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const std = @import("std");
const Allocator = std.mem.Allocator;
const Lexed = @import("lexer/Lexed.zig");
const Lexer = @import("lexer/Lexer.zig");
const Element = @import("dom/Element.zig");
const parser = @import("parser.zig");
pub const Error = error{ ModifierNotClosed, IllegalPlacement } || Lexer.Error;
pub fn parse(alloc: Allocator, l: *Lexer) Error!Element {
var el = try Element.init(alloc, .content, "p");
errdefer el.deinit();
while (l.nextKind()) |kind| {
switch (kind) {
// because nextKind returns only an hint for the next rune
.weak_delimiter => {
var v = (try l.next(alloc)).?;
defer v.deinit();
if (v.kind == .strong_delimiter) return el;
const next = l.nextKind() orelse return el;
switch (next) {
.literal, .italic, .code, .bold => try el.appendContent(try Element.initLit(alloc, " ")),
else => return el,
}
},
else => try el.appendContent(try parseLine(alloc, l)),
}
}
return el;
}
pub fn parseLine(alloc: Allocator, l: *Lexer) Error!Element {
var content = Element.initEmpty(alloc);
errdefer content.deinit();
while (l.nextKind()) |kind| {
switch (kind) {
.weak_delimiter, .strong_delimiter => return content,
else => {
const el = try parseContent(alloc, l);
try content.appendContent(el);
},
}
}
return content;
}
fn parseContent(alloc: Allocator, l: *Lexer) Error!Element {
var content = Element.initEmpty(alloc);
errdefer content.deinit();
var v = (try l.next(alloc)).?;
defer v.deinit();
switch (v.kind) {
.literal => {
const el = try Element.initLitEscaped(alloc, v.content.items);
try content.appendContent(el);
},
.bold => try content.appendContent(try parseModifier(alloc, l, .bold, "b")),
.italic => try content.appendContent(try parseModifier(alloc, l, .italic, "em")),
.code => try content.appendContent(try parseModifier(alloc, l, .code, "code")),
else => return Error.IllegalPlacement,
}
return content;
}
fn parseModifier(alloc: Allocator, l: *Lexer, knd: Lexed.Kind, tag: []const u8) Error!Element {
var el = try Element.init(alloc, .content, tag);
errdefer el.deinit();
while (l.nextKind()) |it| {
if (it == knd) {
// consuming the finisher
var v = (try l.next(alloc)).?;
v.deinit();
return el;
}
if (it.isDelimiter()) return Error.ModifierNotClosed;
try el.appendContent(try parseContent(alloc, l));
}
return Error.ModifierNotClosed;
}
fn doTest(alloc: Allocator, t: []const u8, v: []const u8) !void {
var l = try Lexer.init(t);
var p = try parse(alloc, &l);
defer p.deinit();
const g = try p.render(alloc);
defer alloc.free(g);
std.testing.expect(std.mem.eql(u8, g, v)) catch |err| {
std.debug.print("{s}\n", .{g});
return err;
};
}
fn doTestError(alloc: Allocator, t: []const u8, err: Error) !void {
var l = try Lexer.init(t);
_ = parse(alloc, &l) catch |e| return std.testing.expect(err == e);
return std.testing.expect(false);
}
test "parse paragraphs" {
var arena = std.heap.DebugAllocator(.{}).init;
defer if (arena.deinit() == .leak) std.debug.print("leaking!\n", .{});
const alloc = arena.allocator();
try doTest(alloc, "hello world", "<p>hello world</p>");
try doTest(alloc, "*hello* world", "<p><b>hello</b> world</p>");
try doTest(alloc, "*he_ll_o* world", "<p><b>he<em>ll</em>o</b> world</p>");
try doTestError(alloc, "hello *world", Error.ModifierNotClosed);
try doTestError(alloc, "hello *wo_rld*", Error.ModifierNotClosed);
try doTestError(alloc, "*hell*o *wo_rld*", Error.ModifierNotClosed);
try doTestError(alloc, "hello ::: world", Error.IllegalPlacement);
}
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