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package regex_vm
/*
(c) Copyright 2024 Feoramund <rune@swevencraft.org>.
Made available under Odin's license.
List of contributors:
Feoramund: Initial implementation.
*/
Opcode_Iterator :: struct {
code: Program,
pc: int,
}
iterate_opcodes :: proc(iter: ^Opcode_Iterator) -> (opcode: Opcode, pc: int, ok: bool) {
if iter.pc >= len(iter.code) {
return
}
opcode = iter.code[iter.pc]
pc = iter.pc
ok = true
switch opcode {
case .Match: iter.pc += size_of(Opcode)
case .Match_And_Exit: iter.pc += size_of(Opcode)
case .Byte: iter.pc += size_of(Opcode) + size_of(u8)
case .Rune: iter.pc += size_of(Opcode) + size_of(rune)
case .Rune_Class: iter.pc += size_of(Opcode) + size_of(u8)
case .Rune_Class_Negated: iter.pc += size_of(Opcode) + size_of(u8)
case .Wildcard: iter.pc += size_of(Opcode)
case .Jump: iter.pc += size_of(Opcode) + size_of(u16)
case .Split: iter.pc += size_of(Opcode) + 2 * size_of(u16)
case .Save: iter.pc += size_of(Opcode) + size_of(u8)
case .Assert_Start: iter.pc += size_of(Opcode)
case .Assert_Start_Multiline: iter.pc += size_of(Opcode)
case .Assert_End: iter.pc += size_of(Opcode)
case .Assert_Word_Boundary: iter.pc += size_of(Opcode)
case .Assert_Non_Word_Boundary: iter.pc += size_of(Opcode)
case .Multiline_Open: iter.pc += size_of(Opcode)
case .Multiline_Close: iter.pc += size_of(Opcode)
case .Wait_For_Byte: iter.pc += size_of(Opcode) + size_of(u8)
case .Wait_For_Rune: iter.pc += size_of(Opcode) + size_of(rune)
case .Wait_For_Rune_Class: iter.pc += size_of(Opcode) + size_of(u8)
case .Wait_For_Rune_Class_Negated: iter.pc += size_of(Opcode) + size_of(u8)
case .Match_All_And_Escape: iter.pc += size_of(Opcode)
case:
panic("Invalid opcode found in RegEx program.")
}
return
}
opcode_to_name :: proc(opcode: Opcode) -> (str: string) {
switch opcode {
case .Match: str = "Match"
case .Match_And_Exit: str = "Match_And_Exit"
case .Byte: str = "Byte"
case .Rune: str = "Rune"
case .Rune_Class: str = "Rune_Class"
case .Rune_Class_Negated: str = "Rune_Class_Negated"
case .Wildcard: str = "Wildcard"
case .Jump: str = "Jump"
case .Split: str = "Split"
case .Save: str = "Save"
case .Assert_Start: str = "Assert_Start"
case .Assert_Start_Multiline: str = "Assert_Start_Multiline"
case .Assert_End: str = "Assert_End"
case .Assert_Word_Boundary: str = "Assert_Word_Boundary"
case .Assert_Non_Word_Boundary: str = "Assert_Non_Word_Boundary"
case .Multiline_Open: str = "Multiline_Open"
case .Multiline_Close: str = "Multiline_Close"
case .Wait_For_Byte: str = "Wait_For_Byte"
case .Wait_For_Rune: str = "Wait_For_Rune"
case .Wait_For_Rune_Class: str = "Wait_For_Rune_Class"
case .Wait_For_Rune_Class_Negated: str = "Wait_For_Rune_Class_Negated"
case .Match_All_And_Escape: str = "Match_All_And_Escape"
case: str = "<UNKNOWN>"
}
return
}
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