substr.c File Reference

Implements the OP_SUBSTR opcode for extracting substrings in the VM. More...

Go to the source code of this file.

Functions
	if (str.type !=VAL_STRING||startv.type !=VAL_INT||lenv.type !=VAL_INT)
	free_value (str)
	free_value (startv)
	free_value (lenv)
	push_value (vm, out)

Variables
case	OP_SUBSTR
Value	startv = pop_value(vm)
Value	str = pop_value(vm)
Value	out = bi_substr(&str, (int)startv.i, (int)lenv.i)
	break

Detailed Description

Implements the OP_SUBSTR opcode for extracting substrings in the VM.

This file handles the OP_SUBSTR instruction, which extracts a substring from a string using a start index and length. The length, start index, and string are popped from the stack, and the resulting substring is pushed back.

Behavior:

• Pops the length, start index, and string from the stack.
• Extracts the substring from the string.
• Pushes the resulting substring onto the stack.

Error Handling:

• Exits with an error if the operands are not integers or strings.
• Exits with an error if the start index or length is out of bounds.

Example: // Bytecode: OP_SUBSTR // Stack before: [5, 6, "hello world"] // Stack after: ["world"]

Author

Johannes Findeisen

Date

2025-10-16

Definition in file substr.c.

Function Documentation

free_value() [1/3]

free_value

(

lenv

)

free_value() [2/3]

free_value

(

startv

)

free_value() [3/3]

free_value

(

str

)

if()

if

(

str.type !

= VAL_STRING || startv.type != VAL_INT || lenv.type != VAL_INT

)

Definition at line 40 of file substr.c.

push_value()

push_value	(	vm	,
		out	)

Variable Documentation

break

break

Definition at line 49 of file substr.c.

OP_SUBSTR

case OP_SUBSTR

Definition at line 36 of file substr.c.

out

Value out = bi_substr(&str, (int)startv.i, (int)lenv.i)

Definition at line 44 of file substr.c.

startv

Value startv = pop_value(vm)

Definition at line 38 of file substr.c.

str

Value str = pop_value(vm)

Definition at line 39 of file substr.c.