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keiravillekodekeiravillekode
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Add proverb exercise (#296)
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‎config.json

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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "bottle-song",
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"name": "Bottle Song",
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"uuid": "b6d90e4b-9f17-459b-aff3-2716e49ccb9c",
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"practices": [],
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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "diamond",
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"name": "Diamond",
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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "proverb",
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"name": "Proverb",
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"uuid": "c4bb45c9-9c9d-4a56-933b-df7aa2d45945",
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"practices": [],
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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "raindrops",
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"name": "Raindrops",
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"practices": [],
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"prerequisites": [],
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"difficulty": 10
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},
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{
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"slug": "bottle-song",
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"name": "Bottle Song",
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"uuid": "b6d90e4b-9f17-459b-aff3-2716e49ccb9c",
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"practices": [],
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"prerequisites": [],
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"difficulty": 5
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}
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],
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"foregone": [

‎exercises/practice/proverb/.docs/hints.md

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# Hints
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## General
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- The `$t0-9` registers can be used to temporarily store values
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- The instructions specify which registers are used as input and output

‎exercises/practice/proverb/.docs/instructions.append.md

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# Instructions append
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## Input format
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Each list of inputs is represented as a null-terminated string, with a newline character at the end of each input.
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An example would be `"nail\nshoe\nhorse\nrider\nmessage\nbattle\nkingdom\n"`
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## Registers
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| Register | Usage | Type | Description |
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| -------- | ------------ | ------- | -------------------------------------------------------------- |
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| `$a0` | input | address | null-terminated input string with newline after each input |
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| `$a1` | input/output | address | null-terminated output string |
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| `$t0-9` | temporary | any | for temporary storage |

‎exercises/practice/proverb/.docs/instructions.md

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# Instructions
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For want of a horseshoe nail, a kingdom was lost, or so the saying goes.
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Given a list of inputs, generate the relevant proverb.
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For example, given the list `["nail", "shoe", "horse", "rider", "message", "battle", "kingdom"]`, you will output the full text of this proverbial rhyme:
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```text
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For want of a nail the shoe was lost.
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For want of a shoe the horse was lost.
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For want of a horse the rider was lost.
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For want of a rider the message was lost.
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For want of a message the battle was lost.
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For want of a battle the kingdom was lost.
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And all for the want of a nail.
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```
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Note that the list of inputs may vary; your solution should be able to handle lists of arbitrary length and content.
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No line of the output text should be a static, unchanging string; all should vary according to the input given.

‎exercises/practice/proverb/.meta/config.json

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{
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"authors": [
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"keiravillekode"
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],
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"files": {
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"solution": [
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"impl.mips"
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],
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"test": [
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"runner.mips"
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],
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"example": [
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".meta/example.mips"
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]
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},
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"blurb": "For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.",
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"source": "Wikipedia",
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"source_url": "https://en.wikipedia.org/wiki/For_Want_of_a_Nail"
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}

‎exercises/practice/proverb/.meta/example.mips

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# | Register | Usage | Type | Description |
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# | -------- | ------------ | ------- | ---------------------------------------------------------- |
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# | `$a0` | input | address | null-terminated input string with newline after each input |
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# | `$a1` | input/output | address | null-terminated output string |
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# | `$a2` | temporary | address | null-terminated or newline-terminated source string |
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# | `$t0` | temporary | byte | character for output |
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# | `$t6` | temporary | address | current string |
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# | `$t7` | temporary | address | first string |
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# | `$t8` | temporary | byte | '\n' newline |
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# | `$t9` | temporary | address | return address |
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.globl recite
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.data
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for_want: .asciiz "For want of a "
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the: .asciiz " the "
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was_lost: .asciiz " was lost.\n"
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and_all: .asciiz "And all for the want of a "
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stop: .asciiz ".\n"
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.text
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recite:
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move $t7, $a0 # first string
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li $t8, '\n'
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move $t9, $ra # Save return address
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j next
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write_line:
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la $a2, for_want
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jal copy_string
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move $a2, $t6
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jal copy_line
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la $a2, the
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jal copy_string
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move $a2, $a0
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jal copy_line
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la $a2, was_lost
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jal copy_string
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next:
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move $t6, $a0 # current string
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scan:
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lb $t0, 0($a0) # read input byte
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addi $a0, $a0, 1 # increment input pointer
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bne $t0, $t8, scan # loop until newline
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lb $t0, 0($a0) # first byte after newline
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bnez $t0, write_line
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write_final_line:
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la $a2, and_all
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jal copy_string
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move $a2, $t7 # first string
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jal copy_line
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la $a2, stop
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jal copy_string
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jr $t9
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copy_string:
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# copy string from source $a2 to destination $a1
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lb $t0, 0($a2) # load source byte
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sb $t0, 0($a1) # write byte to destination
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addi $a2, $a2, 1 # increment souce pointer
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addi $a1, $a1, 1 # increment destination pointer
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bnez $t0, copy_string # repeat until we have reached null terminator
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subi $a1, $a1, 1 # decrement destination pointer,
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# ready to append other strings
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jr $ra
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copy_line:
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# copy line from source $a2 to destination $a1
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# assume $t8 is '\n'
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lb $t0, 0($a2) # load source byte
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sb $t0, 0($a1) # write byte to destination
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addi $a2, $a2, 1 # increment souce pointer
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addi $a1, $a1, 1 # increment destination pointer
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bne $t0, $t8, copy_line # repeat until we have reached '\n' line terminator
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subi $a1, $a1, 1 # decrement destination pointer,
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# ready to append other strings
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jr $ra

‎exercises/practice/proverb/.meta/tests.toml

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[e974b73e-7851-484f-8d6d-92e07fe742fc]
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description = "zero pieces"
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include = false
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[2fcd5f5e-8b82-4e74-b51d-df28a5e0faa4]
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description = "one piece"
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[d9d0a8a1-d933-46e2-aa94-eecf679f4b0e]
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description = "two pieces"
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[c95ef757-5e94-4f0d-a6cb-d2083f5e5a83]
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description = "three pieces"
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[433fb91c-35a2-4d41-aeab-4de1e82b2126]
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description = "full proverb"
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[c1eefa5a-e8d9-41c7-91d4-99fab6d6b9f7]
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description = "four pieces modernized"

‎exercises/practice/proverb/impl.mips

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# | Register | Usage | Type | Description |
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# | -------- | ------------ | ------- | ---------------------------------------------------------- |
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# | `$a0` | input | address | null-terminated input string with newline after each input |
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# | `$a1` | input/output | address | null-terminated output string |
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# | `$t0-9` | temporary | any | for temporary storage |
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.globl recite
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recite:
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jr $ra

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