job_list);
break;
case 2: //blank line, job_list
job = NULL;
job_list = ctx.tree.get_child(*job_list, 1, symbol_job_list);
break;
default: //if we get here, it means more productions have been added to job_list, which is bad
PARSER_DIE();
}
if (job != NULL)
{
this->eval_job(*job, ctx);
}
}
}
int parser_t::eval2(const wcstring &cmd_str, const io_chain_t &io, enum block_type_t block_type)
{
parser_context_t mut_ctx;
mut_ctx.src = cmd_str;
/* Parse the tree */
if (! parse_t::parse(cmd_str, parse_flag_none, &mut_ctx.tree, NULL))
{
return 1;
}
/* Make a const version for safety's sake */
const parser_context_t &ctx = mut_ctx;
CHECK_BLOCK(1);
/* Record the current chain so we can put it back later */
scoped_push<io_chain_t> block_io_push(&block_io, io);
scoped_push<wcstring_list_t> forbidden_function_push(&forbidden_function);
const size_t forbid_count = forbidden_function.size();
const block_t * const start_current_block = this->current_block();
/* Do some stuff I haven't figured out yet */
job_reap(0);
/* Only certain blocks are allowed */
if ((block_type != TOP) &&
(block_type != SUBST))
{
debug(1,
INVALID_SCOPE_ERR_MSG,
parser_t::get_block_desc(block_type));
bugreport();
return 1;
}
eval_level++;
this->push_block(new scope_block_t(block_type));
error_code = 0;
event_fire(NULL);
/* Execute the top level job list */
execute_job_list(0, ctx);
parser_t::pop_block();
while (start_current_block != this->current_block())
{
if (this->current_block() == NULL)
{
debug(0,
_(L"End of block mismatch. Program terminating."));
bugreport();
FATAL_EXIT();
break;
}
if ((!error_code) && (!exit_status()) && (!proc_get_last_status()))
{
//debug( 2, L"Status %d\n", proc_get_last_status() );
debug(1,
L"%ls", parser_t::get_block_desc(current_block()->type()));
debug(1,
BLOCK_END_ERR_MSG);
fwprintf(stderr, L"%ls", parser_t::current_line());
const wcstring h = builtin_help_get(*this, L"end");
if (h.size())
fwprintf(stderr, L"%ls", h.c_str());
break;
}
parser_t::pop_block();
}
this->print_errors_stderr();
while (forbidden_function.size() > forbid_count)
parser_t::allow_function();
/*
Restore previous eval state
*/
eval_level--;
int code=error_code;
error_code=0;
job_reap(0);
return code;
}
int parser_t::eval(const wcstring &cmd_str, const io_chain_t &io, enum block_type_t block_type)
{

21
parser.h
View file

@ -271,12 +271,6 @@ struct profile_item_t
struct tokenizer_t;
struct parser_context_t
{
parse_node_tree_t tree;
wcstring src;
};
class parser_t
{
friend class parse_execution_context_t;
@ -327,22 +321,11 @@ private:
parser_t(const parser_t&);
parser_t& operator=(const parser_t&);
process_t *create_job_process(job_t *job, const parse_node_t &statement_node, const parser_context_t &ctx);
process_t *create_boolean_process(job_t *job, const parse_node_t &bool_statement, const parser_context_t &ctx);
process_t *create_for_process(job_t *job, const parse_node_t &header, const parse_node_t &statement, const parser_context_t &ctx);
process_t *create_while_process(job_t *job, const parse_node_t &header, const parse_node_t &statement, const parser_context_t &ctx);
process_t *create_begin_process(job_t *job, const parse_node_t &header, const parse_node_t &statement, const parser_context_t &ctx);
process_t *create_plain_process(job_t *job, const parse_node_t &statement, const parser_context_t &ctx);
wcstring_list_t determine_arguments(const parse_node_t &statement, const parse_node_t **out_unmatched_wildcard_node, const parser_context_t &ctx);
io_chain_t determine_io_chain(const parse_node_t &statement,const parser_context_t &ctx);
void parse_job_argument_list(process_t *p, job_t *j, tokenizer_t *tok, std::vector<completion_t>&, bool);
int parse_job(process_t *p, job_t *j, tokenizer_t *tok);
void skipped_exec(job_t * j);
void eval_job(tokenizer_t *tok);
void eval_job(const parse_node_t &job_node, const parser_context_t &ctx);
int parser_test_argument(const wchar_t *arg, wcstring *out, const wchar_t *prefix, int offset);
void print_errors(wcstring &target, const wchar_t *prefix);
void print_errors_stderr();
@ -388,11 +371,7 @@ public:
\return 0 on success, 1 otherwise
*/
int eval(const wcstring &cmdStr, const io_chain_t &io, enum block_type_t block_type);
int eval2(const wcstring &cmd_str, const io_chain_t &io, enum block_type_t block_type);
void execute_job_list(node_offset_t idx, const parser_context_t &ctx);
void execute_next(std::vector<node_offset_t> *execution_stack, const parser_context_t &ctx);
/**
Evaluate line as a list of parameters, i.e. tokenize it and perform parameter expansion and cmdsubst execution on the tokens.
The output is inserted into output.