Feature/syntaxhighlighting (#9)

* wip code highlighting of lines

* Implements gutter component

* WIP: Profiler with gutter

* cleaned up highlight code

* Removes before content for gutter styling

* Styles gutter

* Add correct Profiler code content

* Adds color variable for gutter gray

* refactor code component width gutter and diffing

7 files changed, 159 insertions, 52 deletions

diff --git a/packages/dev-tools-pages/package.json b/packages/dev-tools-pages/package.json
index c85ff44a6..eb34e3715 100644
--- a/packages/dev-tools-pages/package.json
+++ b/packages/dev-tools-pages/package.json
@@ -18,7 +18,6 @@
     "dependencies": {
         "@0xproject/react-shared": "^1.0.15",
         "highlight.js": "^9.13.1",
-        "highlighter": "^0.1.0",
         "less": "^2.7.2",
         "polished": "^1.9.2",
         "react": "^16.5.2",
diff --git a/packages/dev-tools-pages/ts/components/Code.tsx b/packages/dev-tools-pages/ts/components/Code.tsx
index 5a03e79ac..ce4443357 100644
--- a/packages/dev-tools-pages/ts/components/Code.tsx
+++ b/packages/dev-tools-pages/ts/components/Code.tsx
@@ -4,12 +4,13 @@ import styled from 'styled-components';
 import { colors } from 'ts/variables';
 import BaseButton from './Button';
 
-var highlight = require('highlighter')();
-
 interface CodeProps {
     children: React.ReactNode;
     language?: string;
     light?: boolean;
+    diff?: boolean;
+    gutter?: Array<number>;
+    gutterLength?: number;
 }
 
 interface CodeState {
@@ -30,37 +31,73 @@ const Button = styled(BaseButton)`
 
 const Base =
     styled.div <
-        CodeProps >
-        `
+    CodeProps >
+    `
     color: ${props => (props.language === undefined ? colors.white : 'inherit')};
     background-color: ${props =>
-            props.light ? 'rgba(255,255,255,.15)' : props.language === undefined ? colors.black : colors.lightGray};
+        props.light ? 'rgba(255,255,255,.15)' : props.language === undefined ? colors.black : '#F1F4F5'};
     white-space: ${props => (props.language === undefined ? 'nowrap' : '')};
     position: relative;
+
+    ${props =>
+        props.diff
+            ? `
+        background-color: #E9ECED;
+        display: flex;
+        padding-top: 1.5rem;
+        padding-bottom: 1.5rem;
+    `
+            : `
+        padding: 1.5rem;
+    `}
+
+    overflow-y: scroll;
+    -webkit-overflow-scrolling: touch;
+
     &:hover ${Button} {
         opacity: 1;
     }
 `;
 
-const StyledCode = styled.code`
-    padding-top: 1.5rem;
-    padding-bottom: 1.5rem;
-    display: block;
-    overflow-y: scroll;
-    -webkit-overflow-scrolling: touch;
+const StyledCodeDiff =
+    styled.code <
+    any >
+    `
+    ::before {
+        content: '';
+        width: calc(.75rem + ${props => props.gutterLength}ch);
+        background-color: #e2e5e6;
+        position: absolute;
+        top: 0;
+        left: 0;
+        bottom: 0;
+    }
 
-    
-    .diff-addition {
-        background-color: #d2e9e0;
-        padding: 0.3125rem;
+    [class^='line-'] {
         display: inline-block;
         width: 100%;
+        position: relative;
+        padding-right: 1.5rem;
+        padding-left: calc(2.25rem + ${props => props.gutterLength}ch);
+        ::before {
+            content: attr(data-test);
+            font-size: 0.875rem;
+            width: ${props => props.gutterLength};
+            padding-left: .375rem;
+            padding-right: .375rem;
+            position: absolute;
+            top: 50%;
+            left: 0;
+            transform: translateY(-50%);
+            z-index: 1;
+        }
     }
-    .diff-deletion {
-        background-color: #ebdcdc;
-        padding: 0.3125rem;
-        display: inline-block;
-        width: 100%;
+
+    .line-addition {
+        background-color: rgba(0, 202, 105, 0.1);
+    }
+    .line-deletion {
+        background-color: rgba(255, 0, 0, 0.07);
     }
 `;
 
@@ -88,13 +125,16 @@ class Code extends React.Component<CodeProps, CodeState> {
     }
 
     async componentDidMount() {
-        const { language, children } = this.props;
+        const { language, children, diff, gutter } = this.props;
+
+        const code = children as string;
 
         if (language !== undefined) {
-            const { default: hljs } = await System.import(/* webpackChunkName: 'highlightjs' */ 'ts/highlight');
+            const { default: highlight } = await System.import(/* webpackChunkName: 'highlightjs' */ 'ts/highlight');
 
-            const hlCode = hljs(children as string, language);
-            this.setState({ hlCode });
+            this.setState({
+                hlCode: highlight(language, code, diff, gutter),
+            });
         }
     }
 
@@ -115,16 +155,20 @@ class Code extends React.Component<CodeProps, CodeState> {
     };
 
     render() {
-        const { language, light, children } = this.props;
+        const { language, light, diff, children, gutterLength } = this.props;
+        const { hlCode } = this.state;
+
+        const Code = diff ? StyledCodeDiff : 'code';
 
         return (
-            <Base language={language} light={light}>
+            <Base language={language} diff={diff} light={light}>
                 <StyledPre>
-                    {this.state.hlCode !== undefined ? (
-                        <StyledCode dangerouslySetInnerHTML={{ __html: this.state.hlCode }} />
-                    ) : (
-                            <StyledCode>{this.props.children}</StyledCode>
-                        )}
+                    <Code
+                        gutterLength={gutterLength}
+                        dangerouslySetInnerHTML={hlCode ? { __html: this.state.hlCode } : null}
+                    >
+                        {hlCode === undefined ? children : null}
+                    </Code>
                 </StyledPre>
                 {navigator.userAgent !== 'ReactSnap' ? <Button onClick={this.handleCopy}>Copy</Button> : null}
                 {!('clipboard' in navigator) ? (
diff --git a/packages/dev-tools-pages/ts/components/Intro.tsx b/packages/dev-tools-pages/ts/components/Intro.tsx
index 4fc1289fb..e5c95d4c2 100644
--- a/packages/dev-tools-pages/ts/components/Intro.tsx
+++ b/packages/dev-tools-pages/ts/components/Intro.tsx
@@ -43,6 +43,7 @@ const IntroLead = styled(Lead)`
 `;
 const IntroAside = styled.div`
     max-width: 32.5rem;
+    position: relative; 
 
     ${media.small`
         margin-left: -30px;
diff --git a/packages/dev-tools-pages/ts/highlight.tsx b/packages/dev-tools-pages/ts/highlight.tsx
index 9d7844c89..7187118d0 100644
--- a/packages/dev-tools-pages/ts/highlight.tsx
+++ b/packages/dev-tools-pages/ts/highlight.tsx
@@ -1,8 +1,47 @@
-const highlight = require('highlight.js/lib/highlight');
+const hljs = require('highlight.js/lib/highlight');
 const javascript = require('highlight.js/lib/languages/javascript');
-const json = require('highlight.js/lib/languages/json');
 
-highlight.registerLanguage('javascript', javascript);
-highlight.registerLanguage('json', json);
+hljs.registerLanguage('javascript', javascript);
+
+interface PatchInterface {
+    [key: string]: string;
+}
+
+var PATCH_TYPES: PatchInterface = {
+    '+': 'addition',
+    '-': 'deletion',
+    '!': 'change',
+};
+
+function diffHighlight(language: string, code: any, gutter: any) {
+    return code
+        .split(/\r?\n/g)
+        .map((line: string, index: number) => {
+            var type;
+            if (/^-{3} [^-]+ -{4}$|^\*{3} [^*]+ \*{4}$|^@@ [^@]+ @@$/.test(line)) {
+                type = 'chunk';
+            } else if (/^Index: |^[+\-*]{3}|^[*=]{5,}$/.test(line)) {
+                type = 'header';
+            } else {
+                type = PATCH_TYPES[line[0] as string] || 'null';
+                line = line.replace(/^[+\-! ]/, '');
+            }
+
+            const g = gutter[index];
+
+            return `<span data-test="${g !== undefined ? g + 'x' : ''}" class="line-${type}">${
+                hljs.highlight(language, line).value
+            }</span>`;
+        })
+        .join('\n');
+}
+
+function highlight(language: string, code: string, diff: boolean, gutter: any) {
+    if (diff) {
+        return diffHighlight(language, code, gutter);
+    }
+
+    return hljs.highlight(language, code).value;
+}
 
 export default highlight;
diff --git a/packages/dev-tools-pages/ts/pages/Cov.tsx b/packages/dev-tools-pages/ts/pages/Cov.tsx
index 01966537c..197ff174d 100644
--- a/packages/dev-tools-pages/ts/pages/Cov.tsx
+++ b/packages/dev-tools-pages/ts/pages/Cov.tsx
@@ -22,19 +22,25 @@ function Cov() {
                     coverage.
                 </IntroLead>
                 <IntroAside>
-                    <Code language="js.diff">
+                    <Code
+                        language="javascript"
+                        diff
+                        gutterLength={2}
+                        gutter={[4, undefined, 4, 4, 4, undefined, 4, 2, 2, 2]}
+                    >
                         {`+function executeTransaction(uint transactionId)
-    public
-+notExecuted(transactionId)
-+pastTimeLock(transactionId)
+     public
++    notExecuted(transactionId)
++    fullyConfirmed(transactionId)
++    pastTimeLock(transactionId)
 { 
-+Transaction storage tx = transactions[transactionId]
-+tx.executed = true
-+if (tx.destination.call.value(tx.value)(tx.data))
-+Execution(transactionId)
-else {
--ExecutionFailure(transactionId)
-
++    Transaction storage tx = transactions[transactionId]
++    tx.executed = true
++    if (tx.destination.call.value(tx.value)(tx.data))
++        Execution(transactionId)
+     else {
+-        ExecutionFailure(transactionId)
+-        tx.executed = false
     }
 }`}
                     </Code>
@@ -69,7 +75,7 @@ else {
 
                     <Tabs>
                         <TabBlock title="Sol-compiler">
-                            <Code language="js">
+                            <Code language="javascript">
                                 {`import { SolCompilerArtifactAdapter } from '@0x/sol-trace';
 
 // Both artifactsDir and contractsDir are optional and will be fetched from compiler.json if not passed in
diff --git a/packages/dev-tools-pages/ts/pages/Profiler.tsx b/packages/dev-tools-pages/ts/pages/Profiler.tsx
index ac88bd933..462789a16 100644
--- a/packages/dev-tools-pages/ts/pages/Profiler.tsx
+++ b/packages/dev-tools-pages/ts/pages/Profiler.tsx
@@ -9,18 +9,35 @@ import { Tabs, TabBlock } from 'ts/components/Tabs';
 import Code from 'ts/components/Code';
 import InlineCode from 'ts/components/InlineCode';
 import { List, ListItem } from 'ts/components/List';
-import Intro from 'ts/components/Intro';
 import Breakout from 'ts/components/Breakout';
+import { Intro, IntroLead, IntroAside } from 'ts/components/Intro';
 
 function Profiler() {
     return (
         <Base context={context}>
-            <Intro title="ra">
-                <p>
+            <Intro title="Headline">
+                <IntroLead>
                     Sol-profiler gathers line-by-line gas usage for any transaction submitted through your provider.
                     This will help you find unexpected inefficiencies in parts of your smart contract, and take a
                     data-driven approach to optimizing it.
-                </p>
+                </IntroLead>
+                <IntroAside>
+                    <Code language="javascript" diff gutterLength={6} gutter={[15, 15, undefined, 21747, 20303, 1435]}>
+                        {`+function() public payable {
++    deposit();
+}
++function deposit() public payabble {
++    balanceOf[msg.sender] += msg.value; 
++    Deposit(msg.sender, msg.value);
+}
+-function withdraw(uint wad) public {
+-    require(balanceOf[msg.sender] >= wad);
+-    balanceOf[msg.sender] -= wad;
+-    msg.sender.transfer(wad);
+-    Withdrawal(msg.sender, wad);
+}`}
+                    </Code>
+                </IntroAside>
             </Intro>
             <Content>
                 <ContentBlock main title="Get started" />
diff --git a/packages/dev-tools-pages/ts/variables.tsx b/packages/dev-tools-pages/ts/variables.tsx
index 8f08d13eb..76a675546 100644
--- a/packages/dev-tools-pages/ts/variables.tsx
+++ b/packages/dev-tools-pages/ts/variables.tsx
@@ -6,6 +6,7 @@ const colors = {
     lightGray: '#F1F4F5',
     gray: '#F1F2F7',
     darkGray: '#E9ECED',
+    darkestGray: '#E2E5E6',
     blueGray: '#ECEFF9',
 };