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Copy pathprinter.js
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771 lines (694 loc) · 19.3 KB
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"use strict";
const {
concat,
join,
line,
lineSuffix,
lineSuffixBoundary,
group,
conditionalGroup,
indent,
dedent,
ifBreak,
hardline,
softline,
breakParent,
} = require("prettier").doc.builders;
const { willBreak } = require("prettier").doc.utils;
const { makeString, isNextLineEmpty } = require("prettier").util;
const { isValidIdentifier, isExpression } = require("./util");
const { printDanglingComments, isDanglingComment } = require("./comments");
function printNoParens(path, options, print) {
const node = path.getValue();
switch (node.type) {
case "Chunk": {
return printBody(path, options, print);
}
case "AssignmentStatement":
case "LocalStatement": {
return concat([
group(
concat([
node.type === "LocalStatement" ? "local " : "",
indent(join(concat([",", line]), path.map(print, "variables"))),
line,
])
),
(() => {
if (node.init.length === 1) {
const init0Printed = path.call(print, "init", 0);
return concat([
"=",
group(
node.init.length === 1 && willBreak(init0Printed)
? concat([" ", init0Printed])
: indent(concat([line, init0Printed]))
),
]);
} else if (node.init.length > 1) {
return concat([
"=",
group(
indent(
concat([
line,
join(concat([",", line]), path.map(print, "init")),
])
)
),
]);
} else {
return "";
}
})(),
]);
}
case "Identifier": {
return node.name;
}
case "FunctionDeclaration": {
const isEmpty =
node.body.length === 0 &&
(!node.comments || node.comments.length === 0);
const isAnonymous = !node.identifier;
const hasParams = node.parameters.length > 0;
return concat([
node.isLocal ? "local " : "",
"function",
isAnonymous ? "" : concat([" ", path.call(print, "identifier")]),
"(",
hasParams
? group(
concat([
softline,
indent(
join(concat([",", line]), path.map(print, "parameters"))
),
softline,
])
)
: "",
")",
printIndentedBody(path, options, print),
isAnonymous && isEmpty ? " " : hardline,
"end",
]);
}
case "CallStatement": {
return path.call(print, "expression");
}
case "CallExpression": {
return concat([
path.call(print, "base"),
printArgumentsList(path, options, print),
]);
}
case "StringCallExpression": {
return concat([path.call(print, "base"), path.call(print, "argument")]);
}
case "TableCallExpression": {
return concat([path.call(print, "base"), path.call(print, "arguments")]);
}
case "BooleanLiteral":
case "NilLiteral":
case "NumericLiteral":
case "VarargLiteral": {
return node.raw;
}
case "StringLiteral": {
if (node.raw[0] === "[") {
return node.raw;
} else {
return printString(node.raw, options);
}
}
case "MemberExpression": {
return concat([
path.call(print, "base"),
node.indexer,
path.call(print, "identifier"),
]);
}
case "IndexExpression": {
return concat([
path.call(print, "base"),
"[",
path.call(print, "index"),
"]",
]);
}
case "TableConstructorExpression": {
if (node.fields.length === 0) {
return "{}";
}
const multiline = concat([
"{",
indent(
concat([
hardline,
join(concat([",", hardline]), path.map(print, "fields")),
options.trailingComma === "none" ? "" : ",",
])
),
hardline,
"}",
]);
const singleline = concat([
"{",
options.bracketSpacing ? " " : "",
join(", ", path.map(print, "fields")),
options.bracketSpacing ? " " : "",
"}",
]);
if (
// Table with only one value with no nested tables
(node.fields.length === 1 &&
node.fields[0].value.type !== "TableConstructorExpression") ||
// Array-like table
node.fields.every((field) => field.type === "TableValue")
) {
return conditionalGroup([singleline, multiline]);
} else {
return multiline;
}
}
case "TableValue": {
return path.call(print, "value");
}
case "TableKeyString": {
return concat([
path.call(print, "key"),
" = ",
path.call(print, "value"),
]);
}
case "TableKey": {
if (
node.key.type === "StringLiteral" &&
isValidIdentifier(node.key.value)
) {
// convert to TableKeyString
return concat([node.key.value, " = ", path.call(print, "value")]);
} else {
const isBlockString =
node.key.type === "StringLiteral" && node.key.raw[0] === "[";
return concat([
isBlockString ? "[ " : "[",
path.call(print, "key"),
isBlockString ? " ]" : "]",
" = ",
path.call(print, "value"),
]);
}
}
case "LogicalExpression":
case "BinaryExpression": {
return concat([
path.call(print, "left"),
" ",
node.operator,
" ",
path.call(print, "right"),
]);
}
case "IfStatement": {
const printedClauses = join(softline, path.map(print, "clauses"));
return concat([
printedClauses,
willBreak(printedClauses) ? hardline : " ",
"end",
]);
}
case "IfClause":
case "ElseifClause": {
const printedBody = printIndentedBody(path, options, print);
return concat([
node.type === "ElseifClause" ? "else" : "",
"if ",
path.call(print, "condition"),
" then",
willBreak(printedBody) ? breakParent : " ",
printedBody,
]);
}
case "ElseClause": {
return concat(["else ", printIndentedBody(path, options, print)]);
}
case "ReturnStatement": {
return concat([
"return",
node.arguments.length === 0 ? "" : " ",
join(", ", path.map(print, "arguments")),
]);
}
case "UnaryExpression": {
return concat([
node.operator,
node.operator.match(/^[a-zA-Z]+$/) ? " " : "",
path.call(print, "argument"),
]);
}
case "ForGenericStatement": {
return concat([
"for",
group(
concat([
indent(
concat([
line,
join(concat([",", line]), path.map(print, "variables")),
])
),
line,
])
),
"in",
group(
concat([
indent(
concat([
line,
join(concat([",", line]), path.map(print, "iterators")),
])
),
line,
])
),
"do",
printIndentedBody(path, options, print),
hardline,
"end",
]);
}
case "ForNumericStatement": {
return concat([
"for ",
path.call(print, "variable"),
" = ",
path.call(print, "start"),
", ",
path.call(print, "end"),
node.step ? ", " : "",
node.step ? path.call(print, "step") : "",
" do",
printIndentedBody(path, options, print),
hardline,
"end",
]);
}
case "DoStatement": {
return concat([
"do",
printIndentedBody(path, options, print),
hardline,
"end",
]);
}
case "WhileStatement": {
return concat([
"while ",
path.call(print, "condition"),
" do",
printIndentedBody(path, options, print),
hardline,
"end",
]);
}
case "RepeatStatement": {
return concat([
"repeat",
printIndentedBody(path, options, print),
hardline,
"until ",
path.call(print, "condition"),
]);
}
case "BreakStatement": {
return "break";
}
case "LabelStatement": {
return concat(["::", path.call(print, "label"), "::"]);
}
case "GotoStatement": {
return concat(["goto ", path.call(print, "label")]);
}
}
return "";
}
function printIndentedBody(path, options, print) {
const node = path.getValue();
const hasContent =
node.body.length > 0 ||
(node.comments && node.comments.filter(isDanglingComment).length > 0);
const isSimpleReturn =
node.type === "IfClause" &&
node.body.length === 1 &&
node.body[0].type === "ReturnStatement" &&
(node.body[0].comments == null || node.body[0].comments.length === 0) &&
node.body[0].arguments.length === 0;
if (isSimpleReturn) {
return printBody(path, options, print);
} else {
return hasContent
? indent(concat([hardline, printBody(path, options, print)]))
: "";
}
}
function printBody(path, options, print) {
const node = path.getValue();
const printed = [];
path.map((statementPath, index) => {
const statement = statementPath.getValue();
// Just in case the AST has been modified to contain falsy
// "statements," it's safer simply to skip them.
/* istanbul ignore if */
if (!statement) {
return;
}
const statementPrinted = print(statementPath);
const text = options.originalText;
const parts = [];
parts.push(statementPrinted);
const nextStatement = node.body[index + 1];
if (
nextStatement &&
couldBeCallExpressionBase(getRightmostNode(statement, node)) &&
willHaveLeadingParen(nextStatement, node)
) {
parts.push(";");
}
if (
isNextLineEmpty(text, statement, options["locEnd"]) &&
!isLastStatement(statementPath)
) {
parts.push(hardline);
}
printed.push(concat(parts));
}, "body");
return group(
concat([
join(hardline, printed),
printDanglingComments(path, options, /* sameIndent */ true),
])
);
}
function couldBeCallExpressionBase(node) {
if (node.type === "Identifier") {
return true;
}
if (isExpression(node) && node.inParens) {
return true;
}
if (
node.type === "CallStatement" &&
node.expression.type === "CallExpression"
) {
return true;
}
return false;
}
function shouldHaveParens(node, parent) {
if (!node.inParens) {
return false;
}
switch (node.type) {
case "Identifier":
case "IndexExpression":
case "MemberExpression": {
return false;
}
case "CallExpression":
case "VarargLiteral":
case "TableCallExpression":
case "StringCallExpression": {
if (parent.type === "TableValue") {
return true;
} else if (parent.type === "ReturnStatement") {
return !(parent.arguments.indexOf(node) < parent.arguments.length - 1);
} else if (
parent.type === "LocalStatement" ||
parent.type === "AssignmentStatement"
) {
if (parent.variables.length <= parent.init.length) {
return false;
}
return !(parent.init.indexOf(node) < parent.init.length - 1);
}
return false;
}
case "BooleanLiteral":
case "NilLiteral":
case "NumericLiteral":
case "StringLiteral":
case "TableConstructorExpression":
case "UnaryExpression":
case "FunctionDeclaration": {
return (
(parent.type === "CallExpression" ||
parent.type === "MemberExpression" ||
parent.type === "IndexExpression" ||
parent.type === "TableCallExpression" ||
parent.type === "StringCallExpression") &&
parent.base === node
);
}
case "BinaryExpression":
case "LogicalExpression": {
// Don't mess with parens in binary or logical expressions because
// people don't have math/operator precedences memorized, so adding
// parens helps make the code more readable.
return true;
}
}
return true;
}
function willHaveLeadingParen(node, parent) {
if (shouldHaveParens(node, parent)) {
return true;
}
if (node.type === "CallStatement") {
return willHaveLeadingParen(node.expression.base, node.expression);
} else if (
node.type === "MemberExpression" ||
node.type === "IndexExpression"
) {
return willHaveLeadingParen(node.base, node);
}
return false;
}
function getRightmostNode(node, parent) {
if (node == null) {
debugger;
}
switch (node.type) {
case "LocalStatement":
case "AssignmentStatement": {
if (node.init.length > 0) {
return getRightmostNode(node.init[node.init.length - 1], node);
} else {
return node;
}
}
case "BinaryExpression":
case "LogicalExpression": {
if (shouldHaveParens(node, parent)) {
return node;
}
return getRightmostNode(node.right, node);
}
}
return node;
}
function isLastStatement(path) {
const parent = path.getParentNode();
if (!parent) {
return true;
}
const node = path.getValue();
const body = parent.body;
return body && body[body.length - 1] === node;
}
function printString(raw, options) {
// `rawContent` is the string exactly like it appeared in the input source
// code, without its enclosing quotes.
const rawContent = raw.slice(1, -1);
const double = { quote: '"', regex: /"/g };
const single = { quote: "'", regex: /'/g };
const preferred = options.singleQuote ? single : double;
const alternate = preferred === single ? double : single;
let shouldUseAlternateQuote = false;
// If `rawContent` contains at least one of the quote preferred for enclosing
// the string, we might want to enclose with the alternate quote instead, to
// minimize the number of escaped quotes.
// Also check for the alternate quote, to determine if we're allowed to swap
// the quotes on a DirectiveLiteral.
if (
rawContent.includes(preferred.quote) ||
rawContent.includes(alternate.quote)
) {
const numPreferredQuotes = (rawContent.match(preferred.regex) || []).length;
const numAlternateQuotes = (rawContent.match(alternate.regex) || []).length;
shouldUseAlternateQuote = numPreferredQuotes > numAlternateQuotes;
}
const enclosingQuote = shouldUseAlternateQuote
? alternate.quote
: preferred.quote;
// It might sound unnecessary to use `makeString` even if the string already
// is enclosed with `enclosingQuote`, but it isn't. The string could contain
// unnecessary escapes (such as in `"\'"`). Always using `makeString` makes
// sure that we consistently output the minimum amount of escaped quotes.
return makeString(rawContent, enclosingQuote, false);
}
function printArgumentsList(path, options, print) {
const args = path.getValue().arguments;
if (args.length === 0) {
return "()";
}
let anyArgEmptyLine = false;
let hasEmptyLineFollowingFirstArg = false;
const lastArgIndex = args.length - 1;
const printedArguments = path.map((argPath, index) => {
const arg = argPath.getNode();
const parts = [print(argPath)];
if (index === lastArgIndex) {
// do nothing
} else if (isNextLineEmpty(options.originalText, arg, options["locEnd"])) {
if (index === 0) {
hasEmptyLineFollowingFirstArg = true;
}
anyArgEmptyLine = true;
parts.push(",", hardline, hardline);
} else {
parts.push(",", line);
}
return concat(parts);
}, "arguments");
const shouldGroupFirst = shouldGroupFirstArg(args);
const shouldGroupLast = shouldGroupLastArg(args);
if (shouldGroupFirst || shouldGroupLast) {
const shouldBreak =
(shouldGroupFirst
? printedArguments.slice(1).some(willBreak)
: printedArguments.slice(0, -1).some(willBreak)) || anyArgEmptyLine;
// We want to print the last argument with a special flag
let printedExpanded;
let i = 0;
path.each((argPath) => {
if (shouldGroupFirst && i === 0) {
printedExpanded = [
concat([
argPath.call((p) => print(p, { expandFirstArg: true })),
printedArguments.length > 1 ? "," : "",
hasEmptyLineFollowingFirstArg ? hardline : line,
hasEmptyLineFollowingFirstArg ? hardline : "",
]),
].concat(printedArguments.slice(1));
}
if (shouldGroupLast && i === args.length - 1) {
printedExpanded = printedArguments
.slice(0, -1)
.concat(argPath.call((p) => print(p, { expandLastArg: true })));
}
i++;
}, "arguments");
const somePrintedArgumentsWillBreak = printedArguments.some(willBreak);
return concat([
somePrintedArgumentsWillBreak ? breakParent : "",
conditionalGroup(
[
concat([
ifBreak(
indent(concat(["(", softline, concat(printedExpanded)])),
concat(["(", concat(printedExpanded)])
),
somePrintedArgumentsWillBreak ? softline : "",
")",
]),
shouldGroupFirst
? concat([
"(",
group(printedExpanded[0], { shouldBreak: true }),
concat(printedExpanded.slice(1)),
")",
])
: concat([
"(",
concat(printedArguments.slice(0, -1)),
group(getLast(printedExpanded), {
shouldBreak: true,
}),
")",
]),
group(
concat([
"(",
indent(concat([line, concat(printedArguments)])),
line,
")",
]),
{ shouldBreak: true }
),
],
{ shouldBreak }
),
]);
}
return group(
concat([
"(",
indent(concat([softline, concat(printedArguments)])),
// ifBreak(shouldPrintComma(options, "all") ? "," : ""),
softline,
")",
]),
{ shouldBreak: printedArguments.some(willBreak) || anyArgEmptyLine }
);
}
function shouldGroupFirstArg(args) {
if (args.length !== 2) {
return false;
}
const firstArg = args[0];
const secondArg = args[1];
return (
// (!firstArg.comments || !firstArg.comments.length) &&
firstArg.type === "FunctionDeclaration" && !couldGroupArg(secondArg)
);
}
function shouldGroupLastArg(args) {
const lastArg = getLast(args);
const penultimateArg = getPenultimate(args);
return (
couldGroupArg(lastArg) &&
// If the last two arguments are of the same type,
// disable last element expansion.
(!penultimateArg || penultimateArg.type !== lastArg.type)
);
}
function couldGroupArg(arg) {
return (
arg.type === "FunctionDeclaration" ||
arg.type === "TableConstructorExpression"
);
}
function getPenultimate(arr) {
if (arr.length > 1) {
return arr[arr.length - 2];
}
return null;
}
function getLast(arr) {
if (arr.length > 0) {
return arr[arr.length - 1];
}
return null;
}
module.exports = function genericPrint(path, options, print) {
const printed = printNoParens(path, options, print);
const node = path.getValue();
if (shouldHaveParens(node, path.getParentNode())) {
return concat(["(", printed, ")"]);
} else {
return printed;
}
};