diff options
Diffstat (limited to 'libbuild2/script/parser.cxx')
| -rw-r--r-- | libbuild2/script/parser.cxx | 201 |
1 files changed, 130 insertions, 71 deletions
diff --git a/libbuild2/script/parser.cxx b/libbuild2/script/parser.cxx index c199c0e..c371e5b 100644 --- a/libbuild2/script/parser.cxx +++ b/libbuild2/script/parser.cxx @@ -2061,6 +2061,7 @@ namespace build2 else if (n == "elif") r = line_type::cmd_elif; else if (n == "elif!") r = line_type::cmd_elifn; else if (n == "else") r = line_type::cmd_else; + else if (n == "while") r = line_type::cmd_while; else if (n == "end") r = line_type::cmd_end; else { @@ -2091,8 +2092,8 @@ namespace build2 exec_lines (lines::const_iterator i, lines::const_iterator e, const function<exec_set_function>& exec_set, const function<exec_cmd_function>& exec_cmd, - const function<exec_if_function>& exec_if, - size_t& li, + const function<exec_cond_function>& exec_cond, + const iteration_index* ii, size_t& li, variable_pool* var_pool) { try @@ -2116,6 +2117,69 @@ namespace build2 next (t, tt); const location ll (get_location (t)); + // If end is true, then find the flow control construct's end ('end' + // line). Otherwise, find the flow control construct's block end + // ('end', 'else', etc). If skip is true then increment the command + // line index. + // + auto fcend = [e, &li] (lines::const_iterator j, + bool end, + bool skip) -> lines::const_iterator + { + // We need to be aware of nested flow control constructs. + // + 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 || + lt == line_type::cmd_while) + ++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: + case line_type::cmd_while: ++li; break; + default: break; + } + } + } + + assert (false); // Missing end. + return e; + }; + switch (lt) { case line_type::var: @@ -2151,7 +2215,7 @@ namespace build2 single = true; } - exec_cmd (t, tt, li++, single, ll); + exec_cmd (t, tt, ii, li++, single, ll); replay_stop (); break; @@ -2167,7 +2231,7 @@ namespace build2 bool take; if (lt != line_type::cmd_else) { - take = exec_if (t, tt, li++, ll); + take = exec_cond (t, tt, ii, li++, ll); if (lt == line_type::cmd_ifn || lt == line_type::cmd_elifn) take = !take; @@ -2180,94 +2244,89 @@ namespace build2 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::const_iterator j, - bool end, - bool skip) -> lines::const_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). + // lines until the next if-else line and then skip all the lines + // until the end (unless we are already at the end). // // Otherwise, we need to skip all the lines until the next // if-else line and then continue parsing. // if (take) { - // Next if-else. + // Find block end. // - lines::const_iterator j (next (i, false, false)); + lines::const_iterator j (fcend (i, false, false)); + if (!exec_lines (i + 1, j, - exec_set, exec_cmd, exec_if, - li, + exec_set, exec_cmd, exec_cond, + ii, li, var_pool)) return false; - i = j->type == line_type::cmd_end ? j : next (j, true, true); + // Find construct end. + // + i = j->type == line_type::cmd_end ? j : fcend (j, true, true); } else { - i = next (i, false, true); + // Find block end. + // + i = fcend (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_while: + { + size_t wli (li); + + for (iteration_index wi {1, ii};; wi.index++) + { + next (t, tt); // Skip to start of command. + + bool exec (exec_cond (t, tt, &wi, li++, ll)); + + replay_stop (); + + // If the condition evaluates to true, then we need to parse + // all the lines until the end line, prepare for the condition + // reevaluation, and re-iterate. + // + // Otherwise, we need to skip all the lines until the end + // line, bail out from the loop, and continue parsing. + // + if (exec) + { + // Find construct end. + // + lines::const_iterator j (fcend (i, true, false)); + + if (!exec_lines (i + 1, j, + exec_set, exec_cmd, exec_cond, + &wi, li, + var_pool)) + return false; + + // Prepare for the condition reevaluation. + // + replay_data (replay_tokens (ln.tokens)); + next (t, tt); + li = wli; + } + else + { + // Find construct end. + // + i = fcend (i, true, true); + break; // Bail out from the while-loop. + } + } + + break; + } case line_type::cmd_end: { assert (false); |