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<p class="section_header"><a href="intro.html">Introduction</a></p>
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<h3><a href="ch1.html">Chapter I</a>: The Inform Language</h3>
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<p class="section_header"><a href="s1.html">§1</a> Routines</p>
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<ul class="section_detail">
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<li><a href="s1.html#s1_1">1.1.</a> Getting started</li>
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<li><a href="s1.html#s1_2">1.2.</a> Hello World</li>
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<li><a href="s1.html#s1_3">1.3.</a> Routine calls, errors and warnings</li>
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<li><a href="s1.html#s1_4">1.4.</a> Numbers and other constants</li>
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<li><a href="s1.html#s1_5">1.5.</a> Variables</li>
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<li><a href="s1.html#s1_6">1.6.</a> Arithmetic, assignment and bitwise operators</li>
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<li><a href="s1.html#s1_7">1.7.</a> Arguments and return values</li>
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<li><a href="s1.html#s1_8">1.8.</a> Conditions: <code>if</code>, <code>true</code> and <code>false</code></li>
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<li><a href="s1.html#s1_9">1.9.</a> Code blocks, <code>else</code> and <code>switch</code></li>
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<li><a href="s1.html#s1_10">1.10.</a> <code>while</code>, <code>do</code>… <code>until</code>,
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<code>for</code>, <code>break</code>, <code>continue</code></li>
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<li><a href="s1.html#s1_11">1.11.</a> How text is printed</li>
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<li><a href="s1.html#s1_12">1.12.</a> The <code>print</code> and <code>print_ret</code> statements</li>
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<li><a href="s1.html#s1_13">1.13.</a> Other printing statements</li>
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<li><a href="s1.html#s1_14">1.14.</a> Generating random numbers</li>
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<li><a href="s1.html#s1_15">1.15.</a> Deprecated ways to jump around</li>
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<p class="section_header"><a href="s2.html">§2</a> The state of play</p>
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<ul class="section_detail">
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<li><a href="s2.html#s2_1">2.1.</a> Directives construct things</li>
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<li><a href="s2.html#s2_2">2.2.</a> Constants</li>
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<li><a href="s2.html#s2_3">2.3.</a> Global variables</li>
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<li><a href="s2.html#s2_4">2.4.</a> Arrays</li>
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<li><a href="s2.html#s2_5">2.5.</a> Reading into arrays from the keyboard</li>
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<p class="section_header"><a href="s3.html">§3</a> Objects</p>
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<ul class="section_detail">
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<li><a href="s3.html#s3_1">3.1.</a> Objects, classes, metaclasses and <code>nothing</code></li>
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<li><a href="s3.html#s3_2">3.2.</a> The object tree</li>
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<li><a href="s3.html#s3_2">3.3.</a> Declaring objects 1: setting up the object tree</li>
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<li><a href="s3.html#s3_4">3.4.</a> Tree statements: <code>move</code>, <code>remove</code>, <code>objectloop</code></li>
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<li><a href="s3.html#s3_5">3.5.</a> Declaring objects 2: <code>with</code> and <code>provides</code></li>
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<li><a href="s3.html#s3_6">3.6.</a> Declaring objects 3: <code>private</code> properties</li>
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<li><a href="s3.html#s3_7">3.7.</a> Declaring objects 4: <code>has</code> and <code>give</code></li>
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<li><a href="s3.html#s3_8">3.8.</a> Declaring objects 5: <code>class</code> inheritance</li>
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<li><a href="s3.html#s3_9">3.9.</a> Messages</li>
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<li><a href="s3.html#s3_10">3.10.</a> Passing messages up to the superclass</li>
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<li><a href="s3.html#s3_11">3.11.</a> Creating and deleting objects during play</li>
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<li><a href="s3.html#s3_12">3.12.</a> Sending messages to routines and strings</li>
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<li><a href="s3.html#s3_13">3.13.</a> Common properties and <code>Property</code></li>
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<li><a href="s3.html#s3_14">3.14.</a> Philosophy</li>
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<h3><a href="ch2.html">Chapter II:</a> Introduction to Designing</h3>
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<p class="section_header"><a href="s4.html">§4</a> ‘Ruins’ begun</p>
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<p class="section_detail">Beginning to lay ‘Ruins’; including library files; the <code>Initialise</code> routine;
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some properties of mushrooms; <code>name</code>, <code>description</code> and <code>initial</code>; <code>edible</code>
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foodstuffs; introducing <code>before</code> and <code>after</code> rules; the stone steps.</p>
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<p class="section_header"><a href="s5.html">§5</a> Introducing messages and classes</p>
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<p class="section_detail">Recap of message-sending: a parrot; classes for treasure artifacts: the pygmy
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statuette, the honeycomb; how clashes are sorted out in class inheritance,
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<p class="section_header"><a href="s6.html">§6</a> Actions and reactions</p>
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<p class="section_detail">Actions are attempts; generating them with <code><</code>, <code><<</code>; the <code>actor</code>, <code>action</code>, <code>noun</code>
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and <code>second</code> noun; the <code>##</code> notation; actions fall into three groups; fake actions
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like <code>ThrownAt</code>; creating new actions, the <code>Blorple</code> example; how actions are
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processed, over ‘Before’, ‘During’ and ‘After’ stages.</p>
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<p class="section_header"><a href="s7.html">§7</a> Infix and the debugging verbs</p>
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<p class="section_detail">Three levels; general strategies; command lists and “recording”, “replay”
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and “random” debugging verbs; “showobj”, “tree”, “showverb”, “scope”;
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keeping watch of “actions”, “changes”, “messages”, “timers”; tracing
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the parser with “trace”; supernatural ability to “purloin”, “abstract”,
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“goto”, “gonear”; the Infix “; ”, “;give”, “;move”, “;remove”, “;examine”,
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“;watch”, “;inventory”; marking routines with a * to be watched.</p>
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<h3><a href="ch3.html">Chapter III:</a> The Model World</h3>
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<p class="section_header"><a href="s8.html">§8</a> Places and scenery</p>
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<p class="section_detail">The Square Chamber of ‘Ruins’; what “you don't need to refer to”; <code>static</code>
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and <code>scenery</code> objects; spreading mist with <code>found_in</code>; α Canis Minoris; the
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five senses and reaction rules; rooms have <code>before</code> and <code>after</code> too.</p>
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<p class="section_header"><a href="s9.html">§9</a> Directions and the map</p>
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<p class="section_detail">Giving ‘Ruins’ a small map; <code>n_to</code>, <code>d_to</code>, etc.; when you <code>cant_go</code>; direction
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objects in the <code>compass</code>; not the same as direction properties.</p>
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<p class="section_header"><a href="s10.html">§10</a> Food and drink</p>
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<p class="section_detail"><code>edible</code> foodstuffs; the <code>Drink</code> action; difficulties with liquids.</p>
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<p class="section_header"><a href="s11.html">§11</a> Clothing</p>
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<p class="section_detail"><code>Wear</code> and <code>Disrobe</code>; <code>wearable</code> items of clothing; a jade face mask.</p>
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<p class="section_header"><a href="s12.html">§12</a> Containers, supporters and sub-objects</p>
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<p class="section_detail">Containers: <code>container</code>, <code>supporter</code>, <code>capacity</code>, <code>open</code>, <code>openable</code>; locks and
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keys: <code>locked</code>, <code>lockable</code>, <code>with_key</code>; <code>LetGo</code> and <code>Receive</code> to trap use of a
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container: a chasm; transparency and component parts.</p>
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<p class="section_header"><a href="s13.html">§13</a> Doors</p>
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<p class="section_detail">How to create a <code>door</code>;
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<code>door_to</code>, <code>door_dir</code>; <code>when_open</code>,
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<code>when_closed</code>; a stone door for ‘Ruins’; a
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two-way door, the ‘Advent’ grate; why <code>door_dir</code> is
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needed and how to trap every attempt to go through.</p>
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<p class="section_header"><a href="s14">§14</a> Switchable objects</p>
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<p class="section_detail"><code>switchable</code> and <code>on</code>:
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<code>when_on</code>, <code>when_off</code>; the Gotham City searchlight;
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a sodium lamp; <code>describe</code> taking precedence.</p>
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<p class="section_header"><a href="s15">§15</a> Things to enter, travel in and push around</p>
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<p class="section_detail"><code>enterable</code> objects: a slab altar;
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vehicles: KAR 1; special rule about the <code>Go</code> action when
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inside something <code>enterable</code>; the <code>PushDir</code>
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action: a huge pumice-stone ball; pushing up and down.</p>
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<p class="section_header"><a href="s16.html">§16</a> Reading matter and consultation</p>
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<p class="section_detail">The <code>Consult</code> action, “look
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up”; <code>consult_from</code> and <code>consult_words</code>:
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a dictionary of glyphs, Tyndale's Bible; making “read”
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and “examine” different.</p>
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<p class="section_header"><a href="s17.html">§17</a> People and animals</p>
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<p class="section_detail"><code>animate</code> objects and the <code>life</code>
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rule; a coiled snake and a mummified priest; Blofeld's reactions;
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<code>talkable</code> objects; some people are <code>transparent</code>.</p>
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<p class="section_header"><a href="s18.html">§18</a> Making conversation</p>
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<p class="section_detail">Orders are actions for other people;
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giving people their own grammars; untypeable verbs; several
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voice-activated machines; fake fake actions; telephony.</p>
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<p class="section_header"><a href="s19.html">§19</a> The light and the dark</p>
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<p class="section_detail">Light versus darkness is automatic; modifying
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the darkness; going from dark into dark and the <code>DarkToDark</code>
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entry point; rules on ‘when there is light’.</p>
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<p class="section_header"><a href="s20.html">§20</a> Daemons and the passing
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<p class="section_detail">Daemons and the <code>daemon</code> property;
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starting and stopping them; background daemons; timers (fuses);
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<code>time_left</code> and <code>time_out</code>; <code>each_turn</code>
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events for places and nearby objects; the time of day; changing it
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with <code>SetTime</code>; on the status line; midnight, sunrise, sunset;
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the exact sequence of events at end-of-turn.</p>
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<p class="section_header"><a href="s21.html">§21</a> Starting, moving, changing
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and killing the player</p>
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<p class="section_detail">What <code>Initialise</code> should do;
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the <code>location</code>; <code>initial</code> restoration;
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teleportation and the <code>PlayerTo</code> routine; what happens
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when the room changes: <code>NewRoom</code>, <code>initial</code>
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for a room, <code>visited</code>; giving the player his own <code>before</code>
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rule; using <code>ChangePlayer</code> to transform him into any object;
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multi-character games; <code>life</code> and <code>deadflag</code>;
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the <code>DeathMessage</code> routine; resurrection and the <code>AfterLife</code>.</p>
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<p class="section_header"><a href="s22.html">§22</a> Miscellaneous constants,
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scoring, quotations</p>
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<p class="section_detail"><code>Story</code> and <code>Headline</code>;
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<code>MAX_CARRIED</code>; the automatic “sack object”;
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‘amusing’ rewards for the victorious; two scoring systems:
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for places and items, or for completing tasks; rankings and <code>PrintRank</code>;
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automatic score notification and <code>notify_mode</code>; “objects”
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and “places” verbs, removable with <code>NO_PLACES</code>;
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boxed quotations.</p>
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<p class="section_header"><a href="s23.html">§23</a> ‘Ruins’ revisited</p>
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<p class="section_detail">Further examples to complete ‘Ruins’;
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a map and a step by step solution of the final game.</p>
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<p class="section_header"><a href="s24.html">§24</a> The world model described</p>
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<p class="section_detail">¶1. Substance –
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¶2. Containment – ¶3. Space – ¶4. Sense –
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¶5. Time – ¶6. Action.</p>
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<p class="section_header"><a href="s25.html">§25</a> Extending and redefining the world model</p>
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<p class="section_detail">Enriching the model; Egyptian amulets and
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their spells; making a new library file; the <code>LibraryMessages</code>
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system for changing messages like “Dropped.”; changing
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the prompt; the last resort of <code>Replace</code> directives; using
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the world model description; fire and flammability.</p>
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<h3><a href="ch4.html">Chapter IV</a>: Describing and Parsing</h3>
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<p class="section_header"><a href="s26.html">§26</a> Describing objects and rooms</p>
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<p class="section_detail"><code>print (The) obj, ... (the) obj</code> and
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so on; indefinite and definite <code>article</code>; <code>proper</code>
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nouns; the <code>short_name</code> of an object; <code>invent</code>
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strings and routines; exactly how inventory lines are printed; a matchbook;
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<code>describe</code> routines; exactly how rooms
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are described; <code>Locale</code>.</p>
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<p class="section_header"><a href="s27.html">§27</a> Listing and grouping objects</p>
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<p class="section_detail">The list-maker <code>WriteListFrom</code>; its style
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bitmap; examples: tall and wide inventories; grouping similar items
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together in lists: foodstuffs, Scrabble pieces and denominations
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<p class="section_header"><a href="s28.html">§28</a> How nouns are parsed</p>
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<p class="section_detail">How <code>name</code> is used; a fried green tomato
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turning red; the parser breaks text into a stream of words;
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<code>wn</code> and <code>NextWord</code>; reading words as numbers or from their
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raw text; a <code>parse_name</code> routine is much more flexible than <code>name</code>;
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the <code>ParseNoun</code> entry point; distinguishing adjectives from nouns.</p>
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<p class="section_header"><a href="s29.html">§29</a> Plural names for duplicated objects</p>
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<p class="section_detail">Collections of indistinguishable objects;
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a bag of six coins; the <code>plural</code> property for printing out plurals;
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definition of ‘indistinguishable’; writing <code>parse_name</code>
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routines to allow plurals to be understood; class of crowns.</p>
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<p class="section_header"><a href="s30.html">§30</a> How verbs are parsed</p>
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<p class="section_detail">The parser's fundamental method; <code>BeforeParsing</code>
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entry point; the actor and verb word; synonyms for verbs; definitions
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of grammar, line and token; <code>action_to_be</code>; <code>Verb</code> directive: a
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simplified “take” grammar; <code>meta</code> verbs; grammar creates
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actions; creating an “xyzzy” verb; how to <code>Extend</code> grammar
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for an existing verb: pushing numbered buttons; priority: <code>replace</code>,
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<code>first</code>, <code>last</code>; splitting synonymous verbs apart with <code>Extend only</code>;
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the <code>UnknownVerb</code> and <code>PrintVerb</code> entry points.</p>
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<p class="section_header"><a href="s31.html">§31</a> Tokens of grammar</p>
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<p class="section_detail">Full list of grammar tokens; prepositions;
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<code>noun</code> and <code>held</code>; implicit taking; tokens allowing multiple objects
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like “all”; filtering out nouns by attribute:
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“use” verb; and by general routine: “free”
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verb; parsing numbers: “type” verb, <code>ParseNumber</code>;
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general parsing routines; reading from the parser's raw text
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<code>buffer</code> and <code>parse</code> table; exercises, including French, telephone
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and floating-point numbers, times of day, adding a <code>third</code> parameter
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to a grammar line.</p>
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<p class="section_header"><a href="s32.html">§32</a> Scope and what you can see</p>
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<p class="section_detail">The definition of ‘in scope’;
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touchability is stricter than scope; answering questions:
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“what is a grue”; <code>scope=...</code> tokens with programmable
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scope; <code>scope_stage</code>, <code>ScopeWithin</code> and <code>PlaceInScope</code>; changing
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the global definition of ‘in scope’ using <code>InScope</code>;
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<code>scope_reason</code>; looping over and testing scope; making the rules
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more sensitive to darkness; a long room divided by a glass
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wall; the <code>add_to_scope</code> property for component parts of containers.</p>
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<p class="section_header"><a href="s33.html">§33</a> Helping the parser out of trouble</p>
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<p class="section_detail">Parser error messages and <code>ParserError</code>;
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ambiguity-resolution and influencing it with <code>ChooseObjects</code>; making
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“eat” prefer <code>edible</code> objects; redefining “all”;
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exactly how ambiguities are resolved.</p>
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<h3><a href="ch5.html">Chapter V</a>: Natural Language</h3>
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<p class="section_header"><a href="s34.html">§34</a> Linguistics and the Inform parser</p>
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<p class="section_detail">¡Bienvenido a Aventura!; Informese;
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commands, verb phrases, prepositions, noun phrases, gender-number-animation
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(GNA), descriptors, nouns, pronouns; example of parsing; grammatical
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features not present in Informese.</p>
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<p class="section_header"><a href="s35.html">§35</a> Case and parsing noun phrases</p>
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<p class="section_detail">Flexion and cases; parsing inflected
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noun phrases; for example, Old English dative word-endings.</p>
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<p class="section_header"><a href="s36.html">§36</a> Parsing non-English languages</p>
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<p class="section_detail">Compromises; accented characters at the
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keyboard?; dialects; language definition files; <code>Zcharacter</code> and
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the customisation of ZSCII; specifying pronouns and descriptors;
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translating natural languages to Informese.</p>
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<p class="section_header"><a href="s37.html">§37</a> Names and messages in non-English languages</p>
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<p class="section_detail">Gender-number-animation of short names;
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agreement with articles and cases; contraction forms and articles;
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library messages of all kinds.</p>
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<h3><a href="ch6.html">Chapter VI</a>: Using the Compiler</h3>
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<p class="section_header"><a href="s38.html">§38</a> Controlling compilation from within</p>
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<p class="section_detail"><code>Include</code>; conditional compilation: <code>If...</code>,
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<code>Ifnot</code>, <code>Endif</code>; <code>Message</code>; linking in the library; writing new modules
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to link in; serial and release numbers.</p>
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<p class="section_header"><a href="s39.html">§39</a> Controlling compilation from without</p>
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<p class="section_detail">Switches; memory settings; pathname variables;
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Inform Control Language (ICL).</p>
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<p class="section_header"><a href="s40.html">§40</a> All the Inform error messages</p>
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<p class="section_detail">Fatal errors; errors, including linker and
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assembler errors; warnings, including obsolete usage warnings.</p>
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<h3><a href="ch7.html">Chapter VII</a>: The Z-Machine</h3>
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<p class="section_header"><a href="s41.html">§41</a> Architecture and assembly</p>
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<p class="section_detail">ZIL, Inform and the Z-machine; its Versions;
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assembly language; store and branch opcodes, labels; memory map and
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<p class="section_header"><a href="s42.html">§42</a> Devices and opcodes</p>
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<p class="section_detail">The Standard for interpreters; input and
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output streams; the Version 5 and Version 6 screen models; colours,
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windows and status lines; interrupt countdowns; pictures; sounds;
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keyboard reading with timed interrupts; terminating characters; the
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mouse; menus; loading and saving auxiliary files; throwing and
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catching stack frames.</p>
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<p class="section_header"><a href="s43.html">§43</a> Pictures, sounds, blurbs and Blorb</p>
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<p class="section_detail">What a Blorb file is; the perlBlorb utility
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program; blurb files; palette, resolution, scaling; specifying what
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sounds and pictures belong to a story file.</p>
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<p class="section_header"><a href="s44.html">§44</a> Case study: a library file for menus</p>
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<p class="section_detail">Invisiclues; basic design; the <code>Option</code> class;
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the <code>Menu</code> class; the <code>SwitchOption</code> class.</p>
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<p class="section_header"><a href="s45.html">§45</a> Limitations and getting around them</p>
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<p class="section_detail">Story file size; readable memory size; grammar;
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vocabulary; dictionary resolution; objects, attributes, properties, names;
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function and message arguments; recursion and stack usage; abbreviations
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<h3><a href="ch8.html">Chapter VIII</a>: The Craft of Adventure</h3>
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<p class="section_header"><a href="s46.html">§46</a>
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A brief history of interactive fiction</p>
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<ul class="section_detail">
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<li><a href="s46.html#s46_1">§46.1.</a>
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Precursors and university games 1972–81</li>
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<li><a href="s46.html#s46_2">§46.2.</a>
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The commercial boom 1982–6</li>
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<li><a href="s46.html#s46_3">§46.3.</a>
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The growth of a community c. 1985–91</li>
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<li><a href="s46.html#s46_4">§46.4.</a>
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Newsgroups and revival 1992–</li>
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<p class="section_header"><a href="s47.html">§47</a>
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Realities and origins</p>
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<p class="section_detail">Fictional backgrounds; crimes against mimesis;
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historical research; book adaptations.</p>
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<p class="section_header"><a href="s48.html">§48</a>
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A triangle of identities</p>
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<p class="section_detail">Player, protagonist and narrator; participatory
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magic; the overture and other narrated text.</p>
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<p class="section_header"><a href="s49.html">§49</a>
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<p class="section_detail">Size and density; the prologue, middle game and end
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game; wide versus narrow; lattice diagrams, including one for
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‘Ruins’.</p>
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<p class="section_header"><a href="s50.html">§50</a>
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The design of puzzles</p>
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<p class="section_detail">General remarks on good and bad puzzles; mazes, light
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sources, capacity and exhaustion, timed puzzles, utility objects,
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keys and doors, machinery and vehicles, fire, water, air, earth,
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plants, animals, monsters, people, ropes and chains, riddles,
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decipherment puzzles; clues, luck and accidental solutions;
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optional and multiple solutions; rewards.</p>
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<p class="section_header"><a href="s51.html">§51</a>
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The room description</p>
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<p class="section_detail">Examples of good, mediocre and poor description; how
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much space is one location?; variable descriptions; outdoor games;
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differing perspectives.</p>
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<p class="section_header"><a href="s52.html">§52</a>
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<p class="section_detail">Scoring systems; responding to wrong guesses; examples
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of typical bugs; play-testing and editing; concluding homily.</p>
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<p class="section_header">APPENDICES</p>
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<ul class="section_detail">
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<li><a href="sa1.html">§A1</a> Library attributes</li>
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<li><a href="sa2.html">§A2</a> Library properties</li>
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<li><a href="sa3.html">§A3</a> Library routines</li>
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<li><a href="sa4.html">§A4</a> Library message numbers</li>
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<li><a href="sa5.html">§A5</a> Entry point routines</li>
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<li><a href="sa6.html">§A6</a> Answers to all the exercises</li>
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<p class="section_header">TABLES</p>
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<ul class="section_detail">
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<li><a href="tables.html#tbl1a">Table 1</a> Operators</li>
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<li><a href="tables.html#tbl2a">Table 2</a> The ZSCII Character Set</li>
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<li><a href="tables.html#tbl3">Table 3</a> Command Line Switches</li>
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<li><a href="tables.html#tbl4">Table 4</a> Statements</li>
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<li><a href="tables.html#tbl5">Table 5</a> Directives</li>
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<li><a href="tables.html#tbl6a">Table 6</a> Library actions</li>
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<p class="section_header">INDEX</p>
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<ul class="section_detail">
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<li><a href="cited.html">Cited Works of Interactive Fiction</a></li>
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<li><a href="exdm4index.html">Index of Exercises</a></li>
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<li><a href="dm4index.html">General Index</a></li>
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<p class="section_header" style="margin-bottom:1em"><a href="colophon.html">Colophon</a><br>
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<a href="colophon.html#ld">Long Descriptions of Selected Images</a><br>
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<a href="backcover.html">Back Cover</a></p>
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<a href="index.html">home</a> /
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<a href="index.html">prev</a> /
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<a href="intro.html" title="Introduction">next</a> /
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<a href="dm4index.html">index</a>
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