@neo-one/smart-contract-compiler
Version:
NEO•ONE TypeScript smart contract compiler.
126 lines (124 loc) • 4.74 kB
JavaScript
import { Helper } from '../Helper';
export class BufferSliceHelper extends Helper {
constructor({ hasEnd = false }) {
super();
this.hasEnd = hasEnd;
}
emit(sb, node, options) {
if (!options.pushValue) {
sb.emitOp(node, 'DROP');
sb.emitOp(node, 'DROP');
return;
}
if (this.hasEnd) {
sb.emitOp(node, 'ROT');
sb.emitOp(node, 'SWAP');
sb.emitHelper(node, options, sb.helpers.if({
condition: () => {
sb.emitOp(node, 'TUCK');
sb.emitPushInt(node, 0);
sb.emitOp(node, 'LT');
},
whenTrue: () => {
sb.emitOp(node, 'TUCK');
sb.emitOp(node, 'SIZE');
sb.emitOp(node, 'ADD');
sb.emitOp(node, 'SWAP');
},
}));
sb.emitOp(node, 'ROT');
sb.emitHelper(node, options, sb.helpers.if({
condition: () => {
sb.emitOp(node, 'TUCK');
sb.emitPushInt(node, 0);
sb.emitOp(node, 'LT');
},
whenTrue: () => {
sb.emitOp(node, 'TUCK');
sb.emitOp(node, 'SIZE');
sb.emitOp(node, 'ADD');
sb.emitOp(node, 'SWAP');
},
}));
sb.emitOp(node, 'ROT');
sb.emitOp(node, 'ROT');
sb.emitHelper(node, options, sb.helpers.if({
condition: () => {
sb.emitOp(node, 'TUCK');
sb.emitOp(node, 'OVER');
sb.emitOp(node, 'LTE');
},
whenTrue: () => {
sb.emitOp(node, 'DROP');
sb.emitOp(node, 'DROP');
sb.emitOp(node, 'DROP');
sb.emitPushBuffer(node, Buffer.alloc(0, 0));
},
whenFalse: () => {
sb.emitOp(node, 'TUCK');
sb.emitOp(node, 'SUB');
sb.emitOp(node, 'ROT');
sb.emitOp(node, 'ROT');
sb.emitOp(node, 'OVER');
sb.emitOp(node, 'SIZE');
sb.emitOp(node, 'SWAP');
sb.emitOp(node, 'SUB');
sb.emitOp(node, 'RIGHT');
sb.emitOp(node, 'SWAP');
sb.emitOp(node, 'LEFT');
},
}));
}
else {
sb.emitHelper(node, options, sb.helpers.if({
condition: () => {
sb.emitOp(node, 'DUP');
sb.emitPushInt(node, 0);
sb.emitOp(node, 'LT');
},
whenTrue: () => {
sb.emitPushInt(node, -1);
sb.emitOp(node, 'MUL');
sb.emitHelper(node, options, sb.helpers.if({
condition: () => {
sb.emitOp(node, 'TUCK');
sb.emitOp(node, 'OVER');
sb.emitOp(node, 'SIZE');
sb.emitOp(node, 'GT');
},
whenTrue: () => {
sb.emitOp(node, 'NIP');
},
whenFalse: () => {
sb.emitOp(node, 'SWAP');
sb.emitOp(node, 'RIGHT');
},
}));
},
whenFalse: () => {
sb.emitOp(node, 'OVER');
sb.emitOp(node, 'SIZE');
sb.emitOp(node, 'SWAP');
sb.emitOp(node, 'SUB');
sb.emitHelper(node, options, sb.helpers.if({
condition: () => {
sb.emitOp(node, 'TUCK');
sb.emitPushInt(node, 0);
sb.emitOp(node, 'LTE');
},
whenTrue: () => {
sb.emitOp(node, 'DROP');
sb.emitOp(node, 'DROP');
sb.emitPushBuffer(node, Buffer.alloc(0, 0));
},
whenFalse: () => {
sb.emitOp(node, 'SWAP');
sb.emitOp(node, 'RIGHT');
},
}));
},
}));
}
}
}
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