/
renderHelpers.ts
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/
renderHelpers.ts
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import MagicString from 'magic-string';
import { Node, StatementNode } from '../ast/nodes/shared/Node';
import Variable from '../ast/variables/Variable';
import { InternalModuleFormat } from '../rollup/types';
import { PluginDriver } from './PluginDriver';
import { treeshakeNode } from './treeshakeNode';
export interface RenderOptions {
compact: boolean;
dynamicImportFunction: string | undefined;
exportNamesByVariable: Map<Variable, string[]>;
format: InternalModuleFormat;
freeze: boolean;
indent: string;
namespaceToStringTag: boolean;
outputPluginDriver: PluginDriver;
varOrConst: 'var' | 'const';
}
export interface NodeRenderOptions {
end?: number;
isCalleeOfRenderedParent?: boolean;
isNoStatement?: boolean;
isShorthandProperty?: boolean;
preventASI?: boolean;
renderedParentType?: string; // also serves as a flag if the rendered parent is different from the actual parent
start?: number;
}
export const NO_SEMICOLON: NodeRenderOptions = { isNoStatement: true };
// This assumes there are only white-space and comments between start and the string we are looking for
export function findFirstOccurrenceOutsideComment(code: string, searchString: string, start = 0) {
let searchPos, charCodeAfterSlash;
searchPos = code.indexOf(searchString, start);
while (true) {
start = code.indexOf('/', start);
if (start === -1 || start >= searchPos) return searchPos;
charCodeAfterSlash = code.charCodeAt(++start);
++start;
// With our assumption, '/' always starts a comment. Determine comment type:
start =
charCodeAfterSlash === 47 /*"/"*/
? code.indexOf('\n', start) + 1
: code.indexOf('*/', start) + 2;
if (start > searchPos) {
searchPos = code.indexOf(searchString, start);
}
}
}
const NON_WHITESPACE = /\S/g;
export function findNonWhiteSpace(code: string, index: number) {
NON_WHITESPACE.lastIndex = index;
const result = NON_WHITESPACE.exec(code)!;
return result.index;
}
// This assumes "code" only contains white-space and comments
// Returns position of line-comment if applicable
function findFirstLineBreakOutsideComment(code: string): [number, number] {
let lineBreakPos,
charCodeAfterSlash,
start = 0;
lineBreakPos = code.indexOf('\n', start);
while (true) {
start = code.indexOf('/', start);
if (start === -1 || start > lineBreakPos) return [lineBreakPos, lineBreakPos + 1];
// With our assumption, '/' always starts a comment. Determine comment type:
charCodeAfterSlash = code.charCodeAt(start + 1);
if (charCodeAfterSlash === 47 /*"/"*/) return [start, lineBreakPos + 1];
start = code.indexOf('*/', start + 3) + 2;
if (start > lineBreakPos) {
lineBreakPos = code.indexOf('\n', start);
}
}
}
export function renderStatementList(
statements: StatementNode[],
code: MagicString,
start: number,
end: number,
options: RenderOptions
) {
let currentNode, currentNodeStart, currentNodeNeedsBoundaries, nextNodeStart;
let nextNode = statements[0];
let nextNodeNeedsBoundaries = !nextNode.included || nextNode.needsBoundaries;
if (nextNodeNeedsBoundaries) {
nextNodeStart =
start + findFirstLineBreakOutsideComment(code.original.slice(start, nextNode.start))[1];
}
for (let nextIndex = 1; nextIndex <= statements.length; nextIndex++) {
currentNode = nextNode;
currentNodeStart = nextNodeStart;
currentNodeNeedsBoundaries = nextNodeNeedsBoundaries;
nextNode = statements[nextIndex];
nextNodeNeedsBoundaries =
nextNode === undefined ? false : !nextNode.included || nextNode.needsBoundaries;
if (currentNodeNeedsBoundaries || nextNodeNeedsBoundaries) {
nextNodeStart =
currentNode.end +
findFirstLineBreakOutsideComment(
code.original.slice(currentNode.end, nextNode === undefined ? end : nextNode.start)
)[1];
if (currentNode.included) {
currentNodeNeedsBoundaries
? currentNode.render(code, options, {
end: nextNodeStart,
start: currentNodeStart
})
: currentNode.render(code, options);
} else {
treeshakeNode(currentNode, code, currentNodeStart!, nextNodeStart);
}
} else {
currentNode.render(code, options);
}
}
}
// This assumes that the first character is not part of the first node
export function getCommaSeparatedNodesWithBoundaries<N extends Node>(
nodes: N[],
code: MagicString,
start: number,
end: number
): {
contentEnd: number;
end: number;
node: N;
separator: number | null;
start: number;
}[] {
const splitUpNodes = [];
let node, nextNode, nextNodeStart, contentEnd, char;
let separator = start - 1;
for (let nextIndex = 0; nextIndex < nodes.length; nextIndex++) {
nextNode = nodes[nextIndex];
if (node !== undefined) {
separator =
node.end +
findFirstOccurrenceOutsideComment(code.original.slice(node.end, nextNode.start), ',');
}
nextNodeStart = contentEnd =
separator +
1 +
findFirstLineBreakOutsideComment(code.original.slice(separator + 1, nextNode.start))[1];
while (
((char = code.original.charCodeAt(nextNodeStart)),
char === 32 /*" "*/ || char === 9 /*"\t"*/ || char === 10 /*"\n"*/ || char === 13) /*"\r"*/
)
nextNodeStart++;
if (node !== undefined) {
splitUpNodes.push({
contentEnd,
end: nextNodeStart,
node,
separator,
start
});
}
node = nextNode;
start = nextNodeStart;
}
splitUpNodes.push({
contentEnd: end,
end,
node: node as N,
separator: null,
start
});
return splitUpNodes;
}
// This assumes there are only white-space and comments between start and end
export function removeLineBreaks(code: MagicString, start: number, end: number) {
while (true) {
const [removeStart, removeEnd] = findFirstLineBreakOutsideComment(
code.original.slice(start, end)
);
if (removeStart === -1) {
break;
}
code.remove(start + removeStart, (start += removeEnd));
}
}