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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 Link = Element.paragraph.Link;
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 || Allocator.Error;
pub fn parse(alloc: Allocator, l: *Lexer) Error!Element {
const data = try parseData(alloc, l);
const second = data.second orelse return data.first.?;
var in = if (data.first) |first| first else (try Element.Literal.init(alloc, second)).element();
errdefer in.deinit(alloc);
return (try Link.init(alloc, in, data.second.?)).element();
}
pub const Data = struct {
first: ?Element,
second: ?[]const u8,
};
pub fn parseData(alloc: Allocator, l: *Lexer) Error!Data {
const v = l.next().?;
if (v.kind != .link) return Error.InvalidLink;
if (!eql(u8, v.content, "[")) {
const el = try Element.Literal.init(alloc, v.content);
return .{ .first = el.element(), .second = null };
}
var el = try Element.Empty.init(alloc);
errdefer el.deinit(alloc);
while (l.peek()) |next| {
switch (next.kind) {
.weak_delimiter, .strong_delimiter => return Error.InvalidLink,
.link => {
l.consume();
if (!eql(u8, next.content, "](")) return Error.InvalidLink;
break;
},
else => {
const in = try content.parse(alloc, l);
try el.content.append(alloc, in);
},
}
}
const href = l.next() orelse return Error.InvalidLink;
if (href.kind != .literal) return Error.InvalidLink;
const finisher = l.next() orelse return Error.InvalidLink;
if (!finisher.equals(.link, ")")) return Error.InvalidLink;
var res = Data{
.first = el.element(),
.second = href.content,
};
if (el.content.items.len == 0) {
res.first = null;
el.deinit(alloc);
}
return res;
}
test "parse links" {
const alloc = std.testing.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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