mirror of
https://github.com/ksherlock/mpw.git
synced 2024-12-22 00:29:18 +00:00
add minimal support for if / else / end statements
This commit is contained in:
Kelvin Sherlock
parent
4af7d59c9c
commit
fc5e675a51
@ -47,10 +47,10 @@ LinkIIGS TheHeader.aii.obj IRModule.p.obj ?
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'\n' => {
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// terminate the command.
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if (!token.empty()) {
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argv.push_back(strdup(token.c_str()));
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argv.push_back(std::move(token));
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token.clear();
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}
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if (argv.size() > 1) {
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if (!argv.empty()) {
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int ok = launch_command(argv);
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if (ok != 0) {
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fprintf(stderr, "command failed with exit code %d\n", ok);
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@ -58,21 +58,20 @@ LinkIIGS TheHeader.aii.obj IRModule.p.obj ?
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}
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}
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for (auto cp : argv) { free(cp); }
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argv.clear();
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argv.push_back(strdup("mpw"));
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};
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[ \t]+ => {
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// token separator.
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if (!token.empty()) {
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argv.push_back(strdup(token.c_str()));
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argv.push_back(std::move(token));
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token.clear();
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}
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};
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'"{' [A-Za-z][A-Za-z0-9]* '}"' => {
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// environment variable. remove quotes.
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// also expand if possible.
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token.append(ts + 1, te - 1);
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};
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@ -104,12 +103,13 @@ namespace {
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}
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extern int launch_command(std::vector<char *> &argv);
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//extern int launch_command(std::vector<char *> &argv);
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extern int launch_command(const std::vector<std::string> &argv);
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int parse_makefile(int fd) {
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std::string token;
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std::vector<char *> argv;
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std::vector<std::string> argv;
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unsigned char buffer[4096];
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@ -126,9 +126,6 @@ int parse_makefile(int fd) {
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%% write init;
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// strdup so it can be free() later.
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argv.push_back(strdup("mpw"));
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bool done = false;
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while (!done) {
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@ -174,7 +171,7 @@ int parse_makefile(int fd) {
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}
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// any remaining argv?
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if (argv.size() > 1) {
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if (!argv.empty()) {
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fprintf(stderr, "warning: unterminated line\n");
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int ok = launch_command(argv);
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@ -184,8 +181,5 @@ int parse_makefile(int fd) {
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}
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}
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for (auto cp : argv) { free(cp); }
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argv.clear();
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return 0;
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}
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247
bin/mpw-make.cpp
247
bin/mpw-make.cpp
@ -9,13 +9,18 @@
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#include <cstdio>
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#include <cstring>
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#include <cerrno>
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#include <cctype>
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#include <algorithm>
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#include <functional>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include <unistd.h>
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#include <sysexits.h>
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#include <string>
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#include <vector>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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@ -24,7 +29,10 @@
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int parse_makefile(int fd);
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void help(void);
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void launch_make(std::vector<char *> &argv);
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void print_command(const std::vector<char *> &argv);
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void print_command(const std::vector<char *> &argv, bool active);
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void print_command(const std::vector<std::string> &argv, bool active);
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int launch_command(const std::vector<std::string> &argv);
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int launch_command(std::vector<char *> &argv);
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bool dry_run = false;
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@ -56,6 +64,175 @@ void help(void) {
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}
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std::string &lowercase(std::string &s) {
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std::transform(std::begin(s), std::end(s), std::begin(s), std::tolower);
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return s;
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}
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std::unordered_map<std::string, std::string> environment;
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std::unordered_map<std::string, std::function<int(const std::vector<std::string> &)>> builtins;
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/*
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* 0 = active
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* 1+ = nesting level.
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*/
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unsigned if_status = 0;
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/* true/false if true condition encountered at this level */
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std::vector<unsigned> if_stack;
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int builtin_set(const std::vector<std::string> &argv) {
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// Set name value
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bool active = if_status == 0;
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print_command(argv, active);
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if (!active) return 0;
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if (argv.size() != 3) return 1;
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std::string key = argv[1];
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std::string value = argv[2];
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// lower-case key...
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lowercase(key);
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// c++17 has insert_or_assign
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environment[std::move(key)] = std::move(value);
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return 0;
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}
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bool evaluate(const std::vector<std::string> &v)
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{
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return false;
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}
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int builtin_if(const std::vector<std::string> &argv) {
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/*
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* if expression
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* ...
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* [else if expression]
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* [else]
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* end
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*/
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bool active = (if_status == 0);
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print_command(argv, active);
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if (if_status) {
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if_stack.push_back(false);
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++if_status;
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return 0;
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}
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// todo... actually evaluate expression.
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bool ok = evaluate(argv);
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if_stack.push_back(ok);
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if (!ok) ++if_status;
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return 0;
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}
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int builtin_else(const std::vector<std::string> &argv) {
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// else
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// else if ....
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print_command(argv, if_status < 2);
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if (if_stack.empty()) {
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fprintf(stderr, "ELSE without IF\n");
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return -1;
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}
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unsigned &processed = if_stack.back();
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// best case -- entire if/else/end stmt is inactive.
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if (if_status > 1) {
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return 0;
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}
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// second best case -- a true condition has already been found.
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if (processed) {
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if_status = 1;
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return 0;
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}
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// third case -- evalute a naked else
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if (argv.size() == 1) {
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processed = true;
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if_status = 0;
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return 0;
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}
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// fourth case -- evaluate and else if
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bool ok = evaluate(argv);
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if (ok) {
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processed = true;
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if_status = 0;
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return 0;
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} else {
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if_status = 1;
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return 0;
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}
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}
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int builtin_end(const std::vector<std::string> &argv) {
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print_command(argv, if_status < 2);
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if (if_stack.empty()) {
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fprintf(stderr, "END without IF\n");
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return 1;
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}
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if_stack.pop_back();
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if (if_status) {
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--if_status;
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}
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return 0;
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}
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int builtin_echo(const std::vector<std::string> &argv) {
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// echo [-n] ...
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bool active = (if_status == 0);
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print_command(argv, active);
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if (!active) return 0;
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if (dry_run) return 0;
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bool n = false;
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bool printed = false;
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for (auto iter = argv.begin() + 1; iter != argv.end(); ++iter) {
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const std::string &s = *iter;
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if (s.length() == 2 && s == "-n") {
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n = true;
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continue;
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}
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if (printed) fputs(" ", stdout);
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fputs(s.c_str(), stdout);
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printed = true;
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}
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if (!n) fputs("\n", stdout);
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return 0;
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}
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void launch_make(std::vector<char *> &argv) {
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int ok;
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@ -67,14 +244,26 @@ void launch_make(std::vector<char *> &argv) {
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exit(EX_OSERR);
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}
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void print_command(const std::vector<char *> &argv) {
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void print_command(const std::vector<char *> &argv, bool active) {
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if (!active) printf("# ");
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for (auto cp : argv) {
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if (cp) printf("%s ", cp);
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}
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printf("\n");
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}
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void print_command(const std::vector<std::string> &argv, bool active) {
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if (!active) printf("# ");
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for (const auto &cp : argv) {
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printf("%s ", cp.c_str());
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}
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printf("\n");
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}
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int launch_command(std::vector<char *> &argv) {
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int pid;
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@ -84,10 +273,11 @@ int launch_command(std::vector<char *> &argv) {
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// wait for a return status.
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//puts(cmd.c_str());
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if (argv.empty() || argv.back() != nullptr)
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argv.push_back(nullptr);
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bool active = (if_status == 0);
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print_command(argv);
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print_command(argv, active);
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if (!active) return 0;
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if (dry_run) {
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printf("\n");
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return 0;
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@ -124,19 +314,62 @@ int launch_command(std::vector<char *> &argv) {
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}
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int launch_command(const std::vector<std::string> &argv) {
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if (argv.empty()) return 0;
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std::string cmd = argv[0];
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lowercase(cmd);
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auto iter = builtins.find(cmd);
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if (iter != builtins.end()) return iter->second(argv);
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std::vector<char *> cargv;
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cargv.reserve(argv.size()+2);
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// convert to char * for exec, add "mpw", and remove blanks.
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cargv.push_back(strdup("mpw"));
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for (const auto &s : argv) {
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if (!s.empty()) cargv.push_back(strdup(s.c_str()));
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}
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// and 0-terminate.
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cargv.push_back(nullptr);
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int rv = launch_command(cargv);
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std::for_each(cargv.begin(), cargv.end(), free);
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return rv;
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}
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int main(int argc, char **argv) {
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int pipes[2];
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int ok;
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int child;
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#if 0
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builtins.emplace("if", builtin_if);
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builtins.emplace("end", builtin_end);
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builtins.emplace("else", builtin_else);
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builtins.emplace("set", builtin_set);
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#endif
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builtins = {
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{"if", builtin_if},
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{"end", builtin_end},
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{"else", builtin_else},
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{"set", builtin_set},
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{"echo", builtin_echo},
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};
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std::vector<char *>new_argv;
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new_argv.push_back((char *)"mpw");
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new_argv.push_back((char *)"Make");
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//new_argv.insert(new_argv.end(), argv + 1, argv + argc);
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// filter out --help and --dry-run
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