openethereum/js/src/util/abi.js

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// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
import { range } from 'lodash';
const ARRAY_TYPE = 'ARRAY_TYPE';
const ADDRESS_TYPE = 'ADDRESS_TYPE';
const STRING_TYPE = 'STRING_TYPE';
const BOOL_TYPE = 'BOOL_TYPE';
const BYTES_TYPE = 'BYTES_TYPE';
const INT_TYPE = 'INT_TYPE';
const FIXED_TYPE = 'FIXED_TYPE';
export const ABI_TYPES = {
ARRAY: ARRAY_TYPE, ADDRESS: ADDRESS_TYPE,
STRING: STRING_TYPE, BOOL: BOOL_TYPE,
BYTES: BYTES_TYPE, INT: INT_TYPE,
FIXED: FIXED_TYPE
};
export function parseAbiType (type) {
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const arrayRegex = /^(.+)\[(\d*)]$/;
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if (arrayRegex.test(type)) {
const matches = arrayRegex.exec(type);
const subtype = parseAbiType(matches[1]);
const M = parseInt(matches[2]) || null;
const defaultValue = !M
? []
: range(M).map(() => subtype.default);
return {
type: ARRAY_TYPE,
subtype: subtype,
length: M,
default: defaultValue
};
}
const lengthRegex = /^(u?int|bytes)(\d{1,3})$/;
if (lengthRegex.test(type)) {
const matches = lengthRegex.exec(type);
const subtype = parseAbiType(matches[1]);
const length = parseInt(matches[2]);
return {
...subtype,
length
};
}
const fixedLengthRegex = /^(u?fixed)(\d{1,3})x(\d{1,3})$/;
if (fixedLengthRegex.test(type)) {
const matches = fixedLengthRegex.exec(type);
const subtype = parseAbiType(matches[1]);
const M = parseInt(matches[2]);
const N = parseInt(matches[3]);
return {
...subtype,
M, N
};
}
if (type === 'string') {
return {
type: STRING_TYPE,
default: ''
};
}
if (type === 'bool') {
return {
type: BOOL_TYPE,
default: false
};
}
if (type === 'address') {
return {
type: ADDRESS_TYPE,
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default: ''
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};
}
if (type === 'bytes') {
return {
type: BYTES_TYPE,
default: '0x'
};
}
if (type === 'uint') {
return {
type: INT_TYPE,
default: 0,
length: 256,
signed: false
};
}
if (type === 'int') {
return {
type: INT_TYPE,
default: 0,
length: 256,
signed: true
};
}
if (type === 'ufixed') {
return {
type: FIXED_TYPE,
default: 0,
length: 256,
signed: false
};
}
if (type === 'fixed') {
return {
type: FIXED_TYPE,
default: 0,
length: 256,
signed: true
};
}
}