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const std = @import("std");
const root = @import("root.zig");
const Context = @import("context.zig").Context;
const ParseFn = root.ParseFn;
pub fn LiteralFn(comptime I: type, comptime O: type) type {
return *const fn (comptime literal: []const I, value: O) ParseFn(I, O);
}
pub fn Literal(comptime I: type, comptime O: type) LiteralFn(I, O) {
return struct {
pub fn literal(comptime lit: []const I, value: O) ParseFn(I, O) {
return struct {
pub fn parse(ctx: *Context(I)) !O {
const snapshot = ctx.cursor.snapshot();
errdefer ctx.cursor.rollback(snapshot);
const slice = try ctx.cursor.consume(lit.len);
if (std.mem.eql(I, lit, slice)) {
return value;
}
return error.UnexpectedLiteral;
}
}.parse;
}
}.literal;
}
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