feat(): support callout

1 files changed, 87 insertions, 0 deletions

diff --git a/src/callout.zig b/src/callout.zig
new file mode 100644
index 0000000..2761944
--- /dev/null
+++ b/src/callout.zig
@@ -0,0 +1,87 @@
+const std = @import("std");
+const Allocator = std.mem.Allocator;
+const eql = std.mem.eql;
+const Token = @import("lexer/Token.zig");
+const Lexer = @import("lexer/Lexer.zig");
+const Element = @import("eval/Element.zig");
+const testing = @import("testing.zig");
+const paragraph = @import("paragraph.zig");
+const doTest = testing.do;
+const doTestError = testing.doError;
+
+pub const Error = error{InvalidCallout} || paragraph.Error || Allocator.Error;
+
+pub fn parse(alloc: Allocator, l: *Lexer) Error!Element {
+    _ = l.next();
+    var beg = l.next() orelse return Error.InvalidCallout;
+    var kind: ?[]const u8 = null;
+    var title: ?[]const u8 = null;
+    switch (beg.kind) {
+        .literal => {
+            var iter = std.mem.splitAny(u8, beg.content, " ");
+            kind = iter.first();
+            if (iter.peek() != null) title = iter.buffer[iter.index.?..];
+            beg = l.next() orelse return Error.InvalidCallout;
+            if (!beg.kind.isDelimiter()) return Error.InvalidCallout;
+        },
+        else => if (!beg.kind.isDelimiter()) return Error.InvalidCallout,
+    }
+    var root = try Element.Root.init(alloc);
+    while (l.peek()) |it| {
+        if (it.kind == .callout) {
+            l.consume();
+            break;
+        }
+        if (it.kind.isDelimiter()) {
+            const next = l.peek() orelse return Error.InvalidCallout;
+            if (next.kind == .callout) {
+                l.consume();
+                break;
+            }
+        }
+        try root.append(try paragraph.parse(root.allocator(), l));
+        _ = l.peek() orelse return Error.InvalidCallout;
+    }
+    var el = try Element.Callout.init(alloc, root.element());
+    el.kind = kind;
+    el.title = title;
+    const end = l.next() orelse return el.element();
+    if (!end.kind.isDelimiter()) return Error.InvalidCallout;
+    return el.element();
+}
+
+test "callout" {
+    const alloc = std.testing.allocator;
+
+    try doTest(parse, alloc,
+        \\:::
+        \\hey
+        \\:::
+    , "<div class=\"callout\"><p>hey</p></div>");
+    try doTest(parse, alloc,
+        \\:::info
+        \\hey
+        \\:::
+    , "<div data-callout=\"info\" class=\"callout\"><p>hey</p></div>");
+    try doTest(parse, alloc,
+        \\:::info Title
+        \\hey
+        \\:::
+    , "<div data-callout=\"info\" class=\"callout\"><p>hey</p></div>");
+    // cannot test content with \n
+
+    try doTestError(parse, alloc, ":::", Error.InvalidCallout);
+    try doTestError(parse, alloc,
+        \\:::
+        \\hey
+    , Error.InvalidCallout);
+    try doTestError(parse, alloc,
+        \\:::
+        \\hey:::
+    , Error.IllegalPlacement);
+    try doTestError(parse, alloc,
+        \\:::
+        \\hey
+        \\::: nope
+    , Error.InvalidCallout);
+}