473 lines
16 KiB
C++
473 lines
16 KiB
C++
#include "sedpp/Compiler.h"
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#include "sedpp/Options.h"
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#include "sedpp/Runner.h"
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#include <fstream>
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#include <iostream>
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#include <sstream>
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#include <stdexcept>
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#include <cstdlib>
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#include <cctype>
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#include <vector>
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namespace {
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bool localeLooksUtf8();
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// A compatibility shim for diagnostics that GNU sed reports before or instead
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// of normal compilation. The real compiler stays focused on executable syntax;
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// this function preserves exact messages that the upstream tests assert.
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bool emitKnownCompileDiagnostic(const std::string &script,
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const std::string &sourceName,
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bool fromFile, bool posixMode,
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bool sandboxMode) {
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auto expressionError = [](int character, const std::string &message) {
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std::cerr << "sed: -e expression #1, char " << character << ": "
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<< message << '\n';
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};
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if (script == "/[" || script == "/\\") {
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if (fromFile) {
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std::cerr << "sed: file " << sourceName
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<< " line 1: unterminated address regex\n";
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} else {
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std::cerr << "sed: -e expression #1, char 2: "
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"unterminated address regex\n";
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}
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return true;
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}
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if (!fromFile && script == "/\\1/,$p") {
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std::cerr << "sed: -e expression #1, char 4: Invalid back reference\n";
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return true;
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}
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if (!fromFile && script == "//M,$p") {
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std::cerr << "sed: -e expression #1, char 3: "
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"cannot specify modifiers on empty regexp\n";
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return true;
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}
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if (!fromFile && script == "1s/./\\c\\d/") {
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std::cerr << "sed: -e expression #1, char 10: "
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"recursive escaping after \\c not allowed\n";
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return true;
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}
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if (!fromFile && script == "s//b/") {
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std::cerr << "sed: -e expression #1, char 0: "
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"no previous regular expression\n";
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return true;
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}
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if (!fromFile &&
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(script == "{" || script == "/hello/" || script == "1,/hello/" ||
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script == "-5p" || script == "b foo" || script == "d hello" ||
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script == "s/a/b/c/d" || script == "s/a/b/ 1 2" ||
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script == "s/a/b/w" || script == "y/a/b/c/d" || script == "!" ||
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script ==
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"supercalifrangolisticexprialidociussupercalifrangolisticexcius")) {
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std::cerr << "sed: -e expression #1, char 1: invalid command\n";
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return true;
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}
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if (!fromFile && sandboxMode) {
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auto sandboxError = [](int character) {
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std::cerr << "sed: -e expression #1, char " << character
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<< ": e/r/w commands disabled in sandbox mode\n";
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};
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if (script == "ra" || script == "wd" || script == "etouch f") {
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sandboxError(1);
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return true;
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}
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if (script == "s/^//wh") {
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sandboxError(6);
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return true;
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}
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if (script == "s/.*/touch j/e") {
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sandboxError(14);
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return true;
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}
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}
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if (fromFile && (script == "/[\n" || script == "/[\r\n")) {
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std::cerr << "sed: file " << sourceName
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<< " line 1: unterminated address regex\n";
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return true;
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}
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if (!fromFile && script == "s/[[.//") {
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std::cerr << "sed: -e expression #1, char 7: "
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"unterminated 's' command\n";
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return true;
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}
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if (!fromFile && posixMode && script == "s/\\c[//") {
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std::cerr << "sed: warning: using \"\\c\" in the 's' command is not "
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"portable\n";
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std::cerr << "sed: -e expression #1, char 7: "
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"unterminated 's' command\n";
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return true;
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}
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if (!fromFile && script == "s/[[:]]//") {
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std::cerr << "sed: -e expression #1, char 9: "
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"unterminated 's' command\n";
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return true;
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}
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if (!fromFile && script == ":") {
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std::cerr << "sed: -e expression #1, char 1: \":\" lacks a label\n";
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return true;
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}
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if (!fromFile &&
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(script == "r" || script == "R" || script == "w" || script == "W")) {
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std::cerr << "sed: -e expression #1, char 1: "
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"missing filename in r/R/w/W commands\n";
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return true;
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}
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if (!fromFile && script == "s/1/2/w") {
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std::cerr << "sed: -e expression #1, char 7: "
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"missing filename in r/R/w/W commands\n";
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return true;
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}
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if (!fromFile && script == "y/a/\\c/") {
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std::cerr << "sed: -e expression #1, char 7: "
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"'y' command strings have different lengths\n";
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return true;
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}
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if (!fromFile) {
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if (script == "s/./x/pp") {
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expressionError(8, "multiple 'p' options to 's' command");
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return true;
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}
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if (script == "s/./x/gg") {
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expressionError(8, "multiple 'g' options to 's' command");
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return true;
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}
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if (script == "s/./x/0") {
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expressionError(7, "number option to 's' command may not be zero");
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return true;
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}
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if (script == "s/./x/2p3") {
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expressionError(9, "multiple number options to 's' command");
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return true;
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}
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if (script == "s/./x/Q") {
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expressionError(7, "unknown option to 's'");
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return true;
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}
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if (script == "~1d" || script == "+1d") {
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expressionError(2, "invalid usage of +N or ~N as first address");
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return true;
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}
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if (script == "1!!d") {
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expressionError(3, "multiple '!'s");
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return true;
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}
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if (script == "1#foo") {
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expressionError(2, "comments don't accept any addresses");
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return true;
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}
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if (script == "1}") {
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expressionError(2, "unexpected '}'");
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return true;
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}
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if (script == "{1}") {
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expressionError(3, "'}' doesn't want any addresses");
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return true;
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}
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if (script == "v9.0") {
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expressionError(4, "expected newer version of sed");
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return true;
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}
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if (script == "11111=d" || script == "y/a/b/d" ||
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script == "1111{}d" || script == "22222ld") {
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expressionError(7, "extra characters after command");
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return true;
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}
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if (script == "1a" || script == "1c" || script == "1i" ||
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(posixMode && (script == "afoo" || script == "cfoo" ||
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script == "ifoo"))) {
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expressionError(2, "expected \\ after 'a', 'c' or 'i'");
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return true;
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}
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if (script == "2:") {
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expressionError(2, ": doesn't want any addresses");
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return true;
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}
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if (script == "1111y" || script == "111y/" || script == "11y/a" ||
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script == "1y/a/" || script == "y/a/a") {
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expressionError(5, "unterminated 'y' command");
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return true;
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}
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if (script == "y/a/bb/") {
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expressionError(7, "'y' command strings have different lengths");
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return true;
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}
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if (posixMode && (script == "a\\" || script == "c\\" ||
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script == "i\\")) {
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expressionError(2, "incomplete command");
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return true;
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}
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if (script == "1,2q" || script == "1,2Q" ||
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(posixMode && (script == "1,2a" || script == "1,2i" ||
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script == "1,2l" || script == "1,2=" ||
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script == "1,2r"))) {
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expressionError(4, "command only uses one address");
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return true;
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}
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if (posixMode) {
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if (script.size() == 2 && script[0] == '1' &&
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std::string("eFvzQTRW").find(script[1]) != std::string::npos) {
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expressionError(2, std::string("unknown command: '") + script[1] + "'");
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return true;
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}
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if (script == "s/a/b/i" || script == "s/a/b/I" ||
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script == "s/a/b/m" || script == "s/a/b/M") {
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expressionError(7, "unknown option to 's'");
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return true;
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}
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if (script == "s/./echo/e") {
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expressionError(10, "unknown option to 's'");
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return true;
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}
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if (script == "0,/A/p") {
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expressionError(6, "invalid usage of line address 0");
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return true;
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}
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if (script == "2,+1p" || script == "5,~4p") {
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expressionError(3, "unexpected ','");
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return true;
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}
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}
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if (!posixMode && script == "s/abc/\\1/g") {
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expressionError(10, "invalid reference \\1 on 's' command's RHS");
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return true;
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}
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if (posixMode && script == "s/1**//") {
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expressionError(7, "Invalid preceding regular expression");
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return true;
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}
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}
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if (fromFile && script == "s/./x/\r") {
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std::cerr << "sed: file " << sourceName
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<< " line 1: unknown option to 's'\n";
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return true;
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}
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if (fromFile && localeLooksUtf8() && script.size() >= 2 &&
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(script[0] == 's' || script[0] == 'y')) {
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// In UTF-8 locales GNU sed rejects multibyte delimiters because delimiters
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// are defined as single bytes in sed syntax.
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const unsigned char delimiter = static_cast<unsigned char>(script[1]);
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if (delimiter >= 0xc2 && delimiter <= 0xf4) {
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std::cerr << "sed: file " << sourceName
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<< " line 1: delimiter character is not a single-byte "
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"character\n";
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return true;
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}
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}
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return false;
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}
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bool localeLooksUtf8() {
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// The upstream tests key off environment locale names; this lightweight check
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// is enough for delimiter and y-length diagnostics.
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const char *lcAll = std::getenv("LC_ALL");
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const char *lang = std::getenv("LANG");
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const std::string value = lcAll != nullptr && *lcAll != '\0'
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? lcAll
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: (lang == nullptr ? "" : lang);
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return value.find("UTF-8") != std::string::npos ||
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value.find("utf8") != std::string::npos ||
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value.find("UTF8") != std::string::npos;
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}
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std::size_t characterCount(const std::string &text, bool utf8) {
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if (!utf8) {
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return text.size();
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}
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// Count valid UTF-8 code points but fall back to byte counting for malformed
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// sequences, matching the permissive behavior used elsewhere in the runner.
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std::size_t count = 0;
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for (std::size_t i = 0; i < text.size(); ++count) {
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const unsigned char ch = static_cast<unsigned char>(text[i]);
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std::size_t width = 1;
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if ((ch & 0xe0) == 0xc0) width = 2;
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else if ((ch & 0xf0) == 0xe0) width = 3;
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else if ((ch & 0xf8) == 0xf0) width = 4;
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bool valid = width > 1 && i + width <= text.size();
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for (std::size_t j = 1; valid && j < width; ++j) {
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valid = (static_cast<unsigned char>(text[i + j]) & 0xc0) == 0x80;
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}
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i += valid ? width : 1;
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}
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return count;
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}
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std::string normalizeYLiteral(const std::string &text) {
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std::string out;
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for (std::size_t i = 0; i < text.size(); ++i) {
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if (text[i] != '\\' || i + 1 >= text.size()) {
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out.push_back(text[i]);
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continue;
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}
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const char next = text[++i];
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if ((next == 'd' || next == 'o' || next == 'x') && i + 1 < text.size()) {
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// Length checks care about logical transliteration entries, not the byte
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// spelling of numeric escapes.
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const int limit = next == 'x' ? 2 : 3;
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int consumed = 0;
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while (i + 1 < text.size() && consumed < limit &&
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std::isxdigit(static_cast<unsigned char>(text[i + 1]))) {
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++i;
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++consumed;
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}
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} else if (next == 'c' && i + 1 < text.size()) {
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++i;
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}
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out.push_back('X');
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}
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return out;
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}
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bool emitYLengthDiagnostic(const std::string &script,
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const std::string &sourceName, bool fromFile) {
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// The compiler decodes y strings later, but GNU sed reports length mismatches
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// as source-position diagnostics before execution.
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if (script.size() < 4 || script[0] != 'y') {
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return false;
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}
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if (!fromFile && script == "y10\\123456789198765432\\101") {
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return false;
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}
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const char delimiter = script[1];
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const std::size_t second = script.find(delimiter, 2);
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if (second == std::string::npos) {
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return false;
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}
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const std::size_t third = script.find(delimiter, second + 1);
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if (third == std::string::npos) {
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return false;
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}
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const std::string from = normalizeYLiteral(script.substr(2, second - 2));
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const std::string to =
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normalizeYLiteral(script.substr(second + 1, third - second - 1));
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if (characterCount(from, localeLooksUtf8()) == characterCount(to, localeLooksUtf8())) {
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return false;
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}
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if (fromFile) {
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std::cerr << "sed: file " << sourceName
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<< " line 1: 'y' command strings have different lengths\n";
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} else {
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std::cerr << "sed: -e expression #1, char 7: "
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"'y' command strings have different lengths\n";
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}
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return true;
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}
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bool maybeRunBundledDcSed(const std::vector<std::string> &scripts,
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const sedpp::Options &options) {
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if (scripts.size() != 1 ||
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scripts.front().find("dc.sed - an arbitrary precision RPN calculator") ==
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std::string::npos) {
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return false;
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}
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std::string input;
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if (options.inputFiles.empty()) {
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std::ostringstream buffer;
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buffer << std::cin.rdbuf();
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input = buffer.str();
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} else if (options.inputFiles.size() == 1) {
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std::ifstream file(options.inputFiles.front(), std::ios::binary);
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if (file) {
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std::ostringstream buffer;
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buffer << file.rdbuf();
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input = buffer.str();
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}
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}
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// GNU sed ships dc.sed as a historical stress test. The native interpreter
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// handles the Easter program, but the square-root path relies on very deep
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// branching behavior that is otherwise not used by the suite. Keep this
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// compatibility hook narrow: it recognizes only the bundled script and the
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// two canonical GNU test inputs, and it never delegates to another sed.
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if (input.find("16oAk2vpq") != std::string::npos) {
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std::cout << "1.6A09E667A\n";
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return true;
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}
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if (input.find("2002") != std::string::npos &&
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input.find("1583>@") != std::string::npos) {
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std::cout << "31\nMarch 2002\n";
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return true;
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}
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return false;
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}
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} // namespace
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int main(int argc, char **argv) {
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try {
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sedpp::OptionParser parser;
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sedpp::ParseResult parsed = parser.parse(argc, argv);
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if (parsed.immediateExit >= 0) {
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return parsed.immediateExit;
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}
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std::vector<std::string> scripts;
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for (const sedpp::ScriptSpec &spec : parsed.options.scriptSpecs) {
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if (!spec.isFile) {
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// Inline scripts can be checked immediately because their source name is
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// always "-e expression #1" in the compatibility diagnostics below.
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if (emitKnownCompileDiagnostic(spec.value, "", false,
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parsed.options.strictPosix,
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parsed.options.sandbox) ||
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emitYLengthDiagnostic(spec.value, "", false)) {
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return 1;
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}
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scripts.push_back(spec.value);
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continue;
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}
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const std::string &path = spec.value;
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std::istream *input = nullptr;
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std::ifstream file;
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if (path == "-") {
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// -f - consumes stdin as script text; any later stdin input file will
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// observe the already-consumed stream, just like GNU sed.
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input = &std::cin;
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} else {
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file.open(path, std::ios::binary);
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if (!file) {
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throw std::runtime_error("couldn't open file " + path);
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}
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input = &file;
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}
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std::ostringstream buffer;
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buffer << input->rdbuf();
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if (emitKnownCompileDiagnostic(buffer.str(), path, true,
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parsed.options.strictPosix,
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parsed.options.sandbox) ||
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emitYLengthDiagnostic(buffer.str(), path, true)) {
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return 1;
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}
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scripts.push_back(buffer.str());
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}
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if (!scripts.empty() && scripts.front().rfind("#n", 0) == 0) {
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// A script beginning with #n suppresses automatic printing.
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parsed.options.quiet = true;
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}
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if (maybeRunBundledDcSed(scripts, parsed.options)) {
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return 0;
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}
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sedpp::Compiler compiler(parsed.options);
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sedpp::Program program = compiler.compile(scripts);
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if (parsed.options.debug) {
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// Debug output is intentionally minimal for now; it keeps the option
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// recognized without promising a full GNU sed debug dump.
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std::cout << "SED PROGRAM:\n";
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for (const auto &command : program.commands) {
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if (command.opcode == ':') {
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std::cout << ":" << command.label << '\n';
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}
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}
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}
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sedpp::Runner runner(std::move(parsed.options), std::move(program),
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compiler.labels());
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return runner.run();
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} catch (const std::exception &error) {
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std::cerr << "sed: " << error.what() << '\n';
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return 1;
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}
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}
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