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| // Node Types
import { extendNode } from '../../utils/extend-node';
import Syntax from 'walt-syntax';
import { nonEmpty, drop } from './helpers';
const marker = lexer => {
const { col, line } = lexer;
if (!lexer.lines.length) {
return { col, line, sourceLine: '' };
}
return {
col,
line,
sourceLine: lexer.lines[lexer.line - 1],
};
};
export default function factory(lexer) {
const node = (Type, seed = {}) => d => {
const params = d.filter(nonEmpty);
const { value = '', meta = {} } = seed;
const start = marker(lexer);
const end =
params[params.length - 1] && params[params.length - 1].range
? params[params.length - 1].range[1]
: { ...start, col: start.col + value.length };
return {
value,
type: null,
Type,
toString() {},
meta,
range: [start, end],
params,
};
};
const binary = d => {
const [lhs, operator, rhs] = d.filter(nonEmpty);
let Type = Syntax.BinaryExpression;
if (operator.value === '||' || operator.value === '&&') {
Type = Syntax.Select;
}
return node(Type, { value: operator.value })([lhs, rhs]);
};
const constant = d => {
const value = d[0].value;
return extendNode(
{
value: `${value}`,
type: value.toString().indexOf('.') !== -1 ? 'f32' : 'i32',
},
node(Syntax.Constant)([])
);
};
const identifier = d => node('Identifier', { value: d.join('') })([]);
const declaration = Type => d => {
const [pair, ...init] = drop(d);
const [id, type] = pair.params;
return extendNode(
{
value: id.value,
type: type.value,
},
node(Type)(init)
);
};
const unary = ([operator, target]) => {
let params = [target];
if (operator.value === '-') {
params = [
{
...target,
value: '0',
Type: Syntax.Constant,
params: [],
meta: {},
},
target,
];
}
return extendNode(
{
value: operator.value,
params,
},
node(Syntax.UnaryExpression)([operator, target])
);
};
const ternary = d => {
return extendNode(
{
value: '?',
},
node(Syntax.TernaryExpression)(d)
);
};
const subscript = d => {
const [id, field] = d.filter(nonEmpty);
return extendNode(
{
value: id.value,
params: [id, field],
},
node(Syntax.ArraySubscript)([id, field])
);
};
const fun = d => {
const [name, args, result, block] = d.filter(nonEmpty);
return {
...name,
Type: Syntax.FunctionDeclaration,
meta: [],
params: [args, result, block],
};
};
const voidFun = d => {
const params = drop(d);
const [name, args, block] = params;
const result = extendNode({ type: null }, node(Syntax.FunctionResult)([]));
return extendNode(
{
value: name.value,
params: [args, result, block],
},
node(Syntax.FunctionDeclaration)(params)
);
};
const result = d => {
const [type] = drop(d);
return extendNode(
{
type: type != null && type.value !== 'void' ? type.value : null,
},
node(Syntax.FunctionResult)(d)
);
};
const call = d => {
let [id, ...params] = drop(d);
return extendNode(
{
value: id.value,
},
node(Syntax.FunctionCall)([id, ...params])
);
};
const struct = d => {
const [id, ...params] = drop(d);
return extendNode(
{
value: id.value,
},
node(Syntax.Struct)(params)
);
};
const typedef = d => {
const [id, args, res] = drop(d);
return extendNode(
{
value: id.value,
params: [
node(Syntax.FunctionArguments)(args),
extendNode(
{
type: res.value,
},
node(Syntax.FunctionResult)([res])
),
],
type: res.type,
},
node(Syntax.Typedef)([id, args, result])
);
};
const string = d => {
return extendNode(
{
value: d[0].value,
type: 'i32',
},
node(Syntax.StringLiteral)([])
);
};
return {
node,
binary,
constant,
identifier,
unary,
ternary,
subscript,
access(d) {
return extendNode(
{
value: d[0].value + '.' + d[1].value,
},
node(Syntax.Access)(d)
);
},
fun,
declaration,
call,
struct,
result,
string,
char(d) {
return extendNode(
{
value: d[0].value,
type: 'i32',
},
node(Syntax.CharacterLiteral)([])
);
},
type(d) {
return extendNode(
{
value: d[0].value,
type: d[0].value,
params: [],
},
node(Syntax.Type)(d)
);
},
typeGeneric(d) {
const [id, obj] = drop(d);
return extendNode(
{
value: id.value,
type: id.value,
params: [obj],
},
node(Syntax.Type)(d)
);
},
typedef,
voidFun,
assignment(d, value) {
if (['-=', '+='].includes(value)) {
const operator = value[0];
const [target, amount] = drop(d);
const b = binary([target, { value: operator }, amount]);
return node(Syntax.Assignment, {
value: '=',
})([target, b]);
}
return node(Syntax.Assignment, { value })(d);
},
assignmentExpr(d, value) {
if (['-=', '+='].includes(value)) {
const operator = value[0];
const [target, amount] = drop(d);
const b = binary([target, { value: operator }, amount]);
return node(Syntax.AssignmentExpression, {
value: '=',
})([target, b]);
}
return node(Syntax.AssignmentExpression, { value })(d);
},
forLoop(d) {
const [initializer, condition, afterthought, ...body] = drop(d);
return node(Syntax.Loop)([initializer, condition, ...body, afterthought]);
},
whileLoop(d) {
const noop = node(Syntax.Noop)([]);
return node(Syntax.Loop)([noop, ...d]);
},
spread(d) {
return node(Syntax.Spread)(d);
},
builtinDecl(d) {
const [id, typeNode] = drop(d);
return extendNode(
{
value: id.value,
type: typeNode.value,
params: [typeNode],
},
node(Syntax.ImmutableDeclaration)(d)
);
},
addressOf(d) {
const [id] = drop(d);
return extendNode(
{
value: id.value,
params: [],
},
node('AddressOf')(d)
);
},
};
}
|