diff options
Diffstat (limited to 'libbuild2/test/script/parser.cxx')
| -rw-r--r-- | libbuild2/test/script/parser.cxx | 2071 |
1 files changed, 114 insertions, 1957 deletions
diff --git a/libbuild2/test/script/parser.cxx b/libbuild2/test/script/parser.cxx index 06cefc7..f663c11 100644 --- a/libbuild2/test/script/parser.cxx +++ b/libbuild2/test/script/parser.cxx @@ -3,8 +3,6 @@ #include <libbuild2/test/script/parser.hxx> -#include <sstream> - #include <libbuild2/context.hxx> // sched, keep_going #include <libbuild2/test/script/lexer.hxx> @@ -316,7 +314,7 @@ namespace build2 // Determine the line type/start token. // line_type lt; - type st (type::eos); + type st (type::eos); // Later, can only be set to plus or minus. switch (tt) { @@ -372,51 +370,7 @@ namespace build2 } default: { - // Either variable assignment or test command. - // - replay_save (); // Start saving tokens from the current one. - next (t, tt); - - // Decide whether this is a variable assignment or a command. - // - // It is an assignment if the first token is an unquoted name and - // the next token is an assign/append/prepend operator. Assignment - // to a computed variable name must use the set builtin. - // - // Note also thatspecial commands take precedence over variable - // assignments. - // - lt = line_type::cmd; // Default. - - if (tt == type::word && t.qtype == quote_type::unquoted) - { - const string& n (t.value); - - if (n == "if") lt = line_type::cmd_if; - else if (n == "if!") lt = line_type::cmd_ifn; - else if (n == "elif") lt = line_type::cmd_elif; - else if (n == "elif!") lt = line_type::cmd_elifn; - else if (n == "else") lt = line_type::cmd_else; - else if (n == "end") lt = line_type::cmd_end; - else - { - // Switch the recognition of leading variable assignments for - // the next token. This is safe to do because we know we - // cannot be in the quoted mode (since the current token is - // not quoted). - // - type p (peek (lexer_mode::second_token)); - - if (p == type::assign || - p == type::prepend || - p == type::append) - { - lt = line_type::var; - st = p; - } - } - } - + lt = pre_parse_line_start (t, tt, lexer_mode::second_token); break; } } @@ -435,7 +389,7 @@ namespace build2 // string& n (t.value); - if (n == "*" || n == "~" || n == "@" || digit (n)) + if (special_variable (n)) fail (t) << "attempt to set '" << n << "' variable directly"; // Pre-enter the variables now while we are executing serially. @@ -444,6 +398,11 @@ namespace build2 ln.var = &script_->var_pool.insert (move (n)); next (t, tt); // Assignment kind. + + // We cannot reuse the value mode since it will recognize `{` + // which we want to treat as a literal. + // + mode (lexer_mode::variable_line); parse_variable_line (t, tt); semi = (tt == type::semi); @@ -469,7 +428,7 @@ namespace build2 pair<command_expr, here_docs> p; if (lt != line_type::cmd_else && lt != line_type::cmd_end) - p = parse_command_expr (t, tt); + p = parse_command_expr (t, tt, lexer::redirect_aliases); // Colon and semicolon are only valid in test command lines and // after 'end' in if-else. Note that we still recognize them @@ -1039,7 +998,7 @@ namespace build2 const path_name* op (path_); path_ = &pn; - lexer* ol (lexer_); + build2::script::lexer* ol (lexer_); set_lexer (&l); string oip (id_prefix_); @@ -1281,35 +1240,6 @@ namespace build2 return r; } - value parser:: - parse_variable_line (token& t, type& tt) - { - // enter: assignment - // leave: newline or semi - - // We cannot reuse the value mode since it will recognize `{` which we - // want to treat as a literal. - // - mode (lexer_mode::variable_line); - next_with_attributes (t, tt); - - // Parse value attributes if any. Note that it's ok not to have - // anything after the attributes (e.g., foo=[null]). - // - attributes_push (t, tt, true); - - // @@ PAT: Should we expand patterns? Note that it will only be - // simple ones since we have disabled {}. Also, what would be the - // pattern base directory? - // - return tt != type::newline && tt != type::semi - ? parse_value (t, tt, - pattern_mode::ignore, - "variable value", - nullptr) - : value (names ()); - } - command_expr parser:: parse_command_line (token& t, type& tt) { @@ -1318,7 +1248,8 @@ namespace build2 // Note: this one is only used during execution. - pair<command_expr, here_docs> p (parse_command_expr (t, tt)); + pair<command_expr, here_docs> p ( + parse_command_expr (t, tt, lexer::redirect_aliases)); switch (tt) { @@ -1334,1542 +1265,6 @@ namespace build2 return move (p.first); } - // Parse the regular expression representation (non-empty string value - // framed with introducer characters and optionally followed by flag - // characters from the {di} set, for example '/foo/id') into - // components. Also return end-of-parsing position if requested, - // otherwise treat any unparsed characters left as an error. - // - struct regex_parts - { - string value; - char intro; - string flags; // Combination of characters from {di} set. - - // Create a special empty object. - // - regex_parts (): intro ('\0') {} - - regex_parts (string v, char i, string f) - : value (move (v)), intro (i), flags (move (f)) {} - }; - - static regex_parts - parse_regex (const string& s, - const location& l, - const char* what, - size_t* end = nullptr) - { - if (s.empty ()) - fail (l) << "no introducer character in " << what; - - size_t p (s.find (s[0], 1)); // Find terminating introducer. - - if (p == string::npos) - fail (l) << "no closing introducer character in " << what; - - size_t rn (p - 1); // Regex length. - if (rn == 0) - fail (l) << what << " is empty"; - - // Find end-of-flags position. - // - size_t fp (++p); // Save flags starting position. - for (char c; (c = s[p]) == 'd' || c == 'i'; ++p) ; - - // If string end is not reached then report invalid flags, unless - // end-of-parsing position is requested (which means regex is just a - // prefix). - // - if (s[p] != '\0' && end == nullptr) - fail (l) << "junk at the end of " << what; - - if (end != nullptr) - *end = p; - - return regex_parts (string (s, 1, rn), s[0], string (s, fp, p - fp)); - } - - pair<command_expr, parser::here_docs> parser:: - parse_command_expr (token& t, type& tt) - { - // enter: first token of the command line - // leave: <newline> - - command_expr expr; - - // OR-ed to an implied false for the first term. - // - expr.push_back ({expr_operator::log_or, command_pipe ()}); - - command c; // Command being assembled. - - // Make sure the command makes sense. - // - auto check_command = [&c, this] (const location& l, bool last) - { - if (c.out.type == redirect_type::merge && - c.err.type == redirect_type::merge) - fail (l) << "stdout and stderr redirected to each other"; - - if (!last && c.out.type != redirect_type::none) - fail (l) << "stdout is both redirected and piped"; - }; - - // Check that the introducer character differs from '/' if the - // portable path modifier is specified. Must be called before - // parse_regex() (see below) to make sure its diagnostics is - // meaningful. - // - // Note that the portable path modifier assumes '/' to be a valid - // regex character and so makes it indistinguishable from the - // terminating introducer. - // - auto check_regex_mod = [this] (const string& mod, - const string& re, - const location& l, - const char* what) - { - // Handles empty regex properly. - // - if (mod.find ('/') != string::npos && re[0] == '/') - fail (l) << "portable path modifier and '/' introducer in " - << what; - }; - - // Pending positions where the next word should go. - // - enum class pending - { - none, - program, - in_string, - in_document, - in_file, - out_merge, - out_string, - out_str_regex, - out_document, - out_doc_regex, - out_file, - err_merge, - err_string, - err_str_regex, - err_document, - err_doc_regex, - err_file, - clean - }; - pending p (pending::program); - string mod; // Modifiers for pending in_* and out_* positions. - here_docs hd; // Expected here-documents. - - // Add the next word to either one of the pending positions or to - // program arguments by default. - // - auto add_word = [&c, &p, &mod, &check_regex_mod, this] ( - string&& w, const location& l) - { - auto add_merge = [&l, this] (redirect& r, const string& w, int fd) - { - try - { - size_t n; - if (stoi (w, &n) == fd && n == w.size ()) - { - r.fd = fd; - return; - } - } - catch (const exception&) {} // Fall through. - - fail (l) << (fd == 1 ? "stderr" : "stdout") << " merge redirect " - << "file descriptor must be " << fd; - }; - - auto add_here_str = [] (redirect& r, string&& w) - { - if (r.modifiers.find (':') == string::npos) - w += '\n'; - r.str = move (w); - }; - - auto add_here_str_regex = [&l, &check_regex_mod] ( - redirect& r, int fd, string&& w) - { - const char* what (nullptr); - switch (fd) - { - case 1: what = "stdout regex redirect"; break; - case 2: what = "stderr regex redirect"; break; - } - - check_regex_mod (r.modifiers, w, l, what); - - regex_parts rp (parse_regex (w, l, what)); - - regex_lines& re (r.regex); - re.intro = rp.intro; - - re.lines.emplace_back ( - l.line, l.column, move (rp.value), move (rp.flags)); - - // Add final blank line unless suppressed. - // - // Note that the position is synthetic, but that's ok as we don't - // expect any diagnostics to refer this line. - // - if (r.modifiers.find (':') == string::npos) - re.lines.emplace_back (l.line, l.column, string (), false); - }; - - auto parse_path = [&l, this] (string&& w, const char* what) -> path - { - try - { - path p (move (w)); - - if (!p.empty ()) - { - p.normalize (); - return p; - } - - fail (l) << "empty " << what << endf; - } - catch (const invalid_path& e) - { - fail (l) << "invalid " << what << " '" << e.path << "'" << endf; - } - }; - - auto add_file = [&parse_path] (redirect& r, int fd, string&& w) - { - const char* what (nullptr); - switch (fd) - { - case 0: what = "stdin redirect path"; break; - case 1: what = "stdout redirect path"; break; - case 2: what = "stderr redirect path"; break; - } - - r.file.path = parse_path (move (w), what); - }; - - switch (p) - { - case pending::none: c.arguments.push_back (move (w)); break; - case pending::program: - c.program = parse_path (move (w), "program path"); - break; - - case pending::out_merge: add_merge (c.out, w, 2); break; - case pending::err_merge: add_merge (c.err, w, 1); break; - - case pending::in_string: add_here_str (c.in, move (w)); break; - case pending::out_string: add_here_str (c.out, move (w)); break; - case pending::err_string: add_here_str (c.err, move (w)); break; - - case pending::out_str_regex: - { - add_here_str_regex (c.out, 1, move (w)); - break; - } - case pending::err_str_regex: - { - add_here_str_regex (c.err, 2, move (w)); - break; - } - - // These are handled specially below. - // - case pending::in_document: - case pending::out_document: - case pending::err_document: - case pending::out_doc_regex: - case pending::err_doc_regex: assert (false); break; - - case pending::in_file: add_file (c.in, 0, move (w)); break; - case pending::out_file: add_file (c.out, 1, move (w)); break; - case pending::err_file: add_file (c.err, 2, move (w)); break; - - case pending::clean: - { - cleanup_type t; - switch (mod[0]) // Ok, if empty - { - case '!': t = cleanup_type::never; break; - case '?': t = cleanup_type::maybe; break; - default: t = cleanup_type::always; break; - } - - c.cleanups.push_back ( - {t, parse_path (move (w), "cleanup path")}); - break; - } - } - - p = pending::none; - mod.clear (); - }; - - // Make sure we don't have any pending positions to fill. - // - auto check_pending = [&p, this] (const location& l) - { - const char* what (nullptr); - - switch (p) - { - case pending::none: break; - case pending::program: what = "program"; break; - case pending::in_string: what = "stdin here-string"; break; - case pending::in_document: what = "stdin here-document end"; break; - case pending::in_file: what = "stdin file"; break; - case pending::out_merge: what = "stdout file descriptor"; break; - case pending::out_string: what = "stdout here-string"; break; - case pending::out_document: what = "stdout here-document end"; break; - case pending::out_file: what = "stdout file"; break; - case pending::err_merge: what = "stderr file descriptor"; break; - case pending::err_string: what = "stderr here-string"; break; - case pending::err_document: what = "stderr here-document end"; break; - case pending::err_file: what = "stderr file"; break; - case pending::clean: what = "cleanup path"; break; - - case pending::out_str_regex: - { - what = "stdout here-string regex"; - break; - } - case pending::err_str_regex: - { - what = "stderr here-string regex"; - break; - } - case pending::out_doc_regex: - { - what = "stdout here-document regex end"; - break; - } - case pending::err_doc_regex: - { - what = "stderr here-document regex end"; - break; - } - } - - if (what != nullptr) - fail (l) << "missing " << what; - }; - - // Parse the redirect operator. - // - auto parse_redirect = - [&c, &expr, &p, &mod, &hd, this] (token& t, const location& l) - { - // Our semantics is the last redirect seen takes effect. - // - assert (p == pending::none && mod.empty ()); - - // See if we have the file descriptor. - // - unsigned long fd (3); - if (!t.separated) - { - if (c.arguments.empty ()) - fail (l) << "missing redirect file descriptor"; - - const string& s (c.arguments.back ()); - - try - { - size_t n; - fd = stoul (s, &n); - - if (n != s.size () || fd > 2) - throw invalid_argument (string ()); - } - catch (const exception&) - { - fail (l) << "invalid redirect file descriptor '" << s << "'"; - } - - c.arguments.pop_back (); - } - - type tt (t.type); - - // Validate/set default file descriptor. - // - switch (tt) - { - case type::in_pass: - case type::in_null: - case type::in_str: - case type::in_doc: - case type::in_file: - { - if ((fd = fd == 3 ? 0 : fd) != 0) - fail (l) << "invalid in redirect file descriptor " << fd; - - if (!expr.back ().pipe.empty ()) - fail (l) << "stdin is both piped and redirected"; - - break; - } - case type::out_pass: - case type::out_null: - case type::out_trace: - case type::out_merge: - case type::out_str: - case type::out_doc: - case type::out_file_cmp: - case type::out_file_ovr: - case type::out_file_app: - { - if ((fd = fd == 3 ? 1 : fd) == 0) - fail (l) << "invalid out redirect file descriptor " << fd; - - break; - } - } - - mod = move (t.value); - - redirect_type rt (redirect_type::none); - switch (tt) - { - case type::in_pass: - case type::out_pass: rt = redirect_type::pass; break; - - case type::in_null: - case type::out_null: rt = redirect_type::null; break; - - case type::out_trace: rt = redirect_type::trace; break; - - case type::out_merge: rt = redirect_type::merge; break; - - case type::in_str: - case type::out_str: - { - bool re (mod.find ('~') != string::npos); - assert (tt == type::out_str || !re); - - rt = re - ? redirect_type::here_str_regex - : redirect_type::here_str_literal; - - break; - } - - case type::in_doc: - case type::out_doc: - { - bool re (mod.find ('~') != string::npos); - assert (tt == type::out_doc || !re); - - rt = re - ? redirect_type::here_doc_regex - : redirect_type::here_doc_literal; - - break; - } - - case type::in_file: - case type::out_file_cmp: - case type::out_file_ovr: - case type::out_file_app: rt = redirect_type::file; break; - } - - redirect& r (fd == 0 ? c.in : fd == 1 ? c.out : c.err); - redirect_type overriden (r.type); - - r = redirect (rt); - - // Don't move as still may be used for pending here-document end - // marker processing. - // - r.modifiers = mod; - - switch (rt) - { - case redirect_type::none: - case redirect_type::pass: - case redirect_type::null: - case redirect_type::trace: - break; - case redirect_type::merge: - switch (fd) - { - case 0: assert (false); break; - case 1: p = pending::out_merge; break; - case 2: p = pending::err_merge; break; - } - break; - case redirect_type::here_str_literal: - switch (fd) - { - case 0: p = pending::in_string; break; - case 1: p = pending::out_string; break; - case 2: p = pending::err_string; break; - } - break; - case redirect_type::here_str_regex: - switch (fd) - { - case 0: assert (false); break; - case 1: p = pending::out_str_regex; break; - case 2: p = pending::err_str_regex; break; - } - break; - case redirect_type::here_doc_literal: - switch (fd) - { - case 0: p = pending::in_document; break; - case 1: p = pending::out_document; break; - case 2: p = pending::err_document; break; - } - break; - case redirect_type::here_doc_regex: - switch (fd) - { - case 0: assert (false); break; - case 1: p = pending::out_doc_regex; break; - case 2: p = pending::err_doc_regex; break; - } - break; - case redirect_type::file: - switch (fd) - { - case 0: p = pending::in_file; break; - case 1: p = pending::out_file; break; - case 2: p = pending::err_file; break; - } - - // Also sets for stdin, but this is harmless. - // - r.file.mode = tt == type::out_file_ovr - ? redirect_fmode::overwrite - : (tt == type::out_file_app - ? redirect_fmode::append - : redirect_fmode::compare); - - break; - - case redirect_type::here_doc_ref: assert (false); break; - } - - // If we are overriding a here-document, then remove the reference - // to this command redirect from the corresponding here_doc object. - // - if (!pre_parse_ && - (overriden == redirect_type::here_doc_literal || - overriden == redirect_type::here_doc_regex)) - { - size_t e (expr.size () - 1); - size_t p (expr.back ().pipe.size ()); - int f (static_cast<int> (fd)); - - for (here_doc& d: hd) - { - small_vector<here_redirect, 2>& rs (d.redirects); - - auto i (find_if (rs.begin (), rs.end (), - [e, p, f] (const here_redirect& r) - { - return r.expr == e && - r.pipe == p && - r.fd == f; - })); - - if (i != rs.end ()) - { - rs.erase (i); - break; - } - } - } - }; - - // Set pending cleanup type. - // - auto parse_clean = [&p, &mod] (token& t) - { - p = pending::clean; - mod = move (t.value); - }; - - const location ll (get_location (t)); // Line location. - - // Keep parsing chunks of the command line until we see one of the - // "terminators" (newline, semicolon, exit status comparison, etc). - // - location l (ll); - names ns; // Reuse to reduce allocations. - - for (bool done (false); !done; l = get_location (t)) - { - switch (tt) - { - case type::semi: - case type::colon: - case type::newline: - { - done = true; - break; - } - - case type::equal: - case type::not_equal: - { - if (!pre_parse_) - check_pending (l); - - c.exit = parse_command_exit (t, tt); - - // Only a limited set of things can appear after the exit status - // so we check this here. - // - switch (tt) - { - case type::semi: - case type::colon: - case type::newline: - - case type::pipe: - case type::log_or: - case type::log_and: - break; - default: - fail (t) << "unexpected " << t << " after command exit status"; - } - - break; - } - - case type::pipe: - case type::log_or: - case type::log_and: - - case type::in_pass: - case type::out_pass: - - case type::in_null: - case type::out_null: - - case type::out_trace: - - case type::out_merge: - - case type::in_str: - case type::in_doc: - case type::out_str: - case type::out_doc: - - case type::in_file: - case type::out_file_cmp: - case type::out_file_ovr: - case type::out_file_app: - - case type::clean: - { - if (pre_parse_) - { - // The only things we need to handle here are the here-document - // and here-document regex end markers since we need to know - // how many of them to pre-parse after the command. - // - switch (tt) - { - case type::in_doc: - case type::out_doc: - mod = move (t.value); - - bool re (mod.find ('~') != string::npos); - const char* what (re - ? "here-document regex end marker" - : "here-document end marker"); - - // We require the end marker to be a literal, unquoted word. - // In particularm, we don't allow quoted because of cases - // like foo"$bar" (where we will see word 'foo'). - // - next (t, tt); - - // We require the end marker to be an unquoted or completely - // quoted word. The complete quoting becomes important for - // cases like foo"$bar" (where we will see word 'foo'). - // - // For good measure we could have also required it to be - // separated from the following token, but out grammar - // allows one to write >>EOO;. The problematic sequence - // would be >>FOO$bar -- on reparse it will be expanded - // as a single word. - // - if (tt != type::word || t.value.empty ()) - fail (t) << "expected " << what; - - peek (); - const token& p (peeked ()); - if (!p.separated) - { - switch (p.type) - { - case type::dollar: - case type::lparen: - fail (p) << what << " must be literal"; - } - } - - quote_type qt (t.qtype); - switch (qt) - { - case quote_type::unquoted: - qt = quote_type::single; // Treat as single-quoted. - break; - case quote_type::single: - case quote_type::double_: - if (t.qcomp) - break; - // Fall through. - case quote_type::mixed: - fail (t) << "partially-quoted " << what; - } - - regex_parts r; - string end (move (t.value)); - - if (re) - { - check_regex_mod (mod, end, l, what); - - r = parse_regex (end, l, what); - end = move (r.value); // The "cleared" end marker. - } - - bool literal (qt == quote_type::single); - bool shared (false); - - for (const auto& d: hd) - { - if (d.end == end) - { - auto check = [&t, &end, &re, this] (bool c, - const char* what) - { - if (!c) - fail (t) << "different " << what - << " for shared here-document " - << (re ? "regex '" : "'") << end << "'"; - }; - - check (d.modifiers == mod, "modifiers"); - check (d.literal == literal, "quoting"); - - if (re) - { - check (d.regex == r.intro, "introducers"); - check (d.regex_flags == r.flags, "global flags"); - } - - shared = true; - break; - } - } - - if (!shared) - hd.push_back ( - here_doc { - {}, - move (end), - literal, - move (mod), - r.intro, move (r.flags)}); - - break; - } - - next (t, tt); - break; - } - - // If this is one of the operators/separators, check that we - // don't have any pending locations to be filled. - // - check_pending (l); - - // Note: there is another one in the inner loop below. - // - switch (tt) - { - case type::pipe: - case type::log_or: - case type::log_and: - { - // Check that the previous command makes sense. - // - check_command (l, tt != type::pipe); - expr.back ().pipe.push_back (move (c)); - - c = command (); - p = pending::program; - - if (tt != type::pipe) - { - expr_operator o (tt == type::log_or - ? expr_operator::log_or - : expr_operator::log_and); - expr.push_back ({o, command_pipe ()}); - } - - break; - } - - case type::in_pass: - case type::out_pass: - - case type::in_null: - case type::out_null: - - case type::out_trace: - - case type::out_merge: - - case type::in_str: - case type::in_doc: - case type::out_str: - case type::out_doc: - - case type::in_file: - case type::out_file_cmp: - case type::out_file_ovr: - case type::out_file_app: - { - parse_redirect (t, l); - break; - } - - case type::clean: - { - parse_clean (t); - break; - } - - default: assert (false); break; - } - - next (t, tt); - break; - } - default: - { - // Here-document end markers are literal (we verified that above - // during pre-parsing) and we need to know whether they were - // quoted. So handle this case specially. - // - { - int fd; - switch (p) - { - case pending::in_document: fd = 0; break; - case pending::out_document: - case pending::out_doc_regex: fd = 1; break; - case pending::err_document: - case pending::err_doc_regex: fd = 2; break; - default: fd = -1; break; - } - - if (fd != -1) - { - here_redirect rd { - expr.size () - 1, expr.back ().pipe.size (), fd}; - - string end (move (t.value)); - - regex_parts r; - - if (p == pending::out_doc_regex || - p == pending::err_doc_regex) - { - // We can't fail here as we already parsed all the end - // markers during pre-parsing stage, and so no need in the - // description. - // - r = parse_regex (end, l, ""); - end = move (r.value); // The "cleared" end marker. - } - - bool shared (false); - for (auto& d: hd) - { - // No need to check that redirects that share here-document - // have the same modifiers, etc. That have been done during - // pre-parsing. - // - if (d.end == end) - { - d.redirects.emplace_back (rd); - shared = true; - break; - } - } - - if (!shared) - hd.push_back ( - here_doc { - {rd}, - move (end), - (t.qtype == quote_type::unquoted || - t.qtype == quote_type::single), - move (mod), - r.intro, move (r.flags)}); - - p = pending::none; - mod.clear (); - - next (t, tt); - break; - } - } - - // Parse the next chunk as simple names to get expansion, etc. - // Note that we do it in the chunking mode to detect whether - // anything in each chunk is quoted. - // - // @@ PAT: should we support pattern expansion? This is even - // fuzzier than the variable case above. Though this is the - // shell semantics. Think what happens when we do rm *.txt? - // - reset_quoted (t); - parse_names (t, tt, - ns, - pattern_mode::ignore, - true, - "command line", - nullptr); - - if (pre_parse_) // Nothing else to do if we are pre-parsing. - break; - - // Process what we got. Determine whether anything inside was - // quoted (note that the current token is "next" and is not part - // of this). - // - bool q ((quoted () - - (t.qtype != quote_type::unquoted ? 1 : 0)) != 0); - - for (name& n: ns) - { - string s; - - try - { - s = value_traits<string>::convert (move (n), nullptr); - } - catch (const invalid_argument&) - { - diag_record dr (fail (l)); - dr << "invalid string value "; - to_stream (dr.os, n, true); // Quote. - } - - // If it is a quoted chunk, then we add the word as is. - // Otherwise we re-lex it. But if the word doesn't contain any - // interesting characters (operators plus quotes/escapes), - // then no need to re-lex. - // - // NOTE: update quoting (script.cxx:to_stream_q()) if adding - // any new characters. - // - if (q || s.find_first_of ("|&<>\'\"\\") == string::npos) - add_word (move (s), l); - else - { - // If the chunk re-parsing results in error, our diagnostics - // will look like this: - // - // <string>:1:4: error: stdout merge redirect file descriptor must be 2 - // testscript:2:5: info: while parsing string '1>&a' - // - auto df = make_diag_frame ( - [s, &l](const diag_record& dr) - { - dr << info (l) << "while parsing string '" << s << "'"; - }); - - // When re-lexing we do "effective escaping" and only for - // ['"\] (quotes plus the backslash itself). In particular, - // there is no way to escape redirects, operators, etc. The - // idea is to prefer quoting except for passing literal - // quotes, for example: - // - // args = \"&foo\" - // cmd $args # cmd &foo - // - // args = 'x=\"foo bar\"' - // cmd $args # cmd x="foo bar" - // - - istringstream is (s); - path_name in ("<string>"); - lexer lex (is, in, - lexer_mode::command_expansion, - "\'\"\\"); - - // Treat the first "sub-token" as always separated from what - // we saw earlier. - // - // Note that this is not "our" token so we cannot do - // fail(t). Rather we should do fail(l). - // - token t (lex.next ()); - location l (build2::get_location (t, in)); - t.separated = true; - - string w; - bool f (t.type == type::eos); // If the whole thing is empty. - - for (; t.type != type::eos; t = lex.next ()) - { - type tt (t.type); - l = build2::get_location (t, in); - - // Re-lexing double-quotes will recognize $, ( inside as - // tokens so we have to reverse them back. Since we don't - // treat spaces as separators we can be sure we will get - // it right. - // - switch (tt) - { - case type::dollar: w += '$'; continue; - case type::lparen: w += '('; continue; - } - - // Retire the current word. We need to distinguish between - // empty and non-existent (e.g., > vs >""). - // - if (!w.empty () || f) - { - add_word (move (w), l); - f = false; - } - - if (tt == type::word) - { - w = move (t.value); - f = true; - continue; - } - - // If this is one of the operators/separators, check that - // we don't have any pending locations to be filled. - // - check_pending (l); - - // Note: there is another one in the outer loop above. - // - switch (tt) - { - case type::pipe: - case type::log_or: - case type::log_and: - { - // Check that the previous command makes sense. - // - check_command (l, tt != type::pipe); - expr.back ().pipe.push_back (move (c)); - - c = command (); - p = pending::program; - - if (tt != type::pipe) - { - expr_operator o (tt == type::log_or - ? expr_operator::log_or - : expr_operator::log_and); - expr.push_back ({o, command_pipe ()}); - } - - break; - } - - case type::in_pass: - case type::out_pass: - - case type::in_null: - case type::out_null: - - case type::out_trace: - - case type::out_merge: - - case type::in_str: - case type::out_str: - - case type::in_file: - case type::out_file_cmp: - case type::out_file_ovr: - case type::out_file_app: - { - parse_redirect (t, l); - break; - } - - case type::clean: - { - parse_clean (t); - break; - } - - case type::in_doc: - case type::out_doc: - { - fail (l) << "here-document redirect in expansion"; - break; - } - } - } - - // Don't forget the last word. - // - if (!w.empty () || f) - add_word (move (w), l); - } - } - - ns.clear (); - break; - } - } - } - - if (!pre_parse_) - { - // Verify we don't have anything pending to be filled and the - // command makes sense. - // - check_pending (l); - check_command (l, true); - - expr.back ().pipe.push_back (move (c)); - } - - return make_pair (move (expr), move (hd)); - } - - command_exit parser:: - parse_command_exit (token& t, type& tt) - { - // enter: equal/not_equal - // leave: token after exit status (one parse_names() chunk) - - exit_comparison comp (tt == type::equal - ? exit_comparison::eq - : exit_comparison::ne); - - // The next chunk should be the exit status. - // - next (t, tt); - location l (get_location (t)); - names ns (parse_names (t, tt, - pattern_mode::ignore, - true, - "exit status", - nullptr)); - unsigned long es (256); - - if (!pre_parse_) - { - try - { - if (ns.size () == 1 && ns[0].simple () && !ns[0].empty ()) - es = stoul (ns[0].value); - } - catch (const exception&) {} // Fall through. - - if (es > 255) - { - diag_record dr; - - dr << fail (l) << "expected exit status instead of "; - to_stream (dr.os, ns, true); // Quote. - - dr << info << "exit status is an unsigned integer less than 256"; - } - } - - return command_exit {comp, static_cast<uint8_t> (es)}; - } - - void parser:: - parse_here_documents (token& t, type& tt, - pair<command_expr, here_docs>& p) - { - // enter: newline - // leave: newline - - // Parse here-document fragments in the order they were mentioned on - // the command line. - // - for (here_doc& h: p.second) - { - // Switch to the here-line mode which is like single/double-quoted - // string but recognized the newline as a separator. - // - mode (h.literal - ? lexer_mode::here_line_single - : lexer_mode::here_line_double); - next (t, tt); - - parsed_doc v ( - parse_here_document (t, tt, h.end, h.modifiers, h.regex)); - - // If all the here-document redirects are overridden, then we just - // drop the fragment. - // - if (!pre_parse_ && !h.redirects.empty ()) - { - auto i (h.redirects.cbegin ()); - - command& c (p.first[i->expr].pipe[i->pipe]); - redirect& r (i->fd == 0 ? c.in : i->fd == 1 ? c.out : c.err); - - if (v.re) - { - assert (r.type == redirect_type::here_doc_regex); - - r.regex = move (v.regex); - r.regex.flags = move (h.regex_flags); - } - else - { - assert (r.type == redirect_type::here_doc_literal); - - r.str = move (v.str); - } - - r.end = move (h.end); - r.end_line = v.end_line; - r.end_column = v.end_column; - - // Note that our references cannot be invalidated because the - // command_expr/command-pipe vectors already contain all their - // elements. - // - for (++i; i != h.redirects.cend (); ++i) - { - command& c (p.first[i->expr].pipe[i->pipe]); - - (i->fd == 0 ? c.in : i->fd == 1 ? c.out : c.err) = - redirect (redirect_type::here_doc_ref, r); - } - } - - expire_mode (); - } - } - - parser::parsed_doc parser:: - parse_here_document (token& t, type& tt, - const string& em, - const string& mod, - char re) - { - // enter: first token on first line - // leave: newline (after end marker) - - // String literal. Note that when decide if to terminate the previously - // added line with a newline, we need to distinguish a yet empty result - // and the one that has a single blank line added. - // - optional<string> rs; - - regex_lines rre; - - // Here-documents can be indented. The leading whitespaces of the end - // marker line (called strip prefix) determine the indentation. Every - // other line in the here-document should start with this prefix which - // is automatically stripped. The only exception is a blank line. - // - // The fact that the strip prefix is only known at the end, after - // seeing all the lines, is rather inconvenient. As a result, the way - // we implement this is a bit hackish (though there is also something - // elegant about it): at the end of the pre-parse stage we are going - // re-examine the sequence of tokens that comprise this here-document - // and "fix up" the first token of each line by stripping the prefix. - // - string sp; - - // Remember the position of the first token in this here-document. - // - size_t ri (pre_parse_ ? replay_data_.size () - 1 : 0); - - // We will use the location of the first token on the line for the - // regex diagnostics. At the end of the loop it will point to the - // beginning of the end marker. - // - location l; - - while (tt != type::eos) - { - l = get_location (t); - - // Check if this is the end marker. For starters, it should be a - // single, unquoted word followed by a newline. - // - if (tt == type::word && - t.qtype == quote_type::unquoted && - peek () == type::newline) - { - const string& v (t.value); - - size_t vn (v.size ()); - size_t en (em.size ()); - - // Then check that it ends with the end marker. - // - if (vn >= en && v.compare (vn - en, en, em) == 0) - { - // Now check that the prefix only contains whitespaces. - // - size_t n (vn - en); - - if (v.find_first_not_of (" \t") >= n) - { - assert (pre_parse_ || n == 0); // Should have been stripped. - - if (n != 0) - sp.assign (v, 0, n); // Save the strip prefix. - - next (t, tt); // Get the newline. - break; - } - } - } - - // Expand the line (can be blank). - // - // @@ PAT: one could argue that if we do it in variables, then we - // should do it here as well. Though feels bizarre. - // - names ns (tt != type::newline - ? parse_names (t, tt, - pattern_mode::ignore, - false, - "here-document line", - nullptr) - : names ()); - - if (!pre_parse_) - { - // What shall we do if the expansion results in multiple names? - // For, example if the line contains just the variable expansion - // and it is of type strings. Adding all the elements space- - // separated seems like the natural thing to do. - // - string s; - for (auto b (ns.begin ()), i (b); i != ns.end (); ++i) - { - string n; - - try - { - n = value_traits<string>::convert (move (*i), nullptr); - } - catch (const invalid_argument&) - { - fail (l) << "invalid string value '" << *i << "'"; - } - - if (i == b) - s = move (n); - else - { - s += ' '; - s += n; - } - } - - if (!re) - { - // Add newline after previous line. - // - if (rs) - { - *rs += '\n'; - *rs += s; - } - else - rs = move (s); - } - else - { - // Due to expansion we can end up with multiple lines. If empty - // then will add a blank textual literal. - // - for (size_t p (0); p != string::npos; ) - { - string ln; - size_t np (s.find ('\n', p)); - - if (np != string::npos) - { - ln = string (s, p, np - p); - p = np + 1; - } - else - { - ln = string (s, p); - p = np; - } - - if (ln[0] != re) // Line doesn't start with regex introducer. - { - // This is a line-char literal (covers blank lines as well). - // - // Append textual literal. - // - rre.lines.emplace_back (l.line, l.column, move (ln), false); - } - else // Line starts with the regex introducer. - { - // This is a char-regex, or a sequence of line-regex syntax - // characters or both (in this specific order). So we will - // add regex (with optional special characters) or special - // literal. - // - size_t p (ln.find (re, 1)); - if (p == string::npos) - { - // No regex, just a sequence of syntax characters. - // - string spec (ln, 1); - if (spec.empty ()) - fail (l) << "no syntax line characters"; - - // Append special literal. - // - rre.lines.emplace_back ( - l.line, l.column, move (spec), true); - } - else - { - // Regex (probably with syntax characters). - // - regex_parts re; - - // Empty regex is a special case repesenting a blank line. - // - if (p == 1) - // Position to optional specal characters of an empty - // regex. - // - ++p; - else - // Can't fail as all the pre-conditions verified - // (non-empty with both introducers in place), so no - // description required. - // - re = parse_regex (ln, l, "", &p); - - // Append regex with optional special characters. - // - rre.lines.emplace_back (l.line, l.column, - move (re.value), move (re.flags), - string (ln, p)); - } - } - } - } - } - - // We should expand the whole line at once so this would normally be - // a newline but can also be an end-of-stream. - // - if (tt == type::newline) - next (t, tt); - else - assert (tt == type::eos); - } - - if (tt == type::eos) - fail (t) << "missing here-document end marker '" << em << "'"; - - if (pre_parse_) - { - // Strip the indentation prefix if there is one. - // - assert (replay_ == replay::save); - - if (!sp.empty ()) - { - size_t sn (sp.size ()); - - for (; ri != replay_data_.size (); ++ri) - { - token& rt (replay_data_[ri].token); - - if (rt.type == type::newline) // Blank - continue; - - if (rt.type != type::word || rt.value.compare (0, sn, sp) != 0) - fail (rt) << "unindented here-document line"; - - // If the word is equal to the strip prefix then we have to drop - // the token. Note that simply making it an empty word won't - // have the same semantics. For instance, it would trigger - // concatenated expansion. - // - if (rt.value.size () == sn) - replay_data_.erase (replay_data_.begin () + ri); - else - { - rt.value.erase (0, sn); - rt.column += sn; - ++ri; - } - - // Skip until next newline. - // - for (; replay_data_[ri].token.type != type::newline; ++ri) ; - } - } - } - else - { - // Add final newline unless suppressed. - // - if (mod.find (':') == string::npos) - { - if (re) - // Note that the position is synthetic, but that's ok as we don't - // expect any diagnostics to refer this line. - // - rre.lines.emplace_back (l.line, l.column, string (), false); - else if (rs) - *rs += '\n'; - else - rs = "\n"; - } - - // Finalize regex lines. - // - if (re) - { - // Empty regex matches nothing, so not of much use. - // - if (rre.lines.empty ()) - fail (l) << "empty here-document regex"; - - rre.intro = re; - } - } - - return re - ? parsed_doc (move (rre), l.line, l.column) - : parsed_doc (rs ? move (*rs) : string (), l.line, l.column); - } - // // Execute. // @@ -2927,20 +1322,99 @@ namespace build2 void parser:: exec_scope_body () { - size_t li (0); - runner_->enter (*scope_, scope_->start_loc_); + // Note that we rely on "small function object" optimization for the + // exec_*() lambdas. + // + auto exec_set = [this] (const variable& var, + token& t, build2::script::token_type& tt, + const location&) + { + next (t, tt); + type kind (tt); // Assignment kind. + + // We cannot reuse the value mode (see above for details). + // + mode (lexer_mode::variable_line); + value rhs (parse_variable_line (t, tt)); + + if (tt == type::semi) + next (t, tt); + + assert (tt == type::newline); + + // Assign. + // + value& lhs (kind == type::assign + ? scope_->assign (var) + : scope_->append (var)); + + apply_value_attributes (&var, lhs, move (rhs), kind); + + // If we change any of the test.* values, then reset the $*, $N + // special aliases. + // + if (var.name == script_->test_var.name || + var.name == script_->options_var.name || + var.name == script_->arguments_var.name || + var.name == script_->redirects_var.name || + var.name == script_->cleanups_var.name) + { + scope_->reset_special (); + } + }; + + // Is set later, right before the exec_lines() call. + // + command_type ct; + + auto exec_cmd = [&ct, this] (token& t, build2::script::token_type& tt, + size_t li, + bool single, + const location& ll) + { + // We use the 0 index to signal that this is the only command. + // Note that we only do this for test commands. + // + if (ct == command_type::test && single) + li = 0; + + command_expr ce ( + parse_command_line (t, static_cast<token_type&> (tt))); + + runner_->run (*scope_, ce, ct, li, ll); + }; + + auto exec_if = [this] (token& t, build2::script::token_type& tt, + size_t li, + const location& ll) + { + command_expr ce ( + parse_command_line (t, static_cast<token_type&> (tt))); + + // Assume if-else always involves multiple commands. + // + return runner_->run_if (*scope_, ce, li, ll); + }; + + size_t li (1); + if (test* t = dynamic_cast<test*> (scope_)) { - exec_lines ( - t->tests_.begin (), t->tests_.end (), li, command_type::test); + ct = command_type::test; + + exec_lines (t->tests_.begin (), t->tests_.end (), + exec_set, exec_cmd, exec_if, + li); } else if (group* g = dynamic_cast<group*> (scope_)) { - bool exec_scope ( - exec_lines ( - g->setup_.begin (), g->setup_.end (), li, command_type::setup)); + ct = command_type::setup; + + bool exec_scope (exec_lines (g->setup_.begin (), g->setup_.end (), + exec_set, exec_cmd, exec_if, + li)); if (exec_scope) { @@ -2998,7 +1472,7 @@ namespace build2 try { - take = runner_->run_if (*scope_, ce, ++li, ll); + take = runner_->run_if (*scope_, ce, li++, ll); } catch (const exit_scope& e) { @@ -3106,8 +1580,11 @@ namespace build2 } } - exec_lines ( - g->tdown_.begin (), g->tdown_.end (), li, command_type::teardown); + ct = command_type::teardown; + + exec_lines (g->tdown_.begin (), g->tdown_.end (), + exec_set, exec_cmd, exec_if, + li); } else assert (false); @@ -3117,239 +1594,23 @@ namespace build2 scope_->state = scope_state::passed; } - bool parser:: - exec_lines (lines::iterator i, lines::iterator e, - size_t& li, - command_type ct) - { - try - { - token t; - type tt; - - for (; i != e; ++i) - { - line& ln (*i); - line_type lt (ln.type); - - assert (path_ == nullptr); - - // Set the tokens and start playing. - // - replay_data (move (ln.tokens)); - - // We don't really need to change the mode since we already know - // the line type. - // - next (t, tt); - const location ll (get_location (t)); - - switch (lt) - { - case line_type::var: - { - // Parse. - // - string name (move (t.value)); - - next (t, tt); - type kind (tt); // Assignment kind. - - value rhs (parse_variable_line (t, tt)); - - if (tt == type::semi) - next (t, tt); - - assert (tt == type::newline); - - // Assign. - // - const variable& var (*ln.var); - - value& lhs (kind == type::assign - ? scope_->assign (var) - : scope_->append (var)); - - build2::parser::apply_value_attributes ( - &var, lhs, move (rhs), kind); - - // If we changes any of the test.* values, then reset the $*, - // $N special aliases. - // - if (var.name == script_->test_var.name || - var.name == script_->options_var.name || - var.name == script_->arguments_var.name || - var.name == script_->redirects_var.name || - var.name == script_->cleanups_var.name) - { - scope_->reset_special (); - } - - replay_stop (); - break; - } - case line_type::cmd: - { - // We use the 0 index to signal that this is the only command. - // Note that we only do this for test commands. - // - if (ct == command_type::test && li == 0) - { - lines::iterator j (i); - for (++j; j != e && j->type == line_type::var; ++j) ; - - if (j != e) // We have another command. - ++li; - } - else - ++li; - - command_expr ce (parse_command_line (t, tt)); - runner_->run (*scope_, ce, ct, li, ll); - - replay_stop (); - break; - } - case line_type::cmd_if: - case line_type::cmd_ifn: - case line_type::cmd_elif: - case line_type::cmd_elifn: - case line_type::cmd_else: - { - next (t, tt); // Skip to start of command. - - bool take; - if (lt != line_type::cmd_else) - { - // Assume if-else always involves multiple commands. - // - command_expr ce (parse_command_line (t, tt)); - take = runner_->run_if (*scope_, ce, ++li, ll); - - if (lt == line_type::cmd_ifn || lt == line_type::cmd_elifn) - take = !take; - } - else - { - assert (tt == type::newline); - take = true; - } - - replay_stop (); - - // If end is true, then find the 'end' line. Otherwise, find - // the next if-else line. If skip is true then increment the - // command line index. - // - auto next = [e, &li] - (lines::iterator j, bool end, bool skip) -> lines::iterator - { - // We need to be aware of nested if-else chains. - // - size_t n (0); - - for (++j; j != e; ++j) - { - line_type lt (j->type); - - if (lt == line_type::cmd_if || - lt == line_type::cmd_ifn) - ++n; - - // If we are nested then we just wait until we get back - // to the surface. - // - if (n == 0) - { - switch (lt) - { - case line_type::cmd_elif: - case line_type::cmd_elifn: - case line_type::cmd_else: - if (end) break; - // Fall through. - case line_type::cmd_end: return j; - default: break; - } - } - - if (lt == line_type::cmd_end) - --n; - - if (skip) - { - // Note that we don't count else and end as commands. - // - switch (lt) - { - case line_type::cmd: - case line_type::cmd_if: - case line_type::cmd_ifn: - case line_type::cmd_elif: - case line_type::cmd_elifn: ++li; break; - default: break; - } - } - } - - assert (false); // Missing end. - return e; - }; - - // If we are taking this branch then we need to parse all the - // lines until the next if-else line and then skip all the - // lines until the end (unless next is already end). - // - // Otherwise, we need to skip all the lines until the next - // if-else line and then continue parsing. - // - if (take) - { - lines::iterator j (next (i, false, false)); // Next if-else. - if (!exec_lines (i + 1, j, li, ct)) - return false; - - i = j->type == line_type::cmd_end ? j : next (j, true, true); - } - else - { - i = next (i, false, true); - if (i->type != line_type::cmd_end) - --i; // Continue with this line (e.g., elif or else). - } - - break; - } - case line_type::cmd_end: - { - assert (false); - } - } - } - - return true; - } - catch (const exit_scope& e) - { - // Bail out if the scope is exited with the failure status. Otherwise - // leave the scope normally. - // - if (!e.status) - throw failed (); - - replay_stop (); - return false; - } - } - // // The rest. // + // When add a special variable don't forget to update lexer::word(). + // + bool parser:: + special_variable (const string& n) noexcept + { + return n == "*" || n == "~" || n == "@" || digit (n); + } + lookup parser:: lookup_variable (name&& qual, string&& name, const location& loc) { - assert (!pre_parse_); + if (pre_parse_) + return lookup (); if (!qual.empty ()) fail (loc) << "qualified variable name"; @@ -3381,40 +1642,6 @@ namespace build2 : script_->lookup_in_buildfile (name); } - size_t parser:: - quoted () const - { - size_t r (0); - - if (replay_ != replay::play) - r = lexer_->quoted (); - else - { - // Examine tokens we have replayed since last reset. - // - for (size_t i (replay_quoted_); i != replay_i_; ++i) - if (replay_data_[i].token.qtype != quote_type::unquoted) - ++r; - } - - return r; - } - - void parser:: - reset_quoted (token& cur) - { - if (replay_ != replay::play) - lexer_->reset_quoted (cur.qtype != quote_type::unquoted ? 1 : 0); - else - { - replay_quoted_ = replay_i_ - 1; - - // Must be the same token. - // - assert (replay_data_[replay_quoted_].token.qtype == cur.qtype); - } - } - const string& parser:: insert_id (string id, location l) { @@ -3426,76 +1653,6 @@ namespace build2 return p.first->first; } - - void parser:: - set_lexer (lexer* l) - { - lexer_ = l; - base_parser::lexer_ = l; - } - - void parser:: - apply_value_attributes (const variable* var, - value& lhs, - value&& rhs, - const string& attributes, - token_type kind, - const path_name& name) - { - path_ = &name; - - istringstream is (attributes); - lexer l (is, name, lexer_mode::attributes); - set_lexer (&l); - - token t; - type tt; - - next_with_attributes (t, tt); // Enable `[` recognition. - - if (tt != type::lsbrace && tt != type::eos) - fail (t) << "expected '[' instead of " << t; - - attributes_push (t, tt, true); - - if (tt != type::eos) - fail (t) << "trailing junk after ']'"; - - build2::parser::apply_value_attributes (var, lhs, move (rhs), kind); - } - - // parser::parsed_doc - // - parser::parsed_doc:: - parsed_doc (string s, uint64_t l, uint64_t c) - : str (move (s)), re (false), end_line (l), end_column (c) - { - } - - parser::parsed_doc:: - parsed_doc (regex_lines&& r, uint64_t l, uint64_t c) - : regex (move (r)), re (true), end_line (l), end_column (c) - { - } - - parser::parsed_doc:: - parsed_doc (parsed_doc&& d) - : re (d.re), end_line (d.end_line), end_column (d.end_column) - { - if (re) - new (®ex) regex_lines (move (d.regex)); - else - new (&str) string (move (d.str)); - } - - parser::parsed_doc:: - ~parsed_doc () - { - if (re) - regex.~regex_lines (); - else - str.~string (); - } } } } |