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import { makeError, parseList, skipSpaces } from './utils';
export const TType = Object.freeze({
color: { canInterpolate: true },
number: { canInterpolate: true },
string: { canInterpolate: false }
});
const _strEscapeRe = new RegExp('\\\\.', 'g');
/**
* @param {RegExpMatchArray} match
*/
function _strEscapeRepl(match) {
return match[1];
}
/**
* @param {ParseCtx} ctx
* @return {string}
*/
export function parseString(ctx) {
const value = ctx.value;
const delim = skipSpaces(ctx);
if (delim !== '"' && delim !== "'") {
throw new SyntaxError(makeError('failed to parse value: invalid string delimiter', ctx));
}
for (var i = ctx.index + 1; i < value.length; ++i) {
var c = value[i];
if (c === '\\') {
++i;
}
else if (c === delim) {
const ret = value.slice(ctx.index + 1, i)// @ts-ignore: not sure why
.replace(_strEscapeRe, _strEscapeRepl);
ctx.index = ++i;
return ret;
}
}
throw new SyntaxError(makeError('failed to parse unterminated string value', ctx));
}
/*
this expression does match corrupted things like "+" or the empty string,
but this will be checked by parseScalar
*/
const _scalarRe = new RegExp('^\\s*([+-]?\\d*(?:\\.\\d*)?)\\s*([A-Za-z]*|%)?');
/**
* @param {ParseCtx} ctx
* @return {number}
*/
export function parseScalar(ctx) {
var match = ctx.value.slice(ctx.index).match(_scalarRe);
Iif (!match) {
throw new SyntaxError(makeError('failed to parse scalar value', ctx));
}
var value = parseFloat(match[1]);
if (isNaN(value)) {
throw new SyntaxError(makeError('failed to parse scalar value', ctx));
}
if (match[2]) {
if (ctx.unit && (ctx.unit !== match[2])) {
throw new SyntaxError(makeError('mixed units in scalar list', ctx));
}
ctx.unit = match[2];
}
ctx.index += match[0].length;
return value;
}
/**
* @param {string} value
* @return {ssvg.$TRange|null} value
*/ // eslint-disable-next-line complexity
export function parseTRange(value) {
/** @type {ParseCtx} */
const ctx = { index: 0, value: value };
/** @type {any} */
var c = value ? skipSpaces(ctx) : null;
if (c === null) {
return null;
}
c = c.charCodeAt(0);
if ((c === 34) || (c === 39)) { /* " | ' */
return { type: 'string', values: parseList(ctx, parseString) };
}
else if ((c === 43) || (c === 45) || (c === 46) || ((c >= 48) && (c <= 57))) { /* +|-|.|[0-9] */
var values = parseList(ctx, parseScalar);
return (ctx.unit) ?
{ type: 'number', unit: ctx.unit, values: values } :
{ type: 'number', values: values };
}
else {
return { type: 'color', values: ctx.value.split(';').map((s) => s.trim()) };
}
}
/**
* @param {string} value
* @return {ssvg.$TValue|null}
*/
// eslint-disable-next-line complexity
export function parseTValue(value) {
/** @type {ParseCtx} */
const ctx = { index: 0, value: value };
/** @type {any} */
var c = value ? skipSpaces(ctx) : null;
if (c === null) {
return null;
}
c = c.charCodeAt(0);
if ((c === 34) || (c === 39)) { /* " | ' */
const str = parseString(ctx);
if (skipSpaces(ctx) !== null) {
throw new SyntaxError(makeError('invalid trailing characters in string', ctx));
}
return { type: 'string', value: str };
}
else if ((c === 43) || (c === 45) || (c === 46) || ((c >= 48) && (c <= 57))) { /* +|-|.|[0-9] */
const scalar = parseScalar(ctx);
if (skipSpaces(ctx) !== null) {
throw new SyntaxError(makeError('invalid trailing characters in scalar', ctx));
}
return (ctx.unit) ?
{ type: 'number', unit: ctx.unit, value: scalar } :
{ type: 'number', value: scalar };
}
else {
return { type: 'color', value: ctx.value };
}
}
/**
* @param {string} value
* @return {string|number|boolean|null}
*/
// eslint-disable-next-line complexity
export function parseInitial(value) {
/** @type {ParseCtx} */
const ctx = { index: 0, value: value };
/** @type {any} */
var c = value ? skipSpaces(ctx) : null;
if (c === null) {
return value;
}
c = c.charCodeAt(0);
if ((c === 34) || (c === 39)) { /* " | ' */
const str = parseString(ctx);
Iif (skipSpaces(ctx) !== null) {
throw new SyntaxError(makeError('invalid trailing characters in string', ctx));
}
return str;
}
else if ((c === 43) || (c === 45) || (c === 46) || ((c >= 48) && (c <= 57))) { /* +|-|.|[0-9] */
return parseFloat(ctx.value);
}
else {
const lvalue = value.toLowerCase();
if (lvalue === 'true') {
return true;
}
else if (lvalue === 'false') {
return false;
}
return value;
}
}
/**
* @param {ssvg.$TValue|null|undefined} from
* @param {ssvg.$TValue|null|undefined} to
* @return {ssvg.$TRange}
*/
export function makeRange(from, to) {
Iif (!from || !to) {
throw new SyntaxError('can create range with undefined values');
}
const ret = {
values: [ from.value, to.value ],
unit: from.unit,
type: from.type
};
if (to.unit) {
Iif (from.unit && (to.unit !== from.unit)) {
throw new SyntaxError(`from/to unit differs: ${from.unit} !== ${to.unit}`);
}
ret.unit = to.unit;
}
Iif (from.type !== to.type) {
throw new SyntaxError(`from/to type differs: ${from.type} !== ${to.type}`);
}
return ret;
}
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