From b95de8535964d3a631a4efde965b41d47c4c8527 Mon Sep 17 00:00:00 2001
From: Pomax <pomax@Fluffles.local>
Date: Tue, 4 Aug 2020 18:11:52 -0700
Subject: [PATCH] fallback building, part 1

---
 chapters/introduction/cubic.png         | Bin 13116 -> 391 bytes
 chapters/introduction/quadratic.png     | Bin 13116 -> 391 bytes
 chapters/whatis/interpolation.png       | Bin 13116 -> 977 bytes
 package-lock.json                       | 477 ++++++++++++++++++++++++
 package.json                            |   1 +
 tools/build/convert-markdown.js         |   6 +-
 tools/build/generate-placeholders.js    |  61 +++
 tools/build/process-locale.js           |   2 +
 tools/build/rewrite-graphics-element.js |  13 +
 9 files changed, 557 insertions(+), 3 deletions(-)
 create mode 100644 tools/build/generate-placeholders.js
 create mode 100644 tools/build/rewrite-graphics-element.js

diff --git a/chapters/introduction/cubic.png b/chapters/introduction/cubic.png
index 653228ab02df2f9b6eb7c702feee266282f80a8a..dd1b210b36865434d5e48344852ce82007ce3830 100644
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diff --git a/package-lock.json b/package-lock.json
index f7b47fc5..a9106814 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,6 +16,18 @@
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       "dev": true
     },
+    "abbrev": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true
+    },
     "ansi-styles": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
@@ -36,6 +48,22 @@
         "picomatch": "^2.0.4"
       }
     },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
+      "dev": true
+    },
+    "are-we-there-yet": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+      "dev": true,
+      "requires": {
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
+      }
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -96,6 +124,17 @@
         "fill-range": "^7.0.1"
       }
     },
+    "canvas": {
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+      "version": "2.3.7",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+      "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
+      "dev": true,
+      "requires": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      }
+    },
     "readdirp": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.4.0.tgz",
@@ -660,12 +1010,68 @@
         "picomatch": "^2.2.1"
       }
     },
+    "rimraf": {
+      "version": "2.7.1",
+      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.7.1.tgz",
+      "integrity": "sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==",
+      "dev": true,
+      "requires": {
+        "glob": "^7.1.3"
+      }
+    },
+    "safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+      "dev": true
+    },
+    "safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "dev": true
+    },
     "sax": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
       "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
       "dev": true
     },
+    "semver": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+      "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+      "dev": true
+    },
+    "set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
+      "dev": true
+    },
+    "signal-exit": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.3.tgz",
+      "integrity": "sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==",
+      "dev": true
+    },
+    "simple-concat": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
+      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q==",
+      "dev": true
+    },
+    "simple-get": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-3.1.0.tgz",
+      "integrity": "sha512-bCR6cP+aTdScaQCnQKbPKtJOKDp/hj9EDLJo3Nw4y1QksqaovlW/bnptB6/c1e+qmNIDHRK+oXFDdEqBT8WzUA==",
+      "dev": true,
+      "requires": {
+        "decompress-response": "^4.2.0",
+        "once": "^1.3.1",
+        "simple-concat": "^1.0.0"
+      }
+    },
     "source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -684,6 +1090,17 @@
       "integrity": "sha512-ji9qxRnOVfcuLDySj9qzhGSEFVobyt1kIOSkj1qZzYLzq7Tos/oUUWvotUPQLlrsidqsK6tBH89Bc9kL5zHA6w==",
       "dev": true
     },
+    "string-width": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+      "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+      "dev": true,
+      "requires": {
+        "code-point-at": "^1.0.0",
+        "is-fullwidth-code-point": "^1.0.0",
+        "strip-ansi": "^3.0.0"
+      }
+    },
     "string.prototype.trimend": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/string.prototype.trimend/-/string.prototype.trimend-1.0.1.tgz",
@@ -704,6 +1121,30 @@
         "es-abstract": "^1.17.5"
       }
     },
+    "string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
+    "strip-ansi": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+      "dev": true,
+      "requires": {
+        "ansi-regex": "^2.0.0"
+      }
+    },
+    "strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
+      "dev": true
+    },
     "supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -734,6 +1175,21 @@
         "util.promisify": "~1.0.0"
       }
     },
+    "tar": {
+      "version": "4.4.13",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.13.tgz",
+      "integrity": "sha512-w2VwSrBoHa5BsSyH+KxEqeQBAllHhccyMFVHtGtdMpF4W7IRWfZjFiQceJPChOeTsSDVUpER2T8FA93pr0L+QA==",
+      "dev": true,
+      "requires": {
+        "chownr": "^1.1.1",
+        "fs-minipass": "^1.2.5",
+        "minipass": "^2.8.6",
+        "minizlib": "^1.2.1",
+        "mkdirp": "^0.5.0",
+        "safe-buffer": "^5.1.2",
+        "yallist": "^3.0.3"
+      }
+    },
     "to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -756,6 +1212,12 @@
       "integrity": "sha1-j97XMk7G6IoP+LkF58CYzcCG1UQ=",
       "dev": true
     },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
     "util.promisify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.1.tgz",
@@ -768,11 +1230,26 @@
         "object.getownpropertydescriptors": "^2.1.0"
       }
     },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
+    },
+    "yallist": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index af42e03a..659cccfc 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "ebook"
   ],
   "devDependencies": {
+    "canvas": "^2.6.1",
     "fs-extra": "^9.0.1",
     "glob": "^7.1.6",
     "marked": "^1.1.1",
diff --git a/tools/build/convert-markdown.js b/tools/build/convert-markdown.js
index 64917645..aaab4c90 100644
--- a/tools/build/convert-markdown.js
+++ b/tools/build/convert-markdown.js
@@ -12,7 +12,7 @@ module.exports = async function convertMarkDown(markdown) {
     let latexSection = 0,
       pos = -1,
       data = markdown,
-      latex = [],
+      latex = {},
       startmark = `<script type="text/latex">`,
       endmark = `</script>`;
 
@@ -20,7 +20,7 @@ module.exports = async function convertMarkDown(markdown) {
       pos = data.indexOf(startmark);
       if (pos !== -1) {
         let endpos = data.indexOf(endmark, pos) + endmark.length;
-        let key = `latex${latexSection}`;
+        let key = `latex${latexSection++}`;
         latex[key] = data.substring(
           pos + startmark.length,
           endpos - endmark.length
@@ -47,6 +47,6 @@ module.exports = async function convertMarkDown(markdown) {
       .replace(/&quot;/g, '"')
       .replace(/<p>{{/g, `{{`)
       .replace(/}}<\/p>/g, `}}`);
-
+    
     return nunjucks.renderString(converted, latex);
   }
diff --git a/tools/build/generate-placeholders.js b/tools/build/generate-placeholders.js
new file mode 100644
index 00000000..87e7b73b
--- /dev/null
+++ b/tools/build/generate-placeholders.js
@@ -0,0 +1,61 @@
+const fs = require("fs-extra");
+const path = require("path");
+const canvas = require("canvas");
+const rewriteGraphicsElement = require("./rewrite-graphics-element");
+const localeStrings = require("../../locale-strings.json");
+const defaultLocale = localeStrings.defaultLocale;
+
+module.exports = async function generatePlaceHolders(locale, markdown) {
+    if (locale !== defaultLocale) return;
+
+    let graphic = 0,
+      pos = -1,
+      data = markdown,
+      elements = {},
+      startmark = `<graphics-element`,
+      endmark = `</graphics-element>`;
+
+    do {
+      pos = data.indexOf(startmark);
+      if (pos !== -1) {
+        let endpos = data.indexOf(endmark, pos) + endmark.length;
+        let key = `graphic${graphic++}`;
+        elements[key] = data.substring(pos, endpos - endmark.length);
+        data = `${data.slice(0, pos)}{{ ${key} }}${data.slice(endpos)}`;
+      }
+    } while (pos !== -1);
+
+    const keys = Object.keys(elements);
+    sourcePaths = Object.values(elements).map(v => v.match(/src="([^"]+)"/)[1]);
+
+    sourcePaths.forEach((sourcePath,i) => {
+        try {
+            sourcePath = path.join(__dirname, "..", "..", sourcePath);
+            let code = fs.readFileSync(sourcePath).toString(`utf8`);
+            let width = elements[keys[i]].match(`width="([^"]+)"`)[1];
+            let height = elements[keys[i]].match(`height="([^"]+)"`)[1];
+
+            // TODO: figure out how to convert this code to code that will
+            //       actually run in Node, with node's `canvas` module backing
+            //       rather than the HTMLCanvasElement object, and in a way
+            //       that uses `require()` or `import`, but not both.
+            
+            let nodeCode = rewriteGraphicsElement(code, width, height);
+
+            var m = new module.constructor();
+            m.paths = module.paths;
+            m._compile(nodeCode, sourcePath);
+
+            const sketch = m.exports;
+            const dataURI = sketch.toDataURL();
+            const start = dataURI.indexOf(`base64,`) + 7;
+            const imageData = Buffer.from(dataURI.substring(start), `base64`);
+            const filename = sourcePath.replace(`.js`, `.png`);
+
+            console.log(`Writing placeholder to ${filename}`);
+            fs.writeFileSync(filename, imageData);
+        } catch (e) {
+            console.error(e);
+        }
+    });
+};
diff --git a/tools/build/process-locale.js b/tools/build/process-locale.js
index 0774d2c8..562e0c77 100644
--- a/tools/build/process-locale.js
+++ b/tools/build/process-locale.js
@@ -3,6 +3,7 @@ const path = require("path");
 const localeStrings = require("../../locale-strings.json");
 const defaultLocale = localeStrings.defaultLocale
 const convertMarkDown = require("./convert-markdown.js");
+const generatePlaceHolders = require("./generate-placeholders.js");
 const nunjucks = require("nunjucks");
 
 nunjucks.configure(".", { autoescape: false });
@@ -38,6 +39,7 @@ module.exports = async function processLocale(
       const chapter = file.match(/chapters\/([^/]+)\/content./)[1];
       try {
         const markdown = fs.readFileSync(file).toString("utf8");
+        await generatePlaceHolders(locale, markdown);
         const replaced = nunjucks.renderString(markdown, {
           disableMessage: `<span>${localeStrings.disabledMessage[locale]}</span>`,
         });
diff --git a/tools/build/rewrite-graphics-element.js b/tools/build/rewrite-graphics-element.js
new file mode 100644
index 00000000..26a2938c
--- /dev/null
+++ b/tools/build/rewrite-graphics-element.js
@@ -0,0 +1,13 @@
+module.exports = function rewriteGraphicsElement(code, width, height) {
+
+    // const split = splitCodeSections(code);
+    // const globalCode = split.quasiGlobal;
+    // const classCode = performCodeSurgery(split.classCode);
+
+    return `
+        const { createCanvas, loadImage } = require('canvas');
+        const canvas = createCanvas(${width}, ${height});
+        const ctx = canvas.getContext('2d');
+        module.exports = canvas;
+    `;
+};