Created
March 21, 2018 02:49
-
-
Save syuchan1005/c996ead6e1bd251a999bc90c406ab03e to your computer and use it in GitHub Desktop.
演算子指定可能なBrainfuckインタプリタ
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
class Brainfuck { | |
constructor() { | |
this.functions = { | |
incrementPointer: () => { | |
this.ptr += 1; | |
if (this.debug) this.write('>', this.ptr); | |
}, // '>' | |
decrementPointer: () => { | |
this.ptr -= 1; | |
if (this.ptr < 0) this.ptr = 0; | |
if (this.debug) this.write('<', this.ptr); | |
}, // '<' | |
incrementBytePointer: () => { | |
this.data[this.ptr] = this.data[this.ptr] || 0; | |
this.data[this.ptr] += 1; | |
if (this.debug) this.write('+', this.data[this.ptr], this.ptr); | |
}, // '+' | |
decrementBytePointer: () => { | |
this.data[this.ptr] = this.data[this.ptr] || 0; | |
this.data[this.ptr] -= 1; | |
if (this.debug) this.write('-', this.data[this.ptr], this.ptr); | |
}, // '-' | |
outputBytePointer: () => { | |
const c = String.fromCharCode(this.data[this.ptr]); | |
this.output.push(c); | |
if (this.debug) this.write('.', c, this.data[this.ptr]); | |
}, // '.' | |
inputBytePointer: () => { | |
const c = this.stdin.shift(); | |
if (typeof c === 'string') this.data[this.ptr] = c.charCodeAt(0); | |
if (this.debug) this.write(',', c, this.data[this.ptr]); | |
}, // ',' | |
jumpForward: '[', | |
jumpBackward: ']', | |
}; | |
} | |
parse(source, stdin, ops, debug, debugWrite) { | |
if (!source) return ''; | |
this.source = source; | |
this.stdin = stdin.split('').filter(v => v.length !== 0); | |
const op = Object.assign({ | |
incrementPointer: '>', | |
decrementPointer: '<', | |
incrementBytePointer: '+', | |
decrementBytePointer: '-', | |
outputBytePointer: '.', | |
inputBytePointer: ',', | |
jumpForward: '[', | |
jumpBackward: ']', | |
}, ops); | |
this.operators = {}; | |
Object.keys(op).forEach((key) => { this.operators[op[key]] = key; }); | |
this.jumpForward = op.jumpForward; | |
this.jumpBackward = op.jumpBackward; | |
this.debug = Boolean(debug); | |
this.write = debugWrite || console.log; /* eslint-disable-line no-console */ | |
this.output = []; | |
this.data = []; | |
this.ptr = 0; | |
const nodes = this.parseProgram(); | |
nodes.forEach((node) => { node(); }); | |
return this.output.join(''); | |
} | |
parseProgram() { | |
const nodes = []; | |
while (this.source.length > 0) { | |
Object.keys(this.operators).some((operator) => { | |
if (this.source.startsWith(operator)) { | |
const func = this.functions[this.operators[operator]]; | |
this.source = this.source.substr(operator.length); | |
if (typeof func === 'string') { | |
if (func === '[') { | |
nodes.push(this.parseLoop()); | |
} else { | |
throw new Error('Missing opening function'); | |
} | |
} else { | |
nodes.push(func); | |
} | |
return true; | |
} | |
return false; | |
}); | |
} | |
return nodes; | |
} | |
parseLoop() { | |
const nodes = []; | |
while (!this.source.startsWith(this.jumpBackward)) { | |
Object.keys(this.operators).some((operator) => { | |
if (this.source.startsWith(operator)) { | |
const func = this.functions[this.operators[operator]]; | |
this.source = this.source.substr(operator.length); | |
if (typeof func === 'string' && func === '[') { | |
nodes.push(this.parseLoop()); | |
} else { | |
nodes.push(func); | |
} | |
return true; | |
} | |
return false; | |
}); | |
} | |
this.source = this.source.substr(this.jumpBackward.length); | |
return () => { | |
let loopCounter = 0; | |
while (this.data[this.ptr] > 0) { | |
loopCounter += 1; | |
if (loopCounter > 10000) throw new Error('Infinite loop detected'); | |
nodes.forEach((node) => { node(); }); | |
} | |
}; | |
} | |
} | |
export default Brainfuck; |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment