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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 paragraph = @import("paragraph.zig");
const testing = @import("testing.zig");
const doTest = testing.do;
const doTestError = testing.doError;
pub const Error = error{InvalidLink} || content.Error || Allocator.Error;
pub fn parse(alloc: Allocator, l: *Lexer) Error!Element {
const v = l.next().?;
if (v.kind != .link) return Error.InvalidLink;
if (!eql(u8, v.content, "[")) return (try Element.Literal.init(alloc, v.content)).element();
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 in: Element = undefined;
if (el.content.items.len > 0) {
in = el.element();
} else {
el.deinit(alloc);
in = (try Element.Literal.init(alloc, href.content)).element();
}
errdefer in.deinit(alloc);
return (try Link.init(alloc, in, href.content)).element();
}
pub const ImageError = error{InvalidImage} || paragraph.Error || Allocator.Error;
pub fn parseImage(alloc: Allocator, l: *Lexer) ImageError!Element {
_ = l.next().?;
const beg = l.next() orelse return ImageError.InvalidImage;
if (!eql(u8, beg.content, "[")) return ImageError.InvalidImage;
var it = l.next() orelse return ImageError.InvalidImage;
var alt: ?[]const u8 = null;
switch (it.kind) {
.link => if (!eql(u8, it.content, "](")) return ImageError.InvalidImage,
.literal => {
alt = it.content;
const next = l.next() orelse return ImageError.InvalidImage;
if (!next.equals(.link, "](")) return ImageError.InvalidImage;
},
else => return ImageError.InvalidImage,
}
it = l.next() orelse return ImageError.InvalidImage;
if (it.kind != .literal) return ImageError.InvalidImage;
const src = it.content;
it = l.next() orelse return ImageError.InvalidImage;
if (!it.equals(.link, ")")) return ImageError.InvalidImage;
const el = try Element.Image.init(alloc, src);
errdefer el.deinit(alloc);
el.alt = alt;
it = l.peek() orelse return el.element();
switch (it.kind) {
.strong_delimiter => return el.element(),
.weak_delimiter => l.consume(),
else => return ImageError.InvalidImage,
}
const p = try paragraph.parse(alloc, l);
errdefer p.deinit(alloc);
const p_el: *Element.paragraph.Block = @ptrCast(@alignCast(p.ptr));
el.source = (try p_el.toEmpty(alloc)).element();
return el.element();
}
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);
}
test "parse image" {
const alloc = std.testing.allocator;
try doTest(parseImage, alloc, "", "<figure><img src=\"src\"></figure>");
try doTest(parseImage, alloc, "", "<figure><img src=\"src\" alt=\"alt\"></figure>");
try doTest(parseImage, alloc,
\\
\\caption
\\on multiple lines!
\\
\\not in
, "<figure><img src=\"foo\" alt=\"bar\"><figcaption>caption on multiple lines!</figcaption></figure>");
}
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