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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;
pub const Error = error{
InvalidSequence,
UnclosedModifier,
FeatureNotSupported,
} || Lexer.Error;
pub fn parse(parent: Allocator, content: []const u8) Error![]const u8 {
var arena = std.heap.ArenaAllocator.init(parent);
defer arena.deinit();
const alloc = arena.allocator();
var elements = try std.ArrayList(Element).initCapacity(alloc, 2);
var l = try Lexer.init(content);
while (l.nextKind()) |it| {
switch (it) {
.literal, .bold, .italic, .code => try elements.append(alloc, try parseContent(alloc, &l)),
else => return Error.FeatureNotSupported,
}
}
var res = try std.ArrayList(u8).initCapacity(parent, elements.items.len);
for (elements.items) |it| {
var v = it;
try res.appendSlice(parent, try v.render(alloc));
}
return res.toOwnedSlice(parent);
}
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;
}
fn doTest(alloc: Allocator, t: []const u8, v: []const u8) !void {
const g = try parse(alloc, t);
defer alloc.free(g);
std.testing.expect(std.mem.eql(u8, g, v)) catch |err| {
std.debug.print("{s}\n", .{g});
return err;
};
}
test "parse content" {
var arena = std.heap.DebugAllocator(.{}).init;
defer if (arena.deinit() == .leak) std.debug.print("leaking!\n", .{});
const alloc = arena.allocator();
try doTest(alloc, "hello world", "hello world");
try doTest(alloc, "*hello* world", "<b>hello</b> world");
try doTest(alloc, "*he_ll_o* world", "<b>he<em>ll</em>o</b> world");
}
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