basic muddle parser

2024-01-03 16:27:34 -05:00 · 2024-01-03 16:27:34 -05:00 · 8aa2726b4b
parent 0a4762f758
commit 8aa2726b4b
3 changed files with 3261 additions and 0 deletions
--- a/beta.mud
+++ b/beta.mud
--- a/mudparse.js
+++ b/mudparse.js
@ -0,0 +1,103 @@
+// parse beta.mud
+export const removeComments = (text) => {
+    let newText = []
+    let i = 0
+    while (i < text.length) {
+        let iLim = text.indexOf("/*", i)
+        let iNext
+        if (iLim < 0) {
+            iLim = text.length
+            iNext = iLim
+        } else {
+            const iCommentEnd = text.indexOf("*/", iLim + 2)
+            if (iCommentEnd > 0) {
+                iNext = iCommentEnd + 2
+            } else {
+                throw new Error(`Comment started at ${iLim} has no end`)
+            }
+        }
+        newText.push(text.slice(i, iLim))
+        i = iNext
+    }
+    return newText.join("")
+}
+
+const splitLine = (line) => {
+    const tokens = line.trim().split(/\s+/)
+    return (tokens.length == 1 && tokens[0] == '') ? [] : tokens
+}
+
+const reString = /^"(.*)"$/
+const parseResourceLine = (line, dict) => {
+    const tokens = splitLine(line)
+    if (tokens.length == 1 && tokens[0] == "}") {
+        return false
+    } else if (tokens.length == 0) {
+        return true
+    } else if (tokens.length == 1 || !tokens[0].endsWith(":") || !tokens[1].match(reString)) {
+        throw new Error(`Expected 'key: "value"' but got '${line}'`)
+    } else {
+        const key = tokens[0].slice(0, -1)
+        const value = { filename: tokens[1].match(reString)[1] }
+        if (tokens.length > 2) {
+            value.arguments = tokens.slice(2).map((v) => parseInt(v)) // would be nice to know what these mean
+        }
+        dict[key] = value
+        return true
+    }
+}
+
+const parseClassLine = (line, cls) => {
+    const tokens = splitLine(line)
+    if (tokens.length == 1 && tokens[0] == "}") {
+        return false
+    } else if (tokens.length == 0) {
+        return true
+    } else if (tokens.length == 1) {
+        throw new Error(`Expected "resourcetype reference" but got ${line}`)
+    } else {
+        const resourceType = tokens[0]
+        if (!cls[resourceType]) {
+            cls[resourceType] = []
+        }
+        const array = cls[resourceType]
+        if (resourceType == "byte" && tokens.length == 2) {
+            array.push(parseInt(tokens[1]))
+        } else if (tokens.length == 2) {
+            array.push({ id: tokens[1] })
+        } else {
+            array.push({ id: tokens[1], arguments: tokens.slice(2).map((v) => parseInt(v)) })
+        }
+        return true
+    }
+}
+
+const parseStructure = (lines, iline, struct, parser) => {
+    while (parser(lines[iline], struct)) {
+        iline ++
+    }
+    return iline
+}
+
+const parseMud = (lines) => {
+    const mud = {"class": {}}
+    for (let iline = 0; iline < lines.length; iline ++) {
+        const tokens = splitLine(lines[iline])
+        if (tokens.length == 2 && tokens[1] == "{") {
+            const mapping = {}
+            iline = parseStructure(lines, iline + 1, mapping, parseResourceLine)
+            mud[tokens[0]] = mapping
+        } else if (tokens.length == 4 && tokens[0] == "class" && tokens[3] == "{") {
+            const cls = { id: parseInt(tokens[2]) }
+            iline = parseStructure(lines, iline + 1, cls, parseClassLine)
+            mud.class[tokens[1]] = cls
+        } else if (tokens.length != 0) {
+            throw new Error(`Expected "resourcetype {" but got ${lines[iline]}`)
+        }
+    }
+    return mud
+}
+
+export const parse = (text) => {
+    return parseMud(removeComments(text).split("\n"))
+}
--- a/objects.html
+++ b/objects.html
@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="UTF-8"/>
+        <title>Inhabitor - The Habitat Inspector</title>
+        <style type="text/css">
+            body {
+                margin:40px auto;
+                line-height:1.6;
+                font-size:18px;
+                color:#444;
+                padding:0 10px
+            }
+            h1,h2,h3 {
+                line-height:1.2
+            }
+        </style>
+    </head>
+    <body>
+        <h1>Inhabitor - The Habitat Inspector</h1>
+        <div id="muddle">
+            <h3>Muddle database</h3>
+        </div>
+        <a href="javascript:showErrors();">Show errors</a>
+        <div id="errors" style="display: none"></div>
+
+        <script type="module">
+            import { parse, removeComments } from "./mudparse.js"
+            import { textNode } from "./show.js"
+
+            window.showErrors = () => {
+                document.getElementById('errors').style.display = 'block'
+            }
+            const onload = async () => {
+                const response = await fetch("beta.mud", { cache: "no-cache" })
+                const text = await response.text()
+                const container = document.getElementById("muddle")
+                const mud = parse(text)
+                container.appendChild(textNode(JSON.stringify(mud, null, 2), "pre"))
+            }
+            onload()
+        </script>
+    </body>
+</html>