feat(ast): parse paragraph

1 files changed, 59 insertions, 0 deletions

diff --git a/src/paragraph.zig b/src/paragraph.zig
new file mode 100644
index 0000000..75651f4
--- /dev/null
+++ b/src/paragraph.zig
@@ -0,0 +1,59 @@
+const std = @import("std");
+const Lexed = @import("lexer/Lexed.zig");
+const Lexer = @import("lexer/Lexer.zig");
+const Element = @import("dom/Element.zig");
+const Allocator = std.mem.Allocator;
+const ast = @import("ast.zig");
+const Error = ast.Error;
+
+pub fn parseParagraph(alloc: Allocator, l: *Lexer) Error!Element {
+    var el = try Element.init(alloc, .content, "p");
+    while (l.nextKind()) |kind| {
+        switch (kind) {
+            // because nextKind returns only an hint for the next rune
+            .weak_delimiter => {
+                var v = (try l.next(alloc)).?;
+                defer v.deinit();
+                if (v.kind == .strong_delimiter) return el;
+                const next = l.nextKind() orelse return el;
+                switch (next) {
+                    .literal, .italic, .code, .bold => try el.appendContent(try Element.initLit(alloc, " ")),
+                    else => return el,
+                }
+            },
+            else => try el.appendContent(try parseContent(alloc, l)),
+        }
+    }
+    return el;
+}
+
+pub fn parseContent(alloc: Allocator, l: *Lexer) Error!Element {
+    var content = Element.initEmpty(alloc);
+    const v = (try l.next(alloc)).?;
+    switch (v.kind) {
+        .literal => {
+            const el = try Element.initLitEscaped(alloc, v.content.items);
+            try content.appendContent(el);
+        },
+        .bold => try content.appendContent(try parseModifier(alloc, l, .bold, "b")),
+        .italic => try content.appendContent(try parseModifier(alloc, l, .italic, "em")),
+        .code => try content.appendContent(try parseModifier(alloc, l, .code, "code")),
+        else => return Error.InvalidSequence,
+    }
+    return content;
+}
+
+fn parseModifier(alloc: Allocator, l: *Lexer, knd: Lexed.Kind, tag: []const u8) Error!Element {
+    var el = try Element.init(alloc, .content, tag);
+    while (l.nextKind()) |it| {
+        if (it == knd) {
+            // consuming the finisher
+            var v = (try l.next(alloc)).?;
+            v.deinit();
+            break;
+        }
+        if (it.isDelimiter()) return Error.UnclosedModifier;
+        try el.appendContent(try parseContent(alloc, l));
+    }
+    return el;
+}