1 files changed, 74 insertions, 9 deletions
diff --git a/src/root.zig b/src/root.zig
index 2bc3125..bd183ff 100644
--- a/src/root.zig
+++ b/src/root.zig
@@ -1,19 +1,84 @@
 const std = @import("std");
 pub const parser = @import("parser.zig");
+pub const Error = parser.Error;
 
-pub fn bufferedPrint() !void {
-    // Stdout is for the actual output of your application, for example if you
-    // are implementing gzip, then only the compressed bytes should be sent to
-    // stdout, not any debugging messages.
-    var stdout_buffer: [1024]u8 = undefined;
-    var stdout_writer = std.fs.File.stdout().writer(&stdout_buffer);
-    const stdout = &stdout_writer.interface;
+fn getErrorCode(err: Error) u8 {
+    return switch (err) {
+        Error.OutOfMemory => 1,
+        Error.InvalidUtf8 => 2,
+        Error.FeatureNotSupported => 3,
+        Error.ModifierNotClosed => 4,
+        Error.InvalidTitleContent => 5,
+    };
+}
 
-    try stdout.print("Run `zig build test` to run the tests.\n", .{});
+/// Returns the static string linked with the error code.
+export fn getErrorString(code: u8) [*:0]const u8 {
+    return switch (code) {
+        1 => "out of memory",
+        2 => "invalid UTF-8",
+        3 => "feature not supported",
+        4 => "modifier not closed",
+        5 => "invalid title content",
+        else => unreachable,
+    };
+}
 
-    try stdout.flush(); // Don't forget to flush!
+/// Parse the content.
+/// Code is a pointer to an u8 populated with an error code > 0.
+///
+/// Returns a not null strings and set the code to 0 if everything is fine.
+/// Else, it returns null and set an error code above 0.
+/// Use getErrorString to retrieve the string linked with the error code.
+export fn parse(content: [*:0]const u8, code: *u8) ?[*:0]const u8 {
+    const alloc = std.heap.c_allocator;
+    const res = parser.parse(alloc, std.mem.span(content)) catch |err| {
+        code.* = getErrorCode(err);
+        return null;
+    };
+    defer alloc.free(res);
+    code.* = 0;
+    return alloc.dupeZ(u8, res) catch |err| {
+        code.* = getErrorCode(err);
+        return null;
+    };
 }
 
 test {
     std.testing.refAllDeclsRecursive(@This());
 }
+
+fn doTest(content: [*:0]const u8, exp: []const u8, exp_code: u8) !void {
+    const expect = std.testing.expect;
+
+    var code: u8 = undefined;
+    const raw = parse(content, &code) orelse {
+        expect(code == exp_code) catch |err| {
+            std.debug.print("{}\n", .{code});
+            return err;
+        };
+        return;
+    };
+    const res = std.mem.span(raw);
+    defer std.heap.c_allocator.free(res);
+
+    expect(code == 0) catch |err| {
+        std.debug.print("{}\n", .{code});
+        return err;
+    };
+    expect(std.mem.eql(u8, exp, res)) catch |err| {
+        std.debug.print("{s}\n", .{res});
+        return err;
+    };
+}
+
+test "exported parse" {
+    // valid
+    try doTest("hello world", "<p>hello world</p>", 0);
+    try doTest("he*ll*o world", "<p>he<b>ll</b>o world</p>", 0);
+    try doTest("# title", "<h1>title</h1>", 0);
+
+    // invalid
+    try doTest("he*llo world", "", getErrorCode(Error.ModifierNotClosed));
+    try doTest("# title :::", "", getErrorCode(Error.InvalidTitleContent));
+}