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- package regex_vm
- /*
- (c) Copyright 2024 Feoramund <[email protected]>.
- Made available under Odin's BSD-3 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_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_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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