diff options
Diffstat (limited to 'libbuild2/test/script/parser.cxx')
| -rw-r--r-- | libbuild2/test/script/parser.cxx | 218 |
1 files changed, 137 insertions, 81 deletions
diff --git a/libbuild2/test/script/parser.cxx b/libbuild2/test/script/parser.cxx index f302aee..f85b185 100644 --- a/libbuild2/test/script/parser.cxx +++ b/libbuild2/test/script/parser.cxx @@ -311,10 +311,11 @@ namespace build2 // enter: next token is peeked at (type in tt) // leave: newline - assert (!fct || - *fct == line_type::cmd_if || - *fct == line_type::cmd_while || - *fct == line_type::cmd_for); + assert (!fct || + *fct == line_type::cmd_if || + *fct == line_type::cmd_while || + *fct == line_type::cmd_for_stream || + *fct == line_type::cmd_for_args); // Note: token is only peeked at. // @@ -324,6 +325,52 @@ namespace build2 // line_type lt; type st (type::eos); // Later, can only be set to plus or minus. + bool semi (false); + + // Parse the command line tail, starting from the newline or the + // potential colon/semicolon token. + // + // Note that colon and semicolon are only valid in test command lines + // and after 'end' in flow control constructs. Note that we always + // recognize them lexically, even when they are not valid tokens per + // the grammar. + // + auto parse_command_tail = [&t, &tt, &st, <, &d, &semi, &ll, this] () + { + if (tt != type::newline) + { + if (lt != line_type::cmd && lt != line_type::cmd_end) + fail (t) << "expected newline instead of " << t; + + switch (st) + { + case type::plus: fail (t) << t << " after setup command" << endf; + case type::minus: fail (t) << t << " after teardown command" << endf; + } + } + + switch (tt) + { + case type::colon: + { + if (d) + fail (ll) << "both leading and trailing descriptions"; + + d = parse_trailing_description (t, tt); + break; + } + case type::semi: + { + semi = true; + replay_pop (); // See above for the reasoning. + next (t, tt); // Get newline. + break; + } + } + + if (tt != type::newline) + fail (t) << "expected newline instead of " << t; + }; switch (tt) { @@ -371,10 +418,12 @@ namespace build2 { const string& n (t.value); + // Handle the for-loop consistently with pre_parse_line_start(). + // if (n == "if") lt = line_type::cmd_if; else if (n == "if!") lt = line_type::cmd_ifn; else if (n == "while") lt = line_type::cmd_while; - else if (n == "for") lt = line_type::cmd_for; + else if (n == "for") lt = line_type::cmd_for_stream; } break; @@ -388,8 +437,6 @@ namespace build2 // Pre-parse the line keeping track of whether it ends with a semi. // - bool semi (false); - line ln; switch (lt) { @@ -436,47 +483,80 @@ namespace build2 break; } - case line_type::cmd_for: + // + // See pre_parse_line_start() for details. + // + case line_type::cmd_for_args: assert (false); break; + case line_type::cmd_for_stream: { - // First take care of the variable name. There is no reason not to - // support variable attributes. + // First we need to sense the next few tokens and detect which + // form of the for-loop that actually is (see + // libbuild2/build/script/parser.cxx for details). // - mode (lexer_mode::normal); + token pt (t); + assert (pt.type == type::word && pt.value == "for"); + mode (lexer_mode::for_loop); next_with_attributes (t, tt); - attributes_push (t, tt); - - if (tt != type::word || t.qtype != quote_type::unquoted) - fail (t) << "expected variable name instead of " << t; string& n (t.value); - if (special_variable (n)) - fail (t) << "attempt to set '" << n << "' variable directly"; + if (tt == type::lsbrace || // Attributes. + (tt == type::word && // Variable name. + t.qtype == quote_type::unquoted && + (n[0] == '_' || + alpha (n[0]) || + n == "*" || + n == "~" || + n == "@"))) + { + attributes_push (t, tt); - ln.var = &script_->var_pool.insert (move (n)); + if (tt != type::word || t.qtype != quote_type::unquoted) + fail (t) << "expected variable name instead of " << t; - next (t, tt); + if (special_variable (n)) + fail (t) << "attempt to set '" << n << "' variable directly"; - if (tt != type::colon) + if (lexer_->peek_char ().first == ':') + lt = line_type::cmd_for_args; + } + + if (lt == line_type::cmd_for_stream) // for x <... { - // @@ TMP We will need to fallback to parsing the 'for x <...' - // form instead. - // - fail (t) << "expected ':' instead of " << t - << " after variable name"; + ln.var = nullptr; + + expire_mode (); + + parse_command_expr_result r ( + parse_command_expr (t, tt, + lexer::redirect_aliases, + move (pt))); + + assert (r.for_loop); + + parse_command_tail (); + parse_here_documents (t, tt, r); } + else // for x: ... + { + ln.var = &script_->var_pool.insert (move (n)); - expire_mode (); // Expire the normal lexer mode. + next (t, tt); - // Parse the value similar to the var line type (see above), - // except for the fact that we don't expect a trailing semicolon. - // - mode (lexer_mode::variable_line); - parse_variable_line (t, tt); + assert (tt == type::colon); - if (tt != type::newline) - fail (t) << "expected newline instead of " << t << " after for"; + expire_mode (); + + // Parse the value similar to the var line type (see above), + // except for the fact that we don't expect a trailing semicolon. + // + mode (lexer_mode::variable_line); + parse_variable_line (t, tt); + + if (tt != type::newline) + fail (t) << "expected newline instead of " << t << " after for"; + } break; } @@ -501,51 +581,20 @@ namespace build2 // Fall through. case line_type::cmd: { - pair<command_expr, here_docs> p; + parse_command_expr_result r; if (lt != line_type::cmd_else && lt != line_type::cmd_end) - p = parse_command_expr (t, tt, lexer::redirect_aliases); + r = parse_command_expr (t, tt, lexer::redirect_aliases); - // Colon and semicolon are only valid in test command lines and - // after 'end' in a flow control construct. Note that we still - // recognize them lexically, they are just not valid tokens per - // the grammar. - // - if (tt != type::newline) + if (r.for_loop) { - if (lt != line_type::cmd && lt != line_type::cmd_end) - fail (t) << "expected newline instead of " << t; - - switch (st) - { - case type::plus: fail (t) << t << " after setup command" << endf; - case type::minus: fail (t) << t << " after teardown command" << endf; - } - } - - switch (tt) - { - case type::colon: - { - if (d) - fail (ll) << "both leading and trailing descriptions"; - - d = parse_trailing_description (t, tt); - break; - } - case type::semi: - { - semi = true; - replay_pop (); // See above for the reasoning. - next (t, tt); // Get newline. - break; - } + lt = line_type::cmd_for_stream; + ln.var = nullptr; } - if (tt != type::newline) - fail (t) << "expected newline instead of " << t; + parse_command_tail (); + parse_here_documents (t, tt, r); - parse_here_documents (t, tt, p); break; } } @@ -579,7 +628,8 @@ namespace build2 break; } case line_type::cmd_while: - case line_type::cmd_for: + case line_type::cmd_for_stream: + case line_type::cmd_for_args: { semi = pre_parse_loop (t, tt, lt, d, *ls); break; @@ -608,7 +658,8 @@ namespace build2 case line_type::cmd_if: case line_type::cmd_ifn: case line_type::cmd_while: - case line_type::cmd_for: + case line_type::cmd_for_stream: + case line_type::cmd_for_args: { // See if this is a variable-only flow control construct. // @@ -951,7 +1002,7 @@ namespace build2 // size_t i (ls.size ()); - line_type fct; // Flow control type the block type relates to. + line_type fct; // Flow control construct type the block type relates to. switch (bt) { @@ -965,7 +1016,8 @@ namespace build2 break; } case line_type::cmd_while: - case line_type::cmd_for: + case line_type::cmd_for_stream: + case line_type::cmd_for_args: { fct = bt; break; @@ -1068,7 +1120,9 @@ namespace build2 // enter: <newline> (previous line) // leave: <newline> - assert (lt == line_type::cmd_while || lt == line_type::cmd_for); + assert (lt == line_type::cmd_while || + lt == line_type::cmd_for_stream || + lt == line_type::cmd_for_args); tt = peek (lexer_mode::first_token); @@ -1428,7 +1482,7 @@ namespace build2 // Note: this one is only used during execution. - pair<command_expr, here_docs> p ( + parse_command_expr_result pr ( parse_command_expr (t, tt, lexer::redirect_aliases)); if (tt == type::colon) @@ -1436,10 +1490,10 @@ namespace build2 assert (tt == type::newline); - parse_here_documents (t, tt, p); + parse_here_documents (t, tt, pr); assert (tt == type::newline); - command_expr r (move (p.first)); + command_expr r (move (pr.expr)); // If the test program runner is specified, then adjust the // expressions to run test programs via this runner. @@ -1582,6 +1636,7 @@ namespace build2 auto exec_cmd = [&ct, this] (token& t, build2::script::token_type& tt, const iteration_index* ii, size_t li, bool single, + const function<command_function>& cf, const location& ll) { // We use the 0 index to signal that this is the only command. @@ -1593,7 +1648,7 @@ namespace build2 command_expr ce ( parse_command_line (t, static_cast<token_type&> (tt))); - runner_->run (*scope_, ce, ct, ii, li, ll); + runner_->run (*scope_, ce, ct, ii, li, cf, ll); }; auto exec_cond = [this] (token& t, build2::script::token_type& tt, @@ -1827,7 +1882,8 @@ namespace build2 // The rest. // - // When add a special variable don't forget to update lexer::word(). + // When add a special variable don't forget to update lexer::word() and + // for-loop parsing in pre_parse_line(). // bool parser:: special_variable (const string& n) noexcept |