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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 testing = @import("testing.zig");
const doTest = testing.do;
const doTestError = testing.doError;
pub const Error = error{InvalidCodeBlock} || Allocator.Error;
pub fn parse(alloc: Allocator, l: *Lexer) Error!Element {
_ = l.next();
var beg = l.next() orelse return Error.InvalidCodeBlock;
var data: ?[]const u8 = null;
switch (beg.kind) {
.literal => {
data = beg.content;
beg = l.next() orelse return Error.InvalidCodeBlock;
if (!beg.kind.isDelimiter()) return Error.InvalidCodeBlock;
},
else => if (!beg.kind.isDelimiter()) return Error.InvalidCodeBlock,
}
const code = try Element.Code.init(alloc);
code.attribute = data;
const el = try Element.Figure.init(alloc, code.element());
errdefer el.deinit(alloc);
while (l.next()) |it| {
if (it.kind == .code_block) return Error.InvalidCodeBlock;
if (it.kind.isDelimiter()) {
const next = l.peek() orelse return Error.InvalidCodeBlock;
if (next.kind == .code_block) break;
}
try code.content.append(alloc, (try Element.Literal.init(alloc, it.content)).element());
// restore modifications done by the lexer
if (it.kind.requiresSpace())
try code.content.append(alloc, (try Element.Literal.init(alloc, " ")).element());
}
var end = l.next() orelse return Error.InvalidCodeBlock;
if (end.kind != .code_block) return Error.InvalidCodeBlock;
end = l.next() orelse return el.element();
if (!end.kind.isDelimiter()) return Error.InvalidCodeBlock;
return el.element();
}
test "code" {
const alloc = std.testing.allocator;
try doTest(parse, alloc,
\\```
\\hey
\\```
, "<figure><pre><code>hey</code></pre></figure>");
try doTest(parse, alloc,
\\```td another
\\hey
\\```
, "<figure><pre data-code=\"td another\"><code>hey</code></pre></figure>");
// cannot test content with \n
try doTestError(parse, alloc, "```", Error.InvalidCodeBlock);
try doTestError(parse, alloc,
\\```
\\hey
, Error.InvalidCodeBlock);
try doTestError(parse, alloc,
\\```
\\hey```
, Error.InvalidCodeBlock);
try doTestError(parse, alloc,
\\```
\\hey
\\``` nope
, Error.InvalidCodeBlock);
}
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