tiny.smg.tree.runtime.scanner

1pub const scanner = @import("scanner.zig");

1const std = @import("std");2const scanners = @import("../scanner/root.zig");34const abi = @import("abi.zig");5const lexer = @import("lexer.zig");67pub const Kind = enum {8    zig,9    javascript,10    typescript,11    tsx,12    c,13    cpp,14};1516pub const State = union(enum) {17    none,18    cpp: scanners.cpp.Scanner,1920    pub fn init(kind: Kind) State {21        return if (kind == .cpp) .{ .cpp = .{} } else .none;22    }2324    pub fn eql(left: State, right: State) bool {25        if (std.meta.activeTag(left) != std.meta.activeTag(right)) return false;26        return switch (left) {27            .none => true,28            .cpp => |value| std.meta.eql(value, right.cpp),29        };30    }3132    pub fn isEmpty(self: State) bool {33        return switch (self) {34            .none => true,35            .cpp => |value| value.delimiter_length == 0,36        };37    }38};3940pub fn scan(kind: Kind, state: *State, input: *lexer.Lexer, valid: []const bool) bool {41    return switch (kind) {42        .zig, .c => false,43        .javascript => blk: {44            var value = scanners.javascript.Scanner{};45            break :blk value.scan(input, @bitCast(bits(u8, valid)));46        },47        .typescript, .tsx => blk: {48            var value = scanners.typescript.Scanner{};49            break :blk value.scan(input, @bitCast(bits(u16, valid)));50        },51        .cpp => state.cpp.scan(input, @bitCast(bits(u8, valid))),52    };53}5455fn bits(comptime T: type, valid: []const bool) T {56    var result: T = 0;57    for (valid, 0..) |enabled, index| {58        if (enabled) result |= @as(T, 1) << @intCast(index);59    }60    return result;61}6263test "scanner state is copied by value" {64    var left = State.init(.cpp);65    const right = left;66    try std.testing.expect(left.eql(right));67    left.cpp.delimiter_length = 1;68    try std.testing.expect(!left.eql(right));69}7071test "runtime scanner dispatch never calls grammar link anchors" {72    var state = State.init(.javascript);73    var input = lexer.Lexer.init("}", .{ .byte = 0, .point = .{ .row = 0, .column = 0 } });74    input.start();75    var valid = @as([8]bool, @splat(false));76    valid[0] = true;77    try std.testing.expect(scan(.javascript, &state, &input, &valid));78    try std.testing.expectEqual(@as(abi.Symbol, 0), input.abi.result_symbol);79}