Merge pull request #4774 from ziglang/zig-cc

ability to use `zig cc` as a drop-in C compiler

src-self-hosted/clang_options.zig

@@ -0,0 +1,126 @@
+const std = @import("std");
+const mem = std.mem;
+
+pub const list = @import("clang_options_data.zig").data;
+
+pub const CliArg = struct {
+    name: []const u8,
+    syntax: Syntax,
+
+    /// TODO we're going to want to change this when we start shipping self-hosted because this causes
+    /// all the functions in stage2.zig to get exported.
+    zig_equivalent: @import("stage2.zig").ClangArgIterator.ZigEquivalent,
+
+    /// Prefixed by "-"
+    pd1: bool = false,
+
+    /// Prefixed by "--"
+    pd2: bool = false,
+
+    /// Prefixed by "/"
+    psl: bool = false,
+
+    pub const Syntax = union(enum) {
+        /// A flag with no values.
+        flag,
+
+        /// An option which prefixes its (single) value.
+        joined,
+
+        /// An option which is followed by its value.
+        separate,
+
+        /// An option which is either joined to its (non-empty) value, or followed by its value.
+        joined_or_separate,
+
+        /// An option which is both joined to its (first) value, and followed by its (second) value.
+        joined_and_separate,
+
+        /// An option followed by its values, which are separated by commas.
+        comma_joined,
+
+        /// An option which consumes an optional joined argument and any other remaining arguments.
+        remaining_args_joined,
+
+        /// An option which is which takes multiple (separate) arguments.
+        multi_arg: u8,
+    };
+
+    pub fn matchEql(self: CliArg, arg: []const u8) u2 {
+        if (self.pd1 and arg.len >= self.name.len + 1 and
+            mem.startsWith(u8, arg, "-") and mem.eql(u8, arg[1..], self.name))
+        {
+            return 1;
+        }
+        if (self.pd2 and arg.len >= self.name.len + 2 and
+            mem.startsWith(u8, arg, "--") and mem.eql(u8, arg[2..], self.name))
+        {
+            return 2;
+        }
+        if (self.psl and arg.len >= self.name.len + 1 and
+            mem.startsWith(u8, arg, "/") and mem.eql(u8, arg[1..], self.name))
+        {
+            return 1;
+        }
+        return 0;
+    }
+
+    pub fn matchStartsWith(self: CliArg, arg: []const u8) usize {
+        if (self.pd1 and arg.len >= self.name.len + 1 and
+            mem.startsWith(u8, arg, "-") and mem.startsWith(u8, arg[1..], self.name))
+        {
+            return self.name.len + 1;
+        }
+        if (self.pd2 and arg.len >= self.name.len + 2 and
+            mem.startsWith(u8, arg, "--") and mem.startsWith(u8, arg[2..], self.name))
+        {
+            return self.name.len + 2;
+        }
+        if (self.psl and arg.len >= self.name.len + 1 and
+            mem.startsWith(u8, arg, "/") and mem.startsWith(u8, arg[1..], self.name))
+        {
+            return self.name.len + 1;
+        }
+        return 0;
+    }
+};
+
+/// Shortcut function for initializing a `CliArg`
+pub fn flagpd1(name: []const u8) CliArg {
+    return .{
+        .name = name,
+        .syntax = .flag,
+        .zig_equivalent = .other,
+        .pd1 = true,
+    };
+}
+
+/// Shortcut function for initializing a `CliArg`
+pub fn joinpd1(name: []const u8) CliArg {
+    return .{
+        .name = name,
+        .syntax = .joined,
+        .zig_equivalent = .other,
+        .pd1 = true,
+    };
+}
+
+/// Shortcut function for initializing a `CliArg`
+pub fn jspd1(name: []const u8) CliArg {
+    return .{
+        .name = name,
+        .syntax = .joined_or_separate,
+        .zig_equivalent = .other,
+        .pd1 = true,
+    };
+}
+
+/// Shortcut function for initializing a `CliArg`
+pub fn sepd1(name: []const u8) CliArg {
+    return .{
+        .name = name,
+        .syntax = .separate,
+        .zig_equivalent = .other,
+        .pd1 = true,
+    };
+}