Initial project import

tools/v/vlib/v2_toberemoved/builder/util.v

@@ -0,0 +1,146 @@
+// Copyright (c) 2020-2024 Joe Conigliaro. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module builder
+
+import os
+import v2.pref
+
+fn list_dir_entries(path string) []string {
+	mut entries := os.ls(path) or { []string{} }
+	entries.sort()
+	return entries
+}
+
+pub fn get_v_files_from_dir(dir string, user_defines []string, target_os string) []string {
+	if dir == '' {
+		return []string{}
+	}
+	mod_files := list_dir_entries(dir)
+	mut v_files := []string{}
+	mut defaults := []string{}
+	for file in mod_files {
+		if file == '' {
+			continue
+		}
+		// Include .v files (including .c.v), exclude .js.v and test files
+		if !file.ends_with('.v') || file.ends_with('.js.v') || file.contains('_test.') {
+			continue
+		}
+		// skip platform-specific files
+		if file.contains('.arm64.') || file.contains('.arm32.') || file.contains('.amd64.') {
+			continue
+		}
+		// Skip files specialized for a different target OS before parsing/type checking.
+		if pref.file_has_incompatible_os_suffix(file, target_os) {
+			continue
+		}
+		if file.ends_with('prealloc.c.v') && 'prealloc' !in user_defines {
+			continue
+		}
+		// Conditional compilation files: _d_<feature> included when -d <feature> is set,
+		// _notd_<feature> included when -d <feature> is NOT set.
+		if file.contains('_notd_') {
+			feature := extract_define_feature(file, '_notd_')
+			if feature.len > 0 && feature in user_defines {
+				continue
+			}
+		} else if file.contains('_d_') {
+			feature := extract_define_feature(file, '_d_')
+			if feature.len == 0 || feature !in user_defines {
+				continue
+			}
+		}
+		path := os.join_path(dir, file)
+		if path == '' {
+			continue
+		}
+		// Collect _default.c.v files separately; they are only included when
+		// no platform-specific variant exists (e.g. _darwin.c.v, _linux.c.v).
+		if file.contains('default.c.v') {
+			defaults << path
+		} else {
+			v_files << path
+		}
+	}
+	// Add _default.c.v files only when no platform-specific variant was selected.
+	for dfile in defaults {
+		no_postfix := fname_without_platform_postfix(dfile)
+		mut has_specialized := false
+		for vf in v_files {
+			if fname_without_platform_postfix(vf) == no_postfix {
+				has_specialized = true
+				break
+			}
+		}
+		if !has_specialized {
+			v_files << dfile
+		}
+	}
+	return v_files
+}
+
+// fname_without_platform_postfix strips the platform-specific suffix from a file path,
+// so that e.g. "free_memory_impl_darwin.c.v" and "free_memory_impl_default.c.v" both
+// map to the same key, allowing detection of specialized vs default variants.
+fn fname_without_platform_postfix(file string) string {
+	return file.replace_each([
+		'default.c.v',
+		'_',
+		'windows.c.v',
+		'_',
+		'linux.c.v',
+		'_',
+		'darwin.c.v',
+		'_',
+		'macos.c.v',
+		'_',
+		'android.c.v',
+		'_',
+		'android_outside_termux.c.v',
+		'_',
+		'termux.c.v',
+		'_',
+		'ios.c.v',
+		'_',
+		'freebsd.c.v',
+		'_',
+		'openbsd.c.v',
+		'_',
+		'netbsd.c.v',
+		'_',
+		'dragonfly.c.v',
+		'_',
+		'bsd.c.v',
+		'_',
+		'solaris.c.v',
+		'_',
+		'qnx.c.v',
+		'_',
+		'serenity.c.v',
+		'_',
+		'plan9.c.v',
+		'_',
+		'vinix.c.v',
+		'_',
+		'nix.c.v',
+		'_',
+	])
+}
+
+// extract_define_feature extracts the feature name from a _d_ or _notd_ filename.
+// e.g. "parse_d_parallel.v" with marker "_d_" returns "parallel"
+// e.g. "array_notd_gcboehm_opt.v" with marker "_notd_" returns "gcboehm_opt"
+fn extract_define_feature(file string, marker string) string {
+	idx := file.index(marker) or { return '' }
+	rest := file[idx + marker.len..]
+	// Strip .v or .c.v suffix
+	feature := if rest.ends_with('.c.v') {
+		rest[..rest.len - 4]
+	} else if rest.ends_with('.v') {
+		rest[..rest.len - 2]
+	} else {
+		rest
+	}
+	return feature
+}