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/**
* Vim State Transition Table
*
* This is the scannable source of truth for state transitions.
* To understand what happens in any state, look up that state's transition function.
*/
import { resolveMotion } from './motions.js'
import {
executeIndent,
executeJoin,
executeLineOp,
executeOpenLine,
executeOperatorFind,
executeOperatorG,
executeOperatorGg,
executeOperatorMotion,
executeOperatorTextObj,
executePaste,
executeReplace,
executeToggleCase,
executeX,
type OperatorContext,
} from './operators.js'
import {
type CommandState,
FIND_KEYS,
type FindType,
isOperatorKey,
isTextObjScopeKey,
MAX_VIM_COUNT,
OPERATORS,
type Operator,
SIMPLE_MOTIONS,
TEXT_OBJ_SCOPES,
TEXT_OBJ_TYPES,
type TextObjScope,
} from './types.js'
/**
* Context passed to transition functions.
*/
export type TransitionContext = OperatorContext & {
onUndo?: () => void
onDotRepeat?: () => void
}
/**
* Result of a transition.
*/
export type TransitionResult = {
next?: CommandState
execute?: () => void
}
/**
* Main transition function. Dispatches based on current state type.
*/
export function transition(
state: CommandState,
input: string,
ctx: TransitionContext,
): TransitionResult {
switch (state.type) {
case 'idle':
return fromIdle(input, ctx)
case 'count':
return fromCount(state, input, ctx)
case 'operator':
return fromOperator(state, input, ctx)
case 'operatorCount':
return fromOperatorCount(state, input, ctx)
case 'operatorFind':
return fromOperatorFind(state, input, ctx)
case 'operatorTextObj':
return fromOperatorTextObj(state, input, ctx)
case 'find':
return fromFind(state, input, ctx)
case 'g':
return fromG(state, input, ctx)
case 'operatorG':
return fromOperatorG(state, input, ctx)
case 'replace':
return fromReplace(state, input, ctx)
case 'indent':
return fromIndent(state, input, ctx)
}
}
// ============================================================================
// Shared Input Handling
// ============================================================================
/**
* Handle input that's valid in both idle and count states.
* Returns null if input is not recognized.
*/
function handleNormalInput(
input: string,
count: number,
ctx: TransitionContext,
): TransitionResult | null {
if (isOperatorKey(input)) {
return { next: { type: 'operator', op: OPERATORS[input], count } }
}
if (SIMPLE_MOTIONS.has(input)) {
return {
execute: () => {
const target = resolveMotion(input, ctx.cursor, count)
ctx.setOffset(target.offset)
},
}
}
if (FIND_KEYS.has(input)) {
return { next: { type: 'find', find: input as FindType, count } }
}
if (input === 'g') return { next: { type: 'g', count } }
if (input === 'r') return { next: { type: 'replace', count } }
if (input === '>' || input === '<') {
return { next: { type: 'indent', dir: input, count } }
}
if (input === '~') {
return { execute: () => executeToggleCase(count, ctx) }
}
if (input === 'x') {
return { execute: () => executeX(count, ctx) }
}
if (input === 'J') {
return { execute: () => executeJoin(count, ctx) }
}
if (input === 'p' || input === 'P') {
return { execute: () => executePaste(input === 'p', count, ctx) }
}
if (input === 'D') {
return { execute: () => executeOperatorMotion('delete', '$', 1, ctx) }
}
if (input === 'C') {
return { execute: () => executeOperatorMotion('change', '$', 1, ctx) }
}
if (input === 'Y') {
return { execute: () => executeLineOp('yank', count, ctx) }
}
if (input === 'G') {
return {
execute: () => {
// count=1 means no count given, go to last line
// otherwise go to line N
if (count === 1) {
ctx.setOffset(ctx.cursor.startOfLastLine().offset)
} else {
ctx.setOffset(ctx.cursor.goToLine(count).offset)
}
},
}
}
if (input === '.') {
return { execute: () => ctx.onDotRepeat?.() }
}
if (input === ';' || input === ',') {
return { execute: () => executeRepeatFind(input === ',', count, ctx) }
}
if (input === 'u') {
return { execute: () => ctx.onUndo?.() }
}
if (input === 'i') {
return { execute: () => ctx.enterInsert(ctx.cursor.offset) }
}
if (input === 'I') {
return {
execute: () =>
ctx.enterInsert(ctx.cursor.firstNonBlankInLogicalLine().offset),
}
}
if (input === 'a') {
return {
execute: () => {
const newOffset = ctx.cursor.isAtEnd()
? ctx.cursor.offset
: ctx.cursor.right().offset
ctx.enterInsert(newOffset)
},
}
}
if (input === 'A') {
return {
execute: () => ctx.enterInsert(ctx.cursor.endOfLogicalLine().offset),
}
}
if (input === 'o') {
return { execute: () => executeOpenLine('below', ctx) }
}
if (input === 'O') {
return { execute: () => executeOpenLine('above', ctx) }
}
return null
}
/**
* Handle operator input (motion, find, text object scope).
* Returns null if input is not recognized.
*/
function handleOperatorInput(
op: Operator,
count: number,
input: string,
ctx: TransitionContext,
): TransitionResult | null {
if (isTextObjScopeKey(input)) {
return {
next: {
type: 'operatorTextObj',
op,
count,
scope: TEXT_OBJ_SCOPES[input],
},
}
}
if (FIND_KEYS.has(input)) {
return {
next: { type: 'operatorFind', op, count, find: input as FindType },
}
}
if (SIMPLE_MOTIONS.has(input)) {
return { execute: () => executeOperatorMotion(op, input, count, ctx) }
}
if (input === 'G') {
return { execute: () => executeOperatorG(op, count, ctx) }
}
if (input === 'g') {
return { next: { type: 'operatorG', op, count } }
}
return null
}
// ============================================================================
// Transition Functions - One per state type
// ============================================================================
function fromIdle(input: string, ctx: TransitionContext): TransitionResult {
// 0 is line-start motion, not a count prefix
if (/[1-9]/.test(input)) {
return { next: { type: 'count', digits: input } }
}
if (input === '0') {
return {
execute: () => ctx.setOffset(ctx.cursor.startOfLogicalLine().offset),
}
}
const result = handleNormalInput(input, 1, ctx)
if (result) return result
return {}
}
function fromCount(
state: { type: 'count'; digits: string },
input: string,
ctx: TransitionContext,
): TransitionResult {
if (/[0-9]/.test(input)) {
const newDigits = state.digits + input
const count = Math.min(parseInt(newDigits, 10), MAX_VIM_COUNT)
return { next: { type: 'count', digits: String(count) } }
}
const count = parseInt(state.digits, 10)
const result = handleNormalInput(input, count, ctx)
if (result) return result
return { next: { type: 'idle' } }
}
function fromOperator(
state: { type: 'operator'; op: Operator; count: number },
input: string,
ctx: TransitionContext,
): TransitionResult {
// dd, cc, yy = line operation
if (input === state.op[0]) {
return { execute: () => executeLineOp(state.op, state.count, ctx) }
}
if (/[0-9]/.test(input)) {
return {
next: {
type: 'operatorCount',
op: state.op,
count: state.count,
digits: input,
},
}
}
const result = handleOperatorInput(state.op, state.count, input, ctx)
if (result) return result
return { next: { type: 'idle' } }
}
function fromOperatorCount(
state: {
type: 'operatorCount'
op: Operator
count: number
digits: string
},
input: string,
ctx: TransitionContext,
): TransitionResult {
if (/[0-9]/.test(input)) {
const newDigits = state.digits + input
const parsedDigits = Math.min(parseInt(newDigits, 10), MAX_VIM_COUNT)
return { next: { ...state, digits: String(parsedDigits) } }
}
const motionCount = parseInt(state.digits, 10)
const effectiveCount = state.count * motionCount
const result = handleOperatorInput(state.op, effectiveCount, input, ctx)
if (result) return result
return { next: { type: 'idle' } }
}
function fromOperatorFind(
state: {
type: 'operatorFind'
op: Operator
count: number
find: FindType
},
input: string,
ctx: TransitionContext,
): TransitionResult {
return {
execute: () =>
executeOperatorFind(state.op, state.find, input, state.count, ctx),
}
}
function fromOperatorTextObj(
state: {
type: 'operatorTextObj'
op: Operator
count: number
scope: TextObjScope
},
input: string,
ctx: TransitionContext,
): TransitionResult {
if (TEXT_OBJ_TYPES.has(input)) {
return {
execute: () =>
executeOperatorTextObj(state.op, state.scope, input, state.count, ctx),
}
}
return { next: { type: 'idle' } }
}
function fromFind(
state: { type: 'find'; find: FindType; count: number },
input: string,
ctx: TransitionContext,
): TransitionResult {
return {
execute: () => {
const result = ctx.cursor.findCharacter(input, state.find, state.count)
if (result !== null) {
ctx.setOffset(result)
ctx.setLastFind(state.find, input)
}
},
}
}
function fromG(
state: { type: 'g'; count: number },
input: string,
ctx: TransitionContext,
): TransitionResult {
if (input === 'j' || input === 'k') {
return {
execute: () => {
const target = resolveMotion(`g${input}`, ctx.cursor, state.count)
ctx.setOffset(target.offset)
},
}
}
if (input === 'g') {
// If count provided (e.g., 5gg), go to that line. Otherwise go to first line.
if (state.count > 1) {
return {
execute: () => {
const lines = ctx.text.split('\n')
const targetLine = Math.min(state.count - 1, lines.length - 1)
let offset = 0
for (let i = 0; i < targetLine; i++) {
offset += (lines[i]?.length ?? 0) + 1 // +1 for newline
}
ctx.setOffset(offset)
},
}
}
return {
execute: () => ctx.setOffset(ctx.cursor.startOfFirstLine().offset),
}
}
return { next: { type: 'idle' } }
}
function fromOperatorG(
state: { type: 'operatorG'; op: Operator; count: number },
input: string,
ctx: TransitionContext,
): TransitionResult {
if (input === 'j' || input === 'k') {
return {
execute: () =>
executeOperatorMotion(state.op, `g${input}`, state.count, ctx),
}
}
if (input === 'g') {
return { execute: () => executeOperatorGg(state.op, state.count, ctx) }
}
// Any other input cancels the operator
return { next: { type: 'idle' } }
}
function fromReplace(
state: { type: 'replace'; count: number },
input: string,
ctx: TransitionContext,
): TransitionResult {
// Backspace/Delete arrive as empty input in literal-char states. In vim,
// r<BS> cancels the replace; without this guard, executeReplace("") would
// delete the character under the cursor instead.
if (input === '') return { next: { type: 'idle' } }
return { execute: () => executeReplace(input, state.count, ctx) }
}
function fromIndent(
state: { type: 'indent'; dir: '>' | '<'; count: number },
input: string,
ctx: TransitionContext,
): TransitionResult {
if (input === state.dir) {
return { execute: () => executeIndent(state.dir, state.count, ctx) }
}
return { next: { type: 'idle' } }
}
// ============================================================================
// Helper functions for special commands
// ============================================================================
function executeRepeatFind(
reverse: boolean,
count: number,
ctx: TransitionContext,
): void {
const lastFind = ctx.getLastFind()
if (!lastFind) return
// Determine the effective find type based on reverse
let findType = lastFind.type
if (reverse) {
// Flip the direction
const flipMap: Record<FindType, FindType> = {
f: 'F',
F: 'f',
t: 'T',
T: 't',
}
findType = flipMap[findType]
}
const result = ctx.cursor.findCharacter(lastFind.char, findType, count)
if (result !== null) {
ctx.setOffset(result)
}
}