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* `java.lang.String` method invocation.
*
* SpEL resolves a method call on a string against `java.lang.String`, so the
* behaviour that matters is Java's, not JavaScript's. Several method names are
* shared by the two languages with **different semantics**, and a JavaScript
* implementation winning the lookup produces a plausible wrong answer rather
* than an error:
*
* - `replaceAll(regex, replacement)` takes a regular expression in Java. The
* JavaScript `String.prototype.replaceAll` takes a *string*, so
* `'a1b2'.replaceAll('\\d', '-')` returned the input unchanged.
* - `replace(target, replacement)` replaces **every** occurrence in Java. The
* JavaScript version replaces only the first.
* - `split(regex)` takes a regular expression in Java and discards trailing
* empty strings; the JavaScript version treats the argument as a literal.
* - `charAt` and `substring` throw for an out-of-range index in Java, where the
* JavaScript fallback silently clamped or returned an empty string.
*
* Because of that, a string target is resolved against this table only. Names
* that JavaScript has and Java does not, such as `includes`, are therefore not
* callable, which matches Spring, where they would be a method-not-found error.
*/
import { TypedValue } from '../typed-value.js';
import { SpelEvaluationException } from '../error/spel-evaluation-exception.js';
import { SpelMessage } from '../error/spel-message.js';
/** Position used when the caller does not know it; the AST node fills it in. */
const UNKNOWN_POSITION = -1;
/**
* Invoke a `java.lang.String` method, or return null when the name is not one.
*/
export function invokeStringMethod(
source: string,
name: string,
args: readonly unknown[],
position: number = UNKNOWN_POSITION,
): TypedValue | null {
switch (name) {
case 'length':
return new TypedValue(source.length);
case 'isEmpty':
return new TypedValue(source.length === 0);
case 'isBlank':
return new TypedValue(source.trim().length === 0);
case 'toString':
return new TypedValue(source);
case 'charAt':
return new TypedValue(charAt(source, args, position));
case 'substring':
return new TypedValue(substring(source, args, position));
case 'contains':
return new TypedValue(source.includes(requireString(args[0], name, position)));
case 'startsWith':
return new TypedValue(source.startsWith(requireString(args[0], name, position)));
case 'endsWith':
return new TypedValue(source.endsWith(requireString(args[0], name, position)));
case 'indexOf':
return new TypedValue(indexOf(source, args, position));
case 'lastIndexOf':
return new TypedValue(lastIndexOf(source, args, position));
case 'toLowerCase':
return new TypedValue(source.toLowerCase());
case 'toUpperCase':
return new TypedValue(source.toUpperCase());
case 'trim':
case 'strip':
return new TypedValue(source.trim());
case 'concat':
return new TypedValue(source + requireString(args[0], name, position));
case 'equals':
return new TypedValue(source === requireString(args[0], name, position));
case 'equalsIgnoreCase':
return new TypedValue(
source.toLowerCase() === requireString(args[0], name, position).toLowerCase(),
);
case 'compareTo':
return new TypedValue(compareTo(source, requireString(args[0], name, position)));
case 'compareToIgnoreCase':
return new TypedValue(
compareTo(source.toLowerCase(), requireString(args[0], name, position).toLowerCase()),
);
case 'matches':
return new TypedValue(matchesWhole(source, requireString(args[0], name, position), position));
case 'replace':
return new TypedValue(
replaceLiteral(
source,
requireString(args[0], name, position),
requireString(args[1], name, position),
),
);
case 'replaceAll':
return new TypedValue(
replacePattern(
source,
requireString(args[0], name, position),
requireString(args[1], name, position),
position,
true,
),
);
case 'replaceFirst':
return new TypedValue(
replacePattern(
source,
requireString(args[0], name, position),
requireString(args[1], name, position),
position,
false,
),
);
case 'split':
return new TypedValue(splitPattern(source, args, position));
default:
return null;
}
}
function requireString(value: unknown, method: string, position: number): string {
if (typeof value === 'string') {
return value;
}
throw new SpelEvaluationException(position, SpelMessage.TYPE_CONVERSION_ERROR, method, 'String');
}
function requireInt(value: unknown, method: string, position: number): number {
if (typeof value === 'number' && Number.isInteger(value)) {
return value;
}
throw new SpelEvaluationException(position, SpelMessage.TYPE_CONVERSION_ERROR, method, 'int');
}
/** Java throws for an index outside the string; it does not clamp. */
function charAt(source: string, args: readonly unknown[], position: number): string {
const index = requireInt(args[0], 'charAt', position);
if (index < 0 || index >= source.length) {
throw new SpelEvaluationException(position, SpelMessage.INDEX_OUT_OF_BOUNDS);
}
return source.charAt(index);
}
/** Java rejects a begin index below zero, an end index past the end, or begin > end. */
function substring(source: string, args: readonly unknown[], position: number): string {
const begin = requireInt(args[0], 'substring', position);
const end = args.length > 1 ? requireInt(args[1], 'substring', position) : source.length;
if (begin < 0 || end > source.length || begin > end) {
throw new SpelEvaluationException(position, SpelMessage.INDEX_OUT_OF_BOUNDS);
}
return source.substring(begin, end);
}
function indexOf(source: string, args: readonly unknown[], position: number): number {
const search = requireString(args[0], 'indexOf', position);
if (args.length === 1) {
return source.indexOf(search);
}
const from = Math.max(0, Math.min(requireInt(args[1], 'indexOf', position), source.length));
return source.indexOf(search, from);
}
function lastIndexOf(source: string, args: readonly unknown[], position: number): number {
const search = requireString(args[0], 'lastIndexOf', position);
if (args.length === 1) {
return source.lastIndexOf(search);
}
return source.lastIndexOf(search, requireInt(args[1], 'lastIndexOf', position));
}
/**
* Java's `String.compareTo`: the difference of the first differing character
* codes, or the difference in length when one string is a prefix of the other.
*/
function compareTo(left: string, right: string): number {
const shared = Math.min(left.length, right.length);
for (let index = 0; index < shared; index += 1) {
const difference = left.charCodeAt(index) - right.charCodeAt(index);
if (difference !== 0) {
return difference;
}
}
return left.length - right.length;
}
function compilePattern(pattern: string, flags: string, position: number): RegExp {
try {
return new RegExp(pattern, flags);
} catch {
throw new SpelEvaluationException(position, SpelMessage.FLAWED_PATTERN, pattern);
}
}
/** `String.matches` requires the whole input to match, so the pattern is anchored. */
function matchesWhole(source: string, pattern: string, position: number): boolean {
return compilePattern(`^(?:${pattern})$`, '', position).test(source);
}
/** `String.replace` replaces every occurrence, and treats the target literally. */
function replaceLiteral(source: string, target: string, replacement: string): string {
if (target === '') {
// Java inserts the replacement at both ends and between every character.
// Iterating by code unit matches Java's `char`-based view of a String and
// avoids the spread operator, which would decompose by code point.
let widened = replacement;
for (let index = 0; index < source.length; index += 1) {
widened += source.charAt(index) + replacement;
}
return widened;
}
return source.split(target).join(replacement);
}
function replacePattern(
source: string,
pattern: string,
replacement: string,
position: number,
all: boolean,
): string {
return source.replace(compilePattern(pattern, all ? 'g' : '', position), replacement);
}
/**
* `String.split`. The argument is a regular expression, trailing empty strings
* are discarded unless a negative limit is given, and a positive limit bounds
* the number of applications of the pattern.
*/
function splitPattern(source: string, args: readonly unknown[], position: number): string[] {
const pattern = requireString(args[0], 'split', position);
const limit = args.length > 1 ? requireInt(args[1], 'split', position) : undefined;
// Java returns the input unchanged, as a single element, when it is empty.
if (source === '') {
return [''];
}
const regex = compilePattern(pattern, 'g', position);
if (limit !== undefined && limit > 0) {
return splitWithLimit(source, regex, limit);
}
const parts = source.split(regex);
// A negative limit keeps every element. A zero limit behaves like no limit,
// and both discard trailing empty strings.
if (limit !== undefined && limit < 0) {
return parts;
}
let end = parts.length;
while (end > 1 && parts[end - 1] === '') {
end -= 1;
}
return parts.slice(0, end);
}
function splitWithLimit(source: string, regex: RegExp, limit: number): string[] {
const parts: string[] = [];
let start = 0;
let match = regex.exec(source);
while (match !== null && parts.length < limit - 1) {
if (start === 0 && match.index === 0 && match[0].length === 0) {
// Java does not include a leading empty element for a zero-width match at
// the very start of the input, so `split('')` does not begin with ''.
regex.lastIndex += 1;
match = regex.exec(source);
continue;
}
parts.push(source.slice(start, match.index));
start = match.index + match[0].length;
if (match[0].length === 0) {
// A zero-width match does not advance lastIndex, so step over it.
regex.lastIndex += 1;
}
match = regex.exec(source);
}
// The final element holds everything not yet consumed.
parts.push(source.slice(start));
return parts;
}
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