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import * as ts from "typescript";
import * as lua from "../../LuaAST";
import { TransformationContext } from "../context";
import { unsupportedProperty } from "../utils/diagnostics";
import { addToNumericExpression, createNaN, getNumberLiteralValue } from "../utils/lua-ast";
import { LuaLibFeature, transformLuaLibFunction } from "../utils/lualib";
import { PropertyCallExpression, transformArguments } from "../visitors/call";
function createStringCall(methodName: string, tsOriginal: ts.Node, ...params: lua.Expression[]): lua.CallExpression {
const stringIdentifier = lua.createIdentifier("string");
return lua.createCallExpression(
lua.createTableIndexExpression(stringIdentifier, lua.createStringLiteral(methodName)),
params,
tsOriginal
);
}
export function transformStringPrototypeCall(
context: TransformationContext,
node: PropertyCallExpression
): lua.Expression | undefined {
const expression = node.expression;
const signature = context.checker.getResolvedSignature(node);
const params = transformArguments(context, node.arguments, signature);
const caller = context.transformExpression(expression.expression);
const expressionName = expression.name.text;
switch (expressionName) {
case "replace":
return transformLuaLibFunction(context, LuaLibFeature.StringReplace, node, caller, ...params);
case "concat":
return transformLuaLibFunction(context, LuaLibFeature.StringConcat, node, caller, ...params);
case "indexOf": {
const stringExpression = createStringCall(
"find",
node,
caller,
params[0],
params[1]
? // string.find handles negative indexes by making it relative to string end, but for indexOf it's the same as 0
lua.createCallExpression(
lua.createTableIndexExpression(lua.createIdentifier("math"), lua.createStringLiteral("max")),
[addToNumericExpression(params[1], 1), lua.createNumericLiteral(1)]
)
: lua.createNilLiteral(),
lua.createBooleanLiteral(true)
);
return lua.createBinaryExpression(
lua.createBinaryExpression(stringExpression, lua.createNumericLiteral(0), lua.SyntaxKind.OrOperator),
lua.createNumericLiteral(1),
lua.SyntaxKind.SubtractionOperator,
node
);
}
case "substr":
return transformLuaLibFunction(context, LuaLibFeature.StringSubstr, node, caller, ...params);
case "substring":
return transformLuaLibFunction(context, LuaLibFeature.StringSubstring, node, caller, ...params);
case "slice": {
const literalArg1 = getNumberLiteralValue(params[0]);
if (params[0] && literalArg1 !== undefined) {
let stringSubArgs: lua.Expression[] | undefined = [
addToNumericExpression(params[0], literalArg1 < 0 ? 0 : 1),
];
if (params[1]) {
const literalArg2 = getNumberLiteralValue(params[1]);
if (literalArg2 !== undefined) {
stringSubArgs.push(addToNumericExpression(params[1], literalArg2 < 0 ? -1 : 0));
} else {
stringSubArgs = undefined;
}
}
// Inline string.sub call if we know that both parameters are pure and aren't negative
if (stringSubArgs) {
return createStringCall("sub", node, caller, ...stringSubArgs);
}
}
return transformLuaLibFunction(context, LuaLibFeature.StringSlice, node, caller, ...params);
}
case "toLowerCase":
return createStringCall("lower", node, caller);
case "toUpperCase":
return createStringCall("upper", node, caller);
case "trim":
return transformLuaLibFunction(context, LuaLibFeature.StringTrim, node, caller);
case "trimEnd":
case "trimRight":
return transformLuaLibFunction(context, LuaLibFeature.StringTrimEnd, node, caller);
case "trimStart":
case "trimLeft":
return transformLuaLibFunction(context, LuaLibFeature.StringTrimStart, node, caller);
case "split":
return transformLuaLibFunction(context, LuaLibFeature.StringSplit, node, caller, ...params);
case "charAt": {
const literalValue = getNumberLiteralValue(params[0]);
// Inline string.sub call if we know that parameter is pure and isn't negative
if (literalValue !== undefined && literalValue >= 0) {
const firstParamPlusOne = addToNumericExpression(params[0], 1);
return createStringCall("sub", node, caller, firstParamPlusOne, firstParamPlusOne);
}
return transformLuaLibFunction(context, LuaLibFeature.StringCharAt, node, caller, ...params);
}
case "charCodeAt": {
const literalValue = getNumberLiteralValue(params[0]);
// Inline string.sub call if we know that parameter is pure and isn't negative
if (literalValue !== undefined && literalValue >= 0) {
return lua.createBinaryExpression(
createStringCall("byte", node, caller, addToNumericExpression(params[0], 1)),
createNaN(),
lua.SyntaxKind.OrOperator
);
}
return transformLuaLibFunction(context, LuaLibFeature.StringCharCodeAt, node, caller, ...params);
}
case "startsWith":
return transformLuaLibFunction(context, LuaLibFeature.StringStartsWith, node, caller, ...params);
case "endsWith":
return transformLuaLibFunction(context, LuaLibFeature.StringEndsWith, node, caller, ...params);
case "includes":
return transformLuaLibFunction(context, LuaLibFeature.StringIncludes, node, caller, ...params);
case "repeat":
const math = lua.createIdentifier("math");
const floor = lua.createStringLiteral("floor");
const parameter = lua.createCallExpression(lua.createTableIndexExpression(math, floor), [params[0]]);
return createStringCall("rep", node, caller, parameter);
case "padStart":
return transformLuaLibFunction(context, LuaLibFeature.StringPadStart, node, caller, ...params);
case "padEnd":
return transformLuaLibFunction(context, LuaLibFeature.StringPadEnd, node, caller, ...params);
default:
context.diagnostics.push(unsupportedProperty(expression.name, "string", expressionName));
}
}
export function transformStringConstructorCall(
context: TransformationContext,
node: PropertyCallExpression
): lua.Expression | undefined {
const expression = node.expression;
const signature = context.checker.getResolvedSignature(node);
const params = transformArguments(context, node.arguments, signature);
const expressionName = expression.name.text;
switch (expressionName) {
case "fromCharCode":
return lua.createCallExpression(
lua.createTableIndexExpression(lua.createIdentifier("string"), lua.createStringLiteral("char")),
params,
node
);
default:
context.diagnostics.push(unsupportedProperty(expression.name, "String", expressionName));
}
}
export function transformStringProperty(
context: TransformationContext,
node: ts.PropertyAccessExpression
): lua.UnaryExpression | undefined {
switch (node.name.text) {
case "length":
const expression = context.transformExpression(node.expression);
return lua.createUnaryExpression(expression, lua.SyntaxKind.LengthOperator, node);
default:
context.diagnostics.push(unsupportedProperty(node.name, "string", node.name.text));
}
}