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index.ts
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index.ts
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import {
PathCommand,
isValidCommandType,
isValidPathCommandParams,
PATH_COMMAND_COMMANDS,
} from '../PathCommand'
import { PathCommandList } from '../PathCommandList'
const splitCommand = (
commandString: string,
): { command: string; params: number[] } => {
if (commandString.length < 1)
throw new Error('command string must be at least 1 character')
return {
command: commandString[0],
params: parseCommandParams(commandString),
}
}
const parseCommandParams = (commandString: string): number[] => {
if (commandString.length <= 1) {
return []
}
const _paramString = commandString.slice(1, commandString.length)
const _params = _paramString
.replace(/-/g, ',-') // '10-10 20-20' => '10,-10 20,-20'
.split(/,|\s/g)
.filter((_param) => !!_param)
return _params.map((_param: string) => {
const paramValue = Number(_param)
if (isNaN(paramValue)) {
throw new Error(`Invalid command params: ${commandString}`)
}
return paramValue
})
}
export const parsePathCommandList = (
commandString: string,
): PathCommandList => {
const commands: PathCommand[] = []
const commandStringList = commandString.split(
new RegExp(`(?=${PATH_COMMAND_COMMANDS.join('|')})`, 'g'),
)
for (const commandStringItem of commandStringList) {
const { command, params } = splitCommand(commandStringItem.trim())
if (
!isValidCommandType(command) ||
!isValidPathCommandParams(command, params)
) {
throw new Error(`Invalid command string: ${commandStringItem.trim()}`)
}
commands.push(new PathCommand(command, params))
}
return new PathCommandList(commands)
}