An expression parser (small DSL) written in C (github.com)

submitted 3 weeks ago by armchair_progamer@programming.dev to c/programming_languages@programming.dev

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Key Features

Multiple types (number, bool, datetime, string and error)

Memory managed by user (no allocs)

Iterator based interface

Supporting variables

Stateless

Expressions can be compiled (RPN stack)

Fully compile-time checked syntax

Documented grammar

Standard C11 code

No dependencies

Examples
# Numerical calculations
sin((-1 + 2) * PI)

# Dates
datetrunc(now(), "day")

# Strings
"hi " + upper("bob")  + trim("  !  ")

# Conditionals
ifelse(1 < 5 && length($alphabet) > 25, "case1", "case2")

# Find the missing letter
replace($alphabet, substr($alphabet, 25 - random(0, length($alphabet)), 1), "")

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this post was submitted on 24 Sep 2024

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Programming Languages

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