Merge pull request #30 from jackyzha0/latex-renderer

latex renderer live preview

3 files changed, 69 insertions, 13 deletions

diff --git a/frontend/src/components/renderers/Code.js b/frontend/src/components/renderers/Code.js
index 02c1cc6..9e7521b 100644
--- a/frontend/src/components/renderers/Code.js
+++ b/frontend/src/components/renderers/Code.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import { Light as SyntaxHighlighter } from 'react-syntax-highlighter';
 import { atomOneLight, ascetic, atomOneDark, dracula, ocean } from 'react-syntax-highlighter/dist/esm/styles/hljs';
+import styled from 'styled-components'
 
 export const THEMES = Object.freeze({
     'atom': atomOneLight,
@@ -34,16 +35,32 @@ export const LANGS = Object.freeze({
     'yaml': 'yaml'
 })
 
+const StyledPre = styled.pre`
+  padding: calc(0.8em - 1px) !important;
+  margin: 0;
+`
+
+const CodeBlock = styled.div`
+  width: 100%;
+  font-size: 0.8em;
+  min-height: 1.2em;
+  border-radius: 3px;
+  border: 1px solid #565656;
+  outline: none;
+  margin: 1.7em 0;
+  padding-right: calc(1.6em - 2px);
+`
+
 const CodeRenderer = React.forwardRef((props, ref) => {
 
     const Pre = (props) => {
         return (
-            <pre {...props} ref={ref} />
+            <StyledPre {...props} ref={ref} />
         );
     }
 
     return (
-        <div className="lt-shadow codeBlock">
+        <CodeBlock className="lt-shadow">
             <SyntaxHighlighter
                 ref={ref}
                 language={props.lang}
@@ -52,7 +69,7 @@ const CodeRenderer = React.forwardRef((props, ref) => {
                 PreTag={Pre}>
                 {props.content}
             </SyntaxHighlighter>
-        </div>
+        </CodeBlock>
     );
 });
 
diff --git a/frontend/src/components/renderers/Latex.js b/frontend/src/components/renderers/Latex.js
new file mode 100644
index 0000000..c5dd57c
--- /dev/null
+++ b/frontend/src/components/renderers/Latex.js
@@ -0,0 +1,38 @@
+import React from 'react';
+import { BlockMath, InlineMath } from 'react-katex';
+import 'katex/dist/katex.min.css';
+import styled from 'styled-components'
+
+const StyledInlineLatex = styled.div`
+    display: block;
+    margin-bottom: 0.5em;
+`
+
+class Latex extends React.Component {
+    render() {
+        // split by line break chars (\\, \newline, \break)
+        const els = this.props.content.split(/\\\\|\\newline|\\break/)
+
+        // if <=1 lines, just render block
+        if (els.length <= 1) {
+            return (
+                <BlockMath>
+                    {this.props.content}
+                </BlockMath>
+            );
+        } else {
+            // new inline block for every line
+            const blocks = els.map(line => 
+                <StyledInlineLatex>
+                    <InlineMath>
+                        {line}
+                    </InlineMath>
+                </StyledInlineLatex>
+            )
+
+            return blocks;
+        }
+    }
+}
+
+export default Latex
\ No newline at end of file
diff --git a/frontend/src/components/renderers/Raw.js b/frontend/src/components/renderers/Raw.js
index a8d0e31..7f8e7c1 100644
--- a/frontend/src/components/renderers/Raw.js
+++ b/frontend/src/components/renderers/Raw.js
@@ -1,6 +1,15 @@
 import React from 'react';
+import styled from 'styled-components'
 import { FetchPaste } from '../../helpers/httpHelper'
 
+const RawText = styled.pre`
+    word-wrap: break-word;
+    white-space: pre-wrap;
+    line-height: initial;
+    font-size: 0.8em;
+    padding: 0 1em;
+`
+
 class Raw extends React.Component {
 
     constructor(props) {
@@ -11,18 +20,10 @@ class Raw extends React.Component {
     }
 
     render() {
-        const styles = {
-            wordWrap: "break-word",
-            whiteSpace: "pre-wrap",
-            lineHeight: "initial", 
-            fontSize: "0.8em",
-            padding: "0 1em"
-        }
-
         return (
-            <pre style={styles}>
+            <RawText>
                 {this.state.content}
-            </pre>
+            </RawText>
         );
     }