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base.js
94 lines (72 loc) 路 2.28 KB
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base.js
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export function File(node: Object) {
if (node.program) {
// Print this here to ensure that Program node 'leadingComments' still
// get printed after the hashbang.
this.print(node.program.interpreter, node);
}
this.print(node.program, node);
}
export function Program(node: Object) {
this.printInnerComments(node, false);
this.printSequence(node.directives, node);
if (node.directives && node.directives.length) this.newline();
this.printSequence(node.body, node);
}
export function BlockStatement(node: Object) {
this.token("{");
this.printInnerComments(node);
const hasDirectives = node.directives?.length;
if (node.body.length || hasDirectives) {
this.newline();
this.printSequence(node.directives, node, { indent: true });
if (hasDirectives) this.newline();
this.printSequence(node.body, node, { indent: true });
this.removeTrailingNewline();
this.source("end", node.loc);
if (!this.endsWith("\n")) this.newline();
this.rightBrace();
} else {
this.source("end", node.loc);
this.token("}");
}
}
export function Noop() {}
export function Directive(node: Object) {
this.print(node.value, node);
this.semicolon();
}
// These regexes match an even number of \ followed by a quote
const unescapedSingleQuoteRE = /(?:^|[^\\])(?:\\\\)*'/;
const unescapedDoubleQuoteRE = /(?:^|[^\\])(?:\\\\)*"/;
export function DirectiveLiteral(node: Object) {
const raw = this.getPossibleRaw(node);
if (raw != null) {
this.token(raw);
return;
}
const { value } = node;
// NOTE: In directives we can't change escapings,
// because they change the behavior.
// e.g. "us\x65 string" (\x65 is e) is not a "use strict" directive.
if (!unescapedDoubleQuoteRE.test(value)) {
this.token(`"${value}"`);
} else if (!unescapedSingleQuoteRE.test(value)) {
this.token(`'${value}'`);
} else {
throw new Error(
"Malformed AST: it is not possible to print a directive containing" +
" both unescaped single and double quotes.",
);
}
}
export function InterpreterDirective(node: Object) {
this.token(`#!${node.value}\n`);
}
export function Placeholder(node: Object) {
this.token("%%");
this.print(node.name);
this.token("%%");
if (node.expectedNode === "Statement") {
this.semicolon();
}
}