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const std = @import("std");
const Allocator = std.mem.Allocator;
const eql = std.mem.eql;
const unicode = std.unicode;
const Lexed = @import("Lexed.zig");
iter: unicode.Utf8Iterator,
force_lit: bool = false,
const Self = @This();
pub const Error = error{
InvalidUtf8,
} || Allocator.Error;
pub fn init(content: []const u8) error{InvalidUtf8}!Self {
const view = try unicode.Utf8View.init(content);
return .{ .iter = view.iterator() };
}
pub fn nextKind(self: *Self) ?Lexed.Kind {
const next_rune = self.iter.peek(1);
if (next_rune.len == 0) return null;
return self.getCurrentKind(null, next_rune, &[0]u8{}).kind;
}
pub fn next(self: *Self, alloc: Allocator) Error!?Lexed {
var acc = try std.ArrayList(u8).initCapacity(alloc, 2);
errdefer acc.deinit(alloc);
var current_kind: ?Lexed.Kind = null;
while (self.iter.nextCodepointSlice()) |rune| {
if (eql(u8, rune, "\r")) continue;
var override_if: ?[]const u8 = null;
// escape chars
if (eql(u8, rune, "\\")) {
self.force_lit = true;
current_kind = .literal;
} else {
self.force_lit = false;
const res = self.getCurrentKind(current_kind, rune, acc.items);
current_kind = res.kind;
override_if = res.override_if;
try acc.appendSlice(alloc, rune);
}
// conds here to avoid creating complex condition in while
const next_rune = self.iter.peek(1);
const next_kind = self.getCurrentKind(current_kind, next_rune, acc.items).kind;
if (requiresSpace(current_kind.?) and next_kind != current_kind.?) {
if (eql(u8, next_rune, " ")) {
// consume next space
_ = self.iter.nextCodepoint();
break;
}
current_kind = switch (current_kind.?) {
.title => if (acc.items.len == 1) .tag else .literal,
else => .literal,
};
}
if (next_rune.len > 0 and
next_kind != current_kind.? and
(override_if == null or !eql(u8, override_if.?, next_rune)))
break;
}
const kind = current_kind orelse {
acc.deinit(alloc);
return null;
};
return .init(alloc, kind, acc);
}
const kindRes = struct {
kind: Lexed.Kind,
override_if: ?[]const u8 = null,
fn equals(self: @This(), v: @This()) bool {
if (self.kind != v.kind) return false;
if (self.override_if == null and v.override_if != null) return false;
if (self.override_if != null and v.override_if == null) return false;
if (self.override_if) |it| return eql(u8, it, v.override_if.?);
return true;
}
};
fn requiresDelimiter(before: ?Lexed.Kind, knd: Lexed.Kind) Lexed.Kind {
return if (before == null or before.?.isDelimiter() or before.? == knd) knd else .literal;
}
fn getCurrentKind(self: *Self, before: ?Lexed.Kind, rune: []const u8, acc: []const u8) kindRes {
if (self.force_lit) return .{ .kind = .literal };
if (eql(u8, rune, "\n")) return .{
.kind = if (before == .weak_delimiter) .strong_delimiter else .weak_delimiter,
.override_if = rune,
};
if (eql(u8, rune, "*")) return .{ .kind = .bold };
if (eql(u8, rune, "_")) return .{ .kind = .italic };
if (eql(u8, rune, ">")) return .{ .kind = requiresDelimiter(before, .quote) };
if (eql(u8, rune, ".")) return .{ .kind = requiresDelimiter(before, .list_ordored) };
if (eql(u8, rune, "-")) return .{ .kind = requiresDelimiter(before, .list_unordored) };
if (eql(u8, rune, "!")) return .{ .kind = requiresDelimiter(before, .image) };
if (eql(u8, rune, "<")) return .{ .kind = .ref };
if (is('#', 6, rune, acc)) return .{ .kind = requiresDelimiter(before, .title) };
if (isIn(links, rune, acc, before, .link)) return .{ .kind = .link };
if (isOneOrThree(":", rune, acc, .ref, .callout)) |it| return it;
if (isOneOrThree("$", rune, acc, .math, .math_block)) |it| return it;
if (isOneOrThree("`", rune, acc, .code, .code_block)) |it| return it;
return .{ .kind = .literal };
}
fn is(v: u8, maxLen: usize, rune: []const u8, acc: []const u8) bool {
if (!eql(u8, rune, &[_]u8{v})) return false;
for (acc) |it| if (it != v) return true;
return acc.len < maxLen;
}
const links = &[_][]const u8{ "[", "](", ")" };
fn isIn(ops: []const []const u8, rune: []const u8, p: []const u8, before: ?Lexed.Kind, now: Lexed.Kind) bool {
var acc = p;
if (before) |b| {
if (now != b) acc = &[_]u8{};
}
for (ops) |op| {
const ln = acc.len + rune.len;
if (op.len >= ln and eql(u8, acc, op[0..acc.len]) and eql(u8, rune, op[acc.len..ln]))
return true;
}
return false;
}
fn isOneOrThree(op: []const u8, rune: []const u8, p: []const u8, one: Lexed.Kind, three: Lexed.Kind) ?kindRes {
if (!eql(u8, rune, op)) return null;
var acc = p;
if (acc.len < op.len or !eql(u8, acc[0..op.len], op)) acc = &[_]u8{};
var iter = (unicode.Utf8View.init(acc) catch unreachable).iterator();
var ln: usize = 1; // number of runes
while (iter.nextCodepointSlice()) |it| : (ln += 1) {
if (!eql(u8, it, op)) return null;
}
return switch (ln) {
1 => .{
.kind = one,
.override_if = op,
},
2 => .{
.kind = .literal,
.override_if = op,
},
3 => .{ .kind = three },
else => unreachable,
};
}
fn requiresSpace(k: Lexed.Kind) bool {
return switch (k) {
.title, .list_ordored, .list_unordored => true,
else => false,
};
}
fn doTest(alloc: Allocator, l: *Self, k: Lexed.Kind, v: []const u8) !void {
var first = (try l.next(alloc)).?;
defer first.deinit();
std.testing.expect(first.equals(k, v)) catch |err| {
std.debug.print("{}({s})\n", .{ first.kind, first.content.items });
return err;
};
}
test "one or three" {
const expect = std.testing.expect;
// valid
try expect(isOneOrThree(":", ":", "", .ref, .callout).?.equals(.{ .kind = .ref, .override_if = ":" }));
try expect(isOneOrThree(":", ":", ":", .ref, .callout).?.equals(.{ .kind = .literal, .override_if = ":" }));
try expect(isOneOrThree(":", ":", "::", .ref, .callout).?.equals(.{ .kind = .callout }));
try expect(isOneOrThree(":", ":", "a", .ref, .callout).?.equals(.{ .kind = .ref, .override_if = ":" }));
// invalid
try expect(isOneOrThree(":", "a", "", .ref, .callout) == null);
try expect(isOneOrThree(":", "a", "b", .ref, .callout) == null);
try expect(isOneOrThree(":", "a", ":", .ref, .callout) == null);
}
test "is" {
const expect = std.testing.expect;
// valid
try expect(is('#', 6, "#", ""));
try expect(is('#', 6, "#", "#"));
try expect(is('#', 6, "#", "##"));
try expect(is('#', 6, "#", "###"));
try expect(is('#', 6, "#", "####"));
try expect(is('#', 6, "#", "#####"));
// invalid
try expect(!is('#', 6, "#", "######"));
try expect(!is('#', 6, "u", "##"));
}
test "lexer common" {
const expect = std.testing.expect;
var arena = std.heap.DebugAllocator(.{}).init;
defer if (arena.deinit() == .leak) std.debug.print("leaking!\n", .{});
const alloc = arena.allocator();
var l = try init("## hello world :)");
try doTest(alloc, &l, .title, "##");
try doTest(alloc, &l, .literal, "hello world ");
try doTest(alloc, &l, .ref, ":");
try doTest(alloc, &l, .link, ")");
try expect(try l.next(alloc) == null);
}
test "lexer multiline" {
const expect = std.testing.expect;
var arena = std.heap.DebugAllocator(.{}).init;
defer if (arena.deinit() == .leak) std.debug.print("leaking!\n", .{});
const alloc = arena.allocator();
var l = try init(
\\# Title
\\
\\paragraph
\\# a title
\\a # in sentence
\\
\\#tag
\\#tag2
);
try doTest(alloc, &l, .title, "#");
try doTest(alloc, &l, .literal, "Title");
try doTest(alloc, &l, .strong_delimiter, "\n\n");
try doTest(alloc, &l, .literal, "paragraph");
try doTest(alloc, &l, .weak_delimiter, "\n");
try doTest(alloc, &l, .title, "#");
try doTest(alloc, &l, .literal, "a title");
try doTest(alloc, &l, .weak_delimiter, "\n");
try doTest(alloc, &l, .literal, "a # in sentence");
try doTest(alloc, &l, .strong_delimiter, "\n\n");
try doTest(alloc, &l, .tag, "#");
try doTest(alloc, &l, .literal, "tag");
try doTest(alloc, &l, .weak_delimiter, "\n");
try doTest(alloc, &l, .tag, "#");
try doTest(alloc, &l, .literal, "tag2");
try expect(try l.next(alloc) == null);
}
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