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const std = @import("std");
const Allocator = std.mem.Allocator;
const eql = std.mem.eql;
const Lexed = @import("lexer/Lexed.zig");
const Lexer = @import("lexer/Lexer.zig");
const Element = @import("dom/Element.zig");
const content = @import("content.zig");
const testing = @import("testing.zig");
const doTest = testing.do;
const doTestError = testing.doError;
pub const Error = error{InvalidLink} || Lexer.Error || content.Error;
pub fn parse(alloc: Allocator, l: *Lexer) Error!Element {
var el = try Element.init(alloc, .content, "a");
errdefer el.deinit();
const data = try parseData(alloc, l);
const second = data.second orelse {
el.deinit();
return data.first.?;
};
defer alloc.free(second);
var in = if (data.first) |first| first else try Element.initLitEscaped(alloc, second);
errdefer in.deinit();
try el.appendContent(in);
try el.setAttribute("href", second);
return el;
}
pub const Data = struct {
first: ?Element,
second: ?[]const u8,
};
pub fn parseData(alloc: Allocator, l: *Lexer) Error!Data {
var el = Element.initEmpty(alloc);
errdefer el.deinit();
var v = (try l.next(alloc)).?;
defer v.deinit();
if (v.kind != .link) return Error.InvalidLink;
if (!eql(u8, v.content.items, "[")) {
const first = try Element.initLitEscaped(alloc, v.content.items);
el.deinit();
return .{ .first = first, .second = null };
}
while (l.nextKind()) |kind| {
switch (kind) {
.weak_delimiter, .strong_delimiter => return Error.InvalidLink,
.link => {
var next = (try l.next(alloc)).?;
defer next.deinit();
if (!eql(u8, next.content.items, "](")) return Error.InvalidLink;
break;
},
else => {
const in = try content.parse(alloc, l);
try el.appendContent(in);
},
}
}
var href = try l.next(alloc) orelse return Error.InvalidLink;
defer href.deinit();
if (href.kind != .literal) return Error.InvalidLink;
var finisher = try l.next(alloc) orelse return Error.InvalidLink;
defer finisher.deinit();
if (finisher.kind != .link or !eql(u8, finisher.content.items, ")")) return Error.InvalidLink;
return .{
.first = if (el.content.items.len > 0) el else null,
.second = try href.content.toOwnedSlice(alloc),
};
}
test "parse links" {
var arena = std.heap.DebugAllocator(.{}).init;
defer if (arena.deinit() == .leak) std.debug.print("leaking!\n", .{});
const alloc = arena.allocator();
try doTest(parse, alloc, "[](bar)", "<a href=\"bar\">bar</a>");
try doTest(parse, alloc, "[foo](bar)", "<a href=\"bar\">foo</a>");
try doTest(parse, alloc, "[f*o*o](bar)", "<a href=\"bar\">f<b>o</b>o</a>");
try doTest(parse, alloc, ")", ")");
try doTestError(parse, alloc, "[foo :::](bar)", Error.IllegalPlacement);
try doTestError(parse, alloc, "[foo", Error.InvalidLink);
try doTestError(parse, alloc, "[foo](", Error.InvalidLink);
try doTestError(parse, alloc, "[foo]()", Error.InvalidLink);
}
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