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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 } || Lexer.Error || Allocator.Error;
pub fn parse(alloc: Allocator, l: *Lexer) Error!Element {
var content = try Element.Empty.init(alloc);
errdefer content.deinit(alloc);
const v = l.next().?;
switch (v.kind) {
.literal => {
const el = try Element.Literal.init(alloc, v.content);
try content.content.append(alloc, el.element());
},
.bold => try content.content.append(alloc, try parseModifier(alloc, l, .bold, "b")),
.italic => try content.content.append(alloc, try parseModifier(alloc, l, .italic, "em")),
.code => try content.content.append(alloc, try parseModifier(alloc, l, .code, "code")),
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);
errdefer el.deinit(alloc);
while (l.peek()) |next| {
if (next.kind == knd) {
// consuming the finisher
l.consume();
return el.element();
}
if (next.kind.isDelimiter()) return Error.ModifierNotClosed;
try el.content.append(alloc, try parse(alloc, l));
}
return Error.ModifierNotClosed;
}
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