1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116

use crate::rust::{string::String, borrow::ToOwned};
use super::invoke::{Invoke, Identity};
use crate::elements;

/// Export entry builder
pub struct ExportBuilder<F=Identity> {
	callback: F,
	field: String,
	binding: elements::Internal,
}

impl ExportBuilder {
	/// New export builder
	pub fn new() -> Self {
		ExportBuilder::with_callback(Identity)
	}
}

impl<F> ExportBuilder<F> {

	/// New export entry builder in the specified chained context
	pub fn with_callback(callback: F) -> Self {
		ExportBuilder {
			callback: callback,
			field: String::new(),
			binding: elements::Internal::Function(0),
		}
	}

	/// Set the field name of the export entry
	pub fn field(mut self, field: &str) -> Self {
		self.field = field.to_owned();
		self
	}

	/// Specify the internal module mapping for this entry
	pub fn with_internal(mut self, external: elements::Internal) -> Self {
		self.binding = external;
		self
	}

	/// Start the internal builder for this export entry
	pub fn internal(self) -> ExportInternalBuilder<Self> {
		ExportInternalBuilder::with_callback(self)
	}
}

impl<F> ExportBuilder<F> where F: Invoke<elements::ExportEntry> {
	/// Finalize export entry builder spawning the resulting struct
	pub fn build(self) -> F::Result {
		self.callback.invoke(elements::ExportEntry::new(self.field, self.binding))
	}
}

impl<F> Invoke<elements::Internal> for ExportBuilder<F> {
	type Result = Self;
	fn invoke(self, val: elements::Internal) -> Self {
		self.with_internal(val)
	}
}

/// Internal mapping builder for export entry
pub struct ExportInternalBuilder<F=Identity> {
	callback: F,
	binding: elements::Internal,
}

impl<F> ExportInternalBuilder<F> where F: Invoke<elements::Internal> {
	/// New export entry internal mapping for the chained context
	pub fn with_callback(callback: F) -> Self {
		ExportInternalBuilder{
			callback: callback,
			binding: elements::Internal::Function(0),
		}
	}

	/// Map to function by index
	pub fn func(mut self, index: u32) -> F::Result {
		self.binding = elements::Internal::Function(index);
		self.callback.invoke(self.binding)
	}

	/// Map to memory
	pub fn memory(mut self, index: u32) -> F::Result {
		self.binding = elements::Internal::Memory(index);
		self.callback.invoke(self.binding)
	}

	/// Map to table
	pub fn table(mut self, index: u32) -> F::Result {
		self.binding = elements::Internal::Table(index);
		self.callback.invoke(self.binding)
	}

	/// Map to global
	pub fn global(mut self, index: u32) -> F::Result {
		self.binding = elements::Internal::Global(index);
		self.callback.invoke(self.binding)
	}
}

/// New builder for export entry
pub fn export() -> ExportBuilder {
	ExportBuilder::new()
}

#[cfg(test)]
mod tests {
	use super::export;

	#[test]
	fn example() {
		let entry = export().field("memory").internal().memory(0).build();
		assert_eq!(entry.field(), "memory");
	}
}