1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
const std = @import("std");
const Allocator = std.mem.Allocator;
const Token = @import("lexer/Token.zig");
const Lexer = @import("lexer/Lexer.zig");
const Element = @import("eval/Element.zig");
const parser = @import("parser.zig");
const link = @import("link.zig");
const testing = @import("testing.zig");
const doTest = testing.do;
const doTestError = testing.doError;
pub const Error = error{ ModifierNotClosed, IllegalPlacement } || Allocator.Error;
pub fn parse(alloc: Allocator, l: *Lexer) Error!Element {
var content = try Element.Root.init(alloc);
const v = l.next().?;
switch (v.kind) {
.literal => {
const el = try Element.Literal.init(alloc, v.content);
content.append(el);
},
.bold => content.append(try parseModifier(alloc, l, .bold, "b")),
.italic => content.append(try parseModifier(alloc, l, .italic, "em")),
.code => content.append(try parseModifier(alloc, l, .code, "code")),
.math => content.append(try parseMath(alloc, l)),
else => return Error.IllegalPlacement,
}
return content.element();
}
fn parseModifier(alloc: Allocator, l: *Lexer, knd: Token.Kind, comptime tag: []const u8) Error!Element {
var el = try Element.Simple(tag).init(alloc);
var root = try Element.Root.init(alloc);
el.content = root.element();
while (l.peek()) |next| {
if (next.kind == knd) {
// consuming the finisher
l.consume();
return el.element();
}
if (next.kind.isDelimiter()) return Error.ModifierNotClosed;
root.append(try parse(alloc, l));
}
return Error.ModifierNotClosed;
}
fn parseMath(alloc: Allocator, l: *Lexer) Error!Element {
const el = try Element.Math.Content.init(alloc);
var acc = try std.ArrayList(u8).initCapacity(alloc, 2);
while (l.next()) |it| {
if (it.kind == .math) {
el.content = try acc.toOwnedSlice(alloc);
return el.element();
}
if (it.kind.isDelimiter()) return Error.ModifierNotClosed;
try acc.appendSlice(alloc, it.content);
}
return Error.ModifierNotClosed;
}
|
