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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 testing = @import("testing.zig");
const doTest = testing.doMath;
const doTestError = testing.doError;
pub const Error = error{InvalidMathBlock} || Allocator.Error;
pub fn parse(alloc: Allocator, l: *Lexer) Error!Element {
_ = l.next();
const beg = l.next() orelse return Error.InvalidMathBlock;
if (!beg.kind.isDelimiter()) return Error.InvalidMathBlock;
const math = try Element.Math.Block.init(alloc);
var acc = try std.ArrayList(u8).initCapacity(alloc, 2);
while (l.next()) |it| {
if (it.kind == .math_block) return Error.InvalidMathBlock;
try acc.appendSlice(alloc, it.content);
// restore modifications done by the lexer
if (it.kind.requiresSpace())
try acc.append(alloc, ' ');
if (it.kind.isDelimiter()) {
const next = l.peek() orelse return Error.InvalidMathBlock;
if (next.kind == .math_block) break;
}
}
var end = l.next() orelse return Error.InvalidMathBlock;
if (end.kind != .math_block) return Error.InvalidMathBlock;
const el = try Element.Figure.init(alloc, math.element());
math.content = try acc.toOwnedSlice(alloc);
end = l.next() orelse return el.element();
if (!end.kind.isDelimiter()) return Error.InvalidMathBlock;
return el.element();
}
test {
const alloc = std.testing.allocator;
try doTest(parse, alloc,
\\$$$
\\x
\\$$$
, "<figure>" ++ @embedFile("data/block_1.svg") ++ "</figure>");
try doTest(parse, alloc,
\\$$$
\\x^2
\\$$$
, "<figure>" ++ @embedFile("data/block_2.svg") ++ "</figure>");
try doTest(parse, alloc,
\\$$$
\\forall x in RR, quad f(x) = x^2
\\$$$
, "<figure>" ++ @embedFile("data/block_3.svg") ++ "</figure>");
}
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