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| import React from 'react';
import createElement from './create-element';
const newLineRegex = /\n/g;
function getNewLines(str) {
return str.match(newLineRegex);
}
function getLineNumbers({ lines, startingLineNumber, style }) {
return lines.map((_, i) => {
const number = i + startingLineNumber;
return (
<span
key={`line-${i}`}
className='react-syntax-highlighter-line-number'
style={typeof style === 'function' ? style(number) : style}
>
{`${number}\n`}
</span>
);
});
}
function LineNumbers({
codeString,
containerStyle = {float: 'left', paddingRight: '10px'},
numberStyle = {},
startingLineNumber
}) {
return (
<code style={containerStyle}>
{getLineNumbers({
lines: codeString.replace(/\n$/, '').split('\n'),
style: numberStyle,
startingLineNumber
})}
</code>
);
}
function createLineElement({ children, lineNumber, lineStyle, className = [] }) {
return {
type: 'element',
tagName: 'span',
properties: {
className,
style: (
typeof lineStyle === 'function'
?
lineStyle(lineNumber)
:
lineStyle
)
},
children
}
}
function flattenCodeTree(tree, className = [], newTree = []) {
for (let i = 0; i < tree.length; i++) {
const node = tree[i];
if (node.type === 'text') {
newTree.push(createLineElement({
children: [node],
className
}));
}
else Eif (node.children) {
const classNames = className.concat(node.properties.className);
newTree = newTree.concat(flattenCodeTree(node.children, classNames));
}
}
return newTree;
}
function wrapLinesInSpan(codeTree, lineStyle) {
const tree = flattenCodeTree(codeTree.value);
const newTree = [];
let lastLineBreakIndex = -1;
let index = 0;
while (index < tree.length) {
const node = tree[index];
const value = node.children[0].value;
const newLines = getNewLines(value);
if (newLines) {
const splitValue = value.split('\n');
splitValue.forEach((text, i) => {
const lineNumber = newTree.length + 1;
const newChild = { type: 'text', value: `${text}\n`};
if (i === 0) {
const children = tree.slice(
lastLineBreakIndex + 1,
index
).concat(createLineElement({ children: [newChild], className: node.properties.className }));
newTree.push(createLineElement({ children, lineNumber, lineStyle }));
} else if (i === splitValue.length - 1) {
const stringChild = (
tree[index + 1] &&
tree[index + 1].children &&
tree[index + 1].children[0]
);
if (stringChild) {
const lastLineInPreviousSpan = { type: 'text', value: `${text}`};
const newElem = createLineElement({ children: [lastLineInPreviousSpan], className: node.properties.className });
tree.splice(index + 1, 0, newElem);
} else {
newTree.push(createLineElement({ children: [newChild], lineNumber, lineStyle }));
}
} else {
newTree.push(createLineElement({ children: [newChild], lineNumber, lineStyle }));
}
});
lastLineBreakIndex = index;
}
index++;
}
if (lastLineBreakIndex !== tree.length - 1) {
const children = tree.slice(lastLineBreakIndex + 1, tree.length);
Eif (children && children.length) {
newTree.push(createLineElement({ children, lineNumber: newTree.length + 1, lineStyle }));
}
}
return newTree;
}
function defaultRenderer({ rows, stylesheet, useInlineStyles }) {
return (
rows.map((node, i) => createElement({
node,
stylesheet,
useInlineStyles,
key: `code-segement${i}`
}))
);
}
export default function (lowlight, defaultStyle) {
return function SyntaxHighlighter({
language,
children,
style = defaultStyle,
customStyle = {},
codeTagProps = {},
useInlineStyles = true,
showLineNumbers = false,
startingLineNumber = 1,
lineNumberContainerStyle,
lineNumberStyle,
wrapLines,
lineStyle = {},
renderer,
PreTag='pre',
CodeTag='code',
...rest
}) {
/*
* some custom renderers rely on individual row elements so we need to turn wrapLines on
* if renderer is provided and wrapLines is undefined
*/
wrapLines = renderer && wrapLines === undefined ? true : wrapLines;
renderer = renderer || defaultRenderer;
const codeTree = (
language && !!lowlight.getLanguage(language) ?
lowlight.highlight(language, children) :
lowlight.highlightAuto(children)
);
if (codeTree.language === null) {
codeTree.value = [{ type: 'text', value: children }];
}
const defaultPreStyle = style.hljs || { backgroundColor: '#fff' };
const preProps = (
useInlineStyles
?
Object.assign({}, rest, { style: Object.assign({}, defaultPreStyle, customStyle) })
:
Object.assign({}, rest, { className: 'hljs'})
);
const tree = wrapLines ? wrapLinesInSpan(codeTree, lineStyle) : codeTree.value;
const lineNumbers = (
showLineNumbers
?
<LineNumbers
containerStyle={lineNumberContainerStyle}
numberStyle={lineNumberStyle}
startingLineNumber={startingLineNumber}
codeString={children}
/>
:
null
);
return (
<PreTag {...preProps}>
{lineNumbers}
<CodeTag {...codeTagProps}>
{renderer({ rows: tree, stylesheet: style, useInlineStyles })}
</CodeTag>
</PreTag>
);
}
}
|